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gh-140815: Fix faulthandler for invalid/freed frame (#140921)

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faulthandler now detects if a frame or a code object is invalid or
freed.

Add helper functions:

* _PyCode_SafeAddr2Line()
* _PyFrame_SafeGetCode()
* _PyFrame_SafeGetLasti()

_PyMem_IsPtrFreed() now detects pointers in [-0xff, 0xff] range
as freed.
This commit is contained in:
Victor Stinner 2025-11-04 11:48:28 +01:00 • committed by GitHub
parent 08115d241a
commit a84181c31b
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GPG key ID: B5690EEEBB952194
6 changed files with 128 additions and 33 deletions
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10
Include/internal/pycore_pymem.h
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@ -54,15 +54,17 @@ static inline int _PyMem_IsPtrFreed(const void *ptr)
{
uintptr_t value = (uintptr_t)ptr;
#if SIZEOF_VOID_P == 8
return (value == 0
return (value <= 0xff // NULL, 0x1, 0x2, ..., 0xff
|| value == (uintptr_t)0xCDCDCDCDCDCDCDCD
|| value == (uintptr_t)0xDDDDDDDDDDDDDDDD
|| value == (uintptr_t)0xFDFDFDFDFDFDFDFD);
|| value == (uintptr_t)0xFDFDFDFDFDFDFDFD
|| value >= (uintptr_t)0xFFFFFFFFFFFFFF00); // -0xff, ..., -2, -1
#elif SIZEOF_VOID_P == 4
return (value == 0
return (value <= 0xff
|| value == (uintptr_t)0xCDCDCDCD
|| value == (uintptr_t)0xDDDDDDDD
|| value == (uintptr_t)0xFDFDFDFD);
|| value == (uintptr_t)0xFDFDFDFD
|| value >= (uintptr_t)0xFFFFFF00);
#else
# error "unknown pointer size"
#endif