tree cde99b4c93067f6d1a6e1bd5f89c5654a73149db
parent 5196f10191bd3c826f8aee59ef8f7e4083062639
author Mitch Phillips <mitchp@google.com> 1578552758 -0800
committer Mitch Phillips <mitchp@google.com> 1578616716 -0800

Allow heap tags in libmemunreachable

Fixes libmemunreachable to allow for heap tagging. We now explicitly
untag any pointers returned by malloc_iterate. Similarly - when
traversing memory word-by-word to look for known pointers, we
strip the pointer tag.

We may have mixed tagged and untagged heap pointers if the zygote
disables heap tagging due to compat reasons. This change should allow us
to gracefully handle this case as well.

Test: memunreachable_test memunreachable_unit_test
Bug: 135754954
Change-Id: I817d67aa16377f0f4c50c72f4b67f87978cbd25a