mirror of
https://github.com/AFLplusplus/AFLplusplus.git
synced 2025-06-10 01:01:33 +00:00
selective_coverage implementation in afl-compiler-rt
This commit is contained in:
van Hauser
parent
a561de6e97
commit
caf1fbd632
@ -76,7 +76,9 @@
|
||||
#endif
|
||||
|
||||
u8 __afl_area_initial[MAP_INITIAL_SIZE];
|
||||
u8 * __afl_area_ptr_dummy = __afl_area_initial;
|
||||
u8 * __afl_area_ptr = __afl_area_initial;
|
||||
u8 * __afl_area_ptr_backup = __afl_area_initial;
|
||||
u8 * __afl_dictionary;
|
||||
u8 * __afl_fuzz_ptr;
|
||||
u32 __afl_fuzz_len_dummy;
|
||||
@ -87,6 +89,11 @@ u32 __afl_map_size = MAP_SIZE;
|
||||
u32 __afl_dictionary_len;
|
||||
u64 __afl_map_addr;
|
||||
|
||||
// for the __AFL_COVERAGE_ON/__AFL_COVERAGE_OFF features to work:
|
||||
int __afl_selective_coverage __attribute__((weak));
|
||||
int __afl_selective_coverage_start_off __attribute__((weak));
|
||||
int __afl_selective_coverage_temp = 1;
|
||||
|
||||
#ifdef __ANDROID__
|
||||
PREV_LOC_T __afl_prev_loc[NGRAM_SIZE_MAX];
|
||||
u32 __afl_prev_ctx;
|
||||
@ -100,6 +107,7 @@ __thread u32 __afl_cmp_counter;
|
||||
int __afl_sharedmem_fuzzing __attribute__((weak));
|
||||
|
||||
struct cmp_map *__afl_cmp_map;
|
||||
struct cmp_map *__afl_cmp_map_backup;
|
||||
|
||||
/* Child pid? */
|
||||
|
||||
@ -230,7 +238,7 @@ static void __afl_map_shm_fuzz() {
|
||||
static void __afl_map_shm(void) {
|
||||
|
||||
// if we are not running in afl ensure the map exists
|
||||
if (!__afl_area_ptr) { __afl_area_ptr = __afl_area_initial; }
|
||||
if (!__afl_area_ptr) { __afl_area_ptr = __afl_area_ptr_dummy; }
|
||||
|
||||
char *id_str = getenv(SHM_ENV_VAR);
|
||||
|
||||
@ -295,11 +303,17 @@ static void __afl_map_shm(void) {
|
||||
|
||||
if (__afl_area_ptr && __afl_area_ptr != __afl_area_initial) {
|
||||
|
||||
if (__afl_map_addr)
|
||||
if (__afl_map_addr) {
|
||||
|
||||
munmap((void *)__afl_map_addr, __afl_final_loc);
|
||||
else
|
||||
|
||||
} else {
|
||||
|
||||
free(__afl_area_ptr);
|
||||
__afl_area_ptr = __afl_area_initial;
|
||||
|
||||
}
|
||||
|
||||
__afl_area_ptr = __afl_area_ptr_dummy;
|
||||
|
||||
}
|
||||
|
||||
@ -396,9 +410,42 @@ static void __afl_map_shm(void) {
|
||||
|
||||
free(__afl_area_ptr);
|
||||
__afl_area_ptr = NULL;
|
||||
if (__afl_final_loc > MAP_INITIAL_SIZE)
|
||||
|
||||
if (__afl_final_loc > MAP_INITIAL_SIZE) {
|
||||
|
||||
__afl_area_ptr = malloc(__afl_final_loc);
|
||||
if (!__afl_area_ptr) __afl_area_ptr = __afl_area_initial;
|
||||
|
||||
}
|
||||
|
||||
if (!__afl_area_ptr) { __afl_area_ptr = __afl_area_ptr_dummy; }
|
||||
|
||||
}
|
||||
|
||||
__afl_area_ptr_backup = __afl_area_ptr;
|
||||
|
||||
if (__afl_selective_coverage) {
|
||||
|
||||
if (__afl_map_size > MAP_INITIAL_SIZE) {
|
||||
|
||||
__afl_area_ptr_dummy = malloc(__afl_map_size);
|
||||
|
||||
if (__afl_area_ptr_dummy) {
|
||||
|
||||
if (__afl_selective_coverage_start_off) {
|
||||
|
||||
__afl_area_ptr = __afl_area_ptr_dummy;
|
||||
|
||||
}
|
||||
|
||||
} else {
|
||||
|
||||
fprintf(stderr, "Error: __afl_selective_coverage failed!\n");
|
||||
__afl_selective_coverage = 0;
|
||||
// continue;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@ -449,6 +496,8 @@ static void __afl_map_shm(void) {
|
||||
__afl_cmp_map = shmat(shm_id, NULL, 0);
|
||||
#endif
|
||||
|
||||
__afl_cmp_map_backup = __afl_cmp_map;
|
||||
|
||||
if (!__afl_cmp_map || __afl_cmp_map == (void *)-1) {
|
||||
|
||||
perror("shmat for cmplog");
|
||||
@ -903,6 +952,8 @@ int __afl_persistent_loop(unsigned int max_cnt) {
|
||||
|
||||
cycle_cnt = max_cnt;
|
||||
first_pass = 0;
|
||||
__afl_selective_coverage_temp = 1;
|
||||
|
||||
return 1;
|
||||
|
||||
}
|
||||
@ -915,6 +966,7 @@ int __afl_persistent_loop(unsigned int max_cnt) {
|
||||
|
||||
__afl_area_ptr[0] = 1;
|
||||
memset(__afl_prev_loc, 0, NGRAM_SIZE_MAX * sizeof(PREV_LOC_T));
|
||||
__afl_selective_coverage_temp = 1;
|
||||
|
||||
return 1;
|
||||
|
||||
@ -924,7 +976,7 @@ int __afl_persistent_loop(unsigned int max_cnt) {
