diff options
Diffstat (limited to 'llvm_mode/afl-clang-fast.c')
| -rw-r--r-- | llvm_mode/afl-clang-fast.c | 1143 |
1 files changed, 0 insertions, 1143 deletions
diff --git a/llvm_mode/afl-clang-fast.c b/llvm_mode/afl-clang-fast.c deleted file mode 100644 index ccdbca9d..00000000 --- a/llvm_mode/afl-clang-fast.c +++ /dev/null @@ -1,1143 +0,0 @@ -/* - american fuzzy lop++ - LLVM-mode wrapper for clang - ------------------------------------------------ - - Written by Laszlo Szekeres <lszekeres@google.com> and - Michal Zalewski - - LLVM integration design comes from Laszlo Szekeres. - - Copyright 2015, 2016 Google Inc. 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 program is a drop-in replacement for clang, similar in most respects - to ../afl-gcc. It tries to figure out compilation mode, adds a bunch - of flags, and then calls the real compiler. - - */ - -#define AFL_MAIN - -#include "common.h" -#include "config.h" -#include "types.h" -#include "debug.h" -#include "alloc-inl.h" -#include "llvm-ngram-coverage.h" - -#include <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <string.h> -#include <strings.h> -#include <limits.h> -#include <assert.h> - -#include "llvm/Config/llvm-config.h" - -static u8 * obj_path; /* Path to runtime libraries */ -static u8 **cc_params; /* Parameters passed to the real CC */ -static u32 cc_par_cnt = 1; /* Param count, including argv0 */ -static u8 llvm_fullpath[PATH_MAX]; -static u8 instrument_mode, instrument_opt_mode, ngram_size, lto_mode, cpp_mode; -static u8 *lto_flag = AFL_CLANG_FLTO; -static u8 debug; -static u8 cwd[4096]; -static u8 cmplog_mode; -u8 use_stdin = 0; /* dummy */ -// static u8 *march_opt = CFLAGS_OPT; - -enum { - - INSTURMENT_DEFAULT = 0, - INSTRUMENT_CLASSIC = 1, - INSTRUMENT_AFL = 1, - INSTRUMENT_PCGUARD = 2, - INSTRUMENT_INSTRIM = 3, - INSTRUMENT_CFG = 3, - INSTRUMENT_LTO = 4, - INSTRUMENT_OPT_CTX = 8, - INSTRUMENT_OPT_NGRAM = 16 - -}; - -char instrument_mode_string[18][18] = { - - "DEFAULT", "CLASSIC", "PCGUARD", "CFG", "LTO", "", "", "", "CTX", "", - "", "", "", "", "", "", "NGRAM", "" - -}; - -u8 *getthecwd() { - - static u8 fail[] = ""; - if (getcwd(cwd, sizeof(cwd)) == NULL) return fail; - return cwd; - -} - -/* Try to find the runtime libraries. If that fails, abort. */ - -static void find_obj(u8 *argv0) { - - u8 *afl_path = getenv("AFL_PATH"); - u8 *slash, *tmp; - - if (afl_path) { - -#ifdef __ANDROID__ - tmp = alloc_printf("%s/afl-llvm-rt.so", afl_path); -#else - tmp = alloc_printf("%s/afl-llvm-rt.o", afl_path); -#endif - - if (!access(tmp, R_OK)) { - - obj_path = afl_path; - ck_free(tmp); - return; - - } - - ck_free(tmp); - - } - - slash = strrchr(argv0, '/'); - - if (slash) { - - u8 *dir; - - *slash = 0; - dir = ck_strdup(argv0); - *slash = '/'; - -#ifdef __ANDROID__ - tmp = alloc_printf("%s/afl-llvm-rt.so", dir); -#else - tmp = alloc_printf("%s/afl-llvm-rt.o", dir); -#endif - - if (!access(tmp, R_OK)) { - - obj_path = dir; - ck_free(tmp); - return; - - } - - ck_free(tmp); - ck_free(dir); - - } - -#ifdef __ANDROID__ - if (!access(AFL_PATH "/afl-llvm-rt.so", R_OK)) { - -#else - if (!access(AFL_PATH "/afl-llvm-rt.o", R_OK)) { - -#endif - - obj_path = AFL_PATH; - return; - - } - - FATAL( - "Unable to find 'afl-llvm-rt.o' or 'afl-llvm-pass.so'. Please set " - "AFL_PATH"); - -} - -/* Copy argv to cc_params, making the necessary edits. */ - -static void edit_params(u32 argc, char **argv, char **envp) { - - u8 fortify_set = 0, asan_set = 0, x_set = 0, bit_mode = 0, shared_linking = 0, - preprocessor_only = 0; - u8 have_pic = 0; - u8 *name; - - cc_params = ck_alloc((argc + 128) * sizeof(u8 *)); - - name = strrchr(argv[0], '/'); - if (!name) - name = argv[0]; - else - ++name; - - if (lto_mode) - if (lto_flag[0] != '-') - FATAL( - "Using