Add `AFL_SHA1_FILENAMES` option

2 files changed, 37 insertions, 10 deletions

diff --git a/include/afl-fuzz.h b/include/afl-fuzz.h
index 1a958006..5efe5144 100644
--- a/include/afl-fuzz.h
+++ b/include/afl-fuzz.h
@@ -452,7 +452,8 @@ typedef struct afl_env_vars {
       afl_keep_timeouts, afl_no_crash_readme, afl_ignore_timeouts,
       afl_no_startup_calibration, afl_no_warn_instability,
       afl_post_process_keep_original, afl_crashing_seeds_as_new_crash,
-      afl_final_sync, afl_ignore_seed_problems, afl_disable_redundant;
+      afl_final_sync, afl_ignore_seed_problems, afl_disable_redundant,
+      afl_sha1_filenames;
 
   u8 *afl_tmpdir, *afl_custom_mutator_library, *afl_python_module, *afl_path,
       *afl_hang_tmout, *afl_forksrv_init_tmout, *afl_preload,
@@ -1404,6 +1405,32 @@ void queue_testcase_retake_mem(afl_state_t *afl, struct queue_entry *q, u8 *in,
 
 void queue_testcase_store_mem(afl_state_t *afl, struct queue_entry *q, u8 *mem);
 
+/* Compute the SHA1 hash of `data`, which is of `len` bytes, and return the
+ * result as a `\0`-terminated hex string, which the caller much `ck_free`. */
+char *sha1_hex(const u8 *data, size_t len);
+
+/* Apply `sha1_hex` to the first `len` bytes of data of the file at `fname`. */
+char *sha1_hex_for_file(const char *fname, u32 len);
+
+/* Create file `fn`, but allow it to already exist if `AFL_SHA1_FILENAMES` is
+ * enabled. */
+static inline int permissive_create(afl_state_t *afl, const char *fn) {
+
+  int fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, DEFAULT_PERMISSION);
+  if (unlikely(fd < 0)) {
+
+    if (!(afl->afl_env.afl_sha1_filenames && errno == EEXIST)) {
+
+      PFATAL("Unable to create '%s'", fn);
+
+    }
+
+  }
+
+  return fd;
+
+}
+
 #if TESTCASE_CACHE == 1
   #error define of TESTCASE_CACHE must be zero or larger than 1
 #endif
diff --git a/include/envs.h b/include/envs.h
index c895f726..57f4d263 100644
--- a/include/envs.h
+++ b/include/envs.h
@@ -108,15 +108,15 @@ static char *afl_environment_variables[] = {
     "AFL_QEMU_PERSISTENT_RETADDR_OFFSET", "AFL_QEMU_PERSISTENT_EXITS",
     "AFL_QEMU_INST_RANGES", "AFL_QEMU_EXCLUDE_RANGES", "AFL_QEMU_SNAPSHOT",
     "AFL_QEMU_TRACK_UNSTABLE", "AFL_QUIET", "AFL_RANDOM_ALLOC_CANARY",
-    "AFL_REAL_PATH", "AFL_SHUFFLE_QUEUE", "AFL_SKIP_BIN_CHECK",
-    "AFL_SKIP_CPUFREQ", "AFL_SKIP_CRASHES", "AFL_SKIP_OSSFUZZ", "AFL_STATSD",
-    "AFL_STATSD_HOST", "AFL_STATSD_PORT", "AFL_STATSD_TAGS_FLAVOR",
-    "AFL_SYNC_TIME", "AFL_TESTCACHE_SIZE", "AFL_TESTCACHE_ENTRIES",
-    "AFL_TMIN_EXACT", "AFL_TMPDIR", "AFL_TOKEN_FILE", "AFL_TRACE_PC",
-    "AFL_USE_ASAN", "AFL_USE_MSAN", "AFL_USE_TRACE_PC", "AFL_USE_UBSAN",
-    "AFL_USE_TSAN", "AFL_USE_CFISAN", "AFL_USE_LSAN", "AFL_WINE_PATH",
-    "AFL_NO_SNAPSHOT", "AFL_EXPAND_HAVOC_NOW", "AFL_USE_FASAN", "AFL_USE_QASAN",
-    "AFL_PRINT_FILENAMES", "AFL_PIZZA_MODE", NULL
+    "AFL_REAL_PATH", "AFL_SHA1_FILENAMES", "AFL_SHUFFLE_QUEUE",
+    "AFL_SKIP_BIN_CHECK", "AFL_SKIP_CPUFREQ", "AFL_SKIP_CRASHES",
+    "AFL_SKIP_OSSFUZZ", "AFL_STATSD", "AFL_STATSD_HOST", "AFL_STATSD_PORT",
+    "AFL_STATSD_TAGS_FLAVOR", "AFL_SYNC_TIME", "AFL_TESTCACHE_SIZE",
+    "AFL_TESTCACHE_ENTRIES", "AFL_TMIN_EXACT", "AFL_TMPDIR", "AFL_TOKEN_FILE",
+    "AFL_TRACE_PC", "AFL_USE_ASAN", "AFL_USE_MSAN", "AFL_USE_TRACE_PC",
+    "AFL_USE_UBSAN", "AFL_USE_TSAN", "AFL_USE_CFISAN", "AFL_USE_LSAN",
+    "AFL_WINE_PATH", "AFL_NO_SNAPSHOT", "AFL_EXPAND_HAVOC_NOW", "AFL_USE_FASAN",
+    "AFL_USE_QASAN", "AFL_PRINT_FILENAMES", "AFL_PIZZA_MODE", NULL
 
 };