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improve cmplog level 3

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This commit is contained in:
vanhauser-thc
2023-07-21 18:02:30 +02:00
parent 4113b6ccad
commit 5f813bbb86
5 changed files with 106 additions and 96 deletions
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1
docs/Changelog.md
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@ -15,6 +15,7 @@
command line tool! See custom_mutators/aflpp/standalone/
- display the state of the fuzzing run in the UI :-)
- fix timeout setting if '+' is used or a session is restarted
- -c X option to enable base64 transformation solving
- afl-cmin/afl-cmin.bash:
- fixed a bug inherited from vanilla AFL where a coverage of
map[123] = 11 would be the same as map[1123] = 1

3
include/afl-fuzz.h
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@ -674,7 +674,8 @@ typedef struct afl_state {
u32 cmplog_max_filesize;
u32 cmplog_lvl;
u32 colorize_success;
u8 cmplog_enable_arith, cmplog_enable_transform, cmplog_random_colorization;
u8 cmplog_enable_arith, cmplog_enable_transform,
cmplog_enable_xtreme_transform, cmplog_random_colorization;
struct afl_pass_stat *pass_stats;
struct cmp_map *orig_cmp_map;

8
include/config.h
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@ -60,10 +60,6 @@
*
*/
/* if TRANSFORM is enabled with '-l T', this additionally enables base64
encoding/decoding */
// #define CMPLOG_SOLVE_TRANSFORM_BASE64
/* If a redqueen pass finds more than one solution, try to combine them? */
#define CMPLOG_COMBINE
@ -71,10 +67,10 @@
#define CMPLOG_CORPUS_PERCENT 5U
/* Number of potential positions from which we decide if cmplog becomes
useless, default 8096 */
useless, default 12288 */
#define CMPLOG_POSITIONS_MAX (12 * 1024)
/* Maximum allowed fails per CMP value. Default: 128 */
/* Maximum allowed fails per CMP value. Default: 96 */
#define CMPLOG_FAIL_MAX 96
/* -------------------------------------*/

