SUID problem

kevmcool · 05-26-2010, 08:31 AM

centos 5.4

i thought i understood this simple little bit

i thought i would apply it to /bin/mount so a regular user could use to to mount an
nfs share
chmod u+s /bin/mount
but the user gets permission denied
can you please tell me what else is stopping the user executing mount

thanks guru's

business_kid · 05-26-2010, 09:42 AM

in /etc/fstab, put the option user in the line about whatever disks you want the user to mount where it now has 'defaults'

You may have to configure something in nfsd - dunno about that.

chrism01 · 05-26-2010, 06:57 PM

FYI, the default install already sets suid (Centos 5.5)

ls -l /bin/mount
-rwsr-xr-x 1 root root 58324 Jan 20 20:43 /bin/mount

kevmcool · 05-28-2010, 10:55 AM

i think your right about SUID being part of the defaults

/bin/mount works for a regular user with the default 755 perm

/bin/mount -t nfs host:/dir /mnt does not work even if you give it 4755

/sbin/iptables-save has 755 and reg user can not use

/sbin/iptables-save with 4755 and reg user can use

why does mount work and iptables-save does not for reg user both with 755

i think its something to do with some of these commands opening files they dont have perms to and maybe starting processes

oh well