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cmplog runtime for LLVM

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Andrea Fioraldi
2020-01-30 22:40:09 +01:00
parent b8bad5a227
commit 95a98fb3e8
13 changed files with 1377 additions and 517 deletions
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399
src/afl-fuzz-cmplog.c
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@ -1,373 +1,33 @@
/*
american fuzzy lop++ - cmplog execution routines
------------------------------------------------
Originally written by Michal Zalewski
Forkserver design by Jann Horn <jannhorn@googlemail.com>
Now maintained by by Marc Heuse <mh@mh-sec.de>,
Heiko Eißfeldt <heiko.eissfeldt@hexco.de> and
Andrea Fioraldi <andreafioraldi@gmail.com>
Copyright 2016, 2017 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
Shared code to handle the shared memory. This is used by the fuzzer
as well the other components like afl-tmin, afl-showmap, etc...
*/
#include "afl-fuzz.h"
#include "cmplog.h"
#define SWAP64(_x) \
({ \
\
u64 _ret = (_x); \
_ret = \
(_ret & 0x00000000FFFFFFFF) << 32 | (_ret & 0xFFFFFFFF00000000) >> 32; \
_ret = \
(_ret & 0x0000FFFF0000FFFF) << 16 | (_ret & 0xFFFF0000FFFF0000) >> 16; \
_ret = \
(_ret & 0x00FF00FF00FF00FF) << 8 | (_ret & 0xFF00FF00FF00FF00) >> 8; \
_ret; \
\
})
u8 common_fuzz_cmplog_stuff(char** argv, u8* out_buf, u32 len);
extern struct cmp_map* cmp_map; // defined in afl-sharedmem.c
u8* cmplog_binary;
char** its_argv;
///// Colorization
struct range {
u32 start;
u32 end;
struct range* next;
};
struct range* add_range(struct range* ranges, u32 start, u32 end) {
struct range* r = ck_alloc_nozero(sizeof(struct range));
r->start = start;
r->end = end;
r->next = ranges;
return r;
}
struct range* pop_biggest_range(struct range** ranges) {
struct range* r = *ranges;
struct range* prev = NULL;
struct range* rmax = NULL;
struct range* prev_rmax = NULL;
u32 max_size = 0;
while (r) {
u32 s = r->end - r->start;
if (s >= max_size) {
max_size = s;
prev_rmax = prev;
rmax = r;
}
prev = r;
r = r->next;
}
if (rmax) {
if (prev_rmax)
prev_rmax->next = rmax->next;
else
*ranges = rmax->next;
}
return rmax;
}
u8 get_exec_checksum(u8* buf, u32 len, u32* cksum) {
if (unlikely(common_fuzz_stuff(its_argv, buf, len))) return 1;
*cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
return 0;
}
static void rand_replace(u8* buf, u32 len) {
u32 i;
for (i = 0; i < len; ++i)
buf[i] = UR(256);
}
u8 colorization(u8* buf, u32 len, u32 exec_cksum) {
struct range* ranges = add_range(NULL, 0, len);
u8* backup = ck_alloc_nozero(len);
u64 orig_hit_cnt, new_hit_cnt;
orig_hit_cnt = queued_paths + unique_crashes;
stage_name = "colorization";
stage_short = "colorization";
stage_max = 1000;
struct range* rng;
stage_cur = stage_max;
while ((rng = pop_biggest_range(&ranges)) != NULL && stage_cur) {
u32 s = rng->end - rng->start;
memcpy(backup, buf + rng->start, s);
rand_replace(buf + rng->start, s);
u32 cksum;
if (unlikely(get_exec_checksum(buf, len, &cksum))) return 1;
if (cksum != exec_cksum) {
ranges = add_range(ranges, rng->start, rng->start + s / 2);
ranges = add_range(ranges, rng->start + s / 2 + 1, rng->end);
memcpy(buf + rng->start, backup, s);
}
ck_free(rng);
--stage_cur;
}
new_hit_cnt = queued_paths + unique_crashes;
stage_finds[STAGE_COLORIZATION] += new_hit_cnt - orig_hit_cnt;
stage_cycles[STAGE_COLORIZATION] += stage_max - stage_cur;
while (ranges) {
rng = ranges;
ranges = ranges->next;
ck_free(rng);
}
return 0;
}
///// Input to State replacement
u8 its_fuzz(u32 idx, u32 size, u8* buf, u32 len, u8* status) {
u64 orig_hit_cnt, new_hit_cnt;
orig_hit_cnt = queued_paths + unique_crashes;
if (unlikely(common_fuzz_stuff(its_argv, buf, len))) return 1;
new_hit_cnt = queued_paths + unique_crashes;
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);