115
src/afl-fuzz-redqueen.c
View File

@ -571,7 +571,6 @@ static u8 its_fuzz(afl_state_t *afl, u8 *buf, u32 len, u8 *status) {
}
// #ifdef CMPLOG_SOLVE_TRANSFORM
static int strntoll(const char *str, size_t sz, char **end, int base,
long long *out) {
@ -656,7 +655,6 @@ static int is_hex(const char *str) {
}
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
// tests 4 bytes at location
static int is_base64(const char *str) {
@ -769,10 +767,6 @@ static void to_base64(u8 *src, u8 *dst, u32 dst_len) {
}
#endif
// #endif
static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
u64 pattern, u64 repl, u64 o_pattern,
u64 changed_val, u8 attr, u32 idx, u32 taint_len,
@ -797,42 +791,54 @@ static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
}
// fprintf(stderr,
// "Encode: %llx->%llx into %llx(<-%llx) at idx=%u "
// "taint_len=%u shape=%u attr=%u\n",
// o_pattern, pattern, repl, changed_val, idx, taint_len,
// hshape, attr);
/*
fprintf(stderr,
"Encode: %llx->%llx into %llx(<-%llx) at idx=%u "
"taint_len=%u shape=%u attr=%u\n",
o_pattern, pattern, repl, changed_val, idx, taint_len,
hshape, attr);
*/
// #ifdef CMPLOG_SOLVE_TRANSFORM
// reverse atoi()/strnu?toll() is expensive, so we only to it in lvl 3
if (afl->cmplog_enable_transform && (lvl & LVL3)) {
u8 *endptr;
u8 use_num = 0, use_unum = 0;
unsigned long long unum;
long long num;
unsigned long long unum = 0;
long long num = 0;
if (afl->queue_cur->is_ascii) {
// if (afl->queue_cur->is_ascii) {
// we first check if our input are ascii numbers that are transformed to
// an integer and used for comparison:
endptr = buf_8;
if (strntoll(buf_8, len - idx, (char **)&endptr, 0, &num)) {
if (!strntoull(buf_8, len - idx, (char **)&endptr, 0, &unum))
if (!strntoull(buf_8, len - idx, (char **)&endptr, 0, &unum)) {
use_unum = 1;
} else
}
} else {
use_num = 1;
}
//}
#ifdef _DEBUG
if (idx == 0)
fprintf(stderr, "ASCII is=%u use_num=%u use_unum=%u idx=%u %llx==%llx\n",
afl->queue_cur->is_ascii, use_num, use_unum, idx, num, pattern);
fprintf(stderr,
"ASCII is=%u use_num=%u>%lld use_unum=%u>%llu idx=%u "
"pattern=0x%llx\n",
afl->queue_cur->is_ascii, use_num, num, use_unum, unum, idx,
pattern);
#endif
// num is likely not pattern as atoi("AAA") will be zero...
// atoi("AAA") == 0 so !num means we have to investigate
if (use_num && ((u64)num == pattern || !num)) {
u8 tmp_buf[32];
@ -961,10 +967,12 @@ static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
// test for arithmetic, eg. "if ((user_val - 0x1111) == 0x1234) ..."
s64 diff = pattern - b_val;
s64 o_diff = o_pattern - o_b_val;
/* fprintf(stderr, "DIFF1 idx=%03u shape=%02u %llx-%llx=%lx\n", idx,
/*
fprintf(stderr, "DIFF1 idx=%03u shape=%02u %llx-%llx=%lx\n", idx,
hshape, o_pattern, o_b_val, o_diff);
fprintf(stderr, "DIFF1 %016llx %llx-%llx=%lx\n", repl, pattern,
b_val, diff); */
b_val, diff);
*/
if (diff == o_diff && diff) {
// this could be an arithmetic transformation
@ -1275,7 +1283,6 @@ static u8 cmp_extend_encoding(afl_state_t *afl, struct cmp_header *h,
// 16 = modified float, 32 = modified integer (modified = wont match
// in original buffer)
// #ifdef CMPLOG_SOLVE_ARITHMETIC
if (!afl->cmplog_enable_arith || lvl < LVL3 || attr == IS_TRANSFORM) {
return 0;
@ -2009,8 +2016,12 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
its_len = MIN(its_len, taint_len);
u32 saved_its_len = its_len;
if (its_len <= 1) { return 0; }
if (lvl & LVL3) {
if (memcmp(changed_val, repl, its_len) != 0) { return 0; }
u32 max_to = MIN(4U, idx);
if (!(lvl & LVL1) && max_to) { from = 1; }
to = max_to;
@ -2089,9 +2100,7 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
if (afl->cmplog_enable_transform && (lvl & LVL3)) {
u32 toupper = 0, tolower = 0, xor = 0, arith = 0, tohex = 0, fromhex = 0;
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
u32 tob64 = 0, fromb64 = 0;
#endif
u32 from_0 = 0, from_x = 0, from_X = 0, from_slash = 0, from_up = 0;
u32 to_0 = 0, to_x = 0, to_slash = 0, to_up = 0;
u8 xor_val[32], arith_val[32], tmp[48];
@ -2144,7 +2153,8 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
