From 8ed6207b5cec628cb51a807a0a585f129de2e041 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 4 Aug 2020 23:33:35 +0200
Subject: update honggfuzz custom mutator. make update is all it takes to stay
 current :)

---
 custom_mutators/honggfuzz/Makefile    |   2 +
 custom_mutators/honggfuzz/honggfuzz.h | 561 +++++++++++++++-------------------
 custom_mutators/honggfuzz/mangle.c    |  34 +--
 custom_mutators/honggfuzz/mangle.h    |   3 +-
 4 files changed, 262 insertions(+), 338 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/Makefile b/custom_mutators/honggfuzz/Makefile
index 2f46d0e7..1d46f163 100644
--- a/custom_mutators/honggfuzz/Makefile
+++ b/custom_mutators/honggfuzz/Makefile
@@ -7,6 +7,8 @@ honggfuzz.so:	honggfuzz.c input.h mangle.c ../../src/afl-performance.c
 	$(CC) $(CFLAGS) -I../../include -I. -shared -o honggfuzz.so honggfuzz.c mangle.c ../../src/afl-performance.c
 
 update:
+	@# seriously? --unlink is a dud option? sigh ...
+	rm -f mangle.c mangle.h honggfuzz.h
 	wget --unlink https://github.com/google/honggfuzz/raw/master/mangle.c
 	wget --unlink https://github.com/google/honggfuzz/raw/master/mangle.h
 	wget --unlink https://github.com/google/honggfuzz/raw/master/honggfuzz.h
diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
index 4e045272..9d07fdf4 100644
--- a/custom_mutators/honggfuzz/honggfuzz.h
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -38,18 +38,17 @@
 
 #include "libhfcommon/util.h"
 
-#define PROG_NAME "honggfuzz"
-#define PROG_VERSION "2.2"
+#define PROG_NAME    "honggfuzz"
+#define PROG_VERSION "2.3"
 
-/* Name of the template which will be replaced with the proper name of the file
- */
+/* Name of the template which will be replaced with the proper name of the file */
 #define _HF_FILE_PLACEHOLDER "___FILE___"
 
 /* Default name of the report created with some architectures */
 #define _HF_REPORT_FILE "HONGGFUZZ.REPORT.TXT"
 
 /* Default stack-size of created threads. */
-#define _HF_PTHREAD_STACKSIZE (1024ULL * 1024ULL * 2ULL)             /* 2MB */
+#define _HF_PTHREAD_STACKSIZE (1024ULL * 1024ULL * 2ULL) /* 2MB */
 
 /* Name of envvar which indicates sequential number of fuzzer */
 #define _HF_THREAD_NO_ENV "HFUZZ_THREAD_NO"
@@ -63,12 +62,11 @@
 /* Number of crash verifier iterations before tag crash as stable */
 #define _HF_VERIFIER_ITER 5
 
-/* Size (in bytes) for report data to be stored in stack before written to file
- */
+/* Size (in bytes) for report data to be stored in stack before written to file */
 #define _HF_REPORT_SIZE 32768
 
 /* Perf bitmap size */
-#define _HF_PERF_BITMAP_SIZE_16M (1024U * 1024U * 16U)
+#define _HF_PERF_BITMAP_SIZE_16M   (1024U * 1024U * 16U)
 #define _HF_PERF_BITMAP_BITSZ_MASK 0x7FFFFFFULL
 /* Maximum number of PC guards (=trace-pc-guard) we support */
 #define _HF_PC_GUARD_MAX (1024ULL * 1024ULL * 64ULL)
@@ -89,7 +87,7 @@
 #define _HF_INPUT_FD 1021
 /* FD used to pass coverage feedback from the fuzzed process */
 #define _HF_COV_BITMAP_FD 1022
-#define _HF_BITMAP_FD _HF_COV_BITMAP_FD   /* Old name for _HF_COV_BITMAP_FD */
+#define _HF_BITMAP_FD     _HF_COV_BITMAP_FD /* Old name for _HF_COV_BITMAP_FD */
 /* FD used to pass data to a persistent process */
 #define _HF_PERSISTENT_FD 1023
 
@@ -105,356 +103,283 @@ static const uint8_t HFReadyTag = 'R';
 /* Maximum number of active fuzzing threads */
 #define _HF_THREAD_MAX 1024U
 
-/* Persistent-binary signature - if found within file, it means it's a
- * persistent mode binary */
+/* Persistent-binary signature - if found within file, it means it's a persistent mode binary */
 #define _HF_PERSISTENT_SIG "\x01_LIBHFUZZ_PERSISTENT_BINARY_SIGNATURE_\x02\xFF"
-/* HF NetDriver signature - if found within file, it means it's a
- * NetDriver-based binary */
+/* HF NetDriver signature - if found within file, it means it's a NetDriver-based binary */
 #define _HF_NETDRIVER_SIG "\x01_LIBHFUZZ_NETDRIVER_BINARY_SIGNATURE_\x02\xFF"
 
-/* printf() nonmonetary separator. According to MacOSX's man it's supported
- * there as well */
+/* printf() nonmonetary separator. According to MacOSX's man it's supported there as well */
 #define _HF_NONMON_SEP "'"
 
 typedef enum {
-
-  _HF_DYNFILE_NONE = 0x0,
-  _HF_DYNFILE_INSTR_COUNT = 0x1,
-  _HF_DYNFILE_BRANCH_COUNT = 0x2,
-  _HF_DYNFILE_BTS_EDGE = 0x10,
-  _HF_DYNFILE_IPT_BLOCK = 0x20,
-  _HF_DYNFILE_SOFT = 0x40,
-
+    _HF_DYNFILE_NONE         = 0x0,
+    _HF_DYNFILE_INSTR_COUNT  = 0x1,
+    _HF_DYNFILE_BRANCH_COUNT = 0x2,
+    _HF_DYNFILE_BTS_EDGE     = 0x10,
+    _HF_DYNFILE_IPT_BLOCK    = 0x20,
+    _HF_DYNFILE_SOFT         = 0x40,
 } dynFileMethod_t;
 
 typedef struct {
-
-  uint64_t cpuInstrCnt;
-  uint64_t cpuBranchCnt;
-  uint64_t bbCnt;
-  uint64_t newBBCnt;
-  uint64_t softCntPc;
-  uint64_t softCntEdge;
-  uint64_t softCntCmp;
-
+    uint64_t cpuInstrCnt;
+    uint64_t cpuBranchCnt;
+    uint64_t bbCnt;
+    uint64_t newBBCnt;
+    uint64_t softCntPc;
+    uint64_t softCntEdge;
+    uint64_t softCntCmp;
 } hwcnt_t;
 
 typedef enum {
-
-  _HF_STATE_UNSET = 0,
-  _HF_STATE_STATIC,
-  _HF_STATE_DYNAMIC_DRY_RUN,
-  _HF_STATE_DYNAMIC_MAIN,
-  _HF_STATE_DYNAMIC_MINIMIZE,
-
+    _HF_STATE_UNSET = 0,
+    _HF_STATE_STATIC,
+    _HF_STATE_DYNAMIC_DRY_RUN,
+    _HF_STATE_DYNAMIC_MAIN,
+    _HF_STATE_DYNAMIC_MINIMIZE,
 } fuzzState_t;
 
 typedef enum {
-
-  HF_MAYBE = -1,
-  HF_NO = 0,
-  HF_YES = 1,
-
+    HF_MAYBE = -1,
+    HF_NO    = 0,
+    HF_YES   = 1,
 } tristate_t;
 
 struct _dynfile_t {
-
-  size_t             size;
-  uint64_t           cov[4];
-  size_t             idx;
-  int                fd;
-  uint64_t           timeExecUSecs;
-  char               path[PATH_MAX];
-  struct _dynfile_t *src;
-  uint32_t           refs;
-  uint8_t *          data;
-  TAILQ_ENTRY(_dynfile_t) pointers;
-
+    size_t             size;
+    uint64_t           cov[4];
+    size_t             idx;
+    int                fd;
+    uint64_t           timeExecUSecs;
+    char               path[PATH_MAX];
+    struct _dynfile_t* src;
+    uint32_t           refs;
+    uint8_t*           data;
+    TAILQ_ENTRY(_dynfile_t) pointers;
 };
 
 typedef struct _dynfile_t dynfile_t;
 
 struct strings_t {
-
-  size_t len;
-  TAILQ_ENTRY(strings_t) pointers;
-  char s[];
-
+    size_t len;
+    TAILQ_ENTRY(strings_t) pointers;
+    char s[];
 };
 
 typedef struct {
-
-  uint8_t  pcGuardMap[_HF_PC_GUARD_MAX];
-  uint8_t  bbMapPc[_HF_PERF_BITMAP_SIZE_16M];
-  uint32_t bbMapCmp[_HF_PERF_BITMAP_SIZE_16M];
-  uint64_t pidNewPC[_HF_THREAD_MAX];
-  uint64_t pidNewEdge[_HF_THREAD_MAX];
-  uint64_t pidNewCmp[_HF_THREAD_MAX];
-  uint64_t guardNb;
-  uint64_t pidTotalPC[_HF_THREAD_MAX];
-  uint64_t pidTotalEdge[_HF_THREAD_MAX];
-  uint64_t pidTotalCmp[_HF_THREAD_MAX];
-
+    uint8_t  pcGuardMap[_HF_PC_GUARD_MAX];
+    uint8_t  bbMapPc[_HF_PERF_BITMAP_SIZE_16M];
+    uint32_t bbMapCmp[_HF_PERF_BITMAP_SIZE_16M];
+    uint64_t pidNewPC[_HF_THREAD_MAX];
+    uint64_t pidNewEdge[_HF_THREAD_MAX];
+    uint64_t pidNewCmp[_HF_THREAD_MAX];
+    uint64_t guardNb;
+    uint64_t pidTotalPC[_HF_THREAD_MAX];
+    uint64_t pidTotalEdge[_HF_THREAD_MAX];
+    uint64_t pidTotalCmp[_HF_THREAD_MAX];
 } feedback_t;
 
 typedef struct {
-
-  uint32_t cnt;
-  struct {
-
-    uint8_t  val[32];
-    uint32_t len;
-
-  } valArr[1024 * 16];
-
+    uint32_t cnt;
+    struct {
+        uint8_t  val[32];
+        uint32_t len;
+    } valArr[1024 * 16];
 } cmpfeedback_t;
 
 typedef struct {
-
-  struct {
-
-    size_t    threadsMax;
-    size_t    threadsFinished;
-    uint32_t  threadsActiveCnt;
-    pthread_t mainThread;
-    pid_t     mainPid;
-    pthread_t threads[_HF_THREAD_MAX];
-
-  } threads;
-
-  struct {
-
-    const char *inputDir;
-    const char *outputDir;
-    DIR *       inputDirPtr;
-    size_t      fileCnt;
-    size_t      testedFileCnt;
-    const char *fileExtn;
-    size_t      maxFileSz;
-    size_t      newUnitsAdded;
-    char        workDir[PATH_MAX];
-    const char *crashDir;
-    const char *covDirNew;
-    bool        saveUnique;
-    size_t      dynfileqMaxSz;
-    size_t      dynfileqCnt;
-    dynfile_t * dynfileqCurrent;
-    dynfile_t * dynfileq2Current;
-    TAILQ_HEAD(dyns_t, _dynfile_t) dynfileq;
-    bool exportFeedback;
-
-  } io;
-
-  struct {
-
-    int                argc;
-    const char *const *cmdline;
-    bool               nullifyStdio;
-    bool               fuzzStdin;
-    const char *       externalCommand;
-    const char *       postExternalCommand;
-    const char *       feedbackMutateCommand;
-    bool               netDriver;
-    bool               persistent;
-    uint64_t           asLimit;
-    uint64_t           rssLimit;
-    uint64_t           dataLimit;
-    uint64_t           coreLimit;
-    uint64_t           stackLimit;
-    bool               clearEnv;
-    char *             env_ptrs[128];
-    char               env_vals[128][4096];
-    sigset_t           waitSigSet;
-
-  } exe;
-
-  struct {
-
-    time_t  timeStart;
-    time_t  runEndTime;
-    time_t  tmOut;
-    time_t  lastCovUpdate;
-    int64_t timeOfLongestUnitUSecs;
-    bool    tmoutVTALRM;
-
-  } timing;
-
-  struct {
-
     struct {
-
-      uint8_t val[256];
-      size_t  len;
-
-    } dictionary[1024];
-
-    size_t      dictionaryCnt;
-    const char *dictionaryFile;
-    size_t      mutationsMax;
-    unsigned    mutationsPerRun;
-    size_t      maxInputSz;
-
-  } mutate;
-
-  struct {
-
-    bool    useScreen;
-    char    cmdline_txt[65];
-    int64_t lastDisplayUSecs;
-
-  } display;
-
-  struct {
-
-    bool        useVerifier;
-    bool        exitUponCrash;
-    const char *reportFile;
-    size_t      dynFileIterExpire;
-    bool        only_printable;
-    bool        minimize;
-    bool        switchingToFDM;
-
-  } cfg;
-
-  struct {
-
-    bool enable;
-    bool del_report;
-
-  } sanitizer;
-
-  struct {
-
-    fuzzState_t     state;
-    feedback_t *    covFeedbackMap;
-    int             covFeedbackFd;
-    cmpfeedback_t * cmpFeedbackMap;
-    int             cmpFeedbackFd;
-    bool            cmpFeedback;
-    const char *    blacklistFile;
-    uint64_t *      blacklist;
-    size_t          blacklistCnt;
-    bool            skipFeedbackOnTimeout;
-    uint64_t        maxCov[4];
-    dynFileMethod_t dynFileMethod;
-    hwcnt_t         hwCnts;
-
-  } feedback;
-
-  struct {
-
-    size_t mutationsCnt;
-    size_t crashesCnt;
-    size_t uniqueCrashesCnt;
-    size_t verifiedCrashesCnt;
-    size_t blCrashesCnt;
-    size_t timeoutedCnt;
-
-  } cnts;
-
-  struct {
-
-    bool enabled;
-    int  serverSocket;
-    int  clientSocket;
-
-  } socketFuzzer;
-
-  struct {
-
-    pthread_rwlock_t dynfileq;
-    pthread_mutex_t  feedback;
-    pthread_mutex_t  report;
-    pthread_mutex_t  state;
-    pthread_mutex_t  input;
-    pthread_mutex_t  timing;
-
-  } mutex;
-
-  /* For the Linux code */
-  struct {
-
-    int         exeFd;
-    uint64_t    dynamicCutOffAddr;
-    bool        disableRandomization;
-    void *      ignoreAddr;
-    const char *symsBlFile;
-    char **     symsBl;
-    size_t      symsBlCnt;
-    const char *symsWlFile;
-    char **     symsWl;
-    size_t      symsWlCnt;
-    uintptr_t   cloneFlags;
-    tristate_t  useNetNs;
-    bool        kernelOnly;
-    bool        useClone;
-
-  } arch_linux;
-
-  /* For the NetBSD code */
-  struct {
-
-    void *      ignoreAddr;
-    const char *symsBlFile;
-    char **     symsBl;
-    size_t      symsBlCnt;
-    const char *symsWlFile;
-    char **     symsWl;
-    size_t      symsWlCnt;
-
-  } arch_netbsd;
-
+        size_t    threadsMax;
+        size_t    threadsFinished;
+        uint32_t  threadsActiveCnt;
+        pthread_t mainThread;
+        pid_t     mainPid;
+        pthread_t threads[_HF_THREAD_MAX];
+    } threads;
+    struct {
+        const char* inputDir;
+        const char* outputDir;
+        DIR*        inputDirPtr;
+        size_t      fileCnt;
+        size_t      testedFileCnt;
+        const char* fileExtn;
+        size_t      maxFileSz;
+        size_t      newUnitsAdded;
+        char        workDir[PATH_MAX];
+        const char* crashDir;
+        const char* covDirNew;
+        bool        saveUnique;
+        size_t      dynfileqMaxSz;
+        size_t      dynfileqCnt;
+        dynfile_t*  dynfileqCurrent;
+        dynfile_t*  dynfileq2Current;
+        TAILQ_HEAD(dyns_t, _dynfile_t) dynfileq;
+        bool exportFeedback;
+    } io;
+    struct {
+        int                argc;
+        const char* const* cmdline;
+        bool               nullifyStdio;
+        bool               fuzzStdin;
+        const char*        externalCommand;
+        const char*        postExternalCommand;
+        const char*        feedbackMutateCommand;
+        bool               netDriver;
+        bool               persistent;
+        uint64_t           asLimit;
+        uint64_t           rssLimit;
+        uint64_t           dataLimit;
+        uint64_t           coreLimit;
+        uint64_t           stackLimit;
+        bool               clearEnv;
+        char*              env_ptrs[128];
+        char               env_vals[128][4096];
+        sigset_t           waitSigSet;
+    } exe;
+    struct {
+        time_t  timeStart;
+        time_t  runEndTime;
+        time_t  tmOut;
+        time_t  lastCovUpdate;
+        int64_t timeOfLongestUnitUSecs;
+        bool    tmoutVTALRM;
+    } timing;
+    struct {
+        struct {
+            uint8_t val[256];
+            size_t  len;
+        } dictionary[1024];
+        size_t      dictionaryCnt;
+        const char* dictionaryFile;
+        size_t      mutationsMax;
+        unsigned    mutationsPerRun;
+        size_t      maxInputSz;
+    } mutate;
+    struct {
+        bool    useScreen;
+        char    cmdline_txt[65];
+        int64_t lastDisplayUSecs;
+    } display;
+    struct {
+        bool        useVerifier;
+        bool        exitUponCrash;
+        const char* reportFile;
+        size_t      dynFileIterExpire;
+        bool        only_printable;
+        bool        minimize;
+        bool        switchingToFDM;
+    } cfg;
+    struct {
+        bool enable;
+        bool del_report;
+    } sanitizer;
+    struct {
+        fuzzState_t     state;
+        feedback_t*     covFeedbackMap;
+        int             covFeedbackFd;
+        cmpfeedback_t*  cmpFeedbackMap;
+        int             cmpFeedbackFd;
+        bool            cmpFeedback;
+        const char*     blacklistFile;
+        uint64_t*       blacklist;
+        size_t          blacklistCnt;
+        bool            skipFeedbackOnTimeout;
+        uint64_t        maxCov[4];
+        dynFileMethod_t dynFileMethod;
+        hwcnt_t         hwCnts;
+    } feedback;
+    struct {
+        size_t mutationsCnt;
+        size_t crashesCnt;
+        size_t uniqueCrashesCnt;
+        size_t verifiedCrashesCnt;
+        size_t blCrashesCnt;
+        size_t timeoutedCnt;
+    } cnts;
+    struct {
+        bool enabled;
+        int  serverSocket;
+        int  clientSocket;
+    } socketFuzzer;
+    struct {
+        pthread_rwlock_t dynfileq;
+        pthread_mutex_t  feedback;
+        pthread_mutex_t  report;
+        pthread_mutex_t  state;
+        pthread_mutex_t  input;
+        pthread_mutex_t  timing;
+    } mutex;
+
+    /* For the Linux code */
+    struct {
+        int         exeFd;
+        uint64_t    dynamicCutOffAddr;
+        bool        disableRandomization;
+        void*       ignoreAddr;
+        const char* symsBlFile;
+        char**      symsBl;
+        size_t      symsBlCnt;
+        const char* symsWlFile;
+        char**      symsWl;
+        size_t      symsWlCnt;
+        uintptr_t   cloneFlags;
+        tristate_t  useNetNs;
+        bool        kernelOnly;
+        bool        useClone;
+    } arch_linux;
+    /* For the NetBSD code */
+    struct {
+        void*       ignoreAddr;
+        const char* symsBlFile;
+        char**      symsBl;
+        size_t      symsBlCnt;
+        const char* symsWlFile;
+        char**      symsWl;
+        size_t      symsWlCnt;
+    } arch_netbsd;
 } honggfuzz_t;
 
 typedef enum {
-
-  _HF_RS_UNKNOWN = 0,
-  _HF_RS_WAITING_FOR_INITIAL_READY = 1,
-  _HF_RS_WAITING_FOR_READY = 2,
-  _HF_RS_SEND_DATA = 3,
-
+    _HF_RS_UNKNOWN                   = 0,
+    _HF_RS_WAITING_FOR_INITIAL_READY = 1,
+    _HF_RS_WAITING_FOR_READY         = 2,
+    _HF_RS_SEND_DATA                 = 3,
 } runState_t;
 
 typedef struct {
-
-  honggfuzz_t *global;
-  pid_t        pid;
-  int64_t      timeStartedUSecs;
-  char         crashFileName[PATH_MAX];
-  uint64_t     pc;
-  uint64_t     backtrace;
-  uint64_t     access;
-  int          exception;
-  char         report[_HF_REPORT_SIZE];
-  bool         mainWorker;
-  unsigned     mutationsPerRun;
-  dynfile_t *  dynfile;
-  bool         staticFileTryMore;
-  uint32_t     fuzzNo;
-  int          persistentSock;
-  runState_t   runState;
-  bool         tmOutSignaled;
-  char *       args[_HF_ARGS_MAX + 1];
-  int          perThreadCovFeedbackFd;
-  unsigned     triesLeft;
-  dynfile_t *  current;
+    honggfuzz_t* global;
+    pid_t        pid;
+    int64_t      timeStartedUSecs;
+    char         crashFileName[PATH_MAX];
+    uint64_t     pc;
+    uint64_t     backtrace;
+    uint64_t     access;
+    int          exception;
+    char         report[_HF_REPORT_SIZE];
+    bool         mainWorker;
+    unsigned     mutationsPerRun;
+    dynfile_t*   dynfile;
+    bool         staticFileTryMore;
+    uint32_t     fuzzNo;
+    int          persistentSock;
+    runState_t   runState;
+    bool         tmOutSignaled;
+    char*        args[_HF_ARGS_MAX + 1];
+    int          perThreadCovFeedbackFd;
+    unsigned     triesLeft;
+    dynfile_t*   current;
 #if !defined(_HF_ARCH_DARWIN)
-  timer_t timerId;
-#endif  // !defined(_HF_ARCH_DARWIN)
-  hwcnt_t hwCnts;
-
-  struct {
-
-    /* For Linux code */
-    uint8_t *perfMmapBuf;
-    uint8_t *perfMmapAux;
-    int      cpuInstrFd;
-    int      cpuBranchFd;
-    int      cpuIptBtsFd;
-
-  } arch_linux;
+    timer_t timerId;
+#endif    // !defined(_HF_ARCH_DARWIN)
+    hwcnt_t hwCnts;
 
+    struct {
+        /* For Linux code */
+        uint8_t* perfMmapBuf;
+        uint8_t* perfMmapAux;
+        int      cpuInstrFd;
+        int      cpuBranchFd;
+        int      cpuIptBtsFd;
+    } arch_linux;
 } run_t;
 
 #endif
-
diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index 05e0dcfa..c2988319 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -51,7 +51,7 @@ static inline size_t mangle_LenLeft(run_t *run, size_t off) {
 
 }
 
-/* Get a random value between <1:max> with x^2 distribution */
+/* Get a random value <1:max>, but prefer smaller ones - up to 4KiB */
 static inline size_t mangle_getLen(size_t max) {
 
   if (max > _HF_INPUT_MAX_SIZE) {
@@ -64,27 +64,25 @@ static inline size_t mangle_getLen(size_t max) {
   if (max == 0) { LOG_F("max == 0"); }
   if (max == 1) { return 1; }
 
-  const uint64_t max2 = (uint64_t)max * max;
-  const uint64_t max3 = (uint64_t)max * max * max;
-  const uint64_t rnd = util_rndGet(1, max2 - 1);
+  /* Give 50% chance the the uniform distribution */
+  switch (util_rndGet(0, 9)) {
 
-  uint64_t ret = rnd * rnd;
-  ret /= max3;
-  ret += 1;
-
-  if (ret < 1) {
-
-    LOG_F("ret (%" PRIu64 ") < 1, max:%zu, rnd:%" PRIu64, ret, max, rnd);
-
-  }
-
-  if (ret > max) {
-
-    LOG_F("ret (%" PRIu64 ") > max (%zu), rnd:%" PRIu64, ret, max, rnd);
+    case 0:
+      return (size_t)util_rndGet(1, HF_MIN(16, max));
+    case 1:
+      return (size_t)util_rndGet(1, HF_MIN(64, max));
+    case 2:
+      return (size_t)util_rndGet(1, HF_MIN(256, max));
+    case 3:
+      return (size_t)util_rndGet(1, HF_MIN(1024, max));
+    case 4:
+      return (size_t)util_rndGet(1, HF_MIN(4096, max));
+    default:
+      break;
 
   }
 
-  return (size_t)ret;
+  return (size_t)util_rndGet(1, max);
 
 }
 
diff --git a/custom_mutators/honggfuzz/mangle.h b/custom_mutators/honggfuzz/mangle.h
index 1b6a4943..f8f3988c 100644
--- a/custom_mutators/honggfuzz/mangle.h
+++ b/custom_mutators/honggfuzz/mangle.h
@@ -26,7 +26,6 @@
 
 #include "honggfuzz.h"
 
-extern void mangle_mangleContent(run_t *run, int speed_factor);
+extern void mangle_mangleContent(run_t* run, int speed_factor);
 
 #endif
-
-- 
cgit 1.4.1


From 1978629d87d87ee01d2f3ba074f7a1f68b88ab4d Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Fri, 7 Aug 2020 14:21:12 +0200
Subject: Custom Mutator readme (#495)

---
 custom_mutators/README.md | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/README.md b/custom_mutators/README.md
index a3b164be..3abcfef3 100644
--- a/custom_mutators/README.md
+++ b/custom_mutators/README.md
@@ -1,4 +1,9 @@
-# production ready custom mutators
+# Custom Mutators
+
+Custom mutators enhance and alter the mutation strategies of afl++.
+For further information and documentation on how to write your own, read [the docs](../docs/custom_mutators.md).
+
+## Production-Ready Custom Mutators
 
 This directory holds ready to use custom mutators.
 Just type "make" in the individual subdirectories.
@@ -11,15 +16,15 @@ and add `AFL_CUSTOM_MUTATOR_ONLY=1` if you only want to use the custom mutator.
 
 Multiple custom mutators can be used by separating their paths with `:` in the environment variable.
 
-# Other custom mutators
+## 3rd Party Custom Mutators
 
-## Superion port
+### Superion Mutators
 
 Adrian Tiron ported the Superion grammar fuzzer to afl++, it is WIP and
 requires cmake (among other things):
 [https://github.com/adrian-rt/superion-mutator](https://github.com/adrian-rt/superion-mutator)
 
-## Protobuf
+### libprotobuf Mutators
 
 There are two WIP protobuf projects, that require work to be working though:
 
-- 
cgit 1.4.1


From 7470b475a9b5e65afa78ca493867d8c980bd66db Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Tue, 18 Aug 2020 00:50:52 +0200
Subject: Reworked maybe_grow to take a single ptr, renamed to afl_realloc
 (#505)

* maybe_grow takes a single ptr

* fixed use_deflate

* reworked maybe_grow_bufsize

* helper to access underlying buf

* remove redundant realloc_block

* code format

* fixes

* added unit tests

* renamed maybe_grow to afl_realloc

* BUF_PARAMS -> AFL_BUF_PARAM
---
 custom_mutators/radamsa/custom_mutator_helpers.h  |   2 +-
 examples/afl_network_proxy/afl-network-server.c   |  34 +++--
 examples/custom_mutators/custom_mutator_helpers.h |   4 +-
 include/afl-fuzz.h                                |  25 ++-
 include/alloc-inl.h                               | 177 ++++++++++------------
 src/afl-fuzz-extras.c                             |  12 +-
 src/afl-fuzz-mutators.c                           |   3 +-
 src/afl-fuzz-one.c                                |  79 ++++++----
 src/afl-fuzz-python.c                             |  20 ++-
 src/afl-fuzz-queue.c                              |   7 +-
 src/afl-fuzz-redqueen.c                           |   8 +-
 src/afl-fuzz-run.c                                |   7 +-
 src/afl-fuzz-state.c                              |  14 +-
 test/unittests/unit_maybe_alloc.c                 | 109 +++++++++----
 14 files changed, 272 insertions(+), 229 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/radamsa/custom_mutator_helpers.h b/custom_mutators/radamsa/custom_mutator_helpers.h
index 0848321f..e23c0b6a 100644
--- a/custom_mutators/radamsa/custom_mutator_helpers.h
+++ b/custom_mutators/radamsa/custom_mutator_helpers.h
@@ -324,7 +324,7 @@ static inline void *maybe_grow(void **buf, size_t *size, size_t size_needed) {
 }
 
 /* Swaps buf1 ptr and buf2 ptr, as well as their sizes */
-static inline void swap_bufs(void **buf1, size_t *size1, void **buf2,
+static inline void afl_swap_bufs(void **buf1, size_t *size1, void **buf2,
                              size_t *size2) {
 
   void * scratch_buf = *buf1;
diff --git a/examples/afl_network_proxy/afl-network-server.c b/examples/afl_network_proxy/afl-network-server.c
index ab7874fd..c70fd47d 100644
--- a/examples/afl_network_proxy/afl-network-server.c
+++ b/examples/afl_network_proxy/afl-network-server.c
@@ -73,9 +73,8 @@ static u8 *in_file,                    /* Minimizer input test case         */
 static u8 *in_data;                    /* Input data for trimming           */
 static u8 *buf2;
 
-static s32    in_len;
-static u32    map_size = MAP_SIZE;
-static size_t buf2_len;
+static s32 in_len;
+static u32 map_size = MAP_SIZE;
 
 static volatile u8 stop_soon;          /* Ctrl-C pressed?                   */
 
@@ -272,7 +271,7 @@ static void set_up_environment(afl_forkserver_t *fsrv) {
 
       setenv("QEMU_SET_ENV", buf, 1);
 
-      ck_free(buf);
+      afl_free(buf);
 
     } else {
 
@@ -343,7 +342,7 @@ static void usage(u8 *argv0) {
 
 }
 
-int recv_testcase(int s, void **buf, size_t *max_len) {
+int recv_testcase(int s, void **buf) {
 
   u32    size;
   s32    ret;
@@ -358,7 +357,8 @@ int recv_testcase(int s, void **buf, size_t *max_len) {
 
   if ((size & 0xff000000) != 0xff000000) {
 
-    *buf = ck_maybe_grow(buf, max_len, size);
+    *buf = afl_realloc((void **)&buf, size);
+    if (unlikely(!buf)) { PFATAL("Alloc"); }
     received = 0;
     // fprintf(stderr, "unCOMPRESS (%u)\n", size);
     while (received < size &&
@@ -370,7 +370,8 @@ int recv_testcase(int s, void **buf, size_t *max_len) {
 #ifdef USE_DEFLATE
     u32 clen;
     size -= 0xff000000;
-    *buf = ck_maybe_grow(buf, max_len, size);
+    *buf = afl_realloc((void **)&buf, size);
+    if (unlikely(!buf)) { PFATAL("Alloc"); }
     received = 0;
     while (received < 4 &&
            (ret = recv(s, &clen + received, 4 - received, 0)) > 0)
@@ -379,15 +380,15 @@ int recv_testcase(int s, void **buf, size_t *max_len) {
     // fprintf(stderr, "received clen information of %d\n", clen);
     if (clen < 1)
       FATAL("did not receive valid compressed len information: %u", clen);
-    buf2 = ck_maybe_grow((void **)&buf2, &buf2_len, clen);
+    buf2 = afl_realloc((void **)&buf2, clen);
+    if (unlikely(!buf2)) { PFATAL("Alloc"); }
     received = 0;
     while (received < clen &&
            (ret = recv(s, buf2 + received, clen - received, 0)) > 0)
       received += ret;
     if (received != clen) FATAL("did not receive compressed information");
     if (libdeflate_deflate_decompress(decompressor, buf2, clen, (char *)*buf,
-                                      *max_len,
-                                      &received) != LIBDEFLATE_SUCCESS)
+                                      size, &received) != LIBDEFLATE_SUCCESS)
       FATAL("decompression failed");
       // fprintf(stderr, "DECOMPRESS (%u->%u):\n", clen, received);
       // for (u32 i = 0; i < clen; i++) fprintf(stderr, "%02x", buf2[i]);
@@ -413,7 +414,6 @@ int recv_testcase(int s, void **buf, size_t *max_len) {
 int main(int argc, char **argv_orig, char **envp) {
 
   s32    opt, s, sock, on = 1, port = -1;
-  size_t max_len = 0;
   u8     mem_limit_given = 0, timeout_given = 0, unicorn_mode = 0, use_wine = 0;
   char **use_argv;
   struct sockaddr_in6 serveraddr, clientaddr;
@@ -568,7 +568,8 @@ int main(int argc, char **argv_orig, char **envp) {
   sharedmem_t shm = {0};
   fsrv->trace_bits = afl_shm_init(&shm, map_size, 0);
 
-  in_data = ck_maybe_grow((void **)&in_data, &max_len, 65536);
+  in_data = afl_realloc((void **)&in_data, 65536);
+  if (unlikely(!in_data)) { PFATAL("Alloc"); }
 
   atexit(at_exit_handler);
   setup_signal_handlers();
@@ -639,7 +640,8 @@ int main(int argc, char **argv_orig, char **envp) {
 #ifdef USE_DEFLATE
   compressor = libdeflate_alloc_compressor(1);
   decompressor = libdeflate_alloc_decompressor();
-  buf2 = ck_maybe_grow((void **)&buf2, &buf2_len, map_size + 16);
+  buf2 = afl_realloc((void **)&buf2, map_size + 16);
+  if (unlikely(!buf2)) { PFATAL("alloc"); }
   lenptr = (u32 *)(buf2 + 4);
   fprintf(stderr, "Compiled with compression support\n");
 #endif
@@ -664,7 +666,7 @@ int main(int argc, char **argv_orig, char **envp) {
 
 #endif
 
-  while ((in_len = recv_testcase(s, (void **)&in_data, &max_len)) > 0) {
+  while ((in_len = recv_testcase(s, (void **)&in_data)) > 0) {
 
     // fprintf(stderr, "received %u\n", in_len);
     (void)run_target(fsrv, use_argv, in_data, in_len, 1);
@@ -697,9 +699,9 @@ int main(int argc, char **argv_orig, char **envp) {
   afl_shm_deinit(&shm);
   afl_fsrv_deinit(fsrv);
   if (fsrv->target_path) { ck_free(fsrv->target_path); }
-  if (in_data) { ck_free(in_data); }
+  afl_free(in_data);
 #if USE_DEFLATE
-  if (buf2) { ck_free(buf2); }
+  afl_free(buf2);
   libdeflate_free_compressor(compressor);
   libdeflate_free_decompressor(decompressor);
 #endif
diff --git a/examples/custom_mutators/custom_mutator_helpers.h b/examples/custom_mutators/custom_mutator_helpers.h
index 0848321f..ad5acb08 100644
--- a/examples/custom_mutators/custom_mutator_helpers.h
+++ b/examples/custom_mutators/custom_mutator_helpers.h
@@ -324,8 +324,8 @@ static inline void *maybe_grow(void **buf, size_t *size, size_t size_needed) {
 }
 
 /* Swaps buf1 ptr and buf2 ptr, as well as their sizes */
-static inline void swap_bufs(void **buf1, size_t *size1, void **buf2,
-                             size_t *size2) {
+static inline void afl_swap_bufs(void **buf1, size_t *size1, void **buf2,
+                                 size_t *size2) {
 
   void * scratch_buf = *buf1;
   size_t scratch_size = *size1;
diff --git a/include/afl-fuzz.h b/include/afl-fuzz.h
index ca7d10fe..dca395aa 100644
--- a/include/afl-fuzz.h
+++ b/include/afl-fuzz.h
@@ -126,6 +126,9 @@
 
 #define STAGE_BUF_SIZE (64)  /* usable size for stage name buf in afl_state */
 
+// Little helper to access the ptr to afl->##name_buf - for use in afl_realloc.
+#define AFL_BUF_PARAM(name) ((void **)&afl->name##_buf)
+
 extern s8  interesting_8[INTERESTING_8_LEN];
 extern s16 interesting_16[INTERESTING_8_LEN + INTERESTING_16_LEN];
 extern s32
@@ -572,7 +575,6 @@ typedef struct afl_state {
 
   // growing buf
   struct queue_entry **queue_buf;
-  size_t               queue_size;
 
   struct queue_entry **top_rated;           /* Top entries for bitmap bytes */
 
@@ -633,24 +635,18 @@ typedef struct afl_state {
 
   /*needed for afl_fuzz_one */
   // TODO: see which we can reuse
-  u8 *   out_buf;
-  size_t out_size;
+  u8 *out_buf;
 
-  u8 *   out_scratch_buf;
-  size_t out_scratch_size;
+  u8 *out_scratch_buf;
 
-  u8 *   eff_buf;
-  size_t eff_size;
+  u8 *eff_buf;
 
-  u8 *   in_buf;
-  size_t in_size;
+  u8 *in_buf;
 
-  u8 *   in_scratch_buf;
-  size_t in_scratch_size;
+  u8 *in_scratch_buf;
 
-  u8 *   ex_buf;
-  size_t ex_size;
-  u32    custom_mutators_count;
+  u8 *ex_buf;
+  u32 custom_mutators_count;
 
   list_t custom_mutator_list;
 
@@ -666,7 +662,6 @@ struct custom_mutator {
   char *      name_short;
   void *      dh;
   u8 *        post_process_buf;
-  size_t      post_process_size;
   u8          stacked_custom_prob, stacked_custom;
 
   void *data;                                    /* custom mutator data ptr */
diff --git a/include/alloc-inl.h b/include/alloc-inl.h
index 306cc622..90701d18 100644
--- a/include/alloc-inl.h
+++ b/include/alloc-inl.h
@@ -30,12 +30,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stddef.h>
 
 #include "config.h"
 #include "types.h"
 #include "debug.h"
 
-/* Initial size used for ck_maybe_grow */
+/* Initial size used for afl_realloc */
 #define INITIAL_GROWTH_SIZE (64)
 
 // Be careful! _WANT_ORIGINAL_AFL_ALLOC is not compatible with custom mutators
@@ -76,10 +77,6 @@
                                                                         \
     } while (0)
 
-  /* Allocator increments for ck_realloc_block(). */
-
-  #define ALLOC_BLK_INC 256
-
 /* Allocate a buffer, explicitly not zeroing it. Returns NULL for zero-sized
    requests. */
 
@@ -149,15 +146,6 @@ static inline void *DFL_ck_realloc(void *orig, u32 size) {
 
 }
 
-/* Re-allocate a buffer with ALLOC_BLK_INC increments (used to speed up
-   repeated small reallocs without complicating the user code). */
-
-static inline void *DFL_ck_realloc_block(void *orig, u32 size) {
-
-  return DFL_ck_realloc(orig, size);
-
-}
-
 /* Create a buffer with a copy of a string. Returns NULL for NULL inputs. */
 
 static inline u8 *DFL_ck_strdup(u8 *str) {
@@ -183,7 +171,6 @@ static inline u8 *DFL_ck_strdup(u8 *str) {
   #define ck_alloc DFL_ck_alloc
   #define ck_alloc_nozero DFL_ck_alloc_nozero
   #define ck_realloc DFL_ck_realloc
-  #define ck_realloc_block DFL_ck_realloc_block
   #define ck_strdup DFL_ck_strdup
   #define ck_free DFL_ck_free
 
@@ -239,10 +226,6 @@ static inline u8 *DFL_ck_strdup(u8 *str) {
   #define ALLOC_OFF_HEAD 8
   #define ALLOC_OFF_TOTAL (ALLOC_OFF_HEAD + 1)
 
-  /* Allocator increments for ck_realloc_block(). */
-
-  #define ALLOC_BLK_INC 256
-
   /* Sanity-checking macros for pointers. */
 
   #define CHECK_PTR(_p)                            \
@@ -402,29 +385,6 @@ static inline void *DFL_ck_realloc(void *orig, u32 size) {
 
 }
 
-/* Re-allocate a buffer with ALLOC_BLK_INC increments (used to speed up
-   repeated small reallocs without complicating the user code). */
-
-static inline void *DFL_ck_realloc_block(void *orig, u32 size) {
-
-  #ifndef DEBUG_BUILD
-
-  if (orig) {
-
-    CHECK_PTR(orig);
-
-    if (ALLOC_S(orig) >= size) return orig;
-
-    size += ALLOC_BLK_INC;
-
-  }
-
-  #endif                                                    /* !DEBUG_BUILD */
-
-  return DFL_ck_realloc(orig, size);
-
-}
-
 /* Create a buffer with a copy of a string. Returns NULL for NULL inputs. */
 
 static inline u8 *DFL_ck_strdup(u8 *str) {
@@ -458,7 +418,6 @@ static inline u8 *DFL_ck_strdup(u8 *str) {
     #define ck_alloc DFL_ck_alloc
     #define ck_alloc_nozero DFL_ck_alloc_nozero
     #define ck_realloc DFL_ck_realloc
-    #define ck_realloc_block DFL_ck_realloc_block
     #define ck_strdup DFL_ck_strdup
     #define ck_free DFL_ck_free
 
@@ -528,8 +487,8 @@ static inline void TRK_alloc_buf(void *ptr, const char *file, const char *func,
 
   /* No space available - allocate more. */
 
-  TRK[bucket] = DFL_ck_realloc_block(
-      TRK[bucket], (TRK_cnt[bucket] + 1) * sizeof(struct TRK_obj));
+  TRK[bucket] = DFL_ck_realloc(TRK[bucket],
+                               (TRK_cnt[bucket] + 1) * sizeof(struct TRK_obj));
 
   TRK[bucket][i].ptr = ptr;
   TRK[bucket][i].file = (char *)file;
@@ -604,16 +563,6 @@ static inline void *TRK_ck_realloc(void *orig, u32 size, const char *file,
 
 }
 
-static inline void *TRK_ck_realloc_block(void *orig, u32 size, const char *file,
-                                         const char *func, u32 line) {
-
-  void *ret = DFL_ck_realloc_block(orig, size);
-  TRK_free_buf(orig, file, func, line);
-  TRK_alloc_buf(ret, file, func, line);
-  return ret;
-
-}
-
 static inline void *TRK_ck_strdup(u8 *str, const char *file, const char *func,
                                   u32 line) {
 
@@ -641,9 +590,6 @@ static inline void TRK_ck_free(void *ptr, const char *file, const char *func,
     #define ck_realloc(_p1, _p2) \
       TRK_ck_realloc(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
 
-    #define ck_realloc_block(_p1, _p2) \
-      TRK_ck_realloc_block(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
-
     #define ck_strdup(_p1) TRK_ck_strdup(_p1, __FILE__, __FUNCTION__, __LINE__)
 
     #define ck_free(_p1) TRK_ck_free(_p1, __FILE__, __FUNCTION__, __LINE__)
@@ -657,11 +603,14 @@ static inline void TRK_ck_free(void *ptr, const char *file, const char *func,
 */
 static inline size_t next_pow2(size_t in) {
 
-  if (in == 0 || in > (size_t)-1) {
-
-    return 0;                  /* avoid undefined behaviour under-/overflow */
+  // Commented this out as this behavior doesn't change, according to unittests
+  // if (in == 0 || in > (size_t)-1) {
 
-  }
+  //
+  //   return 0;                  /* avoid undefined behaviour under-/overflow
+  //   */
+  //
+  // }
 
   size_t out = in - 1;
   out |= out >> 1;
@@ -673,32 +622,32 @@ static inline size_t next_pow2(size_t in) {
 
 }
 
-/* This function makes sure *size is > size_needed after call.
- It will realloc *buf otherwise.
- *size will grow exponentially as per:
- https://blog.mozilla.org/nnethercote/2014/11/04/please-grow-your-buffers-exponentially/
- Will return NULL and free *buf if size_needed is <1 or realloc failed.
- @return For convenience, this function returns *buf.
- */
-static inline void *maybe_grow(void **buf, size_t *size, size_t size_needed) {
+/* AFL alloc buffer, the struct is here so we don't need to do fancy ptr
+ * arithmetics */
+struct afl_alloc_buf {
 
-  /* No need to realloc */
-  if (likely(size_needed && *size >= size_needed)) { return *buf; }
+  /* The complete allocated size, including the header of len
+   * AFL_ALLOC_SIZE_OFFSET */
+  size_t complete_size;
+  /* ptr to the first element of the actual buffer */
+  u8 buf[0];
 
-  /* No initial size was set */
-  if (size_needed < INITIAL_GROWTH_SIZE) { size_needed = INITIAL_GROWTH_SIZE; }
+};
 
-  /* grow exponentially */
-  size_t next_size = next_pow2(size_needed);
+#define AFL_ALLOC_SIZE_OFFSET (offsetof(struct afl_alloc_buf, buf))
 
-  /* handle overflow and zero size_needed */
-  if (!next_size) { next_size = size_needed; }
+/* Returs the container element to this ptr */
+static inline struct afl_alloc_buf *afl_alloc_bufptr(void *buf) {
 
-  /* alloc */
-  *buf = realloc(*buf, next_size);
-  *size = *buf ? next_size : 0;
+  return (struct afl_alloc_buf *)((u8 *)buf - AFL_ALLOC_SIZE_OFFSET);
 
-  return *buf;
+}
+
+/* Gets the maximum size of the buf contents (ptr->complete_size -
+ * AFL_ALLOC_SIZE_OFFSET) */
+static inline size_t afl_alloc_bufsize(void *buf) {
+
+  return afl_alloc_bufptr(buf)->complete_size - AFL_ALLOC_SIZE_OFFSET;
 
 }
 
@@ -706,45 +655,71 @@ static inline void *maybe_grow(void **buf, size_t *size, size_t size_needed) {
  It will realloc *buf otherwise.
  *size will grow exponentially as per:
  https://blog.mozilla.org/nnethercote/2014/11/04/please-grow-your-buffers-exponentially/
- Will FATAL if size_needed is <1.
+ Will return NULL and free *buf if size_needed is <1 or realloc failed.
  @return For convenience, this function returns *buf.
  */
-static inline void *ck_maybe_grow(void **buf, size_t *size,
-                                  size_t size_needed) {
+static inline void *afl_realloc(void **buf, size_t size_needed) {
+
+  struct afl_alloc_buf *new_buf = NULL;
 
-  /* Oops. found a bug? */
-  if (unlikely(size_needed < 1)) { FATAL("cannot grow to non-positive size"); }
+  size_t current_size = 0;
+  size_t next_size = 0;
+
+  if (likely(*buf)) {
+
+    /* the size is always stored at buf - 1*size_t */
+    new_buf = afl_alloc_bufptr(*buf);
+    current_size = new_buf->complete_size;
+
+  }
+
+  size_needed += AFL_ALLOC_SIZE_OFFSET;
 
   /* No need to realloc */
-  if (likely(*size >= size_needed)) { return *buf; }
+  if (likely(current_size >= size_needed)) { return *buf; }
 
   /* No initial size was set */
-  if (size_needed < INITIAL_GROWTH_SIZE) { size_needed = INITIAL_GROWTH_SIZE; }
+  if (size_needed < INITIAL_GROWTH_SIZE) {
 
-  /* grow exponentially */
-  size_t next_size = next_pow2(size_needed);
+    next_size = INITIAL_GROWTH_SIZE;
 
-  /* handle overflow */
-  if (!next_size) { next_size = size_needed; }
+  } else {
+
+    /* grow exponentially */
+    next_size = next_pow2(size_needed);
+
+    /* handle overflow: fall back to the original size_needed */
+    if (unlikely(!next_size)) { next_size = size_needed; }
+
+  }
 
   /* alloc */
-  *buf = ck_realloc(*buf, next_size);
-  *size = next_size;
+  new_buf = realloc(new_buf, next_size);
+  if (unlikely(!new_buf)) {
 
+    *buf = NULL;
+    return NULL;
+
+  }
+
+  new_buf->complete_size = next_size;
+  *buf = (void *)(new_buf->buf);
   return *buf;
 
 }
 
+static inline void afl_free(void *buf) {
+
+  if (buf) { free(afl_alloc_bufptr(buf)); }
+
+}
+
 /* Swaps buf1 ptr and buf2 ptr, as well as their sizes */
-static inline void swap_bufs(void **buf1, size_t *size1, void **buf2,
-                             size_t *size2) {
+static inline void afl_swap_bufs(void **buf1, void **buf2) {
 
-  void * scratch_buf = *buf1;
-  size_t scratch_size = *size1;
+  void *scratch_buf = *buf1;
   *buf1 = *buf2;
-  *size1 = *size2;
   *buf2 = scratch_buf;
-  *size2 = scratch_size;
 
 }
 
diff --git a/src/afl-fuzz-extras.c b/src/afl-fuzz-extras.c
index 17f02984..88262a98 100644
--- a/src/afl-fuzz-extras.c
+++ b/src/afl-fuzz-extras.c
@@ -152,8 +152,10 @@ void load_extras_file(afl_state_t *afl, u8 *fname, u32 *min_len, u32 *max_len,
     /* Okay, let's allocate memory and copy data between "...", handling
        \xNN escaping, \\, and \". */
 
-    afl->extras = ck_realloc_block(
-        afl->extras, (afl->extras_cnt + 1) * sizeof(struct extra_data));
+    afl->extras =
+        afl_realloc((void **)&afl->extras,
+                    (afl->extras_cnt + 1) * sizeof(struct extra_data));
+    if (unlikely(!afl->extras)) { PFATAL("alloc"); }
 
     wptr = afl->extras[afl->extras_cnt].data = ck_alloc(rptr - lptr);
 
@@ -296,8 +298,10 @@ void load_extras(afl_state_t *afl, u8 *dir) {
     if (min_len > st.st_size) { min_len = st.st_size; }
     if (max_len < st.st_size) { max_len = st.st_size; }
 
-    afl->extras = ck_realloc_block(
-        afl->extras, (afl->extras_cnt + 1) * sizeof(struct extra_data));
+    afl->extras =
+        afl_realloc((void **)&afl->extras,
+                    (afl->extras_cnt + 1) * sizeof(struct extra_data));
+    if (unlikely(!afl->extras)) { PFATAL("alloc"); }
 
     afl->extras[afl->extras_cnt].data = ck_alloc(st.st_size);
     afl->extras[afl->extras_cnt].len = st.st_size;
diff --git a/src/afl-fuzz-mutators.c b/src/afl-fuzz-mutators.c
index 0fa646f9..22578df9 100644
--- a/src/afl-fuzz-mutators.c
+++ b/src/afl-fuzz-mutators.c
@@ -122,9 +122,8 @@ void destroy_custom_mutators(afl_state_t *afl) {
 
       if (el->post_process_buf) {
 
-        ck_free(el->post_process_buf);
+        afl_free(el->post_process_buf);
         el->post_process_buf = NULL;
-        el->post_process_size = 0;
 
       }
 
diff --git a/src/afl-fuzz-one.c b/src/afl-fuzz-one.c
index 0a4be320..3bf0c195 100644
--- a/src/afl-fuzz-one.c
+++ b/src/afl-fuzz-one.c
@@ -364,8 +364,6 @@ static void locate_diffs(u8 *ptr1, u8 *ptr2, u32 len, s32 *first, s32 *last) {
 
 #endif                                                     /* !IGNORE_FINDS */
 
-#define BUF_PARAMS(name) (void **)&afl->name##_buf, &afl->name##_size
-
 /* Take the current entry from the queue, fuzz it for a while. This
    function is a tad too long... returns 0 if fuzzed successfully, 1 if
    skipped or bailed out. */
@@ -384,9 +382,6 @@ u8 fuzz_one_original(afl_state_t *afl) {
   u8  a_collect[MAX_AUTO_EXTRA];
   u32 a_len = 0;
 
-/* Not pretty, but saves a lot of writing */
-#define BUF_PARAMS(name) (void **)&afl->name##_buf, &afl->name##_size
-
 #ifdef IGNORE_FINDS
 
   /* In IGNORE_FINDS mode, skip any entries that weren't in the
@@ -484,7 +479,8 @@ u8 fuzz_one_original(afl_state_t *afl) {
      single byte anyway, so it wouldn't give us any performance or memory usage
      benefits. */
 
-  out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+  out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+  if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
   afl->subseq_tmouts = 0;
 
@@ -800,7 +796,8 @@ u8 fuzz_one_original(afl_state_t *afl) {
   /* Initialize effector map for the next step (see comments below). Always
      flag first and last byte as doing something. */
 
-  eff_map = ck_maybe_grow(BUF_PARAMS(eff), EFF_ALEN(len));
+  eff_map = afl_realloc(AFL_BUF_PARAM(eff), EFF_ALEN(len));
+  if (unlikely(!eff_map)) { PFATAL("alloc"); }
   eff_map[0] = 1;
 
   if (EFF_APOS(len - 1) != 0) {
@@ -1557,7 +1554,8 @@ skip_interest:
 
   orig_hit_cnt = new_hit_cnt;
 
-  ex_tmp = ck_maybe_grow(BUF_PARAMS(ex), len + MAX_DICT_FILE);
+  ex_tmp = afl_realloc(AFL_BUF_PARAM(ex), len + MAX_DICT_FILE);
+  if (unlikely(!ex_tmp)) { PFATAL("alloc"); }
 
   for (i = 0; i <= (u32)len; ++i) {
 
@@ -1733,7 +1731,8 @@ custom_mutator_stage:
         fd = open(target->fname, O_RDONLY);
         if (unlikely(fd < 0)) { PFATAL("Unable to open '%s'", target->fname); }
 
-        new_buf = ck_maybe_grow(BUF_PARAMS(out_scratch), target->len);
+        new_buf = afl_realloc(AFL_BUF_PARAM(out_scratch), target->len);
+        if (unlikely(!new_buf)) { PFATAL("alloc"); }
         ck_read(fd, new_buf, target->len, target->fname);
         close(fd);
 
@@ -1908,7 +1907,8 @@ havoc_stage:
               temp_len = new_len;
               if (out_buf != custom_havoc_buf) {
 
-                ck_maybe_grow(BUF_PARAMS(out), temp_len);
+                afl_realloc(AFL_BUF_PARAM(out), temp_len);
+                if (unlikely(!afl->out_buf)) { PFATAL("alloc"); }
                 memcpy(out_buf, custom_havoc_buf, temp_len);
 
               }
@@ -2147,7 +2147,8 @@ havoc_stage:
             clone_to = rand_below(afl, temp_len);
 
             new_buf =
-                ck_maybe_grow(BUF_PARAMS(out_scratch), temp_len + clone_len);
+                afl_realloc(AFL_BUF_PARAM(out_scratch), temp_len + clone_len);
+            if (unlikely(!new_buf)) { PFATAL("alloc"); }
 
             /* Head */
 
@@ -2172,7 +2173,7 @@ havoc_stage:
             memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
                    temp_len - clone_to);
 
-            swap_bufs(BUF_PARAMS(out), BUF_PARAMS(out_scratch));
+            afl_swap_bufs(AFL_BUF_PARAM(out), AFL_BUF_PARAM(out_scratch));
             out_buf = new_buf;
             new_buf = NULL;
             temp_len += clone_len;
@@ -2287,7 +2288,8 @@ havoc_stage:
 
               if (temp_len + extra_len >= MAX_FILE) { break; }
 
-              out_buf = ck_maybe_grow(BUF_PARAMS(out), temp_len + extra_len);
+              out_buf = afl_realloc(AFL_BUF_PARAM(out), temp_len + extra_len);
+              if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
               /* Tail */
               memmove(out_buf + insert_at + extra_len, out_buf + insert_at,
@@ -2343,7 +2345,8 @@ havoc_stage:
             }
 
             u32 new_len = target->len;
-            u8 *new_buf = ck_maybe_grow(BUF_PARAMS(in_scratch), new_len);
+            u8 *new_buf = afl_realloc(AFL_BUF_PARAM(in_scratch), new_len);
+            if (unlikely(!new_buf)) { PFATAL("alloc"); }
 
             ck_read(fd, new_buf, new_len, target->fname);
 
@@ -2383,7 +2386,8 @@ havoc_stage:
               clone_to = rand_below(afl, temp_len);
 
               u8 *temp_buf =
-                  ck_maybe_grow(BUF_PARAMS(out_scratch), temp_len + clone_len);
+                  afl_realloc(AFL_BUF_PARAM(out_scratch), temp_len + clone_len);
+              if (unlikely(!temp_buf)) { PFATAL("alloc"); }
 
               /* Head */
 
@@ -2397,7 +2401,7 @@ havoc_stage:
               memcpy(temp_buf + clone_to + clone_len, out_buf + clone_to,
                      temp_len - clone_to);
 
-              swap_bufs(BUF_PARAMS(out), BUF_PARAMS(out_scratch));
+              afl_swap_bufs(AFL_BUF_PARAM(out), AFL_BUF_PARAM(out_scratch));
               out_buf = temp_buf;
               temp_len += clone_len;
 
@@ -2418,7 +2422,8 @@ havoc_stage:
     /* out_buf might have been mangled a bit, so let's restore it to its
        original size and shape. */
 
-    out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+    out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+    if (unlikely(!out_buf)) { PFATAL("alloc"); }
     temp_len = len;
     memcpy(out_buf, in_buf, len);
 
@@ -2513,7 +2518,8 @@ retry_splicing:
 
     if (unlikely(fd < 0)) { PFATAL("Unable to open '%s'", target->fname); }
 
-    new_buf = ck_maybe_grow(BUF_PARAMS(in_scratch), target->len);
+    new_buf = afl_realloc(AFL_BUF_PARAM(in_scratch), target->len);
+    if (unlikely(!new_buf)) { PFATAL("alloc"); }
 
     ck_read(fd, new_buf, target->len, target->fname);
 
@@ -2535,10 +2541,11 @@ retry_splicing:
 
     len = target->len;
     memcpy(new_buf, in_buf, split_at);
-    swap_bufs(BUF_PARAMS(in), BUF_PARAMS(in_scratch));
+    afl_swap_bufs(AFL_BUF_PARAM(in), AFL_BUF_PARAM(in_scratch));
     in_buf = new_buf;
 
-    out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+    out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+    if (unlikely(!out_buf)) { PFATAL("alloc"); }
     memcpy(out_buf, in_buf, len);
 
     goto custom_mutator_stage;
@@ -2679,7 +2686,8 @@ static u8 mopt_common_fuzzing(afl_state_t *afl, MOpt_globals_t MOpt_globals) {
      single byte anyway, so it wouldn't give us any performance or memory usage
      benefits. */
 
-  out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+  out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+  if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
   afl->subseq_tmouts = 0;
 
@@ -3001,7 +3009,8 @@ static u8 mopt_common_fuzzing(afl_state_t *afl, MOpt_globals_t MOpt_globals) {
   /* Initialize effector map for the next step (see comments below). Always
          flag first and last byte as doing something. */
 
-  eff_map = ck_maybe_grow(BUF_PARAMS(eff), EFF_ALEN(len));
+  eff_map = afl_realloc(AFL_BUF_PARAM(eff), EFF_ALEN(len));
+  if (unlikely(!eff_map)) { PFATAL("alloc"); }
   eff_map[0] = 1;
 
   if (EFF_APOS(len - 1) != 0) {
@@ -3758,7 +3767,8 @@ skip_interest:
 
   orig_hit_cnt = new_hit_cnt;
 
-  ex_tmp = ck_maybe_grow(BUF_PARAMS(ex), len + MAX_DICT_FILE);
+  ex_tmp = afl_realloc(AFL_BUF_PARAM(ex), len + MAX_DICT_FILE);
+  if (unlikely(!ex_tmp)) { PFATAL("alloc"); }
 
   for (i = 0; i <= (u32)len; ++i) {
 
@@ -4196,8 +4206,9 @@ pacemaker_fuzzing:
 
                 clone_to = rand_below(afl, temp_len);
 
-                new_buf = ck_maybe_grow(BUF_PARAMS(out_scratch),
-                                        temp_len + clone_len);
+                new_buf = afl_realloc(AFL_BUF_PARAM(out_scratch),
+                                      temp_len + clone_len);
+                if (unlikely(!new_buf)) { PFATAL("alloc"); }
 
                 /* Head */
 
@@ -4223,7 +4234,7 @@ pacemaker_fuzzing:
                 memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
                        temp_len - clone_to);
 
-                swap_bufs(BUF_PARAMS(out), BUF_PARAMS(out_scratch));
+                afl_swap_bufs(AFL_BUF_PARAM(out), AFL_BUF_PARAM(out_scratch));
                 out_buf = new_buf;
                 temp_len += clone_len;
                 MOpt_globals.cycles_v2[STAGE_Clone75] += 1;
@@ -4340,7 +4351,8 @@ pacemaker_fuzzing:
 
               if (temp_len + extra_len >= MAX_FILE) break;
 
-              out_buf = ck_maybe_grow(BUF_PARAMS(out), temp_len + extra_len);
+              out_buf = afl_realloc(AFL_BUF_PARAM(out), temp_len + extra_len);
+              if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
               /* Tail */
               memmove(out_buf + insert_at + extra_len, out_buf + insert_at,
@@ -4373,7 +4385,8 @@ pacemaker_fuzzing:
         /* out_buf might have been mangled a bit, so let's restore it to its
            original size and shape. */
 
-        out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+        out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+        if (unlikely(!out_buf)) { PFATAL("alloc"); }
         temp_len = len;
         memcpy(out_buf, in_buf, len);
 
@@ -4518,7 +4531,8 @@ pacemaker_fuzzing:
 
         if (fd < 0) { PFATAL("Unable to open '%s'", target->fname); }
 
-        new_buf = ck_maybe_grow(BUF_PARAMS(in_scratch), target->len);
+        new_buf = afl_realloc(AFL_BUF_PARAM(in_scratch), target->len);
+        if (unlikely(!new_buf)) { PFATAL("alloc"); }
 
         ck_read(fd, new_buf, target->len, target->fname);
 
@@ -4545,9 +4559,10 @@ pacemaker_fuzzing:
 
         len = target->len;
         memcpy(new_buf, in_buf, split_at);
-        swap_bufs(BUF_PARAMS(in), BUF_PARAMS(in_scratch));
+        afl_swap_bufs(AFL_BUF_PARAM(in), AFL_BUF_PARAM(in_scratch));
         in_buf = new_buf;
-        out_buf = ck_maybe_grow(BUF_PARAMS(out), len);
+        out_buf = afl_realloc(AFL_BUF_PARAM(out), len);
+        if (unlikely(!out_buf)) { PFATAL("alloc"); }
         memcpy(out_buf, in_buf, len);
 
         goto havoc_stage_puppet;
@@ -4880,5 +4895,3 @@ u8 fuzz_one(afl_state_t *afl) {
 
 }
 
-#undef BUF_PARAMS
-
diff --git a/src/afl-fuzz-python.c b/src/afl-fuzz-python.c
index a077469e..e540f548 100644
--- a/src/afl-fuzz-python.c
+++ b/src/afl-fuzz-python.c
@@ -40,9 +40,7 @@ static void *unsupported(afl_state_t *afl, unsigned int seed) {
 
   /* sorry for this makro...
   it just fills in `&py_mutator->something_buf, &py_mutator->something_size`. */
-  #define BUF_PARAMS(name)                              \
-    (void **)&((py_mutator_t *)py_mutator)->name##_buf, \
-        &((py_mutator_t *)py_mutator)->name##_size
+  #define BUF_PARAMS(name) (void **)&((py_mutator_t *)py_mutator)->name##_buf
 
 static size_t fuzz_py(void *py_mutator, u8 *buf, size_t buf_size, u8 **out_buf,
                       u8 *add_buf, size_t add_buf_size, size_t max_size) {
@@ -97,7 +95,8 @@ static size_t fuzz_py(void *py_mutator, u8 *buf, size_t buf_size, u8 **out_buf,
 
     mutated_size = PyByteArray_Size(py_value);
 
-    *out_buf = ck_maybe_grow(BUF_PARAMS(fuzz), mutated_size);
+    *out_buf = afl_realloc(BUF_PARAMS(fuzz), mutated_size);
+    if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
     memcpy(*out_buf, PyByteArray_AsString(py_value), mutated_size);
     Py_DECREF(py_value);
@@ -317,7 +316,6 @@ struct custom_mutator *load_custom_mutator_py(afl_state_t *afl,
 
   mutator = ck_alloc(sizeof(struct custom_mutator));
   mutator->post_process_buf = NULL;
-  mutator->post_process_size = 0;
 
   mutator->name = module_name;
   ACTF("Loading Python mutator library from '%s'...", module_name);
@@ -419,7 +417,11 @@ size_t post_process_py(void *py_mutator, u8 *buf, size_t buf_size,
 
     py_out_buf_size = PyByteArray_Size(py_value);
 
-    ck_maybe_grow(BUF_PARAMS(post_process), py_out_buf_size);
+    if (unlikely(!afl_realloc(BUF_PARAMS(post_process), py_out_buf_size))) {
+
+      PFATAL("alloc");
+
+    }
 
     memcpy(py->post_process_buf, PyByteArray_AsString(py_value),
            py_out_buf_size);
@@ -527,7 +529,8 @@ size_t trim_py(void *py_mutator, u8 **out_buf) {
   if (py_value != NULL) {
 
     ret = PyByteArray_Size(py_value);
-    *out_buf = ck_maybe_grow(BUF_PARAMS(trim), ret);
+    *out_buf = afl_realloc(BUF_PARAMS(trim), ret);
+    if (unlikely(!out_buf)) { PFATAL("alloc"); }
     memcpy(*out_buf, PyByteArray_AsString(py_value), ret);
     Py_DECREF(py_value);
 
@@ -592,7 +595,8 @@ size_t havoc_mutation_py(void *py_mutator, u8 *buf, size_t buf_size,
     } else {
 
       /* A new buf is needed... */
-      *out_buf = ck_maybe_grow(BUF_PARAMS(havoc), mutated_size);
+      *out_buf = afl_realloc(BUF_PARAMS(havoc), mutated_size);
+      if (unlikely(!out_buf)) { PFATAL("alloc"); }
 
     }
 
diff --git a/src/afl-fuzz-queue.c b/src/afl-fuzz-queue.c
index f35df914..0c472845 100644
--- a/src/afl-fuzz-queue.c
+++ b/src/afl-fuzz-queue.c
@@ -26,8 +26,6 @@
 #include <limits.h>
 #include <ctype.h>
 
-#define BUF_PARAMS(name) (void **)&afl->name##_buf, &afl->name##_size
-
 /* Mark deterministic checks as done for a particular queue entry. We use the
    .state file to avoid repeating deterministic fuzzing when resuming aborted
    scans. */
@@ -248,8 +246,9 @@ void add_to_queue(afl_state_t *afl, u8 *fname, u32 len, u8 passed_det) {
 
   }
 
-  struct queue_entry **queue_buf = ck_maybe_grow(
-      BUF_PARAMS(queue), afl->queued_paths * sizeof(struct queue_entry *));
+  struct queue_entry **queue_buf = afl_realloc(
+      AFL_BUF_PARAM(queue), afl->queued_paths * sizeof(struct queue_entry *));
+  if (unlikely(!queue_buf)) { PFATAL("alloc"); }
   queue_buf[afl->queued_paths - 1] = q;
 
   afl->last_path_time = get_cur_time();
diff --git a/src/afl-fuzz-redqueen.c b/src/afl-fuzz-redqueen.c
index f21dd0b0..1ae6ab54 100644
--- a/src/afl-fuzz-redqueen.c
+++ b/src/afl-fuzz-redqueen.c
@@ -313,8 +313,6 @@ static unsigned long long strntoull(const char *str, size_t sz, char **end,
 
 }
 
-#define BUF_PARAMS(name) (void **)&afl->name##_buf, &afl->name##_size
-
 static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
                               u64 pattern, u64 repl, u64 o_pattern, u32 idx,
                               u8 *orig_buf, u8 *buf, u32 len, u8 do_reverse,
@@ -358,7 +356,8 @@ static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
     size_t old_len = endptr - buf_8;
     size_t num_len = snprintf(NULL, 0, "%lld", num);
 
-    u8 *new_buf = ck_maybe_grow(BUF_PARAMS(out_scratch), len + num_len);
+    u8 *new_buf = afl_realloc((void **)&afl->out_scratch_buf, len + num_len);
+    if (unlikely(!new_buf)) { PFATAL("alloc"); }
     memcpy(new_buf, buf, idx);
 
     snprintf(new_buf + idx, num_len, "%lld", num);
@@ -371,7 +370,8 @@ static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
     size_t old_len = endptr - buf_8;
     size_t num_len = snprintf(NULL, 0, "%llu", unum);
 
-    u8 *new_buf = ck_maybe_grow(BUF_PARAMS(out_scratch), len + num_len);
+    u8 *new_buf = afl_realloc((void **)&afl->out_scratch_buf, len + num_len);
+    if (unlikely(!new_buf)) { PFATAL("alloc"); }
     memcpy(new_buf, buf, idx);
 
     snprintf(new_buf + idx, num_len, "%llu", unum);
diff --git a/src/afl-fuzz-run.c b/src/afl-fuzz-run.c
index d3f823c9..d71ec339 100644
--- a/src/afl-fuzz-run.c
+++ b/src/afl-fuzz-run.c
@@ -135,8 +135,6 @@ write_to_testcase(afl_state_t *afl, void *mem, u32 len) {
 
 }
 
-#define BUF_PARAMS(name) (void **)&afl->name##_buf, &afl->name##_size
-
 /* The same, but with an adjustable gap. Used for trimming. */
 
 static void write_with_gap(afl_state_t *afl, u8 *mem, u32 len, u32 skip_at,
@@ -149,7 +147,8 @@ static void write_with_gap(afl_state_t *afl, u8 *mem, u32 len, u32 skip_at,
   This memory is used to carry out the post_processing(if present) after copying
   the testcase by removing the gaps. This can break though
   */
-  u8 *mem_trimmed = ck_maybe_grow(BUF_PARAMS(out_scratch), len - skip_len + 1);
+  u8 *mem_trimmed = afl_realloc(AFL_BUF_PARAM(out_scratch), len - skip_len + 1);
+  if (unlikely(!mem_trimmed)) { PFATAL("alloc"); }
 
   ssize_t new_size = len - skip_len;
   void *  new_mem = mem;
@@ -288,8 +287,6 @@ static void write_with_gap(afl_state_t *afl, u8 *mem, u32 len, u32 skip_at,
 
 }
 
-#undef BUF_PARAMS
-
 /* Calibrate a new test case. This is done when processing the input directory
    to warn about flaky or otherwise problematic test cases early on; and when
    new paths are discovered to detect variable behavior and so on. */
diff --git a/src/afl-fuzz-state.c b/src/afl-fuzz-state.c
index d4de91a4..e68e7786 100644
--- a/src/afl-fuzz-state.c
+++ b/src/afl-fuzz-state.c
@@ -421,13 +421,13 @@ void afl_state_deinit(afl_state_t *afl) {
   if (afl->pass_stats) { ck_free(afl->pass_stats); }
   if (afl->orig_cmp_map) { ck_free(afl->orig_cmp_map); }
 
-  if (afl->queue_buf) { free(afl->queue_buf); }
-  if (afl->out_buf) { free(afl->out_buf); }
-  if (afl->out_scratch_buf) { free(afl->out_scratch_buf); }
-  if (afl->eff_buf) { free(afl->eff_buf); }
-  if (afl->in_buf) { free(afl->in_buf); }
-  if (afl->in_scratch_buf) { free(afl->in_scratch_buf); }
-  if (afl->ex_buf) { free(afl->ex_buf); }
+  afl_free(afl->queue_buf);
+  afl_free(afl->out_buf);
+  afl_free(afl->out_scratch_buf);
+  afl_free(afl->eff_buf);
+  afl_free(afl->in_buf);
+  afl_free(afl->in_scratch_buf);
+  afl_free(afl->ex_buf);
 
   ck_free(afl->virgin_bits);
   ck_free(afl->virgin_tmout);
diff --git a/test/unittests/unit_maybe_alloc.c b/test/unittests/unit_maybe_alloc.c
index 889ced8a..e452e2f2 100644
--- a/test/unittests/unit_maybe_alloc.c
+++ b/test/unittests/unit_maybe_alloc.c
@@ -42,7 +42,24 @@ int __wrap_printf(const char *format, ...) {
     return 1;
 }
 
-#define BUF_PARAMS (void **)&buf, &size
+#define VOID_BUF (void **)&buf
+
+static void *create_fake_maybe_grow_of(size_t size) {
+
+    size += AFL_ALLOC_SIZE_OFFSET;
+
+    // fake a realloc buf
+    
+    struct afl_alloc_buf *buf = malloc(size);
+    if (!buf) {
+        perror("Could not allocate fake buf");
+        return NULL;
+    }
+    buf->complete_size = size; // The size
+    void *actual_buf = (void *)(buf->buf);
+    return actual_buf;
+
+}
 
 /*
 static int setup(void **state) {
@@ -52,29 +69,55 @@ static int setup(void **state) {
 }
 */
 
+static void test_pow2(void **state) {
+    (void)state;
+
+    assert_int_equal(next_pow2(64), 64);
+    assert_int_equal(next_pow2(63), 64);
+    assert_int_not_equal(next_pow2(65), 65);
+    assert_int_equal(next_pow2(0x100), 0x100);
+    assert_int_equal(next_pow2(0x180), 0x200);
+    assert_int_equal(next_pow2(108), 0x80);
+    assert_int_equal(next_pow2(0), 0);
+    assert_int_equal(next_pow2(1), 1);
+    assert_int_equal(next_pow2(2), 2);
+    assert_int_equal(next_pow2(3), 4);
+    assert_int_equal(next_pow2(0xFFFFFF), 0x1000000);
+    assert_int_equal(next_pow2(0xFFFFFFF), 0x10000000);
+    assert_int_equal(next_pow2(0xFFFFFF0), 0x10000000);
+    assert_int_equal(next_pow2(SIZE_MAX), 0);
+    assert_int_equal(next_pow2(-1), 0);
+    assert_int_equal(next_pow2(-2), 0);
+
+}
+
 static void test_null_allocs(void **state) {
     (void)state;
 
     void *buf = NULL;
-    size_t size = 0;
-    void *ptr = ck_maybe_grow(BUF_PARAMS, 100);
+    void *ptr = afl_realloc(VOID_BUF, 100);
+    if (unlikely(!buf)) { PFATAL("alloc"); }
+    size_t size = afl_alloc_bufsize(buf);
     assert_true(buf == ptr);
     assert_true(size >= 100);
-    ck_free(ptr);
+    afl_free(ptr);
 
 }
 
 static void test_nonpow2_size(void **state) {
     (void)state;
 
-    char *buf = ck_alloc(150);
-    size_t size = 150;
+    char *buf = create_fake_maybe_grow_of(150);
+
     buf[140] = '5';
-    char *ptr = ck_maybe_grow(BUF_PARAMS, 160);
+
+    char *ptr = afl_realloc(VOID_BUF, 160);
+    if (unlikely(!ptr)) { PFATAL("alloc"); }
+    size_t size = afl_alloc_bufsize(buf);
     assert_ptr_equal(buf, ptr);
     assert_true(size >= 160);
     assert_true(buf[140] == '5');
-    ck_free(ptr);
+    afl_free(ptr);
 
 }
 
@@ -83,32 +126,37 @@ static void test_zero_size(void **state) {
 
     char *buf = NULL;
     size_t size = 0;
-    assert_non_null(maybe_grow(BUF_PARAMS, 0));
-    free(buf);
+    char *new_buf = afl_realloc(VOID_BUF, 0);
+    assert_non_null(new_buf);
+    assert_ptr_equal(buf, new_buf);
+    afl_free(buf);
     buf = NULL;
     size = 0;
 
-    char *ptr = ck_maybe_grow(BUF_PARAMS, 100);
+    char *ptr = afl_realloc(VOID_BUF, 100);
+    if (unlikely(!ptr)) { PFATAL("alloc"); }
+    size = afl_alloc_bufsize(buf);
     assert_non_null(ptr);
     assert_ptr_equal(buf, ptr);
     assert_true(size >= 100);
 
-    expect_assert_failure(ck_maybe_grow(BUF_PARAMS, 0));
-
-    ck_free(ptr);
+    afl_free(ptr);
 
 }
 
+
 static void test_unchanged_size(void **state) {
     (void)state;
 
-    void *buf = ck_alloc(100);
-    size_t size = 100;
-    void *buf_before = buf;
-    void *buf_after = ck_maybe_grow(BUF_PARAMS, 100);
-    assert_ptr_equal(buf, buf_after);
+    // fake a realloc buf
+    void *actual_buf = create_fake_maybe_grow_of(100);
+
+    void *buf_before = actual_buf;
+    void *buf_after = afl_realloc(&actual_buf, 100);
+    if (unlikely(!buf_after)) { PFATAL("alloc"); }
+    assert_ptr_equal(actual_buf, buf_after);
     assert_ptr_equal(buf_after, buf_before);
-    ck_free(buf);
+    afl_free(buf_after);
 
 }
 
@@ -118,29 +166,35 @@ static void test_grow_multiple(void **state) {
     char *buf = NULL;
     size_t size = 0;
 
-    char *ptr = ck_maybe_grow(BUF_PARAMS, 100);
+    char *ptr = afl_realloc(VOID_BUF, 100);
+    if (unlikely(!ptr)) { PFATAL("alloc"); }
+    size = afl_alloc_bufsize(ptr);
     assert_ptr_equal(ptr, buf);
     assert_true(size >= 100);
-    assert_int_equal(size, next_pow2(size));
+    assert_int_equal(size, next_pow2(size) - AFL_ALLOC_SIZE_OFFSET);
     buf[50] = '5';
 
-    ptr = (char *)ck_maybe_grow(BUF_PARAMS, 1000);
+    ptr = (char *)afl_realloc(VOID_BUF, 1000);
+    if (unlikely(!ptr)) { PFATAL("alloc"); }
+    size = afl_alloc_bufsize(ptr);
     assert_ptr_equal(ptr, buf);
     assert_true(size >= 100);
-    assert_int_equal(size, next_pow2(size));
+    assert_int_equal(size, next_pow2(size) - AFL_ALLOC_SIZE_OFFSET);
     buf[500] = '5';
 
-    ptr = (char *)ck_maybe_grow(BUF_PARAMS, 10000);
+    ptr = (char *)afl_realloc(VOID_BUF, 10000);
+    if (unlikely(!ptr)) { PFATAL("alloc"); }
+    size = afl_alloc_bufsize(ptr);
     assert_ptr_equal(ptr, buf);
     assert_true(size >= 10000);
-    assert_int_equal(size, next_pow2(size));
+    assert_int_equal(size, next_pow2(size) - AFL_ALLOC_SIZE_OFFSET);
     buf[5000] = '5';
 
     assert_int_equal(buf[50], '5');
     assert_int_equal(buf[500], '5');
     assert_int_equal(buf[5000], '5');
 
-    ck_free(buf);
+    afl_free(buf);
 
 }
 
@@ -157,6 +211,7 @@ int main(int argc, char **argv) {
     (void)argv;
 
 	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_pow2),
 		cmocka_unit_test(test_null_allocs),
 		cmocka_unit_test(test_nonpow2_size),
 		cmocka_unit_test(test_zero_size),
-- 
cgit 1.4.1


From c0fd7ba6d17cfeff69ff650018240a6c33946464 Mon Sep 17 00:00:00 2001
From: Raphaël Hertzog <raphael@offensive-security.com>
Date: Fri, 28 Aug 2020 21:55:52 +0200
Subject: Pass CPPFLAGS to all calls of the C compiler

This variable is a standard way to inject options for the C
preprocessor. It's respected by the implicit rules of make
and autoconf/automake.

Debian sets this variable during package build to inject
`-D_FORTIFY_SOURCE=2` and we would like afl++ to respect it.

Note that this commit also adds $(CFLAGS) in the build of
afl-performance.o where it was missing. It might have been
on purpose but we want to keep CFLAGS everywhere as well
since Debian injects various options through that variable
(for hardening and reproducibility).
---
 GNUmakefile                         | 44 ++++++++++++++++++-------------------
 custom_mutators/radamsa/GNUmakefile |  8 +++----
 gcc_plugin/GNUmakefile              |  8 +++----
 libdislocator/Makefile              |  2 +-
 libtokencap/Makefile                |  2 +-
 llvm_mode/GNUmakefile               | 26 +++++++++++-----------
 6 files changed, 45 insertions(+), 45 deletions(-)

(limited to 'custom_mutators')

diff --git a/GNUmakefile b/GNUmakefile
index cae172dd..edabf995 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -368,78 +368,78 @@ ready:
 	@echo "[+] Everything seems to be working, ready to compile."
 
 afl-gcc: src/afl-gcc.c $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) src/$@.c -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) src/$@.c -o $@ $(LDFLAGS)
 	set -e; for i in afl-g++ afl-clang afl-clang++; do ln -sf afl-gcc $$i; done
 
 afl-as: src/afl-as.c include/afl-as.h $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) src/$@.c -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) src/$@.c -o $@ $(LDFLAGS)
 	ln -sf afl-as as
 
 src/afl-performance.o : $(COMM_HDR) src/afl-performance.c include/hash.h
-	$(CC) -Iinclude $(SPECIAL_PERFORMANCE) -O3 -fno-unroll-loops -c src/afl-performance.c -o src/afl-performance.o
+	$(CC) $(CFLAGS) $(CPPFLAGS) -Iinclude $(SPECIAL_PERFORMANCE) -O3 -fno-unroll-loops -c src/afl-performance.c -o src/afl-performance.o
 
 src/afl-common.o : $(COMM_HDR) src/afl-common.c include/common.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-common.c -o src/afl-common.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-common.c -o src/afl-common.o
 
 src/afl-forkserver.o : $(COMM_HDR) src/afl-forkserver.c include/forkserver.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-forkserver.c -o src/afl-forkserver.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-forkserver.c -o src/afl-forkserver.o
 
 src/afl-sharedmem.o : $(COMM_HDR) src/afl-sharedmem.c include/sharedmem.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-sharedmem.c -o src/afl-sharedmem.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-sharedmem.c -o src/afl-sharedmem.o
 
 afl-fuzz: $(COMM_HDR) include/afl-fuzz.h $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(PYFLAGS) $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) $(CPPFLAGS) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(PYFLAGS) $(LDFLAGS)
 
 afl-showmap: src/afl-showmap.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o -o $@ $(LDFLAGS)
 
 afl-tmin: src/afl-tmin.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(LDFLAGS)
 
 afl-analyze: src/afl-analyze.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o -o $@ $(LDFLAGS)
 
 afl-gotcpu: src/afl-gotcpu.c src/afl-common.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o -o $@ $(LDFLAGS)
 
 
 # document all mutations and only do one run (use with only one input file!)
 document: $(COMM_HDR) include/afl-fuzz.h $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-performance.o | test_x86
-	$(CC) -D_DEBUG=\"1\" -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.c src/afl-performance.o -o afl-fuzz-document $(PYFLAGS) $(LDFLAGS)
+	$(CC) -D_DEBUG=\"1\" -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) $(CPPFLAGS) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.c src/afl-performance.o -o afl-fuzz-document $(PYFLAGS) $(LDFLAGS)
 
 test/unittests/unit_maybe_alloc.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_maybe_alloc.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_maybe_alloc.c -o test/unittests/unit_maybe_alloc.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_maybe_alloc.c -o test/unittests/unit_maybe_alloc.o
 
 unit_maybe_alloc: test/unittests/unit_maybe_alloc.o
-	@$(CC) $(CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_maybe_alloc.o -o test/unittests/unit_maybe_alloc $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_maybe_alloc.o -o test/unittests/unit_maybe_alloc $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_maybe_alloc
 
 test/unittests/unit_hash.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_hash.c $(AFL_FUZZ_FILES) src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_hash.c -o test/unittests/unit_hash.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_hash.c -o test/unittests/unit_hash.o
 
 unit_hash: test/unittests/unit_hash.o src/afl-performance.o
-	@$(CC) $(CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_hash $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_hash $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_hash
 
 test/unittests/unit_rand.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_rand.c $(AFL_FUZZ_FILES) src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_rand.c -o test/unittests/unit_rand.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_rand.c -o test/unittests/unit_rand.o
 
 unit_rand: test/unittests/unit_rand.o src/afl-common.o src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_rand  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_rand  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_rand
 
 test/unittests/unit_list.o : $(COMM_HDR) include/list.h test/unittests/unit_list.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_list.c -o test/unittests/unit_list.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_list.c -o test/unittests/unit_list.o
 
 unit_list: test/unittests/unit_list.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_list.o -o test/unittests/unit_list  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_list.o -o test/unittests/unit_list  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_list
 
 test/unittests/unit_preallocable.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_preallocable.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_preallocable.c -o test/unittests/unit_preallocable.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_preallocable.c -o test/unittests/unit_preallocable.o
 
 unit_preallocable: test/unittests/unit_preallocable.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_preallocable.o -o test/unittests/unit_preallocable $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_preallocable.o -o test/unittests/unit_preallocable $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_preallocable
 
 unit_clean:
diff --git a/custom_mutators/radamsa/GNUmakefile b/custom_mutators/radamsa/GNUmakefile
index 60e43b17..3798b110 100644
--- a/custom_mutators/radamsa/GNUmakefile
+++ b/custom_mutators/radamsa/GNUmakefile
@@ -15,14 +15,14 @@ libradamsa.a: libradamsa.c radamsa.h
 	@echo " ***************************************************************"
 	@echo " * Compiling libradamsa, wait some minutes (~3 on modern CPUs) *"
 	@echo " ***************************************************************"
-	$(CC) -fPIC $(CFLAGS) -I $(CUR_DIR) -o libradamsa.a -c libradamsa.c
+	$(CC) -fPIC $(CFLAGS) $(CPPFLAGS) -I $(CUR_DIR) -o libradamsa.a -c libradamsa.c
 
 radamsa-mutator.so: radamsa-mutator.c libradamsa.a
-	$(CC) $(CFLAGS) -g -I. -I../../include -shared -fPIC -c radamsa-mutator.c
-	$(CC) $(CFLAGS) -shared -fPIC -o radamsa-mutator.so radamsa-mutator.o libradamsa.a
+	$(CC) $(CFLAGS) $(CPPFLAGS) -g -I. -I../../include -shared -fPIC -c radamsa-mutator.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC -o radamsa-mutator.so radamsa-mutator.o libradamsa.a
 
 test: libradamsa.a libradamsa-test.c
-	$(CC) $(CFLAGS) -I $(CUR_DIR) -o libradamsa-test libradamsa-test.c libradamsa.a
+	$(CC) $(CFLAGS) $(CPPFLAGS) -I $(CUR_DIR) -o libradamsa-test libradamsa-test.c libradamsa.a
 	./libradamsa-test libradamsa-test.c | grep "library test passed"
 	rm /tmp/libradamsa-*.fuzz
 
diff --git a/gcc_plugin/GNUmakefile b/gcc_plugin/GNUmakefile
index f10a6c1d..48625e31 100644
--- a/gcc_plugin/GNUmakefile
+++ b/gcc_plugin/GNUmakefile
@@ -111,21 +111,21 @@ test_deps:
 	@echo "[+] All set and ready to build."
 
 afl-common.o: ../src/afl-common.c
-	$(CC) $(CFLAGS) -c $< -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@ $(LDFLAGS)
 
 ../afl-gcc-fast: afl-gcc-fast.c afl-common.o | test_deps
-	$(CC) -DAFL_GCC_CC=\"$(CC)\" -DAFL_GCC_CXX=\"$(CXX)\" $(CFLAGS) $< afl-common.o -o $@ $(LDFLAGS)
+	$(CC) -DAFL_GCC_CC=\"$(CC)\" -DAFL_GCC_CXX=\"$(CXX)\" $(CFLAGS) $(CPPFLAGS) $< afl-common.o -o $@ $(LDFLAGS)
 	ln -sf afl-gcc-fast ../afl-g++-fast
 
 ../afl-gcc-pass.so: afl-gcc-pass.so.cc | test_deps
 	$(CXX) $(CXXEFLAGS) $(PLUGIN_FLAGS) -shared $< -o $@
 
 ../afl-gcc-rt.o: afl-gcc-rt.o.c | test_deps
-	$(CC) $(CFLAGS_SAFE) -fPIC -c $< -o $@
+	$(CC) $(CFLAGS_SAFE) $(CPPFLAGS) -fPIC -c $< -o $@
 
 test_build: $(PROGS)
 	@echo "[*] Testing the CC wrapper and instrumentation output..."
-	unset AFL_USE_ASAN AFL_USE_MSAN; AFL_QUIET=1 AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
+	unset AFL_USE_ASAN AFL_USE_MSAN; AFL_QUIET=1 AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) $(CPPFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
 #	unset AFL_USE_ASAN AFL_USE_MSAN;             AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
 	ASAN_OPTIONS=detect_leaks=0 ../afl-showmap -m none -q -o .test-instr0 ./test-instr </dev/null
 	echo 1 | ASAN_OPTIONS=detect_leaks=0 ../afl-showmap -m none -q -o .test-instr1 ./test-instr
diff --git a/libdislocator/Makefile b/libdislocator/Makefile
index f9c4cb65..1c2fcaa7 100644
--- a/libdislocator/Makefile
+++ b/libdislocator/Makefile
@@ -28,7 +28,7 @@ all: libdislocator.so
 
 VPATH = ..
 libdislocator.so: libdislocator.so.c ../config.h
-	$(CC) $(CFLAGS) -shared -fPIC libdislocator.so.c -o ../$@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC libdislocator.so.c -o ../$@ $(LDFLAGS)
 
 .NOTPARALLEL: clean
 
diff --git a/libtokencap/Makefile b/libtokencap/Makefile
index 244ee58f..00dbb954 100644
--- a/libtokencap/Makefile
+++ b/libtokencap/Makefile
@@ -70,7 +70,7 @@ all: $(TARGETS)
 
 VPATH = ..
 libtokencap.so: libtokencap.so.c ../config.h
-	$(CC) $(CFLAGS) -shared -fPIC $< -o ../$@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC $< -o ../$@ $(LDFLAGS)
 
 .NOTPARALLEL: clean
 
diff --git a/llvm_mode/GNUmakefile b/llvm_mode/GNUmakefile
index 702c2c08..1eb833eb 100644
--- a/llvm_mode/GNUmakefile
+++ b/llvm_mode/GNUmakefile
@@ -329,10 +329,10 @@ endif
 	@echo "[+] All set and ready to build."
 
 afl-common.o: ../src/afl-common.c
-	$(CC) $(CFLAGS) -c $< -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@ $(LDFLAGS)
 
 ../afl-clang-fast: afl-clang-fast.c afl-common.o | test_deps
-	$(CC) $(CLANG_CFL) $(CFLAGS) $< afl-common.o -o $@ $(LDFLAGS) -DCFLAGS_OPT=\"$(CFLAGS_OPT)\"
+	$(CC) $(CLANG_CFL) $(CFLAGS) $(CPPFLAGS) $< afl-common.o -o $@ $(LDFLAGS) -DCFLAGS_OPT=\"$(CFLAGS_OPT)\"
 	ln -sf afl-clang-fast ../afl-clang-fast++
 ifneq "$(AFL_CLANG_FLTO)" ""
 ifeq "$(LLVM_LTO)" "1"
@@ -342,7 +342,7 @@ endif
 endif
 
 afl-llvm-common.o: afl-llvm-common.cc afl-llvm-common.h
-	$(CXX) $(CFLAGS) `$(LLVM_CONFIG) --cxxflags` -fno-rtti -fPIC -std=$(LLVM_STDCXX) -c $< -o $@ 
+	$(CXX) $(CFLAGS) $(CPPFLAGS) `$(LLVM_CONFIG) --cxxflags` -fno-rtti -fPIC -std=$(LLVM_STDCXX) -c $< -o $@ 
 
 ../libLLVMInsTrim.so: LLVMInsTrim.so.cc MarkNodes.cc afl-llvm-common.o | test_deps
 	-$(CXX) $(CLANG_CPPFL) -DLLVMInsTrim_EXPORTS -fno-rtti -fPIC -std=$(LLVM_STDCXX) -shared $< MarkNodes.cc -o $@ $(CLANG_LFL) afl-llvm-common.o
@@ -360,7 +360,7 @@ endif
 
 ../afl-ld-lto: afl-ld-lto.c
 ifeq "$(LLVM_LTO)" "1"
-	$(CC) $(CFLAGS) $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) $< -o $@
 endif
 
 ../SanitizerCoverageLTO.so: SanitizerCoverageLTO.so.cc
@@ -371,9 +371,9 @@ endif
 ../afl-llvm-lto-instrumentation.so: afl-llvm-lto-instrumentation.so.cc afl-llvm-common.o
 ifeq "$(LLVM_LTO)" "1"
 	$(CXX) $(CLANG_CPPFL) -Wno-writable-strings -fno-rtti -fPIC -std=$(LLVM_STDCXX) -shared $< -o $@ $(CLANG_LFL) afl-llvm-common.o
-	$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto.o
-	@$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m64 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-64.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
-	@$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m32 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-32.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
+	$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto.o
+	@$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m64 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-64.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
+	@$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m32 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-32.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
 endif
 
 # laf
@@ -392,20 +392,20 @@ endif
 	$(CXX) $(CLANG_CPPFL) -shared $< -o $@ $(CLANG_LFL) afl-llvm-common.o
 
 document:
-	$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt.o
-	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -m32 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-32.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
-	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -m64 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-64.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt.o
+	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -m32 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-32.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -m64 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-64.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 ../afl-llvm-rt.o: afl-llvm-rt.o.c | test_deps
-	$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -fPIC -c $< -o $@
+	$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -fPIC -c $< -o $@
 
 ../afl-llvm-rt-32.o: afl-llvm-rt.o.c | test_deps
 	@printf "[*] Building 32-bit variant of the runtime (-m32)... "
-	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 ../afl-llvm-rt-64.o: afl-llvm-rt.o.c | test_deps
 	@printf "[*] Building 64-bit variant of the runtime (-m64)... "
-	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 test_build: $(PROGS)
 	@echo "[*] Testing the CC wrapper and instrumentation output..."
-- 
cgit 1.4.1


From 651ad18e217992a2befbceff1c44dd5d495ab9c2 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 1 Sep 2020 10:52:39 +0200
Subject: added the grammar mutator as a git submodule + documentation

---
 .gitmodules               |  6 +++++-
 custom_mutators/README.md | 16 ++++++++++++++++
 docs/Changelog.md         | 16 ++++++++++------
 3 files changed, 31 insertions(+), 7 deletions(-)

(limited to 'custom_mutators')

diff --git a/.gitmodules b/.gitmodules
index 80752342..a9c181da 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,7 @@
 [submodule "unicorn_mode/unicornafl"]
 	path = unicorn_mode/unicornafl
-	url = https://github.com/AFLplusplus/unicornafl.git
+	url = https://github.com/AFLplusplus/unicornafl
+
+[submodule "custom_mutators/Grammar-Mutator"]
+	path = custom_mutators/Grammar-Mutator
+	url = https://github.com/AFLplusplus/Grammar-Mutator
diff --git a/custom_mutators/README.md b/custom_mutators/README.md
index 3abcfef3..993ccaa1 100644
--- a/custom_mutators/README.md
+++ b/custom_mutators/README.md
@@ -3,6 +3,22 @@
 Custom mutators enhance and alter the mutation strategies of afl++.
 For further information and documentation on how to write your own, read [the docs](../docs/custom_mutators.md).
 
