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#include "afl-fuzz.h"
#include "afl-mutations.h"
typedef struct my_mutator {
afl_state_t *afl;
u8 *buf;
u32 buf_size;
} my_mutator_t;
my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
(void)seed;
my_mutator_t *data = calloc(1, sizeof(my_mutator_t));
if (!data) {
perror("afl_custom_init alloc");
return NULL;
}
if ((data->buf = malloc(MAX_FILE)) == NULL) {
perror("afl_custom_init alloc");
return NULL;
} else {
data->buf_size = MAX_FILE;
}
data->afl = afl;
return data;
}
/* here we run the AFL++ mutator, which is the best! */
size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
u8 **out_buf, uint8_t *add_buf, size_t add_buf_size,
size_t max_size) {
if (max_size > data->buf_size) {
u8 *ptr = realloc(data->buf, max_size);
if (!ptr) {
return 0;
} else {
data->buf = ptr;
data->buf_size = max_size;
}
}
u32 havoc_steps = 1 + rand_below(data->afl, 16);
/* set everything up, costly ... :( */
memcpy(data->buf, buf, buf_size);
/* the mutation */
u32 out_buf_len = afl_mutate(data->afl, data->buf, buf_size, havoc_steps,
false, true, add_buf, add_buf_size, max_size);
/* return size of mutated data */
*out_buf = data->buf;
return out_buf_len;
}
/**
* Deinitialize everything
*
* @param data The data ptr from afl_custom_init
*/
void afl_custom_deinit(my_mutator_t *data) {
free(data->buf);
free(data);
}
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