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Implement use-after-free detection using junk and stash.

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On deallocation, sampled pointers (specially aligned) get junked and stashed
into tcache (to prevent immediate reuse).  The expected behavior is to have
read-after-free corrupted and stopped by the junk-filling, while
write-after-free is checked when flushing the stashed pointers.
This commit is contained in:
Qi Wang 2021-10-18 17:33:15 -07:00 • committed by Qi Wang
parent 06aac61c4b
commit b75822bc6e
22 changed files with 793 additions and 42 deletions
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2
src/arena.c
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@ -157,6 +157,8 @@ arena_stats_merge(tsdn_t *tsdn, arena_t *arena, unsigned *nthreads,
cache_bin_t *cache_bin = &descriptor->bins[i];
astats->tcache_bytes +=
cache_bin_ncached_get_remote(cache_bin,
&tcache_bin_info[i]) * sz_index2size(i) +
cache_bin_nstashed_get(cache_bin,
&tcache_bin_info[i]) * sz_index2size(i);
}
}