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[3.13] gh-130163: Fix crashes related to PySys_GetObject() (GH-130503) (GH-130556)

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The use of PySys_GetObject() and _PySys_GetAttr(), which return a borrowed
reference, has been replaced by using one of the following functions, which
return a strong reference and distinguish a missing attribute from an error:
_PySys_GetOptionalAttr(), _PySys_GetOptionalAttrString(),
_PySys_GetRequiredAttr(), and _PySys_GetRequiredAttrString().
(cherry picked from commit 0ef4ffeefd)
This commit is contained in:
Serhiy Storchaka 2025-02-26 00:50:26 +02:00 • committed by GitHub
parent b0d3f49195
commit 7c1b76fce8
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GPG key ID: B5690EEEBB952194
23 changed files with 505 additions and 180 deletions
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19
Python/traceback.c
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@ -12,7 +12,7 @@
#include "pycore_pyarena.h" // _PyArena_Free()
#include "pycore_pyerrors.h" // _PyErr_GetRaisedException()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_sysmodule.h" // _PySys_GetAttr()
#include "pycore_sysmodule.h" // _PySys_GetOptionalAttr()
#include "pycore_traceback.h" // EXCEPTION_TB_HEADER
#include "frameobject.h" // PyFrame_New()
@ -346,9 +346,13 @@ _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *
taillen = strlen(tail);
PyThreadState *tstate = _PyThreadState_GET();
syspath = _PySys_GetAttr(tstate, &_Py_ID(path));
if (syspath == NULL || !PyList_Check(syspath))
if (_PySys_GetOptionalAttr(&_Py_ID(path), &syspath) < 0) {
PyErr_Clear();
goto error;
}
if (syspath == NULL || !PyList_Check(syspath)) {
goto error;
}
npath = PyList_Size(syspath);
open = PyObject_GetAttr(io, &_Py_ID(open));
@ -391,6 +395,7 @@ error:
result = NULL;
finally:
Py_XDECREF(open);
Py_XDECREF(syspath);
Py_DECREF(filebytes);
return result;
}
@ -719,17 +724,21 @@ _PyTraceBack_Print(PyObject *v, const char *header, PyObject *f)
PyErr_BadInternalCall();
return -1;
}
limitv = PySys_GetObject("tracebacklimit");
if (limitv && PyLong_Check(limitv)) {
if (_PySys_GetOptionalAttrString("tracebacklimit", &limitv) < 0) {
return -1;
}
else if (limitv != NULL && PyLong_Check(limitv)) {
int overflow;
limit = PyLong_AsLongAndOverflow(limitv, &overflow);
if (overflow > 0) {
limit = LONG_MAX;
}
else if (limit <= 0) {
Py_DECREF(limitv);
return 0;
}
}
Py_XDECREF(limitv);
if (PyFile_WriteString(header, f) < 0) {
return -1;