diff options
Diffstat (limited to 'qemu_mode/libcompcov/libcompcov.so.c')
| -rw-r--r-- | qemu_mode/libcompcov/libcompcov.so.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/qemu_mode/libcompcov/libcompcov.so.c b/qemu_mode/libcompcov/libcompcov.so.c index 19eb821e..582230db 100644 --- a/qemu_mode/libcompcov/libcompcov.so.c +++ b/qemu_mode/libcompcov/libcompcov.so.c @@ -51,6 +51,8 @@ static int (*__libc_strcasecmp)(const char*, const char*); static int (*__libc_strncasecmp)(const char*, const char*, size_t); static int (*__libc_memcmp)(const void*, const void*, size_t); +static int debug_fd = -1; + static size_t __strlen2(const char *s1, const char *s2, size_t max_length) { // from https://github.com/googleprojectzero/CompareCoverage @@ -118,6 +120,12 @@ static void __compcov_trace(u64 cur_loc, const u8* v0, const u8* v1, size_t n) { size_t i; + if (debug_fd != 1) { + char debugbuf[4096]; + snprintf(debugbuf, sizeof(debugbuf), "0x%llx %s %s %lu\n", cur_loc, v0 == NULL ? "(null)" : (char*)v0, v1 == NULL ? "(null)" : (char*)v1, n); + write(debug_fd, debugbuf, strlen(debugbuf)); + } + for (i = 0; i < n && v0[i] == v1[i]; ++i) { __compcov_afl_map[cur_loc +i]++; @@ -262,6 +270,9 @@ int memcmp(const void* mem1, const void* mem2, size_t len) { __attribute__((constructor)) void __compcov_init(void) { + if (getenv("AFL_QEMU_COMPCOV_DEBUG") != NULL) + debug_fd = open("compcov.debug", O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, 0644); + __compcov_load(); } |