if (i < 16 && is_hex(repl + (i << 1))) {
if (afl->cmplog_enable_xtreme_transform && i < 16 &&
is_hex(repl + (i << 1))) {
++tohex;
@ -2163,7 +2173,7 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
if ((i % 2)) {
if (afl->cmplog_enable_xtreme_transform && (i % 2)) {
if (len > idx + i + 1 && is_hex(orig_buf + idx + i)) {
@ -2187,7 +2197,8 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
if (afl->cmplog_enable_xtreme_transform) {
if (i % 3 == 2 && i < 24) {
if (is_base64(repl + ((i / 3) << 2))) tob64 += 3;
@ -2200,7 +2211,7 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
#endif
}
if ((o_pattern[i] ^ orig_buf[idx + i]) == xor_val[i] && xor_val[i]) {
@ -2229,19 +2240,24 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
#ifdef _DEBUG
fprintf(stderr, "RTN %s %s %s %s\n", buf, pattern, orig_buf, o_pattern);
fprintf(stderr,
"RTN idx=%u loop=%u xor=%u arith=%u tolower=%u toupper=%u "
"RTN idx=%u len=%u loop=%u xor=%u arith=%u tolower=%u toupper=%u "
"tohex=%u fromhex=%u to_0=%u to_slash=%u to_x=%u "
"from_0=%u from_slash=%u from_x=%u\n",
idx, i, xor, arith, tolower, toupper, tohex, fromhex, to_0,
to_slash, to_x, from_0, from_slash, from_x);
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
fprintf(stderr, "RTN idx=%u loop=%u tob64=%u from64=%u\n", tob64,
fromb64);
#endif
idx, its_len, i, xor, arith, tolower, toupper, tohex, fromhex,
to_0, to_slash, to_x, from_0, from_slash, from_x);
if (afl->cmplog_enable_xtreme_transform) {
fprintf(stderr, "RTN idx=%u loop=%u tob64=%u from64=%u\n", idx, i,
tob64, fromb64);
}
#endif
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
if (afl->cmplog_enable_xtreme_transform) {
// input is base64 and converted to binary? convert repl to base64!
if ((i % 4) == 3 && i < 24 && fromb64 > i) {
@ -2264,10 +2280,10 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
#endif
}
// input is converted to hex? convert repl to binary!
if (i < 16 && tohex > i) {
if (afl->cmplog_enable_xtreme_transform && i < 16 && tohex > i) {
u32 off;
if (to_slash + to_x + to_0 == 2) {
@ -2292,8 +2308,8 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
// input is hex and converted to binary? convert repl to hex!
if (i && (i % 2) && i < 16 && fromhex &&
fromhex + from_slash + from_x + from_0 > i) {
if (afl->cmplog_enable_xtreme_transform && i && (i % 2) && i < 16 &&
fromhex && fromhex + from_slash + from_x + from_0 > i) {
u8 off = 0;
if (from_slash && from_x) {
@ -2401,11 +2417,9 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
if ((i >= 7 &&
(i >= xor&&i >= arith &&i >= tolower &&i >= toupper &&i > tohex &&i >
(fromhex + from_0 + from_x + from_slash + 1)
#ifdef CMPLOG_SOLVE_TRANSFORM_BASE64
&& i > tob64 + 3 && i > fromb64 + 4
#endif
)) ||
(fromhex + from_0 + from_x + from_slash + 1) &&
(afl->cmplog_enable_xtreme_transform && i > tob64 + 3 &&
i > fromb64 + 4))) ||
repl[i] != changed_val[i] || *status == 1) {
break;
@ -2418,8 +2432,6 @@ static u8 rtn_extend_encoding(afl_state_t *afl, u8 entry,
}
// #endif
return 0;
}
@ -2818,12 +2830,7 @@ u8 input_to_state_stage(afl_state_t *afl, u8 *orig_buf, u8 *buf, u32 len) {
}
} else if ((lvl & LVL1)
// #ifdef CMPLOG_SOLVE_TRANSFORM
|| ((lvl & LVL3) && afl->cmplog_enable_transform)
// #endif
) {
} else if ((lvl & LVL1) || ((lvl & LVL3) && afl->cmplog_enable_transform)) {
if (unlikely(rtn_fuzz(afl, k, orig_buf, buf, cbuf, len, lvl, taint))) {

7
src/afl-fuzz.c
View File

@ -185,7 +185,8 @@ static void usage(u8 *argv0, int more_help) {
" 1=small files, 2=larger files (default), 3=all "
"files,\n"
" A=arithmetic solving, T=transformational solving,\n"
" R=random colorization bytes.\n\n"
" X=extreme transform solving, R=random colorization "
"bytes.\n\n"
"Fuzzing behavior settings:\n"
" -Z - sequential queue selection instead of weighted "
"random\n"
@ -1120,6 +1121,10 @@ int main(int argc, char **argv_orig, char **envp) {
case 'T':
afl->cmplog_enable_transform = 1;
break;
case 'x':
case 'X':
afl->cmplog_enable_xtreme_transform = 1;
break;
case 'r':
case 'R':
afl->cmplog_random_colorization = 1;