/lib/systemd/system/run-lock.mount is in systemd 44-11+deb7u4.
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 | [Unit]
Description=Lock Directory
Before=local-fs.target
[Mount]
What=tmpfs
Where=/run/lock
Type=tmpfs
Options=nodev,noexec,nosuid,size=5242880
|