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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
test/unit/tcache_max.sh
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@ -1,3 +1,3 @@
#!/bin/sh
export MALLOC_CONF="tcache_max:1024"
export MALLOC_CONF="tcache_max:1024,lg_san_uaf_align:-1"