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shmem map size in config.h

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This commit is contained in:
vanhauser-thc
2021-03-17 10:26:02 +01:00
parent a7797f0cb9
commit 5e2a5f1110
5 changed files with 60 additions and 43 deletions
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9
include/config.h
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@ -34,6 +34,15 @@
* * * *
******************************************************/ ******************************************************/
/* Default shared memory map size. Most targets just need a coverage map
between 20-250kb. Plus there is an auto-detection feature in afl-fuzz.
However if a target has problematic constructors and init arrays then
this can fail. Hence afl-fuzz deploys a larger default map. The largest
map seen so far is the xlsx fuzzer for libreoffice which is 5MB.
At runtime this value can be overriden via AFL_MAP_SIZE.
Default: 8MB (defined in bytes) */
#define DEFAULT_SHMEM_SIZE (8 * 1024 * 1024)
/* CMPLOG/REDQUEEN TUNING /* CMPLOG/REDQUEEN TUNING
* *
* Here you can modify tuning and solving options for CMPLOG. * Here you can modify tuning and solving options for CMPLOG.

2
src/afl-common.c
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@ -1072,7 +1072,7 @@ u8 *u_stringify_time_diff(u8 *buf, u64 cur_ms, u64 event_ms) {
/* Reads the map size from ENV */ /* Reads the map size from ENV */
u32 get_map_size(void) { u32 get_map_size(void) {
uint32_t map_size = 8000000; // a very large default map uint32_t map_size = DEFAULT_SHMEM_SIZE;
char * ptr; char * ptr;
if ((ptr = getenv("AFL_MAP_SIZE")) || (ptr = getenv("AFL_MAPSIZE"))) { if ((ptr = getenv("AFL_MAP_SIZE")) || (ptr = getenv("AFL_MAPSIZE"))) {

24
src/afl-fuzz.c
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@ -1527,11 +1527,13 @@ int main(int argc, char **argv_orig, char **envp) {
if (!afl->non_instrumented_mode && !afl->fsrv.qemu_mode && if (!afl->non_instrumented_mode && !afl->fsrv.qemu_mode &&
!afl->unicorn_mode) { !afl->unicorn_mode) {
if (map_size <= 8000000 && !afl->non_instrumented_mode && if (map_size <= DEFAULT_SHMEM_SIZE && !afl->non_instrumented_mode &&
!afl->fsrv.qemu_mode && !afl->unicorn_mode) { !afl->fsrv.qemu_mode && !afl->unicorn_mode) {
afl->fsrv.map_size = 8000000; // dummy temporary value afl->fsrv.map_size = DEFAULT_SHMEM_SIZE; // dummy temporary value
setenv("AFL_MAP_SIZE", "8000000", 1); char vbuf[16];
snprintf(vbuf, sizeof(vbuf), "%u", DEFAULT_SHMEM_SIZE);
setenv("AFL_MAP_SIZE", vbuf, 1);
} }
@ -1582,11 +1584,13 @@ int main(int argc, char **argv_orig, char **envp) {
afl->cmplog_fsrv.cmplog_binary = afl->cmplog_binary; afl->cmplog_fsrv.cmplog_binary = afl->cmplog_binary;
afl->cmplog_fsrv.init_child_func = cmplog_exec_child; afl->cmplog_fsrv.init_child_func = cmplog_exec_child;
if (map_size <= 8000000 && !afl->non_instrumented_mode && if (map_size <= DEFAULT_SHMEM_SIZE && !afl->non_instrumented_mode &&
!afl->fsrv.qemu_mode && !afl->unicorn_mode) { !afl->fsrv.qemu_mode && !afl->unicorn_mode) {
afl->cmplog_fsrv.map_size = 8000000; // dummy temporary value afl->fsrv.map_size = DEFAULT_SHMEM_SIZE; // dummy temporary value
setenv("AFL_MAP_SIZE", "8000000", 1); char vbuf[16];
snprintf(vbuf, sizeof(vbuf), "%u", DEFAULT_SHMEM_SIZE);
setenv("AFL_MAP_SIZE", vbuf, 1);
} }
@ -1634,8 +1638,12 @@ int main(int argc, char **argv_orig, char **envp) {
} }
if (afl->debug) { if (afl->debug) {
printf("NORMAL %u, CMPLOG %u\n", afl->fsrv.map_size, afl->cmplog_fsrv.map_size);
fprintf(stderr, "NORMAL %u, CMPLOG %u\n", afl->fsrv.map_size, afl->cmplog_fsrv.map_size); printf("NORMAL %u, CMPLOG %u\n", afl->fsrv.map_size,
afl->cmplog_fsrv.map_size);
fprintf(stderr, "NORMAL %u, CMPLOG %u\n", afl->fsrv.map_size,
afl->cmplog_fsrv.map_size);
} }
load_auto(afl); load_auto(afl);