/lib/systemd/system/systemd-udevd-control.socket is in udev 232-25+deb9u8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | # This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=udev Control Socket
Documentation=man:systemd-udevd.service(8) man:udev(7)
DefaultDependencies=no
Before=sockets.target
ConditionPathIsReadWrite=/sys
[Socket]
Service=systemd-udevd.service
ListenSequentialPacket=/run/udev/control
SocketMode=0600
PassCredentials=yes
RemoveOnStop=yes
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