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scudo: Exclude previous tag when retagging freed memory.

Authored by pcc on Apr 30 2020, 4:42 PM.

Description

scudo: Exclude previous tag when retagging freed memory.

This means that immediate use after free will be detected 100% of
the time.

Differential Revision: https://reviews.llvm.org/D79216

Details

Committed
pccMay 1 2020, 9:35 AM
Differential Revision
D79216: scudo: Exclude previous tag when retagging freed memory.
Parents
rG081dbd61db8a: [NFC] Try to fix test due asan failure
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