mountpoint permissions

Meson · 09-20-2008, 03:25 PM

What are the requirements for a user to mount something in the fstab? rx permissions on the directory?

Here's what is troubling me. I have the following lines in my fstab.

Code:

/dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0

//windows-machine/share	/media/windows-machine/share cifs noauto,user,file_mode=0600,dir_mode=0700,credentials=credfile 0 0

So, cds and that windows share should both be able to be mounted by ordinary users.

Here's the listing of each mountpoint and the mount commands:

Code:

drwxr-xr-x 2 root root 4096 2008-09-14 22:46 cdrom0
drwxr-xr-x 2 root root 4096 2008-09-18 14:39 share

-rwsr-xr-x 1 root root 81368 2008-04-29 07:57 /bin/mount
-rwsr-xr-x 1 root root 23340 2008-09-10 14:55 /sbin/mount.cifs

So everything should behave exactly the same. However, the cdrom mounts just fine and the windows share fails with this:

Code:

mount error: permission denied or not superuser and mount.cifs not installed SUID

(Note: if I change ownership on the mountpoint for the windows share it all works fine, but I don't see why there should be a difference between this two devices.)

John VV · 09-22-2008, 12:01 AM

what distro are you running

Meson · 09-22-2008, 02:35 AM

Ubuntu Hardy

Meson · 09-22-2008, 02:37 AM

Quote:

Originally Posted by John VV

what distro are you running

Ubuntu Hardy.

Could it have something to do with AppArmor?

i92guboj · 09-22-2008, 07:30 AM

The distro shouldn't really matter.

Read the "mount" man page. The option you need is probably "users", which is very different from "user". Both options do different things.

Meson · 09-22-2008, 07:44 AM

Quote:

Originally Posted by i92guboj

The distro shouldn't really matter.

Read the "mount" man page. The option you need is probably "users", which is very different from "user". Both options do different things.

Well, that option doesn't affect this issue. The "users" option allows any user to mount as well as any user to unmount. Whereas the "user" option only allows root or the original mounting user to unmount.

i92guboj · 09-22-2008, 08:04 AM

Quote:

Originally Posted by Meson

Well, that option doesn't affect this issue. The "users" option allows any user to mount as well as any user to unmount.

Maybe I didn't understand your question adequately, I thought that that was what you were asking.

Meson · 09-22-2008, 10:07 AM

Quote:

Originally Posted by i92guboj

Maybe I didn't understand your question adequately, I thought that that was what you were asking.

What I'm asking is that given the similar fstab entry, the same permissions and owner on the mountpoint, and same permissions and owner on mount and mount.cifs, why is the one failing...