afl-clang-lto is not possible because Makefile magic did not " - "identify the correct -flto flag"); - - if (!strcmp(name, "afl-clang-fast++") || !strcmp(name, "afl-clang-lto++") || - !strcmp(name, "afl-clang++")) { - - u8 *alt_cxx = getenv("AFL_CXX"); - if (USE_BINDIR) - snprintf(llvm_fullpath, sizeof(llvm_fullpath), "%s/clang++", LLVM_BINDIR); - else - sprintf(llvm_fullpath, CLANGPP_BIN); - cc_params[0] = alt_cxx && *alt_cxx ? alt_cxx : (u8 *)llvm_fullpath; - cpp_mode = 1; - - } else if (!strcmp(name, "afl-clang-fast") || - - !strcmp(name, "afl-clang-lto") || !strcmp(name, "afl-clang")) { - - u8 *alt_cc = getenv("AFL_CC"); - if (USE_BINDIR) - snprintf(llvm_fullpath, sizeof(llvm_fullpath), "%s/clang", LLVM_BINDIR); - else - sprintf(llvm_fullpath, CLANG_BIN); - cc_params[0] = alt_cc && *alt_cc ? alt_cc : (u8 *)llvm_fullpath; - - } else { - - fprintf(stderr, "Name of the binary: %s\n", argv[0]); - FATAL( - "Name of the binary is not a known name, expected afl-clang-fast(++) " - "or afl-clang-lto(++)"); - - } - - cc_params[cc_par_cnt++] = "-Wno-unused-command-line-argument"; - - if (lto_mode && cpp_mode) - cc_params[cc_par_cnt++] = "-lc++"; // needed by fuzzbench, early - - /* There are several ways to compile with afl-clang-fast. In the traditional - mode, we use afl-llvm-pass.so, then there is libLLVMInsTrim.so which is - faster and creates less map pollution. - Then there is the 'trace-pc-guard' mode, we use native LLVM - instrumentation callbacks instead. For trace-pc-guard see: - http://clang.llvm.org/docs/SanitizerCoverage.html#tracing-pcs-with-guards - The best instrumentatation is with the LTO modes, the classic and - InsTrimLTO, the latter is faster. The LTO modes are activated by using - afl-clang-lto(++) - */ - - if (lto_mode) { - - if (getenv("AFL_LLVM_INSTRUMENT_FILE") != NULL || - getenv("AFL_LLVM_WHITELIST") || getenv("AFL_LLVM_ALLOWLIST") || - getenv("AFL_LLVM_DENYLIST") || getenv("AFL_LLVM_BLOCKLIST")) { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/afl-llvm-lto-instrumentlist.so", obj_path); - - } - - } - - // laf - if (getenv("LAF_SPLIT_SWITCHES") || getenv("AFL_LLVM_LAF_SPLIT_SWITCHES")) { - - if (lto_mode) { - - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,-mllvm=-load=%s/split-switches-pass.so", obj_path); - - } else { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/split-switches-pass.so", obj_path); - - } - - } - - if (getenv("LAF_TRANSFORM_COMPARES") || - getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES")) { - - if (lto_mode) { - - cc_params[cc_par_cnt++] = alloc_printf( - "-Wl,-mllvm=-load=%s/compare-transform-pass.so", obj_path); - - } else { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/compare-transform-pass.so", obj_path); - - } - - } - - if (getenv("LAF_SPLIT_COMPARES") || getenv("AFL_LLVM_LAF_SPLIT_COMPARES") || - getenv("AFL_LLVM_LAF_SPLIT_FLOATS")) { - - if (lto_mode) { - - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,-mllvm=-load=%s/split-compares-pass.so", obj_path); - - } else { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/split-compares-pass.so", obj_path); - - } - - } - - // /laf - - unsetenv("AFL_LD"); - unsetenv("AFL_LD_CALLER"); - if (cmplog_mode) { - - if (lto_mode) { - - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,-mllvm=-load=%s/cmplog-routines-pass.so", obj_path); - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,-mllvm=-load=%s/split-switches-pass.so", obj_path); - cc_params[cc_par_cnt++] = alloc_printf( - "-Wl,-mllvm=-load=%s/cmplog-instructions-pass.so", obj_path); - - } else { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/cmplog-routines-pass.so", obj_path); - - // reuse split switches from laf - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/split-switches-pass.so", obj_path); - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = - alloc_printf("%s/cmplog-instructions-pass.so", obj_path); - - } - - cc_params[cc_par_cnt++] = "-fno-inline"; - - } - - if (lto_mode) { - -#if defined(AFL_CLANG_LDPATH) && LLVM_VERSION_MAJOR >= 12 - u8 *ld_ptr = strrchr(AFL_REAL_LD, '/'); - if (!ld_ptr) ld_ptr = "ld.lld"; - cc_params[cc_par_cnt++] = alloc_printf("-fuse-ld=%s", ld_ptr); - cc_params[cc_par_cnt++] = alloc_printf("--ld-path=%s", AFL_REAL_LD); -#else - cc_params[cc_par_cnt++] = alloc_printf("-fuse-ld=%s", AFL_REAL_LD); -#endif - - cc_params[cc_par_cnt++] = "-Wl,--allow-multiple-definition"; - - if (instrument_mode == INSTRUMENT_CFG) - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,-mllvm=-load=%s/SanitizerCoverageLTO.so", obj_path); - else - - cc_params[cc_par_cnt++] = alloc_printf( - "-Wl,-mllvm=-load=%s/afl-llvm-lto-instrumentation.so", obj_path); - cc_params[cc_par_cnt++] = lto_flag; - - } else { - - if (instrument_mode == INSTRUMENT_PCGUARD) { - -#if LLVM_VERSION_MAJOR > 4 || \ - (LLVM_VERSION_MAJOR == 4 && \ - (LLVM_VERSION_MINOR > 0 || LLVM_VERSION_PATCH >= 1)) - cc_params[cc_par_cnt++] = - "-fsanitize-coverage=trace-pc-guard"; // edge coverage by default -#else - FATAL("pcguard instrumentation requires llvm 4.0.1+"); -#endif - - } else { - - cc_params[cc_par_cnt++] = "-Xclang"; - cc_params[cc_par_cnt++] = "-load"; - cc_params[cc_par_cnt++] = "-Xclang"; - if (instrument_mode == INSTRUMENT_CFG) - cc_params[cc_par_cnt++] = - alloc_printf("%s/libLLVMInsTrim.so", obj_path); - else - cc_params[cc_par_cnt++] = alloc_printf("%s/afl-llvm-pass.so", obj_path); - - } - - } - - // cc_params[cc_par_cnt++] = "-Qunused-arguments"; - - // in case LLVM is installed not via a package manager or "make install" - // e.g. compiled download or compiled from github then it's ./lib directory - // might not be in the search path. Add it if so. - u8 *libdir = strdup(LLVM_LIBDIR); - if (cpp_mode && strlen(libdir) && strncmp(libdir, "/usr", 4) && - strncmp(libdir, "/lib", 4)) { - - cc_params[cc_par_cnt++] = "-rpath"; - cc_params[cc_par_cnt++] = libdir; - - } else { - - free(libdir); - - } - - u32 idx; - if (lto_mode && argc > 1) { - - for (idx = 1; idx < argc; idx++) { - - if (!strncasecmp(argv[idx], "-fpic", 5)) have_pic = 1; - - } - - if (!have_pic) cc_params[cc_par_cnt++] = "-fPIC"; - - } - - /* Detect stray -v calls from ./configure scripts. */ - - while (--argc) { - - u8 *cur = *(++argv); - - if (!strcmp(cur, "-m32")) bit_mode = 32; - if (!strcmp(cur, "armv7a-linux-androideabi")) bit_mode = 32; - if (!strcmp(cur, "-m64")) bit_mode = 64; - - if (!strcmp(cur, "-x")) x_set = 1; - - if (!strcmp(cur, "-fsanitize=address") || !strcmp(cur, "-fsanitize=memory")) - asan_set = 1; - - if (strstr(cur, "FORTIFY_SOURCE")) fortify_set = 1; - - if (!strcmp(cur, "-Wl,-z,defs") || !strcmp(cur, "-Wl,--no-undefined")) - continue; - - if (lto_mode && !strncmp(cur, "-fuse-ld=", 9)) continue; - if (lto_mode && !strncmp(cur, "--ld-path=", 10)) continue; - - if (!strcmp(cur, "-E")) preprocessor_only = 1; - if (!strcmp(cur, "-shared")) shared_linking = 1; - - cc_params[cc_par_cnt++] = cur; - - } - - if (getenv("AFL_HARDEN")) { - - cc_params[cc_par_cnt++] = "-fstack-protector-all"; - - if (!fortify_set) cc_params[cc_par_cnt++] = "-D_FORTIFY_SOURCE=2"; - - } - - if (!asan_set) { - - if (getenv("AFL_USE_ASAN")) { - - if (getenv("AFL_USE_MSAN")) FATAL("ASAN and MSAN are mutually exclusive"); - - if (getenv("AFL_HARDEN")) - FATAL("ASAN and AFL_HARDEN are mutually exclusive"); - - cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE"; - cc_params[cc_par_cnt++] = "-fsanitize=address"; - - } else if (getenv("AFL_USE_MSAN")) { - - if (getenv("AFL_USE_ASAN")) FATAL("ASAN and MSAN are mutually exclusive"); - - if (getenv("AFL_HARDEN")) - FATAL("MSAN