[all-commits] [llvm/llvm-project] 32bada: [lsan] Fix stack buffer overwrite in SuspendedThre...

[Kuba (Brecka) Mracek via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 32bada2edaf8a6ecb515925dda5e736783f5d8eb
      https://github.com/llvm/llvm-project/commit/32bada2edaf8a6ecb515925dda5e736783f5d8eb
  Author: Kuba Mracek <mracek at apple.com>
  Date:   2022-11-12 (Sat, 12 Nov 2022)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_mac.cpp

  Log Message:
  -----------
  [lsan] Fix stack buffer overwrite in SuspendedThreadsListMac::GetRegistersAndSP

The call to the thread_get_state syscall (that fetches the register values for a thread) on arm64 is mistakenly claiming that the buffer to receive the register state is larger that its actual size on the stack -- the struct on the stack is arm_thread_state64_t, but the MACHINE_THREAD_STATE + MACHINE_THREAD_STATE_COUNT refer to the "unified arm state" struct (which is larger).

Fixes https://github.com/llvm/llvm-project/issues/58503.

Differential Revision: https://reviews.llvm.org/D137292