[Python-checkins] gh-96684: Silently suppress COM security errors in _wmi module (GH-96690)
zooba
webhook-mailer at python.org
Thu Sep 8 17:02:45 EDT 2022
https://github.com/python/cpython/commit/95d6330a3edacacd081f55699bd6f0a787908924
commit: 95d6330a3edacacd081f55699bd6f0a787908924
branch: main
author: Steve Dower <steve.dower at python.org>
committer: zooba <steve.dower at microsoft.com>
date: 2022-09-08T22:02:04+01:00
summary:
gh-96684: Silently suppress COM security errors in _wmi module (GH-96690)
files:
M Lib/test/test_wmi.py
M PC/_wmimodule.cpp
diff --git a/Lib/test/test_wmi.py b/Lib/test/test_wmi.py
index af2a453dcb52..3f5795952905 100644
--- a/Lib/test/test_wmi.py
+++ b/Lib/test/test_wmi.py
@@ -1,10 +1,9 @@
# Test the internal _wmi module on Windows
# This is used by the platform module, and potentially others
-import re
import sys
import unittest
-from test.support import import_helper
+from test.support import import_helper, requires_resource
# Do this first so test will be skipped if module doesn't exist
@@ -20,7 +19,7 @@ def test_wmi_query_os_version(self):
self.assertEqual("Version", k, r[0])
# Best we can check for the version is that it's digits, dot, digits, anything
# Otherwise, we are likely checking the result of the query against itself
- self.assertTrue(re.match(r"\d+\.\d+.+$", v), r[0])
+ self.assertRegex(v, r"\d+\.\d+.+$", r[0])
def test_wmi_query_repeated(self):
# Repeated queries should not break
@@ -46,6 +45,7 @@ def test_wmi_query_not_select(self):
with self.assertRaises(ValueError):
_wmi.exec_query("not select, just in case someone tries something")
+ @requires_resource('cpu')
def test_wmi_query_overflow(self):
# Ensure very big queries fail
# Test multiple times to ensure consistency
@@ -61,7 +61,15 @@ def test_wmi_query_multiple_rows(self):
it = iter(r.split("\0"))
try:
while True:
- self.assertTrue(re.match(r"ProcessId=\d+", next(it)))
+ self.assertRegex(next(it), r"ProcessId=\d+")
self.assertEqual("", next(it))
except StopIteration:
pass
+
+ def test_wmi_query_threads(self):
+ from concurrent.futures import ThreadPoolExecutor
+ query = "SELECT ProcessId FROM Win32_Process WHERE ProcessId < 1000"
+ with ThreadPoolExecutor(4) as pool:
+ task = [pool.submit(_wmi.exec_query, query) for _ in range(32)]
+ for t in task:
+ self.assertRegex(t.result(), "ProcessId=")
diff --git a/PC/_wmimodule.cpp b/PC/_wmimodule.cpp
index fbaadcc51100..de22049dd33f 100644
--- a/PC/_wmimodule.cpp
+++ b/PC/_wmimodule.cpp
@@ -63,6 +63,12 @@ _query_thread(LPVOID param)
RPC_C_IMP_LEVEL_IMPERSONATE,
NULL, EOAC_NONE, NULL
);
+ // gh-96684: CoInitializeSecurity will fail if another part of the app has
+ // already called it. Hopefully they passed lenient enough settings that we
+ // can complete the WMI query, so keep going.
+ if (hr == RPC_E_TOO_LATE) {
+ hr = 0;
+ }
if (SUCCEEDED(hr)) {
hr = CoCreateInstance(
CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER,
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