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change queue cache algo

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This commit is contained in:
van Hauser 2020-10-22 15:48:09 +02:00
parent 982260c134
commit 8d75c08938
1 changed files with 21 additions and 7 deletions
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22
src/afl-fuzz-queue.c
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@ -913,7 +913,7 @@ inline void queue_testcase_retake_mem(afl_state_t *afl, struct queue_entry *q,
if (likely(q->testcase_buf)) {
if (len != old_len) {
if (likely(len != old_len)) {
afl->q_testcase_cache_size = afl->q_testcase_cache_size + len - old_len;
q->testcase_buf = realloc(q->testcase_buf, len);
@ -976,17 +976,21 @@ inline u8 *queue_testcase_get(afl_state_t *afl, struct queue_entry *q) {
if (unlikely(!q->testcase_buf)) {
/* Buf not cached, let's load it */
u32 tid = 0;
u32 tid = afl->q_testcase_max_cache_count;
while (unlikely(afl->q_testcase_cache_size + len >=
afl->q_testcase_max_cache_size ||
afl->q_testcase_cache_count >= TESTCASE_ENTRIES - 1)) {
/* Cache full. We neet to evict one to map one.
/* Cache full. We neet to evict one or more to map one.
Get a random one which is not in use */
do {
// if the cache (MB) is not enough for the queue then this gets
// undesirable because q_testcase_max_cache_count grows sometimes
// although the number of items in the cache will not change hence
// more and more loops
tid = rand_below(afl, afl->q_testcase_max_cache_count);
} while (afl->q_testcase_cache[tid] == NULL ||
@ -1003,7 +1007,16 @@ inline u8 *queue_testcase_get(afl_state_t *afl, struct queue_entry *q) {
}
while (likely(afl->q_testcase_cache[tid] != NULL))
if (tid >= TESTCASE_ENTRIES) {
// uh we were full, so now we have to search from start
tid = 0;
}
// we need this while loop in case there were ever previous evictions but
// not in this call.
while (unlikely(afl->q_testcase_cache[tid] != NULL))
++tid;
/* Map the test case into memory. */
@ -1047,6 +1060,7 @@ inline void queue_testcase_store_mem(afl_state_t *afl, struct queue_entry *q,
afl->q_testcase_max_cache_size ||
afl->q_testcase_cache_count >= TESTCASE_ENTRIES - 1)) {
// no space? will be loaded regularly later.
return;
}