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bpo-42990: Functions inherit current builtins (GH-24564)

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The types.FunctionType constructor now inherits the current builtins
if the globals dictionary has no "__builtins__" key, rather than
using {"None": None} as builtins: same behavior as eval() and exec()
functions.

Defining a function with "def function(...): ..." in Python is not
affected, globals cannot be overriden with this syntax: it also
inherits the current builtins.

PyFrame_New(), PyEval_EvalCode(), PyEval_EvalCodeEx(),
PyFunction_New() and PyFunction_NewWithQualName() now inherits the
current builtins namespace if the globals dictionary has no
"__builtins__" key.

* Add _PyEval_GetBuiltins() function.
* _PyEval_BuiltinsFromGlobals() now uses _PyEval_GetBuiltins() if
  builtins cannot be found in globals.
* Add tstate parameter to _PyEval_BuiltinsFromGlobals().
This commit is contained in:
Victor Stinner 2021-02-20 15:17:18 +01:00 • committed by GitHub
parent 4233ff3ee4
commit 46496f9d12
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 74 additions and 31 deletions
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8
Objects/funcobject.c
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@ -4,6 +4,7 @@
#include "Python.h"
#include "pycore_ceval.h" // _PyEval_BuiltinsFromGlobals()
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_pyerrors.h" // _PyErr_Occurred()
#include "structmember.h" // PyMemberDef
PyObject *
@ -13,6 +14,8 @@ PyFunction_NewWithQualName(PyObject *code, PyObject *globals, PyObject *qualname
assert(PyDict_Check(globals));
Py_INCREF(globals);
PyThreadState *tstate = _PyThreadState_GET();
PyCodeObject *code_obj = (PyCodeObject *)code;
Py_INCREF(code_obj);
@ -42,15 +45,16 @@ PyFunction_NewWithQualName(PyObject *code, PyObject *globals, PyObject *qualname
_Py_IDENTIFIER(__name__);
PyObject *module = _PyDict_GetItemIdWithError(globals, &PyId___name__);
PyObject *builtins = NULL;
if (module == NULL && PyErr_Occurred()) {
if (module == NULL && _PyErr_Occurred(tstate)) {
goto error;
}
Py_XINCREF(module);
builtins = _PyEval_BuiltinsFromGlobals(globals);
builtins = _PyEval_BuiltinsFromGlobals(tstate, globals);
if (builtins == NULL) {
goto error;
}
Py_INCREF(builtins);
PyFunctionObject *op = PyObject_GC_New(PyFunctionObject, &PyFunction_Type);
if (op == NULL) {