[all-commits] [llvm/llvm-project] 4f029d: [GWP-ASan] Split the unwinder into segv/non-segv.

[Mitch Phillips via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 4f029d1be4e19270416637327f56668744e64b5c
      https://github.com/llvm/llvm-project/commit/4f029d1be4e19270416637327f56668744e64b5c
  Author: Mitch Phillips <31459023+hctim at users.noreply.github.com>
  Date:   2020-07-21 (Tue, 21 Jul 2020)

  Changed paths:
    M compiler-rt/lib/gwp_asan/CMakeLists.txt
    M compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp
    M compiler-rt/lib/gwp_asan/optional/backtrace_sanitizer_common.cpp
    M compiler-rt/lib/gwp_asan/optional/segv_handler.h
    M compiler-rt/lib/gwp_asan/optional/segv_handler_posix.cpp
    M compiler-rt/lib/gwp_asan/tests/CMakeLists.txt
    M compiler-rt/lib/gwp_asan/tests/harness.h
    M compiler-rt/lib/scudo/scudo_allocator.cpp
    M compiler-rt/lib/scudo/standalone/combined.h
    A compiler-rt/test/gwp_asan/backtrace.c

  Log Message:
  -----------
  [GWP-ASan] Split the unwinder into segv/non-segv.

Note: Resubmission with frame pointers force-enabled to fix builds with
-DCOMPILER_RT_BUILD_BUILTINS=False

Summary:
Splits the unwinder into a non-segv (for allocation/deallocation traces) and a
segv unwinder. This ensures that implementations can select an accurate, slower
unwinder in the segv handler (if they choose to use the GWP-ASan provided one).
This is important as fast frame-pointer unwinders (like the sanitizer unwinder)
don't like unwinding through signal handlers.

Reviewers: morehouse, cryptoad

Reviewed By: morehouse, cryptoad

Subscribers: cryptoad, mgorny, eugenis, pcc, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D83994