Repository navigation
[3.15] gh-159739: Handle overlapping buffers in struct.pack_into (GH-159985) - #160101
Merged
Merged
Conversation
…onGH-159985) `struct.pack_into()` can use the same bytearray as both the destination and an `s` or `p` value. The copy then passes overlapping regions to `memcpy`, which is undefined in C and can produce platform-dependent results or a sanitizer abort. `memmove` makes the overlapping copy defined. (cherry picked from commit 31a7d99) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
This was referenced Oct 21, 2026
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
3 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
struct.pack_into()can use the same bytearray as both the destination and ansorpvalue. The copy then passes overlapping regions tomemcpy, which is undefined in C and can produce platform-dependent results or a sanitizer abort.memmovemakes the overlapping copy defined.(cherry picked from commit 31a7d99)
Co-authored-by: Jelle Zijlstra jelle@openai.com