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bpo-38748: Add test for stack corruption. #26204

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merged 7 commits into from Sep 26, 2022
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Merged

bpo-38748: Add test for stack corruption. #26204

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cd91426
Add test for stack corruption in issue 38748.
michaelDCurran May 17, 2021
07d66cb
ctypes.test.test_callbacks.Callbacks.test_i38748_stackCorruption: Onl…
michaelDCurran Nov 11, 2021
b1c6e53
Add back newline
michaelDCurran Nov 11, 2021
f0100eb
Merge branch 'main' into test_i38748
zooba Jun 6, 2022
800f0c0
Update Lib/ctypes/test/test_callbacks.py
zooba Jun 6, 2022
3525bbf
Merge branch 'main' into test_i38748
michaelDCurran Sep 23, 2022
3f2fc41
Ctypes callback test for 38748: no longer mark as expected failure as…
michaelDCurran Sep 24, 2022
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13 Lib/test/test_ctypes/test_callbacks.py
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@@ -1,3 +1,4 @@
import sys
import functools
import unittest
from test import support
@@ -150,6 +151,18 @@ def __del__(self):
gc.collect()
CFUNCTYPE(None)(lambda x=Nasty(): None)

@need_symbol('WINFUNCTYPE')
def test_i38748_stackCorruption(self):
callback_funcType = WINFUNCTYPE(c_long, c_long, c_longlong)
@callback_funcType
def callback(a, b):
c = a + b
print(f"a={a}, b={b}, c={c}")
return c
dll = cdll[_ctypes_test.__file__]
# With no fix for i38748, the next line will raise OSError and cause the test to fail.
self.assertEqual(dll._test_i38748_runCallback(callback, 5, 10), 15)


@need_symbol('WINFUNCTYPE')
class StdcallCallbacks(Callbacks):
13 Modules/_ctypes/_ctypes_test.c
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@@ -1034,6 +1034,19 @@ EXPORT (HRESULT) KeepObject(IUnknown *punk)

#endif

#ifdef MS_WIN32

// i38748: c stub for testing stack corruption
// When executing a Python callback with a long and a long long

typedef long(__stdcall *_test_i38748_funcType)(long, long long);

EXPORT(long) _test_i38748_runCallback(_test_i38748_funcType callback, int a, int b) {
return callback(a, b);
}

#endif

static struct PyModuleDef_Slot _ctypes_test_slots[] = {
{0, NULL}
};