Fix undefined behaviour when writing 32-bit values in phar/tar.c #10940
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
As shown on the CI runs on my fork (which runs with UBSAN), the pointers can sometimes be unaligned when trying to write. This is UB and on platforms like ARM this *can* result in a bus error. Replace it with memcpy, which at least on x86 and powerpc architectures does result in the same assembly code.
Girgias
approved these changes
Mar 26, 2023
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.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.
As shown on the CI runs on my fork (which runs with UBSAN), the pointers can sometimes be unaligned when trying to write. This is UB and on platforms like ARM this can result in a bus error. Replace it with memcpy, which at least on x86 and powerpc architectures does result in the same assembly code.