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Add post-process functionality in write_with_gap

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This commit is contained in:
rish9101
2020-07-20 01:12:28 +05:30
parent aa3856261d
commit 4898db80cb
1 changed files with 52 additions and 11 deletions
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63
src/afl-fuzz-run.c
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@ -142,18 +142,58 @@ static void write_with_gap(afl_state_t *afl, void *mem, u32 len, u32 skip_at,
s32 fd = afl->fsrv.out_fd;
u32 tail_len = len - skip_at - skip_len;
/* We first copy the mem into a new memory region removing the gaps
and then carry out any post-processing work on them. Then copy them out to
shared-mem or write to file */
void *mem_trimmed =
ck_alloc(skip_at + tail_len +
1); // 1 extra size allocated to remove chance of overflow
if (skip_at) { memcpy(mem_trimmed, mem, skip_at); }
if (tail_len) {
memcpy(mem_trimmed + skip_at, (u8 *)mem + skip_at + skip_len, tail_len);
}
ssize_t new_size = skip_at + tail_len;
void * new_mem = mem_trimmed;
u8 * new_buf = NULL;
if (unlikely(afl->custom_mutators_count)) {
LIST_FOREACH(&afl->custom_mutator_list, struct custom_mutator, {
if (el->afl_custom_post_process) {
new_size =
el->afl_custom_post_process(el->data, new_mem, new_size, &new_buf);
}
new_mem = new_buf;
});
}
if (afl->fsrv.shmem_fuzz) {
if (skip_at) { memcpy(afl->fsrv.shmem_fuzz, mem, skip_at); }
if ((new_buf)) {
if (tail_len) {
memcpy(afl->fsrv.shmem_fuzz + skip_at, (u8 *)mem + skip_at + skip_len,
tail_len);
memcpy(afl->fsrv.shmem_fuzz, new_buf, new_size);
}
*afl->fsrv.shmem_fuzz_len = len - skip_len;
else {
memcpy(afl->fsrv.shmem_fuzz, mem_trimmed, new_size);
}
*afl->fsrv.shmem_fuzz_len = new_size;
#ifdef _DEBUG
if (afl->debug) {
@ -197,18 +237,19 @@ static void write_with_gap(afl_state_t *afl, void *mem, u32 len, u32 skip_at,
}
if (skip_at) { ck_write(fd, mem, skip_at, afl->fsrv.out_file); }
if (new_buf) {
u8 *memu8 = mem;
if (tail_len) {
ck_write(fd, new_buf, new_size, afl->fsrv.out_file);
ck_write(fd, memu8 + skip_at + skip_len, tail_len, afl->fsrv.out_file);
} else {
ck_write(fd, mem_trimmed, new_size, afl->fsrv.out_file);
}
if (!afl->fsrv.out_file) {
if (ftruncate(fd, len - skip_len)) { PFATAL("ftruncate() failed"); }
if (ftruncate(fd, new_size)) { PFATAL("ftruncate() failed"); }
lseek(fd, 0, SEEK_SET);
} else {