[lug] Allowing Users to Supermount
truskell at Mines.EDU
Sun Feb 25 22:06:44 MST 2001
In addition to Alan's comments, you can also include a umask option to
mount, or in your fstab, depending on your needs. For example, the
following line in fstab allows full rwx access to the mount point.
/dev/hda5 /DriveD vfat defaults,umask=0000 0
As always, beware of the security problems associate with this. However,
I believe you can also specify both a user and a group with the mount
command, as well. Combined with an appropriate umask, you should be able
to get what you need.
On Sun, 25 Feb 2001, Alan Robertson wrote:
> SoloCDM wrote:
> > How do I allow specified users access to a supermounted cdrom
> > (iso9660)?
> > Every time I "ls -A" /[mount_directory], from a user account,
> > I get: ls: /[mount_directory]: Permission denied. I tried adding
> > permissions for the user to group adm, disk, cdrom. I changed the
> > permissions for /dev/hdd to 666, 644, 655. I tried mounting the
> > cdrom with supermount disabled and I get: mount: /dev/hdd already
> > mounted or /[mount_directory] busy. The first bit, after switching
> > everything back to the original settings, is set to: brw-------,
> > which I surmised must be the reason for the "busy" message, because
> > I didn't find any reference for "b".
> > BTW, what is the chmod mode or octal_mode for "b"?
> "b" means block special device. It means it's a disk like device. Trust
> me, you don't want to change that.
> The mount system call is just plain restricted to the superuser. Device
> permissions don't matter. However, the /sbin/mount command can have a flag
> in it called user which will allow mere mortals to perform the requested
> mount operation.
> >From the "mount(8)" man page while talking about /etc/fstab:
> (iii) Normally, only the superuser can mount file systems.
> However, when fstab contains the user option on a line,
> then anybody can mount the corresponding system.
> Thus, given a line
> /dev/cdrom /cd iso9660 ro,user,noauto,unhide
> any user can mount the iso9660 file system found on his
> CDROM using the command
> mount /dev/cdrom
> mount /cd
> -- Alan Robertson
> alanr at unix.sh
> Web Page: http://lug.boulder.co.us
> Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
More information about the LUG