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GH-96975: Skip incomplete frames in PyEval_GetFrame (GH-97018) · python/cpython@6a646dd · GitHub

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Commit 6a646dd

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GH-96975: Skip incomplete frames in PyEval_GetFrame (GH-97018)
(cherry picked from commit 8fd2c3b) Co-authored-by: Brandt Bucher <brandtbucher@microsoft.com>
1 parent 773dbb9 commit 6a646dd

4 files changed

Lines changed: 79 additions & 3 deletions

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‎Lib/test/test_embed.py‎

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@@ -1709,6 +1709,9 @@ def test_audit_run_stdin(self):
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timeout=support.SHORT_TIMEOUT,
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returncode=1)
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def test_get_incomplete_frame(self):
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self.run_embedded_interpreter("test_get_incomplete_frame")
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class MiscTests(EmbeddingTestsMixin, unittest.TestCase):
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def test_unicode_id_init(self):

‎Misc/NEWS.d/next/Core and Builtins/2022-09-21-16-06-37.gh-issue-96975.BmE0XY.rst‎

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@@ -0,0 +1,2 @@
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Fix a crash occurring when :c:func:`PyEval_GetFrame` is called while the
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topmost Python frame is in a partially-initialized state.

‎Programs/_testembed.c‎

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@@ -1950,6 +1950,73 @@ static int test_repeated_init_and_inittab(void)
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return 0;
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}
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static void wrap_allocator(PyMemAllocatorEx *allocator);
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static void unwrap_allocator(PyMemAllocatorEx *allocator);
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static void *
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malloc_wrapper(void *ctx, size_t size)
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{
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PyMemAllocatorEx *allocator = (PyMemAllocatorEx *)ctx;
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unwrap_allocator(allocator);
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PyEval_GetFrame(); // BOOM!
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wrap_allocator(allocator);
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return allocator->malloc(allocator->ctx, size);
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}
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static void *
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calloc_wrapper(void *ctx, size_t nelem, size_t elsize)
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{
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PyMemAllocatorEx *allocator = (PyMemAllocatorEx *)ctx;
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return allocator->calloc(allocator->ctx, nelem, elsize);
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}
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static void *
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realloc_wrapper(void *ctx, void *ptr, size_t new_size)
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{
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PyMemAllocatorEx *allocator = (PyMemAllocatorEx *)ctx;
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return allocator->realloc(allocator->ctx, ptr, new_size);
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}
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static void
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free_wrapper(void *ctx, void *ptr)
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{
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PyMemAllocatorEx *allocator = (PyMemAllocatorEx *)ctx;
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allocator->free(allocator->ctx, ptr);
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}
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static void
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wrap_allocator(PyMemAllocatorEx *allocator)
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{
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PyMem_GetAllocator(PYMEM_DOMAIN_OBJ, allocator);
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PyMemAllocatorEx wrapper = {
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.malloc = &malloc_wrapper,
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.calloc = &calloc_wrapper,
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.realloc = &realloc_wrapper,
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.free = &free_wrapper,
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.ctx = allocator,
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};
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PyMem_SetAllocator(PYMEM_DOMAIN_OBJ, &wrapper);
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}
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static void
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unwrap_allocator(PyMemAllocatorEx *allocator)
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{
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PyMem_SetAllocator(PYMEM_DOMAIN_OBJ, allocator);
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}
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static int
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test_get_incomplete_frame(void)
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{
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_testembed_Py_Initialize();
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PyMemAllocatorEx allocator;
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wrap_allocator(&allocator);
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// Force an allocation with an incomplete (generator) frame:
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int result = PyRun_SimpleString("(_ for _ in ())");
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unwrap_allocator(&allocator);
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Py_Finalize();
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return result;
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}
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/* *********************************************************
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* List of test cases and the function that implements it.
@@ -2032,6 +2099,7 @@ static struct TestCase TestCases[] = {
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#ifndef MS_WINDOWS
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{"test_frozenmain", test_frozenmain},
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#endif
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{"test_get_incomplete_frame", test_get_incomplete_frame},
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{NULL, NULL}
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};

‎Python/ceval.c‎

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Original file line numberDiff line numberDiff line change
@@ -7116,11 +7116,14 @@ _PyEval_GetFrame(void)
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PyFrameObject *
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PyEval_GetFrame(void)
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{
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->cframe->current_frame == NULL) {
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_PyInterpreterFrame *frame = _PyEval_GetFrame();
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while (frame && _PyFrame_IsIncomplete(frame)) {
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frame = frame->previous;
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}
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if (frame == NULL) {
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return NULL;
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}
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PyFrameObject *f = _PyFrame_GetFrameObject(tstate->cframe->current_frame);
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PyFrameObject *f = _PyFrame_GetFrameObject(frame);
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if (f == NULL) {
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PyErr_Clear();
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}

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