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gh-148286: Fix undefined behaviour in the ctypes bit field accessors #154912

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gh-148286: Fix undefined behaviour in the ctypes bit field accessors #154912

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gh-148286: Fix undefined behaviour in the ctypes bit field accessors
matthiasgoergens Jul 30, 2026
e291f3b
Trim the NEWS entry to the user-visible statement
matthiasgoergens Aug 1, 2026
58d58b0
Merge branch 'main' into ctypes-bitfield-ub
matthiasgoergens Oct 21, 2026
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Trim the NEWS entry to the user-visible statement 
Review feedback from StanFromIreland: no implementation details (the
BIT_MASK macro name is meaningless to users), no description of how it
was fixed (the diff carries that), and no note about the suppressions
file.
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@matthiasgoergens
matthiasgoergens committed Aug 1, 2026
commit e291f3bc79ec7f35587dfb1aedeed640836429d1
9 changes: 2 additions & 7 deletions Misc/NEWS.d/next/Library/2026-07-30-12-00-00.gh-issue-148286.Kx7Qm2.rst
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@@ -1,7 +1,2 @@
Fix undefined behaviour in the :mod:`ctypes` bit field accessors. The
``BIT_MASK``, ``GET_BITFIELD`` and ``SET`` macros in
``Modules/_ctypes/cfield.c`` shifted negative values left and shifted ones
into the sign bit of a signed type. The bit manipulation is now done in
``uint64_t`` and converted back to the field's own type, which removes the
two ``Modules/_ctypes/cfield.c`` entries from
``Tools/ubsan/suppressions.txt``.
Fix undefined behaviour when reading and writing :mod:`ctypes` bit fields of
a signed type.
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