crashpad/handler/win/wer/crashpad_wer.ver

INTERNAL_NAME=crashpad_wer
ORIGINAL_FILENAME=crashpad_wer.dll
Add WER runtime exception helper module for Windows This adds a runtime exception helper (& test module) for Windows and plumbing to allow the module to be registered by the crashpad client, and to trigger the crashpad handler. Embedders can build their own module to control which exceptions are passed to the handler. See: go/chrome-windows-runtime-exception-helper for motivation. When registered (which is the responsibility of the embedding application), the helper is loaded by WerFault.exe when Windows Error Reporting receives crashes that are not caught by crashpad's normal handlers - for instance a control-flow violation when a module is compiled with /guard:cf. Registration: The embedder must arrange for the full path to the helper to be added in the appropriate Windows Error Reporting\ RuntimeExceptionHelperModules registry key. Once an embedder's crashpad client is connected to a crashpad handler (e.g. through SetIpcPipeName()) the embedder calls RegisterWerModule. Internally, this registration includes handles used to trigger the crashpad handler, an area reserved to hold an exception and context, and structures needed by the crashpad handler. Following a crash: WerFault.exe handles the crash then validates and loads the helper module. WER hands the helper module a handle to the crashing target process and copies of the exception and context for the faulting thread. The helper then copies out the client's registration data and duplicates handles to the crashpad handler, then fills back the various structures in the paused client that the crashpad handler will need. The helper then signals the crashpad handler, which collects a dump then notifies the helper that it is done. Support: WerRegisterExceptionHelperModule has been availble since at least Windows 7 but WerFault would not pass on the exceptions that crashpad could not already handle. This changed in Windows 10 20H1 (19041), which supports HKCU and HKLM registrations, and passes in more types of crashes. It is harmless to register the module for earlier versions of Windows as it simply won't be loaded by WerFault.exe. Tests: snapshot/win/end_to_end_test.py has been refactored slightly to group crash generation and output validation in main() by breaking up RunTests into smaller functions. As the module works by being loaded in WerFault.exe it is tested in end_to_end_test.py. Bug: crashpad:133, 866033, 865632 Change-Id: Id668bd15a510a24c79753e1bb03e9456f41a9780 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3677284 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Alex Gough <ajgo@chromium.org> 2022-07-06 13:53:12 -07:00			`INTERNAL_NAME=crashpad_wer`
			`ORIGINAL_FILENAME=crashpad_wer.dll`