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gh-159739: Handle overlapping buffers in struct.pack_into - #159985
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JelleZijlstra merged 1 commit intoOct 21, 2026
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Backport to 3.15 and 3.14.
JelleZijlstra
enabled auto-merge (squash)
October 21, 2026 18:47
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-160101 is a backport of this pull request to the 3.15 branch. |
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Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to 3.14 due to a conflict. Please backport manually with cherry_picker, see the devguide for more information. cherry_picker 31a7d994a559a421814ca9e8edfcab21ae4a5b36 3.14 |
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Handle overlapping buffers in struct.pack_into. 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.
Backport to 3.15 and 3.14.