+## The afl++ Grammar Mutator
+
+If you use git to clone afl++, then the following will incorporate our
+excellent grammar custom mutator:
+```
+git submodule init
+git submodule update
+```
+
+otherwise just checkout the repository here with either
+`git clone https://github.com/AFLplusplus/Grammar-Mutator` or
+`svn co https://github.com/AFLplusplus/Grammar-Mutator`.
+
+Read the [Grammar-Mutator/README.md](Grammar-Mutator/README.md) on how to use
+it.
+
 ## Production-Ready Custom Mutators
 
 This directory holds ready to use custom mutators.
diff --git a/docs/Changelog.md b/docs/Changelog.md
index 72c8952c..d1ee9656 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -10,20 +10,24 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
 
 
 ### Version ++2.67d (develop)
+  - added the GSoC excellent afl++ grammar mutator by Shengtuo to our
+    custom_mutators/ (see custom_mutators/README.md) - or get it here:
+    https://github.com/AFLplusplus/Grammar-Mutator
   - a few QOL changes for Apple and its outdated gmake
   - afl-fuzz:
     - Fix for auto dictionary entries found during fuzzing to not throw out
       a -x dictionary
     - added total execs done to plot file
-    - AFL_MAX_DET_EXTRAS env variable added to control the amount of deterministic
-      dict entries without recompiling.
-    - AFL_FORKSRV_INIT_TMOUT env variable added to control the time to wait for
-      the forkserver to come up without the need to increase the overall timeout.
+    - AFL_MAX_DET_EXTRAS env variable added to control the amount of
+      deterministic dict entries without recompiling.
+    - AFL_FORKSRV_INIT_TMOUT env variable added to control the time to wait
+      for the forkserver to come up without the need to increase the overall
+      timeout.
     - bugfix for cmplog that results in a heap overflow based on target data
       (thanks to the magma team for reporting!)
   - custom mutators:
-    - added afl_custom_fuzz_count/fuzz_count function to allow specifying the 
-      number of fuzz attempts for custom_fuzz
+    - added afl_custom_fuzz_count/fuzz_count function to allow specifying
+      the number of fuzz attempts for custom_fuzz
   - llvm_mode:
     - Ported SanCov to LTO, and made it the default for LTO. better
       instrumentation locations
-- 
cgit 1.4.1


From a4cac3fce58c39e13ab120df7341b03781603b34 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Wed, 9 Sep 2020 17:49:43 +0200
Subject: new custom mutator: symcc

---
 custom_mutators/symcc/Makefile  |  14 +++
 custom_mutators/symcc/README.md |  15 +++
 custom_mutators/symcc/symcc.c   | 233 ++++++++++++++++++++++++++++++++++++++++
 docs/Changelog.md               |   1 +
 4 files changed, 263 insertions(+)
 create mode 100644 custom_mutators/symcc/Makefile
 create mode 100644 custom_mutators/symcc/README.md
 create mode 100644 custom_mutators/symcc/symcc.c

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/Makefile b/custom_mutators/symcc/Makefile
new file mode 100644
index 00000000..7e2f7b4d
--- /dev/null
+++ b/custom_mutators/symcc/Makefile
@@ -0,0 +1,14 @@
+
+ifdef DEBUG
+  CFLAGS += -DDEBUG
+endif
+
+all: symcc-mutator.so
+
+CFLAGS	+= -O3 -funroll-loops
+
+symcc-mutator.so: symcc.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -g -I../../include -shared -fPIC -o symcc-mutator.so symcc.c
+
+clean:
+	rm -f symcc-mutator.so *.o *~ core
diff --git a/custom_mutators/symcc/README.md b/custom_mutators/symcc/README.md
new file mode 100644
index 00000000..337362ae
--- /dev/null
+++ b/custom_mutators/symcc/README.md
@@ -0,0 +1,15 @@
+# custum mutator: symcc
+
+This uses the excellent symcc to find new paths into the target.
+
+To use this custom mutator follow the steps in the symcc repository 
+[https://github.com/eurecom-s3/symcc/](https://github.com/eurecom-s3/symcc/) 
+on how to build symcc and how to instrument a target binary (the same target
+that you are fuzzing).
+
+The target program compiled with symcc has to be pointed to with the
+`SYMCC_TARGET` environment variable.
+
+just type `make` to build this custom mutator.
+
+```SYMCC_TARGET=/prg/to/symcc/compiled/target AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/symcc/symcc-mutator.so afl-fuzz ...```
diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
new file mode 100644
index 00000000..d0572f4e
--- /dev/null
+++ b/custom_mutators/symcc/symcc.c
@@ -0,0 +1,233 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+#include "debug.h"
+#include "afl-fuzz.h"
+#include "common.h"
+
+afl_state_t *afl_struct;
+
+#ifdef DEBUG
+  #define DBG(x...) fprintf(stderr, x)
+#else
+  #define DBG(x...) {}
+#endif
+
+typedef struct my_mutator {
+
+  afl_state_t *afl;
+  u8 *         mutator_buf;
+  u8 *         out_dir;
+  u8 *         target;
+  uint32_t     seed;
+
+} my_mutator_t;
+
+my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
+
+  if (getenv("AFL_CUSTOM_MUTATOR_ONLY"))
+    FATAL("the symcc module cannot be used with AFL_CUSTOM_MUTATOR_ONLY.");
+
+  my_mutator_t *data = calloc(1, sizeof(my_mutator_t));
+  if (!data) {
+
+    perror("afl_custom_init alloc");
+    return NULL;
+
+  }
+
+  if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
+
+    perror("mutator_buf alloc");
+    return NULL;
+
+  }
+
+  if (!(data->target = getenv("SYMCC_TARGET")))
+    FATAL(
+        "SYMCC_TARGET not defined, this should point to the full path of the "
+        "symcc compiled binary.");
+
+  if (!(data->out_dir = getenv("SYMCC_OUTPUT_DIR"))) {
+
+    data->out_dir = alloc_printf("%s/symcc", afl->out_dir);
+    setenv("SYMCC_OUTPUT_DIR", data->out_dir, 1);
+
+  }
+
+  int pid = fork();
+
+  if (pid == -1) return NULL;
+
+  if (pid) pid = waitpid(pid, NULL, 0);
+
+  if (pid == 0) {
+
+    char *args[4];
+    args[0] = "/bin/rm";
+    args[1] = "-rf";
+    args[2] = data->out_dir;
+    args[3] = NULL;
+    execvp(args[0], args);
+    DBG("exec:FAIL\n");
+    exit(-1);
+
+  }
+
+  data->afl = afl;
+  data->seed = seed;
+  afl_struct = afl;
+
+  if (mkdir(data->out_dir, 0755))
+    PFATAL("Could not create directory %s", data->out_dir);
+  DBG("out_dir=%s, target=%s\n", data->out_dir, data->target);
+
+  return data;
+
+}
+
+/* When a new queue entry is added we run this input with the symcc
+   instrumented binary */
+void afl_custom_queue_new_entry(my_mutator_t * data,
+                                const uint8_t *filename_new_queue,
+                                const uint8_t *filename_orig_queue) {
+
+  int pid = fork();
+
+  if (pid == -1) return;
+
+  if (pid) pid = waitpid(pid, NULL, 0);
+
+  if (pid == 0) {
+
+    setenv("SYMCC_INPUT_FILE", afl_struct->fsrv.out_file, 1);
+
+    if (afl_struct->fsrv.use_stdin) {
+
+      u8 *fn = alloc_printf("%s/%s", afl_struct->out_dir, filename_new_queue);
+      int fd = open(fn, O_RDONLY);
+
+      if (fd >= 0) {
+
+        ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
+        close(fd);
+        DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
+        if (r <= 0) return;
+        close(0);
+        ck_write(0, data->mutator_buf, r, fn);
+        ck_free(fn);
+
+      }
+
+    }
+
+    DBG("exec=%s\n", data->target);
+    close(1);
+    close(2);
+    dup2(afl_struct->fsrv.dev_null_fd, 1);
+    dup2(afl_struct->fsrv.dev_null_fd, 2);
+    execvp(data->target, afl_struct->argv);
+    DBG("exec=FAIL\n");
+    exit(-1);
+
+  }
+
+}
+
+uint32_t afl_custom_fuzz_count(my_mutator_t *data, const u8 *buf,
+                               size_t buf_size) {
+
+  uint32_t        count = 0, i;
+  struct dirent **nl;
+  int32_t         items = scandir(data->out_dir, &nl, NULL, NULL);
+
+  if (items > 0) {
+
+    for (i = 0; i < (u32)items; ++i) {
+
+      struct stat st;
+      u8 *        fn = alloc_printf("%s/%s", data->out_dir, nl[i]->d_name);
+      DBG("test=%s\n", fn);
+      if (stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
+
+        DBG("found=%s\n", fn);
+        count++;
+
+      }
+
+      ck_free(fn);
+      free(nl[i]);
+
+    }
+
+    free(nl);
+
+  }
+
+  DBG("dir=%s, count=%u\n", data->out_dir, count);
+  return count;
+
+}
+
+/* here we actualy just read the files generated from symcc */
+size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
+                       u8 **out_buf, uint8_t *add_buf, size_t add_buf_size,
+                       size_t max_size) {
+
+  struct dirent **nl;
+  int32_t i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
+  size_t  size = 0;
+
+  if (items <= 0) return 0;
+
+  for (i = 0; i < (u32)items; ++i) {
+
+    struct stat st;
+    u8 *        fn = alloc_printf("%s/%s", data->out_dir, nl[i]->d_name);
+
+    if (done == 0) {
+
+      if (stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
+
+        int fd = open(fn, O_RDONLY);
+
+        if (fd >= 0) {
+
+          size = read(fd, data->mutator_buf, max_size);
+          *out_buf = data->mutator_buf;
+          close(fd);
+          done = 1;
+
+        }
+
+      }
+
+      unlink(fn);
+
+    }
+
+    ck_free(fn);
+    free(nl[i]);
+
+  }
+
+  free(nl);
+  DBG("FUZZ size=%lu\n", size);
+  return size;
+
+}
+
+/**
+ * Deinitialize everything
+ *
+ * @param data The data ptr from afl_custom_init
+ */
+void afl_custom_deinit(my_mutator_t *data) {
+
+  free(data->mutator_buf);
+  free(data);
+
+}
+
diff --git a/docs/Changelog.md b/docs/Changelog.md
index c42ab629..1e5c1b95 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -32,6 +32,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
       -x dictionary of string comparisons found during compilation
     - LTO autodict now also collects interesting cmp comparisons,
       std::string compare + find + ==, bcmp
+  - added a new custom mutator: symcc -> https://github.com/eurecom-s3/symcc/
 
 
 ### Version ++2.68c (release)
-- 
cgit 1.4.1


From 380051868a7531830d94d312f0f11b0e19e3284f Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Thu, 10 Sep 2020 15:26:46 +0200
Subject: add libfuzzer custom mutator, minor enhancements and fixes

---
 GNUmakefile                                        |    4 +-
 README.md                                          |    5 +
 custom_mutators/README.md                          |    4 +-
 custom_mutators/grammar_mutator/README.md          |    6 +
 .../grammar_mutator/build_grammar_mutator.sh       |   17 +
 custom_mutators/honggfuzz/Makefile                 |    6 +-
 custom_mutators/honggfuzz/README.md                |    4 +-
 custom_mutators/libfuzzer/FuzzerBuiltins.h         |   35 +
 custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h     |   72 ++
 custom_mutators/libfuzzer/FuzzerCommand.h          |  178 ++++
 custom_mutators/libfuzzer/FuzzerCorpus.h           |  581 ++++++++++
 custom_mutators/libfuzzer/FuzzerCrossOver.cpp      |   60 ++
 custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp  |  344 ++++++
 custom_mutators/libfuzzer/FuzzerDataFlowTrace.h    |  135 +++
 custom_mutators/libfuzzer/FuzzerDefs.h             |   75 ++
 custom_mutators/libfuzzer/FuzzerDictionary.h       |  118 ++
 custom_mutators/libfuzzer/FuzzerDriver.cpp         | 1122 ++++++++++++++++++++
 custom_mutators/libfuzzer/FuzzerExtFunctions.def   |   50 +
 custom_mutators/libfuzzer/FuzzerExtFunctions.h     |   34 +
 .../libfuzzer/FuzzerExtFunctionsDlsym.cpp          |   60 ++
 .../libfuzzer/FuzzerExtFunctionsWeak.cpp           |   63 ++
 .../libfuzzer/FuzzerExtFunctionsWindows.cpp        |   95 ++
 custom_mutators/libfuzzer/FuzzerExtraCounters.cpp  |   71 ++
 custom_mutators/libfuzzer/FuzzerFlags.def          |  197 ++++
 custom_mutators/libfuzzer/FuzzerFork.cpp           |  501 +++++++++
 custom_mutators/libfuzzer/FuzzerFork.h             |   24 +
 custom_mutators/libfuzzer/FuzzerIO.cpp             |  248 +++++
 custom_mutators/libfuzzer/FuzzerIO.h               |  112 ++
 custom_mutators/libfuzzer/FuzzerIOPosix.cpp        |  223 ++++
 custom_mutators/libfuzzer/FuzzerIOWindows.cpp      |  513 +++++++++
 custom_mutators/libfuzzer/FuzzerInterface.h        |   79 ++
 custom_mutators/libfuzzer/FuzzerInternal.h         |  173 +++
 custom_mutators/libfuzzer/FuzzerLoop.cpp           | 1087 +++++++++++++++++++
 custom_mutators/libfuzzer/FuzzerMerge.cpp          |  485 +++++++++
 custom_mutators/libfuzzer/FuzzerMerge.h            |   87 ++
 custom_mutators/libfuzzer/FuzzerMutate.cpp         |  720 +++++++++++++
 custom_mutators/libfuzzer/FuzzerMutate.h           |  158 +++
 custom_mutators/libfuzzer/FuzzerOptions.h          |   90 ++
 custom_mutators/libfuzzer/FuzzerPlatform.h         |  163 +++
 custom_mutators/libfuzzer/FuzzerRandom.h           |   38 +
 custom_mutators/libfuzzer/FuzzerSHA1.cpp           |  269 +++++
 custom_mutators/libfuzzer/FuzzerSHA1.h             |   32 +
 custom_mutators/libfuzzer/FuzzerTracePC.cpp        |  819 ++++++++++++++
 custom_mutators/libfuzzer/FuzzerTracePC.h          |  291 +++++
 custom_mutators/libfuzzer/FuzzerUtil.cpp           |  314 ++++++
 custom_mutators/libfuzzer/FuzzerUtil.h             |  117 ++
 custom_mutators/libfuzzer/FuzzerUtilDarwin.cpp     |  205 ++++
 custom_mutators/libfuzzer/FuzzerUtilFuchsia.cpp    |  658 ++++++++++++
 custom_mutators/libfuzzer/FuzzerUtilLinux.cpp      |   43 +
 custom_mutators/libfuzzer/FuzzerUtilPosix.cpp      |  239 +++++
 custom_mutators/libfuzzer/FuzzerUtilWindows.cpp    |  279 +++++
 custom_mutators/libfuzzer/FuzzerValueBitMap.h      |   73 ++
 custom_mutators/libfuzzer/Makefile                 |   81 ++
 custom_mutators/libfuzzer/README.md                |   24 +
 custom_mutators/libfuzzer/libfuzzer.cpp            |  147 +++
 custom_mutators/libfuzzer/libfuzzer.inc            |   36 +
 custom_mutators/symcc/symcc.c                      |    7 +-
 docs/Changelog.md                                  |    2 +
 include/afl-prealloc.h                             |    2 +-
 include/alloc-inl.h                                |    4 +-
 include/list.h                                     |    1 +
 src/afl-cc.c                                       |    8 +-
 62 files changed, 11668 insertions(+), 20 deletions(-)
 create mode 100644 custom_mutators/grammar_mutator/README.md
 create mode 100755 custom_mutators/grammar_mutator/build_grammar_mutator.sh
 create mode 100644 custom_mutators/libfuzzer/FuzzerBuiltins.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerCommand.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerCorpus.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerCrossOver.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerDataFlowTrace.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerDefs.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerDictionary.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerDriver.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtFunctions.def
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtFunctions.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerExtraCounters.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerFlags.def
 create mode 100644 custom_mutators/libfuzzer/FuzzerFork.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerFork.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerIO.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerIO.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerIOPosix.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerIOWindows.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerInterface.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerInternal.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerLoop.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerMerge.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerMerge.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerMutate.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerMutate.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerOptions.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerPlatform.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerRandom.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerSHA1.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerSHA1.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerTracePC.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerTracePC.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtil.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtil.h
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtilDarwin.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtilFuchsia.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtilLinux.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtilPosix.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerUtilWindows.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerValueBitMap.h
 create mode 100644 custom_mutators/libfuzzer/Makefile
 create mode 100644 custom_mutators/libfuzzer/README.md
 create mode 100644 custom_mutators/libfuzzer/libfuzzer.cpp
 create mode 100644 custom_mutators/libfuzzer/libfuzzer.inc

(limited to 'custom_mutators')

diff --git a/GNUmakefile b/GNUmakefile
index b9a017d2..d47f8247 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -465,9 +465,9 @@ code-format:
 	./.custom-format.py -i instrumentation/*.h
 	./.custom-format.py -i instrumentation/*.cc
 	./.custom-format.py -i instrumentation/*.c
-	./.custom-format.py -i custom_mutators/*/*.c
+	./.custom-format.py -i custom_mutators/*/*.c*
 	@#./.custom-format.py -i custom_mutators/*/*.h # destroys input.h :-(
-	./.custom-format.py -i examples/*/*.c
+	./.custom-format.py -i examples/*/*.c*
 	./.custom-format.py -i examples/*/*.h
 	./.custom-format.py -i test/*.c
 	./.custom-format.py -i qemu_mode/libcompcov/*.c
diff --git a/README.md b/README.md
index 2fc9d807..c2108e93 100644
--- a/README.md
+++ b/README.md
@@ -379,6 +379,11 @@ How to do this is described below.
 
 Then build the target. (Usually with `make`)
 
+**NOTE**: sometimes configure and build systems are fickle and do not like
+stderr output (and think this means a test failure) - which is something
+afl++ like to do to show statistics. It is recommended to disable them via
+`export AFL_QUIET=1`.
+
 ##### configure
 
