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custom mutators might work again like this

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This commit is contained in:
Dominik Maier
2020-03-23 18:18:54 +01:00
parent 83f925ccc9
commit 77b81e7361
5 changed files with 338 additions and 232 deletions
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76
examples/custom_mutators/example.c
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@ -3,6 +3,7 @@
Written by Khaled Yakdan <yakdan@code-intelligence.de>
Andrea Fioraldi <andreafioraldi@gmail.com>
Shengtuo Hu <h1994st@gmail.com>
Dominik Maier <mail@dmnk.co>
*/
// You need to use -I /path/to/AFLplusplus/include
@ -12,6 +13,8 @@
#include <stdlib.h>
#include <string.h>
#define DATA_SIZE (100)
static const char *commands[] = {
"GET",
@ -20,12 +23,36 @@ static const char *commands[] = {
};
static size_t data_size = 100;
void afl_custom_init(unsigned int seed) {
typedef struct my_mutator {
afl_t *afl;
// any additional data here!
} my_mutator_t;
/**
* Initialize this custom mutator
*
* @param[in] afl a pointer to the internal state object. Can be ignored for now.
* @param[in] seed A seed for this mutator - the same seed should always mutate in the same way.
* @return Pointer to the data object this custom mutator instance should use.
* There may be multiple instances of this mutator in one afl-fuzz run!
* Returns NULL on error.
*/
my_mutator_t *afl_custom_init(afl_t *afl, unsigned int seed) {
srand(seed); // needed also by surgical_havoc_mutate()
my_mutator_t *data = calloc(1, sizeof(my_mutator_t));
if (!data) {
perror("afl_custom_init alloc");
return NULL;
}
data->afl = afl;
return data;
}
/**
@ -33,6 +60,7 @@ void afl_custom_init(unsigned int seed) {
*
* (Optional for now. Required in the future)
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param[in] buf Pointer to input data to be mutated
* @param[in] buf_size Size of input data
* @param[in] add_buf Buffer containing the additional test case
@ -41,13 +69,14 @@ void afl_custom_init(unsigned int seed) {
* produce data larger than max_size.
* @return Size of the mutated output.
*/
size_t afl_custom_fuzz(uint8_t **buf, size_t buf_size, uint8_t *add_buf,
size_t afl_custom_fuzz(my_mutator_t *data, uint8_t **buf, size_t buf_size,
uint8_t *add_buf,
size_t add_buf_size, // add_buf can be NULL
size_t max_size) {
// Make sure that the packet size does not exceed the maximum size expected by
// the fuzzer
size_t mutated_size = data_size <= max_size ? data_size : max_size;
size_t mutated_size = DATA_SIZE <= max_size ? DATA_SIZE : max_size;
if (mutated_size > buf_size) *buf = realloc(*buf, mutated_size);
@ -59,10 +88,10 @@ size_t afl_custom_fuzz(uint8_t **buf, size_t buf_size, uint8_t *add_buf,
// Mutate the payload of the packet
int i;
for (i = 0; i < 8; ++i) {
// Randomly perform one of the (no len modification) havoc mutations
surgical_havoc_mutate(mutated_out, 3, mutated_size);
}
return mutated_size;
@ -76,6 +105,7 @@ size_t afl_custom_fuzz(uint8_t **buf, size_t buf_size, uint8_t *add_buf,
* (Optional) If this functionality is not needed, simply don't define this
* function.
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param[in] buf Buffer containing the test case to be executed
* @param[in] buf_size Size of the test case
* @param[out] out_buf Pointer to the buffer containing the test case after
@ -83,7 +113,7 @@ size_t afl_custom_fuzz(uint8_t **buf, size_t buf_size, uint8_t *add_buf,
* will release the memory after saving the test case.
* @return Size of the output buffer after processing
*/
size_t afl_custom_pre_save(uint8_t *buf, size_t buf_size, uint8_t **out_buf) {
size_t afl_custom_pre_save(my_mutator_t *data, uint8_t *buf, size_t buf_size, uint8_t **out_buf) {
size_t out_buf_size;
@ -118,11 +148,12 @@ static int cur_step;
*
* (Optional)
*
* @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
*/
int afl_custom_init_trim(uint8_t *buf, size_t buf_size) {
int afl_custom_init_trim(my_mutator_t *data, uint8_t *buf, size_t buf_size) {
// We simply trim once
trimmming_steps = 1;
@ -146,12 +177,13 @@ int afl_custom_init_trim(uint8_t *buf, size_t buf_size) {
*
* (Optional)
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param[out] out_buf Pointer to the buffer containing the trimmed test case.
* External library should allocate memory for out_buf. AFL++ will release
* the memory after saving the test case.
* @param[out] out_buf_size Pointer to the size of the trimmed test case
*/
void afl_custom_trim(uint8_t **out_buf, size_t *out_buf_size) {
void afl_custom_trim(my_mutator_t *data, uint8_t **out_buf, size_t *out_buf_size) {
*out_buf_size = trim_buf_size - 1;
@ -169,11 +201,12 @@ void afl_custom_trim(uint8_t **out_buf, size_t *out_buf_size) {
*
* (Optional)
*
* @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)
*/
int afl_custom_post_trim(int success) {
int afl_custom_post_trim(my_mutator_t *data, int success) {
if (success) {
@ -192,6 +225,7 @@ int afl_custom_post_trim(int success) {
*
* (Optional)
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param[inout] buf Pointer to the input data to be mutated and the mutated
* output
* @param[in] buf_size Size of input data
@ -199,7 +233,7 @@ int afl_custom_post_trim(int success) {
* not produce data larger than max_size.
* @return Size of the mutated output.
*/
size_t afl_custom_havoc_mutation(uint8_t **buf, size_t buf_size,
size_t afl_custom_havoc_mutation(my_mutator_t *data, uint8_t **buf, size_t buf_size,
size_t max_size) {
if (buf_size == 0) {
@ -223,9 +257,10 @@ size_t afl_custom_havoc_mutation(uint8_t **buf, size_t buf_size,
*
* (Optional)
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @return The probability (0-100).
*/
uint8_t afl_custom_havoc_mutation_probability(void) {
uint8_t afl_custom_havoc_mutation_probability(my_mutator_t *data) {
return 5; // 5 %
@ -236,11 +271,12 @@ uint8_t afl_custom_havoc_mutation_probability(void) {
*
* (Optional)
*
* @param[in] data pointer returned in afl_custom_init for this fuzz case
* @param filename File name of the test case in the queue entry
* @return Return True(1) if the fuzzer will fuzz the queue entry, and
* False(0) otherwise.
*/
uint8_t afl_custom_queue_get(const uint8_t *filename) {
uint8_t afl_custom_queue_get(my_mutator_t *data, const uint8_t *filename) {
return 1;
@ -252,13 +288,25 @@ uint8_t afl_custom_queue_get(const uint8_t *filename) {
*
* (Optional)
*
* @param data pointer returned in afl_custom_init for this fuzz case
* @param filename_new_queue File name of the new queue entry
* @param filename_orig_queue File name of the original queue entry
*/
void afl_custom_queue_new_entry(const uint8_t *filename_new_queue,
void afl_custom_queue_new_entry(my_mutator_t *data, const uint8_t *filename_new_queue,
const uint8_t *filename_orig_queue) {
/* Additional analysis on the original or new test case */
}
/**
* Deinitialize everything
*
* @param data The data ptr from afl_custom_init
*/
void afl_custom_deinit(my_mutator_t *data) {
free(data);
}