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gh-159739: Protect list storage while reporting its size - #160196
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JelleZijlstra merged 1 commit intoOct 22, 2026
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On free-threaded builds, list.__sizeof__() reads an allocation header through an atomically loaded storage pointer. The list's owner can resize and free that storage between the load and the header read, producing invalid size data or an invalid memory read. Hold the list lock while inspecting the allocation. Backport to 3.15 and 3.14.
JelleZijlstra
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October 22, 2026 21:15
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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-160363 is a backport of this pull request to the 3.15 branch. |
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GH-160364 is a backport of this pull request to the 3.14 branch. |
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JelleZijlstra
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…60196) (#160364) On free-threaded builds, list.__sizeof__() reads an allocation header through an atomically loaded storage pointer. The list's owner can resize and free that storage between the load and the header read, producing invalid size data or an invalid memory read. Hold the list lock while inspecting the allocation. Backport to 3.15 and 3.14. (cherry picked from commit d98f2cb) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
JelleZijlstra
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Oct 22, 2026
…60196) (#160363) On free-threaded builds, list.__sizeof__() reads an allocation header through an atomically loaded storage pointer. The list's owner can resize and free that storage between the load and the header read, producing invalid size data or an invalid memory read. Hold the list lock while inspecting the allocation. Backport to 3.15 and 3.14. (cherry picked from commit d98f2cb) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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On free-threaded builds, list.sizeof() reads an allocation header through an atomically loaded storage pointer. The list's owner can resize and free that storage between the load and the header read, producing invalid size data or an invalid memory read. Hold the list lock while inspecting the allocation. Backport to 3.15 and 3.14.