[all-commits] [llvm/llvm-project] 1e09db: [asan] Fix stack-use-after-free checks on non-main...

[Drew Fisher via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1e09dbb6a942ec5558dc84b5dbc8a842891135d4
      https://github.com/llvm/llvm-project/commit/1e09dbb6a942ec5558dc84b5dbc8a842891135d4
  Author: Drew Fisher <zarvox at google.com>
  Date:   2020-10-24 (Sat, 24 Oct 2020)

  Changed paths:
    M compiler-rt/lib/asan/asan_thread.cpp

  Log Message:
  -----------
  [asan] Fix stack-use-after-free checks on non-main thread on Fuchsia

While some platforms call `AsanThread::Init()` from the context of the
thread being started, others (like Fuchsia) call `AsanThread::Init()`
from the context of the thread spawning a child.  Since
`AsyncSignalSafeLazyInitFakeStack` writes to a thread-local, we need to
avoid calling it from the spawning thread on Fuchsia.  Skipping the call
here on Fuchsia is fine; it'll get called from the new thread lazily on first
attempted access.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D89607