blob: bf65567924b6a370de78560231abe8aa679b0051 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/*
Simple Custom Mutator for AFL
Written by Khaled Yakdan <yakdan@code-intelligence.de>
This a simple mutator that assumes that the generates messages starting with
one of the three strings GET, PUT, or DEL followed by a payload. The mutator
randomly selects a commend and mutates the payload of the seed provided as
input.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static const char *commands[] = {
"GET",
"PUT",
"DEL",
};
static size_t data_size = 100;
size_t afl_custom_mutator(uint8_t *data, size_t size, uint8_t *mutated_out,
size_t max_size, unsigned int seed) {
// Seed the PRNG
srand(seed);
// 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;
// Randomly select a command string to add as a header to the packet
memcpy(mutated_out, commands[rand() % 3], 3);
// Mutate the payload of the packet
for (int i = 3; i < mutated_size; i++) {
mutated_out[i] = (data[i] + rand() % 10) & 0xff;
}
return mutated_size;
}
|
