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error handling for custom mutators

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This commit is contained in:
Dominik Maier
2020-03-28 12:58:56 +01:00
parent cda56ca129
commit 81873d97f8
6 changed files with 54 additions and 36 deletions
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15
examples/custom_mutators/example.c
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@ -100,6 +100,7 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
u8 *mutated_out = maybe_grow(BUF_PARAMS(data, fuzz), mutated_size);
if (!mutated_out) {
*out_buf = NULL;
perror("custom mutator allocation (maybe_grow)");
return 0; /* afl-fuzz will very likely error out after this. */
@ -189,16 +190,20 @@ size_t afl_custom_pre_save(my_mutator_t *data, uint8_t *buf, size_t buf_size,
* @param data pointer returned in afl_custom_init for this fuzz case
* @param buf Buffer containing the test case
* @param buf_size Size of the test case
* @return The amount of possible iteration steps to trim the input
* @return The amount of possible iteration steps to trim the input.
* negative on error.
*/
int afl_custom_init_trim(my_mutator_t *data, uint8_t *buf, size_t buf_size) {
int32_t afl_custom_init_trim(my_mutator_t *data, uint8_t *buf, size_t buf_size) {
// We simply trim once
data->trimmming_steps = 1;
data->cur_step = 0;
maybe_grow(BUF_PARAMS(data, trim), buf_size);
if (!maybe_grow(BUF_PARAMS(data, trim), buf_size)) {
perror("init_trim grow");
return -1;
}
memcpy(data->trim_buf, buf, buf_size);
data->trim_size_current = buf_size;
@ -245,9 +250,9 @@ size_t afl_custom_trim(my_mutator_t *data, uint8_t **out_buf) {
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param success Indicates if the last trim operation was successful.
* @return The next trim iteration index (from 0 to the maximum amount of
* steps returned in init_trim)
* steps returned in init_trim). negative ret on failure.
*/
int afl_custom_post_trim(my_mutator_t *data, int success) {
int32_t afl_custom_post_trim(my_mutator_t *data, int success) {
if (success) {