and AFL_HARDEN are mutually exclusive"); - - cc_params[cc_par_cnt++] = "-U_FORTIFY_SOURCE"; - cc_params[cc_par_cnt++] = "-fsanitize=memory"; - - } - - } - - if (getenv("AFL_USE_UBSAN")) { - - cc_params[cc_par_cnt++] = "-fsanitize=undefined"; - cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error"; - cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all"; - - } - - if (getenv("AFL_USE_CFISAN")) { - - if (!lto_mode) { - - uint32_t i = 0, found = 0; - while (envp[i] != NULL && !found) - if (strncmp("-flto", envp[i++], 5) == 0) found = 1; - if (!found) cc_params[cc_par_cnt++] = "-flto"; - - } - - cc_params[cc_par_cnt++] = "-fsanitize=cfi"; - cc_params[cc_par_cnt++] = "-fvisibility=hidden"; - - } - - if (!getenv("AFL_DONT_OPTIMIZE")) { - - cc_params[cc_par_cnt++] = "-g"; - cc_params[cc_par_cnt++] = "-O3"; - cc_params[cc_par_cnt++] = "-funroll-loops"; - // if (strlen(march_opt) > 1 && march_opt[0] == '-') - // cc_params[cc_par_cnt++] = march_opt; - - } - - if (getenv("AFL_NO_BUILTIN") || getenv("AFL_LLVM_LAF_TRANSFORM_COMPARES") || - getenv("LAF_TRANSFORM_COMPARES") || lto_mode) { - - cc_params[cc_par_cnt++] = "-fno-builtin-strcmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-strncmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-strcasecmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-strncasecmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-memcmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-bcmp"; - cc_params[cc_par_cnt++] = "-fno-builtin-strstr"; - cc_params[cc_par_cnt++] = "-fno-builtin-strcasestr"; - - } - -#if defined(USEMMAP) && !defined(__HAIKU__) - cc_params[cc_par_cnt++] = "-lrt"; -#endif - - cc_params[cc_par_cnt++] = "-D__AFL_HAVE_MANUAL_CONTROL=1"; - cc_params[cc_par_cnt++] = "-D__AFL_COMPILER=1"; - cc_params[cc_par_cnt++] = "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1"; - - /* When the user tries to use persistent or deferred forkserver modes by - appending a single line to the program, we want to reliably inject a - signature into the binary (to be picked up by afl-fuzz) and we want - to call a function from the runtime .o file. This is unnecessarily - painful for three reasons: - - 1) We need to convince the compiler not to optimize out the signature. - This is done with __attribute__((used)). - - 2) We need to convince the linker, when called with -Wl,--gc-sections, - not to do the same. This is done by forcing an assignment to a - 'volatile' pointer. - - 3) We need to declare __afl_persistent_loop() in the global namespace, - but doing this within a method in a class is hard - :: and extern "C" - are forbidden and __attribute__((alias(...))) doesn't work. Hence the - __asm__ aliasing trick. - - */ - - cc_params[cc_par_cnt++] = - "-D__AFL_FUZZ_INIT()=" - "int __afl_sharedmem_fuzzing = 1;" - "extern unsigned int *__afl_fuzz_len;" - "extern unsigned char *__afl_fuzz_ptr;" - "unsigned char __afl_fuzz_alt[1024000];" - "unsigned char *__afl_fuzz_alt_ptr = __afl_fuzz_alt;"; - cc_params[cc_par_cnt++] = - "-D__AFL_FUZZ_TESTCASE_BUF=(__afl_fuzz_ptr ? __afl_fuzz_ptr : " - "__afl_fuzz_alt_ptr)"; - cc_params[cc_par_cnt++] = - "-D__AFL_FUZZ_TESTCASE_LEN=(__afl_fuzz_ptr ? *__afl_fuzz_len : " - "(*__afl_fuzz_len = read(0, __afl_fuzz_alt_ptr, 1024000)) == 0xffffffff " - "? 