[all-commits] [llvm/llvm-project] ac0f64: [runtimes][PAC] Harden unwinding when possible (#1...

[Oliver Hunt via All-commits]

  Branch: refs/heads/users/ojhunt/pointer-authenticated-unwinding
  Home:   https://github.com/llvm/llvm-project
  Commit: ac0f642c182ffa0b33d22b83b3f4482127ddcb4b
      https://github.com/llvm/llvm-project/commit/ac0f642c182ffa0b33d22b83b3f4482127ddcb4b
  Author: Oliver Hunt <oliver at apple.com>
  Date:   2025-08-05 (Tue, 05 Aug 2025)

  Changed paths:
    M compiler-rt/lib/builtins/gcc_personality_v0.c
    M compiler-rt/lib/profile/InstrProfilingValue.c
    M libcxxabi/include/__cxxabi_config.h
    M libcxxabi/src/cxa_exception.h
    M libcxxabi/src/cxa_personality.cpp
    M libunwind/include/libunwind.h
    M libunwind/src/AddressSpace.hpp
    M libunwind/src/CompactUnwinder.hpp
    M libunwind/src/DwarfInstructions.hpp
    M libunwind/src/DwarfParser.hpp
    M libunwind/src/Registers.hpp
    M libunwind/src/UnwindCursor.hpp
    M libunwind/src/UnwindLevel1.c
    M libunwind/src/UnwindRegistersRestore.S
    M libunwind/src/UnwindRegistersSave.S
    M libunwind/src/libunwind.cpp

  Log Message:
  -----------
  [runtimes][PAC] Harden unwinding when possible (#138571)

This hardens the unwinding logic and datastructures on systems
that support pointer authentication.
The approach taken to hardening is to harden the schemas of as many
high value fields in the myriad structs as possible, and then also
explicitly qualify local variables referencing privileged or security
critical values.
This does introduce ABI linkage between libcxx, libcxxabi, and
libunwind but those are in principle separate from the OS itself
so we've kept the schema definitions in the library specific headers
rather than ptrauth.h



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