/var/run/utmp permissions differ from those suggested in man 5 utmp
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Warning: utmp must not be writable, because many system programs (fool-
ishly) depend on its integrity. You risk faked system logfiles and
modifications of system files if you leave utmp writable to any user.
I checked on a clean install in a virtual machine, and the permissions are the same. Is this a problem?
I misunderstood the two statements: "utmp must not be writable" and subsequently "writable by any user" as meaning utmp must not be writable to anyone, no matter whether they owned the file or were part of its group (hence any user). I was expecting to see permissions of -r--r--r-- if anything. Thanks for pointing out the real meaning (though I think the man page could be worded less ambiguously).