[all-commits] [llvm/llvm-project] 511b8b: Normalize ptrauth handling in sanitizer runtime (#...

[Anton Korobeynikov via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 511b8b094dd89f826cc95b52a68804e68d854a10
      https://github.com/llvm/llvm-project/commit/511b8b094dd89f826cc95b52a68804e68d854a10
  Author: Anton Korobeynikov <anton at korobeynikov.info>
  Date:   2024-07-26 (Fri, 26 Jul 2024)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h

  Log Message:
  -----------
  Normalize ptrauth handling in sanitizer runtime (#100483)

1. Include `ptrauth.h` if `ptrauth_intrinsics` language feature is specified (per ptrauth spec, this is what enables `ptrauh.h` usage and functions like `ptrauth_strip`)
 2. For PAC-RET fallback implement two changes:
    1. Switch to macro, so we can ignore key argument
    2. Ensure the unsigned value is erased from LR, so the possibility of gadget reuse is reduced.

Fixes #100467

(cherry picked from commit cc4f98979b079b517edd8a71f56a8975f436e63d)



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