 For `configure` build systems this is usually done by:
diff --git a/custom_mutators/README.md b/custom_mutators/README.md
index 993ccaa1..0cf52746 100644
--- a/custom_mutators/README.md
+++ b/custom_mutators/README.md
@@ -12,9 +12,7 @@ git submodule init
 git submodule update
 ```
 
-otherwise just checkout the repository here with either
-`git clone https://github.com/AFLplusplus/Grammar-Mutator` or
-`svn co https://github.com/AFLplusplus/Grammar-Mutator`.
+otherwise just use the script: `grammar_mutator/build_grammar_mutator.sh`
 
 Read the [Grammar-Mutator/README.md](Grammar-Mutator/README.md) on how to use
 it.
diff --git a/custom_mutators/grammar_mutator/README.md b/custom_mutators/grammar_mutator/README.md
new file mode 100644
index 00000000..a015744c
--- /dev/null
+++ b/custom_mutators/grammar_mutator/README.md
@@ -0,0 +1,6 @@
+# Grammar-Mutator
+
+This is just a stub directory that will clone the real grammar mutator
+directory.
+
+Execute `./build_grammar_mutator.sh` to set everything up.
diff --git a/custom_mutators/grammar_mutator/build_grammar_mutator.sh b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
new file mode 100755
index 00000000..f3f5e164
--- /dev/null
+++ b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+test -d Grammar-Mutator || git clone --depth=1 https://github.com/AFLplusplus/Grammar-Mutator
+
+cd Grammar-Mutator || exit 1
+git stash ; git pull
+
+wget -c https://www.antlr.org/download/antlr-4.8-complete.jar
+
+echo
+echo
+echo "All successfully prepared!"
+echo "To build for your grammar just do:"
+echo "  cd Grammar_Mutator"
+echo "  make GRAMMAR_FILE=/path/to/your/grammar"
+echo "You will find a JSON and RUBY grammar in Grammar_Mutator/grammars to play with."
+echo
diff --git a/custom_mutators/honggfuzz/Makefile b/custom_mutators/honggfuzz/Makefile
index 1d46f163..5c2fcddb 100644
--- a/custom_mutators/honggfuzz/Makefile
+++ b/custom_mutators/honggfuzz/Makefile
@@ -1,10 +1,10 @@
 
 CFLAGS = -O3 -funroll-loops -fPIC -Wl,-Bsymbolic
 
-all: honggfuzz.so
+all: honggfuzz-mutator.so
 
-honggfuzz.so:	honggfuzz.c input.h mangle.c ../../src/afl-performance.c
-	$(CC) $(CFLAGS) -I../../include -I. -shared -o honggfuzz.so honggfuzz.c mangle.c ../../src/afl-performance.c
+honggfuzz-mutator.so:	honggfuzz.c input.h mangle.c ../../src/afl-performance.c
+	$(CC) $(CFLAGS) -I../../include -I. -shared -o honggfuzz-mutator.so honggfuzz.c mangle.c ../../src/afl-performance.c
 
 update:
 	@# seriously? --unlink is a dud option? sigh ...
diff --git a/custom_mutators/honggfuzz/README.md b/custom_mutators/honggfuzz/README.md
index 8824976f..e1cab281 100644
--- a/custom_mutators/honggfuzz/README.md
+++ b/custom_mutators/honggfuzz/README.md
@@ -1,12 +1,12 @@
 # custum mutator: honggfuzz mangle
 
-this is the very good honggfuzz mutator in mangle.c as a custom mutator
+this is the honggfuzz mutator in mangle.c as a custom mutator
 module for afl++. It is the original mangle.c, mangle.h and honggfuzz.h
 with a lot of mocking around it :-)
 
 just type `make` to build
 
-```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/honggfuzz/honggfuzz.so afl-fuzz ...```
+```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/honggfuzz/honggfuzz-mutator.so afl-fuzz ...```
 
 > Original repository: https://github.com/google/honggfuzz
 > Source commit: d0fbcb0373c32436b8fb922e6937da93b17291f5
diff --git a/custom_mutators/libfuzzer/FuzzerBuiltins.h b/custom_mutators/libfuzzer/FuzzerBuiltins.h
new file mode 100644
index 00000000..4c0ada82
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerBuiltins.h
@@ -0,0 +1,35 @@
+//===- FuzzerBuiltins.h - Internal header for builtins ----------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Wrapper functions and marcos around builtin functions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_BUILTINS_H
+#define LLVM_FUZZER_BUILTINS_H
+
+#include "FuzzerPlatform.h"
+
+#if !LIBFUZZER_MSVC
+#include <cstdint>
+
+#define GET_CALLER_PC() __builtin_return_address(0)
+
+namespace fuzzer {
+
+inline uint8_t  Bswap(uint8_t x)  { return x; }
+inline uint16_t Bswap(uint16_t x) { return __builtin_bswap16(x); }
+inline uint32_t Bswap(uint32_t x) { return __builtin_bswap32(x); }
+inline uint64_t Bswap(uint64_t x) { return __builtin_bswap64(x); }
+
+inline uint32_t Clzll(unsigned long long X) { return __builtin_clzll(X); }
+inline uint32_t Clz(unsigned long long X) { return __builtin_clz(X); }
+inline int Popcountll(unsigned long long X) { return __builtin_popcountll(X); }
+
+}  // namespace fuzzer
+
+#endif  // !LIBFUZZER_MSVC
+#endif  // LLVM_FUZZER_BUILTINS_H
diff --git a/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h b/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
new file mode 100644
index 00000000..c5bec978
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
@@ -0,0 +1,72 @@
+//===- FuzzerBuiltinsMSVC.h - Internal header for builtins ------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Wrapper functions and marcos that use intrinsics instead of builtin functions
+// which cannot be compiled by MSVC.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_BUILTINS_MSVC_H
+#define LLVM_FUZZER_BUILTINS_MSVC_H
+
+#include "FuzzerPlatform.h"
+
+#if LIBFUZZER_MSVC
+#include <intrin.h>
+#include <cstdint>
+#include <cstdlib>
+
+// __builtin_return_address() cannot be compiled with MSVC. Use the equivalent
+// from <intrin.h>
+#define GET_CALLER_PC() _ReturnAddress()
+
+namespace fuzzer {
+
+inline uint8_t  Bswap(uint8_t x)  { return x; }
+// Use alternatives to __builtin functions from <stdlib.h> and <intrin.h> on
+// Windows since the builtins are not supported by MSVC.
+inline uint16_t Bswap(uint16_t x) { return _byteswap_ushort(x); }
+inline uint32_t Bswap(uint32_t x) { return _byteswap_ulong(x); }
+inline uint64_t Bswap(uint64_t x) { return _byteswap_uint64(x); }
+
+// The functions below were mostly copied from
+// compiler-rt/lib/builtins/int_lib.h which defines the __builtin functions used
+// outside of Windows.
+inline uint32_t Clzll(uint64_t X) {
+  unsigned long LeadZeroIdx = 0;
+
+#if !defined(_M_ARM) && !defined(_M_X64)
+  // Scan the high 32 bits.
+  if (_BitScanReverse(&LeadZeroIdx, static_cast<unsigned long>(X >> 32)))
+    return static_cast<int>(63 - (LeadZeroIdx + 32)); // Create a bit offset from the MSB.
+  // Scan the low 32 bits.
+  if (_BitScanReverse(&LeadZeroIdx, static_cast<unsigned long>(X)))
+    return static_cast<int>(63 - LeadZeroIdx);
+
+#else
+  if (_BitScanReverse64(&LeadZeroIdx, X)) return 63 - LeadZeroIdx;
+#endif
+  return 64;
+}
+
+inline uint32_t Clz(uint32_t X) {
+  unsigned long LeadZeroIdx = 0;
+  if (_BitScanReverse(&LeadZeroIdx, X)) return 31 - LeadZeroIdx;
+  return 32;
+}
+
+inline int Popcountll(unsigned long long X) {
+#if !defined(_M_ARM) && !defined(_M_X64)
+  return __popcnt(X) + __popcnt(X >> 32);
+#else
+  return __popcnt64(X);
+#endif
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZER_MSVC
+#endif  // LLVM_FUZZER_BUILTINS_MSVC_H
diff --git a/custom_mutators/libfuzzer/FuzzerCommand.h b/custom_mutators/libfuzzer/FuzzerCommand.h
new file mode 100644
index 00000000..87308864
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerCommand.h
@@ -0,0 +1,178 @@
+//===- FuzzerCommand.h - Interface representing a process -------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// FuzzerCommand represents a command to run in a subprocess.  It allows callers
+// to manage command line arguments and output and error streams.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_COMMAND_H
+#define LLVM_FUZZER_COMMAND_H
+
+#include "FuzzerDefs.h"
+#include "FuzzerIO.h"
+
+#include <algorithm>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace fuzzer {
+
+class Command final {
+public:
+  // This command line flag is used to indicate that the remaining command line
+  // is immutable, meaning this flag effectively marks the end of the mutable
+  // argument list.
+  static inline const char *ignoreRemainingArgs() {
+    return "-ignore_remaining_args=1";
+  }
+
+  Command() : CombinedOutAndErr(false) {}
+
+  explicit Command(const Vector<std::string> &ArgsToAdd)
+      : Args(ArgsToAdd), CombinedOutAndErr(false) {}
+
+  explicit Command(const Command &Other)
+      : Args(Other.Args), CombinedOutAndErr(Other.CombinedOutAndErr),
+        OutputFile(Other.OutputFile) {}
+
+  Command &operator=(const Command &Other) {
+    Args = Other.Args;
+    CombinedOutAndErr = Other.CombinedOutAndErr;
+    OutputFile = Other.OutputFile;
+    return *this;
+  }
+
+  ~Command() {}
+
+  // Returns true if the given Arg is present in Args.  Only checks up to
+  // "-ignore_remaining_args=1".
+  bool hasArgument(const std::string &Arg) const {
+    auto i = endMutableArgs();
+    return std::find(Args.begin(), i, Arg) != i;
+  }
+
+  // Gets all of the current command line arguments, **including** those after
+  // "-ignore-remaining-args=1".
+  const Vector<std::string> &getArguments() const { return Args; }
+
+  // Adds the given argument before "-ignore_remaining_args=1", or at the end
+  // if that flag isn't present.
+  void addArgument(const std::string &Arg) {
+    Args.insert(endMutableArgs(), Arg);
+  }
+
+  // Adds all given arguments before "-ignore_remaining_args=1", or at the end
+  // if that flag isn't present.
+  void addArguments(const Vector<std::string> &ArgsToAdd) {
+    Args.insert(endMutableArgs(), ArgsToAdd.begin(), ArgsToAdd.end());
+  }
+
+  // Removes the given argument from the command argument list.  Ignores any
+  // occurrences after "-ignore_remaining_args=1", if present.
+  void removeArgument(const std::string &Arg) {
+    auto i = endMutableArgs();
+    Args.erase(std::remove(Args.begin(), i, Arg), i);
+  }
+
+  // Like hasArgument, but checks for "-[Flag]=...".
+  bool hasFlag(const std::string &Flag) const {
+    std::string Arg("-" + Flag + "=");
+    auto IsMatch = [&](const std::string &Other) {
+      return Arg.compare(0, std::string::npos, Other, 0, Arg.length()) == 0;
+    };
+    return std::any_of(Args.begin(), endMutableArgs(), IsMatch);
+  }
+
+  // Returns the value of the first instance of a given flag, or an empty string
+  // if the flag isn't present.  Ignores any occurrences after
+  // "-ignore_remaining_args=1", if present.
+  std::string getFlagValue(const std::string &Flag) const {
+    std::string Arg("-" + Flag + "=");
+    auto IsMatch = [&](const std::string &Other) {
+      return Arg.compare(0, std::string::npos, Other, 0, Arg.length()) == 0;
+    };
+    auto i = endMutableArgs();
+    auto j = std::find_if(Args.begin(), i, IsMatch);
+    std::string result;
+    if (j != i) {
+      result = j->substr(Arg.length());
+    }
+    return result;
+  }
+
+  // Like AddArgument, but adds "-[Flag]=[Value]".
+  void addFlag(const std::string &Flag, const std::string &Value) {
+    addArgument("-" + Flag + "=" + Value);
+  }
+
+  // Like RemoveArgument, but removes "-[Flag]=...".
+  void removeFlag(const std::string &Flag) {
+    std::string Arg("-" + Flag + "=");
+    auto IsMatch = [&](const std::string &Other) {
+      return Arg.compare(0, std::string::npos, Other, 0, Arg.length()) == 0;
+    };
+    auto i = endMutableArgs();
+    Args.erase(std::remove_if(Args.begin(), i, IsMatch), i);
+  }
+
+  // Returns whether the command's stdout is being written to an output file.
+  bool hasOutputFile() const { return !OutputFile.empty(); }
+
+  // Returns the currently set output file.
+  const std::string &getOutputFile() const { return OutputFile; }
+
+  // Configures the command to redirect its output to the name file.
+  void setOutputFile(const std::string &FileName) { OutputFile = FileName; }
+
+  // Returns whether the command's stderr is redirected to stdout.
+  bool isOutAndErrCombined() const { return CombinedOutAndErr; }
+
+  // Sets whether to redirect the command's stderr to its stdout.
+  void combineOutAndErr(bool combine = true) { CombinedOutAndErr = combine; }
+
+  // Returns a string representation of the command.  On many systems this will
+  // be the equivalent command line.
+  std::string toString() const {
+    std::stringstream SS;
+    for (auto arg : getArguments())
+      SS << arg << " ";
+    if (hasOutputFile())
+      SS << ">" << getOutputFile() << " ";
+    if (isOutAndErrCombined())
+      SS << "2>&1 ";
+    std::string result = SS.str();
+    if (!result.empty())
+      result = result.substr(0, result.length() - 1);
+    return result;
+  }
+
+private:
+  Command(Command &&Other) = delete;
+  Command &operator=(Command &&Other) = delete;
+
+  Vector<std::string>::iterator endMutableArgs() {
+    return std::find(Args.begin(), Args.end(), ignoreRemainingArgs());
+  }
+
+  Vector<std::string>::const_iterator endMutableArgs() const {
+    return std::find(Args.begin(), Args.end(), ignoreRemainingArgs());
+  }
+
+  // The command arguments.  Args[0] is the command name.
+  Vector<std::string> Args;
+
+  // True indicates stderr is redirected to stdout.
+  bool CombinedOutAndErr;
+
+  // If not empty, stdout is redirected to the named file.
+  std::string OutputFile;
+};
+
+} // namespace fuzzer
+
+#endif // LLVM_FUZZER_COMMAND_H
diff --git a/custom_mutators/libfuzzer/FuzzerCorpus.h b/custom_mutators/libfuzzer/FuzzerCorpus.h
new file mode 100644
index 00000000..daea4f52
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerCorpus.h
@@ -0,0 +1,581 @@
+//===- FuzzerCorpus.h - Internal header for the Fuzzer ----------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::InputCorpus
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_CORPUS
+#define LLVM_FUZZER_CORPUS
+
+#include "FuzzerDataFlowTrace.h"
+#include "FuzzerDefs.h"
+#include "FuzzerIO.h"
+#include "FuzzerRandom.h"
+#include "FuzzerSHA1.h"
+#include "FuzzerTracePC.h"
+#include <algorithm>
+#include <chrono>
+#include <numeric>
+#include <random>
+#include <unordered_set>
+
+namespace fuzzer {
+
+struct InputInfo {
+  Unit U;  // The actual input data.
+  std::chrono::microseconds TimeOfUnit;
+  uint8_t Sha1[kSHA1NumBytes];  // Checksum.
+  // Number of features that this input has and no smaller input has.
+  size_t NumFeatures = 0;
+  size_t Tmp = 0; // Used by ValidateFeatureSet.
+  // Stats.
+  size_t NumExecutedMutations = 0;
+  size_t NumSuccessfullMutations = 0;
+  bool NeverReduce = false;
+  bool MayDeleteFile = false;
+  bool Reduced = false;
+  bool HasFocusFunction = false;
+  Vector<uint32_t> UniqFeatureSet;
+  Vector<uint8_t> DataFlowTraceForFocusFunction;
+  // Power schedule.
+  bool NeedsEnergyUpdate = false;
+  double Energy = 0.0;
+  size_t SumIncidence = 0;
+  Vector<std::pair<uint32_t, uint16_t>> FeatureFreqs;
+
+  // Delete feature Idx and its frequency from FeatureFreqs.
+  bool DeleteFeatureFreq(uint32_t Idx) {
+    if (FeatureFreqs.empty())
+      return false;
+
+    // Binary search over local feature frequencies sorted by index.
+    auto Lower = std::lower_bound(FeatureFreqs.begin(), FeatureFreqs.end(),
+                                  std::pair<uint32_t, uint16_t>(Idx, 0));
+
+    if (Lower != FeatureFreqs.end() && Lower->first == Idx) {
+      FeatureFreqs.erase(Lower);
+      return true;
+    }
+    return false;
+  }
+
+  // Assign more energy to a high-entropy seed, i.e., that reveals more
+  // information about the globally rare features in the neighborhood of the
+  // seed. Since we do not know the entropy of a seed that has never been
+  // executed we assign fresh seeds maximum entropy and let II->Energy approach
+  // the true entropy from above. If ScalePerExecTime is true, the computed
+  // entropy is scaled based on how fast this input executes compared to the
+  // average execution time of inputs. The faster an input executes, the more
+  // energy gets assigned to the input.
+  void UpdateEnergy(size_t GlobalNumberOfFeatures, bool ScalePerExecTime,
+                    std::chrono::microseconds AverageUnitExecutionTime) {
+    Energy = 0.0;
+    SumIncidence = 0;
+
+    // Apply add-one smoothing to locally discovered features.
+    for (auto F : FeatureFreqs) {
+      size_t LocalIncidence = F.second + 1;
+      Energy -= LocalIncidence * logl(LocalIncidence);
+      SumIncidence += LocalIncidence;
+    }
+
+    // Apply add-one smoothing to locally undiscovered features.
+    //   PreciseEnergy -= 0; // since logl(1.0) == 0)
+    SumIncidence += (GlobalNumberOfFeatures - FeatureFreqs.size());
+
+    // Add a single locally abundant feature apply add-one smoothing.
+    size_t AbdIncidence = NumExecutedMutations + 1;
+    Energy -= AbdIncidence * logl(AbdIncidence);
+    SumIncidence += AbdIncidence;
+
+    // Normalize.
+    if (SumIncidence != 0)
+      Energy = (Energy / SumIncidence) + logl(SumIncidence);
+
+    if (ScalePerExecTime) {
+      // Scaling to favor inputs with lower execution time.
+      uint32_t PerfScore = 100;
+      if (TimeOfUnit.count() > AverageUnitExecutionTime.count() * 10)
+        PerfScore = 10;
+      else if (TimeOfUnit.count() > AverageUnitExecutionTime.count() * 4)
+        PerfScore = 25;
+      else if (TimeOfUnit.count() > AverageUnitExecutionTime.count() * 2)
+        PerfScore = 50;
+      else if (TimeOfUnit.count() * 3 > AverageUnitExecutionTime.count() * 4)
+        PerfScore = 75;
+      else if (TimeOfUnit.count() * 4 < AverageUnitExecutionTime.count())
+        PerfScore = 300;
+      else if (TimeOfUnit.count() * 3 < AverageUnitExecutionTime.count())
+        PerfScore = 200;
+      else if (TimeOfUnit.count() * 2 < AverageUnitExecutionTime.count())
+        PerfScore = 150;
+
+      Energy *= PerfScore;
+    }
+  }
+
+  // Increment the frequency of the feature Idx.
+  void UpdateFeatureFrequency(uint32_t Idx) {
+    NeedsEnergyUpdate = true;
+
+    // The local feature frequencies is an ordered vector of pairs.
+    // If there are no local feature frequencies, push_back preserves order.
+    // Set the feature frequency for feature Idx32 to 1.
+    if (FeatureFreqs.empty()) {
+      FeatureFreqs.push_back(std::pair<uint32_t, uint16_t>(Idx, 1));
+      return;
+    }
+
+    // Binary search over local feature frequencies sorted by index.
+    auto Lower = std::lower_bound(FeatureFreqs.begin(), FeatureFreqs.end(),
+                                  std::pair<uint32_t, uint16_t>(Idx, 0));
+
+    // If feature Idx32 already exists, increment its frequency.
+    // Otherwise, insert a new pair right after the next lower index.
+    if (Lower != FeatureFreqs.end() && Lower->first == Idx) {
+      Lower->second++;
+    } else {
+      FeatureFreqs.insert(Lower, std::pair<uint32_t, uint16_t>(Idx, 1));
+    }
+  }
+};
+
+struct EntropicOptions {
+  bool Enabled;
+  size_t NumberOfRarestFeatures;
+  size_t FeatureFrequencyThreshold;
+  bool ScalePerExecTime;
+};
+
+class InputCorpus {
+  static const uint32_t kFeatureSetSize = 1 << 21;
+  static const uint8_t kMaxMutationFactor = 20;
+  static const size_t kSparseEnergyUpdates = 100;
+
+  size_t NumExecutedMutations = 0;
+
+  EntropicOptions Entropic;
+
+public:
+  InputCorpus(const std::string &OutputCorpus, EntropicOptions Entropic)
+      : Entropic(Entropic), OutputCorpus(OutputCorpus) {
+    memset(InputSizesPerFeature, 0, sizeof(InputSizesPerFeature));
+    memset(SmallestElementPerFeature, 0, sizeof(SmallestElementPerFeature));
+  }
+  ~InputCorpus() {
+    for (auto II : Inputs)
+      delete II;
+  }
+  size_t size() const { return Inputs.size(); }
+  size_t SizeInBytes() const {
+    size_t Res = 0;
+    for (auto II : Inputs)
+      Res += II->U.size();
+    return Res;
+  }
+  size_t NumActiveUnits() const {
+    size_t Res = 0;
+    for (auto II : Inputs)
+      Res += !II->U.empty();
+    return Res;
+  }
+  size_t MaxInputSize() const {
+    size_t Res = 0;
+    for (auto II : Inputs)
+        Res = std::max(Res, II->U.size());
+    return Res;
+  }
+  void IncrementNumExecutedMutations() { NumExecutedMutations++; }
+
+  size_t NumInputsThatTouchFocusFunction() {
+    return std::count_if(Inputs.begin(), Inputs.end(), [](const InputInfo *II) {
+      return II->HasFocusFunction;
+    });
+  }
+
+  size_t NumInputsWithDataFlowTrace() {
+    return std::count_if(Inputs.begin(), Inputs.end(), [](const InputInfo *II) {
+      return !II->DataFlowTraceForFocusFunction.empty();
+    });
+  }
+
+  bool empty() const { return Inputs.empty(); }
+  const Unit &operator[] (size_t Idx) const { return Inputs[Idx]->U; }
+  InputInfo *AddToCorpus(const Unit &U, size_t NumFeatures, bool MayDeleteFile,
+                         bool HasFocusFunction, bool NeverReduce,
+                         std::chrono::microseconds TimeOfUnit,
+                         const Vector<uint32_t> &FeatureSet,
+                         const DataFlowTrace &DFT, const InputInfo *BaseII) {
+    assert(!U.empty());
+    if (FeatureDebug)
+      Printf("ADD_TO_CORPUS %zd NF %zd\n", Inputs.size(), NumFeatures);
+    Inputs.push_back(new InputInfo());
+    InputInfo &II = *Inputs.back();
+    II.U = U;
+    II.NumFeatures = NumFeatures;
+    II.NeverReduce = NeverReduce;
+    II.TimeOfUnit = TimeOfUnit;
+    II.MayDeleteFile = MayDeleteFile;
+    II.UniqFeatureSet = FeatureSet;
+    II.HasFocusFunction = HasFocusFunction;
+    // Assign maximal energy to the new seed.
+    II.Energy = RareFeatures.empty() ? 1.0 : log(RareFeatures.size());
+    II.SumIncidence = RareFeatures.size();
+    II.NeedsEnergyUpdate = false;
+    std::sort(II.UniqFeatureSet.begin(), II.UniqFeatureSet.end());
+    ComputeSHA1(U.data(), U.size(), II.Sha1);
+    auto Sha1Str = Sha1ToString(II.Sha1);
+    Hashes.insert(Sha1Str);
+    if (HasFocusFunction)
+      if (auto V = DFT.Get(Sha1Str))
+        II.DataFlowTraceForFocusFunction = *V;
+    // This is a gross heuristic.
+    // Ideally, when we add an element to a corpus we need to know its DFT.
+    // But if we don't, we'll use the DFT of its base input.
+    if (II.DataFlowTraceForFocusFunction.empty() && BaseII)
+      II.DataFlowTraceForFocusFunction = BaseII->DataFlowTraceForFocusFunction;
+    DistributionNeedsUpdate = true;
+    PrintCorpus();
+    // ValidateFeatureSet();
+    return &II;
+  }
+
+  // Debug-only
+  void PrintUnit(const Unit &U) {
+    if (!FeatureDebug) return;
+    for (uint8_t C : U) {
+      if (C != 'F' && C != 'U' && C != 'Z')
+        C = '.';
+      Printf("%c", C);
+    }
+  }
+
+  // Debug-only
+  void PrintFeatureSet(const Vector<uint32_t> &FeatureSet) {
+    if (!FeatureDebug) return;
+    Printf("{");
+    for (uint32_t Feature: FeatureSet)
+      Printf("%u,", Feature);
+    Printf("}");
+  }
+
+  // Debug-only
+  void PrintCorpus() {
+    if (!FeatureDebug) return;
+    Printf("======= CORPUS:\n");
+    int i = 0;
+    for (auto II : Inputs) {
+      if (std::find(II->U.begin(), II->U.end(), 'F') != II->U.end()) {
+        Printf("[%2d] ", i);
+        Printf("%s sz=%zd ", Sha1ToString(II->Sha1).c_str(), II->U.size());
+        PrintUnit(II->U);
+        Printf(" ");
+        PrintFeatureSet(II->UniqFeatureSet);
+        Printf("\n");
+      }
+      i++;
+    }
+  }
+
+  void Replace(InputInfo *II, const Unit &U) {
+    assert(II->U.size() > U.size());
+    Hashes.erase(Sha1ToString(II->Sha1));
+    DeleteFile(*II);
+    ComputeSHA1(U.data(), U.size(), II->Sha1);
+    Hashes.insert(Sha1ToString(II->Sha1));
+    II->U = U;
+    II->Reduced = true;
+    DistributionNeedsUpdate = true;
+  }
+
+  bool HasUnit(const Unit &U) { return Hashes.count(Hash(U)); }
+  bool HasUnit(const std::string &H) { return Hashes.count(H); }
+  InputInfo &ChooseUnitToMutate(Random &Rand) {
+    InputInfo &II = *Inputs[ChooseUnitIdxToMutate(Rand)];
+    assert(!II.U.empty());
+    return II;
+  }
+
+  InputInfo &ChooseUnitToCrossOverWith(Random &Rand, bool UniformDist) {
+    if (!UniformDist) {
+      return ChooseUnitToMutate(Rand);
+    }
+    InputInfo &II = *Inputs[Rand(Inputs.size())];
+    assert(!II.U.empty());
+    return II;
+  }
+
+  // Returns an index of random unit from the corpus to mutate.
+  size_t ChooseUnitIdxToMutate(Random &Rand) {
+    UpdateCorpusDistribution(Rand);
+    size_t Idx = static_cast<size_t>(CorpusDistribution(Rand));
+    assert(Idx < Inputs.size());
+    return Idx;
+  }
+
+  void PrintStats() {
+    for (size_t i = 0; i < Inputs.size(); i++) {
+      const auto &II = *Inputs[i];
+      Printf("  [% 3zd %s] sz: % 5zd runs: % 5zd succ: % 5zd focus: %d\n", i,
+             Sha1ToString(II.Sha1).c_str(), II.U.size(),
+             II.NumExecutedMutations, II.NumSuccessfullMutations, II.HasFocusFunction);
+    }
+  }
+
+  void PrintFeatureSet() {
+    for (size_t i = 0; i < kFeatureSetSize; i++) {
+      if(size_t Sz = GetFeature(i))
+        Printf("[%zd: id %zd sz%zd] ", i, SmallestElementPerFeature[i], Sz);
+    }
+    Printf("\n\t");
+    for (size_t i = 0; i < Inputs.size(); i++)
+      if (size_t N = Inputs[i]->NumFeatures)
+        Printf(" %zd=>%zd ", i, N);
+    Printf("\n");
+  }
+
+  void DeleteFile(const InputInfo &II) {
+    if (!OutputCorpus.empty() && II.MayDeleteFile)
+      RemoveFile(DirPlusFile(OutputCorpus, Sha1ToString(II.Sha1)));
+  }
+
+  void DeleteInput(size_t Idx) {
+    InputInfo &II = *Inputs[Idx];
+    DeleteFile(II);
+    Unit().swap(II.U);
+    II.Energy = 0.0;
+    II.NeedsEnergyUpdate = false;
+    DistributionNeedsUpdate = true;
+    if (FeatureDebug)
+      Printf("EVICTED %zd\n", Idx);
+  }
+
+  void AddRareFeature(uint32_t Idx) {
+    // Maintain *at least* TopXRarestFeatures many rare features
+    // and all features with a frequency below ConsideredRare.
+    // Remove all other features.
+    while (RareFeatures.size() > Entropic.NumberOfRarestFeatures &&
+           FreqOfMostAbundantRareFeature > Entropic.FeatureFrequencyThreshold) {
+
+      // Find most and second most abbundant feature.
+      uint32_t MostAbundantRareFeatureIndices[2] = {RareFeatures[0],
+                                                    RareFeatures[0]};
+      size_t Delete = 0;
+      for (size_t i = 0; i < RareFeatures.size(); i++) {
+        uint32_t Idx2 = RareFeatures[i];
+        if (GlobalFeatureFreqs[Idx2] >=
+            GlobalFeatureFreqs[MostAbundantRareFeatureIndices[0]]) {
+          MostAbundantRareFeatureIndices[1] = MostAbundantRareFeatureIndices[0];
+          MostAbundantRareFeatureIndices[0] = Idx2;
+          Delete = i;
+        }
+      }
+
+      // Remove most abundant rare feature.
+      RareFeatures[Delete] = RareFeatures.back();
+      RareFeatures.pop_back();
+
+      for (auto II : Inputs) {
+        if (II->DeleteFeatureFreq(MostAbundantRareFeatureIndices[0]))
+          II->NeedsEnergyUpdate = true;
+      }
+
+      // Set 2nd most abundant as the new most abundant feature count.
+      FreqOfMostAbundantRareFeature =
+          GlobalFeatureFreqs[MostAbundantRareFeatureIndices[1]];
+    }
+
+    // Add rare feature, handle collisions, and update energy.
+    RareFeatures.push_back(Idx);
+    GlobalFeatureFreqs[Idx] = 0;
+    for (auto II : Inputs) {
+      II->DeleteFeatureFreq(Idx);
+
+      // Apply add-one smoothing to this locally undiscovered feature.
+      // Zero energy seeds will never be fuzzed and remain zero energy.
+      if (II->Energy > 0.0) {
+        II->SumIncidence += 1;
+        II->Energy += logl(II->SumIncidence) / II->SumIncidence;
+      }
+    }
+
+    DistributionNeedsUpdate = true;
+  }
+
+  bool AddFeature(size_t Idx, uint32_t NewSize, bool Shrink) {
+    assert(NewSize);
+    Idx = Idx % kFeatureSetSize;
+    uint32_t OldSize = GetFeature(Idx);
+    if (OldSize == 0 || (Shrink && OldSize > NewSize)) {
+      if (OldSize > 0) {
+        size_t OldIdx = SmallestElementPerFeature[Idx];
+        InputInfo &II = *Inputs[OldIdx];
+        assert(II.NumFeatures > 0);
+        II.NumFeatures--;
+        if (II.NumFeatures == 0)
+          DeleteInput(OldIdx);
+      } else {
+        NumAddedFeatures++;
+        if (Entropic.Enabled)
+          AddRareFeature((uint32_t)Idx);
+      }
+      NumUpdatedFeatures++;
+      if (FeatureDebug)
+        Printf("ADD FEATURE %zd sz %d\n", Idx, NewSize);
+      SmallestElementPerFeature[Idx] = Inputs.size();
+      InputSizesPerFeature[Idx] = NewSize;
+      return true;
+    }
+    return false;
+  }
+
+  // Increment frequency of feature Idx globally and locally.
+  void UpdateFeatureFrequency(InputInfo *II, size_t Idx) {
+    uint32_t Idx32 = Idx % kFeatureSetSize;
+
+    // Saturated increment.
+    if (GlobalFeatureFreqs[Idx32] == 0xFFFF)
+      return;
+    uint16_t Freq = GlobalFeatureFreqs[Idx32]++;
+
+    // Skip if abundant.
+    if (Freq > FreqOfMostAbundantRareFeature ||
+        std::find(RareFeatures.begin(), RareFeatures.end(), Idx32) ==
+            RareFeatures.end())
+      return;
+
+    // Update global frequencies.
+    if (Freq == FreqOfMostAbundantRareFeature)
+      FreqOfMostAbundantRareFeature++;
+
+    // Update local frequencies.
+    if (II)
+      II->UpdateFeatureFrequency(Idx32);
+  }
+
+  size_t NumFeatures() const { return NumAddedFeatures; }
+  size_t NumFeatureUpdates() const { return NumUpdatedFeatures; }
+
+private:
+
+  static const bool FeatureDebug = false;
+
+  size_t GetFeature(size_t Idx) const { return InputSizesPerFeature[Idx]; }
+
+  void ValidateFeatureSet() {
+    if (FeatureDebug)
+      PrintFeatureSet();
+    for (size_t Idx = 0; Idx < kFeatureSetSize; Idx++)
+      if (GetFeature(Idx))
+        Inputs[SmallestElementPerFeature[Idx]]->Tmp++;
+    for (auto II: Inputs) {
+      if (II->Tmp != II->NumFeatures)
+        Printf("ZZZ %zd %zd\n", II->Tmp, II->NumFeatures);
+      assert(II->Tmp == II->NumFeatures);
+      II->Tmp = 0;
+    }
+  }
+
+  // Updates the probability distribution for the units in the corpus.
+  // Must be called whenever the corpus or unit weights are changed.
+  //
+  // Hypothesis: inputs that maximize information about globally rare features
+  // are interesting.
+  void UpdateCorpusDistribution(Random &Rand) {
+    // Skip update if no seeds or rare features were added/deleted.
+    // Sparse updates for local change of feature frequencies,
+    // i.e., randomly do not skip.
+    if (!DistributionNeedsUpdate &&
+        (!Entropic.Enabled || Rand(kSparseEnergyUpdates)))
+      return;
+
+    DistributionNeedsUpdate = false;
+
+    size_t N = Inputs.size();
+    assert(N);
+    Intervals.resize(N + 1);
+    Weights.resize(N);
+    std::iota(Intervals.begin(), Intervals.end(), 0);
+
+    std::chrono::microseconds AverageUnitExecutionTime(0);
+    for (auto II : Inputs) {
+      AverageUnitExecutionTime += II->TimeOfUnit;
+    }
+    AverageUnitExecutionTime /= N;
+
+    bool VanillaSchedule = true;
+    if (Entropic.Enabled) {
+      for (auto II : Inputs) {
+        if (II->NeedsEnergyUpdate && II->Energy != 0.0) {
+          II->NeedsEnergyUpdate = false;
+          II->UpdateEnergy(RareFeatures.size(), Entropic.ScalePerExecTime,
+                           AverageUnitExecutionTime);
+        }
+      }
+
+      for (size_t i = 0; i < N; i++) {
+
+        if (Inputs[i]->NumFeatures == 0) {
+          // If the seed doesn't represent any features, assign zero energy.
+          Weights[i] = 0.;
+        } else if (Inputs[i]->NumExecutedMutations / kMaxMutationFactor >
+                   NumExecutedMutations / Inputs.size()) {
+          // If the seed was fuzzed a lot more than average, assign zero energy.
+          Weights[i] = 0.;
+        } else {
+          // Otherwise, simply assign the computed energy.
+          Weights[i] = Inputs[i]->Energy;
+        }
+
+        // If energy for all seeds is zero, fall back to vanilla schedule.
+        if (Weights[i] > 0.0)
+          VanillaSchedule = false;
+      }
+    }
+
+    if (VanillaSchedule) {
+      for (size_t i = 0; i < N; i++)
+        Weights[i] = Inputs[i]->NumFeatures
+                         ? (i + 1) * (Inputs[i]->HasFocusFunction ? 1000 : 1)
+                         : 0.;
+    }
+
+    if (FeatureDebug) {
+      for (size_t i = 0; i < N; i++)
+        Printf("%zd ", Inputs[i]->NumFeatures);
+      Printf("SCORE\n");
+      for (size_t i = 0; i < N; i++)
+        Printf("%f ", Weights[i]);
+      Printf("Weights\n");
+    }
+    CorpusDistribution = std::piecewise_constant_distribution<double>(
+        Intervals.begin(), Intervals.end(), Weights.begin());
+  }
+  std::piecewise_constant_distribution<double> CorpusDistribution;
+
+  Vector<double> Intervals;
+  Vector<double> Weights;
+
+  std::unordered_set<std::string> Hashes;
+  Vector<InputInfo*> Inputs;
+
+  size_t NumAddedFeatures = 0;
+  size_t NumUpdatedFeatures = 0;
+  uint32_t InputSizesPerFeature[kFeatureSetSize];
+  uint32_t SmallestElementPerFeature[kFeatureSetSize];
+
+  bool DistributionNeedsUpdate = true;
+  uint16_t FreqOfMostAbundantRareFeature = 0;
+  uint16_t GlobalFeatureFreqs[kFeatureSetSize] = {};
+  Vector<uint32_t> RareFeatures;
+
+  std::string OutputCorpus;
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_CORPUS
diff --git a/custom_mutators/libfuzzer/FuzzerCrossOver.cpp b/custom_mutators/libfuzzer/FuzzerCrossOver.cpp
new file mode 100644
index 00000000..3b3fd94a
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerCrossOver.cpp
@@ -0,0 +1,60 @@
+//===- FuzzerCrossOver.cpp - Cross over two test inputs -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Cross over test inputs.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#include "FuzzerMutate.h"
+#include "FuzzerRandom.h"
+#include <cstring>
+
+namespace fuzzer {
+
+// Cross Data1 and Data2, store the result (up to MaxOutSize bytes) in Out.
+size_t MutationDispatcher::CrossOver(const uint8_t *Data1, size_t Size1,
+                                     const uint8_t *Data2, size_t Size2,
+                                     uint8_t *Out, size_t MaxOutSize) {
+
+  assert(Size1 || Size2);
+  MaxOutSize = Rand(MaxOutSize) + 1;
+  size_t         OutPos = 0;
+  size_t         Pos1 = 0;
+  size_t         Pos2 = 0;
+  size_t *       InPos = &Pos1;
+  size_t         InSize = Size1;
+  const uint8_t *Data = Data1;
+  bool           CurrentlyUsingFirstData = true;
+  while (OutPos < MaxOutSize && (Pos1 < Size1 || Pos2 < Size2)) {
+
+    // Merge a part of Data into Out.
+    size_t OutSizeLeft = MaxOutSize - OutPos;
+    if (*InPos < InSize) {
+
+      size_t InSizeLeft = InSize - *InPos;
+      size_t MaxExtraSize = std::min(OutSizeLeft, InSizeLeft);
+      size_t ExtraSize = Rand(MaxExtraSize) + 1;
+      memcpy(Out + OutPos, Data + *InPos, ExtraSize);
+      OutPos += ExtraSize;
+      (*InPos) += ExtraSize;
+
+    }
+
+    // Use the other input data on the next iteration.
+    InPos = CurrentlyUsingFirstData ? &Pos2 : &Pos1;
+    InSize = CurrentlyUsingFirstData ? Size2 : Size1;
+    Data = CurrentlyUsingFirstData ? Data2 : Data1;
+    CurrentlyUsingFirstData = !CurrentlyUsingFirstData;
+
+  }
+
+  return OutPos;
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
new file mode 100644
index 00000000..797a52a7
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
@@ -0,0 +1,344 @@
+//===- FuzzerDataFlowTrace.cpp - DataFlowTrace                ---*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::DataFlowTrace
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDataFlowTrace.h"
+
+#include "FuzzerCommand.h"
+#include "FuzzerIO.h"
+#include "FuzzerRandom.h"
+#include "FuzzerSHA1.h"
+#include "FuzzerUtil.h"
+
+#include <cstdlib>
+#include <fstream>
+#include <numeric>
+#include <queue>
+#include <sstream>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+namespace fuzzer {
+
+static const char *kFunctionsTxt = "functions.txt";
+
+bool BlockCoverage::AppendCoverage(const std::string &S) {
+
+  std::stringstream SS(S);
+  return AppendCoverage(SS);
+
+}
+
+// Coverage lines have this form:
+// CN X Y Z T
+// where N is the number of the function, T is the total number of instrumented
+// BBs, and X,Y,Z, if present, are the indecies of covered BB.
+// BB #0, which is the entry block, is not explicitly listed.
+bool BlockCoverage::AppendCoverage(std::istream &IN) {
+
+  std::string L;
+  while (std::getline(IN, L, '\n')) {
+
+    if (L.empty()) continue;
+    std::stringstream SS(L.c_str() + 1);
+    size_t            FunctionId = 0;
+    SS >> FunctionId;
+    if (L[0] == 'F') {
+
+      FunctionsWithDFT.insert(FunctionId);
+      continue;
+
+    }
+
+    if (L[0] != 'C') continue;
+    Vector<uint32_t> CoveredBlocks;
+    while (true) {
+
+      uint32_t BB = 0;
+      SS >> BB;
+      if (!SS) break;
+      CoveredBlocks.push_back(BB);
+
+    }
+
+    if (CoveredBlocks.empty()) return false;
+    uint32_t NumBlocks = CoveredBlocks.back();
+    CoveredBlocks.pop_back();
+    for (auto BB : CoveredBlocks)
+      if (BB >= NumBlocks) return false;
+    auto  It = Functions.find(FunctionId);
+    auto &Counters =
+        It == Functions.end()
+            ? Functions.insert({FunctionId, Vector<uint32_t>(NumBlocks)})
+                  .first->second
+            : It->second;
+
+    if (Counters.size() != NumBlocks) return false;  // wrong number of blocks.
+
+    Counters[0]++;
+    for (auto BB : CoveredBlocks)
+      Counters[BB]++;
+
+  }
+
+  return true;
+
+}
+
+// Assign weights to each function.
+// General principles:
+//   * any uncovered function gets weight 0.
+//   * a function with lots of uncovered blocks gets bigger weight.
+//   * a function with a less frequently executed code gets bigger weight.
+Vector<double> BlockCoverage::FunctionWeights(size_t NumFunctions) const {
+
+  Vector<double> Res(NumFunctions);
+  for (auto It : Functions) {
+
+    auto FunctionID = It.first;
+    auto Counters = It.second;
+    assert(FunctionID < NumFunctions);
+    auto &Weight = Res[FunctionID];
+    // Give higher weight if the function has a DFT.
+    Weight = FunctionsWithDFT.count(FunctionID) ? 1000. : 1;
+    // Give higher weight to functions with less frequently seen basic blocks.
+    Weight /= SmallestNonZeroCounter(Counters);
+    // Give higher weight to functions with the most uncovered basic blocks.
+    Weight *= NumberOfUncoveredBlocks(Counters) + 1;
+
+  }
+
+  return Res;
+
+}
+
+void DataFlowTrace::ReadCoverage(const std::string &DirPath) {
+
+  Vector<SizedFile> Files;
+  GetSizedFilesFromDir(DirPath, &Files);
+  for (auto &SF : Files) {
+
+    auto Name = Basename(SF.File);
+    if (Name == kFunctionsTxt) continue;
+    if (!CorporaHashes.count(Name)) continue;
+    std::ifstream IF(SF.File);
+    Coverage.AppendCoverage(IF);
+
+  }
+
+}
+
+static void DFTStringAppendToVector(Vector<uint8_t> *  DFT,
+                                    const std::string &DFTString) {
+
+  assert(DFT->size() == DFTString.size());
+  for (size_t I = 0, Len = DFT->size(); I < Len; I++)
+    (*DFT)[I] = DFTString[I] == '1';
+
+}
+
+// converts a string of '0' and '1' into a Vector<uint8_t>
+static Vector<uint8_t> DFTStringToVector(const std::string &DFTString) {
+
+  Vector<uint8_t> DFT(DFTString.size());
+  DFTStringAppendToVector(&DFT, DFTString);
+  return DFT;
+
+}
+
+static bool ParseError(const char *Err, const std::string &Line) {
+
+  Printf("DataFlowTrace: parse error: %s: Line: %s\n", Err, Line.c_str());
+  return false;
+
+}
+
+// TODO(metzman): replace std::string with std::string_view for
+// better performance. Need to figure our how to use string_view on Windows.
+static bool ParseDFTLine(const std::string &Line, size_t *FunctionNum,
+                         std::string *DFTString) {
+
+  if (!Line.empty() && Line[0] != 'F') return false;  // Ignore coverage.
+  size_t SpacePos = Line.find(' ');
+  if (SpacePos == std::string::npos)
+    return ParseError("no space in the trace line", Line);
+  if (Line.empty() || Line[0] != 'F')
+    return ParseError("the trace line doesn't start with 'F'", Line);
+  *FunctionNum = std::atol(Line.c_str() + 1);
+  const char *Beg = Line.c_str() + SpacePos + 1;
+  const char *End = Line.c_str() + Line.size();
+  assert(Beg < End);
+  size_t Len = End - Beg;
+  for (size_t I = 0; I < Len; I++) {
+
+    if (Beg[I] != '0' && Beg[I] != '1')
+      return ParseError("the trace should contain only 0 or 1", Line);
+
+  }
+
+  *DFTString = Beg;
+  return true;
+
+}
+
+bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
+                         Vector<SizedFile> &CorporaFiles, Random &Rand) {
+
+  if (DirPath.empty()) return false;
+  Printf("INFO: DataFlowTrace: reading from '%s'\n", DirPath.c_str());
+  Vector<SizedFile> Files;
+  GetSizedFilesFromDir(DirPath, &Files);
+  std::string         L;
+  size_t              FocusFuncIdx = SIZE_MAX;
+  Vector<std::string> FunctionNames;
+
+  // Collect the hashes of the corpus files.
+  for (auto &SF : CorporaFiles)
+    CorporaHashes.insert(Hash(FileToVector(SF.File)));
+
+  // Read functions.txt
+  std::ifstream IF(DirPlusFile(DirPath, kFunctionsTxt));
+  size_t        NumFunctions = 0;
+  while (std::getline(IF, L, '\n')) {
+
+    FunctionNames.push_back(L);
+    NumFunctions++;
+    if (*FocusFunction == L) FocusFuncIdx = NumFunctions - 1;
+
+  }
+
+  if (!NumFunctions) return false;
+
+  if (*FocusFunction == "auto") {
+
+    // AUTOFOCUS works like this:
+    // * reads the coverage data from the DFT files.
+    // * assigns weights to functions based on coverage.
+    // * chooses a random function according to the weights.
+    ReadCoverage(DirPath);
+    auto           Weights = Coverage.FunctionWeights(NumFunctions);
+    Vector<double> Intervals(NumFunctions + 1);
+    std::iota(Intervals.begin(), Intervals.end(), 0);
+    auto Distribution = std::piecewise_constant_distribution<double>(
+        Intervals.begin(), Intervals.end(), Weights.begin());
+    FocusFuncIdx = static_cast<size_t>(Distribution(Rand));
+    *FocusFunction = FunctionNames[FocusFuncIdx];
+    assert(FocusFuncIdx < NumFunctions);
+    Printf("INFO: AUTOFOCUS: %zd %s\n", FocusFuncIdx,
+           FunctionNames[FocusFuncIdx].c_str());
+    for (size_t i = 0; i < NumFunctions; i++) {
+
+      if (!Weights[i]) continue;
+      Printf("  [%zd] W %g\tBB-tot %u\tBB-cov %u\tEntryFreq %u:\t%s\n", i,
+             Weights[i], Coverage.GetNumberOfBlocks(i),
+             Coverage.GetNumberOfCoveredBlocks(i), Coverage.GetCounter(i, 0),
+             FunctionNames[i].c_str());
+
+    }
+
+  }
+
+  if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
+    return false;
+
+  // Read traces.
+  size_t NumTraceFiles = 0;
+  size_t NumTracesWithFocusFunction = 0;
+  for (auto &SF : Files) {
+
+    auto Name = Basename(SF.File);
+    if (Name == kFunctionsTxt) continue;
+    if (!CorporaHashes.count(Name)) continue;  // not in the corpus.
+    NumTraceFiles++;
+    // Printf("=== %s\n", Name.c_str());
+    std::ifstream IF(SF.File);
+    while (std::getline(IF, L, '\n')) {
+
+      size_t      FunctionNum = 0;
+      std::string DFTString;
+      if (ParseDFTLine(L, &FunctionNum, &DFTString) &&
+          FunctionNum == FocusFuncIdx) {
+
+        NumTracesWithFocusFunction++;
+
+        if (FunctionNum >= NumFunctions)
+          return ParseError("N is greater than the number of functions", L);
+        Traces[Name] = DFTStringToVector(DFTString);
+        // Print just a few small traces.
+        if (NumTracesWithFocusFunction <= 3 && DFTString.size() <= 16)
+          Printf("%s => |%s|\n", Name.c_str(), std::string(DFTString).c_str());
+        break;  // No need to parse the following lines.
+
+      }
+
+    }
+
+  }
+
+  Printf(
+      "INFO: DataFlowTrace: %zd trace files, %zd functions, "
+      "%zd traces with focus function\n",
+      NumTraceFiles, NumFunctions, NumTracesWithFocusFunction);
+  return NumTraceFiles > 0;
+
+}
+
+int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
+                    const Vector<SizedFile> &CorporaFiles) {
+
+  Printf("INFO: collecting data flow: bin: %s dir: %s files: %zd\n",
+         DFTBinary.c_str(), DirPath.c_str(), CorporaFiles.size());
+  if (CorporaFiles.empty()) {
+
+    Printf("ERROR: can't collect data flow without corpus provided.");
+    return 1;
+
+  }
+
+  static char DFSanEnv[] = "DFSAN_OPTIONS=warn_unimplemented=0";
+  putenv(DFSanEnv);
+  MkDir(DirPath);
+  for (auto &F : CorporaFiles) {
+
+    // For every input F we need to collect the data flow and the coverage.
+    // Data flow collection may fail if we request too many DFSan tags at once.
+    // So, we start from requesting all tags in range [0,Size) and if that fails
+    // we then request tags in [0,Size/2) and [Size/2, Size), and so on.
+    // Function number => DFT.
+    auto OutPath = DirPlusFile(DirPath, Hash(FileToVector(F.File)));
+    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
+    std::unordered_set<std::string>             Cov;
+    Command                                     Cmd;
+    Cmd.addArgument(DFTBinary);
+    Cmd.addArgument(F.File);
+    Cmd.addArgument(OutPath);
+    Printf("CMD: %s\n", Cmd.toString().c_str());
+    ExecuteCommand(Cmd);
+
+  }
+
+  // Write functions.txt if it's currently empty or doesn't exist.
+  auto FunctionsTxtPath = DirPlusFile(DirPath, kFunctionsTxt);
+  if (FileToString(FunctionsTxtPath).empty()) {
+
+    Command Cmd;
+    Cmd.addArgument(DFTBinary);
+    Cmd.setOutputFile(FunctionsTxtPath);
+    ExecuteCommand(Cmd);
+
+  }
+
+  return 0;
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.h b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.h
new file mode 100644
index 00000000..d6e3de30
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.h
@@ -0,0 +1,135 @@
+//===- FuzzerDataFlowTrace.h - Internal header for the Fuzzer ---*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::DataFlowTrace; reads and handles a data-flow trace.
+//
+// A data flow trace is generated by e.g. dataflow/DataFlow.cpp
+// and is stored on disk in a separate directory.
+//
+// The trace dir contains a file 'functions.txt' which lists function names,
+// oner per line, e.g.
+// ==> functions.txt <==
+// Func2
+// LLVMFuzzerTestOneInput
+// Func1
+//
+// All other files in the dir are the traces, see dataflow/DataFlow.cpp.
+// The name of the file is sha1 of the input used to generate the trace.
+//
+// Current status:
+//   the data is parsed and the summary is printed, but the data is not yet
+//   used in any other way.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_DATA_FLOW_TRACE
+#define LLVM_FUZZER_DATA_FLOW_TRACE
+
+#include "FuzzerDefs.h"
+#include "FuzzerIO.h"
+
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+#include <string>
+
+namespace fuzzer {
+
+int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
+                    const Vector<SizedFile> &CorporaFiles);
+
+class BlockCoverage {
+ public:
+  bool AppendCoverage(std::istream &IN);
+  bool AppendCoverage(const std::string &S);
+
+  size_t NumCoveredFunctions() const { return Functions.size(); }
+
+  uint32_t GetCounter(size_t FunctionId, size_t BasicBlockId) {
+    auto It = Functions.find(FunctionId);
+    if (It == Functions.end()) return 0;
+    const auto &Counters = It->second;
+    if (BasicBlockId < Counters.size())
+      return Counters[BasicBlockId];
+    return 0;
+  }
+
+  uint32_t GetNumberOfBlocks(size_t FunctionId) {
+    auto It = Functions.find(FunctionId);
+    if (It == Functions.end()) return 0;
+    const auto &Counters = It->second;
+    return Counters.size();
+  }
+
+  uint32_t GetNumberOfCoveredBlocks(size_t FunctionId) {
+    auto It = Functions.find(FunctionId);
+    if (It == Functions.end()) return 0;
+    const auto &Counters = It->second;
+    uint32_t Result = 0;
+    for (auto Cnt: Counters)
+      if (Cnt)
+        Result++;
+    return Result;
+  }
+
+  Vector<double> FunctionWeights(size_t NumFunctions) const;
+  void clear() { Functions.clear(); }
+
+ private:
+
+  typedef Vector<uint32_t> CoverageVector;
+
+  uint32_t NumberOfCoveredBlocks(const CoverageVector &Counters) const {
+    uint32_t Res = 0;
+    for (auto Cnt : Counters)
+      if (Cnt)
+        Res++;
+    return Res;
+  }
+
+  uint32_t NumberOfUncoveredBlocks(const CoverageVector &Counters) const {
+    return Counters.size() - NumberOfCoveredBlocks(Counters);
+  }
+
+  uint32_t SmallestNonZeroCounter(const CoverageVector &Counters) const {
+    assert(!Counters.empty());
+    uint32_t Res = Counters[0];
+    for (auto Cnt : Counters)
+      if (Cnt)
+        Res = Min(Res, Cnt);
+    assert(Res);
+    return Res;
+  }
+
+  // Function ID => vector of counters.
+  // Each counter represents how many input files trigger the given basic block.
+  std::unordered_map<size_t, CoverageVector> Functions;
+  // Functions that have DFT entry.
+  std::unordered_set<size_t> FunctionsWithDFT;
+};
+
+class DataFlowTrace {
+ public:
+  void ReadCoverage(const std::string &DirPath);
+  bool Init(const std::string &DirPath, std::string *FocusFunction,
+            Vector<SizedFile> &CorporaFiles, Random &Rand);
+  void Clear() { Traces.clear(); }
+  const Vector<uint8_t> *Get(const std::string &InputSha1) const {
+    auto It = Traces.find(InputSha1);
+    if (It != Traces.end())
+      return &It->second;
+    return nullptr;
+  }
+
+ private:
+  // Input's sha1 => DFT for the FocusFunction.
+  std::unordered_map<std::string, Vector<uint8_t> > Traces;
+  BlockCoverage Coverage;
+  std::unordered_set<std::string> CorporaHashes;
+};
+}  // namespace fuzzer
+
+#endif // LLVM_FUZZER_DATA_FLOW_TRACE
diff --git a/custom_mutators/libfuzzer/FuzzerDefs.h b/custom_mutators/libfuzzer/FuzzerDefs.h
new file mode 100644
index 00000000..1a2752af
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerDefs.h
@@ -0,0 +1,75 @@
+//===- FuzzerDefs.h - Internal header for the Fuzzer ------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Basic definitions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_DEFS_H
+#define LLVM_FUZZER_DEFS_H
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+
+namespace fuzzer {
+
+template <class T> T Min(T a, T b) { return a < b ? a : b; }
+template <class T> T Max(T a, T b) { return a > b ? a : b; }
+
+class Random;
+class Dictionary;
+class DictionaryEntry;
+class MutationDispatcher;
+struct FuzzingOptions;
+class InputCorpus;
+struct InputInfo;
+struct ExternalFunctions;
+
+// Global interface to functions that may or may not be available.
+extern ExternalFunctions *EF;
+
+// We are using a custom allocator to give a different symbol name to STL
+// containers in order to avoid ODR violations.
+template<typename T>
+  class fuzzer_allocator: public std::allocator<T> {
+    public:
+      fuzzer_allocator() = default;
+
+      template<class U>
+      fuzzer_allocator(const fuzzer_allocator<U>&) {}
+
+      template<class Other>
+      struct rebind { typedef fuzzer_allocator<Other> other;  };
+  };
+
+template<typename T>
+using Vector = std::vector<T, fuzzer_allocator<T>>;
+
+template<typename T>
+using Set = std::set<T, std::less<T>, fuzzer_allocator<T>>;
+
+typedef Vector<uint8_t> Unit;
+typedef Vector<Unit> UnitVector;
+typedef int (*UserCallback)(const uint8_t *Data, size_t Size);
+
+int FuzzerDriver(int *argc, char ***argv, UserCallback Callback);
+
+uint8_t *ExtraCountersBegin();
+uint8_t *ExtraCountersEnd();
+void ClearExtraCounters();
+
+extern bool RunningUserCallback;
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_DEFS_H
diff --git a/custom_mutators/libfuzzer/FuzzerDictionary.h b/custom_mutators/libfuzzer/FuzzerDictionary.h
new file mode 100644
index 00000000..301c5d9a
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerDictionary.h
@@ -0,0 +1,118 @@
+//===- FuzzerDictionary.h - Internal header for the Fuzzer ------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::Dictionary
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_DICTIONARY_H
+#define LLVM_FUZZER_DICTIONARY_H
+
+#include "FuzzerDefs.h"
+#include "FuzzerIO.h"
+#include "FuzzerUtil.h"
+#include <algorithm>
+#include <limits>
+
+namespace fuzzer {
+// A simple POD sized array of bytes.
+template <size_t kMaxSizeT> class FixedWord {
+public:
+  static const size_t kMaxSize = kMaxSizeT;
+  FixedWord() {}
+  FixedWord(const uint8_t *B, uint8_t S) { Set(B, S); }
+
+  void Set(const uint8_t *B, uint8_t S) {
+    assert(S <= kMaxSize);
+    memcpy(Data, B, S);
+    Size = S;
+  }
+
+  bool operator==(const FixedWord<kMaxSize> &w) const {
+    return Size == w.Size && 0 == memcmp(Data, w.Data, Size);
+  }
+
+  static size_t GetMaxSize() { return kMaxSize; }
+  const uint8_t *data() const { return Data; }
+  uint8_t size() const { return Size; }
+
+private:
+  uint8_t Size = 0;
+  uint8_t Data[kMaxSize];
+};
+
+typedef FixedWord<64> Word;
+
+class DictionaryEntry {
+ public:
+  DictionaryEntry() {}
+  DictionaryEntry(Word W) : W(W) {}
+  DictionaryEntry(Word W, size_t PositionHint) : W(W), PositionHint(PositionHint) {}
+  const Word &GetW() const { return W; }
+
+  bool HasPositionHint() const { return PositionHint != std::numeric_limits<size_t>::max(); }
+  size_t GetPositionHint() const {
+    assert(HasPositionHint());
+    return PositionHint;
+  }
+  void IncUseCount() { UseCount++; }
+  void IncSuccessCount() { SuccessCount++; }
+  size_t GetUseCount() const { return UseCount; }
+  size_t GetSuccessCount() const {return SuccessCount; }
+
+  void Print(const char *PrintAfter = "\n") {
+    PrintASCII(W.data(), W.size());
+    if (HasPositionHint())
+      Printf("@%zd", GetPositionHint());
+    Printf("%s", PrintAfter);
+  }
+
+private:
+  Word W;
+  size_t PositionHint = std::numeric_limits<size_t>::max();
+  size_t UseCount = 0;
+  size_t SuccessCount = 0;
+};
+
+class Dictionary {
+ public:
+  static const size_t kMaxDictSize = 1 << 14;
+
+  bool ContainsWord(const Word &W) const {
+    return std::any_of(begin(), end(), [&](const DictionaryEntry &DE) {
+      return DE.GetW() == W;
+    });
+  }
+  const DictionaryEntry *begin() const { return &DE[0]; }
+  const DictionaryEntry *end() const { return begin() + Size; }
+  DictionaryEntry & operator[] (size_t Idx) {
+    assert(Idx < Size);
+    return DE[Idx];
+  }
+  void push_back(DictionaryEntry DE) {
+    if (Size < kMaxDictSize)
+      this->DE[Size++] = DE;
+  }
+  void clear() { Size = 0; }
+  bool empty() const { return Size == 0; }
+  size_t size() const { return Size; }
+
+private:
+  DictionaryEntry DE[kMaxDictSize];
+  size_t Size = 0;
+};
+
+// Parses one dictionary entry.
+// If successful, write the enty to Unit and returns true,
+// otherwise returns false.
+bool ParseOneDictionaryEntry(const std::string &Str, Unit *U);
+// Parses the dictionary file, fills Units, returns true iff all lines
+// were parsed successfully.
+bool ParseDictionaryFile(const std::string &Text, Vector<Unit> *Units);
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_DICTIONARY_H
diff --git a/custom_mutators/libfuzzer/FuzzerDriver.cpp b/custom_mutators/libfuzzer/FuzzerDriver.cpp
new file mode 100644
index 00000000..9a0a32b0
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerDriver.cpp
@@ -0,0 +1,1122 @@
+//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// FuzzerDriver and flag parsing.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerCommand.h"
+#include "FuzzerCorpus.h"
+#include "FuzzerFork.h"
+#include "FuzzerIO.h"
+#include "FuzzerInterface.h"
+#include "FuzzerInternal.h"
+#include "FuzzerMerge.h"
+#include "FuzzerMutate.h"
+#include "FuzzerPlatform.h"
+#include "FuzzerRandom.h"
+#include "FuzzerTracePC.h"
+#include <algorithm>
+#include <atomic>
+#include <chrono>
+#include <cstdlib>
+#include <cstring>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <fstream>
+
+// This function should be present in the libFuzzer so that the client
+// binary can test for its existence.
+#if LIBFUZZER_MSVC
+extern "C" void __libfuzzer_is_present() {
+
+}
+
+  #if defined(_M_IX86) || defined(__i386__)
+    #pragma comment(linker, "/include:___libfuzzer_is_present")
+  #else
+    #pragma comment(linker, "/include:__libfuzzer_is_present")
+  #endif
+#else
+extern "C" __attribute__((used)) void __libfuzzer_is_present() {
+
+}
+
+#endif  // LIBFUZZER_MSVC
+
+namespace fuzzer {
+
+// Program arguments.
+struct FlagDescription {
+
+  const char *  Name;
+  const char *  Description;
+  int           Default;
+  int *         IntFlag;
+  const char ** StrFlag;
+  unsigned int *UIntFlag;
+
+};
+
+struct {
+\
+#define FUZZER_DEPRECATED_FLAG(Name)
+#define FUZZER_FLAG_INT(Name, Default, Description) int Name;
+#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) unsigned int Name;
+#define FUZZER_FLAG_STRING(Name, Description) const char *Name;
+#include "FuzzerFlags.def"
+#undef FUZZER_DEPRECATED_FLAG
+#undef FUZZER_FLAG_INT
+#undef FUZZER_FLAG_UNSIGNED
+#undef FUZZER_FLAG_STRING
+
+} Flags;
+
+static const FlagDescription FlagDescriptions[]{
+\
+#define FUZZER_DEPRECATED_FLAG(Name) \
+  {#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr},
+#define FUZZER_FLAG_INT(Name, Default, Description) \
+  {#Name, Description, Default, &Flags.Name, nullptr, nullptr},
+#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) \
+  {#Name,   Description, static_cast<int>(Default),      \
+   nullptr, nullptr,     &Flags.Name},
+#define FUZZER_FLAG_STRING(Name, Description) \
+  {#Name, Description, 0, nullptr, &Flags.Name, nullptr},
+#include "FuzzerFlags.def"
+#undef FUZZER_DEPRECATED_FLAG
+#undef FUZZER_FLAG_INT
+#undef FUZZER_FLAG_UNSIGNED
+#undef FUZZER_FLAG_STRING
+
+};
+
+static const size_t kNumFlags =
+    sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
+
+static Vector<std::string> *Inputs;
+static std::string *        ProgName;
+
+static void PrintHelp() {
+
+  Printf("Usage:\n");
+  auto Prog = ProgName->c_str();
+  Printf("\nTo run fuzzing pass 0 or more directories.\n");
+  Printf("%s [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n", Prog);
+
+  Printf("\nTo run individual tests without fuzzing pass 1 or more files:\n");
+  Printf("%s [-flag1=val1 [-flag2=val2 ...] ] file1 [file2 ...]\n", Prog);
+
+  Printf("\nFlags: (strictly in form -flag=value)\n");
+  size_t MaxFlagLen = 0;
+  for (size_t F = 0; F < kNumFlags; F++)
+    MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
+
+  for (size_t F = 0; F < kNumFlags; F++) {
+
+    const auto &D = FlagDescriptions[F];
+    if (strstr(D.Description, "internal flag") == D.Description) continue;
+    Printf(" %s", D.Name);
+    for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
+      Printf(" ");
+    Printf("\t");
+    Printf("%d\t%s\n", D.Default, D.Description);
+
+  }
+
+  Printf(
+      "\nFlags starting with '--' will be ignored and "
+      "will be passed verbatim to subprocesses.\n");
+
+}
+
+static const char *FlagValue(const char *Param, const char *Name) {
+
+  size_t Len = strlen(Name);
+  if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
+      Param[Len + 1] == '=')
+    return &Param[Len + 2];
+  return nullptr;
+
+}
+
+// Avoid calling stol as it triggers a bug in clang/glibc build.
+static long MyStol(const char *Str) {
+
+  long Res = 0;
+  long Sign = 1;
+  if (*Str == '-') {
+
+    Str++;
+    Sign = -1;
+
+  }
+
+  for (size_t i = 0; Str[i]; i++) {
+
+    char Ch = Str[i];
+    if (Ch < '0' || Ch > '9') return Res;
+    Res = Res * 10 + (Ch - '0');
+
+  }
+
+  return Res * Sign;
+
+}
+
+static bool ParseOneFlag(const char *Param) {
+
+  if (Param[0] != '-') return false;
+  if (Param[1] == '-') {
+
+    static bool PrintedWarning = false;
+    if (!PrintedWarning) {
+
+      PrintedWarning = true;
+      Printf("INFO: libFuzzer ignores flags that start with '--'\n");
+
+    }
+
+    for (size_t F = 0; F < kNumFlags; F++)
+      if (FlagValue(Param + 1, FlagDescriptions[F].Name))
+        Printf("WARNING: did you mean '%s' (single dash)?\n", Param + 1);
+    return true;
+
+  }
+
+  for (size_t F = 0; F < kNumFlags; F++) {
+
+    const char *Name = FlagDescriptions[F].Name;
+    const char *Str = FlagValue(Param, Name);
+    if (Str) {
+
+      if (FlagDescriptions[F].IntFlag) {
+
+        int Val = MyStol(Str);
+        *FlagDescriptions[F].IntFlag = Val;
+        if (Flags.verbosity >= 2) Printf("Flag: %s %d\n", Name, Val);
+        return true;
+
+      } else if (FlagDescriptions[F].UIntFlag) {
+
+        unsigned int Val = std::stoul(Str);
+        *FlagDescriptions[F].UIntFlag = Val;
+        if (Flags.verbosity >= 2) Printf("Flag: %s %u\n", Name, Val);
+        return true;
+
+      } else if (FlagDescriptions[F].StrFlag) {
+
+        *FlagDescriptions[F].StrFlag = Str;
+        if (Flags.verbosity >= 2) Printf("Flag: %s %s\n", Name, Str);
+        return true;
+
+      } else {  // Deprecated flag.
+
+        Printf("Flag: %s: deprecated, don't use\n", Name);
+        return true;
+
+      }
+
+    }
+
+  }
+
+  Printf(
+      "\n\nWARNING: unrecognized flag '%s'; "
+      "use -help=1 to list all flags\n\n",
+      Param);
+  return true;
+
+}
+
+// We don't use any library to minimize dependencies.
+static void ParseFlags(const Vector<std::string> &Args,
+                       const ExternalFunctions *  EF) {
+
+  for (size_t F = 0; F < kNumFlags; F++) {
+
+    if (FlagDescriptions[F].IntFlag)
+      *FlagDescriptions[F].IntFlag = FlagDescriptions[F].Default;
+    if (FlagDescriptions[F].UIntFlag)
+      *FlagDescriptions[F].UIntFlag =
+          static_cast<unsigned int>(FlagDescriptions[F].Default);
+    if (FlagDescriptions[F].StrFlag) *FlagDescriptions[F].StrFlag = nullptr;
+
+  }
+
+  // Disable len_control by default, if LLVMFuzzerCustomMutator is used.
+  if (EF->LLVMFuzzerCustomMutator) {
+
+    Flags.len_control = 0;
+    Printf(
+        "INFO: found LLVMFuzzerCustomMutator (%p). "
+        "Disabling -len_control by default.\n",
+        EF->LLVMFuzzerCustomMutator);
+
+  }
+
+  Inputs = new Vector<std::string>;
+  for (size_t A = 1; A < Args.size(); A++) {
+
+    if (ParseOneFlag(Args[A].c_str())) {
+
+      if (Flags.ignore_remaining_args) break;
+      continue;
+
+    }
+
+    Inputs->push_back(Args[A]);
+
+  }
+
+}
+
+static std::mutex Mu;
+
+static void PulseThread() {
+
+  while (true) {
+
+    SleepSeconds(600);
+    std::lock_guard<std::mutex> Lock(Mu);
+    Printf("pulse...\n");
+
+  }
+
+}
+
+static void WorkerThread(const Command &BaseCmd, std::atomic<unsigned> *Counter,
+                         unsigned NumJobs, std::atomic<bool> *HasErrors) {
+
+  while (true) {
+
+    unsigned C = (*Counter)++;
+    if (C >= NumJobs) break;
+    std::string Log = "fuzz-" + std::to_string(C) + ".log";
+    Command     Cmd(BaseCmd);
+    Cmd.setOutputFile(Log);
+    Cmd.combineOutAndErr();
+    if (Flags.verbosity) {
+
+      std::string CommandLine = Cmd.toString();
+      Printf("%s\n", CommandLine.c_str());
+
+    }
+
+    int ExitCode = ExecuteCommand(Cmd);
+    if (ExitCode != 0) *HasErrors = true;
+    std::lock_guard<std::mutex> Lock(Mu);
+    Printf("================== Job %u exited with exit code %d ============\n",
+           C, ExitCode);
+    fuzzer::CopyFileToErr(Log);
+
+  }
+
+}
+
+static void ValidateDirectoryExists(const std::string &Path,
+                                    bool               CreateDirectory) {
+
+  if (Path.empty()) {
+
+    Printf("ERROR: Provided directory path is an empty string\n");
+    exit(1);
+
+  }
+
+  if (IsDirectory(Path)) return;
+
+  if (CreateDirectory) {
+
+    if (!MkDirRecursive(Path)) {
+
+      Printf("ERROR: Failed to create directory \"%s\"\n", Path.c_str());
+      exit(1);
+
+    }
+
+    return;
+
+  }
+
+  Printf("ERROR: The required directory \"%s\" does not exist\n", Path.c_str());
+  exit(1);
+
+}
+
+std::string CloneArgsWithoutX(const Vector<std::string> &Args, const char *X1,
+                              const char *X2) {
+
+  std::string Cmd;
+  for (auto &S : Args) {
+
+    if (FlagValue(S.c_str(), X1) || FlagValue(S.c_str(), X2)) continue;
+    Cmd += S + " ";
+
+  }
+
+  return Cmd;
+
+}
+
+static int RunInMultipleProcesses(const Vector<std::string> &Args,
+                                  unsigned NumWorkers, unsigned NumJobs) {
+
+  std::atomic<unsigned> Counter(0);
+  std::atomic<bool>     HasErrors(false);
+  Command               Cmd(Args);
+  Cmd.removeFlag("jobs");
+  Cmd.removeFlag("workers");
+  Vector<std::thread> V;
+  std::thread         Pulse(PulseThread);
+  Pulse.detach();
+  for (unsigned i = 0; i < NumWorkers; i++)
+    V.push_back(std::thread(WorkerThread, std::ref(Cmd), &Counter, NumJobs,
+                            &HasErrors));
+  for (auto &T : V)
+    T.join();
+  return HasErrors ? 1 : 0;
+
+}
+
+static void RssThread(Fuzzer *F, size_t RssLimitMb) {
+
+  while (true) {
+
+    SleepSeconds(1);
+    size_t Peak = GetPeakRSSMb();
+    if (Peak > RssLimitMb) F->RssLimitCallback();
+
+  }
+
+}
+
+static void StartRssThread(Fuzzer *F, size_t RssLimitMb) {
+
+  if (!RssLimitMb) return;
+  std::thread T(RssThread, F, RssLimitMb);
+  T.detach();
+
+}
+
+int RunOneTest(Fuzzer *F, const char *InputFilePath, size_t MaxLen) {
+
+  Unit U = FileToVector(InputFilePath);
+  if (MaxLen && MaxLen < U.size()) U.resize(MaxLen);
+  F->ExecuteCallback(U.data(), U.size());
+  F->TryDetectingAMemoryLeak(U.data(), U.size(), true);
+  return 0;
+
+}
+
+static bool AllInputsAreFiles() {
+
+  if (Inputs->empty()) return false;
+  for (auto &Path : *Inputs)
+    if (!IsFile(Path)) return false;
+  return true;
+
+}
+
+static std::string GetDedupTokenFromCmdOutput(const std::string &S) {
+
+  auto Beg = S.find("DEDUP_TOKEN:");
+  if (Beg == std::string::npos) return "";
+  auto End = S.find('\n', Beg);
+  if (End == std::string::npos) return "";
+  return S.substr(Beg, End - Beg);
+
+}
+
+int CleanseCrashInput(const Vector<std::string> &Args,
+                      const FuzzingOptions &     Options) {
+
+  if (Inputs->size() != 1 || !Flags.exact_artifact_path) {
+
+    Printf(
+        "ERROR: -cleanse_crash should be given one input file and"
+        " -exact_artifact_path\n");
+    exit(1);
+
+  }
+
+  std::string InputFilePath = Inputs->at(0);
+  std::string OutputFilePath = Flags.exact_artifact_path;
+  Command     Cmd(Args);
+  Cmd.removeFlag("cleanse_crash");
+
+  assert(Cmd.hasArgument(InputFilePath));
+  Cmd.removeArgument(InputFilePath);
+
+  auto TmpFilePath = TempPath("CleanseCrashInput", ".repro");
+  Cmd.addArgument(TmpFilePath);
+  Cmd.setOutputFile(getDevNull());
+  Cmd.combineOutAndErr();
+
+  std::string CurrentFilePath = InputFilePath;
+  auto        U = FileToVector(CurrentFilePath);
+  size_t      Size = U.size();
+
+  const Vector<uint8_t> ReplacementBytes = {' ', 0xff};
+  for (int NumAttempts = 0; NumAttempts < 5; NumAttempts++) {
+
+    bool Changed = false;
+    for (size_t Idx = 0; Idx < Size; Idx++) {
+
+      Printf("CLEANSE[%d]: Trying to replace byte %zd of %zd\n", NumAttempts,
+             Idx, Size);
+      uint8_t OriginalByte = U[Idx];
+      if (ReplacementBytes.end() != std::find(ReplacementBytes.begin(),
+                                              ReplacementBytes.end(),
+                                              OriginalByte))
+        continue;
+      for (auto NewByte : ReplacementBytes) {
+
+        U[Idx] = NewByte;
+        WriteToFile(U, TmpFilePath);
+        auto ExitCode = ExecuteCommand(Cmd);
+        RemoveFile(TmpFilePath);
+        if (!ExitCode) {
+
+          U[Idx] = OriginalByte;
+
+        } else {
+
+          Changed = true;
+          Printf("CLEANSE: Replaced byte %zd with 0x%x\n", Idx, NewByte);
+          WriteToFile(U, OutputFilePath);
+          break;
+
+        }
+
+      }
+
+    }
+
+    if (!Changed) break;
+
+  }
+
+  return 0;
+
+}
+
+int MinimizeCrashInput(const Vector<std::string> &Args,
+                       const FuzzingOptions &     Options) {
+
+  if (Inputs->size() != 1) {
+
+    Printf("ERROR: -minimize_crash should be given one input file\n");
+    exit(1);
+
+  }
+
+  std::string InputFilePath = Inputs->at(0);
+  Command     BaseCmd(Args);
+  BaseCmd.removeFlag("minimize_crash");
+  BaseCmd.removeFlag("exact_artifact_path");
+  assert(BaseCmd.hasArgument(InputFilePath));
+  BaseCmd.removeArgument(InputFilePath);
+  if (Flags.runs <= 0 && Flags.max_total_time == 0) {
+
+    Printf(
+        "INFO: you need to specify -runs=N or "
+        "-max_total_time=N with -minimize_crash=1\n"
+        "INFO: defaulting to -max_total_time=600\n");
+    BaseCmd.addFlag("max_total_time", "600");
+
+  }
+
+  BaseCmd.combineOutAndErr();
+
+  std::string CurrentFilePath = InputFilePath;
+  while (true) {
+
+    Unit U = FileToVector(CurrentFilePath);
+    Printf("CRASH_MIN: minimizing crash input: '%s' (%zd bytes)\n",
+           CurrentFilePath.c_str(), U.size());
+
+    Command Cmd(BaseCmd);
+    Cmd.addArgument(CurrentFilePath);
+
+    Printf("CRASH_MIN: executing: %s\n", Cmd.toString().c_str());
+    std::string CmdOutput;
+    bool        Success = ExecuteCommand(Cmd, &CmdOutput);
+    if (Success) {
+
+      Printf("ERROR: the input %s did not crash\n", CurrentFilePath.c_str());
+      exit(1);
+
+    }
+
+    Printf(
+        "CRASH_MIN: '%s' (%zd bytes) caused a crash. Will try to minimize "
+        "it further\n",
+        CurrentFilePath.c_str(), U.size());
+    auto DedupToken1 = GetDedupTokenFromCmdOutput(CmdOutput);
+    if (!DedupToken1.empty())
+      Printf("CRASH_MIN: DedupToken1: %s\n", DedupToken1.c_str());
+
+    std::string ArtifactPath =
+        Flags.exact_artifact_path
+            ? Flags.exact_artifact_path
+            : Options.ArtifactPrefix + "minimized-from-" + Hash(U);
+    Cmd.addFlag("minimize_crash_internal_step", "1");
+    Cmd.addFlag("exact_artifact_path", ArtifactPath);
+    Printf("CRASH_MIN: executing: %s\n", Cmd.toString().c_str());
+    CmdOutput.clear();
+    Success = ExecuteCommand(Cmd, &CmdOutput);
+    Printf("%s", CmdOutput.c_str());
+    if (Success) {
+
+      if (Flags.exact_artifact_path) {
+
+        CurrentFilePath = Flags.exact_artifact_path;
+        WriteToFile(U, CurrentFilePath);
+
+      }
+
+      Printf("CRASH_MIN: failed to minimize beyond %s (%d bytes), exiting\n",
+             CurrentFilePath.c_str(), U.size());
+      break;
+
+    }
+
+    auto DedupToken2 = GetDedupTokenFromCmdOutput(CmdOutput);
+    if (!DedupToken2.empty())
+      Printf("CRASH_MIN: DedupToken2: %s\n", DedupToken2.c_str());
+
+    if (DedupToken1 != DedupToken2) {
+
+      if (Flags.exact_artifact_path) {
+
+        CurrentFilePath = Flags.exact_artifact_path;
+        WriteToFile(U, CurrentFilePath);
+
+      }
+
+      Printf(
+          "CRASH_MIN: mismatch in dedup tokens"
+          " (looks like a different bug). Won't minimize further\n");
+      break;
+
+    }
+
+    CurrentFilePath = ArtifactPath;
+    Printf("*********************************\n");
+
+  }
+
+  return 0;
+
+}
+
+int MinimizeCrashInputInternalStep(Fuzzer *F, InputCorpus *Corpus) {
+
+  assert(Inputs->size() == 1);
+  std::string InputFilePath = Inputs->at(0);
+  Unit        U = FileToVector(InputFilePath);
+  Printf("INFO: Starting MinimizeCrashInputInternalStep: %zd\n", U.size());
+  if (U.size() < 2) {
+
+    Printf("INFO: The input is small enough, exiting\n");
+    exit(0);
+
+  }
+
+  F->SetMaxInputLen(U.size());
+  F->SetMaxMutationLen(U.size() - 1);
+  F->MinimizeCrashLoop(U);
+  Printf("INFO: Done MinimizeCrashInputInternalStep, no crashes found\n");
+  exit(0);
+  return 0;
+
+}
+
+void Merge(Fuzzer *F, FuzzingOptions &Options, const Vector<std::string> &Args,
+           const Vector<std::string> &Corpora, const char *CFPathOrNull) {
+
+  if (Corpora.size() < 2) {
+
+    Printf("INFO: Merge requires two or more corpus dirs\n");
+    exit(0);
+
+  }
+
+  Vector<SizedFile> OldCorpus, NewCorpus;
+  GetSizedFilesFromDir(Corpora[0], &OldCorpus);
+  for (size_t i = 1; i < Corpora.size(); i++)
+    GetSizedFilesFromDir(Corpora[i], &NewCorpus);
+  std::sort(OldCorpus.begin(), OldCorpus.end());
+  std::sort(NewCorpus.begin(), NewCorpus.end());
+
+  std::string CFPath = CFPathOrNull ? CFPathOrNull : TempPath("Merge", ".txt");
+  Vector<std::string> NewFiles;
+  Set<uint32_t>       NewFeatures, NewCov;
+  CrashResistantMerge(Args, OldCorpus, NewCorpus, &NewFiles, {}, &NewFeatures,
+                      {}, &NewCov, CFPath, true);
+  for (auto &Path : NewFiles)
+    F->WriteToOutputCorpus(FileToVector(Path, Options.MaxLen));
+  // We are done, delete the control file if it was a temporary one.
+  if (!Flags.merge_control_file) RemoveFile(CFPath);
+
+  exit(0);
+
+}
+
+int AnalyzeDictionary(Fuzzer *F, const Vector<Unit> &Dict, UnitVector &Corpus) {
+
+  Printf("Started dictionary minimization (up to %d tests)\n",
+         Dict.size() * Corpus.size() * 2);
+
+  // Scores and usage count for each dictionary unit.
+  Vector<int> Scores(Dict.size());
+  Vector<int> Usages(Dict.size());
+
+  Vector<size_t> InitialFeatures;
+  Vector<size_t> ModifiedFeatures;
+  for (auto &C : Corpus) {
+
+    // Get coverage for the testcase without modifications.
+    F->ExecuteCallback(C.data(), C.size());
+    InitialFeatures.clear();
+    TPC.CollectFeatures(
+        [&](size_t Feature) { InitialFeatures.push_back(Feature); });
+
+    for (size_t i = 0; i < Dict.size(); ++i) {
+
+      Vector<uint8_t> Data = C;
+      auto            StartPos =
+          std::search(Data.begin(), Data.end(), Dict[i].begin(), Dict[i].end());
+      // Skip dictionary unit, if the testcase does not contain it.
+      if (StartPos == Data.end()) continue;
+
+      ++Usages[i];
+      while (StartPos != Data.end()) {
+
+        // Replace all occurrences of dictionary unit in the testcase.
+        auto EndPos = StartPos + Dict[i].size();
+        for (auto It = StartPos; It != EndPos; ++It)
+          *It ^= 0xFF;
+
+        StartPos =
+            std::search(EndPos, Data.end(), Dict[i].begin(), Dict[i].end());
+
+      }
+
+      // Get coverage for testcase with masked occurrences of dictionary unit.
+      F->ExecuteCallback(Data.data(), Data.size());
+      ModifiedFeatures.clear();
+      TPC.CollectFeatures(
+          [&](size_t Feature) { ModifiedFeatures.push_back(Feature); });
+
+      if (InitialFeatures == ModifiedFeatures)
+        --Scores[i];
+      else
+        Scores[i] += 2;
+
+    }
+
+  }
+
+  Printf("###### Useless dictionary elements. ######\n");
+  for (size_t i = 0; i < Dict.size(); ++i) {
+
+    // Dictionary units with positive score are treated as useful ones.
+    if (Scores[i] > 0) continue;
+
+    Printf("\"");
+    PrintASCII(Dict[i].data(), Dict[i].size(), "\"");
+    Printf(" # Score: %d, Used: %d\n", Scores[i], Usages[i]);
+
+  }
+
+  Printf("###### End of useless dictionary elements. ######\n");
+  return 0;
+
+}
+
+Vector<std::string> ParseSeedInuts(const char *seed_inputs) {
+
+  // Parse -seed_inputs=file1,file2,... or -seed_inputs=@seed_inputs_file
+  Vector<std::string> Files;
+  if (!seed_inputs) return Files;
+  std::string SeedInputs;
+  if (Flags.seed_inputs[0] == '@')
+    SeedInputs = FileToString(Flags.seed_inputs + 1);  // File contains list.
+  else
+    SeedInputs = Flags.seed_inputs;  // seed_inputs contains the list.
+  if (SeedInputs.empty()) {
+
+    Printf("seed_inputs is empty or @file does not exist.\n");
+    exit(1);
+
+  }
+
+  // Parse SeedInputs.
+  size_t comma_pos = 0;
+  while ((comma_pos = SeedInputs.find_last_of(',')) != std::string::npos) {
+
+    Files.push_back(SeedInputs.substr(comma_pos + 1));
+    SeedInputs = SeedInputs.substr(0, comma_pos);
+
+  }
+
+  Files.push_back(SeedInputs);
+  return Files;
+
+}
+
+static Vector<SizedFile> ReadCorpora(
+    const Vector<std::string> &CorpusDirs,
+    const Vector<std::string> &ExtraSeedFiles) {
+
+  Vector<SizedFile> SizedFiles;
+  size_t            LastNumFiles = 0;
+  for (auto &Dir : CorpusDirs) {
+
+    GetSizedFilesFromDir(Dir, &SizedFiles);
+    Printf("INFO: % 8zd files found in %s\n", SizedFiles.size() - LastNumFiles,
+           Dir.c_str());
+    LastNumFiles = SizedFiles.size();
+
+  }
+
+  for (auto &File : ExtraSeedFiles)
+    if (auto Size = FileSize(File)) SizedFiles.push_back({File, Size});
+  return SizedFiles;
+
+}
+
+int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
+
+  using namespace fuzzer;
+  assert(argc && argv && "Argument pointers cannot be nullptr");
+  std::string Argv0((*argv)[0]);
+  EF = new ExternalFunctions();
+  if (EF->LLVMFuzzerInitialize) EF->LLVMFuzzerInitialize(argc, argv);
+  if (EF->__msan_scoped_disable_interceptor_checks)
+    EF->__msan_scoped_disable_interceptor_checks();
+  const Vector<std::string> Args(*argv, *argv + *argc);
+  assert(!Args.empty());
+  ProgName = new std::string(Args[0]);
+  if (Argv0 != *ProgName) {
+
+    Printf("ERROR: argv[0] has been modified in LLVMFuzzerInitialize\n");
+    exit(1);
+
+  }
+
+  ParseFlags(Args, EF);
+  if (Flags.help) {
+
+    PrintHelp();
+    return 0;
+
+  }
+
+  if (Flags.close_fd_mask & 2) DupAndCloseStderr();
+  if (Flags.close_fd_mask & 1) CloseStdout();
+
+  if (Flags.jobs > 0 && Flags.workers == 0) {
+
+    Flags.workers = std::min(NumberOfCpuCores() / 2, Flags.jobs);
+    if (Flags.workers > 1) Printf("Running %u workers\n", Flags.workers);
+
+  }
+
+  if (Flags.workers > 0 && Flags.jobs > 0)
+    return RunInMultipleProcesses(Args, Flags.workers, Flags.jobs);
+
+  FuzzingOptions Options;
+  Options.Verbosity = Flags.verbosity;
+  Options.MaxLen = Flags.max_len;
+  Options.LenControl = Flags.len_control;
+  Options.KeepSeed = Flags.keep_seed;
+  Options.UnitTimeoutSec = Flags.timeout;
+  Options.ErrorExitCode = Flags.error_exitcode;
+  Options.TimeoutExitCode = Flags.timeout_exitcode;
+  Options.IgnoreTimeouts = Flags.ignore_timeouts;
+  Options.IgnoreOOMs = Flags.ignore_ooms;
+  Options.IgnoreCrashes = Flags.ignore_crashes;
+  Options.MaxTotalTimeSec = Flags.max_total_time;
+  Options.DoCrossOver = Flags.cross_over;
+  Options.CrossOverUniformDist = Flags.cross_over_uniform_dist;
+  Options.MutateDepth = Flags.mutate_depth;
+  Options.ReduceDepth = Flags.reduce_depth;
+  Options.UseCounters = Flags.use_counters;
+  Options.UseMemmem = Flags.use_memmem;
+  Options.UseCmp = Flags.use_cmp;
+  Options.UseValueProfile = Flags.use_value_profile;
+  Options.Shrink = Flags.shrink;
+  Options.ReduceInputs = Flags.reduce_inputs;
+  Options.ShuffleAtStartUp = Flags.shuffle;
+  Options.PreferSmall = Flags.prefer_small;
+  Options.ReloadIntervalSec = Flags.reload;
+  Options.OnlyASCII = Flags.only_ascii;
+  Options.DetectLeaks = Flags.detect_leaks;
+  Options.PurgeAllocatorIntervalSec = Flags.purge_allocator_interval;
+  Options.TraceMalloc = Flags.trace_malloc;
+  Options.RssLimitMb = Flags.rss_limit_mb;
+  Options.MallocLimitMb = Flags.malloc_limit_mb;
+  if (!Options.MallocLimitMb) Options.MallocLimitMb = Options.RssLimitMb;
+  if (Flags.runs >= 0) Options.MaxNumberOfRuns = Flags.runs;
+  if (!Inputs->empty() && !Flags.minimize_crash_internal_step) {
+
+    // Ensure output corpus assumed to be the first arbitrary argument input
+    // is not a path to an existing file.
+    std::string OutputCorpusDir = (*Inputs)[0];
+    if (!IsFile(OutputCorpusDir)) {
+
+      Options.OutputCorpus = OutputCorpusDir;
+      ValidateDirectoryExists(Options.OutputCorpus, Flags.create_missing_dirs);
+
+    }
+
+  }
+
+  Options.ReportSlowUnits = Flags.report_slow_units;
+  if (Flags.artifact_prefix) {
+
+    Options.ArtifactPrefix = Flags.artifact_prefix;
+
+    // Since the prefix could be a full path to a file name prefix, assume
+    // that if the path ends with the platform's separator that a directory
+    // is desired
+    std::string ArtifactPathDir = Options.ArtifactPrefix;
+    if (!IsSeparator(ArtifactPathDir[ArtifactPathDir.length() - 1])) {
+
+      ArtifactPathDir = DirName(ArtifactPathDir);
+
+    }
+
+    ValidateDirectoryExists(ArtifactPathDir, Flags.create_missing_dirs);
+
+  }
+
+  if (Flags.exact_artifact_path) {
+
+    Options.ExactArtifactPath = Flags.exact_artifact_path;
+    ValidateDirectoryExists(DirName(Options.ExactArtifactPath),
+                            Flags.create_missing_dirs);
+
+  }
+
+  Vector<Unit> Dictionary;
+  if (Flags.dict)
+    if (!ParseDictionaryFile(FileToString(Flags.dict), &Dictionary)) return 1;
+  if (Flags.verbosity > 0 && !Dictionary.empty())
+    Printf("Dictionary: %zd entries\n", Dictionary.size());
+  bool RunIndividualFiles = AllInputsAreFiles();
+  Options.SaveArtifacts =
+      !RunIndividualFiles || Flags.minimize_crash_internal_step;
+  Options.PrintNewCovPcs = Flags.print_pcs;
+  Options.PrintNewCovFuncs = Flags.print_funcs;
+  Options.PrintFinalStats = Flags.print_final_stats;
+  Options.PrintCorpusStats = Flags.print_corpus_stats;
+  Options.PrintCoverage = Flags.print_coverage;
+  if (Flags.exit_on_src_pos) Options.ExitOnSrcPos = Flags.exit_on_src_pos;
+  if (Flags.exit_on_item) Options.ExitOnItem = Flags.exit_on_item;
+  if (Flags.focus_function) Options.FocusFunction = Flags.focus_function;
+  if (Flags.data_flow_trace) Options.DataFlowTrace = Flags.data_flow_trace;
+  if (Flags.features_dir) {
+
+    Options.FeaturesDir = Flags.features_dir;
+    ValidateDirectoryExists(Options.FeaturesDir, Flags.create_missing_dirs);
+
+  }
+
+  if (Flags.mutation_graph_file)
+    Options.MutationGraphFile = Flags.mutation_graph_file;
+  if (Flags.collect_data_flow)
+    Options.CollectDataFlow = Flags.collect_data_flow;
+  if (Flags.stop_file) Options.StopFile = Flags.stop_file;
+  Options.Entropic = Flags.entropic;
+  Options.EntropicFeatureFrequencyThreshold =
+      (size_t)Flags.entropic_feature_frequency_threshold;
+  Options.EntropicNumberOfRarestFeatures =
+      (size_t)Flags.entropic_number_of_rarest_features;
+  Options.EntropicScalePerExecTime = Flags.entropic_scale_per_exec_time;
+  if (Options.Entropic) {
+
+    if (!Options.FocusFunction.empty()) {
+
+      Printf(
+          "ERROR: The parameters `--entropic` and `--focus_function` cannot "
+          "be used together.\n");
+      exit(1);
+
+    }
+
+    Printf("INFO: Running with entropic power schedule (0x%X, %d).\n",
+           Options.EntropicFeatureFrequencyThreshold,
+           Options.EntropicNumberOfRarestFeatures);
+
+  }
+
+  struct EntropicOptions Entropic;
+  Entropic.Enabled = Options.Entropic;
+  Entropic.FeatureFrequencyThreshold =
+      Options.EntropicFeatureFrequencyThreshold;
+  Entropic.NumberOfRarestFeatures = Options.EntropicNumberOfRarestFeatures;
+  Entropic.ScalePerExecTime = Options.EntropicScalePerExecTime;
+
+  unsigned Seed = Flags.seed;
+  // Initialize Seed.
+  if (Seed == 0)
+    Seed =
+        std::chrono::system_clock::now().time_since_epoch().count() + GetPid();
+  if (Flags.verbosity) Printf("INFO: Seed: %u\n", Seed);
+
+  if (Flags.collect_data_flow && !Flags.fork && !Flags.merge) {
+
+    if (RunIndividualFiles)
+      return CollectDataFlow(Flags.collect_data_flow, Flags.data_flow_trace,
+                             ReadCorpora({}, *Inputs));
+    else
+      return CollectDataFlow(Flags.collect_data_flow, Flags.data_flow_trace,
+                             ReadCorpora(*Inputs, {}));
+
+  }
+
+  Random Rand(Seed);
+  auto * MD = new MutationDispatcher(Rand, Options);
+  auto * Corpus = new InputCorpus(Options.OutputCorpus, Entropic);
+  auto * F = new Fuzzer(Callback, *Corpus, *MD, Options);
+
+  for (auto &U : Dictionary)
+    if (U.size() <= Word::GetMaxSize())
+      MD->AddWordToManualDictionary(Word(U.data(), U.size()));
+
+      // Threads are only supported by Chrome. Don't use them with emscripten
+      // for now.
+#if !LIBFUZZER_EMSCRIPTEN
+  StartRssThread(F, Flags.rss_limit_mb);
+#endif  // LIBFUZZER_EMSCRIPTEN
+
+  Options.HandleAbrt = Flags.handle_abrt;
+  Options.HandleAlrm = !Flags.minimize_crash;
+  Options.HandleBus = Flags.handle_bus;
+  Options.HandleFpe = Flags.handle_fpe;
+  Options.HandleIll = Flags.handle_ill;
+  Options.HandleInt = Flags.handle_int;
+  Options.HandleSegv = Flags.handle_segv;
+  Options.HandleTerm = Flags.handle_term;
+  Options.HandleXfsz = Flags.handle_xfsz;
+  Options.HandleUsr1 = Flags.handle_usr1;
+  Options.HandleUsr2 = Flags.handle_usr2;
+  SetSignalHandler(Options);
+
+  std::atexit(Fuzzer::StaticExitCallback);
+
+  if (Flags.minimize_crash) return MinimizeCrashInput(Args, Options);
+
+  if (Flags.minimize_crash_internal_step)
+    return MinimizeCrashInputInternalStep(F, Corpus);
+
+  if (Flags.cleanse_crash) return CleanseCrashInput(Args, Options);
+
+  if (RunIndividualFiles) {
+
+    Options.SaveArtifacts = false;
+    int Runs = std::max(1, Flags.runs);
+    Printf("%s: Running %zd inputs %d time(s) each.\n", ProgName->c_str(),
+           Inputs->size(), Runs);
+    for (auto &Path : *Inputs) {
+
+      auto StartTime = system_clock::now();
+      Printf("Running: %s\n", Path.c_str());
+      for (int Iter = 0; Iter < Runs; Iter++)
+        RunOneTest(F, Path.c_str(), Options.MaxLen);
+      auto StopTime = system_clock::now();
+      auto MS = duration_cast<milliseconds>(StopTime - StartTime).count();
+      Printf("Executed %s in %zd ms\n", Path.c_str(), (long)MS);
+
+    }
+
+    Printf(
+        "***\n"
+        "*** NOTE: fuzzing was not performed, you have only\n"
+        "***       executed the target code on a fixed set of inputs.\n"
+        "***\n");
+    F->PrintFinalStats();
+    exit(0);
+
+  }
+
+  if (Flags.fork)
+    FuzzWithFork(F->GetMD().GetRand(), Options, Args, *Inputs, Flags.fork);
+
+  if (Flags.merge) Merge(F, Options, Args, *Inputs, Flags.merge_control_file);
+
+  if (Flags.merge_inner) {
+
+    const size_t kDefaultMaxMergeLen = 1 << 20;
+    if (Options.MaxLen == 0) F->SetMaxInputLen(kDefaultMaxMergeLen);
+    assert(Flags.merge_control_file);
+    F->CrashResistantMergeInternalStep(Flags.merge_control_file);
+    exit(0);
+
+  }
+
+  if (Flags.analyze_dict) {
+
+    size_t     MaxLen = INT_MAX;  // Large max length.
+    UnitVector InitialCorpus;
+    for (auto &Inp : *Inputs) {
+
+      Printf("Loading corpus dir: %s\n", Inp.c_str());
+      ReadDirToVectorOfUnits(Inp.c_str(), &InitialCorpus, nullptr, MaxLen,
+                             /*ExitOnError=*/false);
+
+    }
+
+    if (Dictionary.empty() || Inputs->empty()) {
+
+      Printf("ERROR: can't analyze dict without dict and corpus provided\n");
+      return 1;
+
+    }
+
+    if (AnalyzeDictionary(F, Dictionary, InitialCorpus)) {
+
+      Printf("Dictionary analysis failed\n");
+      exit(1);
+
+    }
+
+    Printf("Dictionary analysis succeeded\n");
+    exit(0);
+
+  }
+
+  auto CorporaFiles = ReadCorpora(*Inputs, ParseSeedInuts(Flags.seed_inputs));
+  F->Loop(CorporaFiles);
+
+  if (Flags.verbosity)
+    Printf("Done %zd runs in %zd second(s)\n", F->getTotalNumberOfRuns(),
+           F->secondsSinceProcessStartUp());
+  F->PrintFinalStats();
+
+  exit(0);  // Don't let F destroy itself.
+
+}
+
+extern "C" ATTRIBUTE_INTERFACE int LLVMFuzzerRunDriver(
+    int *argc, char ***argv, int (*UserCb)(const uint8_t *Data, size_t Size)) {
+
+  return FuzzerDriver(argc, argv, UserCb);
+
+}
+
+#include "libfuzzer.inc"
+
+// Storage for global ExternalFunctions object.
+ExternalFunctions *EF = nullptr;
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctions.def b/custom_mutators/libfuzzer/FuzzerExtFunctions.def
new file mode 100644
index 00000000..51edf844
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctions.def
@@ -0,0 +1,50 @@
+//===- FuzzerExtFunctions.def - External functions --------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This defines the external function pointers that
+// ``fuzzer::ExternalFunctions`` should contain and try to initialize.  The
+// EXT_FUNC macro must be defined at the point of inclusion. The signature of
+// the macro is:
+//
+// EXT_FUNC(<name>, <return_type>, <function_signature>, <warn_if_missing>)
+//===----------------------------------------------------------------------===//
+
+// Optional user functions
+EXT_FUNC(LLVMFuzzerInitialize, int, (int *argc, char ***argv), false);
+EXT_FUNC(LLVMFuzzerCustomMutator, size_t,
+         (uint8_t *Data, size_t Size, size_t MaxSize, unsigned int Seed),
+         false);
+EXT_FUNC(LLVMFuzzerCustomCrossOver, size_t,
+         (const uint8_t *Data1, size_t Size1,
+          const uint8_t *Data2, size_t Size2,
+          uint8_t *Out, size_t MaxOutSize, unsigned int Seed),
+         false);
+
+// Sanitizer functions
+EXT_FUNC(__lsan_enable, void, (), false);
+EXT_FUNC(__lsan_disable, void, (), false);
+EXT_FUNC(__lsan_do_recoverable_leak_check, int, (), false);
+EXT_FUNC(__sanitizer_acquire_crash_state, int, (), true);
+EXT_FUNC(__sanitizer_install_malloc_and_free_hooks, int,
+         (void (*malloc_hook)(const volatile void *, size_t),
+          void (*free_hook)(const volatile void *)),
+         false);
+EXT_FUNC(__sanitizer_log_write, void, (const char *buf, size_t len), false);
+EXT_FUNC(__sanitizer_purge_allocator, void, (), false);
+EXT_FUNC(__sanitizer_print_memory_profile, void, (size_t, size_t), false);
+EXT_FUNC(__sanitizer_print_stack_trace, void, (), true);
+EXT_FUNC(__sanitizer_symbolize_pc, void,
+         (void *, const char *fmt, char *out_buf, size_t out_buf_size), false);
+EXT_FUNC(__sanitizer_get_module_and_offset_for_pc, int,
+         (void *pc, char *module_path,
+         size_t module_path_len,void **pc_offset), false);
+EXT_FUNC(__sanitizer_set_death_callback, void, (void (*)(void)), true);
+EXT_FUNC(__sanitizer_set_report_fd, void, (void*), false);
+EXT_FUNC(__msan_scoped_disable_interceptor_checks, void, (), false);
+EXT_FUNC(__msan_scoped_enable_interceptor_checks, void, (), false);
+EXT_FUNC(__msan_unpoison, void, (const volatile void *, size_t size), false);
+EXT_FUNC(__msan_unpoison_param, void, (size_t n), false);
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctions.h b/custom_mutators/libfuzzer/FuzzerExtFunctions.h
new file mode 100644
index 00000000..c88aac4e
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctions.h
@@ -0,0 +1,34 @@
+//===- FuzzerExtFunctions.h - Interface to external functions ---*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Defines an interface to (possibly optional) functions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_EXT_FUNCTIONS_H
+#define LLVM_FUZZER_EXT_FUNCTIONS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace fuzzer {
+
+struct ExternalFunctions {
+  // Initialize function pointers. Functions that are not available will be set
+  // to nullptr.  Do not call this constructor  before ``main()`` has been
+  // entered.
+  ExternalFunctions();
+
+#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                            \
+  RETURN_TYPE(*NAME) FUNC_SIG = nullptr
+
+#include "FuzzerExtFunctions.def"
+
+#undef EXT_FUNC
+};
+} // namespace fuzzer
+
+#endif
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
new file mode 100644
index 00000000..8009b237
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
@@ -0,0 +1,60 @@
+//===- FuzzerExtFunctionsDlsym.cpp - Interface to external functions ------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Implementation for operating systems that support dlsym(). We only use it on
+// Apple platforms for now. We don't use this approach on Linux because it
+// requires that clients of LibFuzzer pass ``--export-dynamic`` to the linker.
+// That is a complication we don't wish to expose to clients right now.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_APPLE
+
+  #include "FuzzerExtFunctions.h"
+  #include "FuzzerIO.h"
+  #include <dlfcn.h>
+
+using namespace fuzzer;
+
+template <typename T>
+static T GetFnPtr(const char *FnName, bool WarnIfMissing) {
+
+  dlerror();  // Clear any previous errors.
+  void *Fn = dlsym(RTLD_DEFAULT, FnName);
+  if (Fn == nullptr) {
+
+    if (WarnIfMissing) {
+
+      const char *ErrorMsg = dlerror();
+      Printf("WARNING: Failed to find function \"%s\".", FnName);
+      if (ErrorMsg) Printf(" Reason %s.", ErrorMsg);
+      Printf("\n");
+
+    }
+
+  }
+
+  return reinterpret_cast<T>(Fn);
+
+}
+
+namespace fuzzer {
+
+ExternalFunctions::ExternalFunctions() {
+\
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+    this->NAME = GetFnPtr<decltype(ExternalFunctions::NAME)>(#NAME, WARN)
+
+  #include "FuzzerExtFunctions.def"
+
+  #undef EXT_FUNC
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_APPLE
+
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
new file mode 100644
index 00000000..c7a1d05e
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
@@ -0,0 +1,63 @@
+//===- FuzzerExtFunctionsWeak.cpp - Interface to external functions -------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Implementation for Linux. This relies on the linker's support for weak
+// symbols. We don't use this approach on Apple platforms because it requires
+// clients of LibFuzzer to pass ``-U _<symbol_name>`` to the linker to allow
+// weak symbols to be undefined. That is a complication we don't want to expose
+// to clients right now.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FUCHSIA || \
+    LIBFUZZER_FREEBSD || LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN
+
+  #include "FuzzerExtFunctions.h"
+  #include "FuzzerIO.h"
+
+extern "C" {
+
+  // Declare these symbols as weak to allow them to be optionally defined.
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+    __attribute__((weak, visibility("default"))) RETURN_TYPE NAME FUNC_SIG
+
+  #include "FuzzerExtFunctions.def"
+
+  #undef EXT_FUNC
+
+}
+
+using namespace fuzzer;
+
+static void CheckFnPtr(void *FnPtr, const char *FnName, bool WarnIfMissing) {
+
+  if (FnPtr == nullptr && WarnIfMissing) {
+
+    Printf("WARNING: Failed to find function \"%s\".\n", FnName);
+
+  }
+
+}
+
+namespace fuzzer {
+
+ExternalFunctions::ExternalFunctions() {
+\
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                         \
+    this->NAME = ::NAME;                                                      \
+    CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
+               #NAME, WARN);
+
+  #include "FuzzerExtFunctions.def"
+
+  #undef EXT_FUNC
+
+}
+
+}  // namespace fuzzer
+
+#endif
+
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
new file mode 100644
index 00000000..a727220a
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
@@ -0,0 +1,95 @@
+//=== FuzzerExtWindows.cpp - Interface to external functions --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Implementation of FuzzerExtFunctions for Windows. Uses alternatename when
+// compiled with MSVC. Uses weak aliases when compiled with clang. Unfortunately
+// the method each compiler supports is not supported by the other.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_WINDOWS
+
+  #include "FuzzerExtFunctions.h"
+  #include "FuzzerIO.h"
+
+using namespace fuzzer;
+
+  // Intermediate macro to ensure the parameter is expanded before stringified.
+  #define STRINGIFY_(A) #A
+  #define STRINGIFY(A) STRINGIFY_(A)
+
+  #if LIBFUZZER_MSVC
+    // Copied from compiler-rt/lib/sanitizer_common/sanitizer_win_defs.h
+    #if defined(_M_IX86) || defined(__i386__)
+      #define WIN_SYM_PREFIX "_"
+    #else
+      #define WIN_SYM_PREFIX
+    #endif
+
+    // Declare external functions as having alternativenames, so that we can
+    // determine if they are not defined.
+    #define EXTERNAL_FUNC(Name, Default)                              \
+      __pragma(                                                       \
+          comment(linker, "/alternatename:" WIN_SYM_PREFIX STRINGIFY( \
+                              Name) "=" WIN_SYM_PREFIX STRINGIFY(Default)))
+  #else
+    // Declare external functions as weak to allow them to default to a
+    // specified function if not defined explicitly. We must use weak symbols
+    // because clang's support for alternatename is not 100%, see
+    // https://bugs.llvm.org/show_bug.cgi?id=40218 for more details.
+    #define EXTERNAL_FUNC(Name, Default) \
+      __attribute__((weak, alias(STRINGIFY(Default))))
+  #endif  // LIBFUZZER_MSVC
+
+extern "C" {
+\
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)         \
+    RETURN_TYPE NAME##Def FUNC_SIG {                          \
+                                                              \
+      Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
+      exit(1);                                                \
+                                                              \
+    }                                                         \
+    EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
+
+  #include "FuzzerExtFunctions.def"
+
+  #undef EXT_FUNC
+
+}
+
+template <typename T>
+static T *GetFnPtr(T *Fun, T *FunDef, const char *FnName, bool WarnIfMissing) {
+
+  if (Fun == FunDef) {
+
+    if (WarnIfMissing)
+      Printf("WARNING: Failed to find function \"%s\".\n", FnName);
+    return nullptr;
+
+  }
+
+  return Fun;
+
+}
+
+namespace fuzzer {
+
+ExternalFunctions::ExternalFunctions() {
+\
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+    this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
+
+  #include "FuzzerExtFunctions.def"
+
+  #undef EXT_FUNC
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_WINDOWS
+
diff --git a/custom_mutators/libfuzzer/FuzzerExtraCounters.cpp b/custom_mutators/libfuzzer/FuzzerExtraCounters.cpp
new file mode 100644
index 00000000..3ff9b0d5
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerExtraCounters.cpp
@@ -0,0 +1,71 @@
+//===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Extra coverage counters defined by user code.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerPlatform.h"
+#include <cstdint>
+
+#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \
+    LIBFUZZER_OPENBSD || LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN
+__attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters;
+__attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters;
+
+namespace fuzzer {
+
+uint8_t *ExtraCountersBegin() {
+
+  return &__start___libfuzzer_extra_counters;
+
+}
+
+uint8_t *ExtraCountersEnd() {
+
+  return &__stop___libfuzzer_extra_counters;
+
+}
+
+ATTRIBUTE_NO_SANITIZE_ALL
+void ClearExtraCounters() {  // hand-written memset, don't asan-ify.
+  uintptr_t *Beg = reinterpret_cast<uintptr_t *>(ExtraCountersBegin());
+  uintptr_t *End = reinterpret_cast<uintptr_t *>(ExtraCountersEnd());
+  for (; Beg < End; Beg++) {
+
+    *Beg = 0;
+    __asm__ __volatile__("" : : : "memory");
+
+  }
+
+}
+
+}  // namespace fuzzer
+
+#else
+// TODO: implement for other platforms.
+namespace fuzzer {
+
+uint8_t *ExtraCountersBegin() {
+
+  return nullptr;
+
+}
+
+uint8_t *ExtraCountersEnd() {
+
+  return nullptr;
+
+}
+
+void ClearExtraCounters() {
+
+}
+
+}  // namespace fuzzer
+
+#endif
+
diff --git a/custom_mutators/libfuzzer/FuzzerFlags.def b/custom_mutators/libfuzzer/FuzzerFlags.def
new file mode 100644
index 00000000..c9a787e0
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerFlags.def
@@ -0,0 +1,197 @@
+//===- FuzzerFlags.def - Run-time flags -------------------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Flags. FUZZER_FLAG_INT/FUZZER_FLAG_STRING macros should be defined at the
+// point of inclusion. We are not using any flag parsing library for better
+// portability and independence.
+//===----------------------------------------------------------------------===//
+FUZZER_FLAG_INT(verbosity, 1, "Verbosity level.")
+FUZZER_FLAG_UNSIGNED(seed, 0, "Random seed. If 0, seed is generated.")
+FUZZER_FLAG_INT(runs, -1,
+            "Number of individual test runs (-1 for infinite runs).")
+FUZZER_FLAG_INT(max_len, 0, "Maximum length of the test input. "
+    "If 0, libFuzzer tries to guess a good value based on the corpus "
+    "and reports it. ")
+FUZZER_FLAG_INT(len_control, 100, "Try generating small inputs first, "
+  "then try larger inputs over time.  Specifies the rate at which the length "
+  "limit is increased (smaller == faster).  If 0, immediately try inputs with "
+  "size up to max_len. Default value is 0, if LLVMFuzzerCustomMutator is used.")
+FUZZER_FLAG_STRING(seed_inputs, "A comma-separated list of input files "
+  "to use as an additional seed corpus. Alternatively, an \"@\" followed by "
+  "the name of a file containing the comma-separated list.")
+FUZZER_FLAG_INT(keep_seed, 0, "If 1, keep seed inputs in the corpus even if "
+  "they do not produce new coverage. When used with |reduce_inputs==1|, the "
+  "seed inputs will never be reduced. This option can be useful when seeds are"
+  "not properly formed for the fuzz target but still have useful snippets.")
+FUZZER_FLAG_INT(cross_over, 1, "If 1, cross over inputs.")
+FUZZER_FLAG_INT(cross_over_uniform_dist, 0, "Experimental. If 1, use a "
+  "uniform probability distribution when choosing inputs to cross over with. "
+  "Some of the inputs in the corpus may never get chosen for mutation "
+  "depending on the input mutation scheduling policy. With this flag, all "
+  "inputs, regardless of the input mutation scheduling policy, can be chosen "
+  "as an input to cross over with. This can be particularly useful with "
+  "|keep_seed==1|; all the initial seed inputs, even though they do not "
+  "increase coverage because they are not properly formed, will still be "
+  "chosen as an input to cross over with.")
+
+FUZZER_FLAG_INT(mutate_depth, 5,
+            "Apply this number of consecutive mutations to each input.")
+FUZZER_FLAG_INT(reduce_depth, 0, "Experimental/internal. "
+                "Reduce depth if mutations lose unique features")
+FUZZER_FLAG_INT(shuffle, 1, "Shuffle inputs at startup")
+FUZZER_FLAG_INT(prefer_small, 1,
+    "If 1, always prefer smaller inputs during the corpus shuffle.")
+FUZZER_FLAG_INT(
+    timeout, 1200,
+    "Timeout in seconds (if positive). "
+    "If one unit runs more than this number of seconds the process will abort.")
+FUZZER_FLAG_INT(error_exitcode, 77, "When libFuzzer itself reports a bug "
+  "this exit code will be used.")
+FUZZER_FLAG_INT(timeout_exitcode, 70, "When libFuzzer reports a timeout "
+  "this exit code will be used.")
+FUZZER_FLAG_INT(max_total_time, 0, "If positive, indicates the maximal total "
+                                   "time in seconds to run the fuzzer.")
+FUZZER_FLAG_INT(help, 0, "Print help.")
+FUZZER_FLAG_INT(fork, 0, "Experimental mode where fuzzing happens "
+                "in a subprocess")
+FUZZER_FLAG_INT(ignore_timeouts, 1, "Ignore timeouts in fork mode")
+FUZZER_FLAG_INT(ignore_ooms, 1, "Ignore OOMs in fork mode")
+FUZZER_FLAG_INT(ignore_crashes, 0, "Ignore crashes in fork mode")
+FUZZER_FLAG_INT(merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be "
+  "merged into the 1-st corpus. Only interesting units will be taken. "
+  "This flag can be used to minimize a corpus.")
+FUZZER_FLAG_STRING(stop_file, "Stop fuzzing ASAP if this file exists")
+FUZZER_FLAG_STRING(merge_inner, "internal flag")
+FUZZER_FLAG_STRING(merge_control_file,
+                   "Specify a control file used for the merge process. "
+                   "If a merge process gets killed it tries to leave this file "
+                   "in a state suitable for resuming the merge. "
+                   "By default a temporary file will be used."
+                   "The same file can be used for multistep merge process.")
+FUZZER_FLAG_INT(minimize_crash, 0, "If 1, minimizes the provided"
+  " crash input. Use with -runs=N or -max_total_time=N to limit "
+  "the number attempts."
+  " Use with -exact_artifact_path to specify the output."
+  " Combine with ASAN_OPTIONS=dedup_token_length=3 (or similar) to ensure that"
+  " the minimized input triggers the same crash."
+  )
+FUZZER_FLAG_INT(cleanse_crash, 0, "If 1, tries to cleanse the provided"
+  " crash input to make it contain fewer original bytes."
+  " Use with -exact_artifact_path to specify the output."
+  )
+FUZZER_FLAG_INT(minimize_crash_internal_step, 0, "internal flag")
+FUZZER_FLAG_STRING(features_dir, "internal flag. Used to dump feature sets on disk."
+  "Every time a new input is added to the corpus, a corresponding file in the features_dir"
+  " is created containing the unique features of that input."
+  " Features are stored in binary format.")
+FUZZER_FLAG_STRING(mutation_graph_file, "Saves a graph (in DOT format) to"
+  " mutation_graph_file. The graph contains a vertex for each input that has"
+  " unique coverage; directed edges are provided between parents and children"
+  " where the child has unique coverage, and are recorded with the type of"
+  " mutation that caused the child.")
+FUZZER_FLAG_INT(use_counters, 1, "Use coverage counters")
+FUZZER_FLAG_INT(use_memmem, 1,
+                "Use hints from intercepting memmem, strstr, etc")
+FUZZER_FLAG_INT(use_value_profile, 0,
+                "Experimental. Use value profile to guide fuzzing.")
+FUZZER_FLAG_INT(use_cmp, 1, "Use CMP traces to guide mutations")
+FUZZER_FLAG_INT(shrink, 0, "Experimental. Try to shrink corpus inputs.")
+FUZZER_FLAG_INT(reduce_inputs, 1,
+  "Try to reduce the size of inputs while preserving their full feature sets")
+FUZZER_FLAG_UNSIGNED(jobs, 0, "Number of jobs to run. If jobs >= 1 we spawn"
+                          " this number of jobs in separate worker processes"
+                          " with stdout/stderr redirected to fuzz-JOB.log.")
+FUZZER_FLAG_UNSIGNED(workers, 0,
+            "Number of simultaneous worker processes to run the jobs."
+            " If zero, \"min(jobs,NumberOfCpuCores()/2)\" is used.")
+FUZZER_FLAG_INT(reload, 1,
+                "Reload the main corpus every <N> seconds to get new units"
+                " discovered by other processes. If 0, disabled")
+FUZZER_FLAG_INT(report_slow_units, 10,
+    "Report slowest units if they run for more than this number of seconds.")
+FUZZER_FLAG_INT(only_ascii, 0,
+                "If 1, generate only ASCII (isprint+isspace) inputs.")
+FUZZER_FLAG_STRING(dict, "Experimental. Use the dictionary file.")
+FUZZER_FLAG_STRING(artifact_prefix, "Write fuzzing artifacts (crash, "
+                                    "timeout, or slow inputs) as "
+                                    "$(artifact_prefix)file")
+FUZZER_FLAG_STRING(exact_artifact_path,
+                   "Write the single artifact on failure (crash, timeout) "
+                   "as $(exact_artifact_path). This overrides -artifact_prefix "
+                   "and will not use checksum in the file name. Do not "
+                   "use the same path for several parallel processes.")
+FUZZER_FLAG_INT(print_pcs, 0, "If 1, print out newly covered PCs.")
+FUZZER_FLAG_INT(print_funcs, 2, "If >=1, print out at most this number of "
+                                "newly covered functions.")
+FUZZER_FLAG_INT(print_final_stats, 0, "If 1, print statistics at exit.")
+FUZZER_FLAG_INT(print_corpus_stats, 0,
+  "If 1, print statistics on corpus elements at exit.")
+FUZZER_FLAG_INT(print_coverage, 0, "If 1, print coverage information as text"
+                                   " at exit.")
+FUZZER_FLAG_INT(dump_coverage, 0, "Deprecated.")
+FUZZER_FLAG_INT(handle_segv, 1, "If 1, try to intercept SIGSEGV.")
+FUZZER_FLAG_INT(handle_bus, 1, "If 1, try to intercept SIGBUS.")
+FUZZER_FLAG_INT(handle_abrt, 1, "If 1, try to intercept SIGABRT.")
+FUZZER_FLAG_INT(handle_ill, 1, "If 1, try to intercept SIGILL.")
+FUZZER_FLAG_INT(handle_fpe, 1, "If 1, try to intercept SIGFPE.")
+FUZZER_FLAG_INT(handle_int, 1, "If 1, try to intercept SIGINT.")
+FUZZER_FLAG_INT(handle_term, 1, "If 1, try to intercept SIGTERM.")
+FUZZER_FLAG_INT(handle_xfsz, 1, "If 1, try to intercept SIGXFSZ.")
+FUZZER_FLAG_INT(handle_usr1, 1, "If 1, try to intercept SIGUSR1.")
+FUZZER_FLAG_INT(handle_usr2, 1, "If 1, try to intercept SIGUSR2.")
+FUZZER_FLAG_INT(close_fd_mask, 0, "If 1, close stdout at startup; "
+    "if 2, close stderr; if 3, close both. "
+    "Be careful, this will also close e.g. stderr of asan.")
+FUZZER_FLAG_INT(detect_leaks, 1, "If 1, and if LeakSanitizer is enabled "
+    "try to detect memory leaks during fuzzing (i.e. not only at shut down).")
+FUZZER_FLAG_INT(purge_allocator_interval, 1, "Purge allocator caches and "
+    "quarantines every <N> seconds. When rss_limit_mb is specified (>0), "
+    "purging starts when RSS exceeds 50% of rss_limit_mb. Pass "
+    "purge_allocator_interval=-1 to disable this functionality.")
+FUZZER_FLAG_INT(trace_malloc, 0, "If >= 1 will print all mallocs/frees. "
+    "If >= 2 will also print stack traces.")
+FUZZER_FLAG_INT(rss_limit_mb, 2048, "If non-zero, the fuzzer will exit upon"
+    "reaching this limit of RSS memory usage.")
+FUZZER_FLAG_INT(malloc_limit_mb, 0, "If non-zero, the fuzzer will exit "
+    "if the target tries to allocate this number of Mb with one malloc call. "
+    "If zero (default) same limit as rss_limit_mb is applied.")
+FUZZER_FLAG_STRING(exit_on_src_pos, "Exit if a newly found PC originates"
+    " from the given source location. Example: -exit_on_src_pos=foo.cc:123. "
+    "Used primarily for testing libFuzzer itself.")
+FUZZER_FLAG_STRING(exit_on_item, "Exit if an item with a given sha1 sum"
+    " was added to the corpus. "
+    "Used primarily for testing libFuzzer itself.")
+FUZZER_FLAG_INT(ignore_remaining_args, 0, "If 1, ignore all arguments passed "
+                "after this one. Useful for fuzzers that need to do their own "
+                "argument parsing.")
+FUZZER_FLAG_STRING(focus_function, "Experimental. "
+     "Fuzzing will focus on inputs that trigger calls to this function. "
+     "If -focus_function=auto and -data_flow_trace is used, libFuzzer "
+     "will choose the focus functions automatically.")
+FUZZER_FLAG_INT(entropic, 0, "Experimental. Enables entropic power schedule.")
+FUZZER_FLAG_INT(entropic_feature_frequency_threshold, 0xFF, "Experimental. If "
+     "entropic is enabled, all features which are observed less often than "
+     "the specified value are considered as rare.")
+FUZZER_FLAG_INT(entropic_number_of_rarest_features, 100, "Experimental. If "
+     "entropic is enabled, we keep track of the frequencies only for the "
+     "Top-X least abundant features (union features that are considered as "
+     "rare).")
+FUZZER_FLAG_INT(entropic_scale_per_exec_time, 0, "Experimental. If 1, "
+     "the Entropic power schedule gets scaled based on the input execution "
+     "time. Inputs with lower execution time get scheduled more (up to 30x). "
+     "Note that, if 1, fuzzer stops from being deterministic even if a "
+     "non-zero random seed is given.")
+
+FUZZER_FLAG_INT(analyze_dict, 0, "Experimental")
+FUZZER_DEPRECATED_FLAG(use_clang_coverage)
+FUZZER_FLAG_STRING(data_flow_trace, "Experimental: use the data flow trace")
+FUZZER_FLAG_STRING(collect_data_flow,
+                   "Experimental: collect the data flow trace")
+
+FUZZER_FLAG_INT(create_missing_dirs, 0, "Automatically attempt to create "
+     "directories for arguments that would normally expect them to already "
+     "exist (i.e. artifact_prefix, exact_artifact_path, features_dir, corpus)")
diff --git a/custom_mutators/libfuzzer/FuzzerFork.cpp b/custom_mutators/libfuzzer/FuzzerFork.cpp
new file mode 100644
index 00000000..d6ffed74
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerFork.cpp
@@ -0,0 +1,501 @@
+//===- FuzzerFork.cpp - run fuzzing in separate subprocesses --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Spawn and orchestrate separate fuzzing processes.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerCommand.h"
+#include "FuzzerFork.h"
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include "FuzzerMerge.h"
+#include "FuzzerSHA1.h"
+#include "FuzzerTracePC.h"
+#include "FuzzerUtil.h"
+
+#include <atomic>
+#include <chrono>
+#include <condition_variable>
+#include <fstream>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <sstream>
+#include <thread>
+
+namespace fuzzer {
+
+struct Stats {
+
+  size_t number_of_executed_units = 0;
+  size_t peak_rss_mb = 0;
+  size_t average_exec_per_sec = 0;
+
+};
+
+static Stats ParseFinalStatsFromLog(const std::string &LogPath) {
+
+  std::ifstream In(LogPath);
+  std::string   Line;
+  Stats         Res;
+  struct {
+
+    const char *Name;
+    size_t *    Var;
+
+  } NameVarPairs[] = {
+
+      {"stat::number_of_executed_units:", &Res.number_of_executed_units},
+      {"stat::peak_rss_mb:", &Res.peak_rss_mb},
+      {"stat::average_exec_per_sec:", &Res.average_exec_per_sec},
+      {nullptr, nullptr},
+
+  };
+
+  while (std::getline(In, Line, '\n')) {
+
+    if (Line.find("stat::") != 0) continue;
+    std::istringstream ISS(Line);
+    std::string        Name;
+    size_t             Val;
+    ISS >> Name >> Val;
+    for (size_t i = 0; NameVarPairs[i].Name; i++)
+      if (Name == NameVarPairs[i].Name) *NameVarPairs[i].Var = Val;
+
+  }
+
+  return Res;
+
+}
+
+struct FuzzJob {
+
+  // Inputs.
+  Command     Cmd;
+  std::string CorpusDir;
+  std::string FeaturesDir;
+  std::string LogPath;
+  std::string SeedListPath;
+  std::string CFPath;
+  size_t      JobId;
+
+  int DftTimeInSeconds = 0;
+
+  // Fuzzing Outputs.
+  int ExitCode;
+
+  ~FuzzJob() {
+
+    RemoveFile(CFPath);
+    RemoveFile(LogPath);
+    RemoveFile(SeedListPath);
+    RmDirRecursive(CorpusDir);
+    RmDirRecursive(FeaturesDir);
+
+  }
+
+};
+
+struct GlobalEnv {
+
+  Vector<std::string>                   Args;
+  Vector<std::string>                   CorpusDirs;
+  std::string                           MainCorpusDir;
+  std::string                           TempDir;
+  std::string                           DFTDir;
+  std::string                           DataFlowBinary;
+  Set<uint32_t>                         Features, Cov;
+  Set<std::string>                      FilesWithDFT;
+  Vector<std::string>                   Files;
+  Random *                              Rand;
+  std::chrono::system_clock::time_point ProcessStartTime;
+  int                                   Verbosity = 0;
+
+  size_t NumTimeouts = 0;
+  size_t NumOOMs = 0;
+  size_t NumCrashes = 0;
+
+  size_t NumRuns = 0;
+
+  std::string StopFile() {
+
+    return DirPlusFile(TempDir, "STOP");
+
+  }
+
+  size_t secondsSinceProcessStartUp() const {
+
+    return std::chrono::duration_cast<std::chrono::seconds>(
+               std::chrono::system_clock::now() - ProcessStartTime)
+        .count();
+
+  }
+
+  FuzzJob *CreateNewJob(size_t JobId) {
+
+    Command Cmd(Args);
+    Cmd.removeFlag("fork");
+    Cmd.removeFlag("runs");
+    Cmd.removeFlag("collect_data_flow");
+    for (auto &C : CorpusDirs)  // Remove all corpora from the args.
+      Cmd.removeArgument(C);
+    Cmd.addFlag("reload", "0");  // working in an isolated dir, no reload.
+    Cmd.addFlag("print_final_stats", "1");
+    Cmd.addFlag("print_funcs", "0");  // no need to spend time symbolizing.
+    Cmd.addFlag("max_total_time", std::to_string(std::min((size_t)300, JobId)));
+    Cmd.addFlag("stop_file", StopFile());
+    if (!DataFlowBinary.empty()) {
+
+      Cmd.addFlag("data_flow_trace", DFTDir);
+      if (!Cmd.hasFlag("focus_function")) Cmd.addFlag("focus_function", "auto");
+
+    }
+
+    auto        Job = new FuzzJob;
+    std::string Seeds;
+    if (size_t CorpusSubsetSize =
+            std::min(Files.size(), (size_t)sqrt(Files.size() + 2))) {
+
+      auto Time1 = std::chrono::system_clock::now();
+      for (size_t i = 0; i < CorpusSubsetSize; i++) {
+
+        auto &SF = Files[Rand->SkewTowardsLast(Files.size())];
+        Seeds += (Seeds.empty() ? "" : ",") + SF;
+        CollectDFT(SF);
+
+      }
+
+      auto Time2 = std::chrono::system_clock::now();
+      Job->DftTimeInSeconds = duration_cast<seconds>(Time2 - Time1).count();
+
+    }
+
+    if (!Seeds.empty()) {
+
+      Job->SeedListPath =
+          DirPlusFile(TempDir, std::to_string(JobId) + ".seeds");
+      WriteToFile(Seeds, Job->SeedListPath);
+      Cmd.addFlag("seed_inputs", "@" + Job->SeedListPath);
+
+    }
+
+    Job->LogPath = DirPlusFile(TempDir, std::to_string(JobId) + ".log");
+    Job->CorpusDir = DirPlusFile(TempDir, "C" + std::to_string(JobId));
+    Job->FeaturesDir = DirPlusFile(TempDir, "F" + std::to_string(JobId));
+    Job->CFPath = DirPlusFile(TempDir, std::to_string(JobId) + ".merge");
+    Job->JobId = JobId;
+
+    Cmd.addArgument(Job->CorpusDir);
+    Cmd.addFlag("features_dir", Job->FeaturesDir);
+
+    for (auto &D : {Job->CorpusDir, Job->FeaturesDir}) {
+
+      RmDirRecursive(D);
+      MkDir(D);
+
+    }
+
+    Cmd.setOutputFile(Job->LogPath);
+    Cmd.combineOutAndErr();
+
+    Job->Cmd = Cmd;
+
+    if (Verbosity >= 2)
+      Printf("Job %zd/%p Created: %s\n", JobId, Job,
+             Job->Cmd.toString().c_str());
+    // Start from very short runs and gradually increase them.
+    return Job;
+
+  }
+
+  void RunOneMergeJob(FuzzJob *Job) {
+
+    auto Stats = ParseFinalStatsFromLog(Job->LogPath);
+    NumRuns += Stats.number_of_executed_units;
+
+    Vector<SizedFile> TempFiles, MergeCandidates;
+    // Read all newly created inputs and their feature sets.
+    // Choose only those inputs that have new features.
+    GetSizedFilesFromDir(Job->CorpusDir, &TempFiles);
+    std::sort(TempFiles.begin(), TempFiles.end());
+    for (auto &F : TempFiles) {
+
+      auto FeatureFile = F.File;
+      FeatureFile.replace(0, Job->CorpusDir.size(), Job->FeaturesDir);
+      auto FeatureBytes = FileToVector(FeatureFile, 0, false);
+      assert((FeatureBytes.size() % sizeof(uint32_t)) == 0);
+      Vector<uint32_t> NewFeatures(FeatureBytes.size() / sizeof(uint32_t));
+      memcpy(NewFeatures.data(), FeatureBytes.data(), FeatureBytes.size());
+      for (auto Ft : NewFeatures) {
+
+        if (!Features.count(Ft)) {
+
+          MergeCandidates.push_back(F);
+          break;
+
+        }
+
+      }
+
+    }
+
+    // if (!FilesToAdd.empty() || Job->ExitCode != 0)
+    Printf(
+        "#%zd: cov: %zd ft: %zd corp: %zd exec/s %zd "
+        "oom/timeout/crash: %zd/%zd/%zd time: %zds job: %zd dft_time: %d\n",
+        NumRuns, Cov.size(), Features.size(), Files.size(),
+        Stats.average_exec_per_sec, NumOOMs, NumTimeouts, NumCrashes,
+        secondsSinceProcessStartUp(), Job->JobId, Job->DftTimeInSeconds);
+
+    if (MergeCandidates.empty()) return;
+
+    Vector<std::string> FilesToAdd;
+    Set<uint32_t>       NewFeatures, NewCov;
+    CrashResistantMerge(Args, {}, MergeCandidates, &FilesToAdd, Features,
+                        &NewFeatures, Cov, &NewCov, Job->CFPath, false);
+    for (auto &Path : FilesToAdd) {
+
+      auto U = FileToVector(Path);
+      auto NewPath = DirPlusFile(MainCorpusDir, Hash(U));
+      WriteToFile(U, NewPath);
+      Files.push_back(NewPath);
+
+    }
+
+    Features.insert(NewFeatures.begin(), NewFeatures.end());
+    Cov.insert(NewCov.begin(), NewCov.end());
+    for (auto Idx : NewCov)
+      if (auto *TE = TPC.PCTableEntryByIdx(Idx))
+        if (TPC.PcIsFuncEntry(TE))
+          PrintPC("  NEW_FUNC: %p %F %L\n", "",
+                  TPC.GetNextInstructionPc(TE->PC));
+
+  }
+
+  void CollectDFT(const std::string &InputPath) {
+
+    if (DataFlowBinary.empty()) return;
+    if (!FilesWithDFT.insert(InputPath).second) return;
+    Command Cmd(Args);
+    Cmd.removeFlag("fork");
+    Cmd.removeFlag("runs");
+    Cmd.addFlag("data_flow_trace", DFTDir);
+    Cmd.addArgument(InputPath);
+    for (auto &C : CorpusDirs)  // Remove all corpora from the args.
+      Cmd.removeArgument(C);
+    Cmd.setOutputFile(DirPlusFile(TempDir, "dft.log"));
+    Cmd.combineOutAndErr();
+    // Printf("CollectDFT: %s\n", Cmd.toString().c_str());
+    ExecuteCommand(Cmd);
+
+  }
+
+};
+
+struct JobQueue {
+
+  std::queue<FuzzJob *>   Qu;
+  std::mutex              Mu;
+  std::condition_variable Cv;
+
+  void Push(FuzzJob *Job) {
+
+    {
+
+      std::lock_guard<std::mutex> Lock(Mu);
+      Qu.push(Job);
+
+    }
+
+    Cv.notify_one();
+
+  }
+
+  FuzzJob *Pop() {
+
+    std::unique_lock<std::mutex> Lk(Mu);
+    // std::lock_guard<std::mutex> Lock(Mu);
+    Cv.wait(Lk, [&] { return !Qu.empty(); });
+    assert(!Qu.empty());
+    auto Job = Qu.front();
+    Qu.pop();
+    return Job;
+
+  }
+
+};
+
+void WorkerThread(JobQueue *FuzzQ, JobQueue *MergeQ) {
+
+  while (auto Job = FuzzQ->Pop()) {
+
+    // Printf("WorkerThread: job %p\n", Job);
+    Job->ExitCode = ExecuteCommand(Job->Cmd);
+    MergeQ->Push(Job);
+
+  }
+
+}
+
+// This is just a skeleton of an experimental -fork=1 feature.
+void FuzzWithFork(Random &Rand, const FuzzingOptions &Options,
+                  const Vector<std::string> &Args,
+                  const Vector<std::string> &CorpusDirs, int NumJobs) {
+
+  Printf("INFO: -fork=%d: fuzzing in separate process(s)\n", NumJobs);
+
+  GlobalEnv Env;
+  Env.Args = Args;
+  Env.CorpusDirs = CorpusDirs;
+  Env.Rand = &Rand;
+  Env.Verbosity = Options.Verbosity;
+  Env.ProcessStartTime = std::chrono::system_clock::now();
+  Env.DataFlowBinary = Options.CollectDataFlow;
+
+  Vector<SizedFile> SeedFiles;
+  for (auto &Dir : CorpusDirs)
+    GetSizedFilesFromDir(Dir, &SeedFiles);
+  std::sort(SeedFiles.begin(), SeedFiles.end());
+  Env.TempDir = TempPath("FuzzWithFork", ".dir");
+  Env.DFTDir = DirPlusFile(Env.TempDir, "DFT");
+  RmDirRecursive(Env.TempDir);  // in case there is a leftover from old runs.
+  MkDir(Env.TempDir);
+  MkDir(Env.DFTDir);
+
+  if (CorpusDirs.empty())
+    MkDir(Env.MainCorpusDir = DirPlusFile(Env.TempDir, "C"));
+  else
+    Env.MainCorpusDir = CorpusDirs[0];
+
+  if (Options.KeepSeed) {
+
+    for (auto &File : SeedFiles)
+      Env.Files.push_back(File.File);
+
+  } else {
+
+    auto CFPath = DirPlusFile(Env.TempDir, "merge.txt");
+    CrashResistantMerge(Env.Args, {}, SeedFiles, &Env.Files, {}, &Env.Features,
+                        {}, &Env.Cov, CFPath, false);
+    RemoveFile(CFPath);
+
+  }
+
+  Printf("INFO: -fork=%d: %zd seed inputs, starting to fuzz in %s\n", NumJobs,
+         Env.Files.size(), Env.TempDir.c_str());
+
+  int ExitCode = 0;
+
+  JobQueue FuzzQ, MergeQ;
+
+  auto StopJobs = [&]() {
+
+    for (int i = 0; i < NumJobs; i++)
+      FuzzQ.Push(nullptr);
+    MergeQ.Push(nullptr);
+    WriteToFile(Unit({1}), Env.StopFile());
+
+  };
+
+  size_t              JobId = 1;
+  Vector<std::thread> Threads;
+  for (int t = 0; t < NumJobs; t++) {
+
+    Threads.push_back(std::thread(WorkerThread, &FuzzQ, &MergeQ));
+    FuzzQ.Push(Env.CreateNewJob(JobId++));
+
+  }
+
+  while (true) {
+
+    std::unique_ptr<FuzzJob> Job(MergeQ.Pop());
+    if (!Job) break;
+    ExitCode = Job->ExitCode;
+    if (ExitCode == Options.InterruptExitCode) {
+
+      Printf("==%lu== libFuzzer: a child was interrupted; exiting\n", GetPid());
+      StopJobs();
+      break;
+
+    }
+
+    Fuzzer::MaybeExitGracefully();
+
+    Env.RunOneMergeJob(Job.get());
+
+    // Continue if our crash is one of the ignorred ones.
+    if (Options.IgnoreTimeouts && ExitCode == Options.TimeoutExitCode)
+      Env.NumTimeouts++;
+    else if (Options.IgnoreOOMs && ExitCode == Options.OOMExitCode)
+      Env.NumOOMs++;
+    else if (ExitCode != 0) {
+
+      Env.NumCrashes++;
+      if (Options.IgnoreCrashes) {
+
+        std::ifstream In(Job->LogPath);
+        std::string   Line;
+        while (std::getline(In, Line, '\n'))
+          if (Line.find("ERROR:") != Line.npos ||
+              Line.find("runtime error:") != Line.npos)
+            Printf("%s\n", Line.c_str());
+
+      } else {
+
+        // And exit if we don't ignore this crash.
+        Printf("INFO: log from the inner process:\n%s",
+               FileToString(Job->LogPath).c_str());
+        StopJobs();
+        break;
+
+      }
+
+    }
+
+    // Stop if we are over the time budget.
+    // This is not precise, since other threads are still running
+    // and we will wait while joining them.
+    // We also don't stop instantly: other jobs need to finish.
+    if (Options.MaxTotalTimeSec > 0 &&
+        Env.secondsSinceProcessStartUp() >= (size_t)Options.MaxTotalTimeSec) {
+
+      Printf("INFO: fuzzed for %zd seconds, wrapping up soon\n",
+             Env.secondsSinceProcessStartUp());
+      StopJobs();
+      break;
+
+    }
+
+    if (Env.NumRuns >= Options.MaxNumberOfRuns) {
+
+      Printf("INFO: fuzzed for %zd iterations, wrapping up soon\n",
+             Env.NumRuns);
+      StopJobs();
+      break;
+
+    }
+
+    FuzzQ.Push(Env.CreateNewJob(JobId++));
+
+  }
+
+  for (auto &T : Threads)
+    T.join();
+
+  // The workers have terminated. Don't try to remove the directory before they
+  // terminate to avoid a race condition preventing cleanup on Windows.
+  RmDirRecursive(Env.TempDir);
+
+  // Use the exit code from the last child process.
+  Printf("INFO: exiting: %d time: %zds\n", ExitCode,
+         Env.secondsSinceProcessStartUp());
+  exit(ExitCode);
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerFork.h b/custom_mutators/libfuzzer/FuzzerFork.h
new file mode 100644
index 00000000..b29a43e1
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerFork.h
@@ -0,0 +1,24 @@
+//===- FuzzerFork.h - run fuzzing in sub-processes --------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_FORK_H
+#define LLVM_FUZZER_FORK_H
+
+#include "FuzzerDefs.h"
+#include "FuzzerOptions.h"
+#include "FuzzerRandom.h"
+
+#include <string>
+
+namespace fuzzer {
+void FuzzWithFork(Random &Rand, const FuzzingOptions &Options,
+                  const Vector<std::string> &Args,
+                  const Vector<std::string> &CorpusDirs, int NumJobs);
+} // namespace fuzzer
+
+#endif // LLVM_FUZZER_FORK_H
diff --git a/custom_mutators/libfuzzer/FuzzerIO.cpp b/custom_mutators/libfuzzer/FuzzerIO.cpp
new file mode 100644
index 00000000..e0c15db4
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerIO.cpp
@@ -0,0 +1,248 @@
+//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// IO functions.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#include "FuzzerExtFunctions.h"
+#include "FuzzerIO.h"
+#include "FuzzerUtil.h"
+#include <algorithm>
+#include <cstdarg>
+#include <fstream>
+#include <iterator>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+namespace fuzzer {
+
+static FILE *OutputFile = stderr;
+
+long GetEpoch(const std::string &Path) {
+
+  struct stat St;
+  if (stat(Path.c_str(), &St)) return 0;  // Can't stat, be conservative.
+  return St.st_mtime;
+
+}
+
+Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
+
+  std::ifstream T(Path, std::ios::binary);
+  if (ExitOnError && !T) {
+
+    Printf("No such directory: %s; exiting\n", Path.c_str());
+    exit(1);
+
+  }
+
+  T.seekg(0, T.end);
+  auto EndPos = T.tellg();
+  if (EndPos < 0) return {};
+  size_t FileLen = EndPos;
+  if (MaxSize) FileLen = std::min(FileLen, MaxSize);
+
+  T.seekg(0, T.beg);
+  Unit Res(FileLen);
+  T.read(reinterpret_cast<char *>(Res.data()), FileLen);
+  return Res;
+
+}
+
+std::string FileToString(const std::string &Path) {
+
+  std::ifstream T(Path, std::ios::binary);
+  return std::string((std::istreambuf_iterator<char>(T)),
+                     std::istreambuf_iterator<char>());
+
+}
+
+void CopyFileToErr(const std::string &Path) {
+
+  Printf("%s", FileToString(Path).c_str());
+
+}
+
+void WriteToFile(const Unit &U, const std::string &Path) {
+
+  WriteToFile(U.data(), U.size(), Path);
+
+}
+
+void WriteToFile(const std::string &Data, const std::string &Path) {
+
+  WriteToFile(reinterpret_cast<const uint8_t *>(Data.c_str()), Data.size(),
+              Path);
+
+}
+
+void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
+
+  // Use raw C interface because this function may be called from a sig handler.
+  FILE *Out = fopen(Path.c_str(), "wb");
+  if (!Out) return;
+  fwrite(Data, sizeof(Data[0]), Size, Out);
+  fclose(Out);
+
+}
+
+void AppendToFile(const std::string &Data, const std::string &Path) {
+
+  AppendToFile(reinterpret_cast<const uint8_t *>(Data.data()), Data.size(),
+               Path);
+
+}
+
+void AppendToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
+
+  FILE *Out = fopen(Path.c_str(), "a");
+  if (!Out) return;
+  fwrite(Data, sizeof(Data[0]), Size, Out);
+  fclose(Out);
+
+}
+
+void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V, long *Epoch,
+                            size_t MaxSize, bool ExitOnError) {
+
+  long                E = Epoch ? *Epoch : 0;
+  Vector<std::string> Files;
+  ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/ true);
+  size_t NumLoaded = 0;
+  for (size_t i = 0; i < Files.size(); i++) {
+
+    auto &X = Files[i];
+    if (Epoch && GetEpoch(X) < E) continue;
+    NumLoaded++;
+    if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
+      Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
+    auto S = FileToVector(X, MaxSize, ExitOnError);
+    if (!S.empty()) V->push_back(S);
+
+  }
+
+}
+
+void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) {
+
+  Vector<std::string> Files;
+  ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/ true);
+  for (auto &File : Files)
+    if (size_t Size = FileSize(File)) V->push_back({File, Size});
+
+}
+
+std::string DirPlusFile(const std::string &DirPath,
+                        const std::string &FileName) {
+
+  return DirPath + GetSeparator() + FileName;
+
+}
+
+void DupAndCloseStderr() {
+
+  int OutputFd = DuplicateFile(2);
+  if (OutputFd >= 0) {
+
+    FILE *NewOutputFile = OpenFile(OutputFd, "w");
+    if (NewOutputFile) {
+
+      OutputFile = NewOutputFile;
+      if (EF->__sanitizer_set_report_fd)
+        EF->__sanitizer_set_report_fd(
+            reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));
+      DiscardOutput(2);
+
+    }
