[TUHS] can't protect files from deletion v5,v6, or v7

Mark Longridge cubexyz at gmail.com
Thu May 25 10:23:07 AEST 2017


Ok, I just did an experiment with the rm command and the results surprised me.

On Unix v5 logged in as root I created a small test file then did
chmod 444 on it. Unfortunately it appears that mere users can still rm
the file and also directories are not safe from the rmdir command
(even directories set to mode 444).

This seems to be the case for v6 and v7 as well.

To be fair rm will prompt the user with: test1: 0100444 mode
but the user only has to type y and hit enter and the file is toast.

Is there no way to completely protect files from being deleted?

Mark


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