0 : *__afl_fuzz_len)"; - - cc_params[cc_par_cnt++] = - "-D__AFL_LOOP(_A)=" - "({ static volatile char *_B __attribute__((used)); " - " _B = (char*)\"" PERSIST_SIG - "\"; " -#ifdef __APPLE__ - "__attribute__((visibility(\"default\"))) " - "int _L(unsigned int) __asm__(\"___afl_persistent_loop\"); " -#else - "__attribute__((visibility(\"default\"))) " - "int _L(unsigned int) __asm__(\"__afl_persistent_loop\"); " -#endif /* ^__APPLE__ */ - "_L(_A); })"; - - cc_params[cc_par_cnt++] = - "-D__AFL_INIT()=" - "do { static volatile char *_A __attribute__((used)); " - " _A = (char*)\"" DEFER_SIG - "\"; " -#ifdef __APPLE__ - "__attribute__((visibility(\"default\"))) " - "void _I(void) __asm__(\"___afl_manual_init\"); " -#else - "__attribute__((visibility(\"default\"))) " - "void _I(void) __asm__(\"__afl_manual_init\"); " -#endif /* ^__APPLE__ */ - "_I(); } while (0)"; - - if (x_set) { - - cc_params[cc_par_cnt++] = "-x"; - cc_params[cc_par_cnt++] = "none"; - - } - - if (preprocessor_only) { - - /* In the preprocessor_only case (-E), we are not actually compiling at - all but requesting the compiler to output preprocessed sources only. - We must not add the runtime in this case because the compiler will - simply output its binary content back on stdout, breaking any build - systems that rely on a separate source preprocessing step. */ - cc_params[cc_par_cnt] = NULL; - return; - - } - -#ifndef __ANDROID__ - switch (bit_mode) { - - case 0: - cc_params[cc_par_cnt++] = alloc_printf("%s/afl-llvm-rt.o", obj_path); - if (lto_mode) - cc_params[cc_par_cnt++] = - alloc_printf("%s/afl-llvm-rt-lto.o", obj_path); - break; - - case 32: - cc_params[cc_par_cnt++] = alloc_printf("%s/afl-llvm-rt-32.o", obj_path); - if (access(cc_params[cc_par_cnt - 1], R_OK)) - FATAL("-m32 is not supported by your compiler"); - if (lto_mode) { - - cc_params[cc_par_cnt++] = - alloc_printf("%s/afl-llvm-rt-lto-32.o", obj_path); - if (access(cc_params[cc_par_cnt - 1], R_OK)) - FATAL("-m32 is not supported by your compiler"); - - } - - break; - - case 64: - cc_params[cc_par_cnt++] = alloc_printf("%s/afl-llvm-rt-64.o", obj_path); - if (access(cc_params[cc_par_cnt - 1], R_OK)) - FATAL("-m64 is not supported by your compiler"); - if (lto_mode) { - - cc_params[cc_par_cnt++] = - alloc_printf("%s/afl-llvm-rt-lto-64.o", obj_path); - if (access(cc_params[cc_par_cnt - 1], R_OK)) - FATAL("-m64 is not supported by your compiler"); - - } - - break; - - } - - #ifndef __APPLE__ - if (!shared_linking) - cc_params[cc_par_cnt++] = - alloc_printf("-Wl,--dynamic-list=%s/dynamic_list.txt", obj_path); - #endif - -#endif - - cc_params[cc_par_cnt] = NULL; - -} - -/* Main entry point */ - -int main(int argc, char **argv, char **envp) { - - int i; - char *callname = "afl-clang-fast", *ptr = NULL; - - if (getenv("AFL_DEBUG")) { - - debug = 1; - if (strcmp(getenv("AFL_DEBUG"), "0") == 0) unsetenv("AFL_DEBUG"); - - } else if (getenv("AFL_QUIET")) - - be_quiet = 1; - - if (getenv("USE_TRACE_PC") || getenv("AFL_USE_TRACE_PC") || - getenv("AFL_LLVM_USE_TRACE_PC") || getenv("AFL_TRACE_PC")) { - - if (instrument_mode == 0) - instrument_mode = INSTRUMENT_PCGUARD; - else if (instrument_mode != INSTRUMENT_PCGUARD) - FATAL("you can not set AFL_LLVM_INSTRUMENT and AFL_TRACE_PC together"); - - } - - if ((getenv("AFL_LLVM_INSTRUMENT_FILE") != NULL || - getenv("AFL_LLVM_WHITELIST") || getenv("AFL_LLVM_ALLOWLIST") || - getenv("AFL_LLVM_DENYLIST") || getenv("AFL_LLVM_BLOCKLIST")) && - getenv("AFL_DONT_OPTIMIZE")) - WARNF( - "AFL_LLVM_ALLOWLIST/DENYLIST and AFL_DONT_OPTIMIZE cannot be combined " - "for file matching, only function matching!"); - - if (getenv("AFL_LLVM_INSTRIM") || getenv("INSTRIM") || - getenv("INSTRIM_LIB")) { - - if (instrument_mode == 0) - instrument_mode = INSTRUMENT_CFG; - else if (instrument_mode != INSTRUMENT_CFG) - FATAL( - "you can not set AFL_LLVM_INSTRUMENT and AFL_LLVM_INSTRIM together"); - - } - - if (getenv("AFL_LLVM_CTX")) instrument_opt_mode |= INSTRUMENT_OPT_CTX; - - if (getenv("AFL_LLVM_NGRAM_SIZE")) { - - instrument_opt_mode |= INSTRUMENT_OPT_NGRAM; - ngram_size = atoi(getenv("AFL_LLVM_NGRAM_SIZE")); - if (ngram_size < 2 || ngram_size > NGRAM_SIZE_MAX) - FATAL( - "NGRAM instrumentation mode must be between 2 and NGRAM_SIZE_MAX " - "(%u)", - NGRAM_SIZE_MAX); - - } - - if (getenv("AFL_LLVM_INSTRUMENT")) { - - u8 *ptr = strtok(getenv("AFL_LLVM_INSTRUMENT"), ":,;"); - - while (ptr) { - - if (strncasecmp(ptr, "afl", strlen("afl")) == 0 || - strncasecmp(ptr, "classic", strlen("classic")) == 0) { - - if (instrument_mode == INSTRUMENT_LTO) { - - instrument_mode = INSTRUMENT_CLASSIC; - lto_mode = 1; - - } else if (!instrument_mode || instrument_mode == INSTRUMENT_AFL) - - instrument_mode = INSTRUMENT_AFL; - else - FATAL("main instrumentation mode already set with %s", - instrument_mode_string[instrument_mode]); - - } - - if (strncasecmp(ptr, "pc-guard", strlen("pc-guard")) == 0 || - strncasecmp(ptr, "pcguard", strlen("pcguard")) == 0) { - - if (!instrument_mode || instrument_mode == INSTRUMENT_PCGUARD) - instrument_mode = INSTRUMENT_PCGUARD; - else - FATAL("main instrumentation mode already set with %s", - instrument_mode_string[instrument_mode]); - - } - - if (strncasecmp(ptr, "cfg", strlen("cfg")) == 0 || - strncasecmp(ptr, "instrim", strlen("instrim")) == 0) { - - if (instrument_mode == INSTRUMENT_LTO) { - - instrument_mode = INSTRUMENT_CFG; - lto_mode = 1; - - } else if (!instrument_mode || instrument_mode == INSTRUMENT_CFG) - - instrument_mode = INSTRUMENT_CFG; - else - FATAL("main instrumentation mode already set with %s", - instrument_mode_string[instrument_mode]); - - } - - if (strncasecmp(ptr, "lto", strlen("lto")) == 0) { - - lto_mode = 1; - if (!instrument_mode || instrument_mode == INSTRUMENT_LTO) - instrument_mode = INSTRUMENT_LTO; - else if (instrument_mode != INSTRUMENT_CFG) - FATAL("main instrumentation mode already set with %s", - instrument_mode_string[instrument_mode]); - - } - - if (strncasecmp(ptr, "ctx", strlen("ctx")) == 0) { - - instrument_opt_mode |= INSTRUMENT_OPT_CTX; - setenv("AFL_LLVM_CTX", "1", 1); - - } - - if (strncasecmp(ptr, "ngram", strlen("ngram")) == 0) { - - ptr += strlen("ngram"); - while (*ptr && (*ptr < '0' || *ptr > '9')) { - - ptr++; - - } - - if (!*ptr) { - - ptr = getenv("AFL_LLVM_NGRAM_SIZE"); - if (!ptr || !*ptr) { - - FATAL( - "you must set the NGRAM size with (e.g. for value 2) " - "AFL_LLVM_INSTRUMENT=ngram-2"); - - } - - } - - ngram_size = atoi(ptr); - if (ngram_size < 2 || ngram_size > NGRAM_SIZE_MAX) - FATAL( - "NGRAM instrumentation option must be between 2 and " - "NGRAM_SIZE_MAX " - "(%u)", - NGRAM_SIZE_MAX); - instrument_opt_mode |= (INSTRUMENT_OPT_NGRAM); - ptr = alloc_printf("%u", ngram_size); - setenv("AFL_LLVM_NGRAM_SIZE", ptr, 1); - - } - - ptr = strtok(NULL, ":,;"); - - } - - } - - if (strstr(argv[0], "afl-clang-lto") != NULL) { - - if (instrument_mode == 0 || instrument_mode == INSTRUMENT_LTO || - instrument_mode == INSTRUMENT_CFG) { - - lto_mode = 1; - callname = "afl-clang-lto"; - if (!instrument_mode) { - - instrument_mode = INSTRUMENT_CFG; - ptr = instrument_mode_string[instrument_mode]; - - } - - } else if (instrument_mode == INSTRUMENT_LTO || - - instrument_mode == INSTRUMENT_CLASSIC) { - - lto_mode = 1; - callname = "afl-clang-lto"; - - } else { - - if (!be_quiet) - WARNF("afl-clang-lto called with mode %s, using that mode instead", - instrument_mode_string[instrument_mode]); - - } - - } - - if (instrument_mode == 0) { - -#if LLVM_VERSION_MAJOR <= 6 - instrument_mode = INSTRUMENT_AFL; -#else - if (getenv("AFL_LLVM_INSTRUMENT_FILE") != NULL || - getenv("AFL_LLVM_WHITELIST") || getenv("AFL_LLVM_ALLOWLIST") || - getenv("AFL_LLVM_DENYLIST") || getenv("AFL_LLVM_BLOCKLIST")) { - - instrument_mode = INSTRUMENT_AFL; - WARNF( - "switching to classic instrumentation because " - "AFL_LLVM_ALLOWLIST/DENYLIST does not work with PCGUARD. Use " - "-fsanitize-coverage-allowlist=allowlist.txt or " - "-fsanitize-coverage-blocklist=denylist.txt if you want to use " - "PCGUARD. Requires