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fix auto map discovery

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This commit is contained in:
vanhauser-thc
2021-03-10 19:22:57 +01:00
parent 2777784f4f
commit a10a627622
2 changed files with 77 additions and 90 deletions
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4
src/afl-common.c
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@ -1123,7 +1123,7 @@ u8 *u_stringify_time_diff(u8 *buf, u64 cur_ms, u64 event_ms) {
/* Reads the map size from ENV */
u32 get_map_size(void) {
uint32_t map_size = (MAP_SIZE << 2); // needed for target ctors :(
uint32_t map_size = 8000000; // a very large default map
char * ptr;
if ((ptr = getenv("AFL_MAP_SIZE")) || (ptr = getenv("AFL_MAPSIZE"))) {
@ -1131,7 +1131,7 @@ u32 get_map_size(void) {
map_size = atoi(ptr);
if (!map_size || map_size > (1 << 29)) {
FATAL("illegal AFL_MAP_SIZE %u, must be between %u and %u", map_size, 32U,
FATAL("illegal AFL_MAP_SIZE %u, must be between %u and %u", map_size, 64U,
1U << 29);
}

69
src/afl-fuzz.c
View File

@ -351,7 +351,7 @@ int main(int argc, char **argv_orig, char **envp) {
exit_1 = !!afl->afl_env.afl_bench_just_one;
SAYF(cCYA "afl-fuzz" VERSION cRST
" based on afl by Michal Zalewski and a big online community\n");
" based on afl by Michal Zalewski and a large online community\n");
doc_path = access(DOC_PATH, F_OK) != 0 ? (u8 *)"docs" : (u8 *)DOC_PATH;
@ -1562,32 +1562,39 @@ int main(int argc, char **argv_orig, char **envp) {
}
if (afl->non_instrumented_mode || afl->fsrv.qemu_mode || afl->unicorn_mode) {
map_size = afl->fsrv.map_size = MAP_SIZE;
afl->virgin_bits = ck_realloc(afl->virgin_bits, map_size);
afl->virgin_tmout = ck_realloc(afl->virgin_tmout, map_size);
afl->virgin_crash = ck_realloc(afl->virgin_crash, map_size);
afl->var_bytes = ck_realloc(afl->var_bytes, map_size);
afl->top_rated = ck_realloc(afl->top_rated, map_size * sizeof(void *));
afl->clean_trace = ck_realloc(afl->clean_trace, map_size);
afl->clean_trace_custom = ck_realloc(afl->clean_trace_custom, map_size);
afl->first_trace = ck_realloc(afl->first_trace, map_size);
afl->map_tmp_buf = ck_realloc(afl->map_tmp_buf, map_size);
}
afl->argv = use_argv;
afl->fsrv.trace_bits =
afl_shm_init(&afl->shm, afl->fsrv.map_size, afl->non_instrumented_mode);
if (!afl->non_instrumented_mode && !afl->fsrv.qemu_mode &&
!afl->unicorn_mode) {
u32 set_env = 0;
if (!getenv("AFL_MAP_SIZE")) {
if (afl->fsrv.map_size <= 8000000) {
afl->fsrv.map_size = 8000000; // dummy temporary value
setenv("AFL_MAP_SIZE", "8000000", 1);
set_env = 1;
}
u32 prev_map_size = afl->fsrv.map_size;
u32 new_map_size = afl_fsrv_get_mapsize(
&afl->fsrv, afl->argv, &afl->stop_soon, afl->afl_env.afl_debug_child);
if (new_map_size && new_map_size != prev_map_size) {
// only reinitialize when it makes sense
if (map_size < new_map_size ||
(new_map_size > map_size && new_map_size - map_size > MAP_SIZE)) {
(new_map_size > map_size && new_map_size - map_size > MAP_SIZE &&
(!afl->cmplog_binary || new_map_size == MAP_SIZE))) {
OKF("Re-initializing maps to %u bytes", new_map_size);
@ -1595,11 +1602,9 @@ int main(int argc, char **argv_orig, char **envp) {
afl->virgin_tmout = ck_realloc(afl->virgin_tmout, new_map_size);
afl->virgin_crash = ck_realloc(afl->virgin_crash, new_map_size);
afl->var_bytes = ck_realloc(afl->var_bytes, new_map_size);
afl->top_rated =
ck_realloc(afl->top_rated, new_map_size * sizeof(void *));
afl->top_rated = ck_realloc(afl->top_rated, new_map_size * sizeof(void *));
afl->clean_trace = ck_realloc(afl->clean_trace, new_map_size);
afl->clean_trace_custom =
ck_realloc(afl->clean_trace_custom, new_map_size);
afl->clean_trace_custom = ck_realloc(afl->clean_trace_custom, new_map_size);
afl->first_trace = ck_realloc(afl->first_trace, new_map_size);
afl->map_tmp_buf = ck_realloc(afl->map_tmp_buf, new_map_size);
@ -1611,13 +1616,9 @@ int main(int argc, char **argv_orig, char **envp) {
setenv("AFL_NO_AUTODICT", "1", 1); // loaded already
afl_fsrv_start(&afl->fsrv, afl->argv, &afl->stop_soon,
afl->afl_env.afl_debug_child);
}
map_size = new_map_size;
if (set_env) { unsetenv("AFL_MAP_SIZE"); }
}
} else {
afl->fsrv.map_size = map_size;
@ -1633,25 +1634,13 @@ int main(int argc, char **argv_orig, char **envp) {
afl->cmplog_fsrv.cmplog_binary = afl->cmplog_binary;
afl->cmplog_fsrv.init_child_func = cmplog_exec_child;
u32 set_env = 0;
if (!getenv("AFL_MAP_SIZE")) {
afl->fsrv.map_size = 8000000; // dummy temporary value
setenv("AFL_MAP_SIZE", "8000000", 1);
set_env = 1;
}
u32 prev_map_size = afl->fsrv.map_size;
u32 new_map_size =
afl_fsrv_get_mapsize(&afl->cmplog_fsrv, afl->argv, &afl->stop_soon,
afl->afl_env.afl_debug_child);
if (new_map_size && new_map_size != prev_map_size) {
// only reinitialize when it needs to be larger
if (map_size < new_map_size) {
// only reinitialize when necessary
if (map_size < new_map_size ||
(new_map_size > map_size && new_map_size - map_size > MAP_SIZE)) {
OKF("Re-initializing maps to %u bytes due cmplog", new_map_size);
@ -1683,14 +1672,12 @@ int main(int argc, char **argv_orig, char **envp) {
map_size = new_map_size;
}
if (set_env) { unsetenv("AFL_MAP_SIZE"); }
}
} else {
afl->cmplog_fsrv.map_size = map_size;
}
OKF("Cmplog forkserver successfully started");
}