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HeadHolio
Guru
Joined: 10 Aug 2002
Posts: 445
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 Posted: Mon Jan 27, 2003 6:10 am Post subject: unable to mount CD unless superuser |
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Here is my /etc/fstab
| Code: | # NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/hda1 /boot ext3 noauto,noatime 1 1
/dev/hda3 / reiserfs noatime 0 0
/dev/hda2 none swap sw 0 0
/dev/hda4 /home reiserfs noatime 0 0
#/dev/cdroms/cdrom0 /mnt/cdrom iso9660 noauto,users,ro 0 0
#/dev/fd0 /mnt/floppy auto noauto,user 0 0
proc /proc proc defaults 0 0
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink). Adding the following
# line to /etc/fstab should take care of this:
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will use almost no
# memory if not populated with files)
tmpfs /dev/shm tmpfs defaults 0 0
/dev/scsi/host0/bus0/target0/lun0/cd /mnt/cdrom auto ro,noauto,users,exec 0 0
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Now since the option "users" is in /mnt/cdrom it means that anyone can mount and unmount the cdrom right? Well, that doesn't happen. Nobody but root can use the mount command. |
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SuperTomate
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Joined: 02 Jun 2002
Posts: 392
Location: France
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| Posted: Mon Jan 27, 2003 7:11 am Post subject: |
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The option to allow any user to mount a device is "user" not "users".
EDIT : You're right ! It also works with "users".
From 'man mount' :
-> user : Allow an ordinary user to mount the file system.
The name of the mounting user is written to mtab so that he can unmount the file system again. This option implies the options noexec, nosuid, and nodev (unless overridden by subsequent options, as in the option line
user,exec,dev,suid).
-> users : Allow every user to mount and unmount the file system.
This option implies the options noexec, nosuid, and nodev (unless overridden by subsequent options, as in the option line users,exec,dev,suid).
I have this line in my /etc/fstab and I can mount my CD with any user :
| Code: | | /dev/cdroms/cdrom0 /mnt/cdrom iso9660 noauto,ro,user 0 0 |
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HeadHolio
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Joined: 10 Aug 2002
Posts: 445
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| Posted: Mon Jan 27, 2003 11:14 am Post subject: ok |
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| Well, it doesn't matter if I use "user" or "users", it still only lets root mount a cd. As you can see a little further up in my fstab, the line you have in your fstab is similar to the one I had before I got SCSI emulation and cd burning working. K3B automatically inserted that line at the bottom when I went through the setup, so I figured I had to comment out the line that I already had. Do you have a cd burner setup with scsi emulation? |
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drakonite
l33t
Joined: 02 Nov 2002
Posts: 768
Location: Lincoln, NE
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| Posted: Mon Jan 27, 2003 11:29 am Post subject: |
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Do you have the lines commented using the #'s in your fstab or is that just in what you posted?
If so then you need to remove the #'s at the begining of the lines that deal with the CD-ROM for it to work.
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HeadHolio
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Joined: 10 Aug 2002
Posts: 445
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| Posted: Mon Jan 27, 2003 12:00 pm Post subject: yup |
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| They are commented in my fstab. But I only commented it because of the line at the very bottom. I shouldn't have two lines for a cdrom device...should I? (K3B automatically inserted the line at the bottom during it's setup and only after I got scsi-emulation working). |
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HeadHolio
Guru
Joined: 10 Aug 2002
Posts: 445
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| Posted: Mon Jan 27, 2003 12:17 pm Post subject: test |
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Ok, for a test I did the following. I edited my fstab so that it contained the following:
| Code: | # NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/hda1 /boot ext3 noauto,noatime 1 1
/dev/hda3 / reiserfs noatime 0 0
/dev/hda2 none swap sw 0 0
/dev/hda4 /home reiserfs noatime 0 0
/dev/cdroms/cdrom0 /mnt/cdrom iso9660 noauto,users,ro 0 0
proc /proc proc defaults 0 0
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink). Adding the following
# line to /etc/fstab should take care of this:
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will use almost no
# memory if not populated with files)
tmpfs /dev/shm tmpfs defaults 0 0
#/dev/scsi/host0/bus0/target0/lun0/cd /mnt/cdrom auto ro,noauto,users,exec 0 0
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I also added the user "home" to all groups (just to be sure), and then rebooted (again, just to be sure). Then I tried to mount a cd, and I got the same error
| Code: |
home@mymachine home $ mount /mnt/cdrom
mount: must be superuser to use mount
home@mymachine home $
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What else could I be missing??? |
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HeadHolio
Guru
Joined: 10 Aug 2002
Posts: 445
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| Posted: Mon Jan 27, 2003 12:25 pm Post subject: problem solved |
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Ok, i got it to work by simply making mount executable by users other than root.
| Code: | chmod u+s /bin/mount
chmod u+s /bin/umount |
Now it works ok. Does everyone else also have their system setup like this?
Last edited by HeadHolio on Mon Jan 27, 2003 6:11 pm; edited 1 time in total |
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drakonite
l33t
Joined: 02 Nov 2002
Posts: 768
Location: Lincoln, NE
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| Posted: Mon Jan 27, 2003 12:54 pm Post subject: |
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I hate it when it's a permission error like that..
I missed the last line of the fstab that had the cdrom in it. No, you don't need it listed twice 
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SuperTomate
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Joined: 02 Jun 2002
Posts: 392
Location: France
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| Posted: Mon Jan 27, 2003 4:26 pm Post subject: Re: problem solved |
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| HeadHolio wrote: | | Now it works ok. Does everyone else also have their system setup like this? |
Yes, I have /bin/mount and /bin/umount with the suid bit but I haven't set them manually. (I use sys-apps/util-linux-2.11y) |
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