llvm 12+. See https://clang.llvm.org/docs/ " - "SanitizerCoverage.html#partially-disabling-instrumentation"); - - } else - - instrument_mode = INSTRUMENT_PCGUARD; -#endif - - } - - if (instrument_opt_mode && lto_mode) - FATAL( - "CTX and NGRAM can not be used in LTO mode (and would make LTO " - "useless)"); - - if (!instrument_opt_mode) { - - if (lto_mode && instrument_mode == INSTRUMENT_CFG) - ptr = alloc_printf("InsTrimLTO"); - else - ptr = instrument_mode_string[instrument_mode]; - - } else if (instrument_opt_mode == INSTRUMENT_OPT_CTX) - - ptr = alloc_printf("%s + CTX", instrument_mode_string[instrument_mode]); - else if (instrument_opt_mode == INSTRUMENT_OPT_NGRAM) - ptr = alloc_printf("%s + NGRAM-%u", instrument_mode_string[instrument_mode], - ngram_size); - else - ptr = alloc_printf("%s + CTX + NGRAM-%u", - instrument_mode_string[instrument_mode], ngram_size); - -#ifndef AFL_CLANG_FLTO - if (lto_mode) - FATAL( - "instrumentation mode LTO specified but LLVM support not available " - "(requires LLVM 11 or higher)"); -#endif - - if (instrument_opt_mode && instrument_mode != INSTRUMENT_CLASSIC && - instrument_mode != INSTRUMENT_CFG) - FATAL( - "CTX and NGRAM instrumentation options can only be used with CFG " - "(recommended) and CLASSIC instrumentation modes!"); - - if (getenv("AFL_LLVM_SKIP_NEVERZERO") && getenv("AFL_LLVM_NOT_ZERO")) - FATAL( - "AFL_LLVM_NOT_ZERO and AFL_LLVM_SKIP_NEVERZERO can not be set " - "together"); - - if (instrument_mode == INSTRUMENT_PCGUARD && - (getenv("AFL_LLVM_INSTRUMENT_FILE") != NULL || - getenv("AFL_LLVM_WHITELIST") || getenv("AFL_LLVM_ALLOWLIST") || - getenv("AFL_LLVM_DENYLIST") || getenv("AFL_LLVM_BLOCKLIST"))) - FATAL( - "Instrumentation type PCGUARD does not support " - "AFL_LLVM_ALLOWLIST/DENYLIST! Use " - "-fsanitize-coverage-allowlist=allowlist.txt or " - "-fsanitize-coverage-blocklist=denylist.txt instead (requires llvm " - "12+), see " - "https://clang.llvm.org/docs/" - "SanitizerCoverage.html#partially-disabling-instrumentation"); - - if (argc < 2 || strcmp(argv[1], "-h") == 0) { - - if (!lto_mode) - printf("afl-clang-fast" VERSION " by <lszekeres@google.com> in %s mode\n", - ptr); - else - printf("afl-clang-lto" VERSION - " by Marc \"vanHauser\" Heuse <mh@mh-sec.de> in %s mode\n", - ptr); - - SAYF( - "\n" - "%s[++] [options]\n" - "\n" - "This is a helper application for afl-fuzz. It serves as a drop-in " - "replacement\n" - "for clang, letting you recompile third-party code with the " - "required " - "runtime\n" - "instrumentation. A common use pattern would be one of the " - "following:\n\n" - - " CC=%s/afl-clang-fast ./configure\n" - " CXX=%s/afl-clang-fast++ ./configure\n\n" - - "In contrast to the traditional afl-clang tool, this version is " - "implemented as\n" - "an LLVM pass and tends to offer improved performance with slow " - "programs.\n\n" - - "Environment variables used:\n" - "AFL_CC: path to the C compiler to use\n" - "AFL_CXX: path to the C++ compiler to use\n" - "AFL_DEBUG: enable developer debugging output\n" - "AFL_DONT_OPTIMIZE: disable optimization instead of -O3\n" - "AFL_HARDEN: adds code hardening to catch memory bugs\n" - "AFL_INST_RATIO: percentage of branches to instrument\n" -#if LLVM_VERSION_MAJOR < 9 - "AFL_LLVM_NOT_ZERO: use cycling trace counters that skip zero\n" -#else - "AFL_LLVM_SKIP_NEVERZERO: do not skip zero on trace counters\n" -#endif - "AFL_LLVM_LAF_SPLIT_COMPARES: enable cascaded comparisons\n" - "AFL_LLVM_LAF_SPLIT_COMPARES_BITW: size limit (default 8)\n" - "AFL_LLVM_LAF_SPLIT_SWITCHES: casc. comp. in 'switch'\n" - " to cascaded comparisons\n" - "AFL_LLVM_LAF_SPLIT_FLOATS: transform floating point comp. to " - "cascaded comp.