+
+  }
+
+}
+
+void CloseStdout() {
+
+  DiscardOutput(1);
+
+}
+
+void Printf(const char *Fmt, ...) {
+
+  va_list ap;
+  va_start(ap, Fmt);
+  vfprintf(OutputFile, Fmt, ap);
+  va_end(ap);
+  fflush(OutputFile);
+
+}
+
+void VPrintf(bool Verbose, const char *Fmt, ...) {
+
+  if (!Verbose) return;
+  va_list ap;
+  va_start(ap, Fmt);
+  vfprintf(OutputFile, Fmt, ap);
+  va_end(ap);
+  fflush(OutputFile);
+
+}
+
+static bool MkDirRecursiveInner(const std::string &Leaf) {
+
+  // Prevent chance of potential infinite recursion
+  if (Leaf == ".") return true;
+
+  const std::string &Dir = DirName(Leaf);
+
+  if (IsDirectory(Dir)) {
+
+    MkDir(Leaf);
+    return IsDirectory(Leaf);
+
+  }
+
+  bool ret = MkDirRecursiveInner(Dir);
+  if (!ret) {
+
+    // Give up early if a previous MkDir failed
+    return ret;
+
+  }
+
+  MkDir(Leaf);
+  return IsDirectory(Leaf);
+
+}
+
+bool MkDirRecursive(const std::string &Dir) {
+
+  if (Dir.empty()) return false;
+
+  if (IsDirectory(Dir)) return true;
+
+  return MkDirRecursiveInner(Dir);
+
+}
+
+void RmDirRecursive(const std::string &Dir) {
+
+  IterateDirRecursive(
+      Dir, [](const std::string &Path) {},
+      [](const std::string &Path) { RmDir(Path); },
+      [](const std::string &Path) { RemoveFile(Path); });
+
+}
+
+std::string TempPath(const char *Prefix, const char *Extension) {
+
+  return DirPlusFile(TmpDir(), std::string("libFuzzerTemp.") + Prefix +
+                                   std::to_string(GetPid()) + Extension);
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerIO.h b/custom_mutators/libfuzzer/FuzzerIO.h
new file mode 100644
index 00000000..abd25110
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerIO.h
@@ -0,0 +1,112 @@
+//===- FuzzerIO.h - Internal header for IO utils ----------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// IO interface.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_IO_H
+#define LLVM_FUZZER_IO_H
+
+#include "FuzzerDefs.h"
+
+namespace fuzzer {
+
+long GetEpoch(const std::string &Path);
+
+Unit FileToVector(const std::string &Path, size_t MaxSize = 0,
+                  bool ExitOnError = true);
+
+std::string FileToString(const std::string &Path);
+
+void CopyFileToErr(const std::string &Path);
+
+void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path);
+// Write Data.c_str() to the file without terminating null character.
+void WriteToFile(const std::string &Data, const std::string &Path);
+void WriteToFile(const Unit &U, const std::string &Path);
+
+void AppendToFile(const uint8_t *Data, size_t Size, const std::string &Path);
+void AppendToFile(const std::string &Data, const std::string &Path);
+
+void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V,
+                            long *Epoch, size_t MaxSize, bool ExitOnError);
+
+// Returns "Dir/FileName" or equivalent for the current OS.
+std::string DirPlusFile(const std::string &DirPath,
+                        const std::string &FileName);
+
+// Returns the name of the dir, similar to the 'dirname' utility.
+std::string DirName(const std::string &FileName);
+
+// Returns path to a TmpDir.
+std::string TmpDir();
+
+std::string TempPath(const char *Prefix, const char *Extension);
+
+bool IsInterestingCoverageFile(const std::string &FileName);
+
+void DupAndCloseStderr();
+
+void CloseStdout();
+
+void Printf(const char *Fmt, ...);
+void VPrintf(bool Verbose, const char *Fmt, ...);
+
+// Print using raw syscalls, useful when printing at early init stages.
+void RawPrint(const char *Str);
+
+// Platform specific functions:
+bool IsFile(const std::string &Path);
+bool IsDirectory(const std::string &Path);
+size_t FileSize(const std::string &Path);
+
+void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
+                             Vector<std::string> *V, bool TopDir);
+
+bool MkDirRecursive(const std::string &Dir);
+void RmDirRecursive(const std::string &Dir);
+
+// Iterate files and dirs inside Dir, recursively.
+// Call DirPreCallback/DirPostCallback on dirs before/after
+// calling FileCallback on files.
+void IterateDirRecursive(const std::string &Dir,
+                         void (*DirPreCallback)(const std::string &Dir),
+                         void (*DirPostCallback)(const std::string &Dir),
+                         void (*FileCallback)(const std::string &Dir));
+
+struct SizedFile {
+  std::string File;
+  size_t Size;
+  bool operator<(const SizedFile &B) const { return Size < B.Size; }
+};
+
+void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V);
+
+char GetSeparator();
+bool IsSeparator(char C);
+// Similar to the basename utility: returns the file name w/o the dir prefix.
+std::string Basename(const std::string &Path);
+
+FILE* OpenFile(int Fd, const char *Mode);
+
+int CloseFile(int Fd);
+
+int DuplicateFile(int Fd);
+
+void RemoveFile(const std::string &Path);
+void RenameFile(const std::string &OldPath, const std::string &NewPath);
+
+intptr_t GetHandleFromFd(int fd);
+
+void MkDir(const std::string &Path);
+void RmDir(const std::string &Path);
+
+const std::string &getDevNull();
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_IO_H
diff --git a/custom_mutators/libfuzzer/FuzzerIOPosix.cpp b/custom_mutators/libfuzzer/FuzzerIOPosix.cpp
new file mode 100644
index 00000000..36ec5a9c
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerIOPosix.cpp
@@ -0,0 +1,223 @@
+//===- FuzzerIOPosix.cpp - IO utils for Posix. ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// IO functions implementation using Posix API.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_POSIX || LIBFUZZER_FUCHSIA
+
+  #include "FuzzerExtFunctions.h"
+  #include "FuzzerIO.h"
+  #include <cstdarg>
+  #include <cstdio>
+  #include <dirent.h>
+  #include <fstream>
+  #include <iterator>
+  #include <libgen.h>
+  #include <sys/stat.h>
+  #include <sys/types.h>
+  #include <unistd.h>
+
+namespace fuzzer {
+
+bool IsFile(const std::string &Path) {
+
+  struct stat St;
+  if (stat(Path.c_str(), &St)) return false;
+  return S_ISREG(St.st_mode);
+
+}
+
+bool IsDirectory(const std::string &Path) {
+
+  struct stat St;
+  if (stat(Path.c_str(), &St)) return false;
+  return S_ISDIR(St.st_mode);
+
+}
+
+size_t FileSize(const std::string &Path) {
+
+  struct stat St;
+  if (stat(Path.c_str(), &St)) return 0;
+  return St.st_size;
+
+}
+
+std::string Basename(const std::string &Path) {
+
+  size_t Pos = Path.rfind(GetSeparator());
+  if (Pos == std::string::npos) return Path;
+  assert(Pos < Path.size());
+  return Path.substr(Pos + 1);
+
+}
+
+void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
+                             Vector<std::string> *V, bool TopDir) {
+
+  auto E = GetEpoch(Dir);
+  if (Epoch)
+    if (E && *Epoch >= E) return;
+
+  DIR *D = opendir(Dir.c_str());
+  if (!D) {
+
+    Printf("%s: %s; exiting\n", strerror(errno), Dir.c_str());
+    exit(1);
+
+  }
+
+  while (auto E = readdir(D)) {
+
+    std::string Path = DirPlusFile(Dir, E->d_name);
+    if (E->d_type == DT_REG || E->d_type == DT_LNK ||
+        (E->d_type == DT_UNKNOWN && IsFile(Path)))
+      V->push_back(Path);
+    else if ((E->d_type == DT_DIR ||
+              (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
+             *E->d_name != '.')
+      ListFilesInDirRecursive(Path, Epoch, V, false);
+
+  }
+
+  closedir(D);
+  if (Epoch && TopDir) *Epoch = E;
+
+}
+
+void IterateDirRecursive(const std::string &Dir,
+                         void (*DirPreCallback)(const std::string &Dir),
+                         void (*DirPostCallback)(const std::string &Dir),
+                         void (*FileCallback)(const std::string &Dir)) {
+
+  DirPreCallback(Dir);
+  DIR *D = opendir(Dir.c_str());
+  if (!D) return;
+  while (auto E = readdir(D)) {
+
+    std::string Path = DirPlusFile(Dir, E->d_name);
+    if (E->d_type == DT_REG || E->d_type == DT_LNK ||
+        (E->d_type == DT_UNKNOWN && IsFile(Path)))
+      FileCallback(Path);
+    else if ((E->d_type == DT_DIR ||
+              (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&
+             *E->d_name != '.')
+      IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
+
+  }
+
+  closedir(D);
+  DirPostCallback(Dir);
+
+}
+
+char GetSeparator() {
+
+  return '/';
+
+}
+
+bool IsSeparator(char C) {
+
+  return C == '/';
+
+}
+
+FILE *OpenFile(int Fd, const char *Mode) {
+
+  return fdopen(Fd, Mode);
+
+}
+
+int CloseFile(int fd) {
+
+  return close(fd);
+
+}
+
+int DuplicateFile(int Fd) {
+
+  return dup(Fd);
+
+}
+
+void RemoveFile(const std::string &Path) {
+
+  unlink(Path.c_str());
+
+}
+
+void RenameFile(const std::string &OldPath, const std::string &NewPath) {
+
+  rename(OldPath.c_str(), NewPath.c_str());
+
+}
+
+intptr_t GetHandleFromFd(int fd) {
+
+  return static_cast<intptr_t>(fd);
+
+}
+
+std::string DirName(const std::string &FileName) {
+
+  char *Tmp = new char[FileName.size() + 1];
+  memcpy(Tmp, FileName.c_str(), FileName.size() + 1);
+  std::string Res = dirname(Tmp);
+  delete[] Tmp;
+  return Res;
+
+}
+
+std::string TmpDir() {
+
+  if (auto Env = getenv("TMPDIR")) return Env;
+  return "/tmp";
+
+}
+
+bool IsInterestingCoverageFile(const std::string &FileName) {
+
+  if (FileName.find("compiler-rt/lib/") != std::string::npos)
+    return false;  // sanitizer internal.
+  if (FileName.find("/usr/lib/") != std::string::npos) return false;
+  if (FileName.find("/usr/include/") != std::string::npos) return false;
+  if (FileName == "<null>") return false;
+  return true;
+
+}
+
+void RawPrint(const char *Str) {
+
+  write(2, Str, strlen(Str));
+
+}
+
+void MkDir(const std::string &Path) {
+
+  mkdir(Path.c_str(), 0700);
+
+}
+
+void RmDir(const std::string &Path) {
+
+  rmdir(Path.c_str());
+
+}
+
+const std::string &getDevNull() {
+
+  static const std::string devNull = "/dev/null";
+  return devNull;
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_POSIX
+
diff --git a/custom_mutators/libfuzzer/FuzzerIOWindows.cpp b/custom_mutators/libfuzzer/FuzzerIOWindows.cpp
new file mode 100644
index 00000000..9352984a
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerIOWindows.cpp
@@ -0,0 +1,513 @@
+//===- FuzzerIOWindows.cpp - IO utils for Windows. ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// IO functions implementation for Windows.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_WINDOWS
+
+  #include "FuzzerExtFunctions.h"
+  #include "FuzzerIO.h"
+  #include <cstdarg>
+  #include <cstdio>
+  #include <fstream>
+  #include <io.h>
+  #include <iterator>
+  #include <sys/stat.h>
+  #include <sys/types.h>
+  #include <windows.h>
+
+namespace fuzzer {
+
+static bool IsFile(const std::string &Path, const DWORD &FileAttributes) {
+
+  if (FileAttributes & FILE_ATTRIBUTE_NORMAL) return true;
+
+  if (FileAttributes & FILE_ATTRIBUTE_DIRECTORY) return false;
+
+  HANDLE FileHandle(CreateFileA(Path.c_str(), 0, FILE_SHARE_READ, NULL,
+                                OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
+
+  if (FileHandle == INVALID_HANDLE_VALUE) {
+
+    Printf("CreateFileA() failed for \"%s\" (Error code: %lu).\n", Path.c_str(),
+           GetLastError());
+    return false;
+
+  }
+
+  DWORD FileType = GetFileType(FileHandle);
+
+  if (FileType == FILE_TYPE_UNKNOWN) {
+
+    Printf("GetFileType() failed for \"%s\" (Error code: %lu).\n", Path.c_str(),
+           GetLastError());
+    CloseHandle(FileHandle);
+    return false;
+
+  }
+
+  if (FileType != FILE_TYPE_DISK) {
+
+    CloseHandle(FileHandle);
+    return false;
+
+  }
+
+  CloseHandle(FileHandle);
+  return true;
+
+}
+
+bool IsFile(const std::string &Path) {
+
+  DWORD Att = GetFileAttributesA(Path.c_str());
+
+  if (Att == INVALID_FILE_ATTRIBUTES) {
+
+    Printf("GetFileAttributesA() failed for \"%s\" (Error code: %lu).\n",
+           Path.c_str(), GetLastError());
+    return false;
+
+  }
+
+  return IsFile(Path, Att);
+
+}
+
+static bool IsDir(DWORD FileAttrs) {
+
+  if (FileAttrs == INVALID_FILE_ATTRIBUTES) return false;
+  return FileAttrs & FILE_ATTRIBUTE_DIRECTORY;
+
+}
+
+bool IsDirectory(const std::string &Path) {
+
+  DWORD Att = GetFileAttributesA(Path.c_str());
+
+  if (Att == INVALID_FILE_ATTRIBUTES) {
+
+    Printf("GetFileAttributesA() failed for \"%s\" (Error code: %lu).\n",
+           Path.c_str(), GetLastError());
+    return false;
+
+  }
+
+  return IsDir(Att);
+
+}
+
+std::string Basename(const std::string &Path) {
+
+  size_t Pos = Path.find_last_of("/\\");
+  if (Pos == std::string::npos) return Path;
+  assert(Pos < Path.size());
+  return Path.substr(Pos + 1);
+
+}
+
+size_t FileSize(const std::string &Path) {
+
+  WIN32_FILE_ATTRIBUTE_DATA attr;
+  if (!GetFileAttributesExA(Path.c_str(), GetFileExInfoStandard, &attr)) {
+
+    DWORD LastError = GetLastError();
+    if (LastError != ERROR_FILE_NOT_FOUND)
+      Printf("GetFileAttributesExA() failed for \"%s\" (Error code: %lu).\n",
+             Path.c_str(), LastError);
+    return 0;
+
+  }
+
+  ULARGE_INTEGER size;
+  size.HighPart = attr.nFileSizeHigh;
+  size.LowPart = attr.nFileSizeLow;
+  return size.QuadPart;
+
+}
+
+void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,
+                             Vector<std::string> *V, bool TopDir) {
+
+  auto E = GetEpoch(Dir);
+  if (Epoch)
+    if (E && *Epoch >= E) return;
+
+  std::string Path(Dir);
+  assert(!Path.empty());
+  if (Path.back() != '\\') Path.push_back('\\');
+  Path.push_back('*');
+
+  // Get the first directory entry.
+  WIN32_FIND_DATAA FindInfo;
+  HANDLE           FindHandle(FindFirstFileA(Path.c_str(), &FindInfo));
+  if (FindHandle == INVALID_HANDLE_VALUE) {
+
+    if (GetLastError() == ERROR_FILE_NOT_FOUND) return;
+    Printf("No such file or directory: %s; exiting\n", Dir.c_str());
+    exit(1);
+
+  }
+
+  do {
+
+    std::string FileName = DirPlusFile(Dir, FindInfo.cFileName);
+
+    if (FindInfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+
+      size_t FilenameLen = strlen(FindInfo.cFileName);
+      if ((FilenameLen == 1 && FindInfo.cFileName[0] == '.') ||
+          (FilenameLen == 2 && FindInfo.cFileName[0] == '.' &&
+           FindInfo.cFileName[1] == '.'))
+        continue;
+
+      ListFilesInDirRecursive(FileName, Epoch, V, false);
+
+    } else if (IsFile(FileName, FindInfo.dwFileAttributes))
+
+      V->push_back(FileName);
+
+  } while (FindNextFileA(FindHandle, &FindInfo));
+
+  DWORD LastError = GetLastError();
+  if (LastError != ERROR_NO_MORE_FILES)
+    Printf("FindNextFileA failed (Error code: %lu).\n", LastError);
+
+  FindClose(FindHandle);
+
+  if (Epoch && TopDir) *Epoch = E;
+
+}
+
+void IterateDirRecursive(const std::string &Dir,
+                         void (*DirPreCallback)(const std::string &Dir),
+                         void (*DirPostCallback)(const std::string &Dir),
+                         void (*FileCallback)(const std::string &Dir)) {
+
+  // TODO(metzman): Implement ListFilesInDirRecursive via this function.
+  DirPreCallback(Dir);
+
+  DWORD DirAttrs = GetFileAttributesA(Dir.c_str());
+  if (!IsDir(DirAttrs)) return;
+
+  std::string TargetDir(Dir);
+  assert(!TargetDir.empty());
+  if (TargetDir.back() != '\\') TargetDir.push_back('\\');
+  TargetDir.push_back('*');
+
+  WIN32_FIND_DATAA FindInfo;
+  // Find the directory's first file.
+  HANDLE FindHandle = FindFirstFileA(TargetDir.c_str(), &FindInfo);
+  if (FindHandle == INVALID_HANDLE_VALUE) {
+
+    DWORD LastError = GetLastError();
+    if (LastError != ERROR_FILE_NOT_FOUND) {
+
+      // If the directory isn't empty, then something abnormal is going on.
+      Printf("FindFirstFileA failed for %s (Error code: %lu).\n", Dir.c_str(),
+             LastError);
+
+    }
+
+    return;
+
+  }
+
+  do {
+
+    std::string Path = DirPlusFile(Dir, FindInfo.cFileName);
+    DWORD       PathAttrs = FindInfo.dwFileAttributes;
+    if (IsDir(PathAttrs)) {
+
+      // Is Path the current directory (".") or the parent ("..")?
+      if (strcmp(FindInfo.cFileName, ".") == 0 ||
+          strcmp(FindInfo.cFileName, "..") == 0)
+        continue;
+      IterateDirRecursive(Path, DirPreCallback, DirPostCallback, FileCallback);
+
+    } else if (PathAttrs != INVALID_FILE_ATTRIBUTES) {
+
+      FileCallback(Path);
+
+    }
+
+  } while (FindNextFileA(FindHandle, &FindInfo));
+
+  DWORD LastError = GetLastError();
+  if (LastError != ERROR_NO_MORE_FILES)
+    Printf("FindNextFileA failed for %s (Error code: %lu).\n", Dir.c_str(),
+           LastError);
+
+  FindClose(FindHandle);
+  DirPostCallback(Dir);
+
+}
+
+char GetSeparator() {
+
+  return '\\';
+
+}
+
+FILE *OpenFile(int Fd, const char *Mode) {
+
+  return _fdopen(Fd, Mode);
+
+}
+
+int CloseFile(int Fd) {
+
+  return _close(Fd);
+
+}
+
+int DuplicateFile(int Fd) {
+
+  return _dup(Fd);
+
+}
+
+void RemoveFile(const std::string &Path) {
+
+  _unlink(Path.c_str());
+
+}
+
+void RenameFile(const std::string &OldPath, const std::string &NewPath) {
+
+  rename(OldPath.c_str(), NewPath.c_str());
+
+}
+
+intptr_t GetHandleFromFd(int fd) {
+
+  return _get_osfhandle(fd);
+
+}
+
+bool IsSeparator(char C) {
+
+  return C == '\\' || C == '/';
+
+}
+
+// Parse disk designators, like "C:\". If Relative == true, also accepts: "C:".
+// Returns number of characters considered if successful.
+static size_t ParseDrive(const std::string &FileName, const size_t Offset,
+                         bool Relative = true) {
+
+  if (Offset + 1 >= FileName.size() || FileName[Offset + 1] != ':') return 0;
+  if (Offset + 2 >= FileName.size() || !IsSeparator(FileName[Offset + 2])) {
+
+    if (!Relative)  // Accept relative path?
+      return 0;
+    else
+      return 2;
+
+  }
+
+  return 3;
+
+}
+
+// Parse a file name, like: SomeFile.txt
+// Returns number of characters considered if successful.
+static size_t ParseFileName(const std::string &FileName, const size_t Offset) {
+
+  size_t       Pos = Offset;
+  const size_t End = FileName.size();
+  for (; Pos < End && !IsSeparator(FileName[Pos]); ++Pos)
+    ;
+  return Pos - Offset;
+
+}
+
+// Parse a directory ending in separator, like: `SomeDir\`
+// Returns number of characters considered if successful.
+static size_t ParseDir(const std::string &FileName, const size_t Offset) {
+
+  size_t       Pos = Offset;
+  const size_t End = FileName.size();
+  if (Pos >= End || IsSeparator(FileName[Pos])) return 0;
+  for (; Pos < End && !IsSeparator(FileName[Pos]); ++Pos)
+    ;
+  if (Pos >= End) return 0;
+  ++Pos;  // Include separator.
+  return Pos - Offset;
+
+}
+
+// Parse a servername and share, like: `SomeServer\SomeShare\`
+// Returns number of characters considered if successful.
+static size_t ParseServerAndShare(const std::string &FileName,
+                                  const size_t       Offset) {
+
+  size_t Pos = Offset, Res;
+  if (!(Res = ParseDir(FileName, Pos))) return 0;
+  Pos += Res;
+  if (!(Res = ParseDir(FileName, Pos))) return 0;
+  Pos += Res;
+  return Pos - Offset;
+
+}
+
+// Parse the given Ref string from the position Offset, to exactly match the
+// given string Patt. Returns number of characters considered if successful.
+static size_t ParseCustomString(const std::string &Ref, size_t Offset,
+                                const char *Patt) {
+
+  size_t Len = strlen(Patt);
+  if (Offset + Len > Ref.size()) return 0;
+  return Ref.compare(Offset, Len, Patt) == 0 ? Len : 0;
+
+}
+
+// Parse a location, like:
+// \\?\UNC\Server\Share\  \\?\C:\  \\Server\Share\  \  C:\  C:
+// Returns number of characters considered if successful.
+static size_t ParseLocation(const std::string &FileName) {
+
+  size_t Pos = 0, Res;
+
+  if ((Res = ParseCustomString(FileName, Pos, R"(\\?\)"))) {
+
+    Pos += Res;
+    if ((Res = ParseCustomString(FileName, Pos, R"(UNC\)"))) {
+
+      Pos += Res;
+      if ((Res = ParseServerAndShare(FileName, Pos))) return Pos + Res;
+      return 0;
+
+    }
+
+    if ((Res = ParseDrive(FileName, Pos, false))) return Pos + Res;
+    return 0;
+
+  }
+
+  if (Pos < FileName.size() && IsSeparator(FileName[Pos])) {
+
+    ++Pos;
+    if (Pos < FileName.size() && IsSeparator(FileName[Pos])) {
+
+      ++Pos;
+      if ((Res = ParseServerAndShare(FileName, Pos))) return Pos + Res;
+      return 0;
+
+    }
+
+    return Pos;
+
+  }
+
+  if ((Res = ParseDrive(FileName, Pos))) return Pos + Res;
+
+  return Pos;
+
+}
+
+std::string DirName(const std::string &FileName) {
+
+  size_t LocationLen = ParseLocation(FileName);
+  size_t DirLen = 0, Res;
+  while ((Res = ParseDir(FileName, LocationLen + DirLen)))
+    DirLen += Res;
+  size_t FileLen = ParseFileName(FileName, LocationLen + DirLen);
+
+  if (LocationLen + DirLen + FileLen != FileName.size()) {
+
+    Printf("DirName() failed for \"%s\", invalid path.\n", FileName.c_str());
+    exit(1);
+
+  }
+
+  if (DirLen) {
+
+    --DirLen;        // Remove trailing separator.
+    if (!FileLen) {  // Path ended in separator.
+      assert(DirLen);
+      // Remove file name from Dir.
+      while (DirLen && !IsSeparator(FileName[LocationLen + DirLen - 1]))
+        --DirLen;
+      if (DirLen)  // Remove trailing separator.
+        --DirLen;
+
+    }
+
+  }
+
+  if (!LocationLen) {  // Relative path.
+    if (!DirLen) return ".";
+    return std::string(".\\").append(FileName, 0, DirLen);
+
+  }
+
+  return FileName.substr(0, LocationLen + DirLen);
+
+}
+
+std::string TmpDir() {
+
+  std::string Tmp;
+  Tmp.resize(MAX_PATH + 1);
+  DWORD Size = GetTempPathA(Tmp.size(), &Tmp[0]);
+  if (Size == 0) {
+
+    Printf("Couldn't get Tmp path.\n");
+    exit(1);
+
+  }
+
+  Tmp.resize(Size);
+  return Tmp;
+
+}
+
+bool IsInterestingCoverageFile(const std::string &FileName) {
+
+  if (FileName.find("Program Files") != std::string::npos) return false;
+  if (FileName.find("compiler-rt\\lib\\") != std::string::npos)
+    return false;  // sanitizer internal.
+  if (FileName == "<null>") return false;
+  return true;
+
+}
+
+void RawPrint(const char *Str) {
+
+  _write(2, Str, strlen(Str));
+
+}
+
+void MkDir(const std::string &Path) {
+
+  if (CreateDirectoryA(Path.c_str(), nullptr)) return;
+  Printf("CreateDirectoryA failed for %s (Error code: %lu).\n", Path.c_str(),
+         GetLastError());
+
+}
+
+void RmDir(const std::string &Path) {
+
+  if (RemoveDirectoryA(Path.c_str())) return;
+  Printf("RemoveDirectoryA failed for %s (Error code: %lu).\n", Path.c_str(),
+         GetLastError());
+
+}
+
+const std::string &getDevNull() {
+
+  static const std::string devNull = "NUL";
+  return devNull;
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_WINDOWS
+
diff --git a/custom_mutators/libfuzzer/FuzzerInterface.h b/custom_mutators/libfuzzer/FuzzerInterface.h
new file mode 100644
index 00000000..4f62822e
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerInterface.h
@@ -0,0 +1,79 @@
+//===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Define the interface between libFuzzer and the library being tested.
+//===----------------------------------------------------------------------===//
+
+// NOTE: the libFuzzer interface is thin and in the majority of cases
+// you should not include this file into your target. In 95% of cases
+// all you need is to define the following function in your file:
+// extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+
+// WARNING: keep the interface in C.
+
+#ifndef LLVM_FUZZER_INTERFACE_H
+#define LLVM_FUZZER_INTERFACE_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// Define FUZZER_INTERFACE_VISIBILITY to set default visibility in a way that
+// doesn't break MSVC.
+#if defined(_WIN32)
+#define FUZZER_INTERFACE_VISIBILITY __declspec(dllexport)
+#else
+#define FUZZER_INTERFACE_VISIBILITY __attribute__((visibility("default")))
+#endif
+
+// Mandatory user-provided target function.
+// Executes the code under test with [Data, Data+Size) as the input.
+// libFuzzer will invoke this function *many* times with different inputs.
+// Must return 0.
+FUZZER_INTERFACE_VISIBILITY int
+LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+
+// Optional user-provided initialization function.
+// If provided, this function will be called by libFuzzer once at startup.
+// It may read and modify argc/argv.
+// Must return 0.
+FUZZER_INTERFACE_VISIBILITY int LLVMFuzzerInitialize(int *argc, char ***argv);
+
+// Optional user-provided custom mutator.
+// Mutates raw data in [Data, Data+Size) inplace.
+// Returns the new size, which is not greater than MaxSize.
+// Given the same Seed produces the same mutation.
+FUZZER_INTERFACE_VISIBILITY size_t
+LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize,
+                        unsigned int Seed);
+
+// Optional user-provided custom cross-over function.
+// Combines pieces of Data1 & Data2 together into Out.
+// Returns the new size, which is not greater than MaxOutSize.
+// Should produce the same mutation given the same Seed.
+FUZZER_INTERFACE_VISIBILITY size_t
+LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
+                          const uint8_t *Data2, size_t Size2, uint8_t *Out,
+                          size_t MaxOutSize, unsigned int Seed);
+
+// Experimental, may go away in future.
+// libFuzzer-provided function to be used inside LLVMFuzzerCustomMutator.
+// Mutates raw data in [Data, Data+Size) inplace.
+// Returns the new size, which is not greater than MaxSize.
+FUZZER_INTERFACE_VISIBILITY size_t
+LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+#undef FUZZER_INTERFACE_VISIBILITY
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // LLVM_FUZZER_INTERFACE_H
diff --git a/custom_mutators/libfuzzer/FuzzerInternal.h b/custom_mutators/libfuzzer/FuzzerInternal.h
new file mode 100644
index 00000000..2b172d91
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerInternal.h
@@ -0,0 +1,173 @@
+//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Define the main class fuzzer::Fuzzer and most functions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_INTERNAL_H
+#define LLVM_FUZZER_INTERNAL_H
+
+#include "FuzzerDataFlowTrace.h"
+#include "FuzzerDefs.h"
+#include "FuzzerExtFunctions.h"
+#include "FuzzerInterface.h"
+#include "FuzzerOptions.h"
+#include "FuzzerSHA1.h"
+#include "FuzzerValueBitMap.h"
+#include <algorithm>
+#include <atomic>
+#include <chrono>
+#include <climits>
+#include <cstdlib>
+#include <string.h>
+
+namespace fuzzer {
+
+using namespace std::chrono;
+
+class Fuzzer {
+public:
+
+  Fuzzer(UserCallback CB, InputCorpus &Corpus, MutationDispatcher &MD,
+         FuzzingOptions Options);
+  ~Fuzzer();
+  void Loop(Vector<SizedFile> &CorporaFiles);
+  void ReadAndExecuteSeedCorpora(Vector<SizedFile> &CorporaFiles);
+  void MinimizeCrashLoop(const Unit &U);
+  void RereadOutputCorpus(size_t MaxSize);
+
+  size_t secondsSinceProcessStartUp() {
+    return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
+        .count();
+  }
+
+  bool TimedOut() {
+    return Options.MaxTotalTimeSec > 0 &&
+           secondsSinceProcessStartUp() >
+               static_cast<size_t>(Options.MaxTotalTimeSec);
+  }
+
+  size_t execPerSec() {
+    size_t Seconds = secondsSinceProcessStartUp();
+    return Seconds ? TotalNumberOfRuns / Seconds : 0;
+  }
+
+  size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
+
+  static void StaticAlarmCallback();
+  static void StaticCrashSignalCallback();
+  static void StaticExitCallback();
+  static void StaticInterruptCallback();
+  static void StaticFileSizeExceedCallback();
+  static void StaticGracefulExitCallback();
+
+  void ExecuteCallback(const uint8_t *Data, size_t Size);
+  bool RunOne(const uint8_t *Data, size_t Size, bool MayDeleteFile = false,
+              InputInfo *II = nullptr, bool ForceAddToCorpus = false,
+              bool *FoundUniqFeatures = nullptr);
+
+  // Merge Corpora[1:] into Corpora[0].
+  void Merge(const Vector<std::string> &Corpora);
+  void CrashResistantMergeInternalStep(const std::string &ControlFilePath);
+  MutationDispatcher &GetMD() { return MD; }
+  void PrintFinalStats();
+  void SetMaxInputLen(size_t MaxInputLen);
+  void SetMaxMutationLen(size_t MaxMutationLen);
+  void RssLimitCallback();
+
+  bool InFuzzingThread() const { return IsMyThread; }
+  size_t GetCurrentUnitInFuzzingThead(const uint8_t **Data) const;
+  void TryDetectingAMemoryLeak(const uint8_t *Data, size_t Size,
+                               bool DuringInitialCorpusExecution);
+
+  void HandleMalloc(size_t Size);
+  static void MaybeExitGracefully();
+  std::string WriteToOutputCorpus(const Unit &U);
+
+private:
+  void AlarmCallback();
+  void CrashCallback();
+  void ExitCallback();
+  void CrashOnOverwrittenData();
+  void InterruptCallback();
+  void MutateAndTestOne();
+  void PurgeAllocator();
+  void ReportNewCoverage(InputInfo *II, const Unit &U);
+  void PrintPulseAndReportSlowInput(const uint8_t *Data, size_t Size);
+  void WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix);
+  void PrintStats(const char *Where, const char *End = "\n", size_t Units = 0,
+                  size_t Features = 0);
+  void PrintStatusForNewUnit(const Unit &U, const char *Text);
+  void CheckExitOnSrcPosOrItem();
+
+  static void StaticDeathCallback();
+  void DumpCurrentUnit(const char *Prefix);
+  void DeathCallback();
+
+  void AllocateCurrentUnitData();
+  uint8_t *CurrentUnitData = nullptr;
+  std::atomic<size_t> CurrentUnitSize;
+  uint8_t BaseSha1[kSHA1NumBytes];  // Checksum of the base unit.
+
+  bool GracefulExitRequested = false;
+
+  size_t TotalNumberOfRuns = 0;
+  size_t NumberOfNewUnitsAdded = 0;
+
+  size_t LastCorpusUpdateRun = 0;
+
+  bool HasMoreMallocsThanFrees = false;
+  size_t NumberOfLeakDetectionAttempts = 0;
+
+  system_clock::time_point LastAllocatorPurgeAttemptTime = system_clock::now();
+
+  UserCallback CB;
+  InputCorpus &Corpus;
+  MutationDispatcher &MD;
+  FuzzingOptions Options;
+  DataFlowTrace DFT;
+
+  system_clock::time_point ProcessStartTime = system_clock::now();
+  system_clock::time_point UnitStartTime, UnitStopTime;
+  long TimeOfLongestUnitInSeconds = 0;
+  long EpochOfLastReadOfOutputCorpus = 0;
+
+  size_t MaxInputLen = 0;
+  size_t MaxMutationLen = 0;
+  size_t TmpMaxMutationLen = 0;
+
+  Vector<uint32_t> UniqFeatureSetTmp;
+
+  // Need to know our own thread.
+  static thread_local bool IsMyThread;
+};
+
+struct ScopedEnableMsanInterceptorChecks {
+  ScopedEnableMsanInterceptorChecks() {
+    if (EF->__msan_scoped_enable_interceptor_checks)
+      EF->__msan_scoped_enable_interceptor_checks();
+  }
+  ~ScopedEnableMsanInterceptorChecks() {
+    if (EF->__msan_scoped_disable_interceptor_checks)
+      EF->__msan_scoped_disable_interceptor_checks();
+  }
+};
+
+struct ScopedDisableMsanInterceptorChecks {
+  ScopedDisableMsanInterceptorChecks() {
+    if (EF->__msan_scoped_disable_interceptor_checks)
+      EF->__msan_scoped_disable_interceptor_checks();
+  }
+  ~ScopedDisableMsanInterceptorChecks() {
+    if (EF->__msan_scoped_enable_interceptor_checks)
+      EF->__msan_scoped_enable_interceptor_checks();
+  }
+};
+
+} // namespace fuzzer
+
+#endif // LLVM_FUZZER_INTERNAL_H
diff --git a/custom_mutators/libfuzzer/FuzzerLoop.cpp b/custom_mutators/libfuzzer/FuzzerLoop.cpp
new file mode 100644
index 00000000..49187b30
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerLoop.cpp
@@ -0,0 +1,1087 @@
+//===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Fuzzer's main loop.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerCorpus.h"
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include "FuzzerMutate.h"
+#include "FuzzerPlatform.h"
+#include "FuzzerRandom.h"
+#include "FuzzerTracePC.h"
+#include <algorithm>
+#include <cstring>
+#include <memory>
+#include <mutex>
+#include <set>
+
+#if defined(__has_include)
+  #if __has_include(<sanitizer / lsan_interface.h>)
+    #include <sanitizer/lsan_interface.h>
+  #endif
+#endif
+
+#define NO_SANITIZE_MEMORY
+#if defined(__has_feature)
+  #if __has_feature(memory_sanitizer)
+    #undef NO_SANITIZE_MEMORY
+    #define NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+  #endif
+#endif
+
+namespace fuzzer {
+
+static const size_t kMaxUnitSizeToPrint = 256;
+
+thread_local bool Fuzzer::IsMyThread;
+
+bool RunningUserCallback = false;
+
+// Only one Fuzzer per process.
+static Fuzzer *F;
+
+// Leak detection is expensive, so we first check if there were more mallocs
+// than frees (using the sanitizer malloc hooks) and only then try to call lsan.
+struct MallocFreeTracer {
+
+  void Start(int TraceLevel) {
+
+    this->TraceLevel = TraceLevel;
+    if (TraceLevel) Printf("MallocFreeTracer: START\n");
+    Mallocs = 0;
+    Frees = 0;
+
+  }
+
+  // Returns true if there were more mallocs than frees.
+  bool Stop() {
+
+    if (TraceLevel)
+      Printf("MallocFreeTracer: STOP %zd %zd (%s)\n", Mallocs.load(),
+             Frees.load(), Mallocs == Frees ? "same" : "DIFFERENT");
+    bool Result = Mallocs > Frees;
+    Mallocs = 0;
+    Frees = 0;
+    TraceLevel = 0;
+    return Result;
+
+  }
+
+  std::atomic<size_t> Mallocs;
+  std::atomic<size_t> Frees;
+  int                 TraceLevel = 0;
+
+  std::recursive_mutex TraceMutex;
+  bool                 TraceDisabled = false;
+
+};
+
+static MallocFreeTracer AllocTracer;
+
+// Locks printing and avoids nested hooks triggered from mallocs/frees in
+// sanitizer.
+class TraceLock {
+
+ public:
+  TraceLock() : Lock(AllocTracer.TraceMutex) {
+
+    AllocTracer.TraceDisabled = !AllocTracer.TraceDisabled;
+
+  }
+
+  ~TraceLock() {
+
+    AllocTracer.TraceDisabled = !AllocTracer.TraceDisabled;
+
+  }
+
+  bool IsDisabled() const {
+
+    // This is already inverted value.
+    return !AllocTracer.TraceDisabled;
+
+  }
+
+ private:
+  std::lock_guard<std::recursive_mutex> Lock;
+
+};
+
+ATTRIBUTE_NO_SANITIZE_MEMORY
+void MallocHook(const volatile void *ptr, size_t size) {
+
+  size_t N = AllocTracer.Mallocs++;
+  F->HandleMalloc(size);
+  if (int TraceLevel = AllocTracer.TraceLevel) {
+
+    TraceLock Lock;
+    if (Lock.IsDisabled()) return;
+    Printf("MALLOC[%zd] %p %zd\n", N, ptr, size);
+    if (TraceLevel >= 2 && EF) PrintStackTrace();
+
+  }
+
+}
+
+ATTRIBUTE_NO_SANITIZE_MEMORY
+void FreeHook(const volatile void *ptr) {
+
+  size_t N = AllocTracer.Frees++;
+  if (int TraceLevel = AllocTracer.TraceLevel) {
+
+    TraceLock Lock;
+    if (Lock.IsDisabled()) return;
+    Printf("FREE[%zd]   %p\n", N, ptr);
+    if (TraceLevel >= 2 && EF) PrintStackTrace();
+
+  }
+
+}
+
+// Crash on a single malloc that exceeds the rss limit.
+void Fuzzer::HandleMalloc(size_t Size) {
+
+  if (!Options.MallocLimitMb || (Size >> 20) < (size_t)Options.MallocLimitMb)
+    return;
+  Printf("==%d== ERROR: libFuzzer: out-of-memory (malloc(%zd))\n", GetPid(),
+         Size);
+  Printf("   To change the out-of-memory limit use -rss_limit_mb=<N>\n\n");
+  PrintStackTrace();
+  DumpCurrentUnit("oom-");
+  Printf("SUMMARY: libFuzzer: out-of-memory\n");
+  PrintFinalStats();
+  _Exit(Options.OOMExitCode);  // Stop right now.
+
+}
+
+Fuzzer::Fuzzer(UserCallback CB, InputCorpus &Corpus, MutationDispatcher &MD,
+               FuzzingOptions Options)
+    : CB(CB), Corpus(Corpus), MD(MD), Options(Options) {
+
+  if (EF->__sanitizer_set_death_callback)
+    EF->__sanitizer_set_death_callback(StaticDeathCallback);
+  assert(!F);
+  F = this;
+  TPC.ResetMaps();
+  IsMyThread = true;
+  if (Options.DetectLeaks && EF->__sanitizer_install_malloc_and_free_hooks)
+    EF->__sanitizer_install_malloc_and_free_hooks(MallocHook, FreeHook);
+  TPC.SetUseCounters(Options.UseCounters);
+  TPC.SetUseValueProfileMask(Options.UseValueProfile);
+
+  if (Options.Verbosity) TPC.PrintModuleInfo();
+  if (!Options.OutputCorpus.empty() && Options.ReloadIntervalSec)
+    EpochOfLastReadOfOutputCorpus = GetEpoch(Options.OutputCorpus);
+  MaxInputLen = MaxMutationLen = Options.MaxLen;
+  TmpMaxMutationLen = 0;  // Will be set once we load the corpus.
+  AllocateCurrentUnitData();
+  CurrentUnitSize = 0;
+  memset(BaseSha1, 0, sizeof(BaseSha1));
+
+}
+
+Fuzzer::~Fuzzer() {
+
+}
+
+void Fuzzer::AllocateCurrentUnitData() {
+
+  if (CurrentUnitData || MaxInputLen == 0) return;
+  CurrentUnitData = new uint8_t[MaxInputLen];
+
+}
+
+void Fuzzer::StaticDeathCallback() {
+
+  assert(F);
+  F->DeathCallback();
+
+}
+
+void Fuzzer::DumpCurrentUnit(const char *Prefix) {
+
+  if (!CurrentUnitData) return;  // Happens when running individual inputs.
+  ScopedDisableMsanInterceptorChecks S;
+  MD.PrintMutationSequence();
+  Printf("; base unit: %s\n", Sha1ToString(BaseSha1).c_str());
+  size_t UnitSize = CurrentUnitSize;
+  if (UnitSize <= kMaxUnitSizeToPrint) {
+
+    PrintHexArray(CurrentUnitData, UnitSize, "\n");
+    PrintASCII(CurrentUnitData, UnitSize, "\n");
+
+  }
+
+  WriteUnitToFileWithPrefix({CurrentUnitData, CurrentUnitData + UnitSize},
+                            Prefix);
+
+}
+
+NO_SANITIZE_MEMORY
+void Fuzzer::DeathCallback() {
+
+  DumpCurrentUnit("crash-");
+  PrintFinalStats();
+
+}
+
+void Fuzzer::StaticAlarmCallback() {
+
+  assert(F);
+  F->AlarmCallback();
+
+}
+
+void Fuzzer::StaticCrashSignalCallback() {
+
+  assert(F);
+  F->CrashCallback();
+
+}
+
+void Fuzzer::StaticExitCallback() {
+
+  assert(F);
+  F->ExitCallback();
+
+}
+
+void Fuzzer::StaticInterruptCallback() {
+
+  assert(F);
+  F->InterruptCallback();
+
+}
+
+void Fuzzer::StaticGracefulExitCallback() {
+
+  assert(F);
+  F->GracefulExitRequested = true;
+  Printf("INFO: signal received, trying to exit gracefully\n");
+
+}
+
+void Fuzzer::StaticFileSizeExceedCallback() {
+
+  Printf("==%lu== ERROR: libFuzzer: file size exceeded\n", GetPid());
+  exit(1);
+
+}
+
+void Fuzzer::CrashCallback() {
+
+  if (EF->__sanitizer_acquire_crash_state &&
+      !EF->__sanitizer_acquire_crash_state())
+    return;
+  Printf("==%lu== ERROR: libFuzzer: deadly signal\n", GetPid());
+  PrintStackTrace();
+  Printf(
+      "NOTE: libFuzzer has rudimentary signal handlers.\n"
+      "      Combine libFuzzer with AddressSanitizer or similar for better "
+      "crash reports.\n");
+  Printf("SUMMARY: libFuzzer: deadly signal\n");
+  DumpCurrentUnit("crash-");
+  PrintFinalStats();
+  _Exit(Options.ErrorExitCode);  // Stop right now.
+
+}
+
+void Fuzzer::ExitCallback() {
+
+  if (!RunningUserCallback)
+    return;  // This exit did not come from the user callback
+  if (EF->__sanitizer_acquire_crash_state &&
+      !EF->__sanitizer_acquire_crash_state())
+    return;
+  Printf("==%lu== ERROR: libFuzzer: fuzz target exited\n", GetPid());
+  PrintStackTrace();
+  Printf("SUMMARY: libFuzzer: fuzz target exited\n");
+  DumpCurrentUnit("crash-");
+  PrintFinalStats();
+  _Exit(Options.ErrorExitCode);
+
+}
+
+void Fuzzer::MaybeExitGracefully() {
+
+  if (!F->GracefulExitRequested) return;
+  Printf("==%lu== INFO: libFuzzer: exiting as requested\n", GetPid());
+  RmDirRecursive(TempPath("FuzzWithFork", ".dir"));
+  F->PrintFinalStats();
+  _Exit(0);
+
+}
+
+void Fuzzer::InterruptCallback() {
+
+  Printf("==%lu== libFuzzer: run interrupted; exiting\n", GetPid());
+  PrintFinalStats();
+  ScopedDisableMsanInterceptorChecks S;  // RmDirRecursive may call opendir().
+  RmDirRecursive(TempPath("FuzzWithFork", ".dir"));
+  // Stop right now, don't perform any at-exit actions.
+  _Exit(Options.InterruptExitCode);
+
+}
+
+NO_SANITIZE_MEMORY
+void Fuzzer::AlarmCallback() {
+
+  assert(Options.UnitTimeoutSec > 0);
+  // In Windows and Fuchsia, Alarm callback is executed by a different thread.
+  // NetBSD's current behavior needs this change too.
+#if !LIBFUZZER_WINDOWS && !LIBFUZZER_NETBSD && !LIBFUZZER_FUCHSIA
+  if (!InFuzzingThread()) return;
+#endif
+  if (!RunningUserCallback) return;  // We have not started running units yet.
+  size_t Seconds =
+      duration_cast<seconds>(system_clock::now() - UnitStartTime).count();
+  if (Seconds == 0) return;
+  if (Options.Verbosity >= 2) Printf("AlarmCallback %zd\n", Seconds);
+  if (Seconds >= (size_t)Options.UnitTimeoutSec) {
+
+    if (EF->__sanitizer_acquire_crash_state &&
+        !EF->__sanitizer_acquire_crash_state())
+      return;
+    Printf("ALARM: working on the last Unit for %zd seconds\n", Seconds);
+    Printf("       and the timeout value is %d (use -timeout=N to change)\n",
+           Options.UnitTimeoutSec);
+    DumpCurrentUnit("timeout-");
+    Printf("==%lu== ERROR: libFuzzer: timeout after %d seconds\n", GetPid(),
+           Seconds);
+    PrintStackTrace();
+    Printf("SUMMARY: libFuzzer: timeout\n");
+    PrintFinalStats();
+    _Exit(Options.TimeoutExitCode);  // Stop right now.
+
+  }
+
+}
+
+void Fuzzer::RssLimitCallback() {
+
+  if (EF->__sanitizer_acquire_crash_state &&
+      !EF->__sanitizer_acquire_crash_state())
+    return;
+  Printf(
+      "==%lu== ERROR: libFuzzer: out-of-memory (used: %zdMb; limit: %zdMb)\n",
+      GetPid(), GetPeakRSSMb(), Options.RssLimitMb);
+  Printf("   To change the out-of-memory limit use -rss_limit_mb=<N>\n\n");
+  PrintMemoryProfile();
+  DumpCurrentUnit("oom-");
+  Printf("SUMMARY: libFuzzer: out-of-memory\n");
+  PrintFinalStats();
+  _Exit(Options.OOMExitCode);  // Stop right now.
+
+}
+
+void Fuzzer::PrintStats(const char *Where, const char *End, size_t Units,
+                        size_t Features) {
+
+  size_t ExecPerSec = execPerSec();
+  if (!Options.Verbosity) return;
+  Printf("#%zd\t%s", TotalNumberOfRuns, Where);
+  if (size_t N = TPC.GetTotalPCCoverage()) Printf(" cov: %zd", N);
+  if (size_t N = Features ? Features : Corpus.NumFeatures())
+    Printf(" ft: %zd", N);
+  if (!Corpus.empty()) {
+
+    Printf(" corp: %zd", Corpus.NumActiveUnits());
+    if (size_t N = Corpus.SizeInBytes()) {
+
+      if (N < (1 << 14))
+        Printf("/%zdb", N);
+      else if (N < (1 << 24))
+        Printf("/%zdKb", N >> 10);
+      else
+        Printf("/%zdMb", N >> 20);
+
+    }
+
+    if (size_t FF = Corpus.NumInputsThatTouchFocusFunction())
+      Printf(" focus: %zd", FF);
+
+  }
+
+  if (TmpMaxMutationLen) Printf(" lim: %zd", TmpMaxMutationLen);
+  if (Units) Printf(" units: %zd", Units);
+
+  Printf(" exec/s: %zd", ExecPerSec);
+  Printf(" rss: %zdMb", GetPeakRSSMb());
+  Printf("%s", End);
+
+}
+
+void Fuzzer::PrintFinalStats() {
+
+  if (Options.PrintCoverage) TPC.PrintCoverage();
+  if (Options.PrintCorpusStats) Corpus.PrintStats();
+  if (!Options.PrintFinalStats) return;
+  size_t ExecPerSec = execPerSec();
+  Printf("stat::number_of_executed_units: %zd\n", TotalNumberOfRuns);
+  Printf("stat::average_exec_per_sec:     %zd\n", ExecPerSec);
+  Printf("stat::new_units_added:          %zd\n", NumberOfNewUnitsAdded);
+  Printf("stat::slowest_unit_time_sec:    %zd\n", TimeOfLongestUnitInSeconds);
+  Printf("stat::peak_rss_mb:              %zd\n", GetPeakRSSMb());
+
+}
+
+void Fuzzer::SetMaxInputLen(size_t MaxInputLen) {
+
+  assert(this->MaxInputLen ==
+         0);  // Can only reset MaxInputLen from 0 to non-0.
+  assert(MaxInputLen);
+  this->MaxInputLen = MaxInputLen;
+  this->MaxMutationLen = MaxInputLen;
+  AllocateCurrentUnitData();
+  Printf(
+      "INFO: -max_len is not provided; "
+      "libFuzzer will not generate inputs larger than %zd bytes\n",
+      MaxInputLen);
+
+}
+
+void Fuzzer::SetMaxMutationLen(size_t MaxMutationLen) {
+
+  assert(MaxMutationLen && MaxMutationLen <= MaxInputLen);
+  this->MaxMutationLen = MaxMutationLen;
+
+}
+
+void Fuzzer::CheckExitOnSrcPosOrItem() {
+
+  if (!Options.ExitOnSrcPos.empty()) {
+
+    static auto *PCsSet = new Set<uintptr_t>;
+    auto         HandlePC = [&](const TracePC::PCTableEntry *TE) {
+
+      if (!PCsSet->insert(TE->PC).second) return;
+      std::string Descr = DescribePC("%F %L", TE->PC + 1);
+      if (Descr.find(Options.ExitOnSrcPos) != std::string::npos) {
+
+        Printf("INFO: found line matching '%s', exiting.\n",
+               Options.ExitOnSrcPos.c_str());
+        _Exit(0);
+
+      }
+
+    };
+
+    TPC.ForEachObservedPC(HandlePC);
+
+  }
+
+  if (!Options.ExitOnItem.empty()) {
+
+    if (Corpus.HasUnit(Options.ExitOnItem)) {
+
+      Printf("INFO: found item with checksum '%s', exiting.\n",
+             Options.ExitOnItem.c_str());
+      _Exit(0);
+
+    }
+
+  }
+
+}
+
+void Fuzzer::RereadOutputCorpus(size_t MaxSize) {
+
+  if (Options.OutputCorpus.empty() || !Options.ReloadIntervalSec) return;
+  Vector<Unit> AdditionalCorpus;
+  ReadDirToVectorOfUnits(Options.OutputCorpus.c_str(), &AdditionalCorpus,
+                         &EpochOfLastReadOfOutputCorpus, MaxSize,
+                         /*ExitOnError*/ false);
+  if (Options.Verbosity >= 2)
+    Printf("Reload: read %zd new units.\n", AdditionalCorpus.size());
+  bool Reloaded = false;
+  for (auto &U : AdditionalCorpus) {
+
+    if (U.size() > MaxSize) U.resize(MaxSize);
+    if (!Corpus.HasUnit(U)) {
+
+      if (RunOne(U.data(), U.size())) {
+
+        CheckExitOnSrcPosOrItem();
+        Reloaded = true;
+
+      }
+
+    }
+
+  }
+
+  if (Reloaded) PrintStats("RELOAD");
+
+}
+
+void Fuzzer::PrintPulseAndReportSlowInput(const uint8_t *Data, size_t Size) {
+
+  auto TimeOfUnit =
+      duration_cast<seconds>(UnitStopTime - UnitStartTime).count();
+  if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) &&
+      secondsSinceProcessStartUp() >= 2)
+    PrintStats("pulse ");
+  if (TimeOfUnit > TimeOfLongestUnitInSeconds * 1.1 &&
+      TimeOfUnit >= Options.ReportSlowUnits) {
+
+    TimeOfLongestUnitInSeconds = TimeOfUnit;
+    Printf("Slowest unit: %zd s:\n", TimeOfLongestUnitInSeconds);
+    WriteUnitToFileWithPrefix({Data, Data + Size}, "slow-unit-");
+
+  }
+
+}
+
+static void WriteFeatureSetToFile(const std::string &     FeaturesDir,
+                                  const std::string &     FileName,
+                                  const Vector<uint32_t> &FeatureSet) {
+
+  if (FeaturesDir.empty() || FeatureSet.empty()) return;
+  WriteToFile(reinterpret_cast<const uint8_t *>(FeatureSet.data()),
+              FeatureSet.size() * sizeof(FeatureSet[0]),
+              DirPlusFile(FeaturesDir, FileName));
+
+}
+
+static void RenameFeatureSetFile(const std::string &FeaturesDir,
+                                 const std::string &OldFile,
+                                 const std::string &NewFile) {
+
+  if (FeaturesDir.empty()) return;
+  RenameFile(DirPlusFile(FeaturesDir, OldFile),
+             DirPlusFile(FeaturesDir, NewFile));
+
+}
+
+static void WriteEdgeToMutationGraphFile(const std::string &MutationGraphFile,
+                                         const InputInfo *  II,
+                                         const InputInfo *  BaseII,
+                                         const std::string &MS) {
+
+  if (MutationGraphFile.empty()) return;
+
+  std::string Sha1 = Sha1ToString(II->Sha1);
+
+  std::string OutputString;
+
+  // Add a new vertex.
+  OutputString.append("\"");
+  OutputString.append(Sha1);
+  OutputString.append("\"\n");
+
+  // Add a new edge if there is base input.
+  if (BaseII) {
+
+    std::string BaseSha1 = Sha1ToString(BaseII->Sha1);
+    OutputString.append("\"");
+    OutputString.append(BaseSha1);
+    OutputString.append("\" -> \"");
+    OutputString.append(Sha1);
+    OutputString.append("\" [label=\"");
+    OutputString.append(MS);
+    OutputString.append("\"];\n");
+
+  }
+
+  AppendToFile(OutputString, MutationGraphFile);
+
+}
+
+bool Fuzzer::RunOne(const uint8_t *Data, size_t Size, bool MayDeleteFile,
+                    InputInfo *II, bool ForceAddToCorpus,
+                    bool *FoundUniqFeatures) {
+
+  if (!Size) return false;
+
+  ExecuteCallback(Data, Size);
+  auto TimeOfUnit = duration_cast<microseconds>(UnitStopTime - UnitStartTime);
+
+  UniqFeatureSetTmp.clear();
+  size_t FoundUniqFeaturesOfII = 0;
+  size_t NumUpdatesBefore = Corpus.NumFeatureUpdates();
+  TPC.CollectFeatures([&](size_t Feature) {
+
+    if (Corpus.AddFeature(Feature, Size, Options.Shrink))
+      UniqFeatureSetTmp.push_back(Feature);
+    if (Options.Entropic) Corpus.UpdateFeatureFrequency(II, Feature);
+    if (Options.ReduceInputs && II && !II->NeverReduce)
+      if (std::binary_search(II->UniqFeatureSet.begin(),
+                             II->UniqFeatureSet.end(), Feature))
+        FoundUniqFeaturesOfII++;
+
+  });
+
+  if (FoundUniqFeatures) *FoundUniqFeatures = FoundUniqFeaturesOfII;
+  PrintPulseAndReportSlowInput(Data, Size);
+  size_t NumNewFeatures = Corpus.NumFeatureUpdates() - NumUpdatesBefore;
+  if (NumNewFeatures || ForceAddToCorpus) {
+
+    TPC.UpdateObservedPCs();
+    auto NewII =
+        Corpus.AddToCorpus({Data, Data + Size}, NumNewFeatures, MayDeleteFile,
+                           TPC.ObservedFocusFunction(), ForceAddToCorpus,
+                           TimeOfUnit, UniqFeatureSetTmp, DFT, II);
+    WriteFeatureSetToFile(Options.FeaturesDir, Sha1ToString(NewII->Sha1),
+                          NewII->UniqFeatureSet);
+    WriteEdgeToMutationGraphFile(Options.MutationGraphFile, NewII, II,
+                                 MD.MutationSequence());
+    return true;
+
+  }
+
+  if (II && FoundUniqFeaturesOfII &&
+      II->DataFlowTraceForFocusFunction.empty() &&
+      FoundUniqFeaturesOfII == II->UniqFeatureSet.size() &&
+      II->U.size() > Size) {
+
+    auto OldFeaturesFile = Sha1ToString(II->Sha1);
+    Corpus.Replace(II, {Data, Data + Size});
+    RenameFeatureSetFile(Options.FeaturesDir, OldFeaturesFile,
+                         Sha1ToString(II->Sha1));
+    return true;
+
+  }
+
+  return false;
+
+}
+
+size_t Fuzzer::GetCurrentUnitInFuzzingThead(const uint8_t **Data) const {
+
+  assert(InFuzzingThread());
+  *Data = CurrentUnitData;
+  return CurrentUnitSize;
+
+}
+
+void Fuzzer::CrashOnOverwrittenData() {
+
+  Printf("==%d== ERROR: libFuzzer: fuzz target overwrites its const input\n",
+         GetPid());
+  PrintStackTrace();
+  Printf("SUMMARY: libFuzzer: overwrites-const-input\n");
+  DumpCurrentUnit("crash-");
+  PrintFinalStats();
+  _Exit(Options.ErrorExitCode);  // Stop right now.
+
+}
+
+// Compare two arrays, but not all bytes if the arrays are large.
+static bool LooseMemeq(const uint8_t *A, const uint8_t *B, size_t Size) {
+
+  const size_t Limit = 64;
+  if (Size <= 64) return !memcmp(A, B, Size);
+  // Compare first and last Limit/2 bytes.
+  return !memcmp(A, B, Limit / 2) &&
+         !memcmp(A + Size - Limit / 2, B + Size - Limit / 2, Limit / 2);
+
+}
+
+void Fuzzer::ExecuteCallback(const uint8_t *Data, size_t Size) {
+
+  TPC.RecordInitialStack();
+  TotalNumberOfRuns++;
+  assert(InFuzzingThread());
+  // We copy the contents of Unit into a separate heap buffer
+  // so that we reliably find buffer overflows in it.
+  uint8_t *DataCopy = new uint8_t[Size];
+  memcpy(DataCopy, Data, Size);
+  if (EF->__msan_unpoison) EF->__msan_unpoison(DataCopy, Size);
+  if (EF->__msan_unpoison_param) EF->__msan_unpoison_param(2);
+  if (CurrentUnitData && CurrentUnitData != Data)
+    memcpy(CurrentUnitData, Data, Size);
+  CurrentUnitSize = Size;
+  {
+
+    ScopedEnableMsanInterceptorChecks S;
+    AllocTracer.Start(Options.TraceMalloc);
+    UnitStartTime = system_clock::now();
+    TPC.ResetMaps();
+    RunningUserCallback = true;
+    int Res = CB(DataCopy, Size);
+    RunningUserCallback = false;
+    UnitStopTime = system_clock::now();
+    (void)Res;
+    assert(Res == 0);
+    HasMoreMallocsThanFrees = AllocTracer.Stop();
+
+  }
+
+  if (!LooseMemeq(DataCopy, Data, Size)) CrashOnOverwrittenData();
+  CurrentUnitSize = 0;
+  delete[] DataCopy;
+
+}
+
+std::string Fuzzer::WriteToOutputCorpus(const Unit &U) {
+
+  if (Options.OnlyASCII) assert(IsASCII(U));
+  if (Options.OutputCorpus.empty()) return "";
+  std::string Path = DirPlusFile(Options.OutputCorpus, Hash(U));
+  WriteToFile(U, Path);
+  if (Options.Verbosity >= 2)
+    Printf("Written %zd bytes to %s\n", U.size(), Path.c_str());
+  return Path;
+
+}
+
+void Fuzzer::WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix) {
+
+  if (!Options.SaveArtifacts) return;
+  std::string Path = Options.ArtifactPrefix + Prefix + Hash(U);
+  if (!Options.ExactArtifactPath.empty())
+    Path = Options.ExactArtifactPath;  // Overrides ArtifactPrefix.
+  WriteToFile(U, Path);
+  Printf("artifact_prefix='%s'; Test unit written to %s\n",
+         Options.ArtifactPrefix.c_str(), Path.c_str());
+  if (U.size() <= kMaxUnitSizeToPrint)
+    Printf("Base64: %s\n", Base64(U).c_str());
+
+}
+
+void Fuzzer::PrintStatusForNewUnit(const Unit &U, const char *Text) {
+
+  if (!Options.PrintNEW) return;
+  PrintStats(Text, "");
+  if (Options.Verbosity) {
+
+    Printf(" L: %zd/%zd ", U.size(), Corpus.MaxInputSize());
+    MD.PrintMutationSequence();
+    Printf("\n");
+
+  }
+
+}
+
+void Fuzzer::ReportNewCoverage(InputInfo *II, const Unit &U) {
+
+  II->NumSuccessfullMutations++;
+  MD.RecordSuccessfulMutationSequence();
+  PrintStatusForNewUnit(U, II->Reduced ? "REDUCE" : "NEW   ");
+  WriteToOutputCorpus(U);
+  NumberOfNewUnitsAdded++;
+  CheckExitOnSrcPosOrItem();  // Check only after the unit is saved to corpus.
+  LastCorpusUpdateRun = TotalNumberOfRuns;
+
+}
+
+// Tries detecting a memory leak on the particular input that we have just
+// executed before calling this function.
+void Fuzzer::TryDetectingAMemoryLeak(const uint8_t *Data, size_t Size,
+                                     bool DuringInitialCorpusExecution) {
+
+  if (!HasMoreMallocsThanFrees) return;  // mallocs==frees, a leak is unlikely.
+  if (!Options.DetectLeaks) return;
+  if (!DuringInitialCorpusExecution &&
+      TotalNumberOfRuns >= Options.MaxNumberOfRuns)
+    return;
+  if (!&(EF->__lsan_enable) || !&(EF->__lsan_disable) ||
+      !(EF->__lsan_do_recoverable_leak_check))
+    return;  // No lsan.
+  // Run the target once again, but with lsan disabled so that if there is
+  // a real leak we do not report it twice.
+  EF->__lsan_disable();
+  ExecuteCallback(Data, Size);
+  EF->__lsan_enable();
+  if (!HasMoreMallocsThanFrees) return;  // a leak is unlikely.
+  if (NumberOfLeakDetectionAttempts++ > 1000) {
+
+    Options.DetectLeaks = false;
+    Printf(
+        "INFO: libFuzzer disabled leak detection after every mutation.\n"
+        "      Most likely the target function accumulates allocated\n"
+        "      memory in a global state w/o actually leaking it.\n"
+        "      You may try running this binary with -trace_malloc=[12]"
+        "      to get a trace of mallocs and frees.\n"
+        "      If LeakSanitizer is enabled in this process it will still\n"
+        "      run on the process shutdown.\n");
+    return;
+
+  }
+
+  // Now perform the actual lsan pass. This is expensive and we must ensure
+  // we don't call it too often.
+  if (EF->__lsan_do_recoverable_leak_check()) {  // Leak is found, report it.
+    if (DuringInitialCorpusExecution)
+      Printf("\nINFO: a leak has been found in the initial corpus.\n\n");
+    Printf("INFO: to ignore leaks on libFuzzer side use -detect_leaks=0.\n\n");
+    CurrentUnitSize = Size;
+    DumpCurrentUnit("leak-");
+    PrintFinalStats();
+    _Exit(Options.ErrorExitCode);  // not exit() to disable lsan further on.
+
+  }
+
+}
+
+void Fuzzer::MutateAndTestOne() {
+
+  MD.StartMutationSequence();
+
+  auto &II = Corpus.ChooseUnitToMutate(MD.GetRand());
+  if (Options.DoCrossOver) {
+
+    auto &CrossOverII = Corpus.ChooseUnitToCrossOverWith(
+        MD.GetRand(), Options.CrossOverUniformDist);
+    MD.SetCrossOverWith(&CrossOverII.U);
+
+  }
+
+  const auto &U = II.U;
+  memcpy(BaseSha1, II.Sha1, sizeof(BaseSha1));
+  assert(CurrentUnitData);
+  size_t Size = U.size();
+  assert(Size <= MaxInputLen && "Oversized Unit");
+  memcpy(CurrentUnitData, U.data(), Size);
+
+  assert(MaxMutationLen > 0);
+
+  size_t CurrentMaxMutationLen =
+      Min(MaxMutationLen, Max(U.size(), TmpMaxMutationLen));
+  assert(CurrentMaxMutationLen > 0);
+
+  for (int i = 0; i < Options.MutateDepth; i++) {
+
+    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns) break;
+    MaybeExitGracefully();
+    size_t NewSize = 0;
+    if (II.HasFocusFunction && !II.DataFlowTraceForFocusFunction.empty() &&
+        Size <= CurrentMaxMutationLen)
+      NewSize = MD.MutateWithMask(CurrentUnitData, Size, Size,
+                                  II.DataFlowTraceForFocusFunction);
+
+    // If MutateWithMask either failed or wasn't called, call default Mutate.
+    if (!NewSize)
+      NewSize = MD.Mutate(CurrentUnitData, Size, CurrentMaxMutationLen);
+    assert(NewSize > 0 && "Mutator returned empty unit");
+    assert(NewSize <= CurrentMaxMutationLen && "Mutator return oversized unit");
+    Size = NewSize;
+    II.NumExecutedMutations++;
+    Corpus.IncrementNumExecutedMutations();
+
+    bool FoundUniqFeatures = false;
+    bool NewCov = RunOne(CurrentUnitData, Size, /*MayDeleteFile=*/true, &II,
+                         /*ForceAddToCorpus*/ false, &FoundUniqFeatures);
+    TryDetectingAMemoryLeak(CurrentUnitData, Size,
+                            /*DuringInitialCorpusExecution*/ false);
+    if (NewCov) {
+
+      ReportNewCoverage(&II, {CurrentUnitData, CurrentUnitData + Size});
+      break;  // We will mutate this input more in the next rounds.
+
+    }
+
+    if (Options.ReduceDepth && !FoundUniqFeatures) break;
+
+  }
+
+  II.NeedsEnergyUpdate = true;
+
+}
+
+void Fuzzer::PurgeAllocator() {
+
+  if (Options.PurgeAllocatorIntervalSec < 0 || !EF->__sanitizer_purge_allocator)
+    return;
+  if (duration_cast<seconds>(system_clock::now() -
+                             LastAllocatorPurgeAttemptTime)
+          .count() < Options.PurgeAllocatorIntervalSec)
+    return;
+
+  if (Options.RssLimitMb <= 0 ||
+      GetPeakRSSMb() > static_cast<size_t>(Options.RssLimitMb) / 2)
+    EF->__sanitizer_purge_allocator();
+
+  LastAllocatorPurgeAttemptTime = system_clock::now();
+
+}
+
+void Fuzzer::ReadAndExecuteSeedCorpora(Vector<SizedFile> &CorporaFiles) {
+
+  const size_t kMaxSaneLen = 1 << 20;
+  const size_t kMinDefaultLen = 4096;
+  size_t       MaxSize = 0;
+  size_t       MinSize = -1;
+  size_t       TotalSize = 0;
+  for (auto &File : CorporaFiles) {
+
+    MaxSize = Max(File.Size, MaxSize);
+    MinSize = Min(File.Size, MinSize);
+    TotalSize += File.Size;
+
+  }
+
+  if (Options.MaxLen == 0)
+    SetMaxInputLen(std::min(std::max(kMinDefaultLen, MaxSize), kMaxSaneLen));
+  assert(MaxInputLen > 0);
+
+  // Test the callback with empty input and never try it again.
+  uint8_t dummy = 0;
+  ExecuteCallback(&dummy, 0);
+
+  if (CorporaFiles.empty()) {
+
+    Printf("INFO: A corpus is not provided, starting from an empty corpus\n");
+    Unit U({'\n'});  // Valid ASCII input.
+    RunOne(U.data(), U.size());
+
+  } else {
+
+    Printf(
+        "INFO: seed corpus: files: %zd min: %zdb max: %zdb total: %zdb"
+        " rss: %zdMb\n",
+        CorporaFiles.size(), MinSize, MaxSize, TotalSize, GetPeakRSSMb());
+    if (Options.ShuffleAtStartUp)
+      std::shuffle(CorporaFiles.begin(), CorporaFiles.end(), MD.GetRand());
+
+    if (Options.PreferSmall) {
+
+      std::stable_sort(CorporaFiles.begin(), CorporaFiles.end());
+      assert(CorporaFiles.front().Size <= CorporaFiles.back().Size);
+
+    }
+
+    // Load and execute inputs one by one.
+    for (auto &SF : CorporaFiles) {
+
+      auto U = FileToVector(SF.File, MaxInputLen, /*ExitOnError=*/false);
+      assert(U.size() <= MaxInputLen);
+      RunOne(U.data(), U.size(), /*MayDeleteFile*/ false, /*II*/ nullptr,
+             /*ForceAddToCorpus*/ Options.KeepSeed,
+             /*FoundUniqFeatures*/ nullptr);
+      CheckExitOnSrcPosOrItem();
+      TryDetectingAMemoryLeak(U.data(), U.size(),
+                              /*DuringInitialCorpusExecution*/ true);
+
+    }
+
+  }
+
+  PrintStats("INITED");
+  if (!Options.FocusFunction.empty()) {
+
+    Printf("INFO: %zd/%zd inputs touch the focus function\n",
+           Corpus.NumInputsThatTouchFocusFunction(), Corpus.size());
+    if (!Options.DataFlowTrace.empty())
+      Printf("INFO: %zd/%zd inputs have the Data Flow Trace\n",
+             Corpus.NumInputsWithDataFlowTrace(),
+             Corpus.NumInputsThatTouchFocusFunction());
+
+  }
+
+  if (Corpus.empty() && Options.MaxNumberOfRuns) {
+
+    Printf(
+        "ERROR: no interesting inputs were found. "
+        "Is the code instrumented for coverage? Exiting.\n");
+    exit(1);
+
+  }
+
+}
+
+void Fuzzer::Loop(Vector<SizedFile> &CorporaFiles) {
+
+  auto FocusFunctionOrAuto = Options.FocusFunction;
+  DFT.Init(Options.DataFlowTrace, &FocusFunctionOrAuto, CorporaFiles,
+           MD.GetRand());
+  TPC.SetFocusFunction(FocusFunctionOrAuto);
+  ReadAndExecuteSeedCorpora(CorporaFiles);
+  DFT.Clear();  // No need for DFT any more.
+  TPC.SetPrintNewPCs(Options.PrintNewCovPcs);
+  TPC.SetPrintNewFuncs(Options.PrintNewCovFuncs);
+  system_clock::time_point LastCorpusReload = system_clock::now();
+
+  TmpMaxMutationLen =
+      Min(MaxMutationLen, Max(size_t(4), Corpus.MaxInputSize()));
+
+  while (true) {
+
+    auto Now = system_clock::now();
+    if (!Options.StopFile.empty() &&
+        !FileToVector(Options.StopFile, 1, false).empty())
+      break;
+    if (duration_cast<seconds>(Now - LastCorpusReload).count() >=
+        Options.ReloadIntervalSec) {
+
+      RereadOutputCorpus(MaxInputLen);
+      LastCorpusReload = system_clock::now();
+
+    }
+
+    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns) break;
+    if (TimedOut()) break;
+
+    // Update TmpMaxMutationLen
+    if (Options.LenControl) {
+
+      if (TmpMaxMutationLen < MaxMutationLen &&
+          TotalNumberOfRuns - LastCorpusUpdateRun >
+              Options.LenControl * Log(TmpMaxMutationLen)) {
+
+        TmpMaxMutationLen =
+            Min(MaxMutationLen, TmpMaxMutationLen + Log(TmpMaxMutationLen));
+        LastCorpusUpdateRun = TotalNumberOfRuns;
+
+      }
+
+    } else {
+
+      TmpMaxMutationLen = MaxMutationLen;
+
+    }
+
+    // Perform several mutations and runs.
+    MutateAndTestOne();
+
+    PurgeAllocator();
+
+  }
+
+  PrintStats("DONE  ", "\n");
+  MD.PrintRecommendedDictionary();
+
+}
+
+void Fuzzer::MinimizeCrashLoop(const Unit &U) {
+
+  if (U.size() <= 1) return;
+  while (!TimedOut() && TotalNumberOfRuns < Options.MaxNumberOfRuns) {
+
+    MD.StartMutationSequence();
+    memcpy(CurrentUnitData, U.data(), U.size());
+    for (int i = 0; i < Options.MutateDepth; i++) {
+
+      size_t NewSize = MD.Mutate(CurrentUnitData, U.size(), MaxMutationLen);
+      assert(NewSize > 0 && NewSize <= MaxMutationLen);
+      ExecuteCallback(CurrentUnitData, NewSize);
+      PrintPulseAndReportSlowInput(CurrentUnitData, NewSize);
+      TryDetectingAMemoryLeak(CurrentUnitData, NewSize,
+                              /*DuringInitialCorpusExecution*/ false);
+
+    }
+
+  }
+
+}
+
+}  // namespace fuzzer
+
+extern "C" {
+
+ATTRIBUTE_INTERFACE size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size,
+                                            size_t MaxSize) {
+
+  assert(fuzzer::F);
+  return fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
+
+}
+
+}  // extern "C"
+
diff --git a/custom_mutators/libfuzzer/FuzzerMerge.cpp b/custom_mutators/libfuzzer/FuzzerMerge.cpp
new file mode 100644
index 00000000..b341f5b3
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerMerge.cpp
@@ -0,0 +1,485 @@
+//===- FuzzerMerge.cpp - merging corpora ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Merging corpora.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerCommand.h"
+#include "FuzzerMerge.h"
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include "FuzzerTracePC.h"
+#include "FuzzerUtil.h"
+
+#include <fstream>
+#include <iterator>
+#include <set>
+#include <sstream>
+#include <unordered_set>
+
+namespace fuzzer {
+
+bool Merger::Parse(const std::string &Str, bool ParseCoverage) {
+
+  std::istringstream SS(Str);
+  return Parse(SS, ParseCoverage);
+
+}
+
+void Merger::ParseOrExit(std::istream &IS, bool ParseCoverage) {
+
+  if (!Parse(IS, ParseCoverage)) {
+
+    Printf("MERGE: failed to parse the control file (unexpected error)\n");
+    exit(1);
+
+  }
+
+}
+
+// The control file example:
+//
+// 3 # The number of inputs
+// 1 # The number of inputs in the first corpus, <= the previous number
+// file0
+// file1
+// file2  # One file name per line.
+// STARTED 0 123  # FileID, file size
+// FT 0 1 4 6 8  # FileID COV1 COV2 ...
+// COV 0 7 8 9 # FileID COV1 COV1
+// STARTED 1 456  # If FT is missing, the input crashed while processing.
+// STARTED 2 567
+// FT 2 8 9
+// COV 2 11 12
+bool Merger::Parse(std::istream &IS, bool ParseCoverage) {
+
+  LastFailure.clear();
+  std::string Line;
+
+  // Parse NumFiles.
+  if (!std::getline(IS, Line, '\n')) return false;
+  std::istringstream L1(Line);
+  size_t             NumFiles = 0;
+  L1 >> NumFiles;
+  if (NumFiles == 0 || NumFiles > 10000000) return false;
+
+  // Parse NumFilesInFirstCorpus.
+  if (!std::getline(IS, Line, '\n')) return false;
+  std::istringstream L2(Line);
+  NumFilesInFirstCorpus = NumFiles + 1;
+  L2 >> NumFilesInFirstCorpus;
+  if (NumFilesInFirstCorpus > NumFiles) return false;
+
+  // Parse file names.
+  Files.resize(NumFiles);
+  for (size_t i = 0; i < NumFiles; i++)
+    if (!std::getline(IS, Files[i].Name, '\n')) return false;
+
+  // Parse STARTED, FT, and COV lines.
+  size_t           ExpectedStartMarker = 0;
+  const size_t     kInvalidStartMarker = -1;
+  size_t           LastSeenStartMarker = kInvalidStartMarker;
+  Vector<uint32_t> TmpFeatures;
+  Set<uint32_t>    PCs;
+  while (std::getline(IS, Line, '\n')) {
+
+    std::istringstream ISS1(Line);
+    std::string        Marker;
+    size_t             N;
+    ISS1 >> Marker;
+    ISS1 >> N;
+    if (Marker == "STARTED") {
+
+      // STARTED FILE_ID FILE_SIZE
+      if (ExpectedStartMarker != N) return false;
+      ISS1 >> Files[ExpectedStartMarker].Size;
+      LastSeenStartMarker = ExpectedStartMarker;
+      assert(ExpectedStartMarker < Files.size());
+      ExpectedStartMarker++;
+
+    } else if (Marker == "FT") {
+
+      // FT FILE_ID COV1 COV2 COV3 ...
+      size_t CurrentFileIdx = N;
+      if (CurrentFileIdx != LastSeenStartMarker) return false;
+      LastSeenStartMarker = kInvalidStartMarker;
+      if (ParseCoverage) {
+
+        TmpFeatures.clear();  // use a vector from outer scope to avoid resizes.
+        while (ISS1 >> N)
+          TmpFeatures.push_back(N);
+        std::sort(TmpFeatures.begin(), TmpFeatures.end());
+        Files[CurrentFileIdx].Features = TmpFeatures;
+
+      }
+
+    } else if (Marker == "COV") {
+
+      size_t CurrentFileIdx = N;
+      if (ParseCoverage)
+        while (ISS1 >> N)
+          if (PCs.insert(N).second) Files[CurrentFileIdx].Cov.push_back(N);
+
+    } else {
+
+      return false;
+
+    }
+
+  }
+
+  if (LastSeenStartMarker != kInvalidStartMarker)
+    LastFailure = Files[LastSeenStartMarker].Name;
+
+  FirstNotProcessedFile = ExpectedStartMarker;
+  return true;
+
+}
+
+size_t Merger::ApproximateMemoryConsumption() const {
+
+  size_t Res = 0;
+  for (const auto &F : Files)
+    Res += sizeof(F) + F.Features.size() * sizeof(F.Features[0]);
+  return Res;
+
+}
+
+// Decides which files need to be merged (add those to NewFiles).
+// Returns the number of new features added.
+size_t Merger::Merge(const Set<uint32_t> &InitialFeatures,
+                     Set<uint32_t> *      NewFeatures,
+                     const Set<uint32_t> &InitialCov, Set<uint32_t> *NewCov,
+                     Vector<std::string> *NewFiles) {
+
+  NewFiles->clear();
+  assert(NumFilesInFirstCorpus <= Files.size());
+  Set<uint32_t> AllFeatures = InitialFeatures;
+
+  // What features are in the initial corpus?
+  for (size_t i = 0; i < NumFilesInFirstCorpus; i++) {
+
+    auto &Cur = Files[i].Features;
+    AllFeatures.insert(Cur.begin(), Cur.end());
+
+  }
+
+  // Remove all features that we already know from all other inputs.
+  for (size_t i = NumFilesInFirstCorpus; i < Files.size(); i++) {
+
+    auto &           Cur = Files[i].Features;
+    Vector<uint32_t> Tmp;
+    std::set_difference(Cur.begin(), Cur.end(), AllFeatures.begin(),
+                        AllFeatures.end(), std::inserter(Tmp, Tmp.begin()));
+    Cur.swap(Tmp);
+
+  }
+
+  // Sort. Give preference to
+  //   * smaller files
+  //   * files with more features.
+  std::sort(Files.begin() + NumFilesInFirstCorpus, Files.end(),
+            [&](const MergeFileInfo &a, const MergeFileInfo &b) -> bool {
+
+              if (a.Size != b.Size) return a.Size < b.Size;
+              return a.Features.size() > b.Features.size();
+
+            });
+
+  // One greedy pass: add the file's features to AllFeatures.
+  // If new features were added, add this file to NewFiles.
+  for (size_t i = NumFilesInFirstCorpus; i < Files.size(); i++) {
+
+    auto &Cur = Files[i].Features;
+    // Printf("%s -> sz %zd ft %zd\n", Files[i].Name.c_str(),
+    //       Files[i].Size, Cur.size());
+    bool FoundNewFeatures = false;
+    for (auto Fe : Cur) {
+
+      if (AllFeatures.insert(Fe).second) {
+
+        FoundNewFeatures = true;
+        NewFeatures->insert(Fe);
+
+      }
+
+    }
+
+    if (FoundNewFeatures) NewFiles->push_back(Files[i].Name);
+    for (auto Cov : Files[i].Cov)
+      if (InitialCov.find(Cov) == InitialCov.end()) NewCov->insert(Cov);
+
+  }
+
+  return NewFeatures->size();
+
+}
+
+Set<uint32_t> Merger::AllFeatures() const {
+
+  Set<uint32_t> S;
+  for (auto &File : Files)
+    S.insert(File.Features.begin(), File.Features.end());
+  return S;
+
+}
+
+// Inner process. May crash if the target crashes.
+void Fuzzer::CrashResistantMergeInternalStep(const std::string &CFPath) {
+
+  Printf("MERGE-INNER: using the control file '%s'\n", CFPath.c_str());
+  Merger        M;
+  std::ifstream IF(CFPath);
+  M.ParseOrExit(IF, false);
+  IF.close();
+  if (!M.LastFailure.empty())
+    Printf("MERGE-INNER: '%s' caused a failure at the previous merge step\n",
+           M.LastFailure.c_str());
+
+  Printf(
+      "MERGE-INNER: %zd total files;"
+      " %zd processed earlier; will process %zd files now\n",
+      M.Files.size(), M.FirstNotProcessedFile,
+      M.Files.size() - M.FirstNotProcessedFile);
+
+  std::ofstream OF(CFPath, std::ofstream::out | std::ofstream::app);
+  Set<size_t>   AllFeatures;
+  auto          PrintStatsWrapper = [this, &AllFeatures](const char *Where) {
+
+    this->PrintStats(Where, "\n", 0, AllFeatures.size());
+
+  };
+
+  Set<const TracePC::PCTableEntry *> AllPCs;
+  for (size_t i = M.FirstNotProcessedFile; i < M.Files.size(); i++) {
+
+    Fuzzer::MaybeExitGracefully();
+    auto U = FileToVector(M.Files[i].Name);
+    if (U.size() > MaxInputLen) {
+
+      U.resize(MaxInputLen);
+      U.shrink_to_fit();
+
+    }
+
+    // Write the pre-run marker.
+    OF << "STARTED " << i << " " << U.size() << "\n";
+    OF.flush();  // Flush is important since Command::Execute may crash.
+    // Run.
+    TPC.ResetMaps();
+    ExecuteCallback(U.data(), U.size());
+    // Collect coverage. We are iterating over the files in this order:
+    // * First, files in the initial corpus ordered by size, smallest first.
+    // * Then, all other files, smallest first.
+    // So it makes no sense to record all features for all files, instead we
+    // only record features that were not seen before.
+    Set<size_t> UniqFeatures;
+    TPC.CollectFeatures([&](size_t Feature) {
+
+      if (AllFeatures.insert(Feature).second) UniqFeatures.insert(Feature);
+
+    });
+
+    TPC.UpdateObservedPCs();
+    // Show stats.
+    if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)))
+      PrintStatsWrapper("pulse ");
+    if (TotalNumberOfRuns == M.NumFilesInFirstCorpus)
+      PrintStatsWrapper("LOADED");
+    // Write the post-run marker and the coverage.
+    OF << "FT " << i;
+    for (size_t F : UniqFeatures)
+      OF << " " << F;
+    OF << "\n";
+    OF << "COV " << i;
+    TPC.ForEachObservedPC([&](const TracePC::PCTableEntry *TE) {
+
+      if (AllPCs.insert(TE).second) OF << " " << TPC.PCTableEntryIdx(TE);
+
+    });
+
+    OF << "\n";
+    OF.flush();
+
+  }
+
+  PrintStatsWrapper("DONE  ");
+
+}
+
+static size_t WriteNewControlFile(const std::string &          CFPath,
+                                  const Vector<SizedFile> &    OldCorpus,
+                                  const Vector<SizedFile> &    NewCorpus,
+                                  const Vector<MergeFileInfo> &KnownFiles) {
+
+  std::unordered_set<std::string> FilesToSkip;
+  for (auto &SF : KnownFiles)
+    FilesToSkip.insert(SF.Name);
+
+  Vector<std::string> FilesToUse;
+  auto                MaybeUseFile = [=, &FilesToUse](std::string Name) {
+
+    if (FilesToSkip.find(Name) == FilesToSkip.end()) FilesToUse.push_back(Name);
+
+  };
+
+  for (auto &SF : OldCorpus)
+    MaybeUseFile(SF.File);
+  auto FilesToUseFromOldCorpus = FilesToUse.size();
+  for (auto &SF : NewCorpus)
+    MaybeUseFile(SF.File);
+
+  RemoveFile(CFPath);
+  std::ofstream ControlFile(CFPath);
+  ControlFile << FilesToUse.size() << "\n";
+  ControlFile << FilesToUseFromOldCorpus << "\n";
+  for (auto &FN : FilesToUse)
+    ControlFile << FN << "\n";
+
+  if (!ControlFile) {
+
+    Printf("MERGE-OUTER: failed to write to the control file: %s\n",
+           CFPath.c_str());
+    exit(1);
+
+  }
+
+  return FilesToUse.size();
+
+}
+
+// Outer process. Does not call the target code and thus should not fail.
+void CrashResistantMerge(const Vector<std::string> &Args,
+                         const Vector<SizedFile> &  OldCorpus,
+                         const Vector<SizedFile> &  NewCorpus,
+                         Vector<std::string> *      NewFiles,
+                         const Set<uint32_t> &      InitialFeatures,
+                         Set<uint32_t> *            NewFeatures,
+                         const Set<uint32_t> &InitialCov, Set<uint32_t> *NewCov,
+                         const std::string &CFPath, bool V /*Verbose*/) {
+
+  if (NewCorpus.empty() && OldCorpus.empty()) return;  // Nothing to merge.
+  size_t                NumAttempts = 0;
+  Vector<MergeFileInfo> KnownFiles;
+  if (FileSize(CFPath)) {
+
+    VPrintf(V, "MERGE-OUTER: non-empty control file provided: '%s'\n",
+            CFPath.c_str());
+    Merger        M;
+    std::ifstream IF(CFPath);
+    if (M.Parse(IF, /*ParseCoverage=*/true)) {
+
+      VPrintf(V,
+              "MERGE-OUTER: control file ok, %zd files total,"
+              " first not processed file %zd\n",
+              M.Files.size(), M.FirstNotProcessedFile);
+      if (!M.LastFailure.empty())
+        VPrintf(V,
+                "MERGE-OUTER: '%s' will be skipped as unlucky "
+                "(merge has stumbled on it the last time)\n",
+                M.LastFailure.c_str());
+      if (M.FirstNotProcessedFile >= M.Files.size()) {
+
+        // Merge has already been completed with the given merge control file.
+        if (M.Files.size() == OldCorpus.size() + NewCorpus.size()) {
+
+          VPrintf(
+              V,
+              "MERGE-OUTER: nothing to do, merge has been completed before\n");
+          exit(0);
+
+        }
+
+        // Number of input files likely changed, start merge from scratch, but
+        // reuse coverage information from the given merge control file.
+        VPrintf(
+            V,
+            "MERGE-OUTER: starting merge from scratch, but reusing coverage "
+            "information from the given control file\n");
+        KnownFiles = M.Files;
+
+      } else {
+
+        // There is a merge in progress, continue.
+        NumAttempts = M.Files.size() - M.FirstNotProcessedFile;
+
+      }
+
+    } else {
+
+      VPrintf(V, "MERGE-OUTER: bad control file, will overwrite it\n");
+
+    }
+
+  }
+
+  if (!NumAttempts) {
+
+    // The supplied control file is empty or bad, create a fresh one.
+    VPrintf(V,
+            "MERGE-OUTER: "
+            "%zd files, %zd in the initial corpus, %zd processed earlier\n",
+            OldCorpus.size() + NewCorpus.size(), OldCorpus.size(),
+            KnownFiles.size());
+    NumAttempts = WriteNewControlFile(CFPath, OldCorpus, NewCorpus, KnownFiles);
+
+  }
+
+  // Execute the inner process until it passes.
+  // Every inner process should execute at least one input.
+  Command BaseCmd(Args);
+  BaseCmd.removeFlag("merge");
+  BaseCmd.removeFlag("fork");
+  BaseCmd.removeFlag("collect_data_flow");
+  for (size_t Attempt = 1; Attempt <= NumAttempts; Attempt++) {
+
+    Fuzzer::MaybeExitGracefully();
+    VPrintf(V, "MERGE-OUTER: attempt %zd\n", Attempt);
+    Command Cmd(BaseCmd);
+    Cmd.addFlag("merge_control_file", CFPath);
+    Cmd.addFlag("merge_inner", "1");
+    if (!V) {
+
+      Cmd.setOutputFile(getDevNull());
+      Cmd.combineOutAndErr();
+
+    }
+
+    auto ExitCode = ExecuteCommand(Cmd);
+    if (!ExitCode) {
+
+      VPrintf(V, "MERGE-OUTER: succesfull in %zd attempt(s)\n", Attempt);
+      break;
+
+    }
+
+  }
+
+  // Read the control file and do the merge.
+  Merger        M;
+  std::ifstream IF(CFPath);
+  IF.seekg(0, IF.end);
+  VPrintf(V, "MERGE-OUTER: the control file has %zd bytes\n",
+          (size_t)IF.tellg());
+  IF.seekg(0, IF.beg);
+  M.ParseOrExit(IF, true);
+  IF.close();
+  VPrintf(V,
+          "MERGE-OUTER: consumed %zdMb (%zdMb rss) to parse the control file\n",
+          M.ApproximateMemoryConsumption() >> 20, GetPeakRSSMb());
+
+  M.Files.insert(M.Files.end(), KnownFiles.begin(), KnownFiles.end());
+  M.Merge(InitialFeatures, NewFeatures, InitialCov, NewCov, NewFiles);
+  VPrintf(V,
+          "MERGE-OUTER: %zd new files with %zd new features added; "
+          "%zd new coverage edges\n",
+          NewFiles->size(), NewFeatures->size(), NewCov->size());
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerMerge.h b/custom_mutators/libfuzzer/FuzzerMerge.h
new file mode 100644
index 00000000..e0c6bc53
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerMerge.h
@@ -0,0 +1,87 @@
+//===- FuzzerMerge.h - merging corpa ----------------------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Merging Corpora.
+//
+// The task:
+//   Take the existing corpus (possibly empty) and merge new inputs into
+//   it so that only inputs with new coverage ('features') are added.
+//   The process should tolerate the crashes, OOMs, leaks, etc.
+//
+// Algorithm:
+//   The outer process collects the set of files and writes their names
+//   into a temporary "control" file, then repeatedly launches the inner
+//   process until all inputs are processed.
+//   The outer process does not actually execute the target code.
+//
+//   The inner process reads the control file and sees a) list of all the inputs
+//   and b) the last processed input. Then it starts processing the inputs one
+//   by one. Before processing every input it writes one line to control file:
+//   STARTED INPUT_ID INPUT_SIZE
+//   After processing an input it writes the following lines:
+//   FT INPUT_ID Feature1 Feature2 Feature3 ...
+//   COV INPUT_ID Coverage1 Coverage2 Coverage3 ...
+//   If a crash happens while processing an input the last line in the control
+//   file will be "STARTED INPUT_ID" and so the next process will know
+//   where to resume.
+//
+//   Once all inputs are processed by the inner process(es) the outer process
+//   reads the control files and does the merge based entirely on the contents
+//   of control file.
+//   It uses a single pass greedy algorithm choosing first the smallest inputs
+//   within the same size the inputs that have more new features.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_MERGE_H
+#define LLVM_FUZZER_MERGE_H
+
+#include "FuzzerDefs.h"
+
+#include <istream>
+#include <ostream>
+#include <set>
+#include <vector>
+
+namespace fuzzer {
+
+struct MergeFileInfo {
+  std::string Name;
+  size_t Size = 0;
+  Vector<uint32_t> Features, Cov;
+};
+
+struct Merger {
+  Vector<MergeFileInfo> Files;
+  size_t NumFilesInFirstCorpus = 0;
+  size_t FirstNotProcessedFile = 0;
+  std::string LastFailure;
+
+  bool Parse(std::istream &IS, bool ParseCoverage);
+  bool Parse(const std::string &Str, bool ParseCoverage);
+  void ParseOrExit(std::istream &IS, bool ParseCoverage);
+  size_t Merge(const Set<uint32_t> &InitialFeatures, Set<uint32_t> *NewFeatures,
+               const Set<uint32_t> &InitialCov, Set<uint32_t> *NewCov,
+               Vector<std::string> *NewFiles);
+  size_t ApproximateMemoryConsumption() const;
+  Set<uint32_t> AllFeatures() const;
+};
+
+void CrashResistantMerge(const Vector<std::string> &Args,
+                         const Vector<SizedFile> &OldCorpus,
+                         const Vector<SizedFile> &NewCorpus,
+                         Vector<std::string> *NewFiles,
+                         const Set<uint32_t> &InitialFeatures,
+                         Set<uint32_t> *NewFeatures,
+                         const Set<uint32_t> &InitialCov,
+                         Set<uint32_t> *NewCov,
+                         const std::string &CFPath,
+                         bool Verbose);
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_MERGE_H
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.cpp b/custom_mutators/libfuzzer/FuzzerMutate.cpp
new file mode 100644
index 00000000..8faf6918
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerMutate.cpp
@@ -0,0 +1,720 @@
+//===- FuzzerMutate.cpp - Mutate a test input -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Mutate a test input.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#include "FuzzerExtFunctions.h"
+#include "FuzzerIO.h"
+#include "FuzzerMutate.h"
+#include "FuzzerOptions.h"
+#include "FuzzerTracePC.h"
+
+namespace fuzzer {
+
+const size_t Dictionary::kMaxDictSize;
+
+static void PrintASCII(const Word &W, const char *PrintAfter) {
+
+  PrintASCII(W.data(), W.size(), PrintAfter);
+
+}
+
+MutationDispatcher::MutationDispatcher(Random &              Rand,
+                                       const FuzzingOptions &Options)
+    : Rand(Rand), Options(Options) {
+
+  DefaultMutators.insert(
+      DefaultMutators.begin(),
+      {
+
+          {&MutationDispatcher::Mutate_EraseBytes, "EraseBytes"},
+          {&MutationDispatcher::Mutate_InsertByte, "InsertByte"},
+          {&MutationDispatcher::Mutate_InsertRepeatedBytes,
+           "InsertRepeatedBytes"},
+          {&MutationDispatcher::Mutate_ChangeByte, "ChangeByte"},
+          {&MutationDispatcher::Mutate_ChangeBit, "ChangeBit"},
+          {&MutationDispatcher::Mutate_ShuffleBytes, "ShuffleBytes"},
+          {&MutationDispatcher::Mutate_ChangeASCIIInteger, "ChangeASCIIInt"},
+          {&MutationDispatcher::Mutate_ChangeBinaryInteger, "ChangeBinInt"},
+          {&MutationDispatcher::Mutate_CopyPart, "CopyPart"},
+          {&MutationDispatcher::Mutate_CrossOver, "CrossOver"},
+          {&MutationDispatcher::Mutate_AddWordFromManualDictionary,
+           "ManualDict"},
+          {&MutationDispatcher::Mutate_AddWordFromPersistentAutoDictionary,
+           "PersAutoDict"},
+
+      });
+
+  if (Options.UseCmp)
+    DefaultMutators.push_back(
+        {&MutationDispatcher::Mutate_AddWordFromTORC, "CMP"});
+
+  if (EF->LLVMFuzzerCustomMutator)
+    Mutators.push_back({&MutationDispatcher::Mutate_Custom, "Custom"});
+  else
+    Mutators = DefaultMutators;
+
+  if (EF->LLVMFuzzerCustomCrossOver)
+    Mutators.push_back(
+        {&MutationDispatcher::Mutate_CustomCrossOver, "CustomCrossOver"});
+
+}
+
+static char RandCh(Random &Rand) {
+
+  if (Rand.RandBool()) return Rand(256);
+  const char Special[] = "!*'();:@&=+$,/?%#[]012Az-`~.\xff\x00";
+  return Special[Rand(sizeof(Special) - 1)];
+
+}
+
+size_t MutationDispatcher::Mutate_Custom(uint8_t *Data, size_t Size,
+                                         size_t MaxSize) {
+
+  return EF->LLVMFuzzerCustomMutator(Data, Size, MaxSize, Rand.Rand());
+
+}
+
+size_t MutationDispatcher::Mutate_CustomCrossOver(uint8_t *Data, size_t Size,
+                                                  size_t MaxSize) {
+
+  if (Size == 0) return 0;
+  if (!CrossOverWith) return 0;
+  const Unit &Other = *CrossOverWith;
+  if (Other.empty()) return 0;
+  CustomCrossOverInPlaceHere.resize(MaxSize);
+  auto & U = CustomCrossOverInPlaceHere;
+  size_t NewSize = EF->LLVMFuzzerCustomCrossOver(
+      Data, Size, Other.data(), Other.size(), U.data(), U.size(), Rand.Rand());
+  if (!NewSize) return 0;
+  assert(NewSize <= MaxSize && "CustomCrossOver returned overisized unit");
+  memcpy(Data, U.data(), NewSize);
+  return NewSize;
+
+}
+
+size_t MutationDispatcher::Mutate_ShuffleBytes(uint8_t *Data, size_t Size,
+                                               size_t MaxSize) {
+
+  if (Size > MaxSize || Size == 0) return 0;
+  size_t ShuffleAmount =
+      Rand(std::min(Size, (size_t)8)) + 1;  // [1,8] and <= Size.
+  size_t ShuffleStart = Rand(Size - ShuffleAmount);
+  assert(ShuffleStart + ShuffleAmount <= Size);
+  std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, Rand);
+  return Size;
+
+}
+
+size_t MutationDispatcher::Mutate_EraseBytes(uint8_t *Data, size_t Size,
+                                             size_t MaxSize) {
+
+  if (Size <= 1) return 0;
+  size_t N = Rand(Size / 2) + 1;
+  assert(N < Size);
+  size_t Idx = Rand(Size - N + 1);
+  // Erase Data[Idx:Idx+N].
+  memmove(Data + Idx, Data + Idx + N, Size - Idx - N);
+  // Printf("Erase: %zd %zd => %zd; Idx %zd\n", N, Size, Size - N, Idx);
+  return Size - N;
+
+}
+
+size_t MutationDispatcher::Mutate_InsertByte(uint8_t *Data, size_t Size,
+                                             size_t MaxSize) {
+
+  if (Size >= MaxSize) return 0;
+  size_t Idx = Rand(Size + 1);
+  // Insert new value at Data[Idx].
+  memmove(Data + Idx + 1, Data + Idx, Size - Idx);
+  Data[Idx] = RandCh(Rand);
+  return Size + 1;
+
+}
+
+size_t MutationDispatcher::Mutate_InsertRepeatedBytes(uint8_t *Data,
+                                                      size_t   Size,
+                                                      size_t   MaxSize) {
+
+  const size_t kMinBytesToInsert = 3;
+  if (Size + kMinBytesToInsert >= MaxSize) return 0;
+  size_t MaxBytesToInsert = std::min(MaxSize - Size, (size_t)128);
+  size_t N = Rand(MaxBytesToInsert - kMinBytesToInsert + 1) + kMinBytesToInsert;
+  assert(Size + N <= MaxSize && N);
+  size_t Idx = Rand(Size + 1);
+  // Insert new values at Data[Idx].
+  memmove(Data + Idx + N, Data + Idx, Size - Idx);
+  // Give preference to 0x00 and 0xff.
+  uint8_t Byte = Rand.RandBool() ? Rand(256) : (Rand.RandBool() ? 0 : 255);
+  for (size_t i = 0; i < N; i++)
+    Data[Idx + i] = Byte;
+  return Size + N;
+
+}
+
+size_t MutationDispatcher::Mutate_ChangeByte(uint8_t *Data, size_t Size,
+                                             size_t MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  size_t Idx = Rand(Size);
+  Data[Idx] = RandCh(Rand);
+  return Size;
+
+}
+
+size_t MutationDispatcher::Mutate_ChangeBit(uint8_t *Data, size_t Size,
+                                            size_t MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  size_t Idx = Rand(Size);
+  Data[Idx] ^= 1 << Rand(8);
+  return Size;
+
+}
+
+size_t MutationDispatcher::Mutate_AddWordFromManualDictionary(uint8_t *Data,
+                                                              size_t   Size,
+                                                              size_t MaxSize) {
+
+  return AddWordFromDictionary(ManualDictionary, Data, Size, MaxSize);
+
+}
+
+size_t MutationDispatcher::ApplyDictionaryEntry(uint8_t *Data, size_t Size,
+                                                size_t           MaxSize,
+                                                DictionaryEntry &DE) {
+
+  const Word &W = DE.GetW();
+  bool        UsePositionHint = DE.HasPositionHint() &&
+                         DE.GetPositionHint() + W.size() < Size &&
+                         Rand.RandBool();
+  if (Rand.RandBool()) {  // Insert W.
+    if (Size + W.size() > MaxSize) return 0;
+    size_t Idx = UsePositionHint ? DE.GetPositionHint() : Rand(Size + 1);
+    memmove(Data + Idx + W.size(), Data + Idx, Size - Idx);
+    memcpy(Data + Idx, W.data(), W.size());
+    Size += W.size();
+
+  } else {  // Overwrite some bytes with W.
+
+    if (W.size() > Size) return 0;
+    size_t Idx = UsePositionHint ? DE.GetPositionHint() : Rand(Size - W.size());
+    memcpy(Data + Idx, W.data(), W.size());
+
+  }
+
+  return Size;
+
+}
+
+// Somewhere in the past we have observed a comparison instructions
+// with arguments Arg1 Arg2. This function tries to guess a dictionary
+// entry that will satisfy that comparison.
+// It first tries to find one of the arguments (possibly swapped) in the
+// input and if it succeeds it creates a DE with a position hint.
+// Otherwise it creates a DE with one of the arguments w/o a position hint.
+DictionaryEntry MutationDispatcher::MakeDictionaryEntryFromCMP(
+    const void *Arg1, const void *Arg2, const void *Arg1Mutation,
+    const void *Arg2Mutation, size_t ArgSize, const uint8_t *Data,
+    size_t Size) {
+
+  bool           HandleFirst = Rand.RandBool();
+  const void *   ExistingBytes, *DesiredBytes;
+  Word           W;
+  const uint8_t *End = Data + Size;
+  for (int Arg = 0; Arg < 2; Arg++) {
+
+    ExistingBytes = HandleFirst ? Arg1 : Arg2;
+    DesiredBytes = HandleFirst ? Arg2Mutation : Arg1Mutation;
+    HandleFirst = !HandleFirst;
+    W.Set(reinterpret_cast<const uint8_t *>(DesiredBytes), ArgSize);
+    const size_t kMaxNumPositions = 8;
+    size_t       Positions[kMaxNumPositions];
+    size_t       NumPositions = 0;
+    for (const uint8_t *Cur = Data;
+         Cur < End && NumPositions < kMaxNumPositions; Cur++) {
+
+      Cur =
+          (const uint8_t *)SearchMemory(Cur, End - Cur, ExistingBytes, ArgSize);
+      if (!Cur) break;
+      Positions[NumPositions++] = Cur - Data;
+
+    }
+
+    if (!NumPositions) continue;
+    return DictionaryEntry(W, Positions[Rand(NumPositions)]);
+
+  }
+
+  DictionaryEntry DE(W);
+  return DE;
+
+}
+
+template <class T>
+DictionaryEntry MutationDispatcher::MakeDictionaryEntryFromCMP(
+    T Arg1, T Arg2, const uint8_t *Data, size_t Size) {
+
+  if (Rand.RandBool()) Arg1 = Bswap(Arg1);
+  if (Rand.RandBool()) Arg2 = Bswap(Arg2);
+  T Arg1Mutation = Arg1 + Rand(-1, 1);
+  T Arg2Mutation = Arg2 + Rand(-1, 1);
+  return MakeDictionaryEntryFromCMP(&Arg1, &Arg2, &Arg1Mutation, &Arg2Mutation,
+                                    sizeof(Arg1), Data, Size);
+
+}
+
+DictionaryEntry MutationDispatcher::MakeDictionaryEntryFromCMP(
+    const Word &Arg1, const Word &Arg2, const uint8_t *Data, size_t Size) {
+
+  return MakeDictionaryEntryFromCMP(Arg1.data(), Arg2.data(), Arg1.data(),
+                                    Arg2.data(), Arg1.size(), Data, Size);
+
+}
+
+size_t MutationDispatcher::Mutate_AddWordFromTORC(uint8_t *Data, size_t Size,
+                                                  size_t MaxSize) {
+
+  Word            W;
+  DictionaryEntry DE;
+  switch (Rand(4)) {
+
+    case 0: {
+
+      auto X = TPC.TORC8.Get(Rand.Rand());
+      DE = MakeDictionaryEntryFromCMP(X.A, X.B, Data, Size);
+
+    } break;
+
+    case 1: {
+
+      auto X = TPC.TORC4.Get(Rand.Rand());
+      if ((X.A >> 16) == 0 && (X.B >> 16) == 0 && Rand.RandBool())
+        DE = MakeDictionaryEntryFromCMP((uint16_t)X.A, (uint16_t)X.B, Data,
+                                        Size);
+      else
+        DE = MakeDictionaryEntryFromCMP(X.A, X.B, Data, Size);
+
+    } break;
+
+    case 2: {
+
+      auto X = TPC.TORCW.Get(Rand.Rand());
+      DE = MakeDictionaryEntryFromCMP(X.A, X.B, Data, Size);
+
+    } break;
+
+    case 3:
+      if (Options.UseMemmem) {
+
+        auto X = TPC.MMT.Get(Rand.Rand());
+        DE = DictionaryEntry(X);
+
+      }
+
+      break;
+    default:
+      assert(0);
+
+  }
+
+  if (!DE.GetW().size()) return 0;
+  Size = ApplyDictionaryEntry(Data, Size, MaxSize, DE);
+  if (!Size) return 0;
+  DictionaryEntry &DERef =
+      CmpDictionaryEntriesDeque[CmpDictionaryEntriesDequeIdx++ %
+                                kCmpDictionaryEntriesDequeSize];
+  DERef = DE;
+  CurrentDictionaryEntrySequence.push_back(&DERef);
+  return Size;
+
+}
+
+size_t MutationDispatcher::Mutate_AddWordFromPersistentAutoDictionary(
+    uint8_t *Data, size_t Size, size_t MaxSize) {
+
+  return AddWordFromDictionary(PersistentAutoDictionary, Data, Size, MaxSize);
+
+}
+
+size_t MutationDispatcher::AddWordFromDictionary(Dictionary &D, uint8_t *Data,
+                                                 size_t Size, size_t MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  if (D.empty()) return 0;
+  DictionaryEntry &DE = D[Rand(D.size())];
+  Size = ApplyDictionaryEntry(Data, Size, MaxSize, DE);
+  if (!Size) return 0;
+  DE.IncUseCount();
+  CurrentDictionaryEntrySequence.push_back(&DE);
+  return Size;
+
+}
+
+// Overwrites part of To[0,ToSize) with a part of From[0,FromSize).
+// Returns ToSize.
+size_t MutationDispatcher::CopyPartOf(const uint8_t *From, size_t FromSize,
+                                      uint8_t *To, size_t ToSize) {
+
+  // Copy From[FromBeg, FromBeg + CopySize) into To[ToBeg, ToBeg + CopySize).
+  size_t ToBeg = Rand(ToSize);
+  size_t CopySize = Rand(ToSize - ToBeg) + 1;
+  assert(ToBeg + CopySize <= ToSize);
+  CopySize = std::min(CopySize, FromSize);
+  size_t FromBeg = Rand(FromSize - CopySize + 1);
+  assert(FromBeg + CopySize <= FromSize);
+  memmove(To + ToBeg, From + FromBeg, CopySize);
+  return ToSize;
+
+}
+
+// Inserts part of From[0,ToSize) into To.
+// Returns new size of To on success or 0 on failure.
+size_t MutationDispatcher::InsertPartOf(const uint8_t *From, size_t FromSize,
+                                        uint8_t *To, size_t ToSize,
+                                        size_t MaxToSize) {
+
+  if (ToSize >= MaxToSize) return 0;
+  size_t AvailableSpace = MaxToSize - ToSize;
+  size_t MaxCopySize = std::min(AvailableSpace, FromSize);
+  size_t CopySize = Rand(MaxCopySize) + 1;
+  size_t FromBeg = Rand(FromSize - CopySize + 1);
+  assert(FromBeg + CopySize <= FromSize);
+  size_t ToInsertPos = Rand(ToSize + 1);
+  assert(ToInsertPos + CopySize <= MaxToSize);
+  size_t TailSize = ToSize - ToInsertPos;
+  if (To == From) {
+
+    MutateInPlaceHere.resize(MaxToSize);
+    memcpy(MutateInPlaceHere.data(), From + FromBeg, CopySize);
+    memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);
+    memmove(To + ToInsertPos, MutateInPlaceHere.data(), CopySize);
+
+  } else {
+
+    memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);
+    memmove(To + ToInsertPos, From + FromBeg, CopySize);
+
+  }
+
+  return ToSize + CopySize;
+
+}
+
+size_t MutationDispatcher::Mutate_CopyPart(uint8_t *Data, size_t Size,
+                                           size_t MaxSize) {
+
+  if (Size > MaxSize || Size == 0) return 0;
+  // If Size == MaxSize, `InsertPartOf(...)` will
+  // fail so there's no point using it in this case.
+  if (Size == MaxSize || Rand.RandBool())
+    return CopyPartOf(Data, Size, Data, Size);
+  else
+    return InsertPartOf(Data, Size, Data, Size, MaxSize);
+
+}
+
+size_t MutationDispatcher::Mutate_ChangeASCIIInteger(uint8_t *Data, size_t Size,
+                                                     size_t MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  size_t B = Rand(Size);
+  while (B < Size && !isdigit(Data[B]))
+    B++;
+  if (B == Size) return 0;
+  size_t E = B;
+  while (E < Size && isdigit(Data[E]))
+    E++;
+  assert(B < E);
+  // now we have digits in [B, E).
+  // strtol and friends don't accept non-zero-teminated data, parse it manually.
+  uint64_t Val = Data[B] - '0';
+  for (size_t i = B + 1; i < E; i++)
+    Val = Val * 10 + Data[i] - '0';
+
+  // Mutate the integer value.
+  switch (Rand(5)) {
+
+    case 0:
+      Val++;
+      break;
+    case 1:
+      Val--;
+      break;
+    case 2:
+      Val /= 2;
+      break;
+    case 3:
+      Val *= 2;
+      break;
+    case 4:
+      Val = Rand(Val * Val);
+      break;
+    default:
+      assert(0);
+
+  }
+
+  // Just replace the bytes with the new ones, don't bother moving bytes.
+  for (size_t i = B; i < E; i++) {
+
+    size_t Idx = E + B - i - 1;
+    assert(Idx >= B && Idx < E);
+    Data[Idx] = (Val % 10) + '0';
+    Val /= 10;
+
+  }
+
+  return Size;
+
+}
+
+template <class T>
+size_t ChangeBinaryInteger(uint8_t *Data, size_t Size, Random &Rand) {
+
+  if (Size < sizeof(T)) return 0;
+  size_t Off = Rand(Size - sizeof(T) + 1);
+  assert(Off + sizeof(T) <= Size);
+  T Val;
+  if (Off < 64 && !Rand(4)) {
+
+    Val = Size;
+    if (Rand.RandBool()) Val = Bswap(Val);
+
+  } else {
+
+    memcpy(&Val, Data + Off, sizeof(Val));
+    T Add = Rand(21);
+    Add -= 10;
+    if (Rand.RandBool())
+      Val = Bswap(T(Bswap(Val) + Add));  // Add assuming different endiannes.
+    else
+      Val = Val + Add;                // Add assuming current endiannes.
+    if (Add == 0 || Rand.RandBool())  // Maybe negate.
+      Val = -Val;
+
+  }
+
+  memcpy(Data + Off, &Val, sizeof(Val));
+  return Size;
+
+}
+
+size_t MutationDispatcher::Mutate_ChangeBinaryInteger(uint8_t *Data,
+                                                      size_t   Size,
+                                                      size_t   MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  switch (Rand(4)) {
+
+    case 3:
+      return ChangeBinaryInteger<uint64_t>(Data, Size, Rand);
+    case 2:
+      return ChangeBinaryInteger<uint32_t>(Data, Size, Rand);
+    case 1:
+      return ChangeBinaryInteger<uint16_t>(Data, Size, Rand);
+    case 0:
+      return ChangeBinaryInteger<uint8_t>(Data, Size, Rand);
+    default:
+      assert(0);
+
+  }
+
+  return 0;
+
+}
+
+size_t MutationDispatcher::Mutate_CrossOver(uint8_t *Data, size_t Size,
+                                            size_t MaxSize) {
+
+  if (Size > MaxSize) return 0;
+  if (Size == 0) return 0;
+  if (!CrossOverWith) return 0;
+  const Unit &O = *CrossOverWith;
+  if (O.empty()) return 0;
+  size_t NewSize = 0;
+  switch (Rand(3)) {
+
+    case 0:
+      MutateInPlaceHere.resize(MaxSize);
+      NewSize = CrossOver(Data, Size, O.data(), O.size(),
+                          MutateInPlaceHere.data(), MaxSize);
+      memcpy(Data, MutateInPlaceHere.data(), NewSize);
+      break;
+    case 1:
+      NewSize = InsertPartOf(O.data(), O.size(), Data, Size, MaxSize);
+      if (!NewSize) NewSize = CopyPartOf(O.data(), O.size(), Data, Size);
+      break;
+    case 2:
+      NewSize = CopyPartOf(O.data(), O.size(), Data, Size);
+      break;
+    default:
+      assert(0);
+
+  }
+
+  assert(NewSize > 0 && "CrossOver returned empty unit");
+  assert(NewSize <= MaxSize && "CrossOver returned overisized unit");
+  return NewSize;
+
+}
+
+void MutationDispatcher::StartMutationSequence() {
+
+  CurrentMutatorSequence.clear();
+  CurrentDictionaryEntrySequence.clear();
+
+}
+
+// Copy successful dictionary entries to PersistentAutoDictionary.
+void MutationDispatcher::RecordSuccessfulMutationSequence() {
+
+  for (auto DE : CurrentDictionaryEntrySequence) {
+
+    // PersistentAutoDictionary.AddWithSuccessCountOne(DE);
+    DE->IncSuccessCount();
+    assert(DE->GetW().size());
+    // Linear search is fine here as this happens seldom.
+    if (!PersistentAutoDictionary.ContainsWord(DE->GetW()))
+      PersistentAutoDictionary.push_back({DE->GetW(), 1});
+
+  }
+
+}
+
+void MutationDispatcher::PrintRecommendedDictionary() {
+
+  Vector<DictionaryEntry> V;
+  for (auto &DE : PersistentAutoDictionary)
+    if (!ManualDictionary.ContainsWord(DE.GetW())) V.push_back(DE);
+  if (V.empty()) return;
+  Printf("###### Recommended dictionary. ######\n");
+  for (auto &DE : V) {
+
+    assert(DE.GetW().size());
+    Printf("\"");
+    PrintASCII(DE.GetW(), "\"");
+    Printf(" # Uses: %zd\n", DE.GetUseCount());
+
+  }
+
+  Printf("###### End of recommended dictionary. ######\n");
+
+}
+
+void MutationDispatcher::PrintMutationSequence() {
+
+  Printf("MS: %zd ", CurrentMutatorSequence.size());
+  for (auto M : CurrentMutatorSequence)
+    Printf("%s-", M.Name);
+  if (!CurrentDictionaryEntrySequence.empty()) {
+
+    Printf(" DE: ");
+    for (auto DE : CurrentDictionaryEntrySequence) {
+
+      Printf("\"");
+      PrintASCII(DE->GetW(), "\"-");
+
+    }
+
+  }
+
+}
+
+std::string MutationDispatcher::MutationSequence() {
+
+  std::string MS;
+  for (auto M : CurrentMutatorSequence) {
+
+    MS += M.Name;
+    MS += "-";
+
+  }
+
+  return MS;
+
+}
+
+size_t MutationDispatcher::Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
+
+  return MutateImpl(Data, Size, MaxSize, Mutators);
+
+}
+
+size_t MutationDispatcher::DefaultMutate(uint8_t *Data, size_t Size,
+                                         size_t MaxSize) {
+
+  return MutateImpl(Data, Size, MaxSize, DefaultMutators);
+
+}
+
+// Mutates Data in place, returns new size.
+size_t MutationDispatcher::MutateImpl(uint8_t *Data, size_t Size,
+                                      size_t           MaxSize,
+                                      Vector<Mutator> &Mutators) {
+
+  assert(MaxSize > 0);
+  // Some mutations may fail (e.g. can't insert more bytes if Size == MaxSize),
+  // in which case they will return 0.
+  // Try several times before returning un-mutated data.
+  for (int Iter = 0; Iter < 100; Iter++) {
+
+    auto   M = Mutators[Rand(Mutators.size())];
+    size_t NewSize = (this->*(M.Fn))(Data, Size, MaxSize);
+    if (NewSize && NewSize <= MaxSize) {
+
+      if (Options.OnlyASCII) ToASCII(Data, NewSize);
+      CurrentMutatorSequence.push_back(M);
+      return NewSize;
+
+    }
+
+  }
+
+  *Data = ' ';
+  return 1;  // Fallback, should not happen frequently.
+
+}
+
+// Mask represents the set of Data bytes that are worth mutating.
+size_t MutationDispatcher::MutateWithMask(uint8_t *Data, size_t Size,
+                                          size_t                 MaxSize,
+                                          const Vector<uint8_t> &Mask) {
+
+  size_t MaskedSize = std::min(Size, Mask.size());
+  // * Copy the worthy bytes into a temporary array T
+  // * Mutate T
+  // * Copy T back.
+  // This is totally unoptimized.
+  auto &T = MutateWithMaskTemp;
+  if (T.size() < Size) T.resize(Size);
+  size_t OneBits = 0;
+  for (size_t I = 0; I < MaskedSize; I++)
+    if (Mask[I]) T[OneBits++] = Data[I];
+
+  if (!OneBits) return 0;
+  assert(!T.empty());
+  size_t NewSize = Mutate(T.data(), OneBits, OneBits);
+  assert(NewSize <= OneBits);
+  (void)NewSize;
+  // Even if NewSize < OneBits we still use all OneBits bytes.
+  for (size_t I = 0, J = 0; I < MaskedSize; I++)
+    if (Mask[I]) Data[I] = T[J++];
+  return Size;
+
+}
+
+void MutationDispatcher::AddWordToManualDictionary(const Word &W) {
+
+  ManualDictionary.push_back({W, std::numeric_limits<size_t>::max()});
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.h b/custom_mutators/libfuzzer/FuzzerMutate.h
new file mode 100644
index 00000000..3ce3159f
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerMutate.h
@@ -0,0 +1,158 @@
+//===- FuzzerMutate.h - Internal header for the Fuzzer ----------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::MutationDispatcher
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_MUTATE_H
+#define LLVM_FUZZER_MUTATE_H
+
+#include "FuzzerDefs.h"
+#include "FuzzerDictionary.h"
+#include "FuzzerOptions.h"
+#include "FuzzerRandom.h"
+
+namespace fuzzer {
+
+class MutationDispatcher {
+public:
+  MutationDispatcher(Random &Rand, const FuzzingOptions &Options);
+  ~MutationDispatcher() {}
+  /// Indicate that we are about to start a new sequence of mutations.
+  void StartMutationSequence();
+  /// Print the current sequence of mutations.
+  void PrintMutationSequence();
+  /// Return the current sequence of mutations.
+  std::string MutationSequence();
+  /// Indicate that the current sequence of mutations was successful.
+  void RecordSuccessfulMutationSequence();
+  /// Mutates data by invoking user-provided mutator.
+  size_t Mutate_Custom(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by invoking user-provided crossover.
+  size_t Mutate_CustomCrossOver(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by shuffling bytes.
+  size_t Mutate_ShuffleBytes(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by erasing bytes.
+  size_t Mutate_EraseBytes(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by inserting a byte.
+  size_t Mutate_InsertByte(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by inserting several repeated bytes.
+  size_t Mutate_InsertRepeatedBytes(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by chanding one byte.
+  size_t Mutate_ChangeByte(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by chanding one bit.
+  size_t Mutate_ChangeBit(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by copying/inserting a part of data into a different place.
+  size_t Mutate_CopyPart(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Mutates data by adding a word from the manual dictionary.
+  size_t Mutate_AddWordFromManualDictionary(uint8_t *Data, size_t Size,
+                                            size_t MaxSize);
+
+  /// Mutates data by adding a word from the TORC.
+  size_t Mutate_AddWordFromTORC(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Mutates data by adding a word from the persistent automatic dictionary.
+  size_t Mutate_AddWordFromPersistentAutoDictionary(uint8_t *Data, size_t Size,
+                                                    size_t MaxSize);
+
+  /// Tries to find an ASCII integer in Data, changes it to another ASCII int.
+  size_t Mutate_ChangeASCIIInteger(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Change a 1-, 2-, 4-, or 8-byte integer in interesting ways.
+  size_t Mutate_ChangeBinaryInteger(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// CrossOver Data with CrossOverWith.
+  size_t Mutate_CrossOver(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Applies one of the configured mutations.
+  /// Returns the new size of data which could be up to MaxSize.
+  size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Applies one of the configured mutations to the bytes of Data
+  /// that have '1' in Mask.
+  /// Mask.size() should be >= Size.
+  size_t MutateWithMask(uint8_t *Data, size_t Size, size_t MaxSize,
+                        const Vector<uint8_t> &Mask);
+
+  /// Applies one of the default mutations. Provided as a service
+  /// to mutation authors.
+  size_t DefaultMutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Creates a cross-over of two pieces of Data, returns its size.
+  size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
+                   size_t Size2, uint8_t *Out, size_t MaxOutSize);
+
+  void AddWordToManualDictionary(const Word &W);
+
+  void PrintRecommendedDictionary();
+
+  void SetCrossOverWith(const Unit *U) { CrossOverWith = U; }
+
+  Random &GetRand() { return Rand; }
+
+ private:
+  struct Mutator {
+    size_t (MutationDispatcher::*Fn)(uint8_t *Data, size_t Size, size_t Max);
+    const char *Name;
+  };
+
+  size_t AddWordFromDictionary(Dictionary &D, uint8_t *Data, size_t Size,
+                               size_t MaxSize);
+  size_t MutateImpl(uint8_t *Data, size_t Size, size_t MaxSize,
+                    Vector<Mutator> &Mutators);
+
+  size_t InsertPartOf(const uint8_t *From, size_t FromSize, uint8_t *To,
+                      size_t ToSize, size_t MaxToSize);
+  size_t CopyPartOf(const uint8_t *From, size_t FromSize, uint8_t *To,
+                    size_t ToSize);
+  size_t ApplyDictionaryEntry(uint8_t *Data, size_t Size, size_t MaxSize,
+                              DictionaryEntry &DE);
+
+  template <class T>
+  DictionaryEntry MakeDictionaryEntryFromCMP(T Arg1, T Arg2,
+                                             const uint8_t *Data, size_t Size);
+  DictionaryEntry MakeDictionaryEntryFromCMP(const Word &Arg1, const Word &Arg2,
+                                             const uint8_t *Data, size_t Size);
+  DictionaryEntry MakeDictionaryEntryFromCMP(const void *Arg1, const void *Arg2,
+                                             const void *Arg1Mutation,
+                                             const void *Arg2Mutation,
+                                             size_t ArgSize,
+                                             const uint8_t *Data, size_t Size);
+
+  Random &Rand;
+  const FuzzingOptions Options;
+
+  // Dictionary provided by the user via -dict=DICT_FILE.
+  Dictionary ManualDictionary;
+  // Temporary dictionary modified by the fuzzer itself,
+  // recreated periodically.
+  Dictionary TempAutoDictionary;
+  // Persistent dictionary modified by the fuzzer, consists of
+  // entries that led to successful discoveries in the past mutations.
+  Dictionary PersistentAutoDictionary;
+
+  Vector<DictionaryEntry *> CurrentDictionaryEntrySequence;
+
+  static const size_t kCmpDictionaryEntriesDequeSize = 16;
+  DictionaryEntry CmpDictionaryEntriesDeque[kCmpDictionaryEntriesDequeSize];
+  size_t CmpDictionaryEntriesDequeIdx = 0;
+
+  const Unit *CrossOverWith = nullptr;
+  Vector<uint8_t> MutateInPlaceHere;
+  Vector<uint8_t> MutateWithMaskTemp;
+  // CustomCrossOver needs its own buffer as a custom implementation may call
+  // LLVMFuzzerMutate, which in turn may resize MutateInPlaceHere.
+  Vector<uint8_t> CustomCrossOverInPlaceHere;
+
+  Vector<Mutator> Mutators;
+  Vector<Mutator> DefaultMutators;
+  Vector<Mutator> CurrentMutatorSequence;
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_MUTATE_H
diff --git a/custom_mutators/libfuzzer/FuzzerOptions.h b/custom_mutators/libfuzzer/FuzzerOptions.h
new file mode 100644
index 00000000..706e1c64
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerOptions.h
@@ -0,0 +1,90 @@
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::FuzzingOptions
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_OPTIONS_H
+#define LLVM_FUZZER_OPTIONS_H
+
+#include "FuzzerDefs.h"
+
+namespace fuzzer {
+
+struct FuzzingOptions {
+  int Verbosity = 1;
+  size_t MaxLen = 0;
+  size_t LenControl = 1000;
+  bool KeepSeed = false;
+  int UnitTimeoutSec = 300;
+  int TimeoutExitCode = 70;
+  int OOMExitCode = 71;
+  int InterruptExitCode = 72;
+  int ErrorExitCode = 77;
+  bool IgnoreTimeouts = true;
+  bool IgnoreOOMs = true;
+  bool IgnoreCrashes = false;
+  int MaxTotalTimeSec = 0;
+  int RssLimitMb = 0;
+  int MallocLimitMb = 0;
+  bool DoCrossOver = true;
+  bool CrossOverUniformDist = false;
+  int MutateDepth = 5;
+  bool ReduceDepth = false;
+  bool UseCounters = false;
+  bool UseMemmem = true;
+  bool UseCmp = false;
+  int UseValueProfile = false;
+  bool Shrink = false;
+  bool ReduceInputs = false;
+  int ReloadIntervalSec = 1;
+  bool ShuffleAtStartUp = true;
+  bool PreferSmall = true;
+  size_t MaxNumberOfRuns = -1L;
+  int ReportSlowUnits = 10;
+  bool OnlyASCII = false;
+  bool Entropic = false;
+  size_t EntropicFeatureFrequencyThreshold = 0xFF;
+  size_t EntropicNumberOfRarestFeatures = 100;
+  bool EntropicScalePerExecTime = false;
+  std::string OutputCorpus;
+  std::string ArtifactPrefix = "./";
+  std::string ExactArtifactPath;
+  std::string ExitOnSrcPos;
+  std::string ExitOnItem;
+  std::string FocusFunction;
+  std::string DataFlowTrace;
+  std::string CollectDataFlow;
+  std::string FeaturesDir;
+  std::string MutationGraphFile;
+  std::string StopFile;
+  bool SaveArtifacts = true;
+  bool PrintNEW = true; // Print a status line when new units are found;
+  bool PrintNewCovPcs = false;
+  int PrintNewCovFuncs = 0;
+  bool PrintFinalStats = false;
+  bool PrintCorpusStats = false;
+  bool PrintCoverage = false;
+  bool DumpCoverage = false;
+  bool DetectLeaks = true;
+  int PurgeAllocatorIntervalSec = 1;
+  int  TraceMalloc = 0;
+  bool HandleAbrt = false;
+  bool HandleAlrm = false;
+  bool HandleBus = false;
+  bool HandleFpe = false;
+  bool HandleIll = false;
+  bool HandleInt = false;
+  bool HandleSegv = false;
+  bool HandleTerm = false;
+  bool HandleXfsz = false;
+  bool HandleUsr1 = false;
+  bool HandleUsr2 = false;
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_OPTIONS_H
diff --git a/custom_mutators/libfuzzer/FuzzerPlatform.h b/custom_mutators/libfuzzer/FuzzerPlatform.h
new file mode 100644
index 00000000..8befdb88
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerPlatform.h
@@ -0,0 +1,163 @@
+//===-- FuzzerPlatform.h --------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Common platform macros.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_PLATFORM_H
+#define LLVM_FUZZER_PLATFORM_H
+
+// Platform detection.
+#ifdef __linux__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 1
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __APPLE__
+#define LIBFUZZER_APPLE 1
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __NetBSD__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 1
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __FreeBSD__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 1
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __OpenBSD__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 1
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif _WIN32
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 1
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __Fuchsia__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 1
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 0
+#elif __EMSCRIPTEN__
+#define LIBFUZZER_APPLE 0
+#define LIBFUZZER_FUCHSIA 0
+#define LIBFUZZER_LINUX 0
+#define LIBFUZZER_NETBSD 0
+#define LIBFUZZER_FREEBSD 0
+#define LIBFUZZER_OPENBSD 0
+#define LIBFUZZER_WINDOWS 0
+#define LIBFUZZER_EMSCRIPTEN 1
+#else
+#error "Support for your platform has not been implemented"
+#endif
+
+#if defined(_MSC_VER) && !defined(__clang__)
+// MSVC compiler is being used.
+#define LIBFUZZER_MSVC 1
+#else
+#define LIBFUZZER_MSVC 0
+#endif
+
+#ifndef __has_attribute
+#define __has_attribute(x) 0
+#endif
+
+#define LIBFUZZER_POSIX                                                        \
+  (LIBFUZZER_APPLE || LIBFUZZER_LINUX || LIBFUZZER_NETBSD ||                   \
+   LIBFUZZER_FREEBSD || LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN)
+
+#ifdef __x86_64
+#if __has_attribute(target)
+#define ATTRIBUTE_TARGET_POPCNT __attribute__((target("popcnt")))
+#else
+#define ATTRIBUTE_TARGET_POPCNT
+#endif
+#else
+#define ATTRIBUTE_TARGET_POPCNT
+#endif
+
+#ifdef __clang__ // avoid gcc warning.
+#if __has_attribute(no_sanitize)
+#define ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize("memory")))
+#else
+#define ATTRIBUTE_NO_SANITIZE_MEMORY
+#endif
+#define ALWAYS_INLINE __attribute__((always_inline))
+#else
+#define ATTRIBUTE_NO_SANITIZE_MEMORY
+#define ALWAYS_INLINE
+#endif // __clang__
+
+#if LIBFUZZER_WINDOWS
+#define ATTRIBUTE_NO_SANITIZE_ADDRESS
+#else
+#define ATTRIBUTE_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
+#endif
+
+#if LIBFUZZER_WINDOWS
+#define ATTRIBUTE_ALIGNED(X) __declspec(align(X))
+#define ATTRIBUTE_INTERFACE __declspec(dllexport)
+// This is used for __sancov_lowest_stack which is needed for
+// -fsanitize-coverage=stack-depth. That feature is not yet available on
+// Windows, so make the symbol static to avoid linking errors.
+#define ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC static
+#define ATTRIBUTE_NOINLINE __declspec(noinline)
+#else
+#define ATTRIBUTE_ALIGNED(X) __attribute__((aligned(X)))
+#define ATTRIBUTE_INTERFACE __attribute__((visibility("default")))
+#define ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC                                  \
+  ATTRIBUTE_INTERFACE __attribute__((tls_model("initial-exec"))) thread_local
+
+#define ATTRIBUTE_NOINLINE __attribute__((noinline))
+#endif
+
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+#define ATTRIBUTE_NO_SANITIZE_ALL ATTRIBUTE_NO_SANITIZE_ADDRESS
+#elif __has_feature(memory_sanitizer)
+#define ATTRIBUTE_NO_SANITIZE_ALL ATTRIBUTE_NO_SANITIZE_MEMORY
+#else
+#define ATTRIBUTE_NO_SANITIZE_ALL
+#endif
+#else
+#define ATTRIBUTE_NO_SANITIZE_ALL
+#endif
+
+#endif // LLVM_FUZZER_PLATFORM_H
diff --git a/custom_mutators/libfuzzer/FuzzerRandom.h b/custom_mutators/libfuzzer/FuzzerRandom.h
new file mode 100644
index 00000000..659283ee
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerRandom.h
@@ -0,0 +1,38 @@
+//===- FuzzerRandom.h - Internal header for the Fuzzer ----------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::Random
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_RANDOM_H
+#define LLVM_FUZZER_RANDOM_H
+
+#include <random>
+
+namespace fuzzer {
+class Random : public std::minstd_rand {
+ public:
+  Random(unsigned int seed) : std::minstd_rand(seed) {}
+  result_type operator()() { return this->std::minstd_rand::operator()(); }
+  size_t Rand() { return this->operator()(); }
+  size_t RandBool() { return Rand() % 2; }
+  size_t SkewTowardsLast(size_t n) {
+    size_t T = this->operator()(n * n);
+    size_t Res = sqrt(T);
+    return Res;
+  }
+  size_t operator()(size_t n) { return n ? Rand() % n : 0; }
+  intptr_t operator()(intptr_t From, intptr_t To) {
+    assert(From < To);
+    intptr_t RangeSize = To - From + 1;
+    return operator()(RangeSize) + From;
+  }
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_RANDOM_H
diff --git a/custom_mutators/libfuzzer/FuzzerSHA1.cpp b/custom_mutators/libfuzzer/FuzzerSHA1.cpp
new file mode 100644
index 00000000..0a58b661
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerSHA1.cpp
@@ -0,0 +1,269 @@
+//===- FuzzerSHA1.h - Private copy of the SHA1 implementation ---*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This code is taken from public domain
+// (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c)
+// and modified by adding anonymous namespace, adding an interface
+// function fuzzer::ComputeSHA1() and removing unnecessary code.
+//
+// lib/Fuzzer can not use SHA1 implementation from openssl because
+// openssl may not be available and because we may be fuzzing openssl itself.
+// For the same reason we do not want to depend on SHA1 from LLVM tree.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerSHA1.h"
+#include "FuzzerDefs.h"
+#include "FuzzerPlatform.h"
+
+/* This code is public-domain - it is based on libcrypt
+ * placed in the public domain by Wei Dai and other contributors.
+ */
+
+#include <iomanip>
+#include <sstream>
+#include <stdint.h>
+#include <string.h>
+
+namespace {  // Added for LibFuzzer
+
+#ifdef __BIG_ENDIAN__
+  #define SHA_BIG_ENDIAN
+// Windows is always little endian and MSVC doesn't have <endian.h>
+#elif defined __LITTLE_ENDIAN__ || LIBFUZZER_WINDOWS
+/* override */
+#elif defined __BYTE_ORDER
+  #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+    #define SHA_BIG_ENDIAN
+  #endif
+#else                  // ! defined __LITTLE_ENDIAN__
+  #include <endian.h>  // machine/endian.h
+  #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+    #define SHA_BIG_ENDIAN
+  #endif
+#endif
+
+/* header */
+
+#define HASH_LENGTH 20
+#define BLOCK_LENGTH 64
+
+typedef struct sha1nfo {
+
+  uint32_t buffer[BLOCK_LENGTH / 4];
+  uint32_t state[HASH_LENGTH / 4];
+  uint32_t byteCount;
+  uint8_t  bufferOffset;
+  uint8_t  keyBuffer[BLOCK_LENGTH];
+  uint8_t  innerHash[HASH_LENGTH];
+
+} sha1nfo;
+
+/* public API - prototypes - TODO: doxygen*/
+
+/**
+ */
+void sha1_init(sha1nfo *s);
+/**
+ */
+void sha1_writebyte(sha1nfo *s, uint8_t data);
+/**
+ */
+void sha1_write(sha1nfo *s, const char *data, size_t len);
+/**
+ */
+uint8_t *sha1_result(sha1nfo *s);
+
+/* code */
+#define SHA1_K0 0x5a827999
+#define SHA1_K20 0x6ed9eba1
+#define SHA1_K40 0x8f1bbcdc
+#define SHA1_K60 0xca62c1d6
+
+void sha1_init(sha1nfo *s) {
+
+  s->state[0] = 0x67452301;
+  s->state[1] = 0xefcdab89;
+  s->state[2] = 0x98badcfe;
+  s->state[3] = 0x10325476;
+  s->state[4] = 0xc3d2e1f0;
+  s->byteCount = 0;
+  s->bufferOffset = 0;
+
+}
+
+uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
+
+  return ((number << bits) | (number >> (32 - bits)));
+
+}
+
+void sha1_hashBlock(sha1nfo *s) {
+
+  uint8_t  i;
+  uint32_t a, b, c, d, e, t;
+
+  a = s->state[0];
+  b = s->state[1];
+  c = s->state[2];
+  d = s->state[3];
+  e = s->state[4];
+  for (i = 0; i < 80; i++) {
+
+    if (i >= 16) {
+
+      t = s->buffer[(i + 13) & 15] ^ s->buffer[(i + 8) & 15] ^
+          s->buffer[(i + 2) & 15] ^ s->buffer[i & 15];
+      s->buffer[i & 15] = sha1_rol32(t, 1);
+
+    }
+
+    if (i < 20) {
+
+      t = (d ^ (b & (c ^ d))) + SHA1_K0;
+
+    } else if (i < 40) {
+
+      t = (b ^ c ^ d) + SHA1_K20;
+
+    } else if (i < 60) {
+
+      t = ((b & c) | (d & (b | c))) + SHA1_K40;
+
+    } else {
+
+      t = (b ^ c ^ d) + SHA1_K60;
+
+    }
+
+    t += sha1_rol32(a, 5) + e + s->buffer[i & 15];
+    e = d;
+    d = c;
+    c = sha1_rol32(b, 30);
+    b = a;
+    a = t;
+
+  }
+
+  s->state[0] += a;
+  s->state[1] += b;
+  s->state[2] += c;
+  s->state[3] += d;
+  s->state[4] += e;
+
+}
+
+void sha1_addUncounted(sha1nfo *s, uint8_t data) {
+
+  uint8_t *const b = (uint8_t *)s->buffer;
+#ifdef SHA_BIG_ENDIAN
+  b[s->bufferOffset] = data;
+#else
+  b[s->bufferOffset ^ 3] = data;
+#endif
+  s->bufferOffset++;
+  if (s->bufferOffset == BLOCK_LENGTH) {
+
+    sha1_hashBlock(s);
+    s->bufferOffset = 0;
+
+  }
+
+}
+
+void sha1_writebyte(sha1nfo *s, uint8_t data) {
+
+  ++s->byteCount;
+  sha1_addUncounted(s, data);
+
+}
+
+void sha1_write(sha1nfo *s, const char *data, size_t len) {
+
+  for (; len--;)
+    sha1_writebyte(s, (uint8_t)*data++);
+
+}
+
+void sha1_pad(sha1nfo *s) {
+
+  // Implement SHA-1 padding (fips180-2 §5.1.1)
+
+  // Pad with 0x80 followed by 0x00 until the end of the block
+  sha1_addUncounted(s, 0x80);
+  while (s->bufferOffset != 56)
+    sha1_addUncounted(s, 0x00);
+
+  // Append length in the last 8 bytes
+  sha1_addUncounted(s, 0);  // We're only using 32 bit lengths
+  sha1_addUncounted(s, 0);  // But SHA-1 supports 64 bit lengths
+  sha1_addUncounted(s, 0);  // So zero pad the top bits
+  sha1_addUncounted(s, s->byteCount >> 29);  // Shifting to multiply by 8
+  sha1_addUncounted(
+      s, s->byteCount >> 21);  // as SHA-1 supports bitstreams as well as
+  sha1_addUncounted(s, s->byteCount >> 13);  // byte.
+  sha1_addUncounted(s, s->byteCount >> 5);
+  sha1_addUncounted(s, s->byteCount << 3);
+
+}
+
+uint8_t *sha1_result(sha1nfo *s) {
+
+  // Pad to complete the last block
+  sha1_pad(s);
+
+#ifndef SHA_BIG_ENDIAN
+  // Swap byte order back
+  int i;
+  for (i = 0; i < 5; i++) {
+
+    s->state[i] = (((s->state[i]) << 24) & 0xff000000) |
+                  (((s->state[i]) << 8) & 0x00ff0000) |
+                  (((s->state[i]) >> 8) & 0x0000ff00) |
+                  (((s->state[i]) >> 24) & 0x000000ff);
+
+  }
+
+#endif
+
+  // Return pointer to hash (20 characters)
+  return (uint8_t *)s->state;
+
+}
+
+}  // namespace
+
+namespace fuzzer {
+
+// The rest is added for LibFuzzer
+void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out) {
+
+  sha1nfo s;
+  sha1_init(&s);
+  sha1_write(&s, (const char *)Data, Len);
+  memcpy(Out, sha1_result(&s), HASH_LENGTH);
+
+}
+
+std::string Sha1ToString(const uint8_t Sha1[kSHA1NumBytes]) {
+
+  std::stringstream SS;
+  for (int i = 0; i < kSHA1NumBytes; i++)
+    SS << std::hex << std::setfill('0') << std::setw(2) << (unsigned)Sha1[i];
+  return SS.str();
+
+}
+
+std::string Hash(const Unit &U) {
+
+  uint8_t Hash[kSHA1NumBytes];
+  ComputeSHA1(U.data(), U.size(), Hash);
+  return Sha1ToString(Hash);
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerSHA1.h b/custom_mutators/libfuzzer/FuzzerSHA1.h
new file mode 100644
index 00000000..05cbacda
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerSHA1.h
@@ -0,0 +1,32 @@
+//===- FuzzerSHA1.h - Internal header for the SHA1 utils --------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// SHA1 utils.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_SHA1_H
+#define LLVM_FUZZER_SHA1_H
+
+#include "FuzzerDefs.h"
+#include <cstddef>
+#include <stdint.h>
+
+namespace fuzzer {
+
+// Private copy of SHA1 implementation.
+static const int kSHA1NumBytes = 20;
+
+// Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
+void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
+
+std::string Sha1ToString(const uint8_t Sha1[kSHA1NumBytes]);
+
+std::string Hash(const Unit &U);
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_SHA1_H
diff --git a/custom_mutators/libfuzzer/FuzzerTracePC.cpp b/custom_mutators/libfuzzer/FuzzerTracePC.cpp
new file mode 100644
index 00000000..1177325e
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerTracePC.cpp
@@ -0,0 +1,819 @@
+//===- FuzzerTracePC.cpp - PC tracing--------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Trace PCs.
+// This module implements __sanitizer_cov_trace_pc_guard[_init],
+// the callback required for -fsanitize-coverage=trace-pc-guard instrumentation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerTracePC.h"
+#include "FuzzerBuiltins.h"
+#include "FuzzerBuiltinsMsvc.h"
+#include "FuzzerCorpus.h"
+#include "FuzzerDefs.h"
+#include "FuzzerDictionary.h"
+#include "FuzzerExtFunctions.h"
+#include "FuzzerIO.h"
+#include "FuzzerPlatform.h"
+#include "FuzzerUtil.h"
+#include "FuzzerValueBitMap.h"
+#include <set>
+
+// Used by -fsanitize-coverage=stack-depth to track stack depth
+ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC uintptr_t __sancov_lowest_stack;
+
+namespace fuzzer {
+
+TracePC TPC;
+
+size_t TracePC::GetTotalPCCoverage() {
+
+  return ObservedPCs.size();
+
+}
+
+void TracePC::HandleInline8bitCountersInit(uint8_t *Start, uint8_t *Stop) {
+
+  if (Start == Stop) return;
+  if (NumModules && Modules[NumModules - 1].Start() == Start) return;
+  assert(NumModules < sizeof(Modules) / sizeof(Modules[0]));
+  auto &   M = Modules[NumModules++];
+  uint8_t *AlignedStart = RoundUpByPage(Start);
+  uint8_t *AlignedStop = RoundDownByPage(Stop);
+  size_t   NumFullPages = AlignedStop > AlignedStart
+                            ? (AlignedStop - AlignedStart) / PageSize()
+                            : 0;
+  bool NeedFirst = Start < AlignedStart || !NumFullPages;
+  bool NeedLast = Stop > AlignedStop && AlignedStop >= AlignedStart;
+  M.NumRegions = NumFullPages + NeedFirst + NeedLast;
+  ;
+  assert(M.NumRegions > 0);
+  M.Regions = new Module::Region[M.NumRegions];
+  assert(M.Regions);
+  size_t R = 0;
+  if (NeedFirst)
+    M.Regions[R++] = {Start, std::min(Stop, AlignedStart), true, false};
+  for (uint8_t *P = AlignedStart; P < AlignedStop; P += PageSize())
+    M.Regions[R++] = {P, P + PageSize(), true, true};
+  if (NeedLast) M.Regions[R++] = {AlignedStop, Stop, true, false};
+  assert(R == M.NumRegions);
+  assert(M.Size() == (size_t)(Stop - Start));
+  assert(M.Stop() == Stop);
+  assert(M.Start() == Start);
+  NumInline8bitCounters += M.Size();
+
+}
+
+void TracePC::HandlePCsInit(const uintptr_t *Start, const uintptr_t *Stop) {
+
+  const PCTableEntry *B = reinterpret_cast<const PCTableEntry *>(Start);
+  const PCTableEntry *E = reinterpret_cast<const PCTableEntry *>(Stop);
+  if (NumPCTables && ModulePCTable[NumPCTables - 1].Start == B) return;
+  assert(NumPCTables < sizeof(ModulePCTable) / sizeof(ModulePCTable[0]));
+  ModulePCTable[NumPCTables++] = {B, E};
+  NumPCsInPCTables += E - B;
+
+}
+
+void TracePC::PrintModuleInfo() {
+
+  if (NumModules) {
+
+    Printf("INFO: Loaded %zd modules   (%zd inline 8-bit counters): ",
+           NumModules, NumInline8bitCounters);
+    for (size_t i = 0; i < NumModules; i++)
+      Printf("%zd [%p, %p), ", Modules[i].Size(), Modules[i].Start(),
+             Modules[i].Stop());
+    Printf("\n");
+
+  }
+
+  if (NumPCTables) {
+
+    Printf("INFO: Loaded %zd PC tables (%zd PCs): ", NumPCTables,
+           NumPCsInPCTables);
+    for (size_t i = 0; i < NumPCTables; i++) {
+
+      Printf("%zd [%p,%p), ", ModulePCTable[i].Stop - ModulePCTable[i].Start,
+             ModulePCTable[i].Start, ModulePCTable[i].Stop);
+
+    }
+
+    Printf("\n");
+
+    if (NumInline8bitCounters && NumInline8bitCounters != NumPCsInPCTables) {
+
+      Printf(
+          "ERROR: The size of coverage PC tables does not match the\n"
+          "number of instrumented PCs. This might be a compiler bug,\n"
+          "please contact the libFuzzer developers.\n"
+          "Also check https://bugs.llvm.org/show_bug.cgi?id=34636\n"
+          "for possible workarounds (tl;dr: don't use the old GNU ld)\n");
+      _Exit(1);
+
+    }
+
+  }
+
+  if (size_t NumExtraCounters = ExtraCountersEnd() - ExtraCountersBegin())
+    Printf("INFO: %zd Extra Counters\n", NumExtraCounters);
+
+}
+
+ATTRIBUTE_NO_SANITIZE_ALL
+void TracePC::HandleCallerCallee(uintptr_t Caller, uintptr_t Callee) {
+
+  const uintptr_t kBits = 12;
+  const uintptr_t kMask = (1 << kBits) - 1;
+  uintptr_t       Idx = (Caller & kMask) | ((Callee & kMask) << kBits);
+  ValueProfileMap.AddValueModPrime(Idx);
+
+}
+
+/// \return the address of the previous instruction.
+/// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.h`
+inline ALWAYS_INLINE uintptr_t GetPreviousInstructionPc(uintptr_t PC) {
+
+#if defined(__arm__)
+  // T32 (Thumb) branch instructions might be 16 or 32 bit long,
+  // so we return (pc-2) in that case in order to be safe.
+  // For A32 mode we return (pc-4) because all instructions are 32 bit long.
+  return (PC - 3) & (~1);
