[all-commits] [llvm/llvm-project] 966386: [compiler-rt][hwasan] Setup hwasan thread handling...

[Leonard Chan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 966386514bec9366ca85d1599f4c866eee9f1927
      https://github.com/llvm/llvm-project/commit/966386514bec9366ca85d1599f4c866eee9f1927
  Author: Leonard Chan <leonardchan at google.com>
  Date:   2021-07-07 (Wed, 07 Jul 2021)

  Changed paths:
    M compiler-rt/lib/hwasan/CMakeLists.txt
    A compiler-rt/lib/hwasan/hwasan_fuchsia.cpp
    M compiler-rt/lib/hwasan/hwasan_thread.cpp

  Log Message:
  -----------
  [compiler-rt][hwasan] Setup hwasan thread handling on Fuchsia

This patch splits up hwasan thread creation between `__sanitizer_before_thread_create_hook`,
`__sanitizer_thread_create_hook`, and `__sanitizer_thread_start_hook`.
The linux implementation creates the hwasan thread object inside the
new thread. On Fuchsia, we know the stack bounds before thread creation,
so we can initialize part of the thread object in `__sanitizer_before_thread_create_hook`,
then initialize the stack ring buffer in `__sanitizer_thread_start_hook`
once we enter the thread.

Differential Revision: https://reviews.llvm.org/D104085