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Fix missed updates of alias table when INTROSPECTION is on

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In src/afl-fuzz.c `prev_queued_items` is used to decide whether the alias table should be recreated through the comparison with `afl->queued_items`.
43f462c91b/src/afl-fuzz.c (L3103-L3117)

However, this variable is also updated to `afl->queued_items` when INTROSPECTION is enabled and the `fuzz_one` appends seeds.
43f462c91b/src/afl-fuzz.c (L3135-L3140)

Due to the update of `prev_queued_items` when INTROSPECTION is on, alias table may not be recreated when it actually should be.

This can lead to potential heap buffer-overflow in `select_next_queue_entry` due to the lack of `afl_realloc` called in `create_alias_table`.

This patch fixes this bug by utilizing another variable for the INTROSPECTION part like other variables such as `prev_saved_tmouts`.
This commit is contained in:
Takuya Shimizu
2024-07-10 21:39:04 +09:00
parent 43f462c91b
commit 02f4f75526
1 changed files with 5 additions and 4 deletions
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9
src/afl-fuzz.c
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@ -2815,7 +2815,7 @@ int main(int argc, char **argv_orig, char **envp) {
// (void)nice(-20); // does not improve the speed
#ifdef INTROSPECTION
u32 prev_saved_crashes = 0, prev_saved_tmouts = 0;
u32 prev_saved_crashes = 0, prev_saved_tmouts = 0, stat_prev_queued_items = 0;
#endif
u32 prev_queued_items = 0, runs_in_current_cycle = (u32)-1;
u8 skipped_fuzz;
@ -3132,10 +3132,11 @@ int main(int argc, char **argv_orig, char **envp) {
} else {
if (unlikely(afl->queued_items > prev_queued_items)) {
if (unlikely(afl->queued_items > stat_prev_queued_items)) {
afl->queue_cur->stats_finds += afl->queued_items - prev_queued_items;
prev_queued_items = afl->queued_items;
afl->queue_cur->stats_finds +=
afl->queued_items - stat_prev_queued_items;
stat_prev_queued_items = afl->queued_items;
}