+#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__aarch64__)
+  // PCs are always 4 byte aligned.
+  return PC - 4;
+#elif defined(__sparc__) || defined(__mips__)
+  return PC - 8;
+#else
+  return PC - 1;
+#endif
+
+}
+
+/// \return the address of the next instruction.
+/// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.cpp`
+ALWAYS_INLINE uintptr_t TracePC::GetNextInstructionPc(uintptr_t PC) {
+
+#if defined(__mips__)
+  return PC + 8;
+#elif defined(__powerpc__) || defined(__sparc__) || defined(__arm__) || \
+    defined(__aarch64__)
+  return PC + 4;
+#else
+  return PC + 1;
+#endif
+
+}
+
+void TracePC::UpdateObservedPCs() {
+
+  Vector<uintptr_t> CoveredFuncs;
+  auto              ObservePC = [&](const PCTableEntry *TE) {
+
+    if (ObservedPCs.insert(TE).second && DoPrintNewPCs) {
+
+      PrintPC("\tNEW_PC: %p %F %L", "\tNEW_PC: %p",
+              GetNextInstructionPc(TE->PC));
+      Printf("\n");
+
+    }
+
+  };
+
+  auto Observe = [&](const PCTableEntry *TE) {
+
+    if (PcIsFuncEntry(TE))
+      if (++ObservedFuncs[TE->PC] == 1 && NumPrintNewFuncs)
+        CoveredFuncs.push_back(TE->PC);
+    ObservePC(TE);
+
+  };
+
+  if (NumPCsInPCTables) {
+
+    if (NumInline8bitCounters == NumPCsInPCTables) {
+
+      for (size_t i = 0; i < NumModules; i++) {
+
+        auto &M = Modules[i];
+        assert(M.Size() ==
+               (size_t)(ModulePCTable[i].Stop - ModulePCTable[i].Start));
+        for (size_t r = 0; r < M.NumRegions; r++) {
+
+          auto &R = M.Regions[r];
+          if (!R.Enabled) continue;
+          for (uint8_t *P = R.Start; P < R.Stop; P++)
+            if (*P) Observe(&ModulePCTable[i].Start[M.Idx(P)]);
+
+        }
+
+      }
+
+    }
+
+  }
+
+  for (size_t i = 0, N = Min(CoveredFuncs.size(), NumPrintNewFuncs); i < N;
+       i++) {
+
+    Printf("\tNEW_FUNC[%zd/%zd]: ", i + 1, CoveredFuncs.size());
+    PrintPC("%p %F %L", "%p", GetNextInstructionPc(CoveredFuncs[i]));
+    Printf("\n");
+
+  }
+
+}
+
+uintptr_t TracePC::PCTableEntryIdx(const PCTableEntry *TE) {
+
+  size_t TotalTEs = 0;
+  for (size_t i = 0; i < NumPCTables; i++) {
+
+    auto &M = ModulePCTable[i];
+    if (TE >= M.Start && TE < M.Stop) return TotalTEs + TE - M.Start;
+    TotalTEs += M.Stop - M.Start;
+
+  }
+
+  assert(0);
+  return 0;
+
+}
+
+const TracePC::PCTableEntry *TracePC::PCTableEntryByIdx(uintptr_t Idx) {
+
+  for (size_t i = 0; i < NumPCTables; i++) {
+
+    auto & M = ModulePCTable[i];
+    size_t Size = M.Stop - M.Start;
+    if (Idx < Size) return &M.Start[Idx];
+    Idx -= Size;
+
+  }
+
+  return nullptr;
+
+}
+
+static std::string GetModuleName(uintptr_t PC) {
+
+  char  ModulePathRaw[4096] = "";  // What's PATH_MAX in portable C++?
+  void *OffsetRaw = nullptr;
+  if (!EF->__sanitizer_get_module_and_offset_for_pc(
+          reinterpret_cast<void *>(PC), ModulePathRaw, sizeof(ModulePathRaw),
+          &OffsetRaw))
+    return "";
+  return ModulePathRaw;
+
+}
+
+template <class CallBack>
+void TracePC::IterateCoveredFunctions(CallBack CB) {
+
+  for (size_t i = 0; i < NumPCTables; i++) {
+
+    auto &M = ModulePCTable[i];
+    assert(M.Start < M.Stop);
+    auto ModuleName = GetModuleName(M.Start->PC);
+    for (auto NextFE = M.Start; NextFE < M.Stop;) {
+
+      auto FE = NextFE;
+      assert(PcIsFuncEntry(FE) && "Not a function entry point");
+      do {
+
+        NextFE++;
+
+      } while (NextFE < M.Stop && !(PcIsFuncEntry(NextFE)));
+
+      CB(FE, NextFE, ObservedFuncs[FE->PC]);
+
+    }
+
+  }
+
+}
+
+void TracePC::SetFocusFunction(const std::string &FuncName) {
+
+  // This function should be called once.
+  assert(!FocusFunctionCounterPtr);
+  // "auto" is not a valid function name. If this function is called with "auto"
+  // that means the auto focus functionality failed.
+  if (FuncName.empty() || FuncName == "auto") return;
+  for (size_t M = 0; M < NumModules; M++) {
+
+    auto & PCTE = ModulePCTable[M];
+    size_t N = PCTE.Stop - PCTE.Start;
+    for (size_t I = 0; I < N; I++) {
+
+      if (!(PcIsFuncEntry(&PCTE.Start[I]))) continue;  // not a function entry.
+      auto Name = DescribePC("%F", GetNextInstructionPc(PCTE.Start[I].PC));
+      if (Name[0] == 'i' && Name[1] == 'n' && Name[2] == ' ')
+        Name = Name.substr(3, std::string::npos);
+      if (FuncName != Name) continue;
+      Printf("INFO: Focus function is set to '%s'\n", Name.c_str());
+      FocusFunctionCounterPtr = Modules[M].Start() + I;
+      return;
+
+    }
+
+  }
+
+  Printf(
+      "ERROR: Failed to set focus function. Make sure the function name is "
+      "valid (%s) and symbolization is enabled.\n",
+      FuncName.c_str());
+  exit(1);
+
+}
+
+bool TracePC::ObservedFocusFunction() {
+
+  return FocusFunctionCounterPtr && *FocusFunctionCounterPtr;
+
+}
+
+void TracePC::PrintCoverage() {
+
+  if (!EF->__sanitizer_symbolize_pc ||
+      !EF->__sanitizer_get_module_and_offset_for_pc) {
+
+    Printf(
+        "INFO: __sanitizer_symbolize_pc or "
+        "__sanitizer_get_module_and_offset_for_pc is not available,"
+        " not printing coverage\n");
+    return;
+
+  }
+
+  Printf("COVERAGE:\n");
+  auto CoveredFunctionCallback = [&](const PCTableEntry *First,
+                                     const PCTableEntry *Last,
+                                     uintptr_t           Counter) {
+
+    assert(First < Last);
+    auto        VisualizePC = GetNextInstructionPc(First->PC);
+    std::string FileStr = DescribePC("%s", VisualizePC);
+    if (!IsInterestingCoverageFile(FileStr)) return;
+    std::string FunctionStr = DescribePC("%F", VisualizePC);
+    if (FunctionStr.find("in ") == 0) FunctionStr = FunctionStr.substr(3);
+    std::string       LineStr = DescribePC("%l", VisualizePC);
+    size_t            NumEdges = Last - First;
+    Vector<uintptr_t> UncoveredPCs;
+    for (auto TE = First; TE < Last; TE++)
+      if (!ObservedPCs.count(TE)) UncoveredPCs.push_back(TE->PC);
+    Printf("%sCOVERED_FUNC: hits: %zd", Counter ? "" : "UN", Counter);
+    Printf(" edges: %zd/%zd", NumEdges - UncoveredPCs.size(), NumEdges);
+    Printf(" %s %s:%s\n", FunctionStr.c_str(), FileStr.c_str(),
+           LineStr.c_str());
+    if (Counter)
+      for (auto PC : UncoveredPCs)
+        Printf("  UNCOVERED_PC: %s\n",
+               DescribePC("%s:%l", GetNextInstructionPc(PC)).c_str());
+
+  };
+
+  IterateCoveredFunctions(CoveredFunctionCallback);
+
+}
+
+// Value profile.
+// We keep track of various values that affect control flow.
+// These values are inserted into a bit-set-based hash map.
+// Every new bit in the map is treated as a new coverage.
+//
+// For memcmp/strcmp/etc the interesting value is the length of the common
+// prefix of the parameters.
+// For cmp instructions the interesting value is a XOR of the parameters.
+// The interesting value is mixed up with the PC and is then added to the map.
+
+ATTRIBUTE_NO_SANITIZE_ALL
+void TracePC::AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2,
+                                size_t n, bool StopAtZero) {
+
+  if (!n) return;
+  size_t         Len = std::min(n, Word::GetMaxSize());
+  const uint8_t *A1 = reinterpret_cast<const uint8_t *>(s1);
+  const uint8_t *A2 = reinterpret_cast<const uint8_t *>(s2);
+  uint8_t        B1[Word::kMaxSize];
+  uint8_t        B2[Word::kMaxSize];
+  // Copy the data into locals in this non-msan-instrumented function
+  // to avoid msan complaining further.
+  size_t Hash = 0;  // Compute some simple hash of both strings.
+  for (size_t i = 0; i < Len; i++) {
+
+    B1[i] = A1[i];
+    B2[i] = A2[i];
+    size_t T = B1[i];
+    Hash ^= (T << 8) | B2[i];
+
+  }
+
+  size_t  I = 0;
+  uint8_t HammingDistance = 0;
+  for (; I < Len; I++) {
+
+    if (B1[I] != B2[I] || (StopAtZero && B1[I] == 0)) {
+
+      HammingDistance = Popcountll(B1[I] ^ B2[I]);
+      break;
+
+    }
+
+  }
+
+  size_t PC = reinterpret_cast<size_t>(caller_pc);
+  size_t Idx = (PC & 4095) | (I << 12);
+  Idx += HammingDistance;
+  ValueProfileMap.AddValue(Idx);
+  TORCW.Insert(Idx ^ Hash, Word(B1, Len), Word(B2, Len));
+
+}
+
+template <class T>
+ATTRIBUTE_TARGET_POPCNT ALWAYS_INLINE ATTRIBUTE_NO_SANITIZE_ALL void
+TracePC::HandleCmp(uintptr_t PC, T Arg1, T Arg2) {
+
+  uint64_t ArgXor = Arg1 ^ Arg2;
+  if (sizeof(T) == 4)
+    TORC4.Insert(ArgXor, Arg1, Arg2);
+  else if (sizeof(T) == 8)
+    TORC8.Insert(ArgXor, Arg1, Arg2);
+  uint64_t HammingDistance = Popcountll(ArgXor);  // [0,64]
+  uint64_t AbsoluteDistance = (Arg1 == Arg2 ? 0 : Clzll(Arg1 - Arg2) + 1);
+  ValueProfileMap.AddValue(PC * 128 + HammingDistance);
+  ValueProfileMap.AddValue(PC * 128 + 64 + AbsoluteDistance);
+
+}
+
+static size_t InternalStrnlen(const char *S, size_t MaxLen) {
+
+  size_t Len = 0;
+  for (; Len < MaxLen && S[Len]; Len++) {}
+  return Len;
+
+}
+
+// Finds min of (strlen(S1), strlen(S2)).
+// Needed bacause one of these strings may actually be non-zero terminated.
+static size_t InternalStrnlen2(const char *S1, const char *S2) {
+
+  size_t Len = 0;
+  for (; S1[Len] && S2[Len]; Len++) {}
+  return Len;
+
+}
+
+void TracePC::ClearInlineCounters() {
+
+  IterateCounterRegions([](const Module::Region &R) {
+
+    if (R.Enabled) memset(R.Start, 0, R.Stop - R.Start);
+
+  });
+
+}
+
+ATTRIBUTE_NO_SANITIZE_ALL
+void TracePC::RecordInitialStack() {
+
+  int stack;
+  __sancov_lowest_stack = InitialStack = reinterpret_cast<uintptr_t>(&stack);
+
+}
+
+uintptr_t TracePC::GetMaxStackOffset() const {
+
+  return InitialStack - __sancov_lowest_stack;  // Stack grows down
+
+}
+
+void WarnAboutDeprecatedInstrumentation(const char *flag) {
+
+  // Use RawPrint because Printf cannot be used on Windows before OutputFile is
+  // initialized.
+  RawPrint(flag);
+  RawPrint(
+      " is no longer supported by libFuzzer.\n"
+      "Please either migrate to a compiler that supports -fsanitize=fuzzer\n"
+      "or use an older version of libFuzzer\n");
+  exit(1);
+
+}
+
+}  // namespace fuzzer
+
+extern "C" {
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+void __sanitizer_cov_trace_pc_guard(uint32_t *Guard) {
+
+  fuzzer::WarnAboutDeprecatedInstrumentation(
+      "-fsanitize-coverage=trace-pc-guard");
+
+}
+
+// Best-effort support for -fsanitize-coverage=trace-pc, which is available
+// in both Clang and GCC.
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+void __sanitizer_cov_trace_pc() {
+
+  fuzzer::WarnAboutDeprecatedInstrumentation("-fsanitize-coverage=trace-pc");
+
+}
+
+ATTRIBUTE_INTERFACE
+void __sanitizer_cov_trace_pc_guard_init(uint32_t *Start, uint32_t *Stop) {
+
+  fuzzer::WarnAboutDeprecatedInstrumentation(
+      "-fsanitize-coverage=trace-pc-guard");
+
+}
+
+ATTRIBUTE_INTERFACE
+void __sanitizer_cov_8bit_counters_init(uint8_t *Start, uint8_t *Stop) {
+
+  fuzzer::TPC.HandleInline8bitCountersInit(Start, Stop);
+
+}
+
+ATTRIBUTE_INTERFACE
+void __sanitizer_cov_pcs_init(const uintptr_t *pcs_beg,
+                              const uintptr_t *pcs_end) {
+
+  fuzzer::TPC.HandlePCsInit(pcs_beg, pcs_end);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+void __sanitizer_cov_trace_pc_indir(uintptr_t Callee) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCallerCallee(PC, Callee);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_cmp8(uint64_t Arg1, uint64_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+// Now the __sanitizer_cov_trace_const_cmp[1248] callbacks just mimic
+// the behaviour of __sanitizer_cov_trace_cmp[1248] ones. This, however,
+// should be changed later to make full use of instrumentation.
+void __sanitizer_cov_trace_const_cmp8(uint64_t Arg1, uint64_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_cmp4(uint32_t Arg1, uint32_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_const_cmp4(uint32_t Arg1, uint32_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_cmp2(uint16_t Arg1, uint16_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_const_cmp2(uint16_t Arg1, uint16_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_cmp1(uint8_t Arg1, uint8_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_const_cmp1(uint8_t Arg1, uint8_t Arg2) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Arg1, Arg2);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases) {
+
+  uint64_t  N = Cases[0];
+  uint64_t  ValSizeInBits = Cases[1];
+  uint64_t *Vals = Cases + 2;
+  // Skip the most common and the most boring case: all switch values are small.
+  // We may want to skip this at compile-time, but it will make the
+  // instrumentation less general.
+  if (Vals[N - 1] < 256) return;
+  // Also skip small inputs values, they won't give good signal.
+  if (Val < 256) return;
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  size_t    i;
+  uint64_t  Smaller = 0;
+  uint64_t  Larger = ~(uint64_t)0;
+  // Find two switch values such that Smaller < Val < Larger.
+  // Use 0 and 0xfff..f as the defaults.
+  for (i = 0; i < N; i++) {
+
+    if (Val < Vals[i]) {
+
+      Larger = Vals[i];
+      break;
+
+    }
+
+    if (Val > Vals[i]) Smaller = Vals[i];
+
+  }
+
+  // Apply HandleCmp to {Val,Smaller} and {Val, Larger},
+  // use i as the PC modifier for HandleCmp.
+  if (ValSizeInBits == 16) {
+
+    fuzzer::TPC.HandleCmp(PC + 2 * i, static_cast<uint16_t>(Val),
+                          (uint16_t)(Smaller));
+    fuzzer::TPC.HandleCmp(PC + 2 * i + 1, static_cast<uint16_t>(Val),
+                          (uint16_t)(Larger));
+
+  } else if (ValSizeInBits == 32) {
+
+    fuzzer::TPC.HandleCmp(PC + 2 * i, static_cast<uint32_t>(Val),
+                          (uint32_t)(Smaller));
+    fuzzer::TPC.HandleCmp(PC + 2 * i + 1, static_cast<uint32_t>(Val),
+                          (uint32_t)(Larger));
+
+  } else {
+
+    fuzzer::TPC.HandleCmp(PC + 2 * i, Val, Smaller);
+    fuzzer::TPC.HandleCmp(PC + 2 * i + 1, Val, Larger);
+
+  }
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_div4(uint32_t Val) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Val, (uint32_t)0);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_div8(uint64_t Val) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Val, (uint64_t)0);
+
+}
+
+ATTRIBUTE_INTERFACE
+ATTRIBUTE_NO_SANITIZE_ALL
+ATTRIBUTE_TARGET_POPCNT
+void __sanitizer_cov_trace_gep(uintptr_t Idx) {
+
+  uintptr_t PC = reinterpret_cast<uintptr_t>(GET_CALLER_PC());
+  fuzzer::TPC.HandleCmp(PC, Idx, (uintptr_t)0);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_memcmp(void *caller_pc, const void *s1, const void *s2,
+                             size_t n, int result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  if (result == 0) return;  // No reason to mutate.
+  if (n <= 1) return;       // Not interesting.
+  fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, n, /*StopAtZero*/ false);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strncmp(void *caller_pc, const char *s1, const char *s2,
+                              size_t n, int result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  if (result == 0) return;  // No reason to mutate.
+  size_t Len1 = fuzzer::InternalStrnlen(s1, n);
+  size_t Len2 = fuzzer::InternalStrnlen(s2, n);
+  n = std::min(n, Len1);
+  n = std::min(n, Len2);
+  if (n <= 1) return;  // Not interesting.
+  fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, n, /*StopAtZero*/ true);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strcmp(void *caller_pc, const char *s1, const char *s2,
+                             int result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  if (result == 0) return;  // No reason to mutate.
+  size_t N = fuzzer::InternalStrnlen2(s1, s2);
+  if (N <= 1) return;  // Not interesting.
+  fuzzer::TPC.AddValueForMemcmp(caller_pc, s1, s2, N, /*StopAtZero*/ true);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
+                                  const char *s2, size_t n, int result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  return __sanitizer_weak_hook_strncmp(called_pc, s1, s2, n, result);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
+                                 const char *s2, int result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  return __sanitizer_weak_hook_strcmp(called_pc, s1, s2, result);
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strstr(void *called_pc, const char *s1, const char *s2,
+                             char *result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), strlen(s2));
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1,
+                                 const char *s2, char *result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), strlen(s2));
+
+}
+
+ATTRIBUTE_INTERFACE ATTRIBUTE_NO_SANITIZE_MEMORY void
+__sanitizer_weak_hook_memmem(void *called_pc, const void *s1, size_t len1,
+                             const void *s2, size_t len2, void *result) {
+
+  if (!fuzzer::RunningUserCallback) return;
+  fuzzer::TPC.MMT.Add(reinterpret_cast<const uint8_t *>(s2), len2);
+
+}
+
+}  // extern "C"
+
diff --git a/custom_mutators/libfuzzer/FuzzerTracePC.h b/custom_mutators/libfuzzer/FuzzerTracePC.h
new file mode 100644
index 00000000..4601300c
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerTracePC.h
@@ -0,0 +1,291 @@
+//===- FuzzerTracePC.h - Internal header for the Fuzzer ---------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::TracePC
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_TRACE_PC
+#define LLVM_FUZZER_TRACE_PC
+
+#include "FuzzerDefs.h"
+#include "FuzzerDictionary.h"
+#include "FuzzerValueBitMap.h"
+
+#include <set>
+#include <unordered_map>
+
+namespace fuzzer {
+
+// TableOfRecentCompares (TORC) remembers the most recently performed
+// comparisons of type T.
+// We record the arguments of CMP instructions in this table unconditionally
+// because it seems cheaper this way than to compute some expensive
+// conditions inside __sanitizer_cov_trace_cmp*.
+// After the unit has been executed we may decide to use the contents of
+// this table to populate a Dictionary.
+template<class T, size_t kSizeT>
+struct TableOfRecentCompares {
+  static const size_t kSize = kSizeT;
+  struct Pair {
+    T A, B;
+  };
+  ATTRIBUTE_NO_SANITIZE_ALL
+  void Insert(size_t Idx, const T &Arg1, const T &Arg2) {
+    Idx = Idx % kSize;
+    Table[Idx].A = Arg1;
+    Table[Idx].B = Arg2;
+  }
+
+  Pair Get(size_t I) { return Table[I % kSize]; }
+
+  Pair Table[kSize];
+};
+
+template <size_t kSizeT>
+struct MemMemTable {
+  static const size_t kSize = kSizeT;
+  Word MemMemWords[kSize];
+  Word EmptyWord;
+
+  void Add(const uint8_t *Data, size_t Size) {
+    if (Size <= 2) return;
+    Size = std::min(Size, Word::GetMaxSize());
+    size_t Idx = SimpleFastHash(Data, Size) % kSize;
+    MemMemWords[Idx].Set(Data, Size);
+  }
+  const Word &Get(size_t Idx) {
+    for (size_t i = 0; i < kSize; i++) {
+      const Word &W = MemMemWords[(Idx + i) % kSize];
+      if (W.size()) return W;
+    }
+    EmptyWord.Set(nullptr, 0);
+    return EmptyWord;
+  }
+};
+
+class TracePC {
+ public:
+  void HandleInline8bitCountersInit(uint8_t *Start, uint8_t *Stop);
+  void HandlePCsInit(const uintptr_t *Start, const uintptr_t *Stop);
+  void HandleCallerCallee(uintptr_t Caller, uintptr_t Callee);
+  template <class T> void HandleCmp(uintptr_t PC, T Arg1, T Arg2);
+  size_t GetTotalPCCoverage();
+  void SetUseCounters(bool UC) { UseCounters = UC; }
+  void SetUseValueProfileMask(uint32_t VPMask) { UseValueProfileMask = VPMask; }
+  void SetPrintNewPCs(bool P) { DoPrintNewPCs = P; }
+  void SetPrintNewFuncs(size_t P) { NumPrintNewFuncs = P; }
+  void UpdateObservedPCs();
+  template <class Callback> void CollectFeatures(Callback CB) const;
+
+  void ResetMaps() {
+    ValueProfileMap.Reset();
+    ClearExtraCounters();
+    ClearInlineCounters();
+  }
+
+  void ClearInlineCounters();
+
+  void UpdateFeatureSet(size_t CurrentElementIdx, size_t CurrentElementSize);
+  void PrintFeatureSet();
+
+  void PrintModuleInfo();
+
+  void PrintCoverage();
+
+  template<class CallBack>
+  void IterateCoveredFunctions(CallBack CB);
+
+  void AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2,
+                         size_t n, bool StopAtZero);
+
+  TableOfRecentCompares<uint32_t, 32> TORC4;
+  TableOfRecentCompares<uint64_t, 32> TORC8;
+  TableOfRecentCompares<Word, 32> TORCW;
+  MemMemTable<1024> MMT;
+
+  void RecordInitialStack();
+  uintptr_t GetMaxStackOffset() const;
+
+  template<class CallBack>
+  void ForEachObservedPC(CallBack CB) {
+    for (auto PC : ObservedPCs)
+      CB(PC);
+  }
+
+  void SetFocusFunction(const std::string &FuncName);
+  bool ObservedFocusFunction();
+
+  struct PCTableEntry {
+    uintptr_t PC, PCFlags;
+  };
+
+  uintptr_t PCTableEntryIdx(const PCTableEntry *TE);
+  const PCTableEntry *PCTableEntryByIdx(uintptr_t Idx);
+  static uintptr_t GetNextInstructionPc(uintptr_t PC);
+  bool PcIsFuncEntry(const PCTableEntry *TE) { return TE->PCFlags & 1; }
+
+private:
+  bool UseCounters = false;
+  uint32_t UseValueProfileMask = false;
+  bool DoPrintNewPCs = false;
+  size_t NumPrintNewFuncs = 0;
+
+  // Module represents the array of 8-bit counters split into regions
+  // such that every region, except maybe the first and the last one, is one
+  // full page.
+  struct Module {
+    struct Region {
+      uint8_t *Start, *Stop;
+      bool Enabled;
+      bool OneFullPage;
+    };
+    Region *Regions;
+    size_t NumRegions;
+    uint8_t *Start() { return Regions[0].Start; }
+    uint8_t *Stop()  { return Regions[NumRegions - 1].Stop; }
+    size_t Size()   { return Stop() - Start(); }
+    size_t  Idx(uint8_t *P) {
+      assert(P >= Start() && P < Stop());
+      return P - Start();
+    }
+  };
+
+  Module Modules[4096];
+  size_t NumModules;  // linker-initialized.
+  size_t NumInline8bitCounters;
+
+  template <class Callback>
+  void IterateCounterRegions(Callback CB) {
+    for (size_t m = 0; m < NumModules; m++)
+      for (size_t r = 0; r < Modules[m].NumRegions; r++)
+        CB(Modules[m].Regions[r]);
+  }
+
+  struct { const PCTableEntry *Start, *Stop; } ModulePCTable[4096];
+  size_t NumPCTables;
+  size_t NumPCsInPCTables;
+
+  Set<const PCTableEntry*> ObservedPCs;
+  std::unordered_map<uintptr_t, uintptr_t> ObservedFuncs;  // PC => Counter.
+
+  uint8_t *FocusFunctionCounterPtr = nullptr;
+
+  ValueBitMap ValueProfileMap;
+  uintptr_t InitialStack;
+};
+
+template <class Callback>
+// void Callback(size_t FirstFeature, size_t Idx, uint8_t Value);
+ATTRIBUTE_NO_SANITIZE_ALL
+size_t ForEachNonZeroByte(const uint8_t *Begin, const uint8_t *End,
+                        size_t FirstFeature, Callback Handle8bitCounter) {
+  typedef uintptr_t LargeType;
+  const size_t Step = sizeof(LargeType) / sizeof(uint8_t);
+  const size_t StepMask = Step - 1;
+  auto P = Begin;
+  // Iterate by 1 byte until either the alignment boundary or the end.
+  for (; reinterpret_cast<uintptr_t>(P) & StepMask && P < End; P++)
+    if (uint8_t V = *P)
+      Handle8bitCounter(FirstFeature, P - Begin, V);
+
+  // Iterate by Step bytes at a time.
+  for (; P < End; P += Step)
+    if (LargeType Bundle = *reinterpret_cast<const LargeType *>(P)) {
+      Bundle = HostToLE(Bundle);
+      for (size_t I = 0; I < Step; I++, Bundle >>= 8)
+        if (uint8_t V = Bundle & 0xff)
+          Handle8bitCounter(FirstFeature, P - Begin + I, V);
+    }
+
+  // Iterate by 1 byte until the end.
+  for (; P < End; P++)
+    if (uint8_t V = *P)
+      Handle8bitCounter(FirstFeature, P - Begin, V);
+  return End - Begin;
+}
+
+// Given a non-zero Counter returns a number in the range [0,7].
+template<class T>
+unsigned CounterToFeature(T Counter) {
+    // Returns a feature number by placing Counters into buckets as illustrated
+    // below.
+    //
+    // Counter bucket: [1] [2] [3] [4-7] [8-15] [16-31] [32-127] [128+]
+    // Feature number:  0   1   2    3     4       5       6       7
+    //
+    // This is a heuristic taken from AFL (see
+    // http://lcamtuf.coredump.cx/afl/technical_details.txt).
+    //
+    // This implementation may change in the future so clients should
+    // not rely on it.
+    assert(Counter);
+    unsigned Bit = 0;
+    /**/ if (Counter >= 128) Bit = 7;
+    else if (Counter >= 32) Bit = 6;
+    else if (Counter >= 16) Bit = 5;
+    else if (Counter >= 8) Bit = 4;
+    else if (Counter >= 4) Bit = 3;
+    else if (Counter >= 3) Bit = 2;
+    else if (Counter >= 2) Bit = 1;
+    return Bit;
+}
+
+template <class Callback>  // void Callback(size_t Feature)
+ATTRIBUTE_NO_SANITIZE_ADDRESS
+ATTRIBUTE_NOINLINE
+void TracePC::CollectFeatures(Callback HandleFeature) const {
+  auto Handle8bitCounter = [&](size_t FirstFeature,
+                               size_t Idx, uint8_t Counter) {
+    if (UseCounters)
+      HandleFeature(FirstFeature + Idx * 8 + CounterToFeature(Counter));
+    else
+      HandleFeature(FirstFeature + Idx);
+  };
+
+  size_t FirstFeature = 0;
+
+  for (size_t i = 0; i < NumModules; i++) {
+    for (size_t r = 0; r < Modules[i].NumRegions; r++) {
+      if (!Modules[i].Regions[r].Enabled) continue;
+      FirstFeature += 8 * ForEachNonZeroByte(Modules[i].Regions[r].Start,
+                                             Modules[i].Regions[r].Stop,
+                                             FirstFeature, Handle8bitCounter);
+    }
+  }
+
+  FirstFeature +=
+      8 * ForEachNonZeroByte(ExtraCountersBegin(), ExtraCountersEnd(),
+                             FirstFeature, Handle8bitCounter);
+
+  if (UseValueProfileMask) {
+    ValueProfileMap.ForEach([&](size_t Idx) {
+      HandleFeature(FirstFeature + Idx);
+    });
+    FirstFeature += ValueProfileMap.SizeInBits();
+  }
+
+  // Step function, grows similar to 8 * Log_2(A).
+  auto StackDepthStepFunction = [](uint32_t A) -> uint32_t {
+    if (!A) return A;
+    uint32_t Log2 = Log(A);
+    if (Log2 < 3) return A;
+    Log2 -= 3;
+    return (Log2 + 1) * 8 + ((A >> Log2) & 7);
+  };
+  assert(StackDepthStepFunction(1024) == 64);
+  assert(StackDepthStepFunction(1024 * 4) == 80);
+  assert(StackDepthStepFunction(1024 * 1024) == 144);
+
+  if (auto MaxStackOffset = GetMaxStackOffset())
+    HandleFeature(FirstFeature + StackDepthStepFunction(MaxStackOffset / 8));
+}
+
+extern TracePC TPC;
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_TRACE_PC
diff --git a/custom_mutators/libfuzzer/FuzzerUtil.cpp b/custom_mutators/libfuzzer/FuzzerUtil.cpp
new file mode 100644
index 00000000..7c395f7d
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtil.cpp
@@ -0,0 +1,314 @@
+//===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerUtil.h"
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include <cassert>
+#include <chrono>
+#include <cstring>
+#include <errno.h>
+#include <mutex>
+#include <signal.h>
+#include <sstream>
+#include <stdio.h>
+#include <sys/types.h>
+#include <thread>
+
+namespace fuzzer {
+
+void PrintHexArray(const uint8_t *Data, size_t Size, const char *PrintAfter) {
+
+  for (size_t i = 0; i < Size; i++)
+    Printf("0x%x,", (unsigned)Data[i]);
+  Printf("%s", PrintAfter);
+
+}
+
+void Print(const Unit &v, const char *PrintAfter) {
+
+  PrintHexArray(v.data(), v.size(), PrintAfter);
+
+}
+
+void PrintASCIIByte(uint8_t Byte) {
+
+  if (Byte == '\\')
+    Printf("\\\\");
+  else if (Byte == '"')
+    Printf("\\\"");
+  else if (Byte >= 32 && Byte < 127)
+    Printf("%c", Byte);
+  else
+    Printf("\\x%02x", Byte);
+
+}
+
+void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter) {
+
+  for (size_t i = 0; i < Size; i++)
+    PrintASCIIByte(Data[i]);
+  Printf("%s", PrintAfter);
+
+}
+
+void PrintASCII(const Unit &U, const char *PrintAfter) {
+
+  PrintASCII(U.data(), U.size(), PrintAfter);
+
+}
+
+bool ToASCII(uint8_t *Data, size_t Size) {
+
+  bool Changed = false;
+  for (size_t i = 0; i < Size; i++) {
+
+    uint8_t &X = Data[i];
+    auto     NewX = X;
+    NewX &= 127;
+    if (!isspace(NewX) && !isprint(NewX)) NewX = ' ';
+    Changed |= NewX != X;
+    X = NewX;
+
+  }
+
+  return Changed;
+
+}
+
+bool IsASCII(const Unit &U) {
+
+  return IsASCII(U.data(), U.size());
+
+}
+
+bool IsASCII(const uint8_t *Data, size_t Size) {
+
+  for (size_t i = 0; i < Size; i++)
+    if (!(isprint(Data[i]) || isspace(Data[i]))) return false;
+  return true;
+
+}
+
+bool ParseOneDictionaryEntry(const std::string &Str, Unit *U) {
+
+  U->clear();
+  if (Str.empty()) return false;
+  size_t L = 0, R = Str.size() - 1;  // We are parsing the range [L,R].
+  // Skip spaces from both sides.
+  while (L < R && isspace(Str[L]))
+    L++;
+  while (R > L && isspace(Str[R]))
+    R--;
+  if (R - L < 2) return false;
+  // Check the closing "
+  if (Str[R] != '"') return false;
+  R--;
+  // Find the opening "
+  while (L < R && Str[L] != '"')
+    L++;
+  if (L >= R) return false;
+  assert(Str[L] == '\"');
+  L++;
+  assert(L <= R);
+  for (size_t Pos = L; Pos <= R; Pos++) {
+
+    uint8_t V = (uint8_t)Str[Pos];
+    if (!isprint(V) && !isspace(V)) return false;
+    if (V == '\\') {
+
+      // Handle '\\'
+      if (Pos + 1 <= R && (Str[Pos + 1] == '\\' || Str[Pos + 1] == '"')) {
+
+        U->push_back(Str[Pos + 1]);
+        Pos++;
+        continue;
+
+      }
+
+      // Handle '\xAB'
+      if (Pos + 3 <= R && Str[Pos + 1] == 'x' && isxdigit(Str[Pos + 2]) &&
+          isxdigit(Str[Pos + 3])) {
+
+        char Hex[] = "0xAA";
+        Hex[2] = Str[Pos + 2];
+        Hex[3] = Str[Pos + 3];
+        U->push_back(strtol(Hex, nullptr, 16));
+        Pos += 3;
+        continue;
+
+      }
+
+      return false;  // Invalid escape.
+
+    } else {
+
+      // Any other character.
+      U->push_back(V);
+
+    }
+
+  }
+
+  return true;
+
+}
+
+bool ParseDictionaryFile(const std::string &Text, Vector<Unit> *Units) {
+
+  if (Text.empty()) {
+
+    Printf("ParseDictionaryFile: file does not exist or is empty\n");
+    return false;
+
+  }
+
+  std::istringstream ISS(Text);
+  Units->clear();
+  Unit        U;
+  int         LineNo = 0;
+  std::string S;
+  while (std::getline(ISS, S, '\n')) {
+
+    LineNo++;
+    size_t Pos = 0;
+    while (Pos < S.size() && isspace(S[Pos]))
+      Pos++;                        // Skip spaces.
+    if (Pos == S.size()) continue;  // Empty line.
+    if (S[Pos] == '#') continue;    // Comment line.
+    if (ParseOneDictionaryEntry(S, &U)) {
+
+      Units->push_back(U);
+
+    } else {
+
+      Printf("ParseDictionaryFile: error in line %d\n\t\t%s\n", LineNo,
+             S.c_str());
+      return false;
+
+    }
+
+  }
+
+  return true;
+
+}
+
+// Code duplicated (and tested) in llvm/include/llvm/Support/Base64.h
+std::string Base64(const Unit &U) {
+
+  static const char Table[] =
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+      "abcdefghijklmnopqrstuvwxyz"
+      "0123456789+/";
+  std::string Buffer;
+  Buffer.resize(((U.size() + 2) / 3) * 4);
+
+  size_t i = 0, j = 0;
+  for (size_t n = U.size() / 3 * 3; i < n; i += 3, j += 4) {
+
+    uint32_t x = ((unsigned char)U[i] << 16) | ((unsigned char)U[i + 1] << 8) |
+                 (unsigned char)U[i + 2];
+    Buffer[j + 0] = Table[(x >> 18) & 63];
+    Buffer[j + 1] = Table[(x >> 12) & 63];
+    Buffer[j + 2] = Table[(x >> 6) & 63];
+    Buffer[j + 3] = Table[x & 63];
+
+  }
+
+  if (i + 1 == U.size()) {
+
+    uint32_t x = ((unsigned char)U[i] << 16);
+    Buffer[j + 0] = Table[(x >> 18) & 63];
+    Buffer[j + 1] = Table[(x >> 12) & 63];
+    Buffer[j + 2] = '=';
+    Buffer[j + 3] = '=';
+
+  } else if (i + 2 == U.size()) {
+
+    uint32_t x = ((unsigned char)U[i] << 16) | ((unsigned char)U[i + 1] << 8);
+    Buffer[j + 0] = Table[(x >> 18) & 63];
+    Buffer[j + 1] = Table[(x >> 12) & 63];
+    Buffer[j + 2] = Table[(x >> 6) & 63];
+    Buffer[j + 3] = '=';
+
+  }
+
+  return Buffer;
+
+}
+
+static std::mutex SymbolizeMutex;
+
+std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC) {
+
+  std::unique_lock<std::mutex> l(SymbolizeMutex, std::try_to_lock);
+  if (!EF->__sanitizer_symbolize_pc || !l.owns_lock())
+    return "<can not symbolize>";
+  char PcDescr[1024] = {};
+  EF->__sanitizer_symbolize_pc(reinterpret_cast<void *>(PC), SymbolizedFMT,
+                               PcDescr, sizeof(PcDescr));
+  PcDescr[sizeof(PcDescr) - 1] = 0;  // Just in case.
+  return PcDescr;
+
+}
+
+void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC) {
+
+  if (EF->__sanitizer_symbolize_pc)
+    Printf("%s", DescribePC(SymbolizedFMT, PC).c_str());
+  else
+    Printf(FallbackFMT, PC);
+
+}
+
+void PrintStackTrace() {
+
+  std::unique_lock<std::mutex> l(SymbolizeMutex, std::try_to_lock);
+  if (EF->__sanitizer_print_stack_trace && l.owns_lock())
+    EF->__sanitizer_print_stack_trace();
+
+}
+
+void PrintMemoryProfile() {
+
+  std::unique_lock<std::mutex> l(SymbolizeMutex, std::try_to_lock);
+  if (EF->__sanitizer_print_memory_profile && l.owns_lock())
+    EF->__sanitizer_print_memory_profile(95, 8);
+
+}
+
+unsigned NumberOfCpuCores() {
+
+  unsigned N = std::thread::hardware_concurrency();
+  if (!N) {
+
+    Printf(
+        "WARNING: std::thread::hardware_concurrency not well defined for "
+        "your platform. Assuming CPU count of 1.\n");
+    N = 1;
+
+  }
+
+  return N;
+
+}
+
+size_t SimpleFastHash(const uint8_t *Data, size_t Size) {
+
+  size_t Res = 0;
+  for (size_t i = 0; i < Size; i++)
+    Res = Res * 11 + Data[i];
+  return Res;
+
+}
+
+}  // namespace fuzzer
+
diff --git a/custom_mutators/libfuzzer/FuzzerUtil.h b/custom_mutators/libfuzzer/FuzzerUtil.h
new file mode 100644
index 00000000..e90be085
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtil.h
@@ -0,0 +1,117 @@
+//===- FuzzerUtil.h - Internal header for the Fuzzer Utils ------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Util functions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_UTIL_H
+#define LLVM_FUZZER_UTIL_H
+
+#include "FuzzerBuiltins.h"
+#include "FuzzerBuiltinsMsvc.h"
+#include "FuzzerCommand.h"
+#include "FuzzerDefs.h"
+
+namespace fuzzer {
+
+void PrintHexArray(const Unit &U, const char *PrintAfter = "");
+
+void PrintHexArray(const uint8_t *Data, size_t Size,
+                   const char *PrintAfter = "");
+
+void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter = "");
+
+void PrintASCII(const Unit &U, const char *PrintAfter = "");
+
+// Changes U to contain only ASCII (isprint+isspace) characters.
+// Returns true iff U has been changed.
+bool ToASCII(uint8_t *Data, size_t Size);
+
+bool IsASCII(const Unit &U);
+
+bool IsASCII(const uint8_t *Data, size_t Size);
+
+std::string Base64(const Unit &U);
+
+void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC);
+
+std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC);
+
+void PrintStackTrace();
+
+void PrintMemoryProfile();
+
+unsigned NumberOfCpuCores();
+
+// Platform specific functions.
+void SetSignalHandler(const FuzzingOptions& Options);
+
+void SleepSeconds(int Seconds);
+
+unsigned long GetPid();
+
+size_t GetPeakRSSMb();
+
+int ExecuteCommand(const Command &Cmd);
+bool ExecuteCommand(const Command &Cmd, std::string *CmdOutput);
+
+// Fuchsia does not have popen/pclose.
+FILE *OpenProcessPipe(const char *Command, const char *Mode);
+int CloseProcessPipe(FILE *F);
+
+const void *SearchMemory(const void *haystack, size_t haystacklen,
+                         const void *needle, size_t needlelen);
+
+std::string CloneArgsWithoutX(const Vector<std::string> &Args,
+                              const char *X1, const char *X2);
+
+inline std::string CloneArgsWithoutX(const Vector<std::string> &Args,
+                                     const char *X) {
+  return CloneArgsWithoutX(Args, X, X);
+}
+
+inline std::pair<std::string, std::string> SplitBefore(std::string X,
+                                                       std::string S) {
+  auto Pos = S.find(X);
+  if (Pos == std::string::npos)
+    return std::make_pair(S, "");
+  return std::make_pair(S.substr(0, Pos), S.substr(Pos));
+}
+
+void DiscardOutput(int Fd);
+
+std::string DisassembleCmd(const std::string &FileName);
+
+std::string SearchRegexCmd(const std::string &Regex);
+
+size_t SimpleFastHash(const uint8_t *Data, size_t Size);
+
+inline uint32_t Log(uint32_t X) { return 32 - Clz(X) - 1; }
+
+inline size_t PageSize() { return 4096; }
+inline uint8_t *RoundUpByPage(uint8_t *P) {
+  uintptr_t X = reinterpret_cast<uintptr_t>(P);
+  size_t Mask = PageSize() - 1;
+  X = (X + Mask) & ~Mask;
+  return reinterpret_cast<uint8_t *>(X);
+}
+inline uint8_t *RoundDownByPage(uint8_t *P) {
+  uintptr_t X = reinterpret_cast<uintptr_t>(P);
+  size_t Mask = PageSize() - 1;
+  X = X & ~Mask;
+  return reinterpret_cast<uint8_t *>(X);
+}
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+template <typename T> T HostToLE(T X) { return X; }
+#else
+template <typename T> T HostToLE(T X) { return Bswap(X); }
+#endif
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_UTIL_H
diff --git a/custom_mutators/libfuzzer/FuzzerUtilDarwin.cpp b/custom_mutators/libfuzzer/FuzzerUtilDarwin.cpp
new file mode 100644
index 00000000..420d8c23
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtilDarwin.cpp
@@ -0,0 +1,205 @@
+//===- FuzzerUtilDarwin.cpp - Misc utils ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils for Darwin.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_APPLE
+  #include "FuzzerCommand.h"
+  #include "FuzzerIO.h"
+  #include <mutex>
+  #include <signal.h>
+  #include <spawn.h>
+  #include <stdlib.h>
+  #include <string.h>
+  #include <sys/wait.h>
+  #include <unistd.h>
+
+// There is no header for this on macOS so declare here
+extern "C" char **environ;
+
+namespace fuzzer {
+
+static std::mutex SignalMutex;
+// Global variables used to keep track of how signal handling should be
+// restored. They should **not** be accessed without holding `SignalMutex`.
+static int              ActiveThreadCount = 0;
+static struct sigaction OldSigIntAction;
+static struct sigaction OldSigQuitAction;
+static sigset_t         OldBlockedSignalsSet;
+
+// This is a reimplementation of Libc's `system()`. On Darwin the Libc
+// implementation contains a mutex which prevents it from being used
+// concurrently. This implementation **can** be used concurrently. It sets the
+// signal handlers when the first thread enters and restores them when the last
+// thread finishes execution of the function and ensures this is not racey by
+// using a mutex.
+int ExecuteCommand(const Command &Cmd) {
+
+  std::string       CmdLine = Cmd.toString();
+  posix_spawnattr_t SpawnAttributes;
+  if (posix_spawnattr_init(&SpawnAttributes)) return -1;
+  // Block and ignore signals of the current process when the first thread
+  // enters.
+  {
+
+    std::lock_guard<std::mutex> Lock(SignalMutex);
+    if (ActiveThreadCount == 0) {
+
+      static struct sigaction IgnoreSignalAction;
+      sigset_t                BlockedSignalsSet;
+      memset(&IgnoreSignalAction, 0, sizeof(IgnoreSignalAction));
+      IgnoreSignalAction.sa_handler = SIG_IGN;
+
+      if (sigaction(SIGINT, &IgnoreSignalAction, &OldSigIntAction) == -1) {
+
+        Printf("Failed to ignore SIGINT\n");
+        (void)posix_spawnattr_destroy(&SpawnAttributes);
+        return -1;
+
+      }
+
+      if (sigaction(SIGQUIT, &IgnoreSignalAction, &OldSigQuitAction) == -1) {
+
+        Printf("Failed to ignore SIGQUIT\n");
+        // Try our best to restore the signal handlers.
+        (void)sigaction(SIGINT, &OldSigIntAction, NULL);
+        (void)posix_spawnattr_destroy(&SpawnAttributes);
+        return -1;
+
+      }
+
+      (void)sigemptyset(&BlockedSignalsSet);
+      (void)sigaddset(&BlockedSignalsSet, SIGCHLD);
+      if (sigprocmask(SIG_BLOCK, &BlockedSignalsSet, &OldBlockedSignalsSet) ==
+          -1) {
+
+        Printf("Failed to block SIGCHLD\n");
+        // Try our best to restore the signal handlers.
+        (void)sigaction(SIGQUIT, &OldSigQuitAction, NULL);
+        (void)sigaction(SIGINT, &OldSigIntAction, NULL);
+        (void)posix_spawnattr_destroy(&SpawnAttributes);
+        return -1;
+
+      }
+
+    }
+
+    ++ActiveThreadCount;
+
+  }
+
+  // NOTE: Do not introduce any new `return` statements past this
+  // point. It is important that `ActiveThreadCount` always be decremented
+  // when leaving this function.
+
+  // Make sure the child process uses the default handlers for the
+  // following signals rather than inheriting what the parent has.
+  sigset_t DefaultSigSet;
+  (void)sigemptyset(&DefaultSigSet);
+  (void)sigaddset(&DefaultSigSet, SIGQUIT);
+  (void)sigaddset(&DefaultSigSet, SIGINT);
+  (void)posix_spawnattr_setsigdefault(&SpawnAttributes, &DefaultSigSet);
+  // Make sure the child process doesn't block SIGCHLD
+  (void)posix_spawnattr_setsigmask(&SpawnAttributes, &OldBlockedSignalsSet);
+  short SpawnFlags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
+  (void)posix_spawnattr_setflags(&SpawnAttributes, SpawnFlags);
+
+  pid_t       Pid;
+  char **     Environ = environ;  // Read from global
+  const char *CommandCStr = CmdLine.c_str();
+  char *const Argv[] = {strdup("sh"), strdup("-c"), strdup(CommandCStr), NULL};
+  int         ErrorCode = 0, ProcessStatus = 0;
+  // FIXME: We probably shouldn't hardcode the shell path.
+  ErrorCode =
+      posix_spawn(&Pid, "/bin/sh", NULL, &SpawnAttributes, Argv, Environ);
+  (void)posix_spawnattr_destroy(&SpawnAttributes);
+  if (!ErrorCode) {
+
+    pid_t SavedPid = Pid;
+    do {
+
+      // Repeat until call completes uninterrupted.
+      Pid = waitpid(SavedPid, &ProcessStatus, /*options=*/0);
+
+    } while (Pid == -1 && errno == EINTR);
+
+    if (Pid == -1) {
+
+      // Fail for some other reason.
+      ProcessStatus = -1;
+
+    }
+
+  } else if (ErrorCode == ENOMEM || ErrorCode == EAGAIN) {
+
+    // Fork failure.
+    ProcessStatus = -1;
+
+  } else {
+
+    // Shell execution failure.
+    ProcessStatus = W_EXITCODE(127, 0);
+
+  }
+
+  for (unsigned i = 0, n = sizeof(Argv) / sizeof(Argv[0]); i < n; ++i)
+    free(Argv[i]);
+
+  // Restore the signal handlers of the current process when the last thread
+  // using this function finishes.
+  {
+
+    std::lock_guard<std::mutex> Lock(SignalMutex);
+    --ActiveThreadCount;
+    if (ActiveThreadCount == 0) {
+
+      bool FailedRestore = false;
+      if (sigaction(SIGINT, &OldSigIntAction, NULL) == -1) {
+
+        Printf("Failed to restore SIGINT handling\n");
+        FailedRestore = true;
+
+      }
+
+      if (sigaction(SIGQUIT, &OldSigQuitAction, NULL) == -1) {
+
+        Printf("Failed to restore SIGQUIT handling\n");
+        FailedRestore = true;
+
+      }
+
+      if (sigprocmask(SIG_BLOCK, &OldBlockedSignalsSet, NULL) == -1) {
+
+        Printf("Failed to unblock SIGCHLD\n");
+        FailedRestore = true;
+
+      }
+
+      if (FailedRestore) ProcessStatus = -1;
+
+    }
+
+  }
+
+  return ProcessStatus;
+
+}
+
+void DiscardOutput(int Fd) {
+
+  FILE *Temp = fopen("/dev/null", "w");
+  if (!Temp) return;
+  dup2(fileno(Temp), Fd);
+  fclose(Temp);
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_APPLE
+
diff --git a/custom_mutators/libfuzzer/FuzzerUtilFuchsia.cpp b/custom_mutators/libfuzzer/FuzzerUtilFuchsia.cpp
new file mode 100644
index 00000000..45ecbca8
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtilFuchsia.cpp
@@ -0,0 +1,658 @@
+//===- FuzzerUtilFuchsia.cpp - Misc utils for Fuchsia. --------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils implementation using Fuchsia/Zircon APIs.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+
+#if LIBFUZZER_FUCHSIA
+
+  #include "FuzzerInternal.h"
+  #include "FuzzerUtil.h"
+  #include <cassert>
+  #include <cerrno>
+  #include <cinttypes>
+  #include <cstdint>
+  #include <fcntl.h>
+  #include <lib/fdio/fdio.h>
+  #include <lib/fdio/spawn.h>
+  #include <string>
+  #include <sys/select.h>
+  #include <thread>
+  #include <unistd.h>
+  #include <zircon/errors.h>
+  #include <zircon/process.h>
+  #include <zircon/sanitizer.h>
+  #include <zircon/status.h>
+  #include <zircon/syscalls.h>
+  #include <zircon/syscalls/debug.h>
+  #include <zircon/syscalls/exception.h>
+  #include <zircon/syscalls/object.h>
+  #include <zircon/types.h>
+
+  #include <vector>
+
+namespace fuzzer {
+
+// Given that Fuchsia doesn't have the POSIX signals that libFuzzer was written
+// around, the general approach is to spin up dedicated threads to watch for
+// each requested condition (alarm, interrupt, crash).  Of these, the crash
+// handler is the most involved, as it requires resuming the crashed thread in
+// order to invoke the sanitizers to get the needed state.
+
+// Forward declaration of assembly trampoline needed to resume crashed threads.
+// This appears to have external linkage to  C++, which is why it's not in the
+// anonymous namespace.  The assembly definition inside MakeTrampoline()
+// actually defines the symbol with internal linkage only.
+void CrashTrampolineAsm() __asm__("CrashTrampolineAsm");
+
+namespace {
+
+// Helper function to handle Zircon syscall failures.
+void ExitOnErr(zx_status_t Status, const char *Syscall) {
+
+  if (Status != ZX_OK) {
+
+    Printf("libFuzzer: %s failed: %s\n", Syscall,
+           _zx_status_get_string(Status));
+    exit(1);
+
+  }
+
+}
+
+void AlarmHandler(int Seconds) {
+
+  while (true) {
+
+    SleepSeconds(Seconds);
+    Fuzzer::StaticAlarmCallback();
+
+  }
+
+}
+
+void InterruptHandler() {
+
+  fd_set readfds;
+  // Ctrl-C sends ETX in Zircon.
+  do {
+
+    FD_ZERO(&readfds);
+    FD_SET(STDIN_FILENO, &readfds);
+    select(STDIN_FILENO + 1, &readfds, nullptr, nullptr, nullptr);
+
+  } while (!FD_ISSET(STDIN_FILENO, &readfds) || getchar() != 0x03);
+
+  Fuzzer::StaticInterruptCallback();
+
+}
+
+  // CFAOffset is used to reference the stack pointer before entering the
+  // trampoline (Stack Pointer + CFAOffset = prev Stack Pointer). Before jumping
+  // to the trampoline we copy all the registers onto the stack. We need to make
+  // sure that the new stack has enough space to store all the registers.
+  //
+  // The trampoline holds CFI information regarding the registers stored in the
+  // stack, which is then used by the unwinder to restore them.
+  #if defined(__x86_64__)
+// In x86_64 the crashing function might also be using the red zone (128 bytes
+// on top of their rsp).
+constexpr size_t CFAOffset = 128 + sizeof(zx_thread_state_general_regs_t);
+  #elif defined(__aarch64__)
+// In aarch64 we need to always have the stack pointer aligned to 16 bytes, so
+// we make sure that we are keeping that same alignment.
+constexpr size_t CFAOffset =
+    (sizeof(zx_thread_state_general_regs_t) + 15) & -(uintptr_t)16;
+  #endif
+
+  // For the crash handler, we need to call Fuzzer::StaticCrashSignalCallback
+  // without POSIX signal handlers.  To achieve this, we use an assembly
+  // function to add the necessary CFI unwinding information and a C function to
+  // bridge from that back into C++.
+
+  // FIXME: This works as a short-term solution, but this code really shouldn't
+  // be architecture dependent. A better long term solution is to implement
+  // remote unwinding and expose the necessary APIs through sanitizer_common
+  // and/or ASAN to allow the exception handling thread to gather the crash
+  // state directly.
+  //
+  // Alternatively, Fuchsia may in future actually implement basic signal
+  // handling for the machine trap signals.
+  #if defined(__x86_64__)
+    #define FOREACH_REGISTER(OP_REG, OP_NUM) \
+      OP_REG(rax)                            \
+      OP_REG(rbx)                            \
+      OP_REG(rcx)                            \
+      OP_REG(rdx)                            \
+      OP_REG(rsi)                            \
+      OP_REG(rdi)                            \
+      OP_REG(rbp)                            \
+      OP_REG(rsp)                            \
+      OP_REG(r8)                             \
+      OP_REG(r9)                             \
+      OP_REG(r10)                            \
+      OP_REG(r11)                            \
+      OP_REG(r12)                            \
+      OP_REG(r13)                            \
+      OP_REG(r14)                            \
+      OP_REG(r15)                            \
+      OP_REG(rip)
+
+  #elif defined(__aarch64__)
+    #define FOREACH_REGISTER(OP_REG, OP_NUM) \
+      OP_NUM(0)                              \
+      OP_NUM(1)                              \
+      OP_NUM(2)                              \
+      OP_NUM(3)                              \
+      OP_NUM(4)                              \
+      OP_NUM(5)                              \
+      OP_NUM(6)                              \
+      OP_NUM(7)                              \
+      OP_NUM(8)                              \
+      OP_NUM(9)                              \
+      OP_NUM(10)                             \
+      OP_NUM(11)                             \
+      OP_NUM(12)                             \
+      OP_NUM(13)                             \
+      OP_NUM(14)                             \
+      OP_NUM(15)                             \
+      OP_NUM(16)                             \
+      OP_NUM(17)                             \
+      OP_NUM(18)                             \
+      OP_NUM(19)                             \
+      OP_NUM(20)                             \
+      OP_NUM(21)                             \
+      OP_NUM(22)                             \
+      OP_NUM(23)                             \
+      OP_NUM(24)                             \
+      OP_NUM(25)                             \
+      OP_NUM(26)                             \
+      OP_NUM(27)                             \
+      OP_NUM(28)                             \
+      OP_NUM(29)                             \
+      OP_REG(sp)
+
+  #else
+    #error "Unsupported architecture for fuzzing on Fuchsia"
+  #endif
+
+  // Produces a CFI directive for the named or numbered register.
+  // The value used refers to an assembler immediate operand with the same name
+  // as the register (see ASM_OPERAND_REG).
+  #define CFI_OFFSET_REG(reg) ".cfi_offset " #reg ", %c[" #reg "]\n"
+  #define CFI_OFFSET_NUM(num) CFI_OFFSET_REG(x##num)
+
+  // Produces an assembler immediate operand for the named or numbered register.
+  // This operand contains the offset of the register relative to the CFA.
+  #define ASM_OPERAND_REG(reg) \
+    [reg] "i"(offsetof(zx_thread_state_general_regs_t, reg) - CFAOffset),
+  #define ASM_OPERAND_NUM(num) \
+    [x##num] "i"(offsetof(zx_thread_state_general_regs_t, r[num]) - CFAOffset),
+
+// Trampoline to bridge from the assembly below to the static C++ crash
+// callback.
+__attribute__((noreturn)) static void StaticCrashHandler() {
+
+  Fuzzer::StaticCrashSignalCallback();
+  for (;;) {
+
+    _Exit(1);
+
+  }
+
+}
+
+// Creates the trampoline with the necessary CFI information to unwind through
+// to the crashing call stack:
+//  * Defining the CFA so that it points to the stack pointer at the point
+//    of crash.
+//  * Storing all registers at the point of crash in the stack and refer to them
+//    via CFI information (relative to the CFA).
+//  * Setting the return column so the unwinder knows how to continue unwinding.
+//  * (x86_64) making sure rsp is aligned before calling StaticCrashHandler.
+//  * Calling StaticCrashHandler that will trigger the unwinder.
+//
+// The __attribute__((used)) is necessary because the function
+// is never called; it's just a container around the assembly to allow it to
+// use operands for compile-time computed constants.
+__attribute__((used)) void MakeTrampoline() {
+
+  __asm__(".cfi_endproc\n"
+    ".pushsection .text.CrashTrampolineAsm\n"
+    ".type CrashTrampolineAsm,STT_FUNC\n"
+"CrashTrampolineAsm:\n"
+    ".cfi_startproc simple\n"
+    ".cfi_signal_frame\n"
+  #if defined(__x86_64__)
+    ".cfi_return_column rip\n"
+    ".cfi_def_cfa rsp, %c[CFAOffset]\n"
+    FOREACH_REGISTER(CFI_OFFSET_REG, CFI_OFFSET_NUM)
+    "mov %%rsp, %%rbp\n"
+    ".cfi_def_cfa_register rbp\n"
+    "andq $-16, %%rsp\n"
+    "call %c[StaticCrashHandler]\n"
+    "ud2\n"
+  #elif defined(__aarch64__)
+    ".cfi_return_column 33\n"
+    ".cfi_def_cfa sp, %c[CFAOffset]\n"
+    FOREACH_REGISTER(CFI_OFFSET_REG, CFI_OFFSET_NUM)
+    ".cfi_offset 33, %c[pc]\n"
+    ".cfi_offset 30, %c[lr]\n"
+    "bl %c[StaticCrashHandler]\n"
+    "brk 1\n"
+  #else
+    #error "Unsupported architecture for fuzzing on Fuchsia"
+  #endif
+    ".cfi_endproc\n"
+    ".size CrashTrampolineAsm, . - CrashTrampolineAsm\n"
+    ".popsection\n"
+    ".cfi_startproc\n"
+    : // No outputs
+    : FOREACH_REGISTER(ASM_OPERAND_REG, ASM_OPERAND_NUM)
+  #if defined(__aarch64__)
+      ASM_OPERAND_REG(pc)
+      ASM_OPERAND_REG(lr)
+  #endif
+      [StaticCrashHandler] "i" (StaticCrashHandler),
+      [CFAOffset] "i" (CFAOffset));
+
+}
+
+void CrashHandler(zx_handle_t *Event) {
+
+  // This structure is used to ensure we close handles to objects we create in
+  // this handler.
+  struct ScopedHandle {
+
+    ~ScopedHandle() {
+
+      _zx_handle_close(Handle);
+
+    }
+
+    zx_handle_t Handle = ZX_HANDLE_INVALID;
+
+  };
+
+  // Create the exception channel.  We need to claim to be a "debugger" so the
+  // kernel will allow us to modify and resume dying threads (see below). Once
+  // the channel is set, we can signal the main thread to continue and wait
+  // for the exception to arrive.
+  ScopedHandle Channel;
+  zx_handle_t  Self = _zx_process_self();
+  ExitOnErr(_zx_task_create_exception_channel(
+                Self, ZX_EXCEPTION_CHANNEL_DEBUGGER, &Channel.Handle),
+            "_zx_task_create_exception_channel");
+
+  ExitOnErr(_zx_object_signal(*Event, 0, ZX_USER_SIGNAL_0),
+            "_zx_object_signal");
+
+  // This thread lives as long as the process in order to keep handling
+  // crashes.  In practice, the first crashed thread to reach the end of the
+  // StaticCrashHandler will end the process.
+  while (true) {
+
+    ExitOnErr(_zx_object_wait_one(Channel.Handle, ZX_CHANNEL_READABLE,
+                                  ZX_TIME_INFINITE, nullptr),
+              "_zx_object_wait_one");
+
+    zx_exception_info_t ExceptionInfo;
+    ScopedHandle        Exception;
+    ExitOnErr(
+        _zx_channel_read(Channel.Handle, 0, &ExceptionInfo, &Exception.Handle,
+                         sizeof(ExceptionInfo), 1, nullptr, nullptr),
+        "_zx_channel_read");
+
+    // Ignore informational synthetic exceptions.
+    if (ZX_EXCP_THREAD_STARTING == ExceptionInfo.type ||
+        ZX_EXCP_THREAD_EXITING == ExceptionInfo.type ||
+        ZX_EXCP_PROCESS_STARTING == ExceptionInfo.type) {
+
+      continue;
+
+    }
+
+    // At this point, we want to get the state of the crashing thread, but
+    // libFuzzer and the sanitizers assume this will happen from that same
+    // thread via a POSIX signal handler. "Resurrecting" the thread in the
+    // middle of the appropriate callback is as simple as forcibly setting the
+    // instruction pointer/program counter, provided we NEVER EVER return from
+    // that function (since otherwise our stack will not be valid).
+    ScopedHandle Thread;
+    ExitOnErr(_zx_exception_get_thread(Exception.Handle, &Thread.Handle),
+              "_zx_exception_get_thread");
+
+    zx_thread_state_general_regs_t GeneralRegisters;
+    ExitOnErr(
+        _zx_thread_read_state(Thread.Handle, ZX_THREAD_STATE_GENERAL_REGS,
+                              &GeneralRegisters, sizeof(GeneralRegisters)),
+        "_zx_thread_read_state");
+
+    // To unwind properly, we need to push the crashing thread's register state
+    // onto the stack and jump into a trampoline with CFI instructions on how
+    // to restore it.
+  #if defined(__x86_64__)
+    uintptr_t StackPtr = GeneralRegisters.rsp - CFAOffset;
+    __unsanitized_memcpy(reinterpret_cast<void *>(StackPtr), &GeneralRegisters,
+                         sizeof(GeneralRegisters));
+    GeneralRegisters.rsp = StackPtr;
+    GeneralRegisters.rip = reinterpret_cast<zx_vaddr_t>(CrashTrampolineAsm);
+
+  #elif defined(__aarch64__)
+    uintptr_t StackPtr = GeneralRegisters.sp - CFAOffset;
+    __unsanitized_memcpy(reinterpret_cast<void *>(StackPtr), &GeneralRegisters,
+                         sizeof(GeneralRegisters));
+    GeneralRegisters.sp = StackPtr;
+    GeneralRegisters.pc = reinterpret_cast<zx_vaddr_t>(CrashTrampolineAsm);
+
+  #else
+    #error "Unsupported architecture for fuzzing on Fuchsia"
+  #endif
+
+    // Now force the crashing thread's state.
+    ExitOnErr(
+        _zx_thread_write_state(Thread.Handle, ZX_THREAD_STATE_GENERAL_REGS,
+                               &GeneralRegisters, sizeof(GeneralRegisters)),
+        "_zx_thread_write_state");
+
+    // Set the exception to HANDLED so it resumes the thread on close.
+    uint32_t ExceptionState = ZX_EXCEPTION_STATE_HANDLED;
+    ExitOnErr(_zx_object_set_property(Exception.Handle, ZX_PROP_EXCEPTION_STATE,
+                                      &ExceptionState, sizeof(ExceptionState)),
+              "zx_object_set_property");
+
+  }
+
+}
+
+}  // namespace
+
+// Platform specific functions.
+void SetSignalHandler(const FuzzingOptions &Options) {
+
+  // Make sure information from libFuzzer and the sanitizers are easy to
+  // reassemble. `__sanitizer_log_write` has the added benefit of ensuring the
+  // DSO map is always available for the symbolizer.
+  // A uint64_t fits in 20 chars, so 64 is plenty.
+  char Buf[64];
+  memset(Buf, 0, sizeof(Buf));
+  snprintf(Buf, sizeof(Buf), "==%lu== INFO: libFuzzer starting.\n", GetPid());
+  if (EF->__sanitizer_log_write) __sanitizer_log_write(Buf, sizeof(Buf));
+  Printf("%s", Buf);
+
+  // Set up alarm handler if needed.
+  if (Options.HandleAlrm && Options.UnitTimeoutSec > 0) {
+
+    std::thread T(AlarmHandler, Options.UnitTimeoutSec / 2 + 1);
+    T.detach();
+
+  }
+
+  // Set up interrupt handler if needed.
+  if (Options.HandleInt || Options.HandleTerm) {
+
+    std::thread T(InterruptHandler);
+    T.detach();
+
+  }
+
+  // Early exit if no crash handler needed.
+  if (!Options.HandleSegv && !Options.HandleBus && !Options.HandleIll &&
+      !Options.HandleFpe && !Options.HandleAbrt)
+    return;
+
+  // Set up the crash handler and wait until it is ready before proceeding.
+  zx_handle_t Event;
+  ExitOnErr(_zx_event_create(0, &Event), "_zx_event_create");
+
+  std::thread T(CrashHandler, &Event);
+  zx_status_t Status =
+      _zx_object_wait_one(Event, ZX_USER_SIGNAL_0, ZX_TIME_INFINITE, nullptr);
+  _zx_handle_close(Event);
+  ExitOnErr(Status, "_zx_object_wait_one");
+
+  T.detach();
+
+}
+
+void SleepSeconds(int Seconds) {
+
+  _zx_nanosleep(_zx_deadline_after(ZX_SEC(Seconds)));
+
+}
+
+unsigned long GetPid() {
+
+  zx_status_t            rc;
+  zx_info_handle_basic_t Info;
+  if ((rc = _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &Info,
+                                sizeof(Info), NULL, NULL)) != ZX_OK) {
+
+    Printf("libFuzzer: unable to get info about self: %s\n",
+           _zx_status_get_string(rc));
+    exit(1);
+
+  }
+
+  return Info.koid;
+
+}
+
+size_t GetPeakRSSMb() {
+
+  zx_status_t          rc;
+  zx_info_task_stats_t Info;
+  if ((rc = _zx_object_get_info(_zx_process_self(), ZX_INFO_TASK_STATS, &Info,
+                                sizeof(Info), NULL, NULL)) != ZX_OK) {
+
+    Printf("libFuzzer: unable to get info about self: %s\n",
+           _zx_status_get_string(rc));
+    exit(1);
+
+  }
+
+  return (Info.mem_private_bytes + Info.mem_shared_bytes) >> 20;
+
+}
+
+template <typename Fn>
+class RunOnDestruction {
+
+ public:
+  explicit RunOnDestruction(Fn fn) : fn_(fn) {
+
+  }
+
+  ~RunOnDestruction() {
+
+    fn_();
+
+  }
+
+ private:
+  Fn fn_;
+
+};
+
+template <typename Fn>
+RunOnDestruction<Fn> at_scope_exit(Fn fn) {
+
+  return RunOnDestruction<Fn>(fn);
+
+}
+
+static fdio_spawn_action_t clone_fd_action(int localFd, int targetFd) {
+
+  return {
+
+      .action = FDIO_SPAWN_ACTION_CLONE_FD,
+      .fd =
+          {
+
+              .local_fd = localFd,
+              .target_fd = targetFd,
+
+          },
+
+  };
+
+}
+
+int ExecuteCommand(const Command &Cmd) {
+
+  zx_status_t rc;
+
+  // Convert arguments to C array
+  auto   Args = Cmd.getArguments();
+  size_t Argc = Args.size();
+  assert(Argc != 0);
+  std::unique_ptr<const char *[]> Argv(new const char *[Argc + 1]);
+  for (size_t i = 0; i < Argc; ++i)
+    Argv[i] = Args[i].c_str();
+  Argv[Argc] = nullptr;
+
+  // Determine output.  On Fuchsia, the fuzzer is typically run as a component
+  // that lacks a mutable working directory. Fortunately, when this is the case
+  // a mutable output directory must be specified using "-artifact_prefix=...",
+  // so write the log file(s) there.
+  // However, we don't want to apply this logic for absolute paths.
+  int  FdOut = STDOUT_FILENO;
+  bool discardStdout = false;
+  bool discardStderr = false;
+
+  if (Cmd.hasOutputFile()) {
+
+    std::string Path = Cmd.getOutputFile();
+    if (Path == getDevNull()) {
+
+      // On Fuchsia, there's no "/dev/null" like-file, so we
+      // just don't copy the FDs into the spawned process.
+      discardStdout = true;
+
+    } else {
+
+      bool IsAbsolutePath = Path.length() > 1 && Path[0] == '/';
+      if (!IsAbsolutePath && Cmd.hasFlag("artifact_prefix"))
+        Path = Cmd.getFlagValue("artifact_prefix") + "/" + Path;
+
+      FdOut = open(Path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0);
+      if (FdOut == -1) {
+
+        Printf("libFuzzer: failed to open %s: %s\n", Path.c_str(),
+               strerror(errno));
+        return ZX_ERR_IO;
+
+      }
+
+    }
+
+  }
+
+  auto CloseFdOut = at_scope_exit([FdOut]() {
+
+    if (FdOut != STDOUT_FILENO) close(FdOut);
+
+  });
+
+  // Determine stderr
+  int FdErr = STDERR_FILENO;
+  if (Cmd.isOutAndErrCombined()) {
+
+    FdErr = FdOut;
+    if (discardStdout) discardStderr = true;
+
+  }
+
+  // Clone the file descriptors into the new process
+  std::vector<fdio_spawn_action_t> SpawnActions;
+  SpawnActions.push_back(clone_fd_action(STDIN_FILENO, STDIN_FILENO));
+
+  if (!discardStdout)
+    SpawnActions.push_back(clone_fd_action(FdOut, STDOUT_FILENO));
+  if (!discardStderr)
+    SpawnActions.push_back(clone_fd_action(FdErr, STDERR_FILENO));
+
+  // Start the process.
+  char        ErrorMsg[FDIO_SPAWN_ERR_MSG_MAX_LENGTH];
+  zx_handle_t ProcessHandle = ZX_HANDLE_INVALID;
+  rc = fdio_spawn_etc(ZX_HANDLE_INVALID,
+                      FDIO_SPAWN_CLONE_ALL & (~FDIO_SPAWN_CLONE_STDIO), Argv[0],
+                      Argv.get(), nullptr, SpawnActions.size(),
+                      SpawnActions.data(), &ProcessHandle, ErrorMsg);
+
+  if (rc != ZX_OK) {
+
+    Printf("libFuzzer: failed to launch '%s': %s, %s\n", Argv[0], ErrorMsg,
+           _zx_status_get_string(rc));
+    return rc;
+
+  }
+
+  auto CloseHandle = at_scope_exit([&]() { _zx_handle_close(ProcessHandle); });
+
+  // Now join the process and return the exit status.
+  if ((rc = _zx_object_wait_one(ProcessHandle, ZX_PROCESS_TERMINATED,
+                                ZX_TIME_INFINITE, nullptr)) != ZX_OK) {
+
+    Printf("libFuzzer: failed to join '%s': %s\n", Argv[0],
+           _zx_status_get_string(rc));
+    return rc;
+
+  }
+
+  zx_info_process_t Info;
+  if ((rc = _zx_object_get_info(ProcessHandle, ZX_INFO_PROCESS, &Info,
+                                sizeof(Info), nullptr, nullptr)) != ZX_OK) {
+
+    Printf("libFuzzer: unable to get return code from '%s': %s\n", Argv[0],
+           _zx_status_get_string(rc));
+    return rc;
+
+  }
+
+  return Info.return_code;
+
+}
+
+bool ExecuteCommand(const Command &BaseCmd, std::string *CmdOutput) {
+
+  auto    LogFilePath = TempPath("SimPopenOut", ".txt");
+  Command Cmd(BaseCmd);
+  Cmd.setOutputFile(LogFilePath);
+  int Ret = ExecuteCommand(Cmd);
+  *CmdOutput = FileToString(LogFilePath);
+  RemoveFile(LogFilePath);
+  return Ret == 0;
+
+}
+
+const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
+                         size_t PattLen) {
+
+  return memmem(Data, DataLen, Patt, PattLen);
+
+}
+
+// In fuchsia, accessing /dev/null is not supported. There's nothing
+// similar to a file that discards everything that is written to it.
+// The way of doing something similar in fuchsia is by using
+// fdio_null_create and binding that to a file descriptor.
+void DiscardOutput(int Fd) {
+
+  fdio_t *fdio_null = fdio_null_create();
+  if (fdio_null == nullptr) return;
+  int nullfd = fdio_bind_to_fd(fdio_null, -1, 0);
+  if (nullfd < 0) return;
+  dup2(nullfd, Fd);
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_FUCHSIA
+
diff --git a/custom_mutators/libfuzzer/FuzzerUtilLinux.cpp b/custom_mutators/libfuzzer/FuzzerUtilLinux.cpp
new file mode 100644
index 00000000..f2531bee
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtilLinux.cpp
@@ -0,0 +1,43 @@
+//===- FuzzerUtilLinux.cpp - Misc utils for Linux. ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils for Linux.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \
+    LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN
+  #include "FuzzerCommand.h"
+
+  #include <stdlib.h>
+  #include <sys/types.h>
+  #include <sys/wait.h>
+  #include <unistd.h>
+
+namespace fuzzer {
+
+int ExecuteCommand(const Command &Cmd) {
+
+  std::string CmdLine = Cmd.toString();
+  int         exit_code = system(CmdLine.c_str());
+  if (WIFEXITED(exit_code)) return WEXITSTATUS(exit_code);
+  return exit_code;
+
+}
+
+void DiscardOutput(int Fd) {
+
+  FILE *Temp = fopen("/dev/null", "w");
+  if (!Temp) return;
+  dup2(fileno(Temp), Fd);
+  fclose(Temp);
+
+}
+
+}  // namespace fuzzer
+
+#endif
+
diff --git a/custom_mutators/libfuzzer/FuzzerUtilPosix.cpp b/custom_mutators/libfuzzer/FuzzerUtilPosix.cpp
new file mode 100644
index 00000000..372bfa5e
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtilPosix.cpp
@@ -0,0 +1,239 @@
+//===- FuzzerUtilPosix.cpp - Misc utils for Posix. ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils implementation using Posix API.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_POSIX
+  #include "FuzzerIO.h"
+  #include "FuzzerInternal.h"
+  #include "FuzzerTracePC.h"
+  #include <cassert>
+  #include <chrono>
+  #include <cstring>
+  #include <errno.h>
+  #include <iomanip>
+  #include <signal.h>
+  #include <stdio.h>
+  #include <sys/mman.h>
+  #include <sys/resource.h>
+  #include <sys/syscall.h>
+  #include <sys/time.h>
+  #include <sys/types.h>
+  #include <thread>
+  #include <unistd.h>
+
+namespace fuzzer {
+
+static void AlarmHandler(int, siginfo_t *, void *) {
+
+  Fuzzer::StaticAlarmCallback();
+
+}
+
+static void (*upstream_segv_handler)(int, siginfo_t *, void *);
+
+static void SegvHandler(int sig, siginfo_t *si, void *ucontext) {
+
+  assert(si->si_signo == SIGSEGV);
+  if (upstream_segv_handler) return upstream_segv_handler(sig, si, ucontext);
+  Fuzzer::StaticCrashSignalCallback();
+
+}
+
+static void CrashHandler(int, siginfo_t *, void *) {
+
+  Fuzzer::StaticCrashSignalCallback();
+
+}
+
+static void InterruptHandler(int, siginfo_t *, void *) {
+
+  Fuzzer::StaticInterruptCallback();
+
+}
+
+static void GracefulExitHandler(int, siginfo_t *, void *) {
+
+  Fuzzer::StaticGracefulExitCallback();
+
+}
+
+static void FileSizeExceedHandler(int, siginfo_t *, void *) {
+
+  Fuzzer::StaticFileSizeExceedCallback();
+
+}
+
+static void SetSigaction(int signum,
+                         void (*callback)(int, siginfo_t *, void *)) {
+
+  struct sigaction sigact = {};
+  if (sigaction(signum, nullptr, &sigact)) {
+
+    Printf("libFuzzer: sigaction failed with %d\n", errno);
+    exit(1);
+
+  }
+
+  if (sigact.sa_flags & SA_SIGINFO) {
+
+    if (sigact.sa_sigaction) {
+
+      if (signum != SIGSEGV) return;
+      upstream_segv_handler = sigact.sa_sigaction;
+
+    }
+
+  } else {
+
+    if (sigact.sa_handler != SIG_DFL && sigact.sa_handler != SIG_IGN &&
+        sigact.sa_handler != SIG_ERR)
+      return;
+
+  }
+
+  sigact = {};
+  sigact.sa_flags = SA_SIGINFO;
+  sigact.sa_sigaction = callback;
+  if (sigaction(signum, &sigact, 0)) {
+
+    Printf("libFuzzer: sigaction failed with %d\n", errno);
+    exit(1);
+
+  }
+
+}
+
+// Return true on success, false otherwise.
+bool ExecuteCommand(const Command &Cmd, std::string *CmdOutput) {
+
+  FILE *Pipe = popen(Cmd.toString().c_str(), "r");
+  if (!Pipe) return false;
+
+  if (CmdOutput) {
+
+    char TmpBuffer[128];
+    while (fgets(TmpBuffer, sizeof(TmpBuffer), Pipe))
+      CmdOutput->append(TmpBuffer);
+
+  }
+
+  return pclose(Pipe) == 0;
+
+}
+
+void SetTimer(int Seconds) {
+
+  struct itimerval T {
+
+    {Seconds, 0}, {
+
+      Seconds, 0
+
+    }
+
+  };
+
+  if (setitimer(ITIMER_REAL, &T, nullptr)) {
+
+    Printf("libFuzzer: setitimer failed with %d\n", errno);
+    exit(1);
+
+  }
+
+  SetSigaction(SIGALRM, AlarmHandler);
+
+}
+
+void SetSignalHandler(const FuzzingOptions &Options) {
+
+  // setitimer is not implemented in emscripten.
+  if (Options.HandleAlrm && Options.UnitTimeoutSec > 0 && !LIBFUZZER_EMSCRIPTEN)
+    SetTimer(Options.UnitTimeoutSec / 2 + 1);
+  if (Options.HandleInt) SetSigaction(SIGINT, InterruptHandler);
+  if (Options.HandleTerm) SetSigaction(SIGTERM, InterruptHandler);
+  if (Options.HandleSegv) SetSigaction(SIGSEGV, SegvHandler);
+  if (Options.HandleBus) SetSigaction(SIGBUS, CrashHandler);
+  if (Options.HandleAbrt) SetSigaction(SIGABRT, CrashHandler);
+  if (Options.HandleIll) SetSigaction(SIGILL, CrashHandler);
+  if (Options.HandleFpe) SetSigaction(SIGFPE, CrashHandler);
+  if (Options.HandleXfsz) SetSigaction(SIGXFSZ, FileSizeExceedHandler);
+  if (Options.HandleUsr1) SetSigaction(SIGUSR1, GracefulExitHandler);
+  if (Options.HandleUsr2) SetSigaction(SIGUSR2, GracefulExitHandler);
+
+}
+
+void SleepSeconds(int Seconds) {
+
+  sleep(Seconds);  // Use C API to avoid coverage from instrumented libc++.
+
+}
+
+unsigned long GetPid() {
+
+  return (unsigned long)getpid();
+
+}
+
+size_t GetPeakRSSMb() {
+
+  struct rusage usage;
+  if (getrusage(RUSAGE_SELF, &usage)) return 0;
+  if (LIBFUZZER_LINUX || LIBFUZZER_FREEBSD || LIBFUZZER_NETBSD ||
+      LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN) {
+
+    // ru_maxrss is in KiB
+    return usage.ru_maxrss >> 10;
+
+  } else if (LIBFUZZER_APPLE) {
+
+    // ru_maxrss is in bytes
+    return usage.ru_maxrss >> 20;
+
+  }
+
+  assert(0 && "GetPeakRSSMb() is not implemented for your platform");
+  return 0;
+
+}
+
+FILE *OpenProcessPipe(const char *Command, const char *Mode) {
+
+  return popen(Command, Mode);
+
+}
+
+int CloseProcessPipe(FILE *F) {
+
+  return pclose(F);
+
+}
+
+const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
+                         size_t PattLen) {
+
+  return memmem(Data, DataLen, Patt, PattLen);
+
+}
+
+std::string DisassembleCmd(const std::string &FileName) {
+
+  return "objdump -d " + FileName;
+
+}
+
+std::string SearchRegexCmd(const std::string &Regex) {
+
+  return "grep '" + Regex + "'";
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_POSIX
+
diff --git a/custom_mutators/libfuzzer/FuzzerUtilWindows.cpp b/custom_mutators/libfuzzer/FuzzerUtilWindows.cpp
new file mode 100644
index 00000000..dca5630f
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerUtilWindows.cpp
@@ -0,0 +1,279 @@
+//===- FuzzerUtilWindows.cpp - Misc utils for Windows. --------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Misc utils implementation for Windows.
+//===----------------------------------------------------------------------===//
+#include "FuzzerPlatform.h"
+#if LIBFUZZER_WINDOWS
+  #include "FuzzerCommand.h"
+  #include "FuzzerIO.h"
+  #include "FuzzerInternal.h"
+  #include <cassert>
+  #include <chrono>
+  #include <cstring>
+  #include <errno.h>
+  #include <io.h>
+  #include <iomanip>
+  #include <signal.h>
+  #include <stdio.h>
+  #include <sys/types.h>
+  #include <windows.h>
+
+  // This must be included after windows.h.
+  #include <psapi.h>
+
+namespace fuzzer {
+
+static const FuzzingOptions *HandlerOpt = nullptr;
+
+static LONG CALLBACK ExceptionHandler(PEXCEPTION_POINTERS ExceptionInfo) {
+
+  switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
+
+    case EXCEPTION_ACCESS_VIOLATION:
+    case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+    case EXCEPTION_STACK_OVERFLOW:
+      if (HandlerOpt->HandleSegv) Fuzzer::StaticCrashSignalCallback();
+      break;
+    case EXCEPTION_DATATYPE_MISALIGNMENT:
+    case EXCEPTION_IN_PAGE_ERROR:
+      if (HandlerOpt->HandleBus) Fuzzer::StaticCrashSignalCallback();
+      break;
+    case EXCEPTION_ILLEGAL_INSTRUCTION:
+    case EXCEPTION_PRIV_INSTRUCTION:
+      if (HandlerOpt->HandleIll) Fuzzer::StaticCrashSignalCallback();
+      break;
+    case EXCEPTION_FLT_DENORMAL_OPERAND:
+    case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+    case EXCEPTION_FLT_INEXACT_RESULT:
+    case EXCEPTION_FLT_INVALID_OPERATION:
+    case EXCEPTION_FLT_OVERFLOW:
+    case EXCEPTION_FLT_STACK_CHECK:
+    case EXCEPTION_FLT_UNDERFLOW:
+    case EXCEPTION_INT_DIVIDE_BY_ZERO:
+    case EXCEPTION_INT_OVERFLOW:
+      if (HandlerOpt->HandleFpe) Fuzzer::StaticCrashSignalCallback();
+      break;
+      // TODO: handle (Options.HandleXfsz)
+
+  }
+
+  return EXCEPTION_CONTINUE_SEARCH;
+
+}
+
+BOOL WINAPI CtrlHandler(DWORD dwCtrlType) {
+
+  switch (dwCtrlType) {
+
+    case CTRL_C_EVENT:
+      if (HandlerOpt->HandleInt) Fuzzer::StaticInterruptCallback();
+      return TRUE;
+    case CTRL_BREAK_EVENT:
+      if (HandlerOpt->HandleTerm) Fuzzer::StaticInterruptCallback();
+      return TRUE;
+
+  }
+
+  return FALSE;
+
+}
+
+void CALLBACK AlarmHandler(PVOID, BOOLEAN) {
+
+  Fuzzer::StaticAlarmCallback();
+
+}
+
+class TimerQ {
+
+  HANDLE TimerQueue;
+
+ public:
+  TimerQ() : TimerQueue(NULL) {
+
+  }
+
+  ~TimerQ() {
+
+    if (TimerQueue) DeleteTimerQueueEx(TimerQueue, NULL);
+
+  }
+
+  void SetTimer(int Seconds) {
+
+    if (!TimerQueue) {
+
+      TimerQueue = CreateTimerQueue();
+      if (!TimerQueue) {
+
+        Printf("libFuzzer: CreateTimerQueue failed.\n");
+        exit(1);
+
+      }
+
+    }
+
+    HANDLE Timer;
+    if (!CreateTimerQueueTimer(&Timer, TimerQueue, AlarmHandler, NULL,
+                               Seconds * 1000, Seconds * 1000, 0)) {
+
+      Printf("libFuzzer: CreateTimerQueueTimer failed.\n");
+      exit(1);
+
+    }
+
+  }
+
+};
+
+static TimerQ Timer;
+
+static void CrashHandler(int) {
+
+  Fuzzer::StaticCrashSignalCallback();
+
+}
+
+void SetSignalHandler(const FuzzingOptions &Options) {
+
+  HandlerOpt = &Options;
+
+  if (Options.HandleAlrm && Options.UnitTimeoutSec > 0)
+    Timer.SetTimer(Options.UnitTimeoutSec / 2 + 1);
+
+  if (Options.HandleInt || Options.HandleTerm)
+    if (!SetConsoleCtrlHandler(CtrlHandler, TRUE)) {
+
+      DWORD LastError = GetLastError();
+      Printf("libFuzzer: SetConsoleCtrlHandler failed (Error code: %lu).\n",
+             LastError);
+      exit(1);
+
+    }
+
+  if (Options.HandleSegv || Options.HandleBus || Options.HandleIll ||
+      Options.HandleFpe)
+    SetUnhandledExceptionFilter(ExceptionHandler);
+
+  if (Options.HandleAbrt)
+    if (SIG_ERR == signal(SIGABRT, CrashHandler)) {
+
+      Printf("libFuzzer: signal failed with %d\n", errno);
+      exit(1);
+
+    }
+
+}
+
+void SleepSeconds(int Seconds) {
+
+  Sleep(Seconds * 1000);
+
+}
+
+unsigned long GetPid() {
+
+  return GetCurrentProcessId();
+
+}
+
+size_t GetPeakRSSMb() {
+
+  PROCESS_MEMORY_COUNTERS info;
+  if (!GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info))) return 0;
+  return info.PeakWorkingSetSize >> 20;
+
+}
+
+FILE *OpenProcessPipe(const char *Command, const char *Mode) {
+
+  return _popen(Command, Mode);
+
+}
+
+int CloseProcessPipe(FILE *F) {
+
+  return _pclose(F);
+
+}
+
+int ExecuteCommand(const Command &Cmd) {
+
+  std::string CmdLine = Cmd.toString();
+  return system(CmdLine.c_str());
+
+}
+
+bool ExecuteCommand(const Command &Cmd, std::string *CmdOutput) {
+
+  FILE *Pipe = _popen(Cmd.toString().c_str(), "r");
+  if (!Pipe) return false;
+
+  if (CmdOutput) {
+
+    char TmpBuffer[128];
+    while (fgets(TmpBuffer, sizeof(TmpBuffer), Pipe))
+      CmdOutput->append(TmpBuffer);
+
+  }
+
+  return _pclose(Pipe) == 0;
+
+}
+
+const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
+                         size_t PattLen) {
+
+  // TODO: make this implementation more efficient.
+  const char *Cdata = (const char *)Data;
+  const char *Cpatt = (const char *)Patt;
+
+  if (!Data || !Patt || DataLen == 0 || PattLen == 0 || DataLen < PattLen)
+    return NULL;
+
+  if (PattLen == 1) return memchr(Data, *Cpatt, DataLen);
+
+  const char *End = Cdata + DataLen - PattLen + 1;
+
+  for (const char *It = Cdata; It < End; ++It)
+    if (It[0] == Cpatt[0] && memcmp(It, Cpatt, PattLen) == 0) return It;
+
+  return NULL;
+
+}
+
+std::string DisassembleCmd(const std::string &FileName) {
+
+  Vector<std::string> command_vector;
+  command_vector.push_back("dumpbin /summary > nul");
+  if (ExecuteCommand(Command(command_vector)) == 0)
+    return "dumpbin /disasm " + FileName;
+  Printf("libFuzzer: couldn't find tool to disassemble (dumpbin)\n");
+  exit(1);
+
+}
+
+std::string SearchRegexCmd(const std::string &Regex) {
+
+  return "findstr /r \"" + Regex + "\"";
+
+}
+
+void DiscardOutput(int Fd) {
+
+  FILE *Temp = fopen("nul", "w");
+  if (!Temp) return;
+  _dup2(_fileno(Temp), Fd);
+  fclose(Temp);
+
+}
+
+}  // namespace fuzzer
+
+#endif  // LIBFUZZER_WINDOWS
+
diff --git a/custom_mutators/libfuzzer/FuzzerValueBitMap.h b/custom_mutators/libfuzzer/FuzzerValueBitMap.h
new file mode 100644
index 00000000..ddbfe200
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerValueBitMap.h
@@ -0,0 +1,73 @@
+//===- FuzzerValueBitMap.h - INTERNAL - Bit map -----------------*- C++ -* ===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// ValueBitMap.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_VALUE_BIT_MAP_H
+#define LLVM_FUZZER_VALUE_BIT_MAP_H
+
+#include "FuzzerPlatform.h"
+#include <cstdint>
+
+namespace fuzzer {
+
+// A bit map containing kMapSizeInWords bits.
+struct ValueBitMap {
+  static const size_t kMapSizeInBits = 1 << 16;
+  static const size_t kMapPrimeMod = 65371;  // Largest Prime < kMapSizeInBits;
+  static const size_t kBitsInWord = (sizeof(uintptr_t) * 8);
+  static const size_t kMapSizeInWords = kMapSizeInBits / kBitsInWord;
+ public:
+
+  // Clears all bits.
+  void Reset() { memset(Map, 0, sizeof(Map)); }
+
+  // Computes a hash function of Value and sets the corresponding bit.
+  // Returns true if the bit was changed from 0 to 1.
+  ATTRIBUTE_NO_SANITIZE_ALL
+  inline bool AddValue(uintptr_t Value) {
+    uintptr_t Idx = Value % kMapSizeInBits;
+    uintptr_t WordIdx = Idx / kBitsInWord;
+    uintptr_t BitIdx = Idx % kBitsInWord;
+    uintptr_t Old = Map[WordIdx];
+    uintptr_t New = Old | (1ULL << BitIdx);
+    Map[WordIdx] = New;
+    return New != Old;
+  }
+
+  ATTRIBUTE_NO_SANITIZE_ALL
+  inline bool AddValueModPrime(uintptr_t Value) {
+    return AddValue(Value % kMapPrimeMod);
+  }
+
+  inline bool Get(uintptr_t Idx) {
+    assert(Idx < kMapSizeInBits);
+    uintptr_t WordIdx = Idx / kBitsInWord;
+    uintptr_t BitIdx = Idx % kBitsInWord;
+    return Map[WordIdx] & (1ULL << BitIdx);
+  }
+
+  size_t SizeInBits() const { return kMapSizeInBits; }
+
+  template <class Callback>
+  ATTRIBUTE_NO_SANITIZE_ALL
+  void ForEach(Callback CB) const {
+    for (size_t i = 0; i < kMapSizeInWords; i++)
+      if (uintptr_t M = Map[i])
+        for (size_t j = 0; j < sizeof(M) * 8; j++)
+          if (M & ((uintptr_t)1 << j))
+            CB(i * sizeof(M) * 8 + j);
+  }
+
+ private:
+  ATTRIBUTE_ALIGNED(512) uintptr_t Map[kMapSizeInWords];
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_VALUE_BIT_MAP_H
diff --git a/custom_mutators/libfuzzer/Makefile b/custom_mutators/libfuzzer/Makefile
new file mode 100644
index 00000000..f0c80392
--- /dev/null
+++ b/custom_mutators/libfuzzer/Makefile
@@ -0,0 +1,81 @@
+
+#CFLAGS = -O3 -funroll-loops -fPIC -fpermissive -std=c++11
+CFLAGS = -g -O0 -fPIC -fpermissive -std=c++11
+CC := clang++
+
+all: libfuzzer-mutator.so
+
+FuzzerCrossOver.o:	FuzzerCrossOver.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerDataFlowTrace.o:	FuzzerDataFlowTrace.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerDriver.o:	FuzzerDriver.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerExtFunctionsDlsym.o:	FuzzerExtFunctionsDlsym.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerExtFunctionsWeak.o:	FuzzerExtFunctionsWeak.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerExtFunctionsWindows.o:	FuzzerExtFunctionsWindows.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerExtraCounters.o:	FuzzerExtraCounters.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerFork.o:	FuzzerFork.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerIO.o:	FuzzerIO.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerIOPosix.o:	FuzzerIOPosix.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerIOWindows.o:	FuzzerIOWindows.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerLoop.o:	FuzzerLoop.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerMerge.o:	FuzzerMerge.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerMutate.o:	FuzzerMutate.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerSHA1.o:	FuzzerSHA1.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerTracePC.o:	FuzzerTracePC.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtil.o:	FuzzerUtil.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtilDarwin.o:	FuzzerUtilDarwin.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtilFuchsia.o:	FuzzerUtilFuchsia.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtilLinux.o:	FuzzerUtilLinux.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtilPosix.o:	FuzzerUtilPosix.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+FuzzerUtilWindows.o:	FuzzerUtilWindows.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+libfuzzer.o:	libfuzzer.cpp
+	$(CC) $(CFLAGS) -I../../include -I. -c $^
+
+libfuzzer-mutator.so:	FuzzerCrossOver.o FuzzerDataFlowTrace.o FuzzerDriver.o FuzzerExtFunctionsDlsym.o FuzzerExtFunctionsWeak.o FuzzerExtFunctionsWindows.o FuzzerExtraCounters.o FuzzerFork.o FuzzerIO.o FuzzerIOPosix.o FuzzerIOWindows.o FuzzerLoop.o FuzzerMerge.o FuzzerMutate.o FuzzerSHA1.o FuzzerTracePC.o FuzzerUtil.o FuzzerUtilDarwin.o FuzzerUtilFuchsia.o FuzzerUtilLinux.o FuzzerUtilPosix.o FuzzerUtilWindows.o libfuzzer.o
+	$(CC) $(CFLAGS) -I../../include -I. -shared -o libfuzzer-mutator.so *.o
+
+clean:
+	rm -f *.o *~ *.so core
diff --git a/custom_mutators/libfuzzer/README.md b/custom_mutators/libfuzzer/README.md
new file mode 100644
index 00000000..a773da02
--- /dev/null
+++ b/custom_mutators/libfuzzer/README.md
@@ -0,0 +1,24 @@
+# custum mutator: libfuzzer LLVMFuzzerMutate()
+
+This uses the libfuzzer LLVMFuzzerMutate() function in llvm 12.
+
+just type `make` to build
+
+```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/libfuzzer/libfuzzer-mutator.so afl-fuzz ...```
+
+Note that is is currently simple and is missing two features:
+  * Splicing ("Crossover")
+  * Dictionary support
+
+To update the source, all that is needed is that FuzzerDriver.cpp has to receive
+```
+#include "libfuzzer.inc"
+```
+before the closing namespace bracket.
+
+It is also libfuzzer.inc where the configuration of the libfuzzer mutations
+are done.
+
+> Original repository: https://github.com/llvm/llvm-project
+> Path: compiler-rt/lib/fuzzer/*.{h|cpp}
+> Source commit: d4b88ac1658d681e143482336cac27c6a74b8b24
diff --git a/custom_mutators/libfuzzer/libfuzzer.cpp b/custom_mutators/libfuzzer/libfuzzer.cpp
new file mode 100644
index 00000000..cf41af2d
--- /dev/null
+++ b/custom_mutators/libfuzzer/libfuzzer.cpp
@@ -0,0 +1,147 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+//#include "config.h"
+//#include "debug.h"
+#include "afl-fuzz.h"
+
+afl_state_t *afl_struct;
+
+extern "C" size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
+extern "C" int    LLVMFuzzerRunDriver(int *argc, char ***argv,
+                                      int (*UserCb)(const uint8_t *Data,
+                                                 size_t         Size));
+extern "C" void   LLVMFuzzerMyInit(int (*UserCb)(const uint8_t *Data,
+                                               size_t         Size),
+                                   unsigned int Seed);
+
+typedef struct my_mutator {
+
+  afl_state_t *afl;
+  u8 *         mutator_buf;
+  unsigned int seed;
+  unsigned int extras_cnt, a_extras_cnt;
+
+} my_mutator_t;
+
+extern "C" int dummy(const uint8_t *Data, size_t Size) {
+
+  (void)(Data);
+  (void)(Size);
+  fprintf(stderr, "dummy() called\n");
+  return 0;
+
+}
+
+extern "C" my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
+
+  my_mutator_t *data = (my_mutator_t *)calloc(1, sizeof(my_mutator_t));
+  if (!data) {
+
+    perror("afl_custom_init alloc");
+    return NULL;
+
+  }
+
+  if ((data->mutator_buf = (u8 *)malloc(MAX_FILE)) == NULL) {
+
+    perror("mutator_buf alloc");
+    return NULL;
+
+  }
+
+  data->afl = afl;
+  data->seed = seed;
+  afl_struct = afl;
+
+  /*
+    char **argv;
+    argv = (char**)malloc(sizeof(size_t) * 2);
+    argv[0] = (char*)"foo";
+    argv[1] = NULL;
+    int eins = 1;
+    LLVMFuzzerRunDriver(&eins, &argv, dummy);
+  */
+
+  LLVMFuzzerMyInit(dummy, seed);
+
+  return data;
+
+}
+
+/* When a new queue entry is added we check if there are new dictionary
+   entries to add to honggfuzz structure */
+#if ß
+extern "C" void afl_custom_queue_new_entry(my_mutator_t * data,
+                                           const uint8_t *filename_new_queue,
+                                           const uint8_t *filename_orig_queue) {
+
+  while (data->extras_cnt < afl_struct->extras_cnt) {
+
+    /*
+        memcpy(run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].val,
+               afl_struct->extras[data->extras_cnt].data,
+               afl_struct->extras[data->extras_cnt].len);
+        run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].len =
+            afl_struct->extras[data->extras_cnt].len;
+        run.global->mutate.dictionaryCnt++;
+    */
+    data->extras_cnt++;
+
+  }
+
+  while (data->a_extras_cnt < afl_struct->a_extras_cnt) {
+
+    /*
+        memcpy(run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].val,
+               afl_struct->a_extras[data->a_extras_cnt].data,
+               afl_struct->a_extras[data->a_extras_cnt].len);
+        run.global->mutate.dictionary[run.global->mutate.dictionaryCnt].len =
+            afl_struct->a_extras[data->a_extras_cnt].len;
+        run.global->mutate.dictionaryCnt++;
+        data->a_extras_cnt++;
+    */
+
+  }
+
+}
+
+#endif
+/* we could set only_printable if is_ascii is set ... let's see
+uint8_t afl_custom_queue_get(void *data, const uint8_t *filename) {
+
+  //run.global->cfg.only_printable = ...
+
+}
+
+*/
+
+/* here we run the honggfuzz mutator, which is really good */
+
+extern "C" size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf,
+                                  size_t buf_size, u8 **out_buf,
+                                  uint8_t *add_buf, size_t add_buf_size,
+                                  size_t max_size) {
+
+  memcpy(data->mutator_buf, buf, buf_size);
+  size_t ret = LLVMFuzzerMutate(data->mutator_buf, buf_size, max_size);
+
+  /* return size of mutated data */
+  *out_buf = data->mutator_buf;
+  return ret;
+
+}
+
+/**
+ * Deinitialize everything
+ *
+ * @param data The data ptr from afl_custom_init
+ */
+extern "C" void afl_custom_deinit(my_mutator_t *data) {
+
+  free(data->mutator_buf);
+  free(data);
+
+}
+
diff --git a/custom_mutators/libfuzzer/libfuzzer.inc b/custom_mutators/libfuzzer/libfuzzer.inc
new file mode 100644
index 00000000..01f21dbe
--- /dev/null
+++ b/custom_mutators/libfuzzer/libfuzzer.inc
@@ -0,0 +1,36 @@
+
+
+extern "C" ATTRIBUTE_INTERFACE void
+LLVMFuzzerMyInit(int (*Callback)(const uint8_t *Data, size_t Size), unsigned int Seed) {
+  Random Rand(Seed);
+  FuzzingOptions Options;
+  Options.Verbosity = 3;
+  Options.MaxLen = 1024000;
+  Options.LenControl = true;
+  Options.DoCrossOver = false;
+  Options.MutateDepth = 6;
+  Options.UseCounters = false;
+  Options.UseMemmem = false;
+  Options.UseCmp = false;
+  Options.UseValueProfile = false;
+  Options.Shrink = false;
+  Options.ReduceInputs = false;
+  Options.PreferSmall = false;
+  Options.ReloadIntervalSec = 0;
+  Options.OnlyASCII = false;
+  Options.DetectLeaks = false;
+  Options.PurgeAllocatorIntervalSec = 0;
+  Options.TraceMalloc = false;
+  Options.RssLimitMb = 100;
+  Options.MallocLimitMb = 100;
+  Options.MaxNumberOfRuns = 0;
+  Options.ReportSlowUnits = false;
+  Options.Entropic = false;
+  
+  struct EntropicOptions Entropic;
+  Entropic.Enabled = Options.Entropic;
+  EF = new ExternalFunctions();
+  auto *MD = new MutationDispatcher(Rand, Options);
+  auto *Corpus = new InputCorpus(Options.OutputCorpus, Entropic);
+  auto *F = new Fuzzer(Callback, *Corpus, *MD, Options);
+}
diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index d0572f4e..6f14052f 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -12,7 +12,8 @@ afl_state_t *afl_struct;
 #ifdef DEBUG
   #define DBG(x...) fprintf(stderr, x)
 #else
-  #define DBG(x...) {}
+  #define DBG(x...) \
+    {}
 #endif
 
 typedef struct my_mutator {
@@ -177,8 +178,8 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
                        size_t max_size) {
 
   struct dirent **nl;
-  int32_t i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
-  size_t  size = 0;
+  int32_t         i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
+  size_t          size = 0;
 
   if (items <= 0) return 0;
 
diff --git a/docs/Changelog.md b/docs/Changelog.md
index 1e5c1b95..af52b955 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -33,6 +33,8 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
     - LTO autodict now also collects interesting cmp comparisons,
       std::string compare + find + ==, bcmp
   - added a new custom mutator: symcc -> https://github.com/eurecom-s3/symcc/
+  - added a new custom mutator: libfuzzer that integrates libfuzzer mutations
+  - Our afl++ Grammar-Mutator is now better integrated into custom_mutators/
 
 
 ### Version ++2.68c (release)
diff --git a/include/afl-prealloc.h b/include/afl-prealloc.h
index edf69a67..fa6c9b70 100644
--- a/include/afl-prealloc.h
+++ b/include/afl-prealloc.h
@@ -60,7 +60,7 @@ typedef enum prealloc_status {
                                                                                \
     if ((prealloc_counter) >= (prealloc_size)) {                               \
                                                                                \
-      el_ptr = (void *)malloc(sizeof(*el_ptr));                                \
+      el_ptr = (element_t *)malloc(sizeof(*el_ptr));                           \
       if (!el_ptr) { FATAL("error in list.h -> out of memory for element!"); } \
       el_ptr->pre_status = PRE_STATUS_MALLOC;                                  \
                                                                                \
diff --git a/include/alloc-inl.h b/include/alloc-inl.h
index 90701d18..36e47810 100644
--- a/include/alloc-inl.h
+++ b/include/alloc-inl.h
@@ -668,7 +668,7 @@ static inline void *afl_realloc(void **buf, size_t size_needed) {
   if (likely(*buf)) {
 
     /* the size is always stored at buf - 1*size_t */
-    new_buf = afl_alloc_bufptr(*buf);
+    new_buf = (struct afl_alloc_buf *)afl_alloc_bufptr(*buf);
     current_size = new_buf->complete_size;
 
   }
@@ -694,7 +694,7 @@ static inline void *afl_realloc(void **buf, size_t size_needed) {
   }
 
   /* alloc */
-  new_buf = realloc(new_buf, next_size);
+  new_buf = (struct afl_alloc_buf *)realloc(new_buf, next_size);
   if (unlikely(!new_buf)) {
 
     *buf = NULL;
diff --git a/include/list.h b/include/list.h
index 88cbe062..7ec81cbe 100644
--- a/include/list.h
+++ b/include/list.h
@@ -81,6 +81,7 @@ static inline void list_append(list_t *list, void *el) {
   }
 
   element_t *el_box = NULL;
+
   PRE_ALLOC(el_box, list->element_prealloc_buf, LIST_PREALLOC_SIZE,
             list->element_prealloc_count);
   if (!el_box) { FATAL("failed to allocate list element"); }
diff --git a/src/afl-cc.c b/src/afl-cc.c
index 6bee8b38..a00b240d 100644
--- a/src/afl-cc.c
+++ b/src/afl-cc.c
@@ -1508,9 +1508,9 @@ int main(int argc, char **argv, char **envp) {
 
   if (debug) {
 
-    SAYF(cMGN "[D]" cRST " cd \"%s\";", getthecwd());
+    SAYF(cMGN "[D]" cRST " cd '%s';", getthecwd());
     for (i = 0; i < argc; i++)
-      SAYF(" \"%s\"", argv[i]);
+      SAYF(" '%s'", argv[i]);
     SAYF("\n");
 
   }
@@ -1536,9 +1536,9 @@ int main(int argc, char **argv, char **envp) {
 
   if (debug) {
 
-    SAYF(cMGN "[D]" cRST " cd \"%s\";", getthecwd());
+    SAYF(cMGN "[D]" cRST " cd '%s';", getthecwd());
     for (i = 0; i < cc_par_cnt; i++)
-      SAYF(" \"%s\"", cc_params[i]);
+      SAYF(" '%s'", cc_params[i]);
     SAYF("\n");
 
   }
-- 
cgit 1.4.1


From 862b6d0382a132cc5338cfdcdc2c30c2cd8d578b Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Fri, 11 Sep 2020 08:56:28 +0200
Subject: fix for afl-compiler-rt to only send dictionary data if there is some

---
 custom_mutators/libfuzzer/FuzzerDriver.cpp         |  2 +-
 .../libfuzzer/FuzzerExtFunctionsDlsym.cpp          |  4 ++--
 .../libfuzzer/FuzzerExtFunctionsWeak.cpp           |  7 +++----
 .../libfuzzer/FuzzerExtFunctionsWindows.cpp        | 23 +++++++++++-----------
 instrumentation/afl-compiler-rt.o.c                |  6 ++++--
 5 files changed, 22 insertions(+), 20 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerDriver.cpp b/custom_mutators/libfuzzer/FuzzerDriver.cpp
index 9a0a32b0..6468a02e 100644
--- a/custom_mutators/libfuzzer/FuzzerDriver.cpp
+++ b/custom_mutators/libfuzzer/FuzzerDriver.cpp
@@ -77,7 +77,7 @@ struct {
 } Flags;
 
 static const FlagDescription FlagDescriptions[]{
-\
+
 #define FUZZER_DEPRECATED_FLAG(Name) \
   {#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr},
 #define FUZZER_FLAG_INT(Name, Default, Description) \
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
index 8009b237..4a4d58fc 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
@@ -45,8 +45,8 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
-    this->NAME = GetFnPtr<decltype(ExternalFunctions::NAME)>(#NAME, WARN)
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME =
+      GetFnPtr < decltype(ExternalFunctions::NAME)>(#NAME, WARN)
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
index c7a1d05e..bbd8f3ba 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
@@ -46,10 +46,9 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                         \
-    this->NAME = ::NAME;                                                      \
-    CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
-               #NAME, WARN);
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME = ::NAME;
+  CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)),
+             #NAME, WARN);
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
index a727220a..d79421cd 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
@@ -45,15 +45,16 @@ using namespace fuzzer;
   #endif  // LIBFUZZER_MSVC
 
 extern "C" {
-\
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)         \
-    RETURN_TYPE NAME##Def FUNC_SIG {                          \
-                                                              \
-      Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
-      exit(1);                                                \
-                                                              \
-    }                                                         \
-    EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
+
+#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)
+    RETURN_TYPE NAME##Def FUNC_SIG {
+
+  Printf("ERROR: Function \"%s\" not defined.\n", #NAME);
+  exit(1);
+
+}
+
+EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
 
   #include "FuzzerExtFunctions.def"
 
@@ -80,8 +81,8 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
-    this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME =
+      GetFnPtr < decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/instrumentation/afl-compiler-rt.o.c b/instrumentation/afl-compiler-rt.o.c
index 0e8b97a2..209cc726 100644
--- a/instrumentation/afl-compiler-rt.o.c
+++ b/instrumentation/afl-compiler-rt.o.c
@@ -469,7 +469,8 @@ static void __afl_start_snapshots(void) {
     }
 
     if ((was_killed & (FS_OPT_ENABLED | FS_OPT_AUTODICT)) ==
-        (FS_OPT_ENABLED | FS_OPT_AUTODICT)) {
+            (FS_OPT_ENABLED | FS_OPT_AUTODICT) &&
+        __afl_dictionary_len && __afl_dictionary) {
 
       // great lets pass the dictionary through the forkserver FD
       u32 len = __afl_dictionary_len, offset = 0;
@@ -681,7 +682,8 @@ static void __afl_start_forkserver(void) {
     }
 
     if ((was_killed & (FS_OPT_ENABLED | FS_OPT_AUTODICT)) ==
-        (FS_OPT_ENABLED | FS_OPT_AUTODICT)) {
+            (FS_OPT_ENABLED | FS_OPT_AUTODICT) &&
+        __afl_dictionary_len && __afl_dictionary) {
 
       // great lets pass the dictionary through the forkserver FD
       u32 len = __afl_dictionary_len, offset = 0;
-- 
cgit 1.4.1


From 7f94fe358702faa906574cac402875ef6ba3ccb3 Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Sun, 13 Sep 2020 14:26:57 +0200
Subject: code format

---
 custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp    | 2 +-
 custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp | 4 ++--
 instrumentation/afl-gcc-pass.so.cc                      | 9 +++++----
 3 files changed, 8 insertions(+), 7 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
index bbd8f3ba..caf1a7ef 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
@@ -48,7 +48,7 @@ ExternalFunctions::ExternalFunctions() {
 \
   #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME = ::NAME;
   CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)),
-             #NAME, WARN);
+  #NAME, WARN);
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
index d79421cd..630f352d 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
@@ -46,8 +46,8 @@ using namespace fuzzer;
 
 extern "C" {
 
-#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)
-    RETURN_TYPE NAME##Def FUNC_SIG {
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)
+RETURN_TYPE NAME##Def FUNC_SIG {
 
   Printf("ERROR: Function \"%s\" not defined.\n", #NAME);
   exit(1);
diff --git a/instrumentation/afl-gcc-pass.so.cc b/instrumentation/afl-gcc-pass.so.cc
index 52304832..04d606cc 100644
--- a/instrumentation/afl-gcc-pass.so.cc
+++ b/instrumentation/afl-gcc-pass.so.cc
@@ -159,8 +159,9 @@
 #include <gimple-iterator.h>
 #include <stringpool.h>
 #include <gimple-ssa.h>
-#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 60200 /* >= version 6.2.0 */
-#include <tree-vrp.h>
+#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \
+    60200                                               /* >= version 6.2.0 */
+  #include <tree-vrp.h>
 #endif
 #include <tree-ssanames.h>
 #include <tree-phinodes.h>
@@ -334,12 +335,12 @@ struct afl_pass : gimple_opt_pass {
           gimple_seq_add_stmt(&seq, add1_cntr);
 
           /* Extract the real part into count.  */
-          tree    cntrb = build1(REALPART_EXPR, TREE_TYPE(cntr), xaddc);
+          tree cntrb = build1(REALPART_EXPR, TREE_TYPE(cntr), xaddc);
           auto xtrct_cntr = gimple_build_assign(cntr, cntrb);
           gimple_seq_add_stmt(&seq, xtrct_cntr);
 
           /* Extract the imaginary part into xincr.  */
-          tree    incrb = build1(IMAGPART_EXPR, TREE_TYPE(xincr), xaddc);
+          tree incrb = build1(IMAGPART_EXPR, TREE_TYPE(xincr), xaddc);
           auto xtrct_xincr = gimple_build_assign(xincr, incrb);
           gimple_seq_add_stmt(&seq, xtrct_xincr);
 
-- 
cgit 1.4.1


From 5f52f72761fd6bcb2cd9c97fb1cd3a6f05f28ccd Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Sun, 20 Sep 2020 14:58:08 +0200
Subject: set explore as default, fix schedule display

---
 custom_mutators/libfuzzer/Makefile | 2 +-
 src/afl-fuzz-state.c               | 8 ++++----
 src/afl-fuzz.c                     | 9 +++++----
 3 files changed, 10 insertions(+), 9 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/Makefile b/custom_mutators/libfuzzer/Makefile
index f0c80392..34a358ac 100644
--- a/custom_mutators/libfuzzer/Makefile
+++ b/custom_mutators/libfuzzer/Makefile
@@ -1,7 +1,7 @@
 
 #CFLAGS = -O3 -funroll-loops -fPIC -fpermissive -std=c++11
 CFLAGS = -g -O0 -fPIC -fpermissive -std=c++11
-CC := clang++
+CC ?= clang++
 
 all: libfuzzer-mutator.so
 
diff --git a/src/afl-fuzz-state.c b/src/afl-fuzz-state.c
index 4e817843..ae45d571 100644
--- a/src/afl-fuzz-state.c
+++ b/src/afl-fuzz-state.c
@@ -30,9 +30,9 @@ s8  interesting_8[] = {INTERESTING_8};
 s16 interesting_16[] = {INTERESTING_8, INTERESTING_16};
 s32 interesting_32[] = {INTERESTING_8, INTERESTING_16, INTERESTING_32};
 
-char *power_names[POWER_SCHEDULES_NUM] = {"explore", "exploit", "fast",
-                                          "coe",     "lin",     "quad",
-                                          "rare",    "mmopt",   "seek"};
+char *power_names[POWER_SCHEDULES_NUM] = {"explore", "mmopt", "exploit",
+                                          "fast",    "coe",   "lin",
+                                          "quad",    "rare",  "seek"};
 
 /* Initialize MOpt "globals" for this afl state */
 
@@ -87,7 +87,7 @@ void afl_state_init(afl_state_t *afl, uint32_t map_size) {
   afl->w_end = 0.3;
   afl->g_max = 5000;
   afl->period_pilot_tmp = 5000.0;
-  afl->schedule = SEEK;                   /* Power schedule (default: SEEK) */
+  afl->schedule = EXPLORE;             /* Power schedule (default: EXPLORE) */
   afl->havoc_max_mult = HAVOC_MAX_MULT;
 
   afl->clear_screen = 1;                /* Window resized?                  */
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index 8cfd79e2..002be0be 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -90,7 +90,7 @@ static void usage(u8 *argv0, int more_help) {
 
       "Execution control settings:\n"
       "  -p schedule   - power schedules compute a seed's performance score:\n"
-      "                  <seek (default), explore, rare, exploit, mmopt, coe, "
+      "                  <explore(default), rare, exploit, seek, mmopt, coe, "
       "fast,\n"
       "                  lin, quad> -- see docs/power_schedules.md\n"
       "  -f file       - location read by the fuzzed program (default: stdin "
@@ -246,7 +246,8 @@ int main(int argc, char **argv_orig, char **envp) {
   u64 prev_queued = 0;
   u32 sync_interval_cnt = 0, seek_to, show_help = 0, map_size = MAP_SIZE;
   u8 *extras_dir[4];
-  u8 mem_limit_given = 0, exit_1 = 0, debug = 0, extras_dir_cnt = 0/*, have_p = 0*/;
+  u8  mem_limit_given = 0, exit_1 = 0, debug = 0,
+     extras_dir_cnt = 0 /*, have_p = 0*/;
   char **use_argv;
 
   struct timeval  tv;
@@ -364,7 +365,7 @@ int main(int argc, char **argv_orig, char **envp) {
 
         }
 
-        //have_p = 1;
+        // have_p = 1;
 
         break;
 
@@ -1366,7 +1367,7 @@ int main(int argc, char **argv_orig, char **envp) {
               afl->expand_havoc = 2;
               break;
             case 2:
-              //if (!have_p) afl->schedule = EXPLOIT;
+              // if (!have_p) afl->schedule = EXPLOIT;
               afl->expand_havoc = 3;
               break;
             case 3:
-- 
cgit 1.4.1


From 207cbd5cf7c1956969f42e89bfcb9a0ab451e351 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Mon, 21 Sep 2020 15:47:10 +0200
Subject: fix and update libfuzzer custom mutator

---
 custom_mutators/libfuzzer/FuzzerDriver.cpp         |  19 +-
 .../libfuzzer/FuzzerExtFunctionsDlsym.cpp          |   4 +-
 .../libfuzzer/FuzzerExtFunctionsWeak.cpp           |   7 +-
 .../libfuzzer/FuzzerExtFunctionsWindows.cpp        |  23 +-
 custom_mutators/libfuzzer/FuzzerFlags.def          |   5 +-
 custom_mutators/libfuzzer/FuzzerInterceptors.cpp   | 290 +++++++++++++++++++++
 custom_mutators/libfuzzer/FuzzerLoop.cpp           |   2 +-
 custom_mutators/libfuzzer/FuzzerMain.cpp           |  26 ++
 custom_mutators/libfuzzer/FuzzerMutate.cpp         |  19 +-
 custom_mutators/libfuzzer/FuzzerMutate.h           |   5 +-
 custom_mutators/libfuzzer/FuzzerOptions.h          |   2 +-
 custom_mutators/libfuzzer/Makefile                 |  54 ++--
 custom_mutators/libfuzzer/README.md                |   2 +-
 custom_mutators/libfuzzer/libfuzzer.cpp            |   2 +-
 14 files changed, 387 insertions(+), 73 deletions(-)
 create mode 100644 custom_mutators/libfuzzer/FuzzerInterceptors.cpp
 create mode 100644 custom_mutators/libfuzzer/FuzzerMain.cpp

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerDriver.cpp b/custom_mutators/libfuzzer/FuzzerDriver.cpp
index 6468a02e..c79278bd 100644
--- a/custom_mutators/libfuzzer/FuzzerDriver.cpp
+++ b/custom_mutators/libfuzzer/FuzzerDriver.cpp
@@ -77,7 +77,7 @@ struct {
 } Flags;
 
 static const FlagDescription FlagDescriptions[]{
-
+\
 #define FUZZER_DEPRECATED_FLAG(Name) \
   {#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr},
 #define FUZZER_FLAG_INT(Name, Default, Description) \
@@ -941,23 +941,12 @@ int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
   Options.EntropicNumberOfRarestFeatures =
       (size_t)Flags.entropic_number_of_rarest_features;
   Options.EntropicScalePerExecTime = Flags.entropic_scale_per_exec_time;
-  if (Options.Entropic) {
-
-    if (!Options.FocusFunction.empty()) {
-
-      Printf(
-          "ERROR: The parameters `--entropic` and `--focus_function` cannot "
-          "be used together.\n");
-      exit(1);
-
-    }
-
+  if (!Options.FocusFunction.empty())
+    Options.Entropic = false;  // FocusFunction overrides entropic scheduling.
+  if (Options.Entropic)
     Printf("INFO: Running with entropic power schedule (0x%X, %d).\n",
            Options.EntropicFeatureFrequencyThreshold,
            Options.EntropicNumberOfRarestFeatures);
-
-  }
-
   struct EntropicOptions Entropic;
   Entropic.Enabled = Options.Entropic;
   Entropic.FeatureFrequencyThreshold =
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
index 4a4d58fc..8009b237 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsDlsym.cpp
@@ -45,8 +45,8 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME =
-      GetFnPtr < decltype(ExternalFunctions::NAME)>(#NAME, WARN)
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+    this->NAME = GetFnPtr<decltype(ExternalFunctions::NAME)>(#NAME, WARN)
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
index caf1a7ef..c7a1d05e 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWeak.cpp
@@ -46,9 +46,10 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME = ::NAME;
-  CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)),
-  #NAME, WARN);
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                         \
+    this->NAME = ::NAME;                                                      \
+    CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
+               #NAME, WARN);
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
index 630f352d..a727220a 100644
--- a/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
+++ b/custom_mutators/libfuzzer/FuzzerExtFunctionsWindows.cpp
@@ -45,16 +45,15 @@ using namespace fuzzer;
   #endif  // LIBFUZZER_MSVC
 
 extern "C" {
-
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)
-RETURN_TYPE NAME##Def FUNC_SIG {
-
-  Printf("ERROR: Function \"%s\" not defined.\n", #NAME);
-  exit(1);
-
-}
-
-EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
+\
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)         \
+    RETURN_TYPE NAME##Def FUNC_SIG {                          \
+                                                              \
+      Printf("ERROR: Function \"%s\" not defined.\n", #NAME); \
+      exit(1);                                                \
+                                                              \
+    }                                                         \
+    EXTERNAL_FUNC(NAME, NAME##Def) RETURN_TYPE NAME FUNC_SIG
 
   #include "FuzzerExtFunctions.def"
 
@@ -81,8 +80,8 @@ namespace fuzzer {
 
 ExternalFunctions::ExternalFunctions() {
 \
-  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) this->NAME =
-      GetFnPtr < decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
+  #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
+    this->NAME = GetFnPtr<decltype(::NAME)>(::NAME, ::NAME##Def, #NAME, WARN);
 
   #include "FuzzerExtFunctions.def"
 
diff --git a/custom_mutators/libfuzzer/FuzzerFlags.def b/custom_mutators/libfuzzer/FuzzerFlags.def
index c9a787e0..4d4841b1 100644
--- a/custom_mutators/libfuzzer/FuzzerFlags.def
+++ b/custom_mutators/libfuzzer/FuzzerFlags.def
@@ -171,8 +171,9 @@ FUZZER_FLAG_INT(ignore_remaining_args, 0, "If 1, ignore all arguments passed "
 FUZZER_FLAG_STRING(focus_function, "Experimental. "
      "Fuzzing will focus on inputs that trigger calls to this function. "
      "If -focus_function=auto and -data_flow_trace is used, libFuzzer "
-     "will choose the focus functions automatically.")
-FUZZER_FLAG_INT(entropic, 0, "Experimental. Enables entropic power schedule.")
+     "will choose the focus functions automatically. Disables -entropic when "
+     "specified.")
+FUZZER_FLAG_INT(entropic, 1, "Enables entropic power schedule.")
 FUZZER_FLAG_INT(entropic_feature_frequency_threshold, 0xFF, "Experimental. If "
      "entropic is enabled, all features which are observed less often than "
      "the specified value are considered as rare.")
diff --git a/custom_mutators/libfuzzer/FuzzerInterceptors.cpp b/custom_mutators/libfuzzer/FuzzerInterceptors.cpp
new file mode 100644
index 00000000..442ab79a
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerInterceptors.cpp
@@ -0,0 +1,290 @@
+//===-- FuzzerInterceptors.cpp --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Intercept certain libc functions to aid fuzzing.
+// Linked only when other RTs that define their own interceptors are not linked.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerPlatform.h"
+
+#if LIBFUZZER_LINUX
+
+  #define GET_CALLER_PC() __builtin_return_address(0)
+
+  #define PTR_TO_REAL(x) real_##x
+  #define REAL(x) __interception::PTR_TO_REAL(x)
+  #define FUNC_TYPE(x) x##_type
+  #define DEFINE_REAL(ret_type, func, ...)            \
+    typedef ret_type (*FUNC_TYPE(func))(__VA_ARGS__); \
+    namespace __interception {                        \
+                                                      \
+    FUNC_TYPE(func) PTR_TO_REAL(func);                \
+                                                      \
+    }
+
+  #include <cassert>
+  #include <cstdint>
+  #include <dlfcn.h>  // for dlsym()
+
+static void *getFuncAddr(const char *name, uintptr_t wrapper_addr) {
+
+  void *addr = dlsym(RTLD_NEXT, name);
+  if (!addr) {
+
+    // If the lookup using RTLD_NEXT failed, the sanitizer runtime library is
+    // later in the library search order than the DSO that we are trying to
+    // intercept, which means that we cannot intercept this function. We still
+    // want the address of the real definition, though, so look it up using
+    // RTLD_DEFAULT.
+    addr = dlsym(RTLD_DEFAULT, name);
+
+    // In case `name' is not loaded, dlsym ends up finding the actual wrapper.
+    // We don't want to intercept the wrapper and have it point to itself.
+    if (reinterpret_cast<uintptr_t>(addr) == wrapper_addr) addr = nullptr;
+
+  }
+
+  return addr;
+
+}
+
+static int  FuzzerInited = 0;
+static bool FuzzerInitIsRunning;
+
+static void fuzzerInit();
+
+static void ensureFuzzerInited() {
+
+  assert(!FuzzerInitIsRunning);
+  if (!FuzzerInited) { fuzzerInit(); }
+
+}
+
+static int internal_strcmp_strncmp(const char *s1, const char *s2, bool strncmp,
+                                   size_t n) {
+
+  size_t i = 0;
+  while (true) {
+
+    if (strncmp) {
+
+      if (i == n) break;
+      i++;
+
+    }
+
+    unsigned c1 = *s1;
+    unsigned c2 = *s2;
+    if (c1 != c2) return (c1 < c2) ? -1 : 1;
+    if (c1 == 0) break;
+    s1++;
+    s2++;
+
+  }
+
+  return 0;
+
+}
+
+static int internal_strncmp(const char *s1, const char *s2, size_t n) {
+
+  return internal_strcmp_strncmp(s1, s2, true, n);
+
+}
+
+static int internal_strcmp(const char *s1, const char *s2) {
+
+  return internal_strcmp_strncmp(s1, s2, false, 0);
+
+}
+
+static int internal_memcmp(const void *s1, const void *s2, size_t n) {
+
+  const uint8_t *t1 = static_cast<const uint8_t *>(s1);
+  const uint8_t *t2 = static_cast<const uint8_t *>(s2);
+  for (size_t i = 0; i < n; ++i, ++t1, ++t2)
+    if (*t1 != *t2) return *t1 < *t2 ? -1 : 1;
+  return 0;
+
+}
+
+static size_t internal_strlen(const char *s) {
+
+  size_t i = 0;
+  while (s[i])
+    i++;
+  return i;
+
+}
+
+static char *internal_strstr(const char *haystack, const char *needle) {
+
+  // This is O(N^2), but we are not using it in hot places.
+  size_t len1 = internal_strlen(haystack);
+  size_t len2 = internal_strlen(needle);
+  if (len1 < len2) return nullptr;
+  for (size_t pos = 0; pos <= len1 - len2; pos++) {
+
+    if (internal_memcmp(haystack + pos, needle, len2) == 0)
+      return const_cast<char *>(haystack) + pos;
+
+  }
+
+  return nullptr;
+
+}
+
+extern "C" {
+
+// Weak hooks forward-declared to avoid dependency on
+// <sanitizer/common_interface_defs.h>.
+void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1,
+                                  const void *s2, size_t n, int result);
+void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1,
+                                   const char *s2, size_t n, int result);
+void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
+                                       const char *s2, size_t n, int result);
+void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1,
+                                  const char *s2, int result);
+void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
+                                      const char *s2, int result);
+void __sanitizer_weak_hook_strstr(void *called_pc, const char *s1,
+                                  const char *s2, char *result);
+void __sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1,
+                                      const char *s2, char *result);
+void __sanitizer_weak_hook_memmem(void *called_pc, const void *s1, size_t len1,
+                                  const void *s2, size_t len2, void *result);
+
+DEFINE_REAL(int, bcmp, const void *, const void *, size_t)
+DEFINE_REAL(int, memcmp, const void *, const void *, size_t)
+DEFINE_REAL(int, strncmp, const char *, const char *, size_t)
+DEFINE_REAL(int, strcmp, const char *, const char *)
+DEFINE_REAL(int, strncasecmp, const char *, const char *, size_t)
+DEFINE_REAL(int, strcasecmp, const char *, const char *)
+DEFINE_REAL(char *, strstr, const char *, const char *)
+DEFINE_REAL(char *, strcasestr, const char *, const char *)
+DEFINE_REAL(void *, memmem, const void *, size_t, const void *, size_t)
+
+ATTRIBUTE_INTERFACE int bcmp(const char *s1, const char *s2, size_t n) {
+
+  if (!FuzzerInited) return internal_memcmp(s1, s2, n);
+  int result = REAL(bcmp)(s1, s2, n);
+  __sanitizer_weak_hook_memcmp(GET_CALLER_PC(), s1, s2, n, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE int memcmp(const void *s1, const void *s2, size_t n) {
+
+  if (!FuzzerInited) return internal_memcmp(s1, s2, n);
+  int result = REAL(memcmp)(s1, s2, n);
+  __sanitizer_weak_hook_memcmp(GET_CALLER_PC(), s1, s2, n, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE int strncmp(const char *s1, const char *s2, size_t n) {
+
+  if (!FuzzerInited) return internal_strncmp(s1, s2, n);
+  int result = REAL(strncmp)(s1, s2, n);
+  __sanitizer_weak_hook_strncmp(GET_CALLER_PC(), s1, s2, n, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE int strcmp(const char *s1, const char *s2) {
+
+  if (!FuzzerInited) return internal_strcmp(s1, s2);
+  int result = REAL(strcmp)(s1, s2);
+  __sanitizer_weak_hook_strcmp(GET_CALLER_PC(), s1, s2, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE int strncasecmp(const char *s1, const char *s2, size_t n) {
+
+  ensureFuzzerInited();
+  int result = REAL(strncasecmp)(s1, s2, n);
+  __sanitizer_weak_hook_strncasecmp(GET_CALLER_PC(), s1, s2, n, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE int strcasecmp(const char *s1, const char *s2) {
+
+  ensureFuzzerInited();
+  int result = REAL(strcasecmp)(s1, s2);
+  __sanitizer_weak_hook_strcasecmp(GET_CALLER_PC(), s1, s2, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE char *strstr(const char *s1, const char *s2) {
+
+  if (!FuzzerInited) return internal_strstr(s1, s2);
+  char *result = REAL(strstr)(s1, s2);
+  __sanitizer_weak_hook_strstr(GET_CALLER_PC(), s1, s2, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE char *strcasestr(const char *s1, const char *s2) {
+
+  ensureFuzzerInited();
+  char *result = REAL(strcasestr)(s1, s2);
+  __sanitizer_weak_hook_strcasestr(GET_CALLER_PC(), s1, s2, result);
+  return result;
+
+}
+
+ATTRIBUTE_INTERFACE
+void *memmem(const void *s1, size_t len1, const void *s2, size_t len2) {
+
+  ensureFuzzerInited();
+  void *result = REAL(memmem)(s1, len1, s2, len2);
+  __sanitizer_weak_hook_memmem(GET_CALLER_PC(), s1, len1, s2, len2, result);
+  return result;
+
+}
+
+__attribute__((section(".preinit_array"),
+               used)) static void (*__local_fuzzer_preinit)(void) = fuzzerInit;
+
+}  // extern "C"
+
+static void fuzzerInit() {
+
+  assert(!FuzzerInitIsRunning);
+  if (FuzzerInited) return;
+  FuzzerInitIsRunning = true;
+
+  REAL(bcmp) = reinterpret_cast<memcmp_type>(
+      getFuncAddr("bcmp", reinterpret_cast<uintptr_t>(&bcmp)));
+  REAL(memcmp) = reinterpret_cast<memcmp_type>(
+      getFuncAddr("memcmp", reinterpret_cast<uintptr_t>(&memcmp)));
+  REAL(strncmp) = reinterpret_cast<strncmp_type>(
+      getFuncAddr("strncmp", reinterpret_cast<uintptr_t>(&strncmp)));
+  REAL(strcmp) = reinterpret_cast<strcmp_type>(
+      getFuncAddr("strcmp", reinterpret_cast<uintptr_t>(&strcmp)));
+  REAL(strncasecmp) = reinterpret_cast<strncasecmp_type>(
+      getFuncAddr("strncasecmp", reinterpret_cast<uintptr_t>(&strncasecmp)));
+  REAL(strcasecmp) = reinterpret_cast<strcasecmp_type>(
+      getFuncAddr("strcasecmp", reinterpret_cast<uintptr_t>(&strcasecmp)));
+  REAL(strstr) = reinterpret_cast<strstr_type>(
+      getFuncAddr("strstr", reinterpret_cast<uintptr_t>(&strstr)));
+  REAL(strcasestr) = reinterpret_cast<strcasestr_type>(
+      getFuncAddr("strcasestr", reinterpret_cast<uintptr_t>(&strcasestr)));
+  REAL(memmem) = reinterpret_cast<memmem_type>(
+      getFuncAddr("memmem", reinterpret_cast<uintptr_t>(&memmem)));
+
+  FuzzerInitIsRunning = false;
+  FuzzerInited = 1;
+
+}
+
+#endif
+
diff --git a/custom_mutators/libfuzzer/FuzzerLoop.cpp b/custom_mutators/libfuzzer/FuzzerLoop.cpp
index 49187b30..201883f0 100644
--- a/custom_mutators/libfuzzer/FuzzerLoop.cpp
+++ b/custom_mutators/libfuzzer/FuzzerLoop.cpp
@@ -752,7 +752,7 @@ void Fuzzer::PrintStatusForNewUnit(const Unit &U, const char *Text) {
   if (Options.Verbosity) {
 
     Printf(" L: %zd/%zd ", U.size(), Corpus.MaxInputSize());
-    MD.PrintMutationSequence();
+    MD.PrintMutationSequence(Options.Verbosity >= 2);
     Printf("\n");
 
   }
diff --git a/custom_mutators/libfuzzer/FuzzerMain.cpp b/custom_mutators/libfuzzer/FuzzerMain.cpp
new file mode 100644
index 00000000..b02c88e9
--- /dev/null
+++ b/custom_mutators/libfuzzer/FuzzerMain.cpp
@@ -0,0 +1,26 @@
+//===- FuzzerMain.cpp - main() function and flags -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// main() and flags.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#include "FuzzerPlatform.h"
+
+extern "C" {
+
+// This function should be defined by the user.
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+
+}  // extern "C"
+
+ATTRIBUTE_INTERFACE int main(int argc, char **argv) {
+
+  return fuzzer::FuzzerDriver(&argc, &argv, LLVMFuzzerTestOneInput);
+
+}
+
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.cpp b/custom_mutators/libfuzzer/FuzzerMutate.cpp
index 8faf6918..eebae39b 100644
--- a/custom_mutators/libfuzzer/FuzzerMutate.cpp
+++ b/custom_mutators/libfuzzer/FuzzerMutate.cpp
@@ -17,7 +17,8 @@
 
 namespace fuzzer {
 
-const size_t Dictionary::kMaxDictSize;
+const size_t        Dictionary::kMaxDictSize;
+static const size_t kMaxMutationsToPrint = 10;
 
 static void PrintASCII(const Word &W, const char *PrintAfter) {
 
@@ -608,18 +609,24 @@ void MutationDispatcher::PrintRecommendedDictionary() {
 
 }
 
-void MutationDispatcher::PrintMutationSequence() {
+void MutationDispatcher::PrintMutationSequence(bool Verbose) {
 
   Printf("MS: %zd ", CurrentMutatorSequence.size());
-  for (auto M : CurrentMutatorSequence)
-    Printf("%s-", M.Name);
+  size_t EntriesToPrint =
+      Verbose ? CurrentMutatorSequence.size()
+              : std::min(kMaxMutationsToPrint, CurrentMutatorSequence.size());
+  for (size_t i = 0; i < EntriesToPrint; i++)
+    Printf("%s-", CurrentMutatorSequence[i].Name);
   if (!CurrentDictionaryEntrySequence.empty()) {
 
     Printf(" DE: ");
-    for (auto DE : CurrentDictionaryEntrySequence) {
+    EntriesToPrint = Verbose ? CurrentDictionaryEntrySequence.size()
+                             : std::min(kMaxMutationsToPrint,
+                                        CurrentDictionaryEntrySequence.size());
+    for (size_t i = 0; i < EntriesToPrint; i++) {
 
       Printf("\"");
-      PrintASCII(DE->GetW(), "\"-");
+      PrintASCII(CurrentDictionaryEntrySequence[i]->GetW(), "\"-");
 
     }
 
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.h b/custom_mutators/libfuzzer/FuzzerMutate.h
index 3ce3159f..37fd6100 100644
--- a/custom_mutators/libfuzzer/FuzzerMutate.h
+++ b/custom_mutators/libfuzzer/FuzzerMutate.h
@@ -24,8 +24,9 @@ public:
   ~MutationDispatcher() {}
   /// Indicate that we are about to start a new sequence of mutations.
   void StartMutationSequence();
-  /// Print the current sequence of mutations.
-  void PrintMutationSequence();
+  /// Print the current sequence of mutations. Only prints the full sequence
+  /// when Verbose is true.
+  void PrintMutationSequence(bool Verbose = true);
   /// Return the current sequence of mutations.
   std::string MutationSequence();
   /// Indicate that the current sequence of mutations was successful.
diff --git a/custom_mutators/libfuzzer/FuzzerOptions.h b/custom_mutators/libfuzzer/FuzzerOptions.h
index 706e1c64..20b810b2 100644
--- a/custom_mutators/libfuzzer/FuzzerOptions.h
+++ b/custom_mutators/libfuzzer/FuzzerOptions.h
@@ -46,7 +46,7 @@ struct FuzzingOptions {
   size_t MaxNumberOfRuns = -1L;
   int ReportSlowUnits = 10;
   bool OnlyASCII = false;
-  bool Entropic = false;
+  bool Entropic = true;
   size_t EntropicFeatureFrequencyThreshold = 0xFF;
   size_t EntropicNumberOfRarestFeatures = 100;
   bool EntropicScalePerExecTime = false;
diff --git a/custom_mutators/libfuzzer/Makefile b/custom_mutators/libfuzzer/Makefile
index 34a358ac..95402f6c 100644
--- a/custom_mutators/libfuzzer/Makefile
+++ b/custom_mutators/libfuzzer/Makefile
@@ -1,81 +1,81 @@
 
-#CFLAGS = -O3 -funroll-loops -fPIC -fpermissive -std=c++11
-CFLAGS = -g -O0 -fPIC -fpermissive -std=c++11
-CC ?= clang++
+CFLAGS = -g -O3 -funroll-loops -fPIC -fpermissive -std=c++11
+#CFLAGS = -g -O0 -fPIC -fpermissive -std=c++11
+CXX ?= clang++
 
 all: libfuzzer-mutator.so
 
 FuzzerCrossOver.o:	FuzzerCrossOver.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerDataFlowTrace.o:	FuzzerDataFlowTrace.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerDriver.o:	FuzzerDriver.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerExtFunctionsDlsym.o:	FuzzerExtFunctionsDlsym.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerExtFunctionsWeak.o:	FuzzerExtFunctionsWeak.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerExtFunctionsWindows.o:	FuzzerExtFunctionsWindows.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerExtraCounters.o:	FuzzerExtraCounters.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerFork.o:	FuzzerFork.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerIO.o:	FuzzerIO.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerIOPosix.o:	FuzzerIOPosix.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerIOWindows.o:	FuzzerIOWindows.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerLoop.o:	FuzzerLoop.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerMerge.o:	FuzzerMerge.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerMutate.o:	FuzzerMutate.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerSHA1.o:	FuzzerSHA1.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerTracePC.o:	FuzzerTracePC.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtil.o:	FuzzerUtil.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtilDarwin.o:	FuzzerUtilDarwin.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtilFuchsia.o:	FuzzerUtilFuchsia.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtilLinux.o:	FuzzerUtilLinux.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtilPosix.o:	FuzzerUtilPosix.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 FuzzerUtilWindows.o:	FuzzerUtilWindows.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 libfuzzer.o:	libfuzzer.cpp
-	$(CC) $(CFLAGS) -I../../include -I. -c $^
+	$(CXX) $(CFLAGS) -I../../include -I. -c $^
 
 libfuzzer-mutator.so:	FuzzerCrossOver.o FuzzerDataFlowTrace.o FuzzerDriver.o FuzzerExtFunctionsDlsym.o FuzzerExtFunctionsWeak.o FuzzerExtFunctionsWindows.o FuzzerExtraCounters.o FuzzerFork.o FuzzerIO.o FuzzerIOPosix.o FuzzerIOWindows.o FuzzerLoop.o FuzzerMerge.o FuzzerMutate.o FuzzerSHA1.o FuzzerTracePC.o FuzzerUtil.o FuzzerUtilDarwin.o FuzzerUtilFuchsia.o FuzzerUtilLinux.o FuzzerUtilPosix.o FuzzerUtilWindows.o libfuzzer.o
-	$(CC) $(CFLAGS) -I../../include -I. -shared -o libfuzzer-mutator.so *.o
+	$(CXX) $(CFLAGS) -I../../include -I. -shared -o libfuzzer-mutator.so *.o
 
 clean:
 	rm -f *.o *~ *.so core
diff --git a/custom_mutators/libfuzzer/README.md b/custom_mutators/libfuzzer/README.md
index a773da02..4783f2ca 100644
--- a/custom_mutators/libfuzzer/README.md
+++ b/custom_mutators/libfuzzer/README.md
@@ -21,4 +21,4 @@ are done.
 
 > Original repository: https://github.com/llvm/llvm-project
 > Path: compiler-rt/lib/fuzzer/*.{h|cpp}
-> Source commit: d4b88ac1658d681e143482336cac27c6a74b8b24
+> Source commit: df3e903655e2499968fc7af64fb5fa52b2ee79bb
diff --git a/custom_mutators/libfuzzer/libfuzzer.cpp b/custom_mutators/libfuzzer/libfuzzer.cpp
index cf41af2d..5e37df66 100644
--- a/custom_mutators/libfuzzer/libfuzzer.cpp
+++ b/custom_mutators/libfuzzer/libfuzzer.cpp
@@ -72,7 +72,7 @@ extern "C" my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
 
 /* When a new queue entry is added we check if there are new dictionary
    entries to add to honggfuzz structure */
-#if ß
+#if 0
 extern "C" void afl_custom_queue_new_entry(my_mutator_t * data,
                                            const uint8_t *filename_new_queue,
                                            const uint8_t *filename_orig_queue) {
-- 
cgit 1.4.1


From 46a828212ed14b7d4c76e08ed5745dd155fd151e Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 29 Oct 2020 23:43:58 +0100
Subject: typo

---
 custom_mutators/libfuzzer/FuzzerBuiltins.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerBuiltins.h b/custom_mutators/libfuzzer/FuzzerBuiltins.h
index 4c0ada82..7330c9d3 100644
--- a/custom_mutators/libfuzzer/FuzzerBuiltins.h
+++ b/custom_mutators/libfuzzer/FuzzerBuiltins.h
@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// Wrapper functions and marcos around builtin functions.
+// Wrapper functions and macros around builtin functions.
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_FUZZER_BUILTINS_H
-- 
cgit 1.4.1


From 3e17a90faa067393b0695711dafb6b8716935829 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 29 Oct 2020 23:45:22 +0100
Subject: typo

---
 custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h b/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
index c5bec978..6754577c 100644
--- a/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
+++ b/custom_mutators/libfuzzer/FuzzerBuiltinsMsvc.h
@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// Wrapper functions and marcos that use intrinsics instead of builtin functions
+// Wrapper functions and macros that use intrinsics instead of builtin functions
 // which cannot be compiled by MSVC.
 //===----------------------------------------------------------------------===//
 
-- 
cgit 1.4.1


From 2decf1d088cbe41a47adf465e487364cad73be59 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 29 Oct 2020 23:55:00 +0100
Subject: typo

---
 custom_mutators/libfuzzer/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/README.md b/custom_mutators/libfuzzer/README.md
index 4783f2ca..fb3025f2 100644
--- a/custom_mutators/libfuzzer/README.md
+++ b/custom_mutators/libfuzzer/README.md
@@ -6,7 +6,7 @@ just type `make` to build
 
