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[3.11] gh-120384: gh-120298: Fix array-out-of-bounds & use after free list #121345

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@gpshead gpshead commented Jul 3, 2024

gh-120384: Fix array-out-of-bounds crash in list_ass_subscript (GH-120442) (cherry picked from commit 8334a1b in the 3.12 branch)

gh-120298: Fix use after free in list_richcompare.

pythonGH-120442) (python#120825)

pythongh-120384: Fix array-out-of-bounds crash in `list_ass_subscript` (pythonGH-120442)
(cherry picked from commit 8334a1b)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
@gpshead gpshead changed the title [3.11] gh-120384: Fix array-out-of-bounds crash in list_ass_subscript [3.11] gh-120384: gh-120298: Fix array-out-of-bounds & use after free list Jul 3, 2024
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gpshead commented Jul 3, 2024

For consideration as a security related backport. To trigger these, people already need the ability to run arbitrary Python code. So we don't consider this a vulnerability given the existing capabilities. But it could make the life of some projects built on top of Python a little better.

Such projects are already on undefined behavior grounds if they consider anything executing Python bytecode to not be able to escape that to begin with. Because CPython does not guarantee any such thing.

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Just commenting that I am happy to get this fix backported once it's reviewed and tested

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