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Previously we would rely on implicit re-raising to deliver signals to the underlying handler on POSIX systems if the signal is detected as being re-raisable via WillSignalReraiseAutonomously(). This detection mechanism is imperfect, as it will misclassify signals delivered as a result of kill(2) when passing a signal number usually used for synchronous signals, but now also asynchronous MTE tag check faults, which are delivered as SIGSEGV signals on Linux. As a result, these signals would not be re-raised and therefore would be discarded. Although we could, for example, teach WillSignalReraiseAutonomously() about MTE faults, the signal would still be re-raised via raise(3) and therefore we would lose the information in siginfo. We can avoid discarding these signals on Linux while at the same time preserving the siginfo by making use of the syscall rt_tgsigqueueinfo(2) which delivers a signal together with a user-provided siginfo. The problem still exists on non-Linux POSIX systems because this syscall is Linux-specific. Change-Id: I6df58d9371e29f75e19b4f899b723d4047f12936 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3278691 Commit-Queue: Peter Collingbourne <pcc@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>
Crashpad
Crashpad is a crash-reporting system.
Documentation
- Project status
- Developing Crashpad: instructions for getting the source code, building, testing, and contributing to the project.
- Crashpad interface documentation
- Crashpad tool man pages
- Crashpad overview design
Source Code
Crashpad’s source code is hosted in a Git repository at https://chromium.googlesource.com/crashpad/crashpad.
Other Links
- Bugs can be reported at the Crashpad issue tracker.
- The Crashpad bots perform automated builds and tests.
- crashpad-dev is the Crashpad developers’ mailing list.