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gh-148850: Fix memory sanitizer false positive in os.getrandom #148851

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gh-148850: Fix memory sanitizer false positive in os.getrandom #148851

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gh-148850: Fix msan false positive in os.getrandom
petervanvugt Apr 21, 2026
ca5db2b
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 21, 2026
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-04-21-19-29-29.gh-issue-148850.MSH0J_.rst
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@@ -0,0 +1 @@
Fix the memory sanitizer false positive in :func:`os.getrandom`.
4 changes: 4 additions & 0 deletions Modules/posixmodule.c
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Expand Up @@ -17195,6 +17195,10 @@ os_getrandom_impl(PyObject *module, Py_ssize_t size, int flags)
goto error;
}

#ifdef _Py_MEMORY_SANITIZER
__msan_unpoison(data, size);
#endif

return PyBytesWriter_FinishWithSize(writer, n);

error:
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