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gh-137335: Fix unlikely name conflicts for named pipes in multiprocessing and asyncio on Windows #137389

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Merged
serhiy-storchaka merged 9 commits into from
Feb 24, 2026
Merged

gh-137335: Fix unlikely name conflicts for named pipes in multiprocessing and asyncio on Windows #137389

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2a0a5e9
gh-137335: Fix unlikely nmae conflicts for named pipes in multiproces…
serhiy-storchaka Aug 4, 2025
5b91a56
Fix typo
serhiy-storchaka Aug 5, 2025
ed050a0
Do not use os.getpid() and tempfile._get_candidate_names().
serhiy-storchaka Aug 5, 2025
7363c99
Merge branch 'main' into temp-named-pipes
serhiy-storchaka Feb 5, 2026
5243b9e
Use os.urandom().
serhiy-storchaka Feb 5, 2026
81cb66e
Merge branch 'main' into temp-named-pipes
serhiy-storchaka Feb 10, 2026
5207bf6
Restore the PID and sequential number for debugging and reducing chan…
serhiy-storchaka Feb 10, 2026
cae80b9
Limit the number of attempts.
serhiy-storchaka Feb 10, 2026
de04089
Apply suggestion from @serhiy-storchaka
serhiy-storchaka Feb 10, 2026
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Use os.urandom().
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@serhiy-storchaka
serhiy-storchaka committed Feb 5, 2026
commit 5243b9ea7790fec7b184056b04fcea0f51a87ed9
3 changes: 1 addition & 2 deletions Lib/asyncio/windows_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@
import _winapi
import msvcrt
import os
import random
import subprocess
import warnings

Expand Down Expand Up @@ -51,7 +50,7 @@ def pipe(*, duplex=False, overlapped=(True, True), bufsize=BUFSIZE):
h1 = h2 = None
try:
while True:
address = r'\\.\pipe\python-pipe-' + random.randbytes(8).hex()
address = r'\\.\pipe\python-pipe-' + os.urandom(8).hex()
try:
h1 = _winapi.CreateNamedPipe(
address, openmode, _winapi.PIPE_WAIT,
Expand Down
3 changes: 1 addition & 2 deletions Lib/multiprocessing/connection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,6 @@
import errno
import io
import os
import random
import sys
import socket
import struct
Expand Down Expand Up @@ -76,7 +75,7 @@ def arbitrary_address(family):
elif family == 'AF_UNIX':
return tempfile.mktemp(prefix='sock-', dir=util.get_temp_dir())
elif family == 'AF_PIPE':
return r'\\.\pipe\pyc-' + random.randbytes(8).hex()
return r'\\.\pipe\pyc-' + os.urandom(8).hex()
else:
raise ValueError('unrecognized family')

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