[all-commits] [llvm/llvm-project] c378bb: CodeGen: Optionally emit PAuth relocations as IREL...

[Peter Collingbourne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c378bb135455787a5d8b1f4da5d3522a3e6a60b9
      https://github.com/llvm/llvm-project/commit/c378bb135455787a5d8b1f4da5d3522a3e6a60b9
  Author: Peter Collingbourne <pcc at google.com>
  Date:   2025-11-26 (Wed, 26 Nov 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
    A llvm/test/CodeGen/AArch64/ptrauth-irelative.ll
    M llvm/test/CodeGen/AArch64/ptrauth-type-info-vptr-discr.ll

  Log Message:
  -----------
  CodeGen: Optionally emit PAuth relocations as IRELATIVE relocations.

This supports the following use cases:
- ConstantPtrAuth expressions that are unrepresentable using standard PAuth
  relocations such as expressions involving an integer operand or
  deactivation symbols.
- libc implementations that do not support PAuth relocations.

For more information see the RFC:
https://discourse.llvm.org/t/rfc-structure-protection-a-family-of-uaf-mitigation-techniques/85555

Reviewers: MaskRay, fmayer, smithp35, kovdan01

Reviewed By: fmayer

Pull Request: https://github.com/llvm/llvm-project/pull/133533



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