GH-107774: Add missing audit event for PEP 669 (GH-107775)

Lib/test/audit-tests.py

@@ -514,6 +514,17 @@ def test_not_in_gc():
             assert hook not in o
 
 
+def test_sys_monitoring_register_callback():
+    import sys
+
+    def hook(event, args):
+        if event.startswith("sys.monitoring"):
+            print(event, args)
+
+    sys.addaudithook(hook)
+    sys.monitoring.register_callback(1, 1, None)
+
+
 if __name__ == "__main__":
     from test.support import suppress_msvcrt_asserts
 

Lib/test/test_audit.py

@@ -257,5 +257,18 @@ class AuditTest(unittest.TestCase):
             self.fail(stderr)
 
 
+    def test_sys_monitoring_register_callback(self):
+        returncode, events, stderr = self.run_python("test_sys_monitoring_register_callback")
+        if returncode:
+            self.fail(stderr)
+
+        if support.verbose:
+            print(*events, sep='\n')
+        actual = [(ev[0], ev[2]) for ev in events]
+        expected = [("sys.monitoring.register_callback", "(None,)")]
+
+        self.assertEqual(actual, expected)
+
+
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Security/2023-08-05-03-51-05.gh-issue-107774.VPjaTR.rst

@@ -0,0 +1,3 @@
+PEP 669 specifies that ``sys.monitoring.register_callback`` will generate an
+audit event. Pre-releases of Python 3.12 did not generate the audit event.
+This is now fixed.

Python/instrumentation.c

@@ -1851,6 +1851,9 @@ monitoring_register_callback_impl(PyObject *module, int tool_id, int event,
         PyErr_Format(PyExc_ValueError, "invalid event %d", event);
         return NULL;
     }
+    if (PySys_Audit("sys.monitoring.register_callback", "O", func) < 0) {
+        return NULL;
+    }
     if (func == Py_None) {
         func = NULL;
     }