[all-commits] [llvm/llvm-project] 4fa989: Fix TSAN signal interceptor out-of-bound access

[Shu-Chun Weng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4fa989c7b23c5d518fb381b4a292a00985cb8eec
      https://github.com/llvm/llvm-project/commit/4fa989c7b23c5d518fb381b4a292a00985cb8eec
  Author: Shu-Chun Weng <scw at google.com>
  Date:   2021-07-22 (Thu, 22 Jul 2021)

  Changed paths:
    M compiler-rt/lib/msan/msan_interceptors.cpp
    M compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
    A compiler-rt/test/sanitizer_common/TestCases/Posix/signal.cpp

  Log Message:
  -----------
  Fix TSAN signal interceptor out-of-bound access

signal(2) and sigaction(2) have defined behaviors for invalid signal number
(EINVAL) and some programs rely on it.

The added test case also reveals that MSAN is too strict in this regard.

Test case passed on x86_64 Linux and AArch64 Linux.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D106468