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fuzzer wotking with rtn cmplog

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This commit is contained in:
Andrea Fioraldi
2020-02-18 17:45:57 +01:00
parent a83691d662
commit 2a549d548a
3 changed files with 69 additions and 43 deletions
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77
src/afl-fuzz-redqueen.c
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@ -207,7 +207,7 @@ checksum_fail:
///// Input to State replacement
u8 its_fuzz(u32 idx, u32 size, u8* buf, u32 len, u8* status) {
u8 its_fuzz(u8* buf, u32 len, u8* status) {
u64 orig_hit_cnt, new_hit_cnt;
@ -217,18 +217,11 @@ u8 its_fuzz(u32 idx, u32 size, u8* buf, u32 len, u8* status) {
new_hit_cnt = queued_paths + unique_crashes;
if (unlikely(new_hit_cnt != orig_hit_cnt)) {
if (unlikely(new_hit_cnt != orig_hit_cnt))
*status = 1;
} else {
if (size >= MIN_AUTO_EXTRA && size <= MAX_AUTO_EXTRA)
maybe_add_auto(&buf[idx], size);
else
*status = 2;
}
return 0;
}
@ -254,7 +247,7 @@ u8 cmp_extend_encoding(struct cmp_header* h, u64 pattern, u64 repl, u32 idx,
if (its_len >= 8 && *buf_64 == pattern && *o_buf_64 == pattern) {
*buf_64 = repl;
if (unlikely(its_fuzz(idx, 8, buf, len, status))) return 1;
if (unlikely(its_fuzz(buf, len, status))) return 1;
*buf_64 = pattern;
}
@ -272,7 +265,7 @@ u8 cmp_extend_encoding(struct cmp_header* h, u64 pattern, u64 repl, u32 idx,
if (its_len >= 4 && *buf_32 == (u32)pattern && *o_buf_32 == (u32)pattern) {
*buf_32 = (u32)repl;
if (unlikely(its_fuzz(idx, 4, buf, len, status))) return 1;
if (unlikely(its_fuzz(buf, len, status))) return 1;
*buf_32 = pattern;
}
@ -290,7 +283,7 @@ u8 cmp_extend_encoding(struct cmp_header* h, u64 pattern, u64 repl, u32 idx,
if (its_len >= 2 && *buf_16 == (u16)pattern && *o_buf_16 == (u16)pattern) {
*buf_16 = (u16)repl;
if (unlikely(its_fuzz(idx, 2, buf, len, status))) return 1;
if (unlikely(its_fuzz(buf, len, status))) return 1;
*buf_16 = (u16)pattern;
}
@ -308,7 +301,7 @@ u8 cmp_extend_encoding(struct cmp_header* h, u64 pattern, u64 repl, u32 idx,
if (its_len >= 2 && *buf_8 == (u8)pattern && *o_buf_8 == (u8)pattern) {
*buf_8 = (u8)repl;
if (unlikely(its_fuzz(idx, 1, buf, len, status)))
if (unlikely(its_fuzz(buf, len, status)))
return 1;
*buf_16 = (u16)pattern;
@ -423,7 +416,26 @@ u8 cmp_fuzz(u32 key, u8* orig_buf, u8* buf, u32 len) {
u8 rtn_extend_encoding(struct cmp_header* h, u8* pattern, u8* repl, u32 idx,
u8* orig_buf, u8* buf, u32 len, u8* status) {
*status = 2;
u32 i;
u32 its_len = MIN(32, len - idx);
u8 save[32];
memcpy(save, &buf[idx], its_len);
*status = 0;
for (i = 0; i < its_len; ++i) {
if (pattern[idx + i] != orig_buf[idx + i] || *status == 1)
break;
buf[idx +i] = repl[idx + i];
if (unlikely(its_fuzz(buf, len, status))) return 1;
}
memcpy(&buf[idx], save, i);
return 0;
}
@ -444,9 +456,9 @@ u8 rtn_fuzz(u32 key, u8* orig_buf, u8* buf, u32 len) {
struct cmpfn_operands* o = &((struct cmpfn_operands*)cmp_map->log[key])[i];
// opt not in the paper
//for (j = 0; j < i; ++j)
// if (cmp_map->log[key][j].v0 == o->v0 && cmp_map->log[key][i].v1 == o->v1)
// goto cmp_fuzz_next_iter;
for (j = 0; j < i; ++j)
if (!memcmp(&((struct cmpfn_operands*)cmp_map->log[key])[j], o, sizeof(struct cmpfn_operands)))
goto rtn_fuzz_next_iter;
for (idx = 0; idx < len && fails < 8; ++idx) {
@ -476,7 +488,7 @@ u8 rtn_fuzz(u32 key, u8* orig_buf, u8* buf, u32 len) {
}
cmp_fuzz_next_iter:
rtn_fuzz_next_iter:
stage_cur++;
}
@ -491,6 +503,7 @@ u8 rtn_fuzz(u32 key, u8* orig_buf, u8* buf, u32 len) {
u8 input_to_state_stage(char** argv, u8* orig_buf, u8* buf, u32 len,
u32 exec_cksum) {
u8 r = 1;
its_argv = argv;
if (unlikely(colorization(buf, len, exec_cksum))) return 1;
@ -513,31 +526,37 @@ u8 input_to_state_stage(char** argv, u8* orig_buf, u8* buf, u32 len,
for (k = 0; k < CMP_MAP_W; ++k) {
if (!cmp_map->headers[k].hits) continue;
if (cmp_map->headers[k].hits > CMP_MAP_H)
stage_max += CMP_MAP_H;
if (cmp_map->headers[k].type == CMP_TYPE_INS)
stage_max += MIN(cmp_map->headers[k].hits, CMP_MAP_H);
else
stage_max += cmp_map->headers[k].hits;
stage_max += MIN(cmp_map->headers[k].hits, CMP_MAP_RTN_H);
}
for (k = 0; k < CMP_MAP_W; ++k) {
if (!cmp_map->headers[k].hits) continue;
if (cmp_map->headers[k].type == CMP_TYPE_INS)
cmp_fuzz(k, orig_buf, buf, len);
else
rtn_fuzz(k, orig_buf, buf, len);
if (cmp_map->headers[k].type == CMP_TYPE_INS) {
if (unlikely(cmp_fuzz(k, orig_buf, buf, len)))
goto exit_its;
} else {
if (unlikely(rtn_fuzz(k, orig_buf, buf, len)))
goto exit_its;
}
}
memcpy(orig_buf, buf, len);
r = 0;
exit_its:
memcpy(orig_buf, buf, len);
new_hit_cnt = queued_paths + unique_crashes;
stage_finds[STAGE_ITS] += new_hit_cnt - orig_hit_cnt;
stage_cycles[STAGE_ITS] += total_execs - orig_execs;
return 0;
return r;
}