Subject: Re: 'ps' and /dev/mem permissions?
To: None <email@example.com, macbsd-general@NetBSD.ORG>
From: Ben Cottrell <benco@ucsee.EECS.Berkeley.EDU>
Date: 03/03/1995 08:07:11
Before making /dev/mem world-readable (which would solve your present
problem, but which would not be good for security :-)), I'd check
which group owns /dev/mem, and the permissions on /bin/ps.
/dev/mem should be group kmem, group readable, but NOT others
readable. /bin/ps should be group kmem and setgid. That way,
/bin/ps can read /dev/mem, but other things can't.
Also, why is it choking on /dev/mem and not /dev/kmem? If I'm
not mistaken, ps would have a lot of use for /dev/kmem but none
For reference, here's an ls on my system:
144 -r-xr-sr-x 1 bin kmem 139264 Oct 19 15:05 /bin/ps
0 crw-r----- 1 root kmem 2, 1 Nov 10 06:49 /dev/kmem
0 crw-r----- 1 root kmem 2, 0 Nov 10 06:49 /dev/mem