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

Merged
merged 1 commit into from
May 23, 2024
Merged

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

merged 1 commit into from
May 23, 2024

Commits on May 23, 2024

  1. [scudo] Compute the default aligned pointer without tag 

    llvm#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'
    @ahomescu
    ahomescu committed May 23, 2024
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