\n" - "AFL_LLVM_LAF_TRANSFORM_COMPARES: transform library comparison " - "function calls\n" - "AFL_LLVM_LAF_ALL: enables all LAF splits/transforms\n" - "AFL_LLVM_INSTRUMENT_ALLOW/AFL_LLVM_INSTRUMENT_DENY: enable instrument" - "allow/deny listing (selective instrumentation)\n" - "AFL_NO_BUILTIN: compile for use with libtokencap.so\n" - "AFL_PATH: path to instrumenting pass and runtime " - "(afl-llvm-rt.*o)\n" - "AFL_LLVM_DOCUMENT_IDS: document edge IDs given to which function (LTO " - "only)\n" - "AFL_QUIET: suppress verbose output\n" - "AFL_USE_ASAN: activate address sanitizer\n" - "AFL_USE_CFISAN: activate control flow sanitizer\n" - "AFL_USE_MSAN: activate memory sanitizer\n" - "AFL_USE_UBSAN: activate undefined behaviour sanitizer\n", - callname, BIN_PATH, BIN_PATH); - - SAYF( - "\nafl-clang-fast specific environment variables:\n" - "AFL_LLVM_CMPLOG: log operands of comparisons (RedQueen mutator)\n" - "AFL_LLVM_INSTRUMENT: set instrumentation mode: AFL, CFG " - "(INSTRIM), PCGUARD [DEFAULT], LTO, CTX, NGRAM-2 ... NGRAM-16\n" - " You can also use the old environment variables instead:\n" - " AFL_LLVM_USE_TRACE_PC: use LLVM trace-pc-guard instrumentation " - "[DEFAULT]\n" - " AFL_LLVM_INSTRIM: use light weight instrumentation InsTrim\n" - " AFL_LLVM_INSTRIM_LOOPHEAD: optimize loop tracing for speed (" - "option to INSTRIM)\n" - " AFL_LLVM_CTX: use context sensitive coverage\n" - " AFL_LLVM_NGRAM_SIZE: use ngram prev_loc count coverage\n"); - -#ifdef AFL_CLANG_FLTO - SAYF( - "\nafl-clang-lto specific environment variables:\n" - "AFL_LLVM_MAP_ADDR: use a fixed coverage map address (speed), e.g. " - "0x10000\n" - "AFL_LLVM_DOCUMENT_IDS: write all edge IDs and the corresponding " - "functions they are in into this file\n" - "AFL_LLVM_LTO_DONTWRITEID: don't write the highest ID used to a " - "global var\n" - "AFL_LLVM_LTO_STARTID: from which ID to start counting from for a " - "bb\n" - "AFL_REAL_LD: use this lld linker instead of the compiled in path\n" - "\nafl-clang-lto was built with linker target \"%s\" and LTO flags " - "\"%s\"\n" - "If anything fails - be sure to read README.lto.md!\n", - AFL_REAL_LD, AFL_CLANG_FLTO); -#endif - - SAYF( - "\nafl-clang-fast was built for llvm %s with the llvm binary path " - "of \"%s\".\n", - LLVM_VERSION, LLVM_BINDIR); - - SAYF("\n"); - - exit(1); - - } else if ((isatty(2) && !be_quiet) || - - getenv("AFL_DEBUG") != NULL) { - - if (!lto_mode) - - SAYF(cCYA "afl-clang-fast" VERSION cRST - " by <lszekeres@google.com> in %s mode\n", - ptr); - - else - - SAYF(cCYA "afl-clang-lto" VERSION cRST - " by Marc \"vanHauser\" Heuse <mh@mh-sec.de> in mode %s\n", - ptr); - - } - - u8 *ptr2; - if (!be_quiet && !lto_mode && - ((ptr2 = getenv("AFL_MAP_SIZE")) || (ptr2 = getenv("AFL_MAPSIZE")))) { - - u32 map_size = atoi(ptr2); - if (map_size != MAP_SIZE) - WARNF("AFL_MAP_SIZE is not supported by afl-clang-fast"); - - } - - if (debug) { - - SAYF(cMGN "[D]" cRST " cd \"%s\";", getthecwd()); - for (i = 0; i < argc; i++) - SAYF(" \"%s\"", argv[i]); - SAYF("\n"); - - } - - check_environment_vars(envp); - - if (getenv("AFL_LLVM_LAF_ALL")) { - - setenv("AFL_LLVM_LAF_SPLIT_SWITCHES", "1", 1); - setenv("AFL_LLVM_LAF_SPLIT_COMPARES", "1", 1); - setenv("AFL_LLVM_LAF_SPLIT_FLOATS", "1", 1); - setenv("AFL_LLVM_LAF_TRANSFORM_COMPARES", "1", 1); - - } - - cmplog_mode = getenv("AFL_CMPLOG") || getenv("AFL_LLVM_CMPLOG"); - if (!be_quiet && cmplog_mode) - printf("CmpLog mode by <andreafioraldi@gmail.com>\n"); - -#ifndef __ANDROID__ - find_obj(argv[0]); -#endif - - edit_params(argc, argv, envp); - - if (debug) { - - SAYF(cMGN "[D]" cRST " cd \"%s\";", getthecwd()); - for (i = 0; i < cc_par_cnt; i++) - SAYF(" \"%s\"", cc_params[i]); - SAYF("\n"); - - } - - execvp(cc_params[0], (char **)cc_params); - - FATAL("Oops, failed to execute '%s' - check your PATH", cc_params[0]); - - return 0; - -} - |