(PR from mainline) HashAllocator: poison freed blocks #384
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When the Click build is configured with the option --enable-hash-allocator-poisoning, this change will cause the HashAllocator to write a "poison" byte value to the block being returned to a HashAllocator pool. This ensures that when a stale reference to a freed block is followed, the code will be much less likely to interpret the block as a valid object or struct. In particular, pointer values will be non-NULL but bad, leading to immediate failure with a clear signature indicating the presence of a stale reference bug. Signed-off-by: Andy Heffernan <[email protected]>
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Pick-up a PR from mainline at kohler/click#366
When the Click build is configured with the option --enable-hash-allocator-poisoning, this change will cause the HashAllocator to write a "poison" byte value to the block being returned to a HashAllocator pool. This ensures that when a stale reference to a freed block is followed, the code will be much less likely to interpret the block as a valid object or struct. In particular, pointer values will be non-NULL but bad, leading to immediate failure with a clear signature indicating the presence of a stale reference bug.