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[3.13] gh-140815: Fix faulthandler for invalid/freed frame (#140921) (#140985)

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

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.

(cherry picked from commit a84181c31b)
This commit is contained in:
Victor Stinner 2025-11-05 18:39:28 +01:00 • committed by GitHub
parent 7ac9048ce9
commit 43882c7c4e
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6 changed files with 108 additions and 26 deletions
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17
Objects/codeobject.c
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@ -997,6 +997,23 @@ PyCode_Addr2Line(PyCodeObject *co, int addrq)
return _PyCode_CheckLineNumber(addrq, &bounds);
}
int
_PyCode_SafeAddr2Line(PyCodeObject *co, int addrq)
{
if (addrq < 0) {
return co->co_firstlineno;
}
if (co->_co_monitoring && co->_co_monitoring->lines) {
return _Py_Instrumentation_GetLine(co, addrq/sizeof(_Py_CODEUNIT));
}
if (!(addrq >= 0 && addrq < _PyCode_NBYTES(co))) {
return -1;
}
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(co, &bounds);
return _PyCode_CheckLineNumber(addrq, &bounds);
}
void
_PyLineTable_InitAddressRange(const char *linetable, Py_ssize_t length, int firstlineno, PyCodeAddressRange *range)
{