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Title: gh-150587: Harden BINARY_OP_SUBSCR_LIST_INT/STORE_SUBSCR_LIST_INT against non-compact int subscripts by KRRT7 · Pull Request #150588 · python/cpython · GitHub

Open Graph Title: gh-150587: Harden BINARY_OP_SUBSCR_LIST_INT/STORE_SUBSCR_LIST_INT against non-compact int subscripts by KRRT7 · Pull Request #150588 · python/cpython

X Title: gh-150587: Harden BINARY_OP_SUBSCR_LIST_INT/STORE_SUBSCR_LIST_INT against non-compact int subscripts by KRRT7 · Pull Request #150588 · python/cpython

Description: Add EXIT_IF(!_PyLong_IsNonNegativeCompact(...)) to _BINARY_OP_SUBSCR_LIST_INT and DEOPT_IF(!_PyLong_IsNonNegativeCompact(...)) to _STORE_SUBSCR_LIST_INT before the _PyLong_CompactValue call. Both opcodes currently rely on _GUARD_TOS_INT having already rejected non-compact ints, but do not enforce this themselves. If _GUARD_TOS_INT were relaxed, _PyLong_CompactValue would be called on a wide int, silently reading ob_digit[0] as the index instead of the full value. Fixes gh-150587.

Open Graph Description: Add EXIT_IF(!_PyLong_IsNonNegativeCompact(...)) to _BINARY_OP_SUBSCR_LIST_INT and DEOPT_IF(!_PyLong_IsNonNegativeCompact(...)) to _STORE_SUBSCR_LIST_INT before the _PyLong_CompactValue call. Both o...

X Description: Add EXIT_IF(!_PyLong_IsNonNegativeCompact(...)) to _BINARY_OP_SUBSCR_LIST_INT and DEOPT_IF(!_PyLong_IsNonNegativeCompact(...)) to _STORE_SUBSCR_LIST_INT before the _PyLong_CompactValue call. Both o...

Opengraph URL: https://github.com/python/cpython/pull/150588

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