*status = 2;
}
return 0;
}
u8 cmp_extend_encoding(struct cmp_header* h, u64 pattern, u64 repl, u32 idx,
u8* orig_buf, u8* buf, u32 len, u8 do_reverse,
u8* status) {
u64* buf_64 = (u64*)&buf[idx];
u32* buf_32 = (u32*)&buf[idx];
u16* buf_16 = (u16*)&buf[idx];
// u8* buf_8 = &buf[idx];
u64* o_buf_64 = (u64*)&orig_buf[idx];
u32* o_buf_32 = (u32*)&orig_buf[idx];
u16* o_buf_16 = (u16*)&orig_buf[idx];
// u8* o_buf_8 = &orig_buf[idx];
u32 its_len = len - idx;
*status = 0;
if (SHAPE_BYTES(h->shape) == 8) {
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;
*buf_64 = pattern;
}
// reverse encoding
if (do_reverse)
if (unlikely(cmp_extend_encoding(h, SWAP64(pattern), SWAP64(repl), idx,
orig_buf, buf, len, 0, status)))
return 1;
}
if (SHAPE_BYTES(h->shape) == 4 || *status == 2) {
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;
*buf_32 = pattern;
}
// reverse encoding
if (do_reverse)
if (unlikely(cmp_extend_encoding(h, SWAP32(pattern), SWAP32(repl), idx,
orig_buf, buf, len, 0, status)))
return 1;
}
if (SHAPE_BYTES(h->shape) == 2 || *status == 2) {
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;
*buf_16 = (u16)pattern;
}
// reverse encoding
if (do_reverse)
if (unlikely(cmp_extend_encoding(h, SWAP16(pattern), SWAP16(repl), idx,
orig_buf, buf, len, 0, status)))
return 1;
}
/*if (SHAPE_BYTES(h->shape) == 1 || *status == 2) {
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)))
return 1;
*buf_16 = (u16)pattern;
}
}*/
return 0;
}
u8 cmp_fuzz(u32 key, u8* orig_buf, u8* buf, u32 len) {
struct cmp_header* h = &cmp_map->headers[key];
u32 i, j, idx;
u32 loggeds = h->hits;
if (h->hits > CMP_MAP_H) loggeds = CMP_MAP_H;
u8 status;
// opt not in the paper
u32 fails = 0;
for (i = 0; i < loggeds; ++i) {
struct cmp_operands* o = &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 (idx = 0; idx < len && fails < 8; ++idx) {
if (unlikely(cmp_extend_encoding(h, o->v0, o->v1, idx, orig_buf, buf, len,
1, &status)))
return 1;
if (status == 2)
++fails;
else if (status == 1)
break;
if (unlikely(cmp_extend_encoding(h, o->v1, o->v0, idx, orig_buf, buf, len,
1, &status)))
return 1;
if (status == 2)
++fails;
else if (status == 1)
break;
}
cmp_fuzz_next_iter:
stage_cur++;
}
return 0;
}
///// Input to State stage
// queue_cur->exec_cksum
u8 input_to_state_stage(char** argv, u8* orig_buf, u8* buf, u32 len,
u32 exec_cksum) {
its_argv = argv;
if (unlikely(colorization(buf, len, exec_cksum))) return 1;
// do it manually, forkserver clear only trace_bits
memset(cmp_map->headers, 0, sizeof(cmp_map->headers));
if (unlikely(common_fuzz_cmplog_stuff(argv, buf, len))) return 1;
u64 orig_hit_cnt, new_hit_cnt;
u64 orig_execs = total_execs;
orig_hit_cnt = queued_paths + unique_crashes;
stage_name = "input-to-state";
stage_short = "its";
stage_max = 0;
stage_cur = 0;
u32 k;
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;
else
stage_max += cmp_map->headers[k].hits;
}
for (k = 0; k < CMP_MAP_W; ++k) {
if (!cmp_map->headers[k].hits) continue;
cmp_fuzz(k, orig_buf, buf, len);
}
memcpy(buf, orig_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;
}
//// CmpLog forkserver
s32 cmplog_forksrv_pid, cmplog_child_pid, cmplog_fsrv_ctl_fd, cmplog_fsrv_st_fd;
static s32 cmplog_child_pid, cmplog_fsrv_ctl_fd, cmplog_fsrv_st_fd;
void init_cmplog_forkserver(char** argv) {
@ -490,8 +150,6 @@ void init_cmplog_forkserver(char** argv) {
"msan_track_origins=0",
0);
setenv("__AFL_CMPLOG_MODE__", "1", 1);
argv[0] = cmplog_binary;
execv(cmplog_binary, argv);
@ -783,8 +441,6 @@ u8 run_cmplog_target(char** argv, u32 timeout) {
"symbolize=0:"
"msan_track_origins=0", 0);
setenv("__AFL_CMPLOG_MODE__", "1", 1);
argv[0] = cmplog_binary;
execv(cmplog_binary, argv);
@ -977,4 +633,3 @@ u8 common_fuzz_cmplog_stuff(char** argv, u8* out_buf, u32 len) {
return 0;
}