Fix Hermes crash from TurboModule void method NSException handling#56265
Closed
fabriziocucci wants to merge 1 commit intofacebook:mainfrom
Closed
Fix Hermes crash from TurboModule void method NSException handling#56265fabriziocucci wants to merge 1 commit intofacebook:mainfrom
fabriziocucci wants to merge 1 commit intofacebook:mainfrom
Conversation
Summary: When an async void TurboModule method throws an NSException, performVoidMethodInvocation calls convertNSExceptionToJSError which accesses the Hermes JSI runtime from the native method call invoker thread. Since jsi::Runtime is not thread-safe, this causes heap corruption and EXC_BAD_ACCESS crashes across various hermes::vm::* functions. The sibling function performMethodInvocation was already fixed in D71619229 to re-throw the ObjC exception instead of converting to JSError when the call is async. This applies the same fix to performVoidMethodInvocation, which is always async. Related to SEV S641230 (4,550+ Hermes crashes in AMA iOS from OTA bundle 921191722). A JS change behind a QE/MC gate is triggering an NSException in a void TurboModule method for non-employee users, and this bug turns that into widespread memory corruption. This fix prevents the crash, but the triggering diff and throwing TurboModule still need to be identified separately. Matches upstream GitHub issue: https://github.com/facebook/hermes/issues/1957Commits affecting the React Native open source repository must have a changelog entry in the commit summary. Every React Native release has almost 1000 commits, and manually categorizing these commits is very time consuming. --- Changelog: [iOS][Fixed] - Fix Hermes crash when async void TurboModule method throws NSException by re-throwing instead of converting to JSError on wrong thread Reviewed By: javache Differential Revision: D98660782
|
@fabriziocucci has exported this pull request. If you are a Meta employee, you can view the originating Diff in D98660782. |
Collaborator
|
This pull request was successfully merged by @fabriziocucci in 4083a6f When will my fix make it into a release? | How to file a pick request? |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary:
When an async void TurboModule method throws an NSException,
performVoidMethodInvocation calls convertNSExceptionToJSError which
accesses the Hermes JSI runtime from the native method call invoker
thread. Since jsi::Runtime is not thread-safe, this causes heap
corruption and EXC_BAD_ACCESS crashes across various hermes::vm::*
functions.
The sibling function performMethodInvocation was already fixed in
D71619229 to re-throw the ObjC exception instead of converting to
JSError when the call is async. This applies the same fix to
performVoidMethodInvocation, which is always async.
Related to SEV S641230 (4,550+ Hermes crashes in AMA iOS from OTA
bundle 921191722). A JS change behind a QE/MC gate is triggering an
NSException in a void TurboModule method for non-employee users, and
this bug turns that into widespread memory corruption. This fix
prevents the crash, but the triggering diff and throwing TurboModule
still need to be identified separately.
Matches upstream GitHub issue: https://github.com/facebook/hermes/issues/1957Commits affecting the React Native open source repository must have a changelog
entry in the commit summary. Every React Native release has almost 1000 commits,
and manually categorizing these commits is very time consuming.
Changelog:
[iOS][Fixed] - Fix Hermes crash when async void TurboModule method throws NSException by re-throwing instead of converting to JSError on wrong thread
Reviewed By: javache
Differential Revision: D98660782