Article View: mod.computers.masscomp
Article #71protection of memory
From: William
Date: Fri, 21 Nov 1986 13:10
Date: Fri, 21 Nov 1986 13:10
50 lines
2384 bytes
2384 bytes
> We're having a problem with ps.
> Under the -f option nothing is printed under the UID column. Does
> anyone have an idea on why this may be?
> [ My best guess is that ps may not be chmod correctly... it does work
> correctly on my systems... here is the output of an ls on some files of
> interest.
>
> MUS% ls -la /bin/ps /dev/*mem
> -rwsr-sr-x 1 root sys 47593 Aug 18 16:09 /bin/ps
> crw-rw-rw- 1 root sys 3, 1 Aug 19 09:11 /dev/kmem
> crw-rw-rw- 1 root sys 3, 0 Aug 19 09:11 /dev/mem
>
> If your system does not look like this, my guess is that that is your
> problem.
>
> Stan, moderator]
>
Stan,
I would be very concerned about the modes you suggest using for
/dev/mem and /dev/kmem. Imagine a non-superuser typing:
cat /etc/passwd > /dev/mem
I would suggest something more like:
-rwsr-sr-x 1 root sys 47593 Aug 18 16:09 /bin/ps
cr--r----- 1 root sys 3, 1 Aug 19 09:11 /dev/kmem
cr--r----- 1 root sys 3, 0 Aug 19 09:11 /dev/mem
A clever user could easily break into the system by writing into
/dev/mem and changing their uid in the user structure. A more clever
user could possibly read a password from a clist. If you pay attention
to a few other files (/dev/swap) ps can be made :
-rwxr-sr-x 1 root sys 47593 Aug 18 16:09 /bin/ps
This is how we run our Masscomp systems.
Bill King @ abic.abnet.com
Industrial Computer Division
747 Alpha Drive, Highland Heights, OH 44143
@{decvax,cwruecmp,pyramid}.UUCP:wrk@abic.ABNET.COM
[You are correct, of course. We run a relatively relaxed environment
here, so the memory protections are less of a problem for us. I would
still be concerned that kmem cannot be read by everyone since many
people like to pull out load averages and such.
Thanks for your comments.
Stan == moderator]
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbatt!cbosgd!soma!William King <rice!sun!abic!wrk> From: William@soma.UUCP Newsgroups: mod.computers.masscomp Subject: protection of memory Message-ID: <2552@soma.bcm.tmc.edu> Date: Fri, 21-Nov-86 08:10:20 EST Article-I.D.: soma.2552 Posted: Fri Nov 21 08:10:20 1986 Date-Received: Sun, 23-Nov-86 03:15:50 EST Sender: masscomp@soma.bcm.tmc.edu Lines: 50 Approved: masscomp@soma.uucp