bpo-36389: _PyObject_IsFreed() now also detects uninitialized memory #12770
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Replace _PyMem_IsFreed() function with _PyMem_IsPtrFreed() inline function. The function is now way more efficient, it became a simple comparison on integers, rather than a short loop. Add unit tests on _PyObject_IsFreed().
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Apr 11, 2019
…emory (GH-12770) (GH-12788) * bpo-36389: _PyObject_IsFreed() now also detects uninitialized memory (GH-12770) Replace _PyMem_IsFreed() function with _PyMem_IsPtrFreed() inline function. The function is now way more efficient, it became a simple comparison on integers, rather than a short loop. It detects also uninitialized bytes and "forbidden bytes" filled by debug hooks on memory allocators. Add unit tests on _PyObject_IsFreed(). (cherry picked from commit 2b00db6) * bpo-36389: Change PyMem_SetupDebugHooks() constants (GH-12782) Modify CLEANBYTE, DEADDYTE and FORBIDDENBYTE constants: use 0xCD, 0xDD and 0xFD, rather than 0xCB, 0xBB and 0xFB, to use the same byte patterns than Windows CRT debug malloc() and free(). (cherry picked from commit 4c409be)
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Replace _PyMem_IsFreed() function with _PyMem_IsPtrFreed() inline
function. The function is now way more efficient, it became a simple
comparison on integers, rather than a short loop.
https://bugs.python.org/issue36389