[release/9.0] Initialize managed and native values in the ICustomMarshaler marshaler to null when the other is null. #109096
Conversation
This file contains 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
![github-actions[bot]](https://avatars.githubusercontent.com/in/15368?s=60&v=4){kind=small}
dotnet-issue-labeler
bot
added
the
needs-area-label
AaronRobinsonMSFT
added
Servicing-consider
|
Tagging subscribers to this area: @dotnet/interop-contrib |
|
Removing servicing-consider until we have everything filled out and ready |
jeffschwMSFT
added
the
Servicing-consider
jeffschwMSFT
approved these changes
Oct 22, 2024
AaronRobinsonMSFT
approved these changes
Oct 22, 2024
rbhanda
added
Servicing-approved
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Outdated suggestions cannot be applied.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.
Backport of #109092 to release/9.0
/cc @jkoritzinsky
Customer Impact
Reported in #109033
User experience is uninitialized (or default initialized with a "random" sentinel) memory being passed to native code when the managed value is
null, leading to crashes in native code when usingMarshalAs(UnmanagedType.CustomMarshaler). Usage of this marshaler kind is relatively uncommon (not a default, explicitly opted in to), but for all usages, this case is likely to eventually show up.Regression
.NET 9 preview 2
Testing
Verified against the previous implementation.
Risk
Low. I've re-validated all of the code paths and their expected values against the previous implementation before the regression.