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GH-102397: Fix segfault from race condition in signal handling (#102399)

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Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Kumar Aditya 2023-03-08 13:29:39 +05:30 committed by GitHub
parent 061325e0d2
commit 1a84cc007e
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3 changed files with 21 additions and 0 deletions
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15
Lib/test/test_signal.py
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@ -1406,6 +1406,21 @@ def handler(a, b):
signal.raise_signal(signal.SIGINT)
self.assertTrue(is_ok)
def test__thread_interrupt_main(self):
# See https://github.com/python/cpython/issues/102397
code = """if 1:
import _thread
class Foo():
def __del__(self):
_thread.interrupt_main()
x = Foo()
"""
rc, out, err = assert_python_ok('-c', code)
self.assertIn(b'OSError: Signal 2 ignored due to race condition', err)
class PidfdSignalTest(unittest.TestCase):

2
Misc/NEWS.d/next/Core and Builtins/2023-03-04-06-48-34.gh-issue-102397.ACJaOf.rst Normal file
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@ -0,0 +1,2 @@
Fix segfault from race condition in signal handling during garbage collection.
Patch by Kumar Aditya.

4
Modules/signalmodule.c
View file

@ -148,6 +148,10 @@ get_signal_state(PyObject *module)
static inline int
compare_handler(PyObject *func, PyObject *dfl_ign_handler)
{
// See https://github.com/python/cpython/pull/102399
if (func == NULL || dfl_ign_handler == NULL) {
return 0;
}
assert(PyLong_CheckExact(dfl_ign_handler));
if (!PyLong_CheckExact(func)) {
return 0;