 ```AFL_CUSTOM_MUTATOR_LIBRARY=custom_mutators/libfuzzer/libfuzzer-mutator.so afl-fuzz ...```
 
-Note that is is currently simple and is missing two features:
+Note that this is currently a simple implementation and it is missing two features:
   * Splicing ("Crossover")
   * Dictionary support
 
-- 
cgit 1.4.1


From 158efe49ac38460617884d593cf7b924d33de6a7 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 29 Oct 2020 23:57:51 +0100
Subject: typo

---
 custom_mutators/symcc/symcc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 6f14052f..18b475b8 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -172,7 +172,7 @@ uint32_t afl_custom_fuzz_count(my_mutator_t *data, const u8 *buf,
 
 }
 
-/* here we actualy just read the files generated from symcc */
+/* here we actually just read the files generated from symcc */
 size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
                        u8 **out_buf, uint8_t *add_buf, size_t add_buf_size,
                        size_t max_size) {
-- 
cgit 1.4.1


From 166130324898071a08e178dfeb901af44168236e Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 10 Nov 2020 13:43:48 +0100
Subject: fix libfuzzer custom mutator and add introspection function

---
 custom_mutators/libfuzzer/FuzzerIO.cpp     |  7 +++++++
 custom_mutators/libfuzzer/FuzzerLoop.cpp   | 13 ++++++++++++-
 custom_mutators/libfuzzer/FuzzerMutate.cpp | 24 ++++++++++++++++++++++--
 custom_mutators/libfuzzer/FuzzerMutate.h   |  1 +
 custom_mutators/libfuzzer/Makefile         |  5 +++++
 custom_mutators/libfuzzer/libfuzzer.cpp    | 12 ++++++++++++
 6 files changed, 59 insertions(+), 3 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/libfuzzer/FuzzerIO.cpp b/custom_mutators/libfuzzer/FuzzerIO.cpp
index e0c15db4..d8d52b63 100644
--- a/custom_mutators/libfuzzer/FuzzerIO.cpp
+++ b/custom_mutators/libfuzzer/FuzzerIO.cpp
@@ -83,6 +83,8 @@ void WriteToFile(const std::string &Data, const std::string &Path) {
 
 void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
 
+  return;
+ 
   // Use raw C interface because this function may be called from a sig handler.
   FILE *Out = fopen(Path.c_str(), "wb");
   if (!Out) return;
@@ -93,6 +95,8 @@ void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
 
 void AppendToFile(const std::string &Data, const std::string &Path) {
 
+  return;
+
   AppendToFile(reinterpret_cast<const uint8_t *>(Data.data()), Data.size(),
                Path);
 
@@ -100,6 +104,8 @@ void AppendToFile(const std::string &Data, const std::string &Path) {
 
 void AppendToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
 
+  return;
+
   FILE *Out = fopen(Path.c_str(), "a");
   if (!Out) return;
   fwrite(Data, sizeof(Data[0]), Size, Out);
@@ -182,6 +188,7 @@ void Printf(const char *Fmt, ...) {
 
 void VPrintf(bool Verbose, const char *Fmt, ...) {
 
+  return;
   if (!Verbose) return;
   va_list ap;
   va_start(ap, Fmt);
diff --git a/custom_mutators/libfuzzer/FuzzerLoop.cpp b/custom_mutators/libfuzzer/FuzzerLoop.cpp
index 201883f0..08fda520 100644
--- a/custom_mutators/libfuzzer/FuzzerLoop.cpp
+++ b/custom_mutators/libfuzzer/FuzzerLoop.cpp
@@ -206,6 +206,8 @@ void Fuzzer::StaticDeathCallback() {
 
 void Fuzzer::DumpCurrentUnit(const char *Prefix) {
 
+  return;
+
   if (!CurrentUnitData) return;  // Happens when running individual inputs.
   ScopedDisableMsanInterceptorChecks S;
   MD.PrintMutationSequence();
@@ -733,6 +735,7 @@ std::string Fuzzer::WriteToOutputCorpus(const Unit &U) {
 
 void Fuzzer::WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix) {
 
+  return;
   if (!Options.SaveArtifacts) return;
   std::string Path = Options.ArtifactPrefix + Prefix + Hash(U);
   if (!Options.ExactArtifactPath.empty())
@@ -1073,13 +1076,21 @@ void Fuzzer::MinimizeCrashLoop(const Unit &U) {
 
 }  // namespace fuzzer
 
+#ifdef  INTROSPECTION
+  extern const char *introspection_ptr;
+#endif
+
 extern "C" {
 
 ATTRIBUTE_INTERFACE size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size,
                                             size_t MaxSize) {
 
   assert(fuzzer::F);
-  return fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
+  size_t r = fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
+#ifdef  INTROSPECTION
+  introspection_ptr = fuzzer::F->GetMD().WriteMutationSequence();
+#endif
+  return r;
 
 }
 
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.cpp b/custom_mutators/libfuzzer/FuzzerMutate.cpp
index eebae39b..edfe0455 100644
--- a/custom_mutators/libfuzzer/FuzzerMutate.cpp
+++ b/custom_mutators/libfuzzer/FuzzerMutate.cpp
@@ -14,6 +14,8 @@
 #include "FuzzerMutate.h"
 #include "FuzzerOptions.h"
 #include "FuzzerTracePC.h"
+#include <random>
+#include <chrono>
 
 namespace fuzzer {
 
@@ -100,15 +102,17 @@ size_t MutationDispatcher::Mutate_CustomCrossOver(uint8_t *Data, size_t Size,
 
 }
 
+
 size_t MutationDispatcher::Mutate_ShuffleBytes(uint8_t *Data, size_t Size,
                                                size_t MaxSize) {
-
   if (Size > MaxSize || Size == 0) return 0;
   size_t ShuffleAmount =
       Rand(std::min(Size, (size_t)8)) + 1;  // [1,8] and <= Size.
   size_t ShuffleStart = Rand(Size - ShuffleAmount);
   assert(ShuffleStart + ShuffleAmount <= Size);
-  std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, Rand);
+  unsigned num = std::chrono::system_clock::now().time_since_epoch().count();
+  std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, std::default_random_engine(num));
+  //std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, Rand);
   return Size;
 
 }
@@ -609,8 +613,24 @@ void MutationDispatcher::PrintRecommendedDictionary() {
 
 }
 
+const char *MutationDispatcher::WriteMutationSequence() {
+
+  static std::string buf;
+  buf = "";
+
+  for (size_t i = 0; i < CurrentMutatorSequence.size(); i++) {
+  
+    buf = buf + " " + CurrentMutatorSequence[i].Name;
+  
+  }
+  
+  return buf.c_str();
+
+}
+
 void MutationDispatcher::PrintMutationSequence(bool Verbose) {
 
+  return;
   Printf("MS: %zd ", CurrentMutatorSequence.size());
   size_t EntriesToPrint =
       Verbose ? CurrentMutatorSequence.size()
diff --git a/custom_mutators/libfuzzer/FuzzerMutate.h b/custom_mutators/libfuzzer/FuzzerMutate.h
index 37fd6100..6252f265 100644
--- a/custom_mutators/libfuzzer/FuzzerMutate.h
+++ b/custom_mutators/libfuzzer/FuzzerMutate.h
@@ -26,6 +26,7 @@ public:
   void StartMutationSequence();
   /// Print the current sequence of mutations. Only prints the full sequence
   /// when Verbose is true.
+  const char *WriteMutationSequence();
   void PrintMutationSequence(bool Verbose = true);
   /// Return the current sequence of mutations.
   std::string MutationSequence();
diff --git a/custom_mutators/libfuzzer/Makefile b/custom_mutators/libfuzzer/Makefile
index 95402f6c..51263b89 100644
--- a/custom_mutators/libfuzzer/Makefile
+++ b/custom_mutators/libfuzzer/Makefile
@@ -3,6 +3,11 @@ CFLAGS = -g -O3 -funroll-loops -fPIC -fpermissive -std=c++11
 #CFLAGS = -g -O0 -fPIC -fpermissive -std=c++11
 CXX ?= clang++
 
+ifdef INTROSPECTION
+  $(info Compiling with introspection documentation)
+  CFLAGS += -DINTROSPECTION=1
+endif
+
 all: libfuzzer-mutator.so
 
 FuzzerCrossOver.o:	FuzzerCrossOver.cpp
diff --git a/custom_mutators/libfuzzer/libfuzzer.cpp b/custom_mutators/libfuzzer/libfuzzer.cpp
index 5e37df66..a4f94328 100644
--- a/custom_mutators/libfuzzer/libfuzzer.cpp
+++ b/custom_mutators/libfuzzer/libfuzzer.cpp
@@ -6,6 +6,10 @@
 //#include "debug.h"
 #include "afl-fuzz.h"
 
+#ifdef  INTROSPECTION
+  const char *introspection_ptr;
+#endif
+
 afl_state_t *afl_struct;
 
 extern "C" size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
@@ -133,6 +137,14 @@ extern "C" size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf,
 
 }
 
+#ifdef  INTROSPECTION
+extern "C" const char* afl_custom_introspection(my_mutator_t *data) {
+
+  return introspection_ptr;
+
+}
+#endif
+
 /**
  * Deinitialize everything
  *
-- 
cgit 1.4.1


From 20a8a93fd193f7526f5e3d0cd1dfa43df9d2c4f6 Mon Sep 17 00:00:00 2001
From: Rumata888 <isennovskiy@gmail.com>
Date: Thu, 12 Nov 2020 01:13:57 +0300
Subject: Fixed symcc custom mutator

---
 custom_mutators/symcc/symcc.c                    | 67 +++++++++++++++++-------
 custom_mutators/symcc/test_examples/file_test.c  | 27 ++++++++++
 custom_mutators/symcc/test_examples/stdin_test.c | 22 ++++++++
 src/afl-fuzz-bitmap.c                            | 10 ++--
 4 files changed, 101 insertions(+), 25 deletions(-)
 create mode 100644 custom_mutators/symcc/test_examples/file_test.c
 create mode 100644 custom_mutators/symcc/test_examples/stdin_test.c

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 18b475b8..ab3d70ca 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -1,7 +1,10 @@
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
 #include "config.h"
 #include "debug.h"
 #include "afl-fuzz.h"
@@ -95,40 +98,66 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
                                 const uint8_t *filename_new_queue,
                                 const uint8_t *filename_orig_queue) {
 
+  int pipefd[2];
+  struct stat st;
+  ACTF("Queueing to symcc: %s", filename_new_queue);
+  u8 *fn = alloc_printf("%s", filename_new_queue);
+  if (!(stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size)) {
+    PFATAL("Couldn't find enqueued file: %s",fn);
+  }
+   
+  if (afl_struct->fsrv.use_stdin){
+    if (pipe(pipefd)==-1)
+    {
+      exit(-1); 
+    }
+  }
   int pid = fork();
 
   if (pid == -1) return;
+  
+  if (pid){
 
-  if (pid) pid = waitpid(pid, NULL, 0);
-
-  if (pid == 0) {
+    if (afl_struct->fsrv.use_stdin){
 
-    setenv("SYMCC_INPUT_FILE", afl_struct->fsrv.out_file, 1);
-
-    if (afl_struct->fsrv.use_stdin) {
-
-      u8 *fn = alloc_printf("%s/%s", afl_struct->out_dir, filename_new_queue);
+      close(pipefd[0]);
       int fd = open(fn, O_RDONLY);
-
+    
       if (fd >= 0) {
-
+  
         ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
-        close(fd);
         DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
         if (r <= 0) return;
-        close(0);
-        ck_write(0, data->mutator_buf, r, fn);
-        ck_free(fn);
-
+        close(fd);
+        if (r>fcntl(pipefd[1],F_GETPIPE_SZ)) fcntl(pipefd[1],F_SETPIPE_SZ,MAX_FILE);
+        ck_write(pipefd[1], data->mutator_buf, r, filename_new_queue);
+      } else {
+        PFATAL("Something happened to the enqueued file before sending its contents to symcc binary");
       }
 
+      close(pipefd[1]);
+      ck_free(fn);
     }
+    pid = waitpid(pid,NULL, 0);
+  }
 
+  if (pid == 0) {
+     if (afl_struct->fsrv.use_stdin) {
+        unsetenv("SYMCC_INPUT_FILE");
+        close(pipefd[1]);
+        dup2(pipefd[0],0);
+      }
+      else
+      {
+      setenv("SYMCC_INPUT_FILE", afl_struct->fsrv.out_file, 1);
+      }
+    
     DBG("exec=%s\n", data->target);
     close(1);
     close(2);
     dup2(afl_struct->fsrv.dev_null_fd, 1);
     dup2(afl_struct->fsrv.dev_null_fd, 2);
+
     execvp(data->target, afl_struct->argv);
     DBG("exec=FAIL\n");
     exit(-1);
@@ -179,8 +208,8 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
 
   struct dirent **nl;
   int32_t         i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
-  size_t          size = 0;
-
+  ssize_t          size = 0;
+  
   if (items <= 0) return 0;
 
   for (i = 0; i < (u32)items; ++i) {
@@ -195,9 +224,9 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
         int fd = open(fn, O_RDONLY);
 
         if (fd >= 0) {
-
           size = read(fd, data->mutator_buf, max_size);
           *out_buf = data->mutator_buf;
+
           close(fd);
           done = 1;
 
@@ -216,7 +245,7 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
 
   free(nl);
   DBG("FUZZ size=%lu\n", size);
-  return size;
+  return (uint32_t)size;
 
 }
 
diff --git a/custom_mutators/symcc/test_examples/file_test.c b/custom_mutators/symcc/test_examples/file_test.c
new file mode 100644
index 00000000..25271788
--- /dev/null
+++ b/custom_mutators/symcc/test_examples/file_test.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int main(int argc, char** argv){
+  if (argc<2){
+    printf("Need a file argument\n");
+    return 1;
+  }
+  int fd=open(argv[1],O_RDONLY);
+  if (fd<0){
+    printf("Couldn't open file\n");
+    return 1;
+  }
+  uint32_t value = 0;
+  
+  read(fd,&value,sizeof(value));
+  close(fd);
+
+  value=value^0xffffffff;
+  if (value== 0x11223344) printf("Value one\n");
+  if (value == 0x44332211) printf("Value two\n");
+  if (value != 0x0) printf("Not zero\n");
+  return 0; 
+}
diff --git a/custom_mutators/symcc/test_examples/stdin_test.c b/custom_mutators/symcc/test_examples/stdin_test.c
new file mode 100644
index 00000000..be87419b
--- /dev/null
+++ b/custom_mutators/symcc/test_examples/stdin_test.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+   char input_buffer[16];
+   uint32_t comparisonValue;
+   size_t bytesRead;
+   bytesRead=read(STDIN_FILENO,input_buffer, sizeof(input_buffer));
+   if (bytesRead < 0) exit(-1);
+   comparisonValue=*(uint32_t*)input_buffer;
+   comparisonValue=comparisonValue^0xff112233;
+   if (comparisonValue==0x66554493){
+    printf("First value\n");
+   }
+   else{
+     if (comparisonValue==0x84444415) printf("Second value\n");
+   }
+   return 0;
+}
diff --git a/src/afl-fuzz-bitmap.c b/src/afl-fuzz-bitmap.c
index 735420c3..4b29672a 100644
--- a/src/afl-fuzz-bitmap.c
+++ b/src/afl-fuzz-bitmap.c
@@ -584,7 +584,10 @@ save_if_interesting(afl_state_t *afl, void *mem, u32 len, u8 fault) {
         alloc_printf("%s/queue/id_%06u", afl->out_dir, afl->queued_paths);
 
 #endif                                                    /* ^!SIMPLE_FILES */
-
+    fd = open(queue_fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
+    if (unlikely(fd < 0)) { PFATAL("Unable to create '%s'", queue_fn); }
+    ck_write(fd, mem, len, queue_fn);
+    close(fd);
     add_to_queue(afl, queue_fn, len, 0);
 
 #ifdef INTROSPECTION
@@ -623,11 +626,6 @@ save_if_interesting(afl_state_t *afl, void *mem, u32 len, u8 fault) {
 
     }
 
-    fd = open(queue_fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
-    if (unlikely(fd < 0)) { PFATAL("Unable to create '%s'", queue_fn); }
-    ck_write(fd, mem, len, queue_fn);
-    close(fd);
-
     if (likely(afl->q_testcase_max_cache_size)) {
 
       queue_testcase_store_mem(afl, afl->queue_top, mem);
-- 
cgit 1.4.1


From bb218b330f43fada18b910a7bf2b00c6d1a32b23 Mon Sep 17 00:00:00 2001
From: Rumata888 <isennovskiy@gmail.com>
Date: Thu, 12 Nov 2020 01:29:17 +0300
Subject: Formatted changed/added files

---
 custom_mutators/symcc/symcc.c                    | 69 ++++++++++++++----------
 custom_mutators/symcc/test_examples/file_test.c  | 27 ++++++----
 custom_mutators/symcc/test_examples/stdin_test.c | 36 +++++++------
 3 files changed, 81 insertions(+), 51 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index ab3d70ca..abb58d5e 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -98,60 +98,74 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
                                 const uint8_t *filename_new_queue,
                                 const uint8_t *filename_orig_queue) {
 
-  int pipefd[2];
+  int         pipefd[2];
   struct stat st;
   ACTF("Queueing to symcc: %s", filename_new_queue);
   u8 *fn = alloc_printf("%s", filename_new_queue);
   if (!(stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size)) {
-    PFATAL("Couldn't find enqueued file: %s",fn);
+
+    PFATAL("Couldn't find enqueued file: %s", fn);
+
   }
-   
-  if (afl_struct->fsrv.use_stdin){
-    if (pipe(pipefd)==-1)
-    {
-      exit(-1); 
-    }
+
+  if (afl_struct->fsrv.use_stdin) {
+
+    if (pipe(pipefd) == -1) { exit(-1); }
+
   }
+
   int pid = fork();
 
   if (pid == -1) return;
-  
-  if (pid){
 
-    if (afl_struct->fsrv.use_stdin){
+  if (pid) {
+
+    if (afl_struct->fsrv.use_stdin) {
 
       close(pipefd[0]);
       int fd = open(fn, O_RDONLY);
-    
+
       if (fd >= 0) {
-  
+
         ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
         DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
         if (r <= 0) return;
         close(fd);
-        if (r>fcntl(pipefd[1],F_GETPIPE_SZ)) fcntl(pipefd[1],F_SETPIPE_SZ,MAX_FILE);
+        if (r > fcntl(pipefd[1], F_GETPIPE_SZ))
+          fcntl(pipefd[1], F_SETPIPE_SZ, MAX_FILE);
         ck_write(pipefd[1], data->mutator_buf, r, filename_new_queue);
+
       } else {
-        PFATAL("Something happened to the enqueued file before sending its contents to symcc binary");
+
+        PFATAL(
+            "Something happened to the enqueued file before sending its "
+            "contents to symcc binary");
+
       }
 
       close(pipefd[1]);
       ck_free(fn);
+
     }
-    pid = waitpid(pid,NULL, 0);
+
+    pid = waitpid(pid, NULL, 0);
+
   }
 
   if (pid == 0) {
-     if (afl_struct->fsrv.use_stdin) {
-        unsetenv("SYMCC_INPUT_FILE");
-        close(pipefd[1]);
-        dup2(pipefd[0],0);
-      }
-      else
-      {
+
+    if (afl_struct->fsrv.use_stdin) {
+
+      unsetenv("SYMCC_INPUT_FILE");
+      close(pipefd[1]);
+      dup2(pipefd[0], 0);
+
+    } else {
+
       setenv("SYMCC_INPUT_FILE", afl_struct->fsrv.out_file, 1);
-      }
-    
+
+    }
+
     DBG("exec=%s\n", data->target);
     close(1);
     close(2);
@@ -208,8 +222,8 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
 
   struct dirent **nl;
   int32_t         i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
-  ssize_t          size = 0;
-  
+  ssize_t         size = 0;
+
   if (items <= 0) return 0;
 
   for (i = 0; i < (u32)items; ++i) {
@@ -224,6 +238,7 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
         int fd = open(fn, O_RDONLY);
 
         if (fd >= 0) {
+
           size = read(fd, data->mutator_buf, max_size);
           *out_buf = data->mutator_buf;
 
diff --git a/custom_mutators/symcc/test_examples/file_test.c b/custom_mutators/symcc/test_examples/file_test.c
index 25271788..f2b92986 100644
--- a/custom_mutators/symcc/test_examples/file_test.c
+++ b/custom_mutators/symcc/test_examples/file_test.c
@@ -4,24 +4,33 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-int main(int argc, char** argv){
-  if (argc<2){
+int main(int argc, char **argv) {
+
+  if (argc < 2) {
+
     printf("Need a file argument\n");
     return 1;
+
   }
-  int fd=open(argv[1],O_RDONLY);
-  if (fd<0){
+
+  int fd = open(argv[1], O_RDONLY);
+  if (fd < 0) {
+
     printf("Couldn't open file\n");
     return 1;
+
   }
+
   uint32_t value = 0;
-  
-  read(fd,&value,sizeof(value));
+
+  read(fd, &value, sizeof(value));
   close(fd);
 
-  value=value^0xffffffff;
-  if (value== 0x11223344) printf("Value one\n");
+  value = value ^ 0xffffffff;
+  if (value == 0x11223344) printf("Value one\n");
   if (value == 0x44332211) printf("Value two\n");
   if (value != 0x0) printf("Not zero\n");
-  return 0; 
+  return 0;
+
 }
+
diff --git a/custom_mutators/symcc/test_examples/stdin_test.c b/custom_mutators/symcc/test_examples/stdin_test.c
index be87419b..3acfc523 100644
--- a/custom_mutators/symcc/test_examples/stdin_test.c
+++ b/custom_mutators/symcc/test_examples/stdin_test.c
@@ -3,20 +3,26 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-int main(int argc, char** argv)
-{
-   char input_buffer[16];
-   uint32_t comparisonValue;
-   size_t bytesRead;
-   bytesRead=read(STDIN_FILENO,input_buffer, sizeof(input_buffer));
-   if (bytesRead < 0) exit(-1);
-   comparisonValue=*(uint32_t*)input_buffer;
-   comparisonValue=comparisonValue^0xff112233;
-   if (comparisonValue==0x66554493){
+int main(int argc, char **argv) {
+
+  char     input_buffer[16];
+  uint32_t comparisonValue;
+  size_t   bytesRead;
+  bytesRead = read(STDIN_FILENO, input_buffer, sizeof(input_buffer));
+  if (bytesRead < 0) exit(-1);
+  comparisonValue = *(uint32_t *)input_buffer;
+  comparisonValue = comparisonValue ^ 0xff112233;
+  if (comparisonValue == 0x66554493) {
+
     printf("First value\n");
-   }
-   else{
-     if (comparisonValue==0x84444415) printf("Second value\n");
-   }
-   return 0;
+
+  } else {
+
+    if (comparisonValue == 0x84444415) printf("Second value\n");
+
+  }
+
+  return 0;
+
 }
+
-- 
cgit 1.4.1


From c05c5b787b77e537eae256905c13809f56d213d4 Mon Sep 17 00:00:00 2001
From: Rumata888 <isennovskiy@gmail.com>
Date: Thu, 12 Nov 2020 02:36:08 +0300
Subject: Fixed name collision problem

---
 custom_mutators/symcc/symcc.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index abb58d5e..531a462b 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -24,6 +24,7 @@ typedef struct my_mutator {
   afl_state_t *afl;
   u8 *         mutator_buf;
   u8 *         out_dir;
+  u8 *         tmp_dir;
   u8 *         target;
   uint32_t     seed;
 
@@ -57,10 +58,11 @@ my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
   if (!(data->out_dir = getenv("SYMCC_OUTPUT_DIR"))) {
 
     data->out_dir = alloc_printf("%s/symcc", afl->out_dir);
-    setenv("SYMCC_OUTPUT_DIR", data->out_dir, 1);
 
   }
 
+  data->tmp_dir = alloc_printf("%s/tmp", data->out_dir);
+  setenv("SYMCC_OUTPUT_DIR", data->tmp_dir, 1);
   int pid = fork();
 
   if (pid == -1) return NULL;
@@ -86,6 +88,10 @@ my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
 
   if (mkdir(data->out_dir, 0755))
     PFATAL("Could not create directory %s", data->out_dir);
+
+  if (mkdir(data->tmp_dir, 0755))
+    PFATAL("Could not create directory %s", data->tmp_dir);
+
   DBG("out_dir=%s, target=%s\n", data->out_dir, data->target);
 
   return data;
@@ -150,6 +156,39 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
 
     pid = waitpid(pid, NULL, 0);
 
+    // At this point we need to transfer files to output dir, since their names
+    // collide and symcc will just overwrite them
+
+    struct dirent **nl;
+    int32_t         items = scandir(data->tmp_dir, &nl, NULL, NULL);
+    u8 *            origin_name = basename(filename_new_queue);
+    int32_t         i;
+    if (items > 0) {
+
+      for (i = 0; i < (u32)items; ++i) {
+
+        struct stat st;
+        u8 *source_name = alloc_printf("%s/%s", data->tmp_dir, nl[i]->d_name);
+        u8 *destination_name =
+            alloc_printf("%s/%s.%s", data->out_dir, origin_name, nl[i]->d_name);
+        DBG("test=%s\n", fn);
+        if (stat(source_name, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
+
+          rename(source_name, destination_name);
+          DBG("found=%s\n", source_name);
+
+        }
+
+        ck_free(source_name);
+        ck_free(destination_name);
+        free(nl[i]);
+
+      }
+
+      free(nl);
+
+    }
+
   }
 
   if (pid == 0) {
-- 
cgit 1.4.1


From ffe41e6fcec3e6228770c8fe11ec67b8cfb4878c Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 12 Nov 2020 20:26:53 +0100
Subject: fix two mem leaks detected by cppcheck

---
 custom_mutators/honggfuzz/honggfuzz.c   | 1 +
 custom_mutators/libfuzzer/libfuzzer.cpp | 1 +
 unicorn_mode/unicornafl                 | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/honggfuzz.c b/custom_mutators/honggfuzz/honggfuzz.c
index bde922c6..b4f07258 100644
--- a/custom_mutators/honggfuzz/honggfuzz.c
+++ b/custom_mutators/honggfuzz/honggfuzz.c
@@ -37,6 +37,7 @@ my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
 
   if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
 
+    free(data);
     perror("mutator_buf alloc");
     return NULL;
 
diff --git a/custom_mutators/libfuzzer/libfuzzer.cpp b/custom_mutators/libfuzzer/libfuzzer.cpp
index a4f94328..dc1fbeb2 100644
--- a/custom_mutators/libfuzzer/libfuzzer.cpp
+++ b/custom_mutators/libfuzzer/libfuzzer.cpp
@@ -50,6 +50,7 @@ extern "C" my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
 
   if ((data->mutator_buf = (u8 *)malloc(MAX_FILE)) == NULL) {
 
+    free(data);
     perror("mutator_buf alloc");
     return NULL;
 
diff --git a/unicorn_mode/unicornafl b/unicorn_mode/unicornafl
index 0bf26f6c..c6d66471 160000
--- a/unicorn_mode/unicornafl
+++ b/unicorn_mode/unicornafl
@@ -1 +1 @@
-Subproject commit 0bf26f6c2601e1c1c84998551ed7d50b4108fbdf
+Subproject commit c6d6647161a32bae88785a618fcd828d1711d9e6
-- 
cgit 1.4.1


From 35fd6847fe99c2f7bbec247c71b44babcdcab2b8 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Thu, 12 Nov 2020 21:51:44 +0100
Subject: another two mem leaks

---
 custom_mutators/radamsa/radamsa-mutator.c | 1 +
 custom_mutators/symcc/symcc.c             | 1 +
 2 files changed, 2 insertions(+)

(limited to 'custom_mutators')

diff --git a/custom_mutators/radamsa/radamsa-mutator.c b/custom_mutators/radamsa/radamsa-mutator.c
index 82d28001..624ace3d 100644
--- a/custom_mutators/radamsa/radamsa-mutator.c
+++ b/custom_mutators/radamsa/radamsa-mutator.c
@@ -33,6 +33,7 @@ my_mutator_t *afl_custom_init(afl_t *afl, unsigned int seed) {
 
   if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
 
+    free(data);
     perror("mutator_buf alloc");
     return NULL;
 
diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 18b475b8..f32f98f8 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -41,6 +41,7 @@ my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
 
   if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
 
+    free(data);
     perror("mutator_buf alloc");
     return NULL;
 
-- 
cgit 1.4.1


From 622f942555772c9d15569ecdd77a67d1a2f6bd78 Mon Sep 17 00:00:00 2001
From: Rumata888 <isennovskiy@gmail.com>
Date: Fri, 13 Nov 2020 14:54:36 +0300
Subject: Fixed memleaks, change exit to PFATAL

---
 custom_mutators/symcc/symcc.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 531a462b..54a7fbb0 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -110,13 +110,19 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
   u8 *fn = alloc_printf("%s", filename_new_queue);
   if (!(stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size)) {
 
+    ck_free(fn);
     PFATAL("Couldn't find enqueued file: %s", fn);
 
   }
 
   if (afl_struct->fsrv.use_stdin) {
 
-    if (pipe(pipefd) == -1) { exit(-1); }
+    if (pipe(pipefd) == -1) {
+
+      ck_free(fn);
+      PFATAL("Couldn't create a pipe for interacting with symcc child process");
+
+    }
 
   }
 
@@ -135,6 +141,7 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
 
         ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
         DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
+        ck_free(fn);
         if (r <= 0) return;
         close(fd);
         if (r > fcntl(pipefd[1], F_GETPIPE_SZ))
@@ -143,6 +150,8 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
 
       } else {
 
+        ck_free(fn);
+
         PFATAL(
             "Something happened to the enqueued file before sending its "
             "contents to symcc binary");
@@ -150,7 +159,6 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
       }
 
       close(pipefd[1]);
-      ck_free(fn);
 
     }
 
-- 
cgit 1.4.1


From 9d22c8a02ca9043e62c250a32d5affdaeab11dcd Mon Sep 17 00:00:00 2001
From: Rumata888 <isennovskiy@gmail.com>
Date: Tue, 17 Nov 2020 12:00:06 +0300
Subject: Fixed fd leak on early exit and closed pipes before early exits and
 PFATAL

---
 custom_mutators/symcc/symcc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 54a7fbb0..acec29da 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -142,8 +142,14 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
         ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
         DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
         ck_free(fn);
-        if (r <= 0) return;
         close(fd);
+        if (r <= 0) {
+
+          close(pipefd[1]);
+          return;
+
+        }
+
         if (r > fcntl(pipefd[1], F_GETPIPE_SZ))
           fcntl(pipefd[1], F_SETPIPE_SZ, MAX_FILE);
         ck_write(pipefd[1], data->mutator_buf, r, filename_new_queue);
@@ -151,7 +157,7 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
       } else {
 
         ck_free(fn);
-
+        close(pipefd[1]);
         PFATAL(
             "Something happened to the enqueued file before sending its "
             "contents to symcc binary");
-- 
cgit 1.4.1


From d042a63ab43545a5038fe46d11fef1bde8327028 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Tue, 17 Nov 2020 20:09:52 +0100
Subject: micro optimization: allocate only when needed

---
 custom_mutators/symcc/symcc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/symcc/symcc.c b/custom_mutators/symcc/symcc.c
index 9c6c0cb8..a609dafb 100644
--- a/custom_mutators/symcc/symcc.c
+++ b/custom_mutators/symcc/symcc.c
@@ -184,18 +184,18 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
 
         struct stat st;
         u8 *source_name = alloc_printf("%s/%s", data->tmp_dir, nl[i]->d_name);
-        u8 *destination_name =
-            alloc_printf("%s/%s.%s", data->out_dir, origin_name, nl[i]->d_name);
         DBG("test=%s\n", fn);
         if (stat(source_name, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
 
+          u8 *destination_name =
+              alloc_printf("%s/%s.%s", data->out_dir, origin_name, nl[i]->d_name);
           rename(source_name, destination_name);
+          ck_free(destination_name);
           DBG("found=%s\n", source_name);
 
         }
 
         ck_free(source_name);
-        ck_free(destination_name);
         free(nl[i]);
 
       }
-- 
cgit 1.4.1


From 5d6b1129f0e95a29a3fd7a7e09a93a5c1db6c78a Mon Sep 17 00:00:00 2001
From: "R. Elliott Childre" <elliottchildre329@gmail.com>
Date: Tue, 8 Dec 2020 03:30:17 -0500
Subject: Fix Grammar Mutator Submodule (#623)

Fixes: 651ad18e2179 ("added the grammar mutator as a git submodule ...")

