checking for unauthorized devices

checking for unauthorized devices

Post by Pat Traino » Mon, 17 Feb 1997 04:00:00

After issuing the command:

find / \( -type c -o -type b \) -exec ls -l {} \;

to locate unauthorized device filenames, how can I then decide which to
change and/or elliminate?

        Does anyone have the straight poop on what file permissions and
ownerships should be for /dev and /proc ?

        Ideally I'd like to delete all unused devices, just to make it
easier to keep track of.. Any ideas?


    "So other than that, Mrs. Lincoln, how did you enjoy the play?" -+- National Tuberous Sclerosis Association


1. Permission check for devices on NFS fs broken (Solaris 2.2)?

Solaris 2.2, patch 100999-17 installed: I get a "Not owner" error when
e.g. trying to open a null device for writing if the device is on an NFS

# mount
/ on /dev/dsk/c0t3d0s0 read/write/setuid on Fri Aug 13 14:38:10 1993
/usr/local/scratch on super:/usr/local/scratch read/write/setuid/remote on Wed Aug 18 13:44:12 1993
# mknod /null c 13 2
# mknod /usr/local/scratch/null c 13 2
# chmod 666 /null /usr/local/scratch/null
# chown per /null /usr/local/scratch/null
# suspend

Stopped (signal)
% ls -l /devices/pseudo/mm:null  /null /usr/local/scratch/null
crw-rw-rw-   1 root     sys       13,  2 Aug 18 12:48 /devices/pseudo/mm:null
crw-rw-rw-   1 per      other     13,  2 Aug 18 13:44 /null
crw-rw-rw-   1 per      other     13,  2 Aug 18  1993 /usr/local/scratch/null
% echo xxx >/null
% echo xxx >/usr/local/scratch/null
/usr/local/scratch/null: Not owner
% whoami

Same thing appears to happen for all devices, pseudo or not. It works
fine for root. This would seem to be a problem for diskless clients...?
Patches, comments, explanations welcome!

--Per Hedeland


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