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| author | Elliott Hughes <enh@google.com> | 2020-04-23 15:53:17 -0700 |
|---|---|---|
| committer | Elliott Hughes <enh@google.com> | 2020-04-24 08:59:35 -0700 |
| commit | 95cebe5b11a92e4431304a4553d96bfb6b5365df (patch) | |
| tree | 7d4c68e785cd42e5346e104ae7bd525b738cab29 /libc/malloc_debug/malloc_debug.cpp | |
| parent | 76eb84a4f4f101a11d6b8553ea71152d1c9ce731 (diff) | |
Block all signals in ScopedSignalBlocker.
When a thread calls pthread_exit(3), ScopedSignalBlocker blocks all
user-visible signals, but leaves internal-use signals 33/34/36/36/37.
Signal 33 is used to unwind a thread for a backtrace, which can cause us
to access the stack after it's been unmapped. (Avoiding this was the
reason why we have the ScopedSignalBlocker in pthread_exit(3)!)
Fix this (and other potential issues) by changing ScopedSignalBlocker to
call __rt_sigprocmask(2) directly, so we don't mask out the internal-use
signals.
Bug: https://issuetracker.google.com/153624226
Test: not trivially reproducible
Change-Id: I9b125ed41ddee4c5d33b45920f1d142e52db47cb
Merged-In: I9b125ed41ddee4c5d33b45920f1d142e52db47cb
Diffstat (limited to 'libc/malloc_debug/malloc_debug.cpp')
0 files changed, 0 insertions, 0 deletions