* Project pointer never pushed
* Reduces dirctory complexity
* Building and dependencies for the subproject should be isolated to the
  subproject's documentation
* Fix broken link to README
* Use `--init` for `git submodule`
---
 .gitmodules                                             |  5 ++---
 custom_mutators/README.md                               | 10 ++++------
 custom_mutators/grammar_mutator                         |  1 +
 custom_mutators/grammar_mutator/README.md               |  6 ------
 .../grammar_mutator/build_grammar_mutator.sh            | 17 -----------------
 5 files changed, 7 insertions(+), 32 deletions(-)
 create mode 160000 custom_mutators/grammar_mutator
 delete mode 100644 custom_mutators/grammar_mutator/README.md
 delete mode 100755 custom_mutators/grammar_mutator/build_grammar_mutator.sh

(limited to 'custom_mutators')

diff --git a/.gitmodules b/.gitmodules
index 7c7613ac..78e9f439 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +1,8 @@
 [submodule "unicorn_mode/unicornafl"]
 	path = unicorn_mode/unicornafl
 	url = https://github.com/AFLplusplus/unicornafl
-
-[submodule "custom_mutators/Grammar-Mutator"]
-	path = custom_mutators/Grammar-Mutator
+[submodule "custom_mutators/grammar_mutator"]
+	path = custom_mutators/grammar_mutator
 	url = https://github.com/AFLplusplus/Grammar-Mutator
 [submodule "qemu_mode/qemuafl"]
 	path = qemu_mode/qemuafl
diff --git a/custom_mutators/README.md b/custom_mutators/README.md
index 0cf52746..b0444c85 100644
--- a/custom_mutators/README.md
+++ b/custom_mutators/README.md
@@ -7,15 +7,13 @@ For further information and documentation on how to write your own, read [the do
 
 If you use git to clone afl++, then the following will incorporate our
 excellent grammar custom mutator:
-```
-git submodule init
-git submodule update
+```sh
+git submodule update --init
 ```
 
-otherwise just use the script: `grammar_mutator/build_grammar_mutator.sh`
+Read the README in the [Grammar-Mutator] repository on how to use it.
 
-Read the [Grammar-Mutator/README.md](Grammar-Mutator/README.md) on how to use
-it.
+[Grammar-Mutator]: https://github.com/AFLplusplus/Grammar-Mutator
 
 ## Production-Ready Custom Mutators
 
diff --git a/custom_mutators/grammar_mutator b/custom_mutators/grammar_mutator
new file mode 160000
index 00000000..b3c4fcfa
--- /dev/null
+++ b/custom_mutators/grammar_mutator
@@ -0,0 +1 @@
+Subproject commit b3c4fcfa6ae28918bc410f7747135eafd4fb7263
diff --git a/custom_mutators/grammar_mutator/README.md b/custom_mutators/grammar_mutator/README.md
deleted file mode 100644
index a015744c..00000000
--- a/custom_mutators/grammar_mutator/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-# Grammar-Mutator
-
-This is just a stub directory that will clone the real grammar mutator
-directory.
-
-Execute `./build_grammar_mutator.sh` to set everything up.
diff --git a/custom_mutators/grammar_mutator/build_grammar_mutator.sh b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
deleted file mode 100755
index f3f5e164..00000000
--- a/custom_mutators/grammar_mutator/build_grammar_mutator.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/sh
-
-test -d Grammar-Mutator || git clone --depth=1 https://github.com/AFLplusplus/Grammar-Mutator
-
-cd Grammar-Mutator || exit 1
-git stash ; git pull
-
-wget -c https://www.antlr.org/download/antlr-4.8-complete.jar
-
-echo
-echo
-echo "All successfully prepared!"
-echo "To build for your grammar just do:"
-echo "  cd Grammar_Mutator"
-echo "  make GRAMMAR_FILE=/path/to/your/grammar"
-echo "You will find a JSON and RUBY grammar in Grammar_Mutator/grammars to play with."
-echo
-- 
cgit 1.4.1


From eda068751e1876797e1ec481ece356ecfb63f0cc Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Tue, 8 Dec 2020 10:09:35 +0100
Subject: streamlined grammar mutator submodule

---
 .gitmodules                                        |   2 +-
 custom_mutators/grammar_mutator                    |   1 -
 custom_mutators/grammar_mutator/GRAMMAR_VERSION    |   1 +
 custom_mutators/grammar_mutator/README.md          |   6 +
 .../grammar_mutator/build_grammar_mutator.sh       | 141 +++++++++++++++++++++
 custom_mutators/grammar_mutator/grammar_mutator    |   1 +
 .../grammar_mutator/update_grammar_ref.sh          |  50 ++++++++
 qemu_mode/build_qemu_support.sh                    |   2 +-
 unicorn_mode/build_unicorn_support.sh              |   2 +-
 9 files changed, 202 insertions(+), 4 deletions(-)
 delete mode 160000 custom_mutators/grammar_mutator
 create mode 100644 custom_mutators/grammar_mutator/GRAMMAR_VERSION
 create mode 100644 custom_mutators/grammar_mutator/README.md
 create mode 100644 custom_mutators/grammar_mutator/build_grammar_mutator.sh
 create mode 160000 custom_mutators/grammar_mutator/grammar_mutator
 create mode 100644 custom_mutators/grammar_mutator/update_grammar_ref.sh

(limited to 'custom_mutators')

diff --git a/.gitmodules b/.gitmodules
index 78e9f439..c787ec0e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,7 +2,7 @@
 	path = unicorn_mode/unicornafl
 	url = https://github.com/AFLplusplus/unicornafl
 [submodule "custom_mutators/grammar_mutator"]
-	path = custom_mutators/grammar_mutator
+	path = custom_mutators/grammar_mutator/grammar_mutator
 	url = https://github.com/AFLplusplus/Grammar-Mutator
 [submodule "qemu_mode/qemuafl"]
 	path = qemu_mode/qemuafl
diff --git a/custom_mutators/grammar_mutator b/custom_mutators/grammar_mutator
deleted file mode 160000
index b3c4fcfa..00000000
--- a/custom_mutators/grammar_mutator
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b3c4fcfa6ae28918bc410f7747135eafd4fb7263
diff --git a/custom_mutators/grammar_mutator/GRAMMAR_VERSION b/custom_mutators/grammar_mutator/GRAMMAR_VERSION
new file mode 100644
index 00000000..a3fe6bb1
--- /dev/null
+++ b/custom_mutators/grammar_mutator/GRAMMAR_VERSION
@@ -0,0 +1 @@
+b3c4fcf
diff --git a/custom_mutators/grammar_mutator/README.md b/custom_mutators/grammar_mutator/README.md
new file mode 100644
index 00000000..a015744c
--- /dev/null
+++ b/custom_mutators/grammar_mutator/README.md
@@ -0,0 +1,6 @@
+# Grammar-Mutator
+
+This is just a stub directory that will clone the real grammar mutator
+directory.
+
+Execute `./build_grammar_mutator.sh` to set everything up.
diff --git a/custom_mutators/grammar_mutator/build_grammar_mutator.sh b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
new file mode 100644
index 00000000..b097ebd3
--- /dev/null
+++ b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
@@ -0,0 +1,141 @@
+#!/bin/sh
+#
+# american fuzzy lop++ - unicorn mode build script
+# ------------------------------------------------
+#
+# Originally written by Nathan Voss <njvoss99@gmail.com>
+#
+# Adapted from code by Andrew Griffiths <agriffiths@google.com> and
+#                      Michal Zalewski
+#
+# Adapted for AFLplusplus by Dominik Maier <mail@dmnk.co>
+#
+# CompareCoverage and NeverZero counters by Andrea Fioraldi
+#                                <andreafioraldi@gmail.com>
+#
+# Copyright 2017 Battelle Memorial Institute. All rights reserved.
+# Copyright 2019-2020 AFLplusplus Project. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# This script downloads, patches, and builds a version of Unicorn with
+# minor tweaks to allow Unicorn-emulated binaries to be run under
+# afl-fuzz.
+#
+# The modifications reside in patches/*. The standalone Unicorn library
+# will be written to /usr/lib/libunicornafl.so, and the Python bindings
+# will be installed system-wide.
+#
+# You must make sure that Unicorn Engine is not already installed before
+# running this script. If it is, please uninstall it first.
+
+GRAMMAR_VERSION="$(cat ./GRAMMAR_VERSION)"
+GRAMMAR_REPO="https://github.com/AFLplusplus/grammar-mutator"
+
+echo "================================================="
+echo "Grammar Mutator build script"
+echo "================================================="
+echo
+
+echo "[*] Performing basic sanity checks..."
+
+PLT=`uname -s`
+
+if [ ! -f "../../config.h" ]; then
+
+  echo "[-] Error: key files not found - wrong working directory?"
+  exit 1
+
+fi
+
+PYTHONBIN=`command -v python3 || command -v python || command -v python2 || echo python3`
+MAKECMD=make
+TARCMD=tar
+
+if [ "$PLT" = "Darwin" ]; then
+  CORES=`sysctl -n hw.ncpu`
+  TARCMD=tar
+fi
+
+if [ "$PLT" = "FreeBSD" ]; then
+  MAKECMD=gmake
+  CORES=`sysctl -n hw.ncpu`
+  TARCMD=gtar
+fi
+
+if [ "$PLT" = "NetBSD" ] || [ "$PLT" = "OpenBSD" ]; then
+  MAKECMD=gmake
+  CORES=`sysctl -n hw.ncpu`
+  TARCMD=gtar
+fi
+
+PREREQ_NOTFOUND=
+for i in git $MAKECMD $TARCMD; do
+
+  T=`command -v "$i" 2>/dev/null`
+
+  if [ "$T" = "" ]; then
+
+    echo "[-] Error: '$i' not found. Run 'sudo apt-get install $i' or similar."
+    PREREQ_NOTFOUND=1
+
+  fi
+
+done
+
+if echo "$CC" | grep -qF /afl-; then
+
+  echo "[-] Error: do not use afl-gcc or afl-clang to compile this tool."
+  PREREQ_NOTFOUND=1
+
+fi
+
+if [ "$PREREQ_NOTFOUND" = "1" ]; then
+  exit 1
+fi
+
+echo "[+] All checks passed!"
+
+echo "[*] Making sure grammar mutator is checked out"
+
+git status 1>/dev/null 2>/dev/null
+if [ $? -eq 0 ]; then
+  echo "[*] initializing grammar mutator submodule"
+  git submodule init || exit 1
+  git submodule update ./grammar_mutator 2>/dev/null # ignore errors
+else
+  echo "[*] cloning grammar mutator"
+  test -d grammar_mutator || {
+    CNT=1
+    while [ '!' -d grammar_mutator -a "$CNT" -lt 4 ]; do
+      echo "Trying to clone grammar_mutator (attempt $CNT/3)"
+      git clone --depth=1 "$GRAMMAR_REPO" 
+      CNT=`expr "$CNT" + 1`
+    done
+  }
+fi
+
+test -d grammar_mutator || { echo "[-] not checked out, please install git or check your internet connection." ; exit 1 ; }
+echo "[+] Got grammar mutator."
+
+cd "grammar_mutator" || exit 1
+echo "[*] Checking out $GRAMMAR_VERSION"
+sh -c 'git stash && git stash drop' 1>/dev/null 2>/dev/null
+git checkout "$GRAMMAR_VERSION" || exit 1
+cd ..
+
+echo "[*] Downloading antlr..."
+wget -c https://www.antlr.org/download/antlr-4.8-complete.jar
+
+echo
+echo
+echo "[+] All successfully prepared!"
+echo "[!] To build for your grammar just do:"
+echo "    `cd grammar_mutator`"
+echo "    `make GRAMMAR_FILE=/path/to/your/grammar`"
+echo "[+] You will find a JSON and RUBY grammar in grammar_mutator/grammars to play with."
+echo
diff --git a/custom_mutators/grammar_mutator/grammar_mutator b/custom_mutators/grammar_mutator/grammar_mutator
new file mode 160000
index 00000000..b3c4fcfa
--- /dev/null
+++ b/custom_mutators/grammar_mutator/grammar_mutator
@@ -0,0 +1 @@
+Subproject commit b3c4fcfa6ae28918bc410f7747135eafd4fb7263
diff --git a/custom_mutators/grammar_mutator/update_grammar_ref.sh b/custom_mutators/grammar_mutator/update_grammar_ref.sh
new file mode 100644
index 00000000..478a73a8
--- /dev/null
+++ b/custom_mutators/grammar_mutator/update_grammar_ref.sh
@@ -0,0 +1,50 @@
+#/bin/sh
+
+##################################################
+# AFL++ tool to update a git ref.
+# Usage: ./<script>.sh <new commit hash>
+# If no commit hash was provided, it'll take HEAD.
+##################################################
+
+TOOL="grammar mutator"
+VERSION_FILE='./GRAMMAR_VERSION'
+REPO_FOLDER='./grammar_mutator'
+THIS_SCRIPT=`basename $0`
+BRANCH="stable"
+
+NEW_VERSION="$1"
+
+if [ "$NEW_VERSION" = "-h" ]; then
+  echo "Internal script to update bound $TOOL version."
+  echo
+  echo "Usage: $THIS_SCRIPT <new commit hash>"
+  echo "If no commit hash is provided, will use HEAD."
+  echo "-h to show this help screen."
+  exit 1
+fi
+
+git submodule init && git submodule update ./grammar_mutator || exit 1
+cd "$REPO_FOLDER" || exit 1
+git fetch origin $BRANCH 1>/dev/null || exit 1
+git stash 1>/dev/null 2>/dev/null
+git stash drop 1>/dev/null 2>/dev/null
+git checkout $BRANCH
+
+if [ -z "$NEW_VERSION" ]; then
+  # No version provided, take HEAD.
+  NEW_VERSION=$(git rev-parse --short HEAD)
+fi
+
+if [ -z "$NEW_VERSION" ]; then
+  echo "Error getting version."
+  exit 1
+fi
+
+git checkout "$NEW_VERSION" || exit 1
+
+cd ..
+
+rm "$VERSION_FILE"
+echo "$NEW_VERSION" > "$VERSION_FILE"
+
+echo "Done. New $TOOL version is $NEW_VERSION."
diff --git a/qemu_mode/build_qemu_support.sh b/qemu_mode/build_qemu_support.sh
index 683026bb..c24cc995 100755
--- a/qemu_mode/build_qemu_support.sh
+++ b/qemu_mode/build_qemu_support.sh
@@ -114,7 +114,7 @@ git status 1>/dev/null 2>/dev/null
 if [ $? -eq 0 ]; then
   echo "[*] initializing qemuafl submodule"
   git submodule init || exit 1
-  git submodule update 2>/dev/null # ignore errors
+  git submodule update ./qemuafl 2>/dev/null # ignore errors
 else
   echo "[*] cloning qemuafl"
   test -d qemuafl || {
diff --git a/unicorn_mode/build_unicorn_support.sh b/unicorn_mode/build_unicorn_support.sh
index f1306a06..b59786b6 100755
--- a/unicorn_mode/build_unicorn_support.sh
+++ b/unicorn_mode/build_unicorn_support.sh
@@ -156,7 +156,7 @@ else
     CNT=1
     while [ '!' -d unicornafl -a "$CNT" -lt 4 ]; do
       echo "Trying to clone unicornafl (attempt $CNT/3)"
-      git clone https://github.com/AFLplusplus/unicornafl
+      git clone --depth=1 https://github.com/AFLplusplus/unicornafl
       CNT=`expr "$CNT" + 1`
     done
   }
-- 
cgit 1.4.1


From 8999023432b515e62b5074e5cba1ad2c5d866753 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 8 Dec 2020 12:29:47 +0100
Subject: fixes for grammar scripts

---
 custom_mutators/grammar_mutator/build_grammar_mutator.sh | 2 +-
 custom_mutators/grammar_mutator/update_grammar_ref.sh    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 custom_mutators/grammar_mutator/build_grammar_mutator.sh
 mode change 100644 => 100755 custom_mutators/grammar_mutator/update_grammar_ref.sh

(limited to 'custom_mutators')

diff --git a/custom_mutators/grammar_mutator/build_grammar_mutator.sh b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
old mode 100644
new mode 100755
index b097ebd3..9251ff24
--- a/custom_mutators/grammar_mutator/build_grammar_mutator.sh
+++ b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
@@ -113,7 +113,7 @@ else
     CNT=1
     while [ '!' -d grammar_mutator -a "$CNT" -lt 4 ]; do
       echo "Trying to clone grammar_mutator (attempt $CNT/3)"
-      git clone --depth=1 "$GRAMMAR_REPO" 
+      git clone "$GRAMMAR_REPO" 
       CNT=`expr "$CNT" + 1`
     done
   }
diff --git a/custom_mutators/grammar_mutator/update_grammar_ref.sh b/custom_mutators/grammar_mutator/update_grammar_ref.sh
old mode 100644
new mode 100755
index 478a73a8..89067b13
--- a/custom_mutators/grammar_mutator/update_grammar_ref.sh
+++ b/custom_mutators/grammar_mutator/update_grammar_ref.sh
@@ -1,4 +1,4 @@
-#/bin/sh
+#!/bin/sh
 
 ##################################################
 # AFL++ tool to update a git ref.
-- 
cgit 1.4.1


From 6d2ac3e3140faf8796fa569c36a715d4743c3988 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 8 Dec 2020 12:36:19 +0100
Subject: fix grammar download script

---
 .../grammar_mutator/build_grammar_mutator.sh        | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/grammar_mutator/build_grammar_mutator.sh b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
index 9251ff24..ef145dfe 100755
--- a/custom_mutators/grammar_mutator/build_grammar_mutator.sh
+++ b/custom_mutators/grammar_mutator/build_grammar_mutator.sh
@@ -106,36 +106,35 @@ git status 1>/dev/null 2>/dev/null
 if [ $? -eq 0 ]; then
   echo "[*] initializing grammar mutator submodule"
   git submodule init || exit 1
-  git submodule update ./grammar_mutator 2>/dev/null # ignore errors
+  git submodule update ./grammar-mutator 2>/dev/null # ignore errors
 else
   echo "[*] cloning grammar mutator"
-  test -d grammar_mutator || {
+  test -d grammar-mutator || {
     CNT=1
-    while [ '!' -d grammar_mutator -a "$CNT" -lt 4 ]; do
-      echo "Trying to clone grammar_mutator (attempt $CNT/3)"
+    while [ '!' -d grammar-mutator -a "$CNT" -lt 4 ]; do
+      echo "Trying to clone grammar-mutator (attempt $CNT/3)"
       git clone "$GRAMMAR_REPO" 
       CNT=`expr "$CNT" + 1`
     done
   }
 fi
 
-test -d grammar_mutator || { echo "[-] not checked out, please install git or check your internet connection." ; exit 1 ; }
+test -d grammar-mutator || { echo "[-] not checked out, please install git or check your internet connection." ; exit 1 ; }
 echo "[+] Got grammar mutator."
 
-cd "grammar_mutator" || exit 1
+cd "grammar-mutator" || exit 1
 echo "[*] Checking out $GRAMMAR_VERSION"
 sh -c 'git stash && git stash drop' 1>/dev/null 2>/dev/null
 git checkout "$GRAMMAR_VERSION" || exit 1
-cd ..
-
 echo "[*] Downloading antlr..."
 wget -c https://www.antlr.org/download/antlr-4.8-complete.jar
+cd ..
 
 echo
 echo
 echo "[+] All successfully prepared!"
 echo "[!] To build for your grammar just do:"
-echo "    `cd grammar_mutator`"
-echo "    `make GRAMMAR_FILE=/path/to/your/grammar`"
-echo "[+] You will find a JSON and RUBY grammar in grammar_mutator/grammars to play with."
+echo "      cd grammar-mutator"
+echo "      make GRAMMAR_FILE=/path/to/your/grammar"
+echo "[+] You will find a JSON and RUBY grammar in grammar-mutator/grammars to play with."
 echo
-- 
cgit 1.4.1


From 33a7d6f1688856c050b0ac71ac1df4018e4d531c Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Mon, 4 Jan 2021 15:14:20 +0100
Subject: code cleanups (from cppcheck)

---
 custom_mutators/honggfuzz/mangle.c                |  2 +-
 custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp | 10 +++++-----
 custom_mutators/libfuzzer/FuzzerDefs.h            |  2 +-
 custom_mutators/libfuzzer/FuzzerDictionary.h      |  4 ++--
 custom_mutators/libfuzzer/FuzzerRandom.h          |  2 +-
 custom_mutators/libfuzzer/FuzzerTracePC.h         |  8 ++++----
 include/debug.h                                   |  6 +++---
 unicorn_mode/unicornafl                           |  2 +-
 utils/defork/defork.c                             |  2 +-
 utils/persistent_mode/Makefile                    |  8 ++++----
 utils/qemu_persistent_hook/test.c                 |  2 +-
 11 files changed, 24 insertions(+), 24 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index c2988319..9c3d1ed4 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -995,7 +995,7 @@ void mangle_mangleContent(run_t *run, int speed_factor) {
 
   }
 
-  uint64_t changesCnt = run->global->mutate.mutationsPerRun;
+  uint64_t changesCnt;
 
   if (speed_factor < 5) {
 
diff --git a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
index 797a52a7..489665f7 100644
--- a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
+++ b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
@@ -246,7 +246,7 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
 
   }
 
-  if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
+  if (FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
     return false;
 
   // Read traces.
@@ -259,8 +259,8 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
     if (!CorporaHashes.count(Name)) continue;  // not in the corpus.
     NumTraceFiles++;
     // Printf("=== %s\n", Name.c_str());
-    std::ifstream IF(SF.File);
-    while (std::getline(IF, L, '\n')) {
+    std::ifstream IF2(SF.File);
+    while (std::getline(IF2, L, '\n')) {
 
       size_t      FunctionNum = 0;
       std::string DFTString;
@@ -314,8 +314,8 @@ int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
     // we then request tags in [0,Size/2) and [Size/2, Size), and so on.
     // Function number => DFT.
     auto OutPath = DirPlusFile(DirPath, Hash(FileToVector(F.File)));
-    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
-    std::unordered_set<std::string>             Cov;
+//    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
+//    std::unordered_set<std::string>             Cov;
     Command                                     Cmd;
     Cmd.addArgument(DFTBinary);
     Cmd.addArgument(F.File);
diff --git a/custom_mutators/libfuzzer/FuzzerDefs.h b/custom_mutators/libfuzzer/FuzzerDefs.h
index 1a2752af..3952ac51 100644
--- a/custom_mutators/libfuzzer/FuzzerDefs.h
+++ b/custom_mutators/libfuzzer/FuzzerDefs.h
@@ -46,7 +46,7 @@ template<typename T>
       fuzzer_allocator() = default;
 
       template<class U>
-      fuzzer_allocator(const fuzzer_allocator<U>&) {}
+      explicit fuzzer_allocator(const fuzzer_allocator<U>&) {}
 
       template<class Other>
       struct rebind { typedef fuzzer_allocator<Other> other;  };
diff --git a/custom_mutators/libfuzzer/FuzzerDictionary.h b/custom_mutators/libfuzzer/FuzzerDictionary.h
index 301c5d9a..ddd2d2f1 100644
--- a/custom_mutators/libfuzzer/FuzzerDictionary.h
+++ b/custom_mutators/libfuzzer/FuzzerDictionary.h
@@ -49,7 +49,7 @@ typedef FixedWord<64> Word;
 class DictionaryEntry {
  public:
   DictionaryEntry() {}
-  DictionaryEntry(Word W) : W(W) {}
+  explicit DictionaryEntry(Word W) : W(W) {}
   DictionaryEntry(Word W, size_t PositionHint) : W(W), PositionHint(PositionHint) {}
   const Word &GetW() const { return W; }
 
@@ -92,7 +92,7 @@ class Dictionary {
     assert(Idx < Size);
     return DE[Idx];
   }
-  void push_back(DictionaryEntry DE) {
+  void push_back(const DictionaryEntry &DE) {
     if (Size < kMaxDictSize)
       this->DE[Size++] = DE;
   }
diff --git a/custom_mutators/libfuzzer/FuzzerRandom.h b/custom_mutators/libfuzzer/FuzzerRandom.h
index 659283ee..7b1e1b1d 100644
--- a/custom_mutators/libfuzzer/FuzzerRandom.h
+++ b/custom_mutators/libfuzzer/FuzzerRandom.h
@@ -16,7 +16,7 @@
 namespace fuzzer {
 class Random : public std::minstd_rand {
  public:
-  Random(unsigned int seed) : std::minstd_rand(seed) {}
+  explicit Random(unsigned int seed) : std::minstd_rand(seed) {}
   result_type operator()() { return this->std::minstd_rand::operator()(); }
   size_t Rand() { return this->operator()(); }
   size_t RandBool() { return Rand() % 2; }
diff --git a/custom_mutators/libfuzzer/FuzzerTracePC.h b/custom_mutators/libfuzzer/FuzzerTracePC.h
index 4601300c..a58fdf8d 100644
--- a/custom_mutators/libfuzzer/FuzzerTracePC.h
+++ b/custom_mutators/libfuzzer/FuzzerTracePC.h
@@ -145,10 +145,10 @@ private:
     };
     Region *Regions;
     size_t NumRegions;
-    uint8_t *Start() { return Regions[0].Start; }
-    uint8_t *Stop()  { return Regions[NumRegions - 1].Stop; }
-    size_t Size()   { return Stop() - Start(); }
-    size_t  Idx(uint8_t *P) {
+    uint8_t *Start() const { return Regions[0].Start; }
+    uint8_t *Stop()  const { return Regions[NumRegions - 1].Stop; }
+    size_t Size()    const { return Stop() - Start(); }
+    size_t  Idx(uint8_t *P) const {
       assert(P >= Start() && P < Stop());
       return P - Start();
     }
diff --git a/include/debug.h b/include/debug.h
index 7f4a6be1..ef5b195b 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -295,7 +295,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%u\n\n", __func__, \
+    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%d\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     exit(1);                                                             \
                                                                          \
@@ -308,7 +308,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     abort();                                                             \
                                                                          \
@@ -322,7 +322,7 @@ static inline const char *colorfilter(const char *x) {
     fflush(stdout);                                                    \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                          \
          "\n[-]  SYSTEM ERROR : " cRST   x);                             \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n", __func__, \
          __FILE__, __LINE__);                                          \
     SAYF(cLRD "       OS message : " cRST "%s\n", strerror(errno));    \
     exit(1);                                                           \
diff --git a/unicorn_mode/unicornafl b/unicorn_mode/unicornafl
index 8cca4801..768e6bb2 160000
--- a/unicorn_mode/unicornafl
+++ b/unicorn_mode/unicornafl
@@ -1 +1 @@
-Subproject commit 8cca4801adb767dce7cf72202d7d25bdb420cf7d
+Subproject commit 768e6bb29b7cb98bb2b9c4526ae3d234db5c1615
diff --git a/utils/defork/defork.c b/utils/defork/defork.c
index f71d1124..f50b9a4b 100644
--- a/utils/defork/defork.c
+++ b/utils/defork/defork.c
@@ -1,4 +1,4 @@
-#define __GNU_SOURCE
+#define _GNU_SOURCE
 #include <dlfcn.h>
 #include <unistd.h>
 #include <stdio.h>
diff --git a/utils/persistent_mode/Makefile b/utils/persistent_mode/Makefile
index 6fa1c30e..e348c46c 100644
--- a/utils/persistent_mode/Makefile
+++ b/utils/persistent_mode/Makefile
@@ -1,10 +1,10 @@
 all:
-	afl-clang-fast -o persistent_demo persistent_demo.c
-	afl-clang-fast -o persistent_demo_new persistent_demo_new.c
-	AFL_DONT_OPTIMIZE=1 afl-clang-fast -o test-instr test-instr.c
+	../../afl-clang-fast -o persistent_demo persistent_demo.c
+	../../afl-clang-fast -o persistent_demo_new persistent_demo_new.c
+	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -o test-instr test-instr.c
 
 document:
-	AFL_DONT_OPTIMIZE=1 afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
+	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
 
 clean:
 	rm -f persistent_demo persistent_demo_new test-instr
diff --git a/utils/qemu_persistent_hook/test.c b/utils/qemu_persistent_hook/test.c
index afeff202..a0e815dc 100644
--- a/utils/qemu_persistent_hook/test.c
+++ b/utils/qemu_persistent_hook/test.c
@@ -2,7 +2,7 @@
 
 int target_func(unsigned char *buf, int size) {
 
-  printf("buffer:%p, size:%p\n", buf, size);
+  printf("buffer:%p, size:%d\n", buf, size);
   switch (buf[0]) {
 
     case 1:
-- 
cgit 1.4.1


From 5cdbfeef4a84b9dc2e5f8e88ee018c6c6e72fa44 Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Mon, 4 Jan 2021 15:17:39 +0100
Subject: Revert "code cleanups (from cppcheck)"

This reverts commit 33a7d6f1688856c050b0ac71ac1df4018e4d531c.
---
 custom_mutators/honggfuzz/mangle.c                |  2 +-
 custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp | 10 +++++-----
 custom_mutators/libfuzzer/FuzzerDefs.h            |  2 +-
 custom_mutators/libfuzzer/FuzzerDictionary.h      |  4 ++--
 custom_mutators/libfuzzer/FuzzerRandom.h          |  2 +-
 custom_mutators/libfuzzer/FuzzerTracePC.h         |  8 ++++----
 include/debug.h                                   |  6 +++---
 unicorn_mode/unicornafl                           |  2 +-
 utils/defork/defork.c                             |  2 +-
 utils/persistent_mode/Makefile                    |  8 ++++----
 utils/qemu_persistent_hook/test.c                 |  2 +-
 11 files changed, 24 insertions(+), 24 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index 9c3d1ed4..c2988319 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -995,7 +995,7 @@ void mangle_mangleContent(run_t *run, int speed_factor) {
 
   }
 
-  uint64_t changesCnt;
+  uint64_t changesCnt = run->global->mutate.mutationsPerRun;
 
   if (speed_factor < 5) {
 
diff --git a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
index 489665f7..797a52a7 100644
--- a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
+++ b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
@@ -246,7 +246,7 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
 
   }
 
-  if (FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
+  if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
     return false;
 
   // Read traces.
@@ -259,8 +259,8 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
     if (!CorporaHashes.count(Name)) continue;  // not in the corpus.
     NumTraceFiles++;
     // Printf("=== %s\n", Name.c_str());
-    std::ifstream IF2(SF.File);
-    while (std::getline(IF2, L, '\n')) {
+    std::ifstream IF(SF.File);
+    while (std::getline(IF, L, '\n')) {
 
       size_t      FunctionNum = 0;
       std::string DFTString;
@@ -314,8 +314,8 @@ int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
     // we then request tags in [0,Size/2) and [Size/2, Size), and so on.
     // Function number => DFT.
     auto OutPath = DirPlusFile(DirPath, Hash(FileToVector(F.File)));
-//    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
-//    std::unordered_set<std::string>             Cov;
+    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
+    std::unordered_set<std::string>             Cov;
     Command                                     Cmd;
     Cmd.addArgument(DFTBinary);
     Cmd.addArgument(F.File);
diff --git a/custom_mutators/libfuzzer/FuzzerDefs.h b/custom_mutators/libfuzzer/FuzzerDefs.h
index 3952ac51..1a2752af 100644
--- a/custom_mutators/libfuzzer/FuzzerDefs.h
+++ b/custom_mutators/libfuzzer/FuzzerDefs.h
@@ -46,7 +46,7 @@ template<typename T>
       fuzzer_allocator() = default;
 
       template<class U>
-      explicit fuzzer_allocator(const fuzzer_allocator<U>&) {}
+      fuzzer_allocator(const fuzzer_allocator<U>&) {}
 
       template<class Other>
       struct rebind { typedef fuzzer_allocator<Other> other;  };
diff --git a/custom_mutators/libfuzzer/FuzzerDictionary.h b/custom_mutators/libfuzzer/FuzzerDictionary.h
index ddd2d2f1..301c5d9a 100644
--- a/custom_mutators/libfuzzer/FuzzerDictionary.h
+++ b/custom_mutators/libfuzzer/FuzzerDictionary.h
@@ -49,7 +49,7 @@ typedef FixedWord<64> Word;
 class DictionaryEntry {
  public:
   DictionaryEntry() {}
-  explicit DictionaryEntry(Word W) : W(W) {}
+  DictionaryEntry(Word W) : W(W) {}
   DictionaryEntry(Word W, size_t PositionHint) : W(W), PositionHint(PositionHint) {}
   const Word &GetW() const { return W; }
 
@@ -92,7 +92,7 @@ class Dictionary {
     assert(Idx < Size);
     return DE[Idx];
   }
-  void push_back(const DictionaryEntry &DE) {
+  void push_back(DictionaryEntry DE) {
     if (Size < kMaxDictSize)
       this->DE[Size++] = DE;
   }
diff --git a/custom_mutators/libfuzzer/FuzzerRandom.h b/custom_mutators/libfuzzer/FuzzerRandom.h
index 7b1e1b1d..659283ee 100644
--- a/custom_mutators/libfuzzer/FuzzerRandom.h
+++ b/custom_mutators/libfuzzer/FuzzerRandom.h
@@ -16,7 +16,7 @@
 namespace fuzzer {
 class Random : public std::minstd_rand {
  public:
-  explicit Random(unsigned int seed) : std::minstd_rand(seed) {}
+  Random(unsigned int seed) : std::minstd_rand(seed) {}
   result_type operator()() { return this->std::minstd_rand::operator()(); }
   size_t Rand() { return this->operator()(); }
   size_t RandBool() { return Rand() % 2; }
diff --git a/custom_mutators/libfuzzer/FuzzerTracePC.h b/custom_mutators/libfuzzer/FuzzerTracePC.h
index a58fdf8d..4601300c 100644
--- a/custom_mutators/libfuzzer/FuzzerTracePC.h
+++ b/custom_mutators/libfuzzer/FuzzerTracePC.h
@@ -145,10 +145,10 @@ private:
     };
     Region *Regions;
     size_t NumRegions;
-    uint8_t *Start() const { return Regions[0].Start; }
-    uint8_t *Stop()  const { return Regions[NumRegions - 1].Stop; }
-    size_t Size()    const { return Stop() - Start(); }
-    size_t  Idx(uint8_t *P) const {
+    uint8_t *Start() { return Regions[0].Start; }
+    uint8_t *Stop()  { return Regions[NumRegions - 1].Stop; }
+    size_t Size()   { return Stop() - Start(); }
+    size_t  Idx(uint8_t *P) {
       assert(P >= Start() && P < Stop());
       return P - Start();
     }
diff --git a/include/debug.h b/include/debug.h
index ef5b195b..7f4a6be1 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -295,7 +295,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%d\n\n", __func__, \
+    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%u\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     exit(1);                                                             \
                                                                          \
@@ -308,7 +308,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     abort();                                                             \
                                                                          \
@@ -322,7 +322,7 @@ static inline const char *colorfilter(const char *x) {
     fflush(stdout);                                                    \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                          \
          "\n[-]  SYSTEM ERROR : " cRST   x);                             \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n", __func__, \
          __FILE__, __LINE__);                                          \
     SAYF(cLRD "       OS message : " cRST "%s\n", strerror(errno));    \
     exit(1);                                                           \
diff --git a/unicorn_mode/unicornafl b/unicorn_mode/unicornafl
index 768e6bb2..8cca4801 160000
--- a/unicorn_mode/unicornafl
+++ b/unicorn_mode/unicornafl
@@ -1 +1 @@
-Subproject commit 768e6bb29b7cb98bb2b9c4526ae3d234db5c1615
+Subproject commit 8cca4801adb767dce7cf72202d7d25bdb420cf7d
diff --git a/utils/defork/defork.c b/utils/defork/defork.c
index f50b9a4b..f71d1124 100644
--- a/utils/defork/defork.c
+++ b/utils/defork/defork.c
@@ -1,4 +1,4 @@
-#define _GNU_SOURCE
+#define __GNU_SOURCE
 #include <dlfcn.h>
 #include <unistd.h>
 #include <stdio.h>
diff --git a/utils/persistent_mode/Makefile b/utils/persistent_mode/Makefile
index e348c46c..6fa1c30e 100644
--- a/utils/persistent_mode/Makefile
+++ b/utils/persistent_mode/Makefile
@@ -1,10 +1,10 @@
 all:
-	../../afl-clang-fast -o persistent_demo persistent_demo.c
-	../../afl-clang-fast -o persistent_demo_new persistent_demo_new.c
-	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -o test-instr test-instr.c
+	afl-clang-fast -o persistent_demo persistent_demo.c
+	afl-clang-fast -o persistent_demo_new persistent_demo_new.c
+	AFL_DONT_OPTIMIZE=1 afl-clang-fast -o test-instr test-instr.c
 
 document:
-	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
+	AFL_DONT_OPTIMIZE=1 afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
 
 clean:
 	rm -f persistent_demo persistent_demo_new test-instr
diff --git a/utils/qemu_persistent_hook/test.c b/utils/qemu_persistent_hook/test.c
index a0e815dc..afeff202 100644
--- a/utils/qemu_persistent_hook/test.c
+++ b/utils/qemu_persistent_hook/test.c
@@ -2,7 +2,7 @@
 
 int target_func(unsigned char *buf, int size) {
 
-  printf("buffer:%p, size:%d\n", buf, size);
+  printf("buffer:%p, size:%p\n", buf, size);
   switch (buf[0]) {
 
     case 1:
-- 
cgit 1.4.1


From b7af98e94561ebe44ea37304a357b00499d1104d Mon Sep 17 00:00:00 2001
From: hexcoder- <heiko@hexco.de>
Date: Mon, 4 Jan 2021 15:32:22 +0100
Subject: code cleanups (from cppcheck mostly)

---
 custom_mutators/honggfuzz/mangle.c                |  2 +-
 custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp | 10 +++++-----
 custom_mutators/libfuzzer/FuzzerDefs.h            |  2 +-
 custom_mutators/libfuzzer/FuzzerDictionary.h      |  4 ++--
 custom_mutators/libfuzzer/FuzzerRandom.h          |  2 +-
 custom_mutators/libfuzzer/FuzzerTracePC.h         |  8 ++++----
 include/debug.h                                   |  6 +++---
 utils/defork/defork.c                             |  2 +-
 utils/persistent_mode/Makefile                    |  8 ++++----
 utils/qemu_persistent_hook/test.c                 |  2 +-
 10 files changed, 23 insertions(+), 23 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index c2988319..9c3d1ed4 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -995,7 +995,7 @@ void mangle_mangleContent(run_t *run, int speed_factor) {
 
   }
 
-  uint64_t changesCnt = run->global->mutate.mutationsPerRun;
+  uint64_t changesCnt;
 
   if (speed_factor < 5) {
 
diff --git a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
index 797a52a7..489665f7 100644
--- a/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
+++ b/custom_mutators/libfuzzer/FuzzerDataFlowTrace.cpp
@@ -246,7 +246,7 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
 
   }
 
-  if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
+  if (FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
     return false;
 
   // Read traces.
@@ -259,8 +259,8 @@ bool DataFlowTrace::Init(const std::string &DirPath, std::string *FocusFunction,
     if (!CorporaHashes.count(Name)) continue;  // not in the corpus.
     NumTraceFiles++;
     // Printf("=== %s\n", Name.c_str());
-    std::ifstream IF(SF.File);
-    while (std::getline(IF, L, '\n')) {
+    std::ifstream IF2(SF.File);
+    while (std::getline(IF2, L, '\n')) {
 
       size_t      FunctionNum = 0;
       std::string DFTString;
@@ -314,8 +314,8 @@ int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
     // we then request tags in [0,Size/2) and [Size/2, Size), and so on.
     // Function number => DFT.
     auto OutPath = DirPlusFile(DirPath, Hash(FileToVector(F.File)));
-    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
-    std::unordered_set<std::string>             Cov;
+//    std::unordered_map<size_t, Vector<uint8_t>> DFTMap;
+//    std::unordered_set<std::string>             Cov;
     Command                                     Cmd;
     Cmd.addArgument(DFTBinary);
     Cmd.addArgument(F.File);
diff --git a/custom_mutators/libfuzzer/FuzzerDefs.h b/custom_mutators/libfuzzer/FuzzerDefs.h
index 1a2752af..3952ac51 100644
--- a/custom_mutators/libfuzzer/FuzzerDefs.h
+++ b/custom_mutators/libfuzzer/FuzzerDefs.h
@@ -46,7 +46,7 @@ template<typename T>
       fuzzer_allocator() = default;
 
       template<class U>
-      fuzzer_allocator(const fuzzer_allocator<U>&) {}
+      explicit fuzzer_allocator(const fuzzer_allocator<U>&) {}
 
       template<class Other>
       struct rebind { typedef fuzzer_allocator<Other> other;  };
diff --git a/custom_mutators/libfuzzer/FuzzerDictionary.h b/custom_mutators/libfuzzer/FuzzerDictionary.h
index 301c5d9a..ddd2d2f1 100644
--- a/custom_mutators/libfuzzer/FuzzerDictionary.h
+++ b/custom_mutators/libfuzzer/FuzzerDictionary.h
@@ -49,7 +49,7 @@ typedef FixedWord<64> Word;
 class DictionaryEntry {
  public:
   DictionaryEntry() {}
-  DictionaryEntry(Word W) : W(W) {}
+  explicit DictionaryEntry(Word W) : W(W) {}
   DictionaryEntry(Word W, size_t PositionHint) : W(W), PositionHint(PositionHint) {}
   const Word &GetW() const { return W; }
 
@@ -92,7 +92,7 @@ class Dictionary {
     assert(Idx < Size);
     return DE[Idx];
   }
-  void push_back(DictionaryEntry DE) {
+  void push_back(const DictionaryEntry &DE) {
     if (Size < kMaxDictSize)
       this->DE[Size++] = DE;
   }
diff --git a/custom_mutators/libfuzzer/FuzzerRandom.h b/custom_mutators/libfuzzer/FuzzerRandom.h
index 659283ee..7b1e1b1d 100644
--- a/custom_mutators/libfuzzer/FuzzerRandom.h
+++ b/custom_mutators/libfuzzer/FuzzerRandom.h
@@ -16,7 +16,7 @@
 namespace fuzzer {
 class Random : public std::minstd_rand {
  public:
-  Random(unsigned int seed) : std::minstd_rand(seed) {}
+  explicit Random(unsigned int seed) : std::minstd_rand(seed) {}
   result_type operator()() { return this->std::minstd_rand::operator()(); }
   size_t Rand() { return this->operator()(); }
   size_t RandBool() { return Rand() % 2; }
diff --git a/custom_mutators/libfuzzer/FuzzerTracePC.h b/custom_mutators/libfuzzer/FuzzerTracePC.h
index 4601300c..a58fdf8d 100644
--- a/custom_mutators/libfuzzer/FuzzerTracePC.h
+++ b/custom_mutators/libfuzzer/FuzzerTracePC.h
@@ -145,10 +145,10 @@ private:
     };
     Region *Regions;
     size_t NumRegions;
-    uint8_t *Start() { return Regions[0].Start; }
-    uint8_t *Stop()  { return Regions[NumRegions - 1].Stop; }
-    size_t Size()   { return Stop() - Start(); }
-    size_t  Idx(uint8_t *P) {
+    uint8_t *Start() const { return Regions[0].Start; }
+    uint8_t *Stop()  const { return Regions[NumRegions - 1].Stop; }
+    size_t Size()    const { return Stop() - Start(); }
+    size_t  Idx(uint8_t *P) const {
       assert(P >= Start() && P < Stop());
       return P - Start();
     }
diff --git a/include/debug.h b/include/debug.h
index 7f4a6be1..ef5b195b 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -295,7 +295,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%u\n\n", __func__, \
+    SAYF(cLRD "\n         Location : " cRST "%s(), %s:%d\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     exit(1);                                                             \
                                                                          \
@@ -308,7 +308,7 @@ static inline const char *colorfilter(const char *x) {
                                                                          \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                            \
          "\n[-] PROGRAM ABORT : " cRST   x);                               \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n\n", __func__, \
          __FILE__, __LINE__);                                            \
     abort();                                                             \
                                                                          \
@@ -322,7 +322,7 @@ static inline const char *colorfilter(const char *x) {
     fflush(stdout);                                                    \
     SAYF(bSTOP RESET_G1 CURSOR_SHOW cRST cLRD                          \
          "\n[-]  SYSTEM ERROR : " cRST   x);                             \
-    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%u\n", __func__, \
+    SAYF(cLRD "\n    Stop location : " cRST "%s(), %s:%d\n", __func__, \
          __FILE__, __LINE__);                                          \
     SAYF(cLRD "       OS message : " cRST "%s\n", strerror(errno));    \
     exit(1);                                                           \
diff --git a/utils/defork/defork.c b/utils/defork/defork.c
index f71d1124..f50b9a4b 100644
--- a/utils/defork/defork.c
+++ b/utils/defork/defork.c
@@ -1,4 +1,4 @@
-#define __GNU_SOURCE
+#define _GNU_SOURCE
 #include <dlfcn.h>
 #include <unistd.h>
 #include <stdio.h>
diff --git a/utils/persistent_mode/Makefile b/utils/persistent_mode/Makefile
index 6fa1c30e..e348c46c 100644
--- a/utils/persistent_mode/Makefile
+++ b/utils/persistent_mode/Makefile
@@ -1,10 +1,10 @@
 all:
-	afl-clang-fast -o persistent_demo persistent_demo.c
-	afl-clang-fast -o persistent_demo_new persistent_demo_new.c
-	AFL_DONT_OPTIMIZE=1 afl-clang-fast -o test-instr test-instr.c
+	../../afl-clang-fast -o persistent_demo persistent_demo.c
+	../../afl-clang-fast -o persistent_demo_new persistent_demo_new.c
+	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -o test-instr test-instr.c
 
 document:
-	AFL_DONT_OPTIMIZE=1 afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
+	AFL_DONT_OPTIMIZE=1 ../../afl-clang-fast -D_AFL_DOCUMENT_MUTATIONS -o test-instr test-instr.c
 
 clean:
 	rm -f persistent_demo persistent_demo_new test-instr
diff --git a/utils/qemu_persistent_hook/test.c b/utils/qemu_persistent_hook/test.c
index afeff202..a0e815dc 100644
--- a/utils/qemu_persistent_hook/test.c
+++ b/utils/qemu_persistent_hook/test.c
@@ -2,7 +2,7 @@
 
 int target_func(unsigned char *buf, int size) {
 
-  printf("buffer:%p, size:%p\n", buf, size);
+  printf("buffer:%p, size:%d\n", buf, size);
   switch (buf[0]) {
 
     case 1:
-- 
cgit 1.4.1


From 1e2da1dfb9ca44e70416601ed5ab94ad79ce2994 Mon Sep 17 00:00:00 2001
From: Joey Jiao <joeyjiaojg@163.com>
Date: Sat, 16 Jan 2021 13:31:11 +0800
Subject: android: port libfuzzer-mutator

---
 Android.bp                 | 14 ++++++++++++++
 custom_mutators/Android.bp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 custom_mutators/Android.bp

(limited to 'custom_mutators')

diff --git a/Android.bp b/Android.bp
index 1ac9e565..bd23d1d1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -190,6 +190,16 @@ cc_library_static {
   ],
 }
 
+cc_library_headers {
+  name: "libafl_headers",
+  vendor_available: true,
+  host_supported: true,
+
+  export_include_dirs: [
+    "include",
+  ],
+}
+
 cc_prebuilt_library_static {
   name: "libfrida-gum",
   compile_multilib: "64",
@@ -255,3 +265,7 @@ cc_binary {
     "utils/afl_frida/android",
   ],
 }
+
+subdirs = [
+  "custom_mutators",
+]
diff --git a/custom_mutators/Android.bp b/custom_mutators/Android.bp
new file mode 100644
index 00000000..f2ac14b5
--- /dev/null
+++ b/custom_mutators/Android.bp
@@ -0,0 +1,44 @@
+cc_library_shared {
+  name: "libfuzzer-mutator",
+  vendor_available: true,
+  host_supported: true,
+
+  cflags: [
+    "-g",
+    "-O0",
+    "-funroll-loops",
+    "-fPIC",
+    "-fpermissive",
+    "-std=c++11",
+  ],
+
+  srcs: [
+    "libfuzzer/FuzzerCrossOver.cpp",
+    "libfuzzer/FuzzerDataFlowTrace.cpp",
+    "libfuzzer/FuzzerDriver.cpp",
+    "libfuzzer/FuzzerExtFunctionsDlsym.cpp",
+    "libfuzzer/FuzzerExtFunctionsWeak.cpp",
+    "libfuzzer/FuzzerExtFunctionsWindows.cpp",
+    "libfuzzer/FuzzerExtraCounters.cpp",
+    "libfuzzer/FuzzerFork.cpp",
+    "libfuzzer/FuzzerIO.cpp",
+    "libfuzzer/FuzzerIOPosix.cpp",
+    "libfuzzer/FuzzerIOWindows.cpp",
+    "libfuzzer/FuzzerLoop.cpp",
+    "libfuzzer/FuzzerMerge.cpp",
+    "libfuzzer/FuzzerMutate.cpp",
+    "libfuzzer/FuzzerSHA1.cpp",
+    "libfuzzer/FuzzerTracePC.cpp",
+    "libfuzzer/FuzzerUtil.cpp",
+    "libfuzzer/FuzzerUtilDarwin.cpp",
+    "libfuzzer/FuzzerUtilFuchsia.cpp",
+    "libfuzzer/FuzzerUtilLinux.cpp",
+    "libfuzzer/FuzzerUtilPosix.cpp",
+    "libfuzzer/FuzzerUtilWindows.cpp",
+    "libfuzzer/libfuzzer.cpp",
+  ],
+
+  header_libs: [
+    "libafl_headers",
+  ],
+}
-- 
cgit 1.4.1


From 9d9e148e5cb9e9118289a1d52e0b7aeff040b8bb Mon Sep 17 00:00:00 2001
From: Joey Jiao <joeyjiaojg@163.com>
Date: Sat, 16 Jan 2021 15:00:35 +0800
Subject: android: build custom mutators for symcc, radamsa

---
 custom_mutators/Android.bp | 67 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'custom_mutators')

diff --git a/custom_mutators/Android.bp b/custom_mutators/Android.bp
index f2ac14b5..11690443 100644
--- a/custom_mutators/Android.bp
+++ b/custom_mutators/Android.bp
@@ -42,3 +42,70 @@ cc_library_shared {
     "libafl_headers",
   ],
 }
+
+/*cc_library_shared {
+  name: "honggfuzz-mutator",
+  vendor_available: true,
+  host_supported: true,
+
+  cflags: [
+    "-g",
+    "-O0",
+    "-funroll-loops",
+    "-fPIC",
+    "-Wl,-Bsymbolic",
+  ],
+
+  srcs: [
+    "honggfuzz/honggfuzz.c",
+    "honggfuzz/mangle.c",
+//    "../src/afl-perfomance.c",
+  ],
+
+  header_libs: [
+    "libafl_headers",
+  ],
+}*/
+
+cc_library_shared {
+  name: "radamsa-mutator",
+  vendor_available: true,
+  host_supported: true,
+
+  cflags: [
+    "-g",
+    "-O0",
+    "-funroll-loops",
+    "-fPIC",
+  ],
+
+  srcs: [
+    "radamsa/libradamsa.c",
+    "radamsa/radamsa-mutator.c",
+  ],
+
+  header_libs: [
+    "libafl_headers",
+  ],
+}
+
+cc_library_shared {
+  name: "symcc-mutator",
+  vendor_available: true,
+  host_supported: true,
+
+  cflags: [
+    "-g",
+    "-O0",
+    "-funroll-loops",
+    "-fPIC",
+  ],
+
+  srcs: [
+    "symcc/symcc.c",
+  ],
+
+  header_libs: [
+    "libafl_headers",
+  ],
+}
-- 
cgit 1.4.1


From 7ad8f6c7176c26c4fdbd80cec33f969235055839 Mon Sep 17 00:00:00 2001
From: Joey Jiao <joeyjiaojg@163.com>
Date: Mon, 18 Jan 2021 11:05:57 +0800
Subject: android: Add libprotobuf aflpp custom_mutator example

---
 custom_mutators/Android.bp                         |   4 +
 .../libprotobuf-mutator-example/Android.bp         |  32 ++++++
 .../libprotobuf-mutator-example/README.md          |   1 +
 .../lpm_aflpp_custom_mutator_input.cc              | 118 +++++++++++++++++++++
 .../lpm_aflpp_custom_mutator_input.h               |   5 +
 .../libprotobuf-mutator-example/test.proto         |   7 ++
 custom_mutators/libprotobuf-mutator-example/vuln.c |  17 +++
 7 files changed, 184 insertions(+)
 create mode 100644 custom_mutators/libprotobuf-mutator-example/Android.bp
 create mode 100644 custom_mutators/libprotobuf-mutator-example/README.md
 create mode 100644 custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.cc
 create mode 100644 custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.h
 create mode 100644 custom_mutators/libprotobuf-mutator-example/test.proto
 create mode 100644 custom_mutators/libprotobuf-mutator-example/vuln.c

(limited to 'custom_mutators')

diff --git a/custom_mutators/Android.bp b/custom_mutators/Android.bp
index 11690443..89abc3e9 100644
--- a/custom_mutators/Android.bp
+++ b/custom_mutators/Android.bp
@@ -109,3 +109,7 @@ cc_library_shared {
     "libafl_headers",
   ],
 }
+
+subdirs = [
+  "libprotobuf-mutator-example",
+]
diff --git a/custom_mutators/libprotobuf-mutator-example/Android.bp b/custom_mutators/libprotobuf-mutator-example/Android.bp
new file mode 100644
index 00000000..01f1c23e
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/Android.bp
@@ -0,0 +1,32 @@
+cc_library_shared {
+  name: "libprotobuf-mutator-example-afl",
+  vendor_available: true,
+  host_supported: true,
+
+  cflags: [
+    "-g",
+    "-O0",
+    "-fPIC",
+    "-Wall",
+  ],
+
+  srcs: [
+    "lpm_aflpp_custom_mutator_input.cc",
+    "test.proto",
+  ],
+
+  shared_libs: [
+    "libprotobuf-cpp-full",
+    "libprotobuf-mutator",
+  ],
+}
+
+cc_binary {
+  name: "libprotobuf-mutator-vuln",
+  vendor_available: true,
+  host_supported: true,
+
+  srcs: [
+    "vuln.c",
+  ],
+}
diff --git a/custom_mutators/libprotobuf-mutator-example/README.md b/custom_mutators/libprotobuf-mutator-example/README.md
new file mode 100644
index 00000000..5a844c00
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/README.md
@@ -0,0 +1 @@
+Ported from [https://github.com/bruce30262/libprotobuf-mutator_fuzzing_learning/tree/master/5_libprotobuf_aflpp_custom_mutator_input](https://github.com/bruce30262/libprotobuf-mutator_fuzzing_learning/tree/master/5_libprotobuf_aflpp_custom_mutator_input)
diff --git a/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.cc b/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.cc
new file mode 100644
index 00000000..e0273849
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.cc
@@ -0,0 +1,118 @@
+#include "lpm_aflpp_custom_mutator_input.h"
+#include <iostream>
+#include <sstream>
+#include <fstream>
+
+using std::cin;
+using std::cout;
+using std::endl;
+
+std::string ProtoToData(const TEST &test_proto) {
+    std::stringstream all;
+    const auto &aa = test_proto.a();
+    const auto &bb = test_proto.b();
+    all.write((const char*)&aa, sizeof(aa));
+    if(bb.size() != 0) {
+        all.write(bb.c_str(), bb.size());
+    }
+
+    std::string res = all.str();
+    if (bb.size() != 0 && res.size() != 0) {
+        // set PROTO_FUZZER_DUMP_PATH env to dump the serialized protobuf
+        if (const char *dump_path = getenv("PROTO_FUZZER_DUMP_PATH")) {
+            std::ofstream of(dump_path);
+            of.write(res.data(), res.size());
+        }
+    }
+    return res;
+}
+
+/**
+ * Initialize this custom mutator
+ *
+ * @param[in] afl a pointer to the internal state object. Can be ignored for
+ * now.
+ * @param[in] seed A seed for this mutator - the same seed should always mutate
+ * in the same way.
+ * @return Pointer to the data object this custom mutator instance should use.
+ *         There may be multiple instances of this mutator in one afl-fuzz run!
+ *         Return NULL on error.
+ */
+extern "C" MyMutator *afl_custom_init(void *afl, unsigned int seed) {
+    MyMutator *mutator = new MyMutator();
+    
+    mutator->RegisterPostProcessor(
+        TEST::descriptor(),
+        [](google::protobuf::Message* message, unsigned int seed) {
+            // libprotobuf-mutator's built-in mutator is kind of....crappy :P
+            // Even a dumb fuzz like `TEST.a = rand();` is better in this case... Q_Q
+            // We register a post processor to apply our dumb fuzz
+            
+            TEST *t = static_cast<TEST *>(message);
+            t->set_a(rand());
+        });
+
+    srand(seed);
+    return mutator;
+}
+
+/**
+ * Perform custom mutations on a given input
+ *
+ * @param[in] data pointer returned in afl_custom_init for this fuzz case
+ * @param[in] buf Pointer to input data to be mutated
+ * @param[in] buf_size Size of input data
+ * @param[out] out_buf the buffer we will work on. we can reuse *buf. NULL on
+ * error.
+ * @param[in] add_buf Buffer containing the additional test case
+ * @param[in] add_buf_size Size of the additional test case
+ * @param[in] max_size Maximum size of the mutated output. The mutation must not
+ *     produce data larger than max_size.
+ * @return Size of the mutated output.
+ */
+extern "C" size_t afl_custom_fuzz(MyMutator *mutator, // return value from afl_custom_init
+                       uint8_t *buf, size_t buf_size, // input data to be mutated
+                       uint8_t **out_buf, // output buffer
+                       uint8_t *add_buf, size_t add_buf_size,  // add_buf can be NULL
+                       size_t max_size) {
+    // This function can be named either "afl_custom_fuzz" or "afl_custom_mutator"
+    // A simple test shows that "buf" will be the content of the current test case
+    // "add_buf" will be the next test case ( from AFL++'s input queue )
+    
+    TEST input;
+    // parse input data to TEST
+    // Notice that input data should be a serialized protobuf data
+    // Check ./in/ii and test_protobuf_serializer for more detail
+    bool parse_ok = input.ParseFromArray(buf, buf_size);
+    if(!parse_ok) {
+        // Invalid serialize protobuf data. Don't mutate.
+        // Return a dummy buffer. Also mutated_size = 0
+        static uint8_t *dummy = new uint8_t[10]; // dummy buffer with no data
+        *out_buf = dummy;
+        return 0;
+    }
+    // mutate the protobuf
+    mutator->Mutate(&input, max_size);
+    
+    // Convert protobuf to raw data
+    const TEST *p = &input;
+    std::string s = ProtoToData(*p);
+    // Copy to a new buffer ( mutated_out )
+    size_t mutated_size = s.size() <= max_size ? s.size() : max_size; // check if raw data's size is larger than max_size
+    uint8_t *mutated_out = new uint8_t[mutated_size+1];
+    memcpy(mutated_out, s.c_str(), mutated_size); // copy the mutated data
+    // Assign the mutated data and return mutated_size
+    *out_buf = mutated_out;
+    return mutated_size;
+}
+
+/**
+ * Deinitialize everything
+ *
+ * @param data The data ptr from afl_custom_init
+ */
+extern "C" void afl_custom_deinit(void *data) {
+    // Honestly I don't know what to do with this...
+    return;
+}
+
diff --git a/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.h b/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.h
new file mode 100644
index 00000000..ebd3ca65
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/lpm_aflpp_custom_mutator_input.h
@@ -0,0 +1,5 @@
+#include <src/mutator.h>
+#include "test.pb.h"
+
+class MyMutator : public protobuf_mutator::Mutator {
+};
diff --git a/custom_mutators/libprotobuf-mutator-example/test.proto b/custom_mutators/libprotobuf-mutator-example/test.proto
new file mode 100644
index 00000000..e2256c6e
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/test.proto
@@ -0,0 +1,7 @@
+syntax = "proto2";
+
+message TEST {
+  required uint32 a = 1;
+  required string b = 2;
+}
+
diff --git a/custom_mutators/libprotobuf-mutator-example/vuln.c b/custom_mutators/libprotobuf-mutator-example/vuln.c
new file mode 100644
index 00000000..8ffb7080
--- /dev/null
+++ b/custom_mutators/libprotobuf-mutator-example/vuln.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+    char str[100]={};
+    read(0, str, 100);
+    int *ptr = NULL;
+    if( str[0] == '\x02' || str[0] == '\xe8') {
+        *ptr = 123; 
+    }
+    return 0;
+}
+
-- 
cgit 1.4.1


From 89af2ef7a9f1ae1de57a1cdbb7ff2da1de7a943c Mon Sep 17 00:00:00 2001
From: vanhauser-thc <vh@thc.org>
Date: Thu, 18 Feb 2021 11:15:59 +0100
Subject: update honggfuzz custom mutator

---
 custom_mutators/honggfuzz/common.h    |    3 +
 custom_mutators/honggfuzz/honggfuzz.h |    7 +-
 custom_mutators/honggfuzz/mangle.c    | 1174 +++++++++++++++------------------
 3 files changed, 529 insertions(+), 655 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/common.h b/custom_mutators/honggfuzz/common.h
index e69de29b..c8cf1329 100644
--- a/custom_mutators/honggfuzz/common.h
+++ b/custom_mutators/honggfuzz/common.h
@@ -0,0 +1,3 @@
+#ifndef LOG_E
+  #define LOG_E LOG_F
+#endif
diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
index 9d07fdf4..eb6a3f11 100644
--- a/custom_mutators/honggfuzz/honggfuzz.h
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -208,6 +208,7 @@ typedef struct {
         const char* crashDir;
         const char* covDirNew;
         bool        saveUnique;
+        bool        saveSmaller;
         size_t      dynfileqMaxSz;
         size_t      dynfileqCnt;
         dynfile_t*  dynfileqCurrent;
@@ -279,9 +280,9 @@ typedef struct {
         cmpfeedback_t*  cmpFeedbackMap;
         int             cmpFeedbackFd;
         bool            cmpFeedback;
-        const char*     blacklistFile;
-        uint64_t*       blacklist;
-        size_t          blacklistCnt;
+        const char*     blocklistFile;
+        uint64_t*       blocklist;
+        size_t          blocklistCnt;
         bool            skipFeedbackOnTimeout;
         uint64_t        maxCov[4];
         dynFileMethod_t dynFileMethod;
diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index 9c3d1ed4..637d428d 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -39,252 +39,208 @@
 #include "libhfcommon/log.h"
 #include "libhfcommon/util.h"
 
-static inline size_t mangle_LenLeft(run_t *run, size_t off) {
-
-  if (off >= run->dynfile->size) {
-
-    LOG_F("Offset is too large: off:%zu >= len:%zu", off, run->dynfile->size);
-
-  }
-
-  return (run->dynfile->size - off - 1);
-
+static inline size_t mangle_LenLeft(run_t* run, size_t off) {
+    if (off >= run->dynfile->size) {
+        LOG_F("Offset is too large: off:%zu >= len:%zu", off, run->dynfile->size);
+    }
+    return (run->dynfile->size - off - 1);
 }
 
-/* Get a random value <1:max>, but prefer smaller ones - up to 4KiB */
+/*
+ * Get a random value <1:max>, but prefer smaller ones
+ * Based on an idea by https://twitter.com/gamozolabs
+ */
 static inline size_t mangle_getLen(size_t max) {
+    if (max > _HF_INPUT_MAX_SIZE) {
+        LOG_F("max (%zu) > _HF_INPUT_MAX_SIZE (%zu)", max, (size_t)_HF_INPUT_MAX_SIZE);
+    }
+    if (max == 0) {
+        LOG_F("max == 0");
+    }
+    if (max == 1) {
+        return 1;
+    }
 
-  if (max > _HF_INPUT_MAX_SIZE) {
-
-    LOG_F("max (%zu) > _HF_INPUT_MAX_SIZE (%zu)", max,
-          (size_t)_HF_INPUT_MAX_SIZE);
-
-  }
-
-  if (max == 0) { LOG_F("max == 0"); }
-  if (max == 1) { return 1; }
-
-  /* Give 50% chance the the uniform distribution */
-  switch (util_rndGet(0, 9)) {
-
-    case 0:
-      return (size_t)util_rndGet(1, HF_MIN(16, max));
-    case 1:
-      return (size_t)util_rndGet(1, HF_MIN(64, max));
-    case 2:
-      return (size_t)util_rndGet(1, HF_MIN(256, max));
-    case 3:
-      return (size_t)util_rndGet(1, HF_MIN(1024, max));
-    case 4:
-      return (size_t)util_rndGet(1, HF_MIN(4096, max));
-    default:
-      break;
-
-  }
-
-  return (size_t)util_rndGet(1, max);
+    /* Give 50% chance the the uniform distribution */
+    if (util_rnd64() & 1) {
+        return (size_t)util_rndGet(1, max);
+    }
 
+    /* effectively exprand() */
+    return (size_t)util_rndGet(1, util_rndGet(1, max));
 }
 
 /* Prefer smaller values here, so use mangle_getLen() */
-static inline size_t mangle_getOffSet(run_t *run) {
-
-  return mangle_getLen(run->dynfile->size) - 1;
-
+static inline size_t mangle_getOffSet(run_t* run) {
+    return mangle_getLen(run->dynfile->size) - 1;
 }
 
 /* Offset which can be equal to the file size */
-static inline size_t mangle_getOffSetPlus1(run_t *run) {
-
-  size_t reqlen = HF_MIN(run->dynfile->size + 1, _HF_INPUT_MAX_SIZE);
-  return mangle_getLen(reqlen) - 1;
-
+static inline size_t mangle_getOffSetPlus1(run_t* run) {
+    size_t reqlen = HF_MIN(run->dynfile->size + 1, _HF_INPUT_MAX_SIZE);
+    return mangle_getLen(reqlen) - 1;
 }
 
-static inline void mangle_Move(run_t *run, size_t off_from, size_t off_to,
-                               size_t len) {
-
-  if (off_from >= run->dynfile->size) { return; }
-  if (off_to >= run->dynfile->size) { return; }
-  if (off_from == off_to) { return; }
-
-  size_t len_from = run->dynfile->size - off_from;
-  len = HF_MIN(len, len_from);
+static inline void mangle_Move(run_t* run, size_t off_from, size_t off_to, size_t len) {
+    if (off_from >= run->dynfile->size) {
+        return;
+    }
+    if (off_to >= run->dynfile->size) {
+        return;
+    }
+    if (off_from == off_to) {
+        return;
+    }
 
-  size_t len_to = run->dynfile->size - off_to;
-  len = HF_MIN(len, len_to);
+    size_t len_from = run->dynfile->size - off_from;
+    len             = HF_MIN(len, len_from);
 
-  memmove(&run->dynfile->data[off_to], &run->dynfile->data[off_from], len);
+    size_t len_to = run->dynfile->size - off_to;
+    len           = HF_MIN(len, len_to);
 
+    memmove(&run->dynfile->data[off_to], &run->dynfile->data[off_from], len);
 }
 
-static inline void mangle_Overwrite(run_t *run, size_t off, const uint8_t *src,
-                                    size_t len, bool printable) {
-
-  if (len == 0) { return; }
-  size_t maxToCopy = run->dynfile->size - off;
-  if (len > maxToCopy) { len = maxToCopy; }
-
-  memmove(&run->dynfile->data[off], src, len);
-  if (printable) { util_turnToPrintable(&run->dynfile->data[off], len); }
+static inline void mangle_Overwrite(
+    run_t* run, size_t off, const uint8_t* src, size_t len, bool printable) {
+    if (len == 0) {
+        return;
+    }
+    size_t maxToCopy = run->dynfile->size - off;
+    if (len > maxToCopy) {
+        len = maxToCopy;
+    }
 
+    memmove(&run->dynfile->data[off], src, len);
+    if (printable) {
+        util_turnToPrintable(&run->dynfile->data[off], len);
+    }
 }
 
-static inline size_t mangle_Inflate(run_t *run, size_t off, size_t len,
-                                    bool printable) {
-
-  if (run->dynfile->size >= run->global->mutate.maxInputSz) { return 0; }
-  if (len > (run->global->mutate.maxInputSz - run->dynfile->size)) {
-
-    len = run->global->mutate.maxInputSz - run->dynfile->size;
-
-  }
-
-  input_setSize(run, run->dynfile->size + len);
-  mangle_Move(run, off, off + len, run->dynfile->size);
-  if (printable) { memset(&run->dynfile->data[off], ' ', len); }
+static inline size_t mangle_Inflate(run_t* run, size_t off, size_t len, bool printable) {
+    if (run->dynfile->size >= run->global->mutate.maxInputSz) {
+        return 0;
+    }
+    if (len > (run->global->mutate.maxInputSz - run->dynfile->size)) {
+        len = run->global->mutate.maxInputSz - run->dynfile->size;
+    }
 
-  return len;
+    input_setSize(run, run->dynfile->size + len);
+    mangle_Move(run, off, off + len, run->dynfile->size);
+    if (printable) {
+        memset(&run->dynfile->data[off], ' ', len);
+    }
 
+    return len;
 }
 
-static inline void mangle_Insert(run_t *run, size_t off, const uint8_t *val,
-                                 size_t len, bool printable) {
-
-  len = mangle_Inflate(run, off, len, printable);
-  mangle_Overwrite(run, off, val, len, printable);
-
+static inline void mangle_Insert(
+    run_t* run, size_t off, const uint8_t* val, size_t len, bool printable) {
+    len = mangle_Inflate(run, off, len, printable);
+    mangle_Overwrite(run, off, val, len, printable);
 }
 
-static inline void mangle_UseValue(run_t *run, const uint8_t *val, size_t len,
-                                   bool printable) {
-
-  if (util_rnd64() % 2) {
-
-    mangle_Insert(run, mangle_getOffSetPlus1(run), val, len, printable);
-
-  } else {
-
-    mangle_Overwrite(run, mangle_getOffSet(run), val, len, printable);
-
-  }
-
+static inline void mangle_UseValue(run_t* run, const uint8_t* val, size_t len, bool printable) {
+    if (util_rnd64() & 1) {
+        mangle_Overwrite(run, mangle_getOffSet(run), val, len, printable);
+    } else {
+        mangle_Insert(run, mangle_getOffSetPlus1(run), val, len, printable);
+    }
 }
 
-static void mangle_MemSwap(run_t *run, bool printable HF_ATTR_UNUSED) {
-
-  size_t off1 = mangle_getOffSet(run);
-  size_t maxlen1 = run->dynfile->size - off1;
-
-  size_t off2 = mangle_getOffSet(run);
-  size_t maxlen2 = run->dynfile->size - off2;
-
-  size_t   len = mangle_getLen(HF_MIN(maxlen1, maxlen2));
-  uint8_t *tmpbuf = (uint8_t *)util_Malloc(len);
-  defer {
-
-    free(tmpbuf);
-
-  };
-
-  memcpy(tmpbuf, &run->dynfile->data[off1], len);
-  memmove(&run->dynfile->data[off1], &run->dynfile->data[off2], len);
-  memcpy(&run->dynfile->data[off2], tmpbuf, len);
-
+static inline void mangle_UseValueAt(
+    run_t* run, size_t off, const uint8_t* val, size_t len, bool printable) {
+    if (util_rnd64() & 1) {
+        mangle_Overwrite(run, off, val, len, printable);
+    } else {
+        mangle_Insert(run, off, val, len, printable);
+    }
 }
 
-static void mangle_MemCopy(run_t *run, bool printable HF_ATTR_UNUSED) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t len = mangle_getLen(run->dynfile->size - off);
-
-  /* Use a temp buf, as Insert/Inflate can change source bytes */
-  uint8_t *tmpbuf = (uint8_t *)util_Malloc(len);
-  defer {
+static void mangle_MemSwap(run_t* run, bool printable HF_ATTR_UNUSED) {
+    /* No big deal if those two are overlapping */
+    size_t off1    = mangle_getOffSet(run);
+    size_t maxlen1 = run->dynfile->size - off1;
+    size_t off2    = mangle_getOffSet(run);
+    size_t maxlen2 = run->dynfile->size - off2;
+    size_t len     = mangle_getLen(HF_MIN(maxlen1, maxlen2));
 
-    free(tmpbuf);
-
-  };
-
-  memcpy(tmpbuf, &run->dynfile->data[off], len);
-
-  mangle_UseValue(run, tmpbuf, len, printable);
+    if (off1 == off2) {
+        return;
+    }
 
+    for (size_t i = 0; i < (len / 2); i++) {
+        /*
+         * First - from the head, next from the tail. Don't worry about layout of the overlapping
+         * part - there's no good solution to that, and it can be left somewhat scrambled,
+         * while still preserving the entropy
+         */
+        const uint8_t tmp1                       = run->dynfile->data[off2 + i];
+        run->dynfile->data[off2 + i]             = run->dynfile->data[off1 + i];
+        run->dynfile->data[off1 + i]             = tmp1;
+        const uint8_t tmp2                       = run->dynfile->data[off2 + (len - 1) - i];
+        run->dynfile->data[off2 + (len - 1) - i] = run->dynfile->data[off1 + (len - 1) - i];
+        run->dynfile->data[off1 + (len - 1) - i] = tmp2;
+    }
 }
 
-static void mangle_Bytes(run_t *run, bool printable) {
-
-  uint16_t buf;
-  if (printable) {
-
-    util_rndBufPrintable((uint8_t *)&buf, sizeof(buf));
-
-  } else {
+static void mangle_MemCopy(run_t* run, bool printable HF_ATTR_UNUSED) {
+    size_t off = mangle_getOffSet(run);
+    size_t len = mangle_getLen(run->dynfile->size - off);
 
-    buf = util_rnd64();
-
-  }
-
-  /* Overwrite with random 1-2-byte values */
-  size_t toCopy = util_rndGet(1, 2);
-  mangle_UseValue(run, (const uint8_t *)&buf, toCopy, printable);
+    /* Use a temp buf, as Insert/Inflate can change source bytes */
+    uint8_t* tmpbuf = (uint8_t*)util_Malloc(len);
+    defer {
+        free(tmpbuf);
+    };
+    memmove(tmpbuf, &run->dynfile->data[off], len);
 
+    mangle_UseValue(run, tmpbuf, len, printable);
 }
 
-static void mangle_ByteRepeatOverwrite(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t destOff = off + 1;
-  size_t maxSz = run->dynfile->size - destOff;
-
-  /* No space to repeat */
-  if (!maxSz) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  size_t len = mangle_getLen(maxSz);
-  memset(&run->dynfile->data[destOff], run->dynfile->data[off], len);
+static void mangle_Bytes(run_t* run, bool printable) {
+    uint16_t buf;
+    if (printable) {
+        util_rndBufPrintable((uint8_t*)&buf, sizeof(buf));
+    } else {
+        buf = util_rnd64();
+    }
 
+    /* Overwrite with random 1-2-byte values */
+    size_t toCopy = util_rndGet(1, 2);
+    mangle_UseValue(run, (const uint8_t*)&buf, toCopy, printable);
 }
 
-static void mangle_ByteRepeatInsert(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t destOff = off + 1;
-  size_t maxSz = run->dynfile->size - destOff;
+static void mangle_ByteRepeat(run_t* run, bool printable) {
+    size_t off     = mangle_getOffSet(run);
+    size_t destOff = off + 1;
+    size_t maxSz   = run->dynfile->size - destOff;
 
-  /* No space to repeat */
-  if (!maxSz) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  size_t len = mangle_getLen(maxSz);
-  len = mangle_Inflate(run, destOff, len, printable);
-  memset(&run->dynfile->data[destOff], run->dynfile->data[off], len);
+    /* No space to repeat */
+    if (!maxSz) {
+        mangle_Bytes(run, printable);
+        return;
+    }
 
+    size_t len = mangle_getLen(maxSz);
+    if (util_rnd64() & 0x1) {
+        len = mangle_Inflate(run, destOff, len, printable);
+    }
+    memset(&run->dynfile->data[destOff], run->dynfile->data[off], len);
 }
 
-static void mangle_Bit(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  run->dynfile->data[off] ^= (uint8_t)(1U << util_rndGet(0, 7));
-  if (printable) { util_turnToPrintable(&(run->dynfile->data[off]), 1); }
-
+static void mangle_Bit(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    run->dynfile->data[off] ^= (uint8_t)(1U << util_rndGet(0, 7));
+    if (printable) {
+        util_turnToPrintable(&(run->dynfile->data[off]), 1);
+    }
 }
 
 static const struct {
-
-  const uint8_t val[8];
-  const size_t  size;
-
+    const uint8_t val[8];
+    const size_t  size;
 } mangleMagicVals[] = {
-
     /* 1B - No endianness */
     {"\x00\x00\x00\x00\x00\x00\x00\x00", 1},
     {"\x01\x00\x00\x00\x00\x00\x00\x00", 1},
@@ -516,522 +472,436 @@ static const struct {
     {"\x00\x00\x00\x00\x00\x00\x00\x80", 8},
     {"\x01\x00\x00\x00\x00\x00\x00\x80", 8},
     {"\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8},
-
 };
 
-static void mangle_Magic(run_t *run, bool printable) {
-
-  uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleMagicVals) - 1);
-  mangle_UseValue(run, mangleMagicVals[choice].val,
-                  mangleMagicVals[choice].size, printable);
-
-}
-
-static void mangle_StaticDict(run_t *run, bool printable) {
-
-  if (run->global->mutate.dictionaryCnt == 0) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  uint64_t choice = util_rndGet(0, run->global->mutate.dictionaryCnt - 1);
-  mangle_UseValue(run, run->global->mutate.dictionary[choice].val,
-                  run->global->mutate.dictionary[choice].len, printable);
-
+static void mangle_Magic(run_t* run, bool printable) {
+    uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleMagicVals) - 1);
+    mangle_UseValue(run, mangleMagicVals[choice].val, mangleMagicVals[choice].size, printable);
 }
 
-static inline const uint8_t *mangle_FeedbackDict(run_t *run, size_t *len) {
-
-  if (!run->global->feedback.cmpFeedback) { return NULL; }
-  cmpfeedback_t *cmpf = run->global->feedback.cmpFeedbackMap;
-  uint32_t       cnt = ATOMIC_GET(cmpf->cnt);
-  if (cnt == 0) { return NULL; }
-  if (cnt > ARRAYSIZE(cmpf->valArr)) { cnt = ARRAYSIZE(cmpf->valArr); }
-  uint32_t choice = util_rndGet(0, cnt - 1);
-  *len = (size_t)ATOMIC_GET(cmpf->valArr[choice].len);
-  if (*len == 0) { return NULL; }
-  return cmpf->valArr[choice].val;
-
+static void mangle_StaticDict(run_t* run, bool printable) {
+    if (run->global->mutate.dictionaryCnt == 0) {
+        mangle_Bytes(run, printable);
+        return;
+    }
+    uint64_t choice = util_rndGet(0, run->global->mutate.dictionaryCnt - 1);
+    mangle_UseValue(run, run->global->mutate.dictionary[choice].val,
+        run->global->mutate.dictionary[choice].len, printable);
 }
 
-static void mangle_ConstFeedbackDict(run_t *run, bool printable) {
-
-  size_t         len;
-  const uint8_t *val = mangle_FeedbackDict(run, &len);
-  if (val == NULL) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  mangle_UseValue(run, val, len, printable);
-
+static inline const uint8_t* mangle_FeedbackDict(run_t* run, size_t* len) {
+    if (!run->global->feedback.cmpFeedback) {
+        return NULL;
+    }
+    cmpfeedback_t* cmpf = run->global->feedback.cmpFeedbackMap;
+    uint32_t       cnt  = ATOMIC_GET(cmpf->cnt);
+    if (cnt == 0) {
+        return NULL;
+    }
+    if (cnt > ARRAYSIZE(cmpf->valArr)) {
+        cnt = ARRAYSIZE(cmpf->valArr);
+    }
+    uint32_t choice = util_rndGet(0, cnt - 1);
+    *len            = (size_t)ATOMIC_GET(cmpf->valArr[choice].len);
+    if (*len == 0) {
+        return NULL;
+    }
+    return cmpf->valArr[choice].val;
 }
 
-static void mangle_MemSet(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t len = mangle_getLen(run->dynfile->size - off);
-  int    val =
-      printable ? (int)util_rndPrintable() : (int)util_rndGet(0, UINT8_MAX);
-
-  memset(&run->dynfile->data[off], val, len);
-
+static void mangle_ConstFeedbackDict(run_t* run, bool printable) {
+    size_t         len;
+    const uint8_t* val = mangle_FeedbackDict(run, &len);
+    if (val == NULL) {
+        mangle_Bytes(run, printable);
+        return;
+    }
+    mangle_UseValue(run, val, len, printable);
 }
 
-static void mangle_RandomOverwrite(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t len = mangle_getLen(run->dynfile->size - off);
-  if (printable) {
-
-    util_rndBufPrintable(&run->dynfile->data[off], len);
-
-  } else {
-
-    util_rndBuf(&run->dynfile->data[off], len);
+static void mangle_MemSet(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    size_t len = mangle_getLen(run->dynfile->size - off);
+    int    val = printable ? (int)util_rndPrintable() : (int)util_rndGet(0, UINT8_MAX);
 
-  }
+    if (util_rnd64() & 1) {
+        len = mangle_Inflate(run, off, len, printable);
+    }
 
+    memset(&run->dynfile->data[off], val, len);
 }
 
-static void mangle_RandomInsert(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t len = mangle_getLen(run->dynfile->size - off);
-
-  len = mangle_Inflate(run, off, len, printable);
-
-  if (printable) {
+static void mangle_MemClr(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    size_t len = mangle_getLen(run->dynfile->size - off);
+    int    val = printable ? ' ' : 0;
 
-    util_rndBufPrintable(&run->dynfile->data[off], len);
-
-  } else {
-
-    util_rndBuf(&run->dynfile->data[off], len);
-
-  }
+    if (util_rnd64() & 1) {
+        len = mangle_Inflate(run, off, len, printable);
+    }
 
+    memset(&run->dynfile->data[off], val, len);
 }
 
-static inline void mangle_AddSubWithRange(run_t *run, size_t off, size_t varLen,
-                                          uint64_t range, bool printable) {
-
-  int64_t delta = (int64_t)util_rndGet(0, range * 2) - (int64_t)range;
-
-  switch (varLen) {
-
-    case 1: {
-
-      run->dynfile->data[off] += delta;
-      break;
+static void mangle_RandomBuf(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    size_t len = mangle_getLen(run->dynfile->size - off);
 
+    if (util_rnd64() & 1) {
+        len = mangle_Inflate(run, off, len, printable);
     }
 
-    case 2: {
-
-      int16_t val;
-      memcpy(&val, &run->dynfile->data[off], sizeof(val));
-      if (util_rnd64() & 0x1) {
-
-        val += delta;
-
-      } else {
-
-        /* Foreign endianess */
-        val = __builtin_bswap16(val);
-        val += delta;
-        val = __builtin_bswap16(val);
-
-      }
-
-      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
-      break;
-
+    if (printable) {
+        util_rndBufPrintable(&run->dynfile->data[off], len);
+    } else {
+        util_rndBuf(&run->dynfile->data[off], len);
     }
+}
 
-    case 4: {
-
-      int32_t val;
-      memcpy(&val, &run->dynfile->data[off], sizeof(val));
-      if (util_rnd64() & 0x1) {
-
-        val += delta;
-
-      } else {
-
-        /* Foreign endianess */
-        val = __builtin_bswap32(val);
-        val += delta;
-        val = __builtin_bswap32(val);
-
-      }
-
-      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
-      break;
-
+static inline void mangle_AddSubWithRange(
+    run_t* run, size_t off, size_t varLen, uint64_t range, bool printable) {
+    int64_t delta = (int64_t)util_rndGet(0, range * 2) - (int64_t)range;
+
+    switch (varLen) {
+        case 1: {
+            run->dynfile->data[off] += delta;
+            break;
+        }
+        case 2: {
+            int16_t val;
+            memcpy(&val, &run->dynfile->data[off], sizeof(val));
+            if (util_rnd64() & 0x1) {
+                val += delta;
+            } else {
+                /* Foreign endianess */
+                val = __builtin_bswap16(val);
+                val += delta;
+                val = __builtin_bswap16(val);
+            }
+            mangle_Overwrite(run, off, (uint8_t*)&val, varLen, printable);
+            break;
+        }
+        case 4: {
+            int32_t val;
+            memcpy(&val, &run->dynfile->data[off], sizeof(val));
+            if (util_rnd64() & 0x1) {
+                val += delta;
+            } else {
+                /* Foreign endianess */
+                val = __builtin_bswap32(val);
+                val += delta;
+                val = __builtin_bswap32(val);
+            }
+            mangle_Overwrite(run, off, (uint8_t*)&val, varLen, printable);
+            break;
+        }
+        case 8: {
+            int64_t val;
+            memcpy(&val, &run->dynfile->data[off], sizeof(val));
+            if (util_rnd64() & 0x1) {
+                val += delta;
+            } else {
+                /* Foreign endianess */
+                val = __builtin_bswap64(val);
+                val += delta;
+                val = __builtin_bswap64(val);
+            }
+            mangle_Overwrite(run, off, (uint8_t*)&val, varLen, printable);
+            break;
+        }
+        default: {
+            LOG_F("Unknown variable length size: %zu", varLen);
+        }
     }
+}
 
-    case 8: {
-
-      int64_t val;
-      memcpy(&val, &run->dynfile->data[off], sizeof(val));
-      if (util_rnd64() & 0x1) {
-
-        val += delta;
-
-      } else {
-
-        /* Foreign endianess */
-        val = __builtin_bswap64(val);
-        val += delta;
-        val = __builtin_bswap64(val);
-
-      }
-
-      mangle_Overwrite(run, off, (uint8_t *)&val, varLen, printable);
-      break;
+static void mangle_AddSub(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
 
+    /* 1,2,4,8 */
+    size_t varLen = 1U << util_rndGet(0, 3);
+    if ((run->dynfile->size - off) < varLen) {
+        varLen = 1;
     }
 
-    default: {
-
-      LOG_F("Unknown variable length size: %zu", varLen);
-
+    uint64_t range;
+    switch (varLen) {
+        case 1:
+            range = 16;
+            break;
+        case 2:
+            range = 4096;
+            break;
+        case 4:
+            range = 1048576;
+            break;
+        case 8:
+            range = 268435456;
+            break;
+        default:
+            LOG_F("Invalid operand size: %zu", varLen);
     }
 
-  }
-
-}
-
-static void mangle_AddSub(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-
-  /* 1,2,4,8 */
-  size_t varLen = 1U << util_rndGet(0, 3);
-  if ((run->dynfile->size - off) < varLen) { varLen = 1; }
-
-  uint64_t range;
-  switch (varLen) {
-
-    case 1:
-      range = 16;
-      break;
-    case 2:
-      range = 4096;
-      break;
-    case 4:
-      range = 1048576;
-      break;
-    case 8:
-      range = 268435456;
-      break;
-    default:
-      LOG_F("Invalid operand size: %zu", varLen);
-
-  }
-
-  mangle_AddSubWithRange(run, off, varLen, range, printable);
-
-}
-
-static void mangle_IncByte(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  if (printable) {
-
-    run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 1) % 95 + 32;
-
-  } else {
-
-    run->dynfile->data[off] += (uint8_t)1UL;
-
-  }
-
+    mangle_AddSubWithRange(run, off, varLen, range, printable);
 }
 
-static void mangle_DecByte(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  if (printable) {
-
-    run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 94) % 95 + 32;
-
-  } else {
-
-    run->dynfile->data[off] -= (uint8_t)1UL;
-
-  }
-
-}
-
-static void mangle_NegByte(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  if (printable) {
-
-    run->dynfile->data[off] = 94 - (run->dynfile->data[off] - 32) + 32;
-
-  } else {
-
-    run->dynfile->data[off] = ~(run->dynfile->data[off]);
-
-  }
-
+static void mangle_IncByte(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    if (printable) {
+        run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 1) % 95 + 32;
+    } else {
+        run->dynfile->data[off] += (uint8_t)1UL;
+    }
 }
 
-static void mangle_Expand(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-  size_t len;
-  if (util_rnd64() % 16) {
-
-    len = mangle_getLen(HF_MIN(16, run->global->mutate.maxInputSz - off));
-
-  } else {
-
-    len = mangle_getLen(run->global->mutate.maxInputSz - off);
-
-  }
-
-  mangle_Inflate(run, off, len, printable);
-
+static void mangle_DecByte(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    if (printable) {
+        run->dynfile->data[off] = (run->dynfile->data[off] - 32 + 94) % 95 + 32;
+    } else {
+        run->dynfile->data[off] -= (uint8_t)1UL;
+    }
 }
 
-static void mangle_Shrink(run_t *run, bool printable HF_ATTR_UNUSED) {
-
-  if (run->dynfile->size <= 2U) { return; }
-
-  size_t off_start = mangle_getOffSet(run);
-  size_t len = mangle_LenLeft(run, off_start);
-  if (len == 0) { return; }
-  if (util_rnd64() % 16) {
-
-    len = mangle_getLen(HF_MIN(16, len));
-
-  } else {
-
-    len = mangle_getLen(len);
-
-  }
-
-  size_t off_end = off_start + len;
-  size_t len_to_move = run->dynfile->size - off_end;
-
-  mangle_Move(run, off_end, off_start, len_to_move);
-  input_setSize(run, run->dynfile->size - len);
-
+static void mangle_NegByte(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    if (printable) {
+        run->dynfile->data[off] = 94 - (run->dynfile->data[off] - 32) + 32;
+    } else {
+        run->dynfile->data[off] = ~(run->dynfile->data[off]);
+    }
 }
 
-static void mangle_ASCIINum(run_t *run, bool printable) {
-
-  size_t len = util_rndGet(2, 8);
-
-  char buf[20];
-  snprintf(buf, sizeof(buf), "%-19" PRId64, (int64_t)util_rnd64());
-
-  mangle_UseValue(run, (const uint8_t *)buf, len, printable);
+static void mangle_Expand(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
+    size_t len;
+    if (util_rnd64() % 16) {
+        len = mangle_getLen(HF_MIN(16, run->global->mutate.maxInputSz - off));
+    } else {
+        len = mangle_getLen(run->global->mutate.maxInputSz - off);
+    }
 
+    mangle_Inflate(run, off, len, printable);
 }
 
-static void mangle_ASCIINumChange(run_t *run, bool printable) {
-
-  size_t off = mangle_getOffSet(run);
-
-  /* Find a digit */
-  for (; off < run->dynfile->size; off++) {
-
-    if (isdigit(run->dynfile->data[off])) { break; }
-
-  }
-
-  if (off == run->dynfile->size) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  size_t len = HF_MIN(20, run->dynfile->size - off);
-  char   numbuf[21] = {};
-  strncpy(numbuf, (const char *)&run->dynfile->data[off], len);
-  uint64_t val = (uint64_t)strtoull(numbuf, NULL, 10);
-
-  switch (util_rndGet(0, 5)) {
-
-    case 0:
-      val += util_rndGet(1, 256);
-      break;
-    case 1:
-      val -= util_rndGet(1, 256);
-      break;
-    case 2:
-      val *= util_rndGet(1, 256);
-      break;
-    case 3:
-      val /= util_rndGet(1, 256);
-      break;
-    case 4:
-      val = ~(val);
-      break;
-    case 5:
-      val = util_rnd64();
-      break;
-    default:
-      LOG_F("Invalid choice");
-
-  };
+static void mangle_Shrink(run_t* run, bool printable HF_ATTR_UNUSED) {
+    if (run->dynfile->size <= 2U) {
+        return;
+    }
 
-  len = HF_MIN((size_t)snprintf(numbuf, sizeof(numbuf), "%" PRIu64, val), len);
-  mangle_Overwrite(run, off, (const uint8_t *)numbuf, len, printable);
+    size_t off_start = mangle_getOffSet(run);
+    size_t len       = mangle_LenLeft(run, off_start);
+    if (len == 0) {
+        return;
+    }
+    if (util_rnd64() % 16) {
+        len = mangle_getLen(HF_MIN(16, len));
+    } else {
+        len = mangle_getLen(len);
+    }
+    size_t off_end     = off_start + len;
+    size_t len_to_move = run->dynfile->size - off_end;
 
+    mangle_Move(run, off_end, off_start, len_to_move);
+    input_setSize(run, run->dynfile->size - len);
 }
+static void mangle_ASCIINum(run_t* run, bool printable) {
+    size_t len = util_rndGet(2, 8);
 
-static void mangle_Splice(run_t *run, bool printable) {
-
-  const uint8_t *buf;
-  size_t         sz = input_getRandomInputAsBuf(run, &buf);
-  if (!sz) {
-
-    mangle_Bytes(run, printable);
-    return;
-
-  }
-
-  size_t remoteOff = mangle_getLen(sz) - 1;
-  size_t len = mangle_getLen(sz - remoteOff);
-  mangle_UseValue(run, &buf[remoteOff], len, printable);
+    char buf[20];
+    snprintf(buf, sizeof(buf), "%-19" PRId64, (int64_t)util_rnd64());
 
+    mangle_UseValue(run, (const uint8_t*)buf, len, printable);
 }
 
-static void mangle_Resize(run_t *run, bool printable) {
-
-  ssize_t oldsz = run->dynfile->size;
-  ssize_t newsz = 0;
-
-  uint64_t choice = util_rndGet(0, 32);
-  switch (choice) {
+static void mangle_ASCIINumChange(run_t* run, bool printable) {
+    size_t off = mangle_getOffSet(run);
 
-    case 0:                                     /* Set new size arbitrarily */
-      newsz = (ssize_t)util_rndGet(1, run->global->mutate.maxInputSz);
-      break;
-    case 1 ... 4:                         /* Increase size by a small value */
-      newsz = oldsz + (ssize_t)util_rndGet(0, 8);
-      break;
-    case 5:                              /* Increase size by a larger value */
-      newsz = oldsz + (ssize_t)util_rndGet(9, 128);
-      break;
-    case 6 ... 9:                         /* Decrease size by a small value */
-      newsz = oldsz - (ssize_t)util_rndGet(0, 8);
-      break;
-    case 10:                             /* Decrease size by a larger value */
-      newsz = oldsz - (ssize_t)util_rndGet(9, 128);
-      break;
-    case 11 ... 32:                                           /* Do nothing */
-      newsz = oldsz;
-      break;
-    default:
-      LOG_F("Illegal value from util_rndGet: %" PRIu64, choice);
-      break;
-
-  }
-
-  if (newsz < 1) { newsz = 1; }
-  if (newsz > (ssize_t)run->global->mutate.maxInputSz) {
-
-    newsz = run->global->mutate.maxInputSz;
+    /* Find a digit */
+    for (; off < run->dynfile->size; off++) {
+        if (isdigit(run->dynfile->data[off])) {
+            break;
+        }
+    }
+    size_t left = run->dynfile->size - off;
+    if (left == 0) {
+        return;
+    }
 
-  }
+    size_t   len = 0;
+    uint64_t val = 0;
+    /* 20 is maximum lenght of a string representing a 64-bit unsigned value */
+    for (len = 0; (len < 20) && (len < left); len++) {
+        char c = run->dynfile->data[off + len];
+        if (!isdigit(c)) {
+            break;
+        }
+        val *= 10;
+        val += (c - '0');
+    }
 
-  input_setSize(run, (size_t)newsz);
-  if (newsz > oldsz) {
+    switch (util_rndGet(0, 7)) {
+        case 0:
+            val++;
+            break;
+        case 1:
+            val--;
+            break;
+        case 2:
+            val *= 2;
+            break;
+        case 3:
+            val /= 2;
+            break;
+        case 4:
+            val = util_rnd64();
+            break;
+        case 5:
+            val += util_rndGet(1, 256);
+            break;
+        case 6:
+            val -= util_rndGet(1, 256);
+            break;
+        case 7:
+            val = ~(val);
+            break;
+        default:
+            LOG_F("Invalid choice");
+    };
+
+    char buf[20];
+    snprintf(buf, sizeof(buf), "%-19" PRIu64, val);
+
+    mangle_UseValueAt(run, off, (const uint8_t*)buf, len, printable);
+}
+
+static void mangle_Splice(run_t* run, bool printable) {
+    if (run->global->feedback.dynFileMethod == _HF_DYNFILE_NONE) {
+        mangle_Bytes(run, printable);
+        return;
+    }
 
-    if (printable) { memset(&run->dynfile->data[oldsz], ' ', newsz - oldsz); }
+    size_t         sz  = 0;
+    const uint8_t* buf = input_getRandomInputAsBuf(run, &sz);
+    if (!buf) {
+        LOG_E("input_getRandomInputAsBuf() returned no input");
+        mangle_Bytes(run, printable);
+        return;
+    }
+    if (!sz) {
+        mangle_Bytes(run, printable);
+        return;
+    }
 
-  }
+    size_t remoteOff = mangle_getLen(sz) - 1;
+    size_t len       = mangle_getLen(sz - remoteOff);
+    mangle_UseValue(run, &buf[remoteOff], len, printable);
+}
+
+static void mangle_Resize(run_t* run, bool printable) {
+    ssize_t oldsz = run->dynfile->size;
+    ssize_t newsz = 0;
+
+    uint64_t choice = util_rndGet(0, 32);
+    switch (choice) {
+        case 0: /* Set new size arbitrarily */
+            newsz = (ssize_t)util_rndGet(1, run->global->mutate.maxInputSz);
+            break;
+        case 1 ... 4: /* Increase size by a small value */
+            newsz = oldsz + (ssize_t)util_rndGet(0, 8);
+            break;
+        case 5: /* Increase size by a larger value */
+            newsz = oldsz + (ssize_t)util_rndGet(9, 128);
+            break;
+        case 6 ... 9: /* Decrease size by a small value */
+            newsz = oldsz - (ssize_t)util_rndGet(0, 8);
+            break;
+        case 10: /* Decrease size by a larger value */
+            newsz = oldsz - (ssize_t)util_rndGet(9, 128);
+            break;
+        case 11 ... 32: /* Do nothing */
+            newsz = oldsz;
+            break;
+        default:
+            LOG_F("Illegal value from util_rndGet: %" PRIu64, choice);
+            break;
+    }
+    if (newsz < 1) {
+        newsz = 1;
+    }
+    if (newsz > (ssize_t)run->global->mutate.maxInputSz) {
+        newsz = run->global->mutate.maxInputSz;
+    }
 
+    input_setSize(run, (size_t)newsz);
+    if (newsz > oldsz) {
+        if (printable) {
+            memset(&run->dynfile->data[oldsz], ' ', newsz - oldsz);
+        }
+    }
 }
 
-void mangle_mangleContent(run_t *run, int speed_factor) {
-
-  static void (*const mangleFuncs[])(run_t * run, bool printable) = {
-
-      /* Every *Insert or Expand expands file, so add more Shrink's */
-      mangle_Shrink,
-      mangle_Shrink,
-      mangle_Shrink,
-      mangle_Shrink,
-      mangle_Expand,
-      mangle_Bit,
-      mangle_IncByte,
-      mangle_DecByte,
-      mangle_NegByte,
-      mangle_AddSub,
-      mangle_MemSet,
-      mangle_MemSwap,
-      mangle_MemCopy,
-      mangle_Bytes,
-      mangle_ASCIINum,
-      mangle_ASCIINumChange,
-      mangle_ByteRepeatOverwrite,
-      mangle_ByteRepeatInsert,
-      mangle_Magic,
-      mangle_StaticDict,
-      mangle_ConstFeedbackDict,
-      mangle_RandomOverwrite,
-      mangle_RandomInsert,
-      mangle_Splice,
-
-  };
-
-  if (run->mutationsPerRun == 0U) { return; }
-  if (run->dynfile->size == 0U) {
-
-    mangle_Resize(run, /* printable= */ run->global->cfg.only_printable);
-
-  }
-
-  uint64_t changesCnt;
-
-  if (speed_factor < 5) {
-
-    changesCnt = util_rndGet(1, run->global->mutate.mutationsPerRun);
-
-  } else if (speed_factor < 10) {
-
-    changesCnt = run->global->mutate.mutationsPerRun;
-
-  } else {
-
-    changesCnt = HF_MIN(speed_factor, 12);
-    changesCnt = HF_MAX(changesCnt, run->global->mutate.mutationsPerRun);
-
-  }
-
-  /* If last coverage acquisition was more than 5 secs ago, use splicing more
-   * frequently */
-  if ((time(NULL) - ATOMIC_GET(run->global->timing.lastCovUpdate)) > 5) {
-
-    if (util_rnd64() % 2) {
-
-      mangle_Splice(run, run->global->cfg.only_printable);
-
+void mangle_mangleContent(run_t* run, int speed_factor) {
+    static void (*const mangleFuncs[])(run_t * run, bool printable) = {
+        mangle_Shrink,
+        mangle_Expand,
+        mangle_Bit,
+        mangle_IncByte,
+        mangle_DecByte,
+        mangle_NegByte,
+        mangle_AddSub,
+        mangle_MemSet,
+        mangle_MemClr,
+        mangle_MemSwap,
+        mangle_MemCopy,
+        mangle_Bytes,
+        mangle_ASCIINum,
+        mangle_ASCIINumChange,
+        mangle_ByteRepeat,
+        mangle_Magic,
+        mangle_StaticDict,
+        mangle_ConstFeedbackDict,
+        mangle_RandomBuf,
+        mangle_Splice,
+    };
+
+    if (run->mutationsPerRun == 0U) {
+        return;
+    }
+    if (run->dynfile->size == 0U) {
+        mangle_Resize(run, /* printable= */ run->global->cfg.only_printable);
     }
 
-  }
-
-  for (uint64_t x = 0; x < changesCnt; x++) {
+    uint64_t changesCnt = run->global->mutate.mutationsPerRun;
 
-    uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleFuncs) - 1);
-    mangleFuncs[choice](run, /* printable= */ run->global->cfg.only_printable);
+    if (speed_factor < 5) {
+        changesCnt = util_rndGet(1, run->global->mutate.mutationsPerRun);
+    } else if (speed_factor < 10) {
+        changesCnt = run->global->mutate.mutationsPerRun;
+    } else {
+        changesCnt = HF_MIN(speed_factor, 10);
+        changesCnt = HF_MAX(changesCnt, (run->global->mutate.mutationsPerRun * 5));
+    }
 
-  }
+    /* If last coverage acquisition was more than 5 secs ago, use splicing more frequently */
+    if ((time(NULL) - ATOMIC_GET(run->global->timing.lastCovUpdate)) > 5) {
+        if (util_rnd64() & 0x1) {
+            mangle_Splice(run, run->global->cfg.only_printable);
+        }
+    }
 
-  wmb();
+    for (uint64_t x = 0; x < changesCnt; x++) {
+        if (run->global->feedback.cmpFeedback && (util_rnd64() & 0x1)) {
+            /*
+             * mangle_ConstFeedbackDict() is quite powerful if the dynamic feedback dictionary
+             * exists. If so, give it 50% chance of being used among all mangling functions.
+             */
+            mangle_ConstFeedbackDict(run, /* printable= */ run->global->cfg.only_printable);
+        } else {
+            uint64_t choice = util_rndGet(0, ARRAYSIZE(mangleFuncs) - 1);
+            mangleFuncs[choice](run, /* printable= */ run->global->cfg.only_printable);
+        }
+    }
 
+    wmb();
 }
-
-- 
cgit 1.4.1


From aaf5fcd98a7c713ab8b6ae554babbf74bd92374b Mon Sep 17 00:00:00 2001
From: Corey Farwell <coreyf@rwell.org>
Date: Fri, 19 Feb 2021 09:18:59 -0500
Subject: Remove self-referential symlink

---
 custom_mutators/honggfuzz/honggfuzz.h | 2 +-
 custom_mutators/honggfuzz/libhfcommon | 1 -
 custom_mutators/honggfuzz/mangle.c    | 6 +++---
 3 files changed, 4 insertions(+), 5 deletions(-)
 delete mode 120000 custom_mutators/honggfuzz/libhfcommon

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
index 9d07fdf4..88f5e47c 100644
--- a/custom_mutators/honggfuzz/honggfuzz.h
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -36,7 +36,7 @@
 #include <sys/types.h>
 #include <time.h>
 
-#include "libhfcommon/util.h"
+#include "util.h"
 
 #define PROG_NAME    "honggfuzz"
 #define PROG_VERSION "2.3"
diff --git a/custom_mutators/honggfuzz/libhfcommon b/custom_mutators/honggfuzz/libhfcommon
deleted file mode 120000
index 945c9b46..00000000
--- a/custom_mutators/honggfuzz/libhfcommon
+++ /dev/null
@@ -1 +0,0 @@
-.
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index 9c3d1ed4..91d885a1 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -35,9 +35,9 @@
 #include <time.h>
 
 #include "input.h"
-#include "libhfcommon/common.h"
-#include "libhfcommon/log.h"
-#include "libhfcommon/util.h"
+#include "common.h"
+#include "log.h"
+#include "util.h"
 
 static inline size_t mangle_LenLeft(run_t *run, size_t off) {
 
-- 
cgit 1.4.1


From 4290cb587763b334c7fb1213bc50dada8d62765d Mon Sep 17 00:00:00 2001
From: Andrea Fioraldi <andreafioraldi@gmail.com>
Date: Fri, 19 Feb 2021 16:07:47 +0100
Subject: fix hongg mutator API change

---
 custom_mutators/honggfuzz/input.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/input.h b/custom_mutators/honggfuzz/input.h
index 7b0c55ae..09712f54 100644
--- a/custom_mutators/honggfuzz/input.h
+++ b/custom_mutators/honggfuzz/input.h
@@ -77,11 +77,11 @@ static inline uint64_t util_rndGet(uint64_t min, uint64_t max) {
 }
 static inline uint64_t util_rnd64() { return rand_below(afl_struct, 1 << 30); }
 
-static inline size_t input_getRandomInputAsBuf(run_t *run, const uint8_t **buf) {
-  *buf = queue_input;
+static inline const uint8_t* input_getRandomInputAsBuf(run_t* run, size_t* len) {
+  *len = queue_input_size;
   run->dynfile->data = queue_input;
   run->dynfile->size = queue_input_size;
-  return queue_input_size;
+  return queue_input;
 }
 static inline void input_setSize(run_t* run, size_t sz) {
   run->dynfile->size = sz;
-- 
cgit 1.4.1


From 6998489b26fc87461e1036903ffa7e6496e2b2e9 Mon Sep 17 00:00:00 2001
From: Andrea Fioraldi <andreafioraldi@gmail.com>
Date: Fri, 19 Feb 2021 18:21:10 +0100
Subject: Revert "Remove self-referential symlink"

This reverts commit aaf5fcd98a7c713ab8b6ae554babbf74bd92374b.
---
 custom_mutators/honggfuzz/honggfuzz.h | 2 +-
 custom_mutators/honggfuzz/libhfcommon | 1 +
 custom_mutators/honggfuzz/mangle.c    | 6 +++---
 3 files changed, 5 insertions(+), 4 deletions(-)
 create mode 120000 custom_mutators/honggfuzz/libhfcommon

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
index 62c30f2f..eb6a3f11 100644
--- a/custom_mutators/honggfuzz/honggfuzz.h
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -36,7 +36,7 @@
 #include <sys/types.h>
 #include <time.h>
 
-#include "util.h"
+#include "libhfcommon/util.h"
 
 #define PROG_NAME    "honggfuzz"
 #define PROG_VERSION "2.3"
diff --git a/custom_mutators/honggfuzz/libhfcommon b/custom_mutators/honggfuzz/libhfcommon
new file mode 120000
index 00000000..945c9b46
--- /dev/null
+++ b/custom_mutators/honggfuzz/libhfcommon
@@ -0,0 +1 @@
+.
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/mangle.c b/custom_mutators/honggfuzz/mangle.c
index db339305..637d428d 100644
--- a/custom_mutators/honggfuzz/mangle.c
+++ b/custom_mutators/honggfuzz/mangle.c
@@ -35,9 +35,9 @@
 #include <time.h>
 
 #include "input.h"
-#include "common.h"
-#include "log.h"
-#include "util.h"
+#include "libhfcommon/common.h"
+#include "libhfcommon/log.h"
+#include "libhfcommon/util.h"
 
 static inline size_t mangle_LenLeft(run_t* run, size_t off) {
     if (off >= run->dynfile->size) {
-- 
cgit 1.4.1


From 17211253b2298958dfbd9dae79acf96a4d9ca32d Mon Sep 17 00:00:00 2001
From: Andrea Fioraldi <andreafioraldi@gmail.com>
Date: Fri, 19 Feb 2021 18:25:24 +0100
Subject: libhfcommon not anymore a symlink

---
 custom_mutators/honggfuzz/common.h             | 3 ---
 custom_mutators/honggfuzz/libhfcommon          | 1 -
 custom_mutators/honggfuzz/libhfcommon/common.h | 3 +++
 custom_mutators/honggfuzz/libhfcommon/log.h    | 1 +
 custom_mutators/honggfuzz/libhfcommon/util.h   | 1 +
 custom_mutators/honggfuzz/log.h                | 1 -
 custom_mutators/honggfuzz/util.h               | 1 -
 7 files changed, 5 insertions(+), 6 deletions(-)
 delete mode 100644 custom_mutators/honggfuzz/common.h
 delete mode 120000 custom_mutators/honggfuzz/libhfcommon
 create mode 100644 custom_mutators/honggfuzz/libhfcommon/common.h
 create mode 120000 custom_mutators/honggfuzz/libhfcommon/log.h
 create mode 120000 custom_mutators/honggfuzz/libhfcommon/util.h
 delete mode 120000 custom_mutators/honggfuzz/log.h
 delete mode 120000 custom_mutators/honggfuzz/util.h

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/common.h b/custom_mutators/honggfuzz/common.h
deleted file mode 100644
index c8cf1329..00000000
--- a/custom_mutators/honggfuzz/common.h
+++ /dev/null
@@ -1,3 +0,0 @@
-#ifndef LOG_E
-  #define LOG_E LOG_F
-#endif
diff --git a/custom_mutators/honggfuzz/libhfcommon b/custom_mutators/honggfuzz/libhfcommon
deleted file mode 120000
index 945c9b46..00000000
--- a/custom_mutators/honggfuzz/libhfcommon
+++ /dev/null
@@ -1 +0,0 @@
-.
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/libhfcommon/common.h b/custom_mutators/honggfuzz/libhfcommon/common.h
new file mode 100644
index 00000000..c8cf1329
--- /dev/null
+++ b/custom_mutators/honggfuzz/libhfcommon/common.h
@@ -0,0 +1,3 @@
+#ifndef LOG_E
+  #define LOG_E LOG_F
+#endif
diff --git a/custom_mutators/honggfuzz/libhfcommon/log.h b/custom_mutators/honggfuzz/libhfcommon/log.h
new file mode 120000
index 00000000..51e19654
--- /dev/null
+++ b/custom_mutators/honggfuzz/libhfcommon/log.h
@@ -0,0 +1 @@
+common.h
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/libhfcommon/util.h b/custom_mutators/honggfuzz/libhfcommon/util.h
new file mode 120000
index 00000000..51e19654
--- /dev/null
+++ b/custom_mutators/honggfuzz/libhfcommon/util.h
@@ -0,0 +1 @@
+common.h
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/log.h b/custom_mutators/honggfuzz/log.h
deleted file mode 120000
index 51e19654..00000000
--- a/custom_mutators/honggfuzz/log.h
+++ /dev/null
@@ -1 +0,0 @@
-common.h
\ No newline at end of file
diff --git a/custom_mutators/honggfuzz/util.h b/custom_mutators/honggfuzz/util.h
deleted file mode 120000
index 51e19654..00000000
--- a/custom_mutators/honggfuzz/util.h
+++ /dev/null
@@ -1 +0,0 @@
-common.h
\ No newline at end of file
-- 
cgit 1.4.1


From 5c239451cfd1562ce72a78eefc6886fd76f2c132 Mon Sep 17 00:00:00 2001
From: vanhauser-thc <vh@thc.org>
Date: Thu, 25 Feb 2021 09:15:45 +0100
Subject: cmplog finetuning

---
 custom_mutators/honggfuzz/honggfuzz.h | 2 +-
 include/config.h                      | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

(limited to 'custom_mutators')

diff --git a/custom_mutators/honggfuzz/honggfuzz.h b/custom_mutators/honggfuzz/honggfuzz.h
index eb6a3f11..c80cdd87 100644
--- a/custom_mutators/honggfuzz/honggfuzz.h
+++ b/custom_mutators/honggfuzz/honggfuzz.h
@@ -39,7 +39,7 @@
 #include "libhfcommon/util.h"
 
 #define PROG_NAME    "honggfuzz"
-#define PROG_VERSION "2.3"
+#define PROG_VERSION "2.4"
 
 /* Name of the template which will be replaced with the proper name of the file */
 #define _HF_FILE_PLACEHOLDER "___FILE___"
diff --git a/include/config.h b/include/config.h
index 6120dcd6..439f4d2f 100644
--- a/include/config.h
+++ b/include/config.h
@@ -53,11 +53,11 @@
 #define CMPLOG_CORPUS_PERCENT 10U
 
 /* Number of potential positions from which we decide if cmplog becomes
-   useless, default 16384 */
-#define CMPLOG_POSITIONS_MAX 16384U
+   useless, default 8096 */
+#define CMPLOG_POSITIONS_MAX 8096U
 
-/* Maximum allowed fails per CMP value. Default: 96 */
-#define CMPLOG_FAIL_MAX 96
+/* Maximum allowed fails per CMP value. Default: 128 */
+#define CMPLOG_FAIL_MAX 128
 
 /* Now non-cmplog configuration options */
 
-- 
cgit 1.4.1


From a5da9ce42cab1eab93cf80ca744944ae26e6ab58 Mon Sep 17 00:00:00 2001
From: julihoh <julihoh@users.noreply.github.com>
Date: Sat, 27 Feb 2021 15:05:13 +0100
Subject: custom mutator rust support (#752)

* custom mutator rust support

* clarify how to view documentation for rust mutators

* remove `FuzzResult` hack and clarify lifetimes of CustomMutator::fuzz

* rename TErr associated tyep to Error to be more idiomatic

* fix warnings

* add example for fallible custom mutator

* make Fallible Custom Mutator the default and implement it's handle_err method by default

* rename CustomMutator::handle_err to handle_error

* add example mutator using lain
---
 custom_mutators/rust/.gitignore                    |  10 +
 custom_mutators/rust/Cargo.toml                    |   7 +
 custom_mutators/rust/README.md                     |   9 +
 custom_mutators/rust/custom_mutator-sys/Cargo.toml |  12 +
 custom_mutators/rust/custom_mutator-sys/build.rs   |  42 ++
 custom_mutators/rust/custom_mutator-sys/src/lib.rs |   5 +
 custom_mutators/rust/custom_mutator-sys/wrapper.h  |   4 +
 custom_mutators/rust/custom_mutator/Cargo.toml     |  13 +
 custom_mutators/rust/custom_mutator/src/lib.rs     | 637 +++++++++++++++++++++
 custom_mutators/rust/example/Cargo.toml            |  13 +
 custom_mutators/rust/example/src/lib.rs            |  50 ++
 custom_mutators/rust/example_lain/Cargo.toml       |  14 +
 custom_mutators/rust/example_lain/rust-toolchain   |   1 +
 custom_mutators/rust/example_lain/src/lib.rs       |  60 ++
 docs/custom_mutators.md                            |   5 +
 15 files changed, 882 insertions(+)
 create mode 100644 custom_mutators/rust/.gitignore
 create mode 100644 custom_mutators/rust/Cargo.toml
 create mode 100644 custom_mutators/rust/README.md
 create mode 100644 custom_mutators/rust/custom_mutator-sys/Cargo.toml
 create mode 100644 custom_mutators/rust/custom_mutator-sys/build.rs
 create mode 100644 custom_mutators/rust/custom_mutator-sys/src/lib.rs
 create mode 100644 custom_mutators/rust/custom_mutator-sys/wrapper.h
 create mode 100644 custom_mutators/rust/custom_mutator/Cargo.toml
 create mode 100644 custom_mutators/rust/custom_mutator/src/lib.rs
 create mode 100644 custom_mutators/rust/example/Cargo.toml
 create mode 100644 custom_mutators/rust/example/src/lib.rs
 create mode 100644 custom_mutators/rust/example_lain/Cargo.toml
 create mode 100644 custom_mutators/rust/example_lain/rust-toolchain
 create mode 100644 custom_mutators/rust/example_lain/src/lib.rs

(limited to 'custom_mutators')

diff --git a/custom_mutators/rust/.gitignore b/custom_mutators/rust/.gitignore
new file mode 100644
index 00000000..088ba6ba
--- /dev/null
+++ b/custom_mutators/rust/.gitignore
@@ -0,0 +1,10 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
diff --git a/custom_mutators/rust/Cargo.toml b/custom_mutators/rust/Cargo.toml
new file mode 100644
index 00000000..003bc58a
--- /dev/null
+++ b/custom_mutators/rust/Cargo.toml
@@ -0,0 +1,7 @@
+[workspace]
+members = [
+    "custom_mutator-sys",
+    "custom_mutator",
+    "example",
+    "example_lain",
+]
\ No newline at end of file
diff --git a/custom_mutators/rust/README.md b/custom_mutators/rust/README.md
new file mode 100644
index 00000000..119ac790
--- /dev/null
+++ b/custom_mutators/rust/README.md
@@ -0,0 +1,9 @@
+Bindings to create custom mutators in Rust.
+
+These bindings are documented with rustdoc. To view the documentation run
+```cargo doc -p custom_mutator --open```.
+
+A minimal example can be found in `example`.
+
+An example using [lain](https://github.com/microsoft/lain) can be found in `example_lain`.
+Since lain requires a nightly rust toolchain, you need to set one up before you can play with it.
diff --git a/custom_mutators/rust/custom_mutator-sys/Cargo.toml b/custom_mutators/rust/custom_mutator-sys/Cargo.toml
new file mode 100644
index 00000000..104f7df0
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator-sys/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "custom_mutator-sys"
+version = "0.1.0"
+authors = ["Julius Hohnerlein <julihoh@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[build-dependencies]
+bindgen = "0.56"
diff --git a/custom_mutators/rust/custom_mutator-sys/build.rs b/custom_mutators/rust/custom_mutator-sys/build.rs
new file mode 100644
index 00000000..3c88a90d
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator-sys/build.rs
@@ -0,0 +1,42 @@
+extern crate bindgen;
+
+use std::env;
+use std::path::PathBuf;
+
+// this code is largely taken straight from the handbook: https://github.com/fitzgen/bindgen-tutorial-bzip2-sys
+fn main() {
+    // Tell cargo to invalidate the built crate whenever the wrapper changes
+    println!("cargo:rerun-if-changed=wrapper.h");
+
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    let bindings = bindgen::Builder::default()
+        // The input header we would like to generate
+        // bindings for.
+        .header("wrapper.h")
+        .whitelist_type("afl_state_t")
+        .blacklist_type(r"u\d+")
+        .opaque_type(r"_.*")
+        .opaque_type("FILE")
+        .opaque_type("in_addr(_t)?")
+        .opaque_type("in_port(_t)?")
+        .opaque_type("sa_family(_t)?")
+        .opaque_type("sockaddr_in(_t)?")
+        .opaque_type("time_t")
+        .rustfmt_bindings(true)
+        .size_t_is_usize(true)
+        // Tell cargo to invalidate the built crate whenever any of the
+        // included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        // Finish the builder and generate the bindings.
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}
diff --git a/custom_mutators/rust/custom_mutator-sys/src/lib.rs b/custom_mutators/rust/custom_mutator-sys/src/lib.rs
new file mode 100644
index 00000000..a38a13a8
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator-sys/src/lib.rs
@@ -0,0 +1,5 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
diff --git a/custom_mutators/rust/custom_mutator-sys/wrapper.h b/custom_mutators/rust/custom_mutator-sys/wrapper.h
new file mode 100644
index 00000000..81cdb90f
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator-sys/wrapper.h
@@ -0,0 +1,4 @@
+#include "../../../include/afl-fuzz.h"
+#include "../../../include/common.h"
+#include "../../../include/config.h"
+#include "../../../include/debug.h"
diff --git a/custom_mutators/rust/custom_mutator/Cargo.toml b/custom_mutators/rust/custom_mutator/Cargo.toml
new file mode 100644
index 00000000..2d3cdbfa
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "custom_mutator"
+version = "0.1.0"
+authors = ["Julius Hohnerlein <julihoh@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+afl_internals = ["custom_mutator-sys"]
+
+[dependencies]
+custom_mutator-sys = { path = "../custom_mutator-sys", optional=true }
diff --git a/custom_mutators/rust/custom_mutator/src/lib.rs b/custom_mutators/rust/custom_mutator/src/lib.rs
new file mode 100644
index 00000000..0fb007ab
--- /dev/null
+++ b/custom_mutators/rust/custom_mutator/src/lib.rs
@@ -0,0 +1,637 @@
+//! Somewhat safe and somewhat ergonomic bindings for creating [AFL++](https://github.com/AFLplusplus/AFLplusplus) [custom mutators](https://github.com/AFLplusplus/AFLplusplus/blob/stable/docs/custom_mutators.md) in Rust.
+//!
+//! # Usage
+//! AFL++ custom mutators are expected to be dynamic libraries which expose a set of symbols.
+//! Check out [`CustomMutator`] to see which functions of the API are supported.
+//! Then use [`export_mutator`] to export the correct symbols for your mutator.
+//! In order to use the mutator, your crate needs to be a library crate and have a `crate-type` of `cdylib`.
+//! Putting
+//! ```yaml
+//! [lib]
+//! crate-type = ["cdylib"]
+//! ```
+//! into your `Cargo.toml` should do the trick.
+//! The final executable can be found in `target/(debug|release)/your_crate_name.so`.
+//! # Example
+//! See [`export_mutator`] for an example.
+//!
+//! # On `panic`s
+//! This binding is panic-safe in that it will prevent panics from unwinding into AFL++. Any panic will `abort` at the boundary between the custom mutator and AFL++.
+//!
+//! # Access to AFL++ internals
+//! This crate has an optional feature "afl_internals", which gives access to AFL++'s internal state.
+//! The state is passed to [`CustomMutator::init`], when the feature is activated.
+//!
+//! _This is completely unsafe and uses automatically generated types extracted from the AFL++ source._
+use std::{ffi::CStr, fmt::Debug, os::raw::c_uint};
+
+#[cfg(feature = "afl_internals")]
+#[doc(hidden)]
+pub use custom_mutator_sys::afl_state;
+
+#[allow(unused_variables)]
+#[doc(hidden)]
+pub trait RawCustomMutator {
+    #[cfg(feature = "afl_internals")]
+    fn init(afl: &'static afl_state, seed: c_uint) -> Self
+    where
+        Self: Sized;
+    #[cfg(not(feature = "afl_internals"))]
+    fn init(seed: c_uint) -> Self
+    where
+        Self: Sized;
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Option<&'b [u8]>;
+
+    fn fuzz_count(&mut self, buffer: &[u8]) -> u32 {
+        1
+    }
+
+    fn queue_new_entry(&mut self, filename_new_queue: &CStr, _filename_orig_queue: Option<&CStr>) {}
+
+    fn queue_get(&mut self, filename: &CStr) -> bool {
+        true
+    }
+
+    fn describe(&mut self, max_description: usize) -> Option<&CStr> {
+        None
+    }
+
+    fn introspection(&mut self) -> Option<&CStr> {
+        None
+    }
+
+    /*fn post_process(&self, buffer: &[u8], unsigned char **out_buf)-> usize;
+    int afl_custom_init_trim(&self, buffer: &[u8]);
+    size_t afl_custom_trim(&self, unsigned char **out_buf);
+    int afl_custom_post_trim(&self, unsigned char success);
+    size_t afl_custom_havoc_mutation(&self, buffer: &[u8], unsigned char **out_buf, size_t max_size);
+    unsigned char afl_custom_havoc_mutation_probability(&self);*/
+}
+
+/// Wrappers for the custom mutator which provide the bridging between the C API and CustomMutator.
+/// These wrappers are not intended to be used directly, rather export_mutator will use them to publish the custom mutator C API.
+#[doc(hidden)]
+pub mod wrappers {
+    #[cfg(feature = "afl_internals")]
+    use custom_mutator_sys::afl_state;
+
+    use core::slice;
+    use std::{
+        any::Any,
+        convert::TryInto,
+        ffi::{c_void, CStr},
+        mem::ManuallyDrop,
+        os::raw::{c_char, c_uint},
+        panic::catch_unwind,
+        process::abort,
+        ptr::null,
+    };
+
+    use crate::RawCustomMutator;
+
+    /// A structure to be used as the data pointer for our custom mutator. This was used as additional storage and is kept for now in case its needed later.
+    /// Also has some convenience functions for FFI conversions (from and to ptr) and tries to make misuse hard (see [`FFIContext::from`]).
+    struct FFIContext<M: RawCustomMutator> {
+        mutator: M,
+    }
+
+    impl<M: RawCustomMutator> FFIContext<M> {
+        fn from(ptr: *mut c_void) -> ManuallyDrop<Box<Self>> {
+            assert!(!ptr.is_null());
+            ManuallyDrop::new(unsafe { Box::from_raw(ptr as *mut Self) })
+        }
+
+        fn into_ptr(self: Box<Self>) -> *const c_void {
+            Box::into_raw(self) as *const c_void
+        }
+
+        #[cfg(feature = "afl_internals")]
+        fn new(afl: &'static afl_state, seed: c_uint) -> Box<Self> {
+            Box::new(Self {
+                mutator: M::init(afl, seed),
+            })
+        }
+        #[cfg(not(feature = "afl_internals"))]
+        fn new(seed: c_uint) -> Box<Self> {
+            Box::new(Self {
+                mutator: M::init(seed),
+            })
+        }
+    }
+
+    /// panic handler called for every panic
+    fn panic_handler(method: &str, panic_info: Box<dyn Any + Send + 'static>) -> ! {
+        use std::ops::Deref;
+        let cause = panic_info
+            .downcast_ref::<String>()
+            .map(String::deref)
+            .unwrap_or_else(|| {
+                panic_info
+                    .downcast_ref::<&str>()
+                    .copied()
+                    .unwrap_or("<cause unknown>")
+            });
+        eprintln!("A panic occurred at {}: {}", method, cause);
+        abort()
+    }
+
+    /// Internal function used in the macro
+    #[cfg(not(feature = "afl_internals"))]
+    pub fn afl_custom_init_<M: RawCustomMutator>(seed: c_uint) -> *const c_void {
+        match catch_unwind(|| FFIContext::<M>::new(seed).into_ptr()) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_init", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    #[cfg(feature = "afl_internals")]
+    pub fn afl_custom_init_<M: RawCustomMutator>(
+        afl: Option<&'static afl_state>,
+        seed: c_uint,
+    ) -> *const c_void {
+        match catch_unwind(|| {
+            let afl = afl.expect("mutator func called with NULL afl");
+            FFIContext::<M>::new(afl, seed).into_ptr()
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_init", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub unsafe fn afl_custom_fuzz_<M: RawCustomMutator>(
+        data: *mut c_void,
+        buf: *mut u8,
+        buf_size: usize,
+        out_buf: *mut *const u8,
+        add_buf: *mut u8,
+        add_buf_size: usize,
+        max_size: usize,
+    ) -> usize {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            if buf.is_null() {
+                panic!("null buf passed to afl_custom_fuzz")
+            }
+            if out_buf.is_null() {
+                panic!("null out_buf passed to afl_custom_fuzz")
+            }
+            let buff_slice = slice::from_raw_parts_mut(buf, buf_size);
+            let add_buff_slice = if add_buf.is_null() {
+                None
+            } else {
+                Some(slice::from_raw_parts(add_buf, add_buf_size))
+            };
+            match context
+                .mutator
+                .fuzz(buff_slice, add_buff_slice, max_size.try_into().unwrap())
+            {
+                Some(buffer) => {
+                    *out_buf = buffer.as_ptr();
+                    buffer.len().try_into().unwrap()
+                }
+                None => {
+                    // return the input buffer with 0-length to let AFL skip this mutation attempt
+                    *out_buf = buf;
+                    0
+                }
+            }
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_fuzz", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub unsafe fn afl_custom_fuzz_count_<M: RawCustomMutator>(
+        data: *mut c_void,
+        buf: *const u8,
+        buf_size: usize,
+    ) -> u32 {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            if buf.is_null() {
+                panic!("null buf passed to afl_custom_fuzz")
+            }
+            let buf_slice = slice::from_raw_parts(buf, buf_size);
+            // see https://doc.rust-lang.org/nomicon/borrow-splitting.html
+            let ctx = &mut **context;
+            let mutator = &mut ctx.mutator;
+            mutator.fuzz_count(buf_slice)
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_fuzz_count", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub fn afl_custom_queue_new_entry_<M: RawCustomMutator>(
+        data: *mut c_void,
+        filename_new_queue: *const c_char,
+        filename_orig_queue: *const c_char,
+    ) {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            if filename_new_queue.is_null() {
+                panic!("received null filename_new_queue in afl_custom_queue_new_entry");
+            }
+            let filename_new_queue = unsafe { CStr::from_ptr(filename_new_queue) };
+            let filename_orig_queue = if !filename_orig_queue.is_null() {
+                Some(unsafe { CStr::from_ptr(filename_orig_queue) })
+            } else {
+                None
+            };
+            context
+                .mutator
+                .queue_new_entry(filename_new_queue, filename_orig_queue);
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_queue_new_entry", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub unsafe fn afl_custom_deinit_<M: RawCustomMutator>(data: *mut c_void) {
+        match catch_unwind(|| {
+            // drop the context
+            ManuallyDrop::into_inner(FFIContext::<M>::from(data));
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_deinit", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub fn afl_custom_introspection_<M: RawCustomMutator>(data: *mut c_void) -> *const c_char {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            if let Some(res) = context.mutator.introspection() {
+                res.as_ptr()
+            } else {
+                null()
+            }
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_introspection", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub fn afl_custom_describe_<M: RawCustomMutator>(
+        data: *mut c_void,
+        max_description_len: usize,
+    ) -> *const c_char {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            if let Some(res) = context.mutator.describe(max_description_len) {
+                res.as_ptr()
+            } else {
+                null()
+            }
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_describe", err),
+        }
+    }
+
+    /// Internal function used in the macro
+    pub fn afl_custom_queue_get_<M: RawCustomMutator>(
+        data: *mut c_void,
+        filename: *const c_char,
+    ) -> u8 {
+        match catch_unwind(|| {
+            let mut context = FFIContext::<M>::from(data);
+            assert!(!filename.is_null());
+
+            context
+                .mutator
+                .queue_get(unsafe { CStr::from_ptr(filename) }) as u8
+        }) {
+            Ok(ret) => ret,
+            Err(err) => panic_handler("afl_custom_queue_get", err),
+        }
+    }
+}
+
+/// exports the given Mutator as a custom mutator as the C interface that AFL++ expects.
+/// It is not possible to call this macro multiple times, because it would define the custom mutator symbols multiple times.
+/// # Example
+/// ```
+/// # #[macro_use] extern crate custom_mutator;
+/// # #[cfg(feature = "afl_internals")]
+/// # use custom_mutator::afl_state;
+/// # use custom_mutator::CustomMutator;
+/// # use std::os::raw::c_uint;
+/// struct MyMutator;
+/// impl CustomMutator for MyMutator {
+///     /// ...
+/// #  type Error = ();
+/// #  #[cfg(feature = "afl_internals")]
+/// #  fn init(_afl_state: &afl_state, _seed: c_uint) -> Result<Self,()> {unimplemented!()}
+/// #  #[cfg(not(feature = "afl_internals"))]
+/// #  fn init(_seed: c_uint) -> Result<Self,()> {unimplemented!()}
+/// #  fn fuzz<'b,'s:'b>(&'s mut self, _buffer: &'b mut [u8], _add_buff: Option<&[u8]>, _max_size: usize) -> Result<Option<&'b [u8]>,()> {unimplemented!()}
+/// }
+/// export_mutator!(MyMutator);
+/// ```
+#[macro_export]
+macro_rules! export_mutator {
+    ($mutator_type:ty) => {
+        #[cfg(feature = "afl_internals")]
+        #[no_mangle]
+        pub extern "C" fn afl_custom_init(
+            afl: ::std::option::Option<&'static $crate::afl_state>,
+            seed: ::std::os::raw::c_uint,
+        ) -> *const ::std::os::raw::c_void {
+            $crate::wrappers::afl_custom_init_::<$mutator_type>(afl, seed)
+        }
+
+        #[cfg(not(feature = "afl_internals"))]
+        #[no_mangle]
+        pub extern "C" fn afl_custom_init(
+            _afl: *const ::std::os::raw::c_void,
+            seed: ::std::os::raw::c_uint,
+        ) -> *const ::std::os::raw::c_void {
+            $crate::wrappers::afl_custom_init_::<$mutator_type>(seed)
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_fuzz_count(
+            data: *mut ::std::os::raw::c_void,
+            buf: *const u8,
+            buf_size: usize,
+        ) -> u32 {
+            unsafe {
+                $crate::wrappers::afl_custom_fuzz_count_::<$mutator_type>(data, buf, buf_size)
+            }
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_fuzz(
+            data: *mut ::std::os::raw::c_void,
+            buf: *mut u8,
+            buf_size: usize,
+            out_buf: *mut *const u8,
+            add_buf: *mut u8,
+            add_buf_size: usize,
+            max_size: usize,
+        ) -> usize {
+            unsafe {
+                $crate::wrappers::afl_custom_fuzz_::<$mutator_type>(
+                    data,
+                    buf,
+                    buf_size,
+                    out_buf,
+                    add_buf,
+                    add_buf_size,
+                    max_size,
+                )
+            }
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_queue_new_entry(
+            data: *mut ::std::os::raw::c_void,
+            filename_new_queue: *const ::std::os::raw::c_char,
+            filename_orig_queue: *const ::std::os::raw::c_char,
+        ) {
+            $crate::wrappers::afl_custom_queue_new_entry_::<$mutator_type>(
+                data,
+                filename_new_queue,
+                filename_orig_queue,
+            )
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_queue_get(
+            data: *mut ::std::os::raw::c_void,
+            filename: *const ::std::os::raw::c_char,
+        ) -> u8 {
+            $crate::wrappers::afl_custom_queue_get_::<$mutator_type>(data, filename)
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_introspection(
+            data: *mut ::std::os::raw::c_void,
+        ) -> *const ::std::os::raw::c_char {
+            $crate::wrappers::afl_custom_introspection_::<$mutator_type>(data)
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_describe(
+            data: *mut ::std::os::raw::c_void,
+            max_description_len: usize,
+        ) -> *const ::std::os::raw::c_char {
+            $crate::wrappers::afl_custom_describe_::<$mutator_type>(data, max_description_len)
+        }
+
+        #[no_mangle]
+        pub extern "C" fn afl_custom_deinit(data: *mut ::std::os::raw::c_void) {
+            unsafe { $crate::wrappers::afl_custom_deinit_::<$mutator_type>(data) }
+        }
+    };
+}
+
+#[cfg(test)]
+/// this sanity test is supposed to just find out whether an empty mutator being exported by the macro compiles
+mod sanity_test {
+    use std::os::raw::c_uint;
+
+    #[cfg(feature = "afl_internals")]
+    use super::afl_state;
+
+    use super::{export_mutator, RawCustomMutator};
+
+    struct ExampleMutator;
+
+    impl RawCustomMutator for ExampleMutator {
+        #[cfg(feature = "afl_internals")]
+        fn init(_afl: &afl_state, _seed: c_uint) -> Self {
+            unimplemented!()
+        }
+
+        #[cfg(not(feature = "afl_internals"))]
+        fn init(_seed: c_uint) -> Self {
+            unimplemented!()
+        }
+
+        fn fuzz<'b, 's: 'b>(
+            &'s mut self,
+            _buffer: &'b mut [u8],
+            _add_buff: Option<&[u8]>,
+            _max_size: usize,
+        ) -> Option<&'b [u8]> {
+            unimplemented!()
+        }
+    }
+
+    export_mutator!(ExampleMutator);
+}
+
+#[allow(unused_variables)]
+/// A custom mutator.
+/// [`CustomMutator::handle_error`] will be called in case any method returns an [`Result::Err`].
+pub trait CustomMutator {
+    /// The error type. All methods must return the same error type.
+    type Error: Debug;
+
+    /// The method which handles errors.
+    /// By default, this method will log the error to stderr if the environment variable "`AFL_CUSTOM_MUTATOR_DEBUG`" is set and non-empty.
+    /// After logging the error, execution will continue on a best-effort basis.
+    ///
+    /// This default behaviour can be customized by implementing this method.
+    fn handle_error(err: Self::Error) {
+        if std::env::var("AFL_CUSTOM_MUTATOR_DEBUG")
+            .map(|v| !v.is_empty())
+            .unwrap_or(false)
+        {
+            eprintln!("Error in custom mutator: {:?}", err)
+        }
+    }
+
+    #[cfg(feature = "afl_internals")]
+    fn init(afl: &'static afl_state, seed: c_uint) -> Result<Self, Self::Error>
+    where
+        Self: Sized;
+
+    #[cfg(not(feature = "afl_internals"))]
+    fn init(seed: c_uint) -> Result<Self, Self::Error>
+    where
+        Self: Sized;
+
+    fn fuzz_count(&mut self, buffer: &[u8]) -> Result<u32, Self::Error> {
+        Ok(1)
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, Self::Error>;
+
+    fn queue_new_entry(
+        &mut self,
+        filename_new_queue: &CStr,
+        filename_orig_queue: Option<&CStr>,
+    ) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn queue_get(&mut self, filename: &CStr) -> Result<bool, Self::Error> {
+        Ok(true)
+    }
+
+    fn describe(&mut self, max_description: usize) -> Result<Option<&CStr>, Self::Error> {
+        Ok(None)
+    }
+
+    fn introspection(&mut self) -> Result<Option<&CStr>, Self::Error> {
+        Ok(None)
+    }
+}
+
+impl<M> RawCustomMutator for M
+where
+    M: CustomMutator,
+    M::Error: Debug,
+{
+    #[cfg(feature = "afl_internals")]
+    fn init(afl: &'static afl_state, seed: c_uint) -> Self
+    where
+        Self: Sized,
+    {
+        match Self::init(afl, seed) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                panic!("Error in afl_custom_init")
+            }
+        }
+    }
+
+    #[cfg(not(feature = "afl_internals"))]
+    fn init(seed: c_uint) -> Self
+    where
+        Self: Sized,
+    {
+        match Self::init(seed) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                panic!("Error in afl_custom_init")
+            }
+        }
+    }
+
+    fn fuzz_count(&mut self, buffer: &[u8]) -> u32 {
+        match self.fuzz_count(buffer) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                0
+            }
+        }
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Option<&'b [u8]> {
+        match self.fuzz(buffer, add_buff, max_size) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                None
+            }
+        }
+    }
+
+    fn queue_new_entry(&mut self, filename_new_queue: &CStr, filename_orig_queue: Option<&CStr>) {
+        match self.queue_new_entry(filename_new_queue, filename_orig_queue) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+            }
+        }
+    }
+
+    fn queue_get(&mut self, filename: &CStr) -> bool {
+        match self.queue_get(filename) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                false
+            }
+        }
+    }
+
+    fn describe(&mut self, max_description: usize) -> Option<&CStr> {
+        match self.describe(max_description) {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                None
+            }
+        }
+    }
+
+    fn introspection(&mut self) -> Option<&CStr> {
+        match self.introspection() {
+            Ok(r) => r,
+            Err(e) => {
+                Self::handle_error(e);
+                None
+            }
+        }
+    }
+}
diff --git a/custom_mutators/rust/example/Cargo.toml b/custom_mutators/rust/example/Cargo.toml
new file mode 100644
index 00000000..0c89b200
--- /dev/null
+++ b/custom_mutators/rust/example/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "example"
+version = "0.1.0"
+authors = ["Julius Hohnerlein <julihoh@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+custom_mutator = { path = "../custom_mutator" }
+
+[lib]
+crate-type = ["cdylib"]
\ No newline at end of file
diff --git a/custom_mutators/rust/example/src/lib.rs b/custom_mutators/rust/example/src/lib.rs
new file mode 100644
index 00000000..4f9345c0
--- /dev/null
+++ b/custom_mutators/rust/example/src/lib.rs
@@ -0,0 +1,50 @@
+#![allow(unused_variables)]
+
+use custom_mutator::{export_mutator, CustomMutator};
+use std::os::raw::c_uint;
+
+struct ExampleMutator;
+
+impl CustomMutator for ExampleMutator {
+    type Error = ();
+
+    fn init(seed: c_uint) -> Result<Self, ()> {
+        Ok(Self)
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, ()> {
+        buffer.reverse();
+        Ok(Some(buffer))
+    }
+}
+
+struct OwnBufferExampleMutator {
+    own_buffer: Vec<u8>,
+}
+
+impl CustomMutator for OwnBufferExampleMutator {
+    type Error = ();
+
+    fn init(seed: c_uint) -> Result<Self, ()> {
+        Ok(Self {
+            own_buffer: Vec::new(),
+        })
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, ()> {
+        self.own_buffer.reverse();
+        Ok(Some(self.own_buffer.as_slice()))
+    }
+}
+
+export_mutator!(ExampleMutator);
diff --git a/custom_mutators/rust/example_lain/Cargo.toml b/custom_mutators/rust/example_lain/Cargo.toml
new file mode 100644
index 00000000..1f68c7e0
--- /dev/null
+++ b/custom_mutators/rust/example_lain/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "example_lain"
+version = "0.1.0"
+authors = ["Julius Hohnerlein <julihoh@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+custom_mutator = { path = "../custom_mutator" }
+lain="0.5"
+
+[lib]
+crate-type = ["cdylib"]
\ No newline at end of file
diff --git a/custom_mutators/rust/example_lain/rust-toolchain b/custom_mutators/rust/example_lain/rust-toolchain
new file mode 100644
index 00000000..07ade694
--- /dev/null
+++ b/custom_mutators/rust/example_lain/rust-toolchain
@@ -0,0 +1 @@
+nightly
\ No newline at end of file
diff --git a/custom_mutators/rust/example_lain/src/lib.rs b/custom_mutators/rust/example_lain/src/lib.rs
new file mode 100644
index 00000000..3336e861
--- /dev/null
+++ b/custom_mutators/rust/example_lain/src/lib.rs
@@ -0,0 +1,60 @@
+use custom_mutator::{export_mutator, CustomMutator};
+use lain::{
+    mutator::Mutator,
+    prelude::*,
+    rand::{rngs::StdRng, SeedableRng},
+};
+use std::os::raw::c_uint;
+
+#[derive(Debug, Mutatable, NewFuzzed, BinarySerialize)]
+struct MyStruct {
+    field_1: u8,
+
+    #[lain(bits = 3)]
+    field_2: u8,
+
+    #[lain(bits = 5)]
+    field_3: u8,
+
+    #[lain(min = 5, max = 10000)]
+    field_4: u32,
+
+    #[lain(ignore)]
+    ignored_field: u64,
+}
+
+struct LainMutator {
+    mutator: Mutator<StdRng>,
+    buffer: Vec<u8>,
+}
+
+impl CustomMutator for LainMutator {
+    type Error = ();
+
+    fn init(seed: c_uint) -> Result<Self, ()> {
+        Ok(Self {
+            mutator: Mutator::new(StdRng::seed_from_u64(seed as u64)),
+            buffer: Vec::new(),
+        })
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        _buffer: &'b mut [u8],
+        _add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, ()> {
+        // we just sample an instance of MyStruct, ignoring the current input
+        let instance = MyStruct::new_fuzzed(&mut self.mutator, None);
+        let size = instance.serialized_size();
+        if size > max_size {
+            return Err(());
+        }
+        self.buffer.clear();
+        self.buffer.reserve(size);
+        instance.binary_serialize::<_, BigEndian>(&mut self.buffer);
+        Ok(Some(self.buffer.as_slice()))
+    }
+}
+
+export_mutator!(LainMutator);
diff --git a/docs/custom_mutators.md b/docs/custom_mutators.md
index a2c544e3..61d711e4 100644
--- a/docs/custom_mutators.md
+++ b/docs/custom_mutators.md
@@ -4,6 +4,11 @@ This file describes how you can implement custom mutations to be used in AFL.
 For now, we support C/C++ library and Python module, collectivelly named as the
 custom mutator.
 
+There is also experimental support for Rust in `custom_mutators/rust`.
+Please refer to that directory for documentation.
+Run ```cargo doc -p custom_mutator --open``` in that directory to view the
+documentation in your web browser.
+
 Implemented by
 - C/C++ library (`*.so`): Khaled Yakdan from Code Intelligence (<yakdan@code-intelligence.de>)
 - Python module: Christian Holler from Mozilla (<choller@mozilla.com>)
-- 
cgit 1.4.1


From c219502f0fe654927c3f74f9791f786f0740f344 Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Sat, 27 Feb 2021 15:52:36 +0100
Subject: some rust cleanup

---
 custom_mutators/rust/Cargo.toml                    |  3 +-
 custom_mutators/rust/README.md                     |  6 ++-
 custom_mutators/rust/custom_mutator/src/lib.rs     | 39 +++++++-------
 custom_mutators/rust/example/Cargo.toml            |  6 ++-
 .../rust/example/src/example_mutator.rs            | 49 ++++++++++++++++++
 custom_mutators/rust/example/src/lib.rs            | 50 ------------------
 custom_mutators/rust/example_lain/Cargo.toml       |  4 +-
 .../rust/example_lain/src/lain_mutator.rs          | 59 +++++++++++++++++++++
 custom_mutators/rust/example_lain/src/lib.rs       | 60 ----------------------
 9 files changed, 139 insertions(+), 137 deletions(-)
 create mode 100644 custom_mutators/rust/example/src/example_mutator.rs
 delete mode 100644 custom_mutators/rust/example/src/lib.rs
 create mode 100644 custom_mutators/rust/example_lain/src/lain_mutator.rs
 delete mode 100644 custom_mutators/rust/example_lain/src/lib.rs

(limited to 'custom_mutators')

diff --git a/custom_mutators/rust/Cargo.toml b/custom_mutators/rust/Cargo.toml
index 003bc58a..e36d24b5 100644
--- a/custom_mutators/rust/Cargo.toml
+++ b/custom_mutators/rust/Cargo.toml
@@ -3,5 +3,6 @@ members = [
     "custom_mutator-sys",
     "custom_mutator",
     "example",
-    "example_lain",
+    # Lain needs a nightly toolchain
+    # "example_lain",
 ]
\ No newline at end of file
diff --git a/custom_mutators/rust/README.md b/custom_mutators/rust/README.md
index 119ac790..e2cc38b4 100644
--- a/custom_mutators/rust/README.md
+++ b/custom_mutators/rust/README.md
@@ -1,9 +1,11 @@
+# Rust Custom Mutators
+
 Bindings to create custom mutators in Rust.
 
 These bindings are documented with rustdoc. To view the documentation run
 ```cargo doc -p custom_mutator --open```.
 
