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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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6 changed files with 128 additions and 33 deletions
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9
Include/internal/pycore_code.h
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@ -274,8 +274,13 @@ extern void _PyLineTable_InitAddressRange(
/** API for traversing the line number table. */
PyAPI_FUNC(int) _PyLineTable_NextAddressRange(PyCodeAddressRange *range);
extern int _PyLineTable_PreviousAddressRange(PyCodeAddressRange *range);
// This is used in dump_frame() in traceback.c without an attached tstate.
extern int _PyCode_Addr2LineNoTstate(PyCodeObject *co, int addr);
// Similar to PyCode_Addr2Line(), but return -1 if the code object is invalid
// and can be called without an attached tstate. Used by dump_frame() in
// Python/traceback.c. The function uses heuristics to detect freed memory,
// it's not 100% reliable.
extern int _PyCode_SafeAddr2Line(PyCodeObject *co, int addr);
/** API for executors */
extern void _PyCode_Clear_Executors(PyCodeObject *code);