 | | | USB utilities | USB utilities 2005-03-28 - By Barry Gamblin
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|>
|>
|> On Fri, 25 Mar 2005, Barry Gamblin wrote:
|> >
|> >> What are the correct entries? My /etc/updfstab.conf looks like
this:
|> >>
|> >> include /etc/updfstab.conf.default
|> >>
|> >> device usbdrive {
|> >> partition 1
|> >> match hd WDC
|> >> }
|> >>
|> >> And when I plug in the drive I get this in /etc/fstab:
|> >>
|> >> /dev/sda1 /mnt/usbdrive auto noauto,owner,kudzu 0 0
|> >>
|> >> But a normal user cannot mount /mnt/usbdrive. It says that only
|> >> the superuser can mount.
|> >
|> > Stephen Gardner wrote:
|> >
|> > I think you may have found a bug with updfstab or one of the other
hotplug
|> > associated tools. If you delete the options you added to
/etc/updfstab.conf
|> > and just add the "match hd WDC" line to the "device flash"
section in
|> > /etc/updfstab.conf.default you should find it works as expected.
The section
|> > you added looks fine to me and I've just tested something similar
but the
|> > underlying problem (the cause of the message you're getting) is
that
|> > /dev/sda1 isn't being set to be owned by the console user. When
the "match"
|> > line is part of the "device flash" section in
/etc/updfstab.conf.default
|> > then /dev/sda1 gets set to the correct ownership to allow the
mount to
|> > work. Editing /etc/updfstab.conf.default isn't a long term
solution but will
|> > get you going for now. I'll do some more digging with strace and
see if I can
|> > find the underlying cause.
|>
|> Just to clear up the underlying problem Barry had here.. well, if I
can
|> because it's complicated..
|>
|> The underlying problem is indeed that when a custom "device" entry is
|> added to /etc/updfstab.conf(.default) it won't get the correct
|> permissions assigned to the /dev/<device> device node without
additional
|> changes being make to /etc/security/console.perms.
|>
|> [ this may all be in the archives somewhere and I've found a few
|> references on the web so feel free to ignore the explanation ]
|>
|> Using Barry's example, when the USB device gets plugged in
|> /usr/sbin/updfstab modifies /etc/fstab correctly and makes the
|> directory /mnt/usbdrive. However when /usr/sbin/updfstab calls
|> /sbin/pam_console_apply it has no permissions rules for
/mnt/usbdrive
|> (and therefore its associated /dev/sda1 device) in
|> /etc/security/console.perms. The upshot of which is that the
permissions
|> don't get set correctly leaving /dev/sda1 still owned by root and
|> unmountable by normal users.
|>
|> Making an addition to the existing "device flash" section in
|> /etc/updfstab.conf.default ("match hd WDC" in this case) means
Barry's
|> device will initiate the creation of /mnt/flash which *does* get a
match
|> in /etc/security/console.perms and /dev/sda1 then gets its
ownership
|> changed.
|>
|> The conclusion to all of this is that if you modify
/etc/updfstab.conf
|> to include a new "device" entry you'll need to modify
|> /etc/security/console.perms as well if you want non-root users to be
able
|> to mount it.
|>
|> Barry, two things. Firstly RHEL3-U5 includes a replacement kudzu
package
|> which is likely to clobber your changes if you apply the new package
|> (although they'll get saved in the .rpmsave version of the file).
|> Secondly, if you bugzilla the details of the USB device (WDC) as an
|> enhancement to the kudzu packages /etc/updfstab.conf.default file
it
|> might make it in in time for U5.
|>
|> Regards,
|> Stephen
|>
Thanks for the explanation! I'll look into the bugzilla report.
Barry
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