[5.8][Runtime] Fix key paths on 32-bit with KVC string pointers in the top half of memory. #63308
Conversation
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
…e top half of memory. Key paths can store an offset or a pointer in the same field. On 32-bit, the field is considered to be an offset when it's less than the 4kB zero page, and a pointer otherwise. The check uses a signed comparison, so pointers in the top half of memory would look like negative offsets. Add a check that the offset is zero or positive to avoid this. rdar://103886537 (cherry picked from commit 1f8acac)
|
@swift-ci please test |
tbkka
approved these changes
Jan 30, 2023
|
@swift-ci please test macos platform |
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Outdated suggestions cannot be applied.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.
Cherry-pick #63302 to
release/5.8.Key paths can store an offset or a pointer in the same field. On 32-bit, the field is considered to be an offset when it's less than the 4kB zero page, and a pointer otherwise.
The check uses a signed comparison, so pointers in the top half of memory would look like negative offsets. Add a check that the offset is zero or positive to avoid this.
rdar://103886537