mirror of https://github.com/python/cpython
gh-112716: Fix SystemError when __builtins__ is not a dict (GH-112770)
It was raised in two cases: * in the import statement when looking up __import__ * in pickling some builtin type when looking up built-ins iter, getattr, etc.
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@ -837,6 +837,32 @@ class BuiltinTest(unittest.TestCase):
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self.assertRaisesRegex(NameError, "name 'superglobal' is not defined",
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exec, code, {'__builtins__': customdict()})
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def test_eval_builtins_mapping(self):
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code = compile("superglobal", "test", "eval")
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# works correctly
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ns = {'__builtins__': types.MappingProxyType({'superglobal': 1})}
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self.assertEqual(eval(code, ns), 1)
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# custom builtins mapping is missing key
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ns = {'__builtins__': types.MappingProxyType({})}
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self.assertRaisesRegex(NameError, "name 'superglobal' is not defined",
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eval, code, ns)
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def test_exec_builtins_mapping_import(self):
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code = compile("import foo.bar", "test", "exec")
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ns = {'__builtins__': types.MappingProxyType({})}
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self.assertRaisesRegex(ImportError, "__import__ not found", exec, code, ns)
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ns = {'__builtins__': types.MappingProxyType({'__import__': lambda *args: args})}
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exec(code, ns)
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self.assertEqual(ns['foo'], ('foo.bar', ns, ns, None, 0))
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def test_eval_builtins_mapping_reduce(self):
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# list_iterator.__reduce__() calls _PyEval_GetBuiltin("iter")
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code = compile("x.__reduce__()", "test", "eval")
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ns = {'__builtins__': types.MappingProxyType({}), 'x': iter([1, 2])}
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self.assertRaisesRegex(AttributeError, "iter", eval, code, ns)
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ns = {'__builtins__': types.MappingProxyType({'iter': iter}), 'x': iter([1, 2])}
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self.assertEqual(eval(code, ns), (iter, ([1, 2],), 0))
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def test_exec_redirected(self):
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savestdout = sys.stdout
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sys.stdout = None # Whatever that cannot flush()
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@ -0,0 +1,2 @@
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Fix SystemError in the ``import`` statement and in ``__reduce__()`` methods
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of builtin types when ``__builtins__`` is not a dict.
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@ -2417,7 +2417,7 @@ PyObject *
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_PyEval_GetBuiltin(PyObject *name)
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{
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PyObject *attr;
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if (PyDict_GetItemRef(PyEval_GetBuiltins(), name, &attr) == 0) {
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if (PyMapping_GetOptionalItem(PyEval_GetBuiltins(), name, &attr) == 0) {
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PyErr_SetObject(PyExc_AttributeError, name);
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}
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return attr;
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@ -2570,7 +2570,7 @@ import_name(PyThreadState *tstate, _PyInterpreterFrame *frame,
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PyObject *name, PyObject *fromlist, PyObject *level)
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{
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PyObject *import_func;
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if (PyDict_GetItemRef(frame->f_builtins, &_Py_ID(__import__), &import_func) < 0) {
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if (PyMapping_GetOptionalItem(frame->f_builtins, &_Py_ID(__import__), &import_func) < 0) {
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return NULL;
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}
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if (import_func == NULL) {
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