8000 bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module by tiran · Pull Request #31759 · python/cpython · GitHub
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bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module #31759

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Merged
merged 4 commits into from
Mar 8, 2022
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bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module #31759

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fdd38cb
bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module
tiran Mar 8, 2022
3438104
Fix comparison in PyErr_SetInterruptEx()
tiran Mar 8, 2022
cc4df05
Compare handler in a safe helper function
tiran Mar 8, 2022
76e3135
Use right order of arguments
tiran Mar 8, 2022
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Fix comparison in PyErr_SetInterruptEx()
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@tiran
tiran committed Mar 8, 2022
commit 34381041b9c92b78dfe7f76c3bca652b5a315597
10 changes: 9 additions & 1 deletion Modules/signalmodule.c
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Original file line number Diff line number Diff line change
C453 Expand Up @@ -1911,7 +1911,15 @@ PyErr_SetInterruptEx(int signum)

signal_state_t *state = &signal_global_state;
PyObject *func = get_handler(signum);
if (func != state->ignore_handler && func != state->default_handler) {
int is_ign = PyObject_RichCompareBool(func, state->ignore_handler, Py_EQ);
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Is it okay to call a Python code in PyErr_SetInterruptEx()?

If func is a custom callable, it can have an __eq__ method which can call an arbitrary Python code here.

It may be safer to use PyLong_Check() + PyLong_GetLongAndOverflow().

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Good point!

I took a different approach and added a helper function. We can safely assume that the internal handler objects are always exact longs. Comparison between exact longs should never fail.

if (is_ign == -1) {
return -1;
}
int is_dfl = PyObject_RichCompareBool(func, state->default_handler, Py_EQ);
if (is_dfl == -1) {
return -1;
}
if ((is_ign == 0) && (is_dfl == 0)) {
trip_signal(signum);
}
return 0;
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