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GH-94262: Don't create frame objects for frames that aren't complete. #94371

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Merged
markshannon merged 11 commits into from
Jul 1, 2022
Merged

GH-94262: Don't create frame objects for frames that aren't complete. #94371

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87e97ae
Add test for creating frame object when making a generator.
markshannon Jun 27, 2022
583d164
Don't expose incomplete frames as frame objects.
markshannon Jun 27, 2022
5043a8b
Add news
markshannon Jun 28, 2022
e81c1f3
Cleanup after test.
markshannon Jun 28, 2022
6d07165
Explain _PyFrame_IsIncomplete()
markshannon Jun 28, 2022
ce0d4b5
Try harder to break things
markshannon Jun 28, 2022
f56451b
Avoid creating frame objects for incomplete frames vai f_back.
markshannon Jun 28, 2022
b69e803
Fix test
markshannon Jun 28, 2022
c648d46
Assert frame is valid when creating frame object.
markshannon Jun 28, 2022
cf0b32c
Prevent test polluting environment
markshannon Jun 28, 2022
939769c
Create all frames on stack from finalizer.
markshannon Jun 29, 2022
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Don't expose incomplete frames as frame objects.
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@markshannon
markshannon committed Jun 27, 2022
commit 583d16470101800ceac6fc73bb46f37dc853404b
7 changes: 7 additions & 0 deletions Include/internal/pycore_frame.h
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Expand Up @@ -210,6 +210,13 @@ PyGenObject *_PyFrame_GetGenerator(_PyInterpreterFrame *frame)
return (PyGenObject *)(((char *)frame) - offset_in_gen);
}


static inline bool
_PyFrame_IsIncomplete(_PyInterpreterFrame *frame)
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{
return frame->prev_instr < _PyCode_CODE(frame->f_code) + frame->f_code->_co_firsttraceable;
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}

#ifdef __cplusplus
}
#endif
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8 changes: 6 additions & 2 deletions Python/frame.c
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Expand Up @@ -68,9 +68,13 @@ take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame)
f->f_frame = frame;
frame->owner = FRAME_OWNED_BY_FRAME_OBJECT;
assert(f->f_back == NULL);
if (frame->previous != NULL) {
_PyInterpreterFrame *prev = frame->previous;
while (prev && _PyFrame_IsIncomplete(prev)) {
prev = prev->previous;
}
if (prev) {
/* Link PyFrameObjects.f_back and remove link through _PyInterpreterFrame.previous */
PyFrameObject *back = _PyFrame_GetFrameObject(frame->previous);
PyFrameObject *back = _PyFrame_GetFrameObject(prev);
if (back == NULL) {
/* Memory error here. */
assert(PyErr_ExceptionMatches(PyExc_MemoryError));
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14 changes: 11 additions & 3 deletions Python/sysmodule.c
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Expand Up @@ -1776,9 +1776,17 @@ sys__getframe_impl(PyObject *module, int depth)
return NULL;
}

while (depth > 0 && frame != NULL) {
frame = frame->previous;
--depth;
if (frame != NULL) {
while (depth > 0) {
frame = frame->previous;
if (frame == NULL) {
break;
}
if (_PyFrame_IsIncomplete(frame)) {
continue;
}
--depth;
}
}
if (frame == NULL) {
_PyErr_SetString(tstate, PyExc_ValueError,
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