|
||||
follows the loop is not traced. We do that by pivoting back to the
|
||||
dummy output region. */
|
||||
|
||||
__afl_area_ptr = __afl_area_initial;
|
||||
__afl_area_ptr = __afl_area_ptr_dummy;
|
||||
|
||||
}
|
||||
|
||||
@ -946,7 +998,7 @@ void __afl_manual_init(void) {
|
||||
init_done = 1;
|
||||
is_persistent = 0;
|
||||
__afl_sharedmem_fuzzing = 0;
|
||||
if (__afl_area_ptr == NULL) __afl_area_ptr = __afl_area_initial;
|
||||
if (__afl_area_ptr == NULL) __afl_area_ptr = __afl_area_ptr_dummy;
|
||||
|
||||
if (getenv("AFL_DEBUG"))
|
||||
fprintf(stderr,
|
||||
@ -1007,7 +1059,12 @@ __attribute__((constructor(1))) void __afl_auto_second(void) {
|
||||
else
|
||||
ptr = (u8 *)malloc(__afl_final_loc);
|
||||
|
||||
if (ptr && (ssize_t)ptr != -1) __afl_area_ptr = ptr;
|
||||
if (ptr && (ssize_t)ptr != -1) {
|
||||
|
||||
__afl_area_ptr = ptr;
|
||||
__afl_area_ptr_backup = __afl_area_ptr;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@ -1023,7 +1080,12 @@ __attribute__((constructor(0))) void __afl_auto_first(void) {
|
||||
|
||||
ptr = (u8 *)malloc(1024000);
|
||||
|
||||
if (ptr && (ssize_t)ptr != -1) __afl_area_ptr = ptr;
|
||||
if (ptr && (ssize_t)ptr != -1) {
|
||||
|
||||
__afl_area_ptr = ptr;
|
||||
__afl_area_ptr_backup = __afl_area_ptr;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@ -1315,6 +1377,35 @@ void __cmplog_rtn_hook(u8 *ptr1, u8 *ptr2) {
|
||||
|
||||
/* COVERAGE manipulation features */
|
||||
|
||||
// this variable is then used in the shm setup to create an additional map
|
||||
// if __afl_map_size > MAP_SIZE or cmplog is used.
|
||||
// Especially with cmplog this would result in a ~260MB mem increase per
|
||||
// target run.
|
||||
|
||||
// disable coverage from this point onwards until turned on again
|
||||
void __afl_coverage_off() {
|
||||
|
||||
if (likely(__afl_selective_coverage)) {
|
||||
|
||||
__afl_area_ptr = __afl_area_ptr_dummy;
|
||||
__afl_cmp_map = NULL;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// enable coverage
|
||||
void __afl_coverage_on() {
|
||||
|
||||
if (likely(__afl_selective_coverage && __afl_selective_coverage_temp)) {
|
||||
|
||||
__afl_area_ptr = __afl_area_ptr_backup;
|
||||
__afl_cmp_map = __afl_cmp_map_backup;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// discard all coverage up to this point
|
||||
void __afl_coverage_discard() {
|
||||
|
||||
@ -1329,30 +1420,36 @@ void __afl_coverage_discard() {
|
||||
void __afl_coverage_abort() {
|
||||
|
||||
__afl_coverage_discard();
|
||||
|
||||
if (likely(is_persistent && __afl_selective_coverage)) {
|
||||
|
||||
__afl_coverage_off();
|
||||
__afl_selective_coverage_temp = 0;
|
||||
|
||||
} else {
|
||||
|
||||
exit(0);
|
||||
|
||||
}
|
||||
|
||||
// For the following two functions to work there needs to be a global define,
|
||||
// eg. __AFL_COVERAGE(); after the headers which translates to
|
||||
// int __afl_selective_coverage = 1; by a -D from afl-cc
|
||||
int __afl_selective_coverage __attribute__((weak));
|
||||
// this variable is then used in the shm setup to create an additional map
|
||||
// if __afl_map_size > MAP_SIZE or cmplog is used.
|
||||
// Especially with cmplog this would result in a ~260MB mem increase per
|
||||
// target run.
|
||||
}
|
||||
|
||||
// disable coverage from this point onwards until turned on again
|
||||
void __afl_coverage_off() {
|
||||
// mark this area as especially interesting
|
||||
void __afl_coverage_interesting(u32 id, u8 val) {
|
||||
|
||||
// switch __afl_area_ptr and __afl_cmp_map to (the same) dummy pointer
|
||||
if (val) {
|
||||
|
||||
__afl_area_ptr[id] = val;
|
||||
|
||||
} else {
|
||||
|
||||
do {
|
||||
|
||||
__afl_area_ptr[id] = (u8)rand();
|
||||
|
||||
} while (!__afl_area_ptr[id]);
|
||||
|
||||
}
|
||||
|
||||
// enable coverage
|
||||
void __afl_coverage_on() {
|
||||
|
||||
// switch __afl_area_ptr and __afl_cmp_map to the real map
|
||||
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user