-A minimal example can be found in `example`.
+A minimal example can be found in `example`. Build it using `cargo build --example example_mutator`. 
 
-An example using [lain](https://github.com/microsoft/lain) can be found in `example_lain`.
+An example using [lain](https://github.com/microsoft/lain) for structured fuzzing can be found in `example_lain`.
 Since lain requires a nightly rust toolchain, you need to set one up before you can play with it.
diff --git a/custom_mutators/rust/custom_mutator/src/lib.rs b/custom_mutators/rust/custom_mutator/src/lib.rs
index 0fb007ab..b82af250 100644
--- a/custom_mutators/rust/custom_mutator/src/lib.rs
+++ b/custom_mutators/rust/custom_mutator/src/lib.rs
@@ -23,7 +23,7 @@
 //! The state is passed to [`CustomMutator::init`], when the feature is activated.
 //!
 //! _This is completely unsafe and uses automatically generated types extracted from the AFL++ source._
-use std::{ffi::CStr, fmt::Debug, os::raw::c_uint};
+use std::{ffi::CStr, fmt::Debug};
 
 #[cfg(feature = "afl_internals")]
 #[doc(hidden)]
@@ -37,7 +37,7 @@ pub trait RawCustomMutator {
     where
         Self: Sized;
     #[cfg(not(feature = "afl_internals"))]
-    fn init(seed: c_uint) -> Self
+    fn init(seed: u32) -> Self
     where
         Self: Sized;
 
@@ -87,7 +87,7 @@ pub mod wrappers {
         convert::TryInto,
         ffi::{c_void, CStr},
         mem::ManuallyDrop,
-        os::raw::{c_char, c_uint},
+        os::raw::c_char,
         panic::catch_unwind,
         process::abort,
         ptr::null,
@@ -112,13 +112,13 @@ pub mod wrappers {
         }
 
         #[cfg(feature = "afl_internals")]
-        fn new(afl: &'static afl_state, seed: c_uint) -> Box<Self> {
+        fn new(afl: &'static afl_state, seed: u32) -> Box<Self> {
             Box::new(Self {
                 mutator: M::init(afl, seed),
             })
         }
         #[cfg(not(feature = "afl_internals"))]
-        fn new(seed: c_uint) -> Box<Self> {
+        fn new(seed: u32) -> Box<Self> {
             Box::new(Self {
                 mutator: M::init(seed),
             })
@@ -143,7 +143,7 @@ pub mod wrappers {
 
     /// Internal function used in the macro
     #[cfg(not(feature = "afl_internals"))]
-    pub fn afl_custom_init_<M: RawCustomMutator>(seed: c_uint) -> *const c_void {
+    pub fn afl_custom_init_<M: RawCustomMutator>(seed: u32) -> *const c_void {
         match catch_unwind(|| FFIContext::<M>::new(seed).into_ptr()) {
             Ok(ret) => ret,
             Err(err) => panic_handler("afl_custom_init", err),
@@ -154,7 +154,7 @@ pub mod wrappers {
     #[cfg(feature = "afl_internals")]
     pub fn afl_custom_init_<M: RawCustomMutator>(
         afl: Option<&'static afl_state>,
-        seed: c_uint,
+        seed: u32,
     ) -> *const c_void {
         match catch_unwind(|| {
             let afl = afl.expect("mutator func called with NULL afl");
@@ -328,16 +328,15 @@ pub mod wrappers {
 /// # #[cfg(feature = "afl_internals")]
 /// # use custom_mutator::afl_state;
 /// # use custom_mutator::CustomMutator;
-/// # use std::os::raw::c_uint;
 /// struct MyMutator;
 /// impl CustomMutator for MyMutator {
 ///     /// ...
 /// #  type Error = ();
 /// #  #[cfg(feature = "afl_internals")]
-/// #  fn init(_afl_state: &afl_state, _seed: c_uint) -> Result<Self,()> {unimplemented!()}
+/// #  fn init(_afl_state: &afl_state, _seed: u32) -> Result<Self,()> {unimplemented!()}
 /// #  #[cfg(not(feature = "afl_internals"))]
-/// #  fn init(_seed: c_uint) -> Result<Self,()> {unimplemented!()}
-/// #  fn fuzz<'b,'s:'b>(&'s mut self, _buffer: &'b mut [u8], _add_buff: Option<&[u8]>, _max_size: usize) -> Result<Option<&'b [u8]>,()> {unimplemented!()}
+/// #  fn init(_seed: u32) -> Result<Self, Self::Error> {unimplemented!()}
+/// #  fn fuzz<'b,'s:'b>(&'s mut self, _buffer: &'b mut [u8], _add_buff: Option<&[u8]>, _max_size: usize) -> Result<Option<&'b [u8]>, Self::Error> {unimplemented!()}
 /// }
 /// export_mutator!(MyMutator);
 /// ```
@@ -350,7 +349,7 @@ macro_rules! export_mutator {
             afl: ::std::option::Option<&'static $crate::afl_state>,
             seed: ::std::os::raw::c_uint,
         ) -> *const ::std::os::raw::c_void {
-            $crate::wrappers::afl_custom_init_::<$mutator_type>(afl, seed)
+            $crate::wrappers::afl_custom_init_::<$mutator_type>(afl, seed as u32)
         }
 
         #[cfg(not(feature = "afl_internals"))]
@@ -359,7 +358,7 @@ macro_rules! export_mutator {
             _afl: *const ::std::os::raw::c_void,
             seed: ::std::os::raw::c_uint,
         ) -> *const ::std::os::raw::c_void {
-            $crate::wrappers::afl_custom_init_::<$mutator_type>(seed)
+            $crate::wrappers::afl_custom_init_::<$mutator_type>(seed as u32)
         }
 
         #[no_mangle]
@@ -442,8 +441,6 @@ macro_rules! export_mutator {
 #[cfg(test)]
 /// this sanity test is supposed to just find out whether an empty mutator being exported by the macro compiles
 mod sanity_test {
-    use std::os::raw::c_uint;
-
     #[cfg(feature = "afl_internals")]
     use super::afl_state;
 
@@ -453,12 +450,12 @@ mod sanity_test {
 
     impl RawCustomMutator for ExampleMutator {
         #[cfg(feature = "afl_internals")]
-        fn init(_afl: &afl_state, _seed: c_uint) -> Self {
+        fn init(_afl: &afl_state, _seed: u32) -> Self {
             unimplemented!()
         }
 
         #[cfg(not(feature = "afl_internals"))]
-        fn init(_seed: c_uint) -> Self {
+        fn init(_seed: u32) -> Self {
             unimplemented!()
         }
 
@@ -497,12 +494,12 @@ pub trait CustomMutator {
     }
 
     #[cfg(feature = "afl_internals")]
-    fn init(afl: &'static afl_state, seed: c_uint) -> Result<Self, Self::Error>
+    fn init(afl: &'static afl_state, seed: u32) -> Result<Self, Self::Error>
     where
         Self: Sized;
 
     #[cfg(not(feature = "afl_internals"))]
-    fn init(seed: c_uint) -> Result<Self, Self::Error>
+    fn init(seed: u32) -> Result<Self, Self::Error>
     where
         Self: Sized;
 
@@ -544,7 +541,7 @@ where
     M::Error: Debug,
 {
     #[cfg(feature = "afl_internals")]
-    fn init(afl: &'static afl_state, seed: c_uint) -> Self
+    fn init(afl: &'static afl_state, seed: u32) -> Self
     where
         Self: Sized,
     {
@@ -558,7 +555,7 @@ where
     }
 
     #[cfg(not(feature = "afl_internals"))]
-    fn init(seed: c_uint) -> Self
+    fn init(seed: u32) -> Self
     where
         Self: Sized,
     {
diff --git a/custom_mutators/rust/example/Cargo.toml b/custom_mutators/rust/example/Cargo.toml
index 0c89b200..070d23b1 100644
--- a/custom_mutators/rust/example/Cargo.toml
+++ b/custom_mutators/rust/example/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "example"
+name = "example_mutator"
 version = "0.1.0"
 authors = ["Julius Hohnerlein <julihoh@users.noreply.github.com>"]
 edition = "2018"
@@ -9,5 +9,7 @@ edition = "2018"
 [dependencies]
 custom_mutator = { path = "../custom_mutator" }
 
-[lib]
+[[example]]
+name = "example_mutator"
+path = "./src/example_mutator.rs"
 crate-type = ["cdylib"]
\ No newline at end of file
diff --git a/custom_mutators/rust/example/src/example_mutator.rs b/custom_mutators/rust/example/src/example_mutator.rs
new file mode 100644
index 00000000..9b9d4997
--- /dev/null
+++ b/custom_mutators/rust/example/src/example_mutator.rs
@@ -0,0 +1,49 @@
+#![allow(unused_variables)]
+
+use custom_mutator::{export_mutator, CustomMutator};
+
+struct ExampleMutator;
+
+impl CustomMutator for ExampleMutator {
+    type Error = ();
+
+    fn init(seed: u32) -> Result<Self, Self::Error> {
+        Ok(Self)
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, Self::Error> {
+        buffer.reverse();
+        Ok(Some(buffer))
+    }
+}
+
+struct OwnBufferExampleMutator {
+    own_buffer: Vec<u8>,
+}
+
+impl CustomMutator for OwnBufferExampleMutator {
+    type Error = ();
+
+    fn init(seed: u32) -> Result<Self, Self::Error> {
+        Ok(Self {
+            own_buffer: Vec::new(),
+        })
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        buffer: &'b mut [u8],
+        add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, ()> {
+        self.own_buffer.reverse();
+        Ok(Some(self.own_buffer.as_slice()))
+    }
+}
+
+export_mutator!(ExampleMutator);
diff --git a/custom_mutators/rust/example/src/lib.rs b/custom_mutators/rust/example/src/lib.rs
deleted file mode 100644
index 4f9345c0..00000000
--- a/custom_mutators/rust/example/src/lib.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-#![allow(unused_variables)]
-
-use custom_mutator::{export_mutator, CustomMutator};
-use std::os::raw::c_uint;
-
-struct ExampleMutator;
-
-impl CustomMutator for ExampleMutator {
-    type Error = ();
-
-    fn init(seed: c_uint) -> Result<Self, ()> {
-        Ok(Self)
-    }
-
-    fn fuzz<'b, 's: 'b>(
-        &'s mut self,
-        buffer: &'b mut [u8],
-        add_buff: Option<&[u8]>,
-        max_size: usize,
-    ) -> Result<Option<&'b [u8]>, ()> {
-        buffer.reverse();
-        Ok(Some(buffer))
-    }
-}
-
-struct OwnBufferExampleMutator {
-    own_buffer: Vec<u8>,
-}
-
-impl CustomMutator for OwnBufferExampleMutator {
-    type Error = ();
-
-    fn init(seed: c_uint) -> Result<Self, ()> {
-        Ok(Self {
-            own_buffer: Vec::new(),
-        })
-    }
-
-    fn fuzz<'b, 's: 'b>(
-        &'s mut self,
-        buffer: &'b mut [u8],
-        add_buff: Option<&[u8]>,
-        max_size: usize,
-    ) -> Result<Option<&'b [u8]>, ()> {
-        self.own_buffer.reverse();
-        Ok(Some(self.own_buffer.as_slice()))
-    }
-}
-
-export_mutator!(ExampleMutator);
diff --git a/custom_mutators/rust/example_lain/Cargo.toml b/custom_mutators/rust/example_lain/Cargo.toml
index 1f68c7e0..29d606a4 100644
--- a/custom_mutators/rust/example_lain/Cargo.toml
+++ b/custom_mutators/rust/example_lain/Cargo.toml
@@ -10,5 +10,7 @@ edition = "2018"
 custom_mutator = { path = "../custom_mutator" }
 lain="0.5"
 
-[lib]
+[[example]]
+name = "example_lain"
+path = "./src/lain_mutator.rs"
 crate-type = ["cdylib"]
\ No newline at end of file
diff --git a/custom_mutators/rust/example_lain/src/lain_mutator.rs b/custom_mutators/rust/example_lain/src/lain_mutator.rs
new file mode 100644
index 00000000..22e5fe73
--- /dev/null
+++ b/custom_mutators/rust/example_lain/src/lain_mutator.rs
@@ -0,0 +1,59 @@
+use custom_mutator::{export_mutator, CustomMutator};
+use lain::{
+    mutator::Mutator,
+    prelude::*,
+    rand::{rngs::StdRng, SeedableRng},
+};
+
+#[derive(Debug, Mutatable, NewFuzzed, BinarySerialize)]
+struct MyStruct {
+    field_1: u8,
+
+    #[lain(bits = 3)]
+    field_2: u8,
+
+    #[lain(bits = 5)]
+    field_3: u8,
+
+    #[lain(min = 5, max = 10000)]
+    field_4: u32,
+
+    #[lain(ignore)]
+    ignored_field: u64,
+}
+
+struct LainMutator {
+    mutator: Mutator<StdRng>,
+    buffer: Vec<u8>,
+}
+
+impl CustomMutator for LainMutator {
+    type Error = ();
+
+    fn init(seed: u32) -> Result<Self, ()> {
+        Ok(Self {
+            mutator: Mutator::new(StdRng::seed_from_u64(seed as u64)),
+            buffer: Vec::new(),
+        })
+    }
+
+    fn fuzz<'b, 's: 'b>(
+        &'s mut self,
+        _buffer: &'b mut [u8],
+        _add_buff: Option<&[u8]>,
+        max_size: usize,
+    ) -> Result<Option<&'b [u8]>, ()> {
+        // we just sample an instance of MyStruct, ignoring the current input
+        let instance = MyStruct::new_fuzzed(&mut self.mutator, None);
+        let size = instance.serialized_size();
+        if size > max_size {
+            return Err(());
+        }
+        self.buffer.clear();
+        self.buffer.reserve(size);
+        instance.binary_serialize::<_, BigEndian>(&mut self.buffer);
+        Ok(Some(self.buffer.as_slice()))
+    }
+}
+
+export_mutator!(LainMutator);
diff --git a/custom_mutators/rust/example_lain/src/lib.rs b/custom_mutators/rust/example_lain/src/lib.rs
deleted file mode 100644
index 3336e861..00000000
--- a/custom_mutators/rust/example_lain/src/lib.rs
+++ /dev/null
@@ -1,60 +0,0 @@
-use custom_mutator::{export_mutator, CustomMutator};
-use lain::{
-    mutator::Mutator,
-    prelude::*,
-    rand::{rngs::StdRng, SeedableRng},
-};
-use std::os::raw::c_uint;
-
-#[derive(Debug, Mutatable, NewFuzzed, BinarySerialize)]
-struct MyStruct {
-    field_1: u8,
-
-    #[lain(bits = 3)]
-    field_2: u8,
-
-    #[lain(bits = 5)]
-    field_3: u8,
-
-    #[lain(min = 5, max = 10000)]
-    field_4: u32,
-
-    #[lain(ignore)]
-    ignored_field: u64,
-}
-
-struct LainMutator {
-    mutator: Mutator<StdRng>,
-    buffer: Vec<u8>,
-}
-
-impl CustomMutator for LainMutator {
-    type Error = ();
-
-    fn init(seed: c_uint) -> Result<Self, ()> {
-        Ok(Self {
-            mutator: Mutator::new(StdRng::seed_from_u64(seed as u64)),
-            buffer: Vec::new(),
-        })
-    }
-
-    fn fuzz<'b, 's: 'b>(
-        &'s mut self,
-        _buffer: &'b mut [u8],
-        _add_buff: Option<&[u8]>,
-        max_size: usize,
-    ) -> Result<Option<&'b [u8]>, ()> {
-        // we just sample an instance of MyStruct, ignoring the current input
-        let instance = MyStruct::new_fuzzed(&mut self.mutator, None);
-        let size = instance.serialized_size();
-        if size > max_size {
-            return Err(());
-        }
-        self.buffer.clear();
-        self.buffer.reserve(size);
-        instance.binary_serialize::<_, BigEndian>(&mut self.buffer);
-        Ok(Some(self.buffer.as_slice()))
-    }
-}
-
-export_mutator!(LainMutator);
-- 
cgit 1.4.1


From 2dd5a020615842e51dcf8cfaa7b01ad6bef4cda8 Mon Sep 17 00:00:00 2001
From: julihoh <julihoh@users.noreply.github.com>
Date: Fri, 5 Mar 2021 19:40:59 +0100
Subject: Ergonomic Improvements for Rust Custom Mutators (#772)

* allow returning of str instead of CStr in rust custom mutator

* use OsStr instead of CStr for file paths

* fix cfg and compiler errors

* custom mutator default descriptions

* fix usage of afl_internal feature flag

* fix example mutator cfg

* fix lain mutator

* Revert "fix lain mutator"

This reverts commit adf700180888d86e8331939cea62d0b39fc699a7.

* actually fix lain mutator

* resolve question around utf-8 null bytes

* change from OsStr to Path to be even more ergonomic

* add rust custom mutator ci

* fix github action

* again

* separate compilation check
---
 .github/workflows/rust_custom_mutator.yml          |  30 ++++
 custom_mutators/rust/custom_mutator/src/lib.rs     | 164 +++++++++++++++++----
 .../rust/example/src/example_mutator.rs            |   1 +
 .../rust/example_lain/src/lain_mutator.rs          |   2 +
 4 files changed, 168 insertions(+), 29 deletions(-)
 create mode 100644 .github/workflows/rust_custom_mutator.yml

(limited to 'custom_mutators')

diff --git a/.github/workflows/rust_custom_mutator.yml b/.github/workflows/rust_custom_mutator.yml
new file mode 100644
index 00000000..de2b184a
--- /dev/null
+++ b/.github/workflows/rust_custom_mutator.yml
@@ -0,0 +1,30 @@
+name: Rust Custom Mutators
+
+on:
+  push:
+    branches: [ stable, dev ]
+  pull_request:
+    branches: [ stable, dev ]
+
+jobs:
+  test:
+    name: Test Rust Custom Mutator Support
+    runs-on: '${{ matrix.os }}'
+    defaults:
+      run:
+        working-directory: custom_mutators/rust
+    strategy:
+      matrix:
+        os: [ubuntu-20.04]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust Toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - name: Check Code Compiles
+        run: cargo check
+      - name: Run General Tests
+        run: cargo test
+      - name: Run Tests for afl_internals feature flag
+        run: cd custom_mutator && cargo test --features=afl_internals
\ No newline at end of file
diff --git a/custom_mutators/rust/custom_mutator/src/lib.rs b/custom_mutators/rust/custom_mutator/src/lib.rs
index b82af250..9444e4d1 100644
--- a/custom_mutators/rust/custom_mutator/src/lib.rs
+++ b/custom_mutators/rust/custom_mutator/src/lib.rs
@@ -1,3 +1,4 @@
+#![cfg(unix)]
 //! Somewhat safe and somewhat ergonomic bindings for creating [AFL++](https://github.com/AFLplusplus/AFLplusplus) [custom mutators](https://github.com/AFLplusplus/AFLplusplus/blob/stable/docs/custom_mutators.md) in Rust.
 //!
 //! # Usage
@@ -23,7 +24,7 @@
 //! The state is passed to [`CustomMutator::init`], when the feature is activated.
 //!
 //! _This is completely unsafe and uses automatically generated types extracted from the AFL++ source._
-use std::{ffi::CStr, fmt::Debug};
+use std::{fmt::Debug, path::Path};
 
 #[cfg(feature = "afl_internals")]
 #[doc(hidden)]
@@ -33,7 +34,7 @@ pub use custom_mutator_sys::afl_state;
 #[doc(hidden)]
 pub trait RawCustomMutator {
     #[cfg(feature = "afl_internals")]
-    fn init(afl: &'static afl_state, seed: c_uint) -> Self
+    fn init(afl: &'static afl_state, seed: u32) -> Self
     where
         Self: Sized;
     #[cfg(not(feature = "afl_internals"))]
@@ -52,17 +53,17 @@ pub trait RawCustomMutator {
         1
     }
 
-    fn queue_new_entry(&mut self, filename_new_queue: &CStr, _filename_orig_queue: Option<&CStr>) {}
+    fn queue_new_entry(&mut self, filename_new_queue: &Path, _filename_orig_queue: Option<&Path>) {}
 
-    fn queue_get(&mut self, filename: &CStr) -> bool {
+    fn queue_get(&mut self, filename: &Path) -> bool {
         true
     }
 
-    fn describe(&mut self, max_description: usize) -> Option<&CStr> {
-        None
+    fn describe(&mut self, max_description: usize) -> Option<&str> {
+        Some(default_mutator_describe::<Self>(max_description))
     }
 
-    fn introspection(&mut self) -> Option<&CStr> {
+    fn introspection(&mut self) -> Option<&str> {
         None
     }
 
@@ -81,16 +82,17 @@ pub mod wrappers {
     #[cfg(feature = "afl_internals")]
     use custom_mutator_sys::afl_state;
 
-    use core::slice;
     use std::{
         any::Any,
         convert::TryInto,
-        ffi::{c_void, CStr},
+        ffi::{c_void, CStr, OsStr},
         mem::ManuallyDrop,
-        os::raw::c_char,
+        os::{raw::c_char, unix::ffi::OsStrExt},
         panic::catch_unwind,
+        path::Path,
         process::abort,
         ptr::null,
+        slice,
     };
 
     use crate::RawCustomMutator;
@@ -99,6 +101,10 @@ pub mod wrappers {
     /// Also has some convenience functions for FFI conversions (from and to ptr) and tries to make misuse hard (see [`FFIContext::from`]).
     struct FFIContext<M: RawCustomMutator> {
         mutator: M,
+        /// buffer for storing the description returned by [`RawCustomMutator::describe`] as a CString
+        description_buffer: Vec<u8>,
+        /// buffer for storing the introspection returned by [`RawCustomMutator::introspect`] as a CString
+        introspection_buffer: Vec<u8>,
     }
 
     impl<M: RawCustomMutator> FFIContext<M> {
@@ -115,12 +121,16 @@ pub mod wrappers {
         fn new(afl: &'static afl_state, seed: u32) -> Box<Self> {
             Box::new(Self {
                 mutator: M::init(afl, seed),
+                description_buffer: Vec::new(),
+                introspection_buffer: Vec::new(),
             })
         }
         #[cfg(not(feature = "afl_internals"))]
         fn new(seed: u32) -> Box<Self> {
             Box::new(Self {
                 mutator: M::init(seed),
+                description_buffer: Vec::new(),
+                introspection_buffer: Vec::new(),
             })
         }
     }
@@ -242,9 +252,13 @@ pub mod wrappers {
             if filename_new_queue.is_null() {
                 panic!("received null filename_new_queue in afl_custom_queue_new_entry");
             }
-            let filename_new_queue = unsafe { CStr::from_ptr(filename_new_queue) };
+            let filename_new_queue = Path::new(OsStr::from_bytes(
+                unsafe { CStr::from_ptr(filename_new_queue) }.to_bytes(),
+            ));
             let filename_orig_queue = if !filename_orig_queue.is_null() {
-                Some(unsafe { CStr::from_ptr(filename_orig_queue) })
+                Some(Path::new(OsStr::from_bytes(
+                    unsafe { CStr::from_ptr(filename_orig_queue) }.to_bytes(),
+                )))
             } else {
                 None
             };
@@ -271,9 +285,14 @@ pub mod wrappers {
     /// Internal function used in the macro
     pub fn afl_custom_introspection_<M: RawCustomMutator>(data: *mut c_void) -> *const c_char {
         match catch_unwind(|| {
-            let mut context = FFIContext::<M>::from(data);
+            let context = &mut *FFIContext::<M>::from(data);
             if let Some(res) = context.mutator.introspection() {
-                res.as_ptr()
+                let buf = &mut context.introspection_buffer;
+                buf.clear();
+                buf.extend_from_slice(res.as_bytes());
+                buf.push(0);
+                // unwrapping here, as the error case should be extremely rare
+                CStr::from_bytes_with_nul(&buf).unwrap().as_ptr()
             } else {
                 null()
             }
@@ -289,9 +308,14 @@ pub mod wrappers {
         max_description_len: usize,
     ) -> *const c_char {
         match catch_unwind(|| {
-            let mut context = FFIContext::<M>::from(data);
+            let context = &mut *FFIContext::<M>::from(data);
             if let Some(res) = context.mutator.describe(max_description_len) {
-                res.as_ptr()
+                let buf = &mut context.description_buffer;
+                buf.clear();
+                buf.extend_from_slice(res.as_bytes());
+                buf.push(0);
+                // unwrapping here, as the error case should be extremely rare
+                CStr::from_bytes_with_nul(&buf).unwrap().as_ptr()
             } else {
                 null()
             }
@@ -310,9 +334,9 @@ pub mod wrappers {
             let mut context = FFIContext::<M>::from(data);
             assert!(!filename.is_null());
 
-            context
-                .mutator
-                .queue_get(unsafe { CStr::from_ptr(filename) }) as u8
+            context.mutator.queue_get(Path::new(OsStr::from_bytes(
+                unsafe { CStr::from_ptr(filename) }.to_bytes(),
+            ))) as u8
         }) {
             Ok(ret) => ret,
             Err(err) => panic_handler("afl_custom_queue_get", err),
@@ -516,21 +540,21 @@ pub trait CustomMutator {
 
     fn queue_new_entry(
         &mut self,
-        filename_new_queue: &CStr,
-        filename_orig_queue: Option<&CStr>,
+        filename_new_queue: &Path,
+        filename_orig_queue: Option<&Path>,
     ) -> Result<(), Self::Error> {
         Ok(())
     }
 
-    fn queue_get(&mut self, filename: &CStr) -> Result<bool, Self::Error> {
+    fn queue_get(&mut self, filename: &Path) -> Result<bool, Self::Error> {
         Ok(true)
     }
 
-    fn describe(&mut self, max_description: usize) -> Result<Option<&CStr>, Self::Error> {
-        Ok(None)
+    fn describe(&mut self, max_description: usize) -> Result<Option<&str>, Self::Error> {
+        Ok(Some(default_mutator_describe::<Self>(max_description)))
     }
 
-    fn introspection(&mut self) -> Result<Option<&CStr>, Self::Error> {
+    fn introspection(&mut self) -> Result<Option<&str>, Self::Error> {
         Ok(None)
     }
 }
@@ -593,7 +617,7 @@ where
         }
     }
 
-    fn queue_new_entry(&mut self, filename_new_queue: &CStr, filename_orig_queue: Option<&CStr>) {
+    fn queue_new_entry(&mut self, filename_new_queue: &Path, filename_orig_queue: Option<&Path>) {
         match self.queue_new_entry(filename_new_queue, filename_orig_queue) {
             Ok(r) => r,
             Err(e) => {
@@ -602,7 +626,7 @@ where
         }
     }
 
-    fn queue_get(&mut self, filename: &CStr) -> bool {
+    fn queue_get(&mut self, filename: &Path) -> bool {
         match self.queue_get(filename) {
             Ok(r) => r,
             Err(e) => {
@@ -612,7 +636,7 @@ where
         }
     }
 
-    fn describe(&mut self, max_description: usize) -> Option<&CStr> {
+    fn describe(&mut self, max_description: usize) -> Option<&str> {
         match self.describe(max_description) {
             Ok(r) => r,
             Err(e) => {
@@ -622,7 +646,7 @@ where
         }
     }
 
-    fn introspection(&mut self) -> Option<&CStr> {
+    fn introspection(&mut self) -> Option<&str> {
         match self.introspection() {
             Ok(r) => r,
             Err(e) => {
@@ -632,3 +656,85 @@ where
         }
     }
 }
+
+/// the default value to return from [`CustomMutator::describe`].
+fn default_mutator_describe<T: ?Sized>(max_len: usize) -> &'static str {
+    truncate_str_unicode_safe(std::any::type_name::<T>(), max_len)
+}
+
+#[cfg(all(test, not(feature = "afl_internals")))]
+mod default_mutator_describe {
+    struct MyMutator;
+    use super::CustomMutator;
+    impl CustomMutator for MyMutator {
+        type Error = ();
+
+        fn init(_: u32) -> Result<Self, Self::Error> {
+            Ok(Self)
+        }
+
+        fn fuzz<'b, 's: 'b>(
+            &'s mut self,
+            _: &'b mut [u8],
+            _: Option<&[u8]>,
+            _: usize,
+        ) -> Result<Option<&'b [u8]>, Self::Error> {
+            unimplemented!()
+        }
+    }
+
+    #[test]
+    fn test_default_describe() {
+        assert_eq!(
+            MyMutator::init(0).unwrap().describe(64).unwrap().unwrap(),
+            "custom_mutator::default_mutator_describe::MyMutator"
+        );
+    }
+}
+
+/// little helper function to truncate a `str` to a maximum of bytes while retaining unicode safety
+fn truncate_str_unicode_safe(s: &str, max_len: usize) -> &str {
+    if s.len() <= max_len {
+        s
+    } else {
+        if let Some((last_index, _)) = s
+            .char_indices()
+            .take_while(|(index, _)| *index <= max_len)
+            .last()
+        {
+            &s[..last_index]
+        } else {
+            ""
+        }
+    }
+}
+
+#[cfg(test)]
+mod truncate_test {
+    use super::truncate_str_unicode_safe;
+
+    #[test]
+    fn test_truncate() {
+        for (max_len, input, expected_output) in &[
+            (0usize, "a", ""),
+            (1, "a", "a"),
+            (1, "ä", ""),
+            (2, "ä", "ä"),
+            (3, "äa", "äa"),
+            (4, "äa", "äa"),
+            (1, "👎", ""),
+            (2, "👎", ""),
+            (3, "👎", ""),
+            (4, "👎", "👎"),
+            (1, "abc", "a"),
+            (2, "abc", "ab"),
+        ] {
+            let actual_output = truncate_str_unicode_safe(input, *max_len);
+            assert_eq!(
+                &actual_output, expected_output,
+                "{:#?} truncated to {} bytes should be {:#?}, but is {:#?}",
+                input, max_len, expected_output, actual_output
+            );
+        }
+    }
+}
diff --git a/custom_mutators/rust/example/src/example_mutator.rs b/custom_mutators/rust/example/src/example_mutator.rs
index 9b9d4997..c4711dd1 100644
--- a/custom_mutators/rust/example/src/example_mutator.rs
+++ b/custom_mutators/rust/example/src/example_mutator.rs
@@ -1,3 +1,4 @@
+#![cfg(unix)]
 #![allow(unused_variables)]
 
 use custom_mutator::{export_mutator, CustomMutator};
diff --git a/custom_mutators/rust/example_lain/src/lain_mutator.rs b/custom_mutators/rust/example_lain/src/lain_mutator.rs
index 22e5fe73..7099aeae 100644
--- a/custom_mutators/rust/example_lain/src/lain_mutator.rs
+++ b/custom_mutators/rust/example_lain/src/lain_mutator.rs
@@ -1,3 +1,5 @@
+#![cfg(unix)]
+
 use custom_mutator::{export_mutator, CustomMutator};
 use lain::{
     mutator::Mutator,
-- 
cgit 1.4.1