commit d3f967b6076d467b204dd23bf29bbc19996b9764
author Andrei Homescu <ahomescu@google.com> Thu May 23 10:08:05 2024 -0700
committer Copybara-Service <copybara-worker@google.com> Thu May 23 10:11:38 2024 -0700
tree dfa5b6d58e03d5d994acb59cb378a78713c160ea
parent 7fc80174e25e8bdb9b356de0eb56ddb7f6a7160a

[scudo] Compute the default aligned pointer without tag (#92989)

https://github.com/llvm/llvm-project/pull/83493 slightly
changed the order of computation of block addresses and
pointers, causing the value of DefaultAlignedPtr to
include the MTE tag. Move this computation earlier so it
matches the old behavior.

This fixes a UBSan failure in Trusty:
secure os: UBSan: (overflow:-)
external/scudo/standalone/combined.h:1070:35
secure os: Details: unsigned integer overflow: 8988807738704 -
144124176883594576 cannot be represented in type 'uptr'

GitOrigin-RevId: b17d44558ba4c30a3005089b334f68593d6a9c7c
Change-Id: Ie86f195d79144e0539684a71dbedaa0c8b961729