GMIRROR can be destroyed by ordinary users

Doug White dwhite at
Thu Jan 13 17:18:25 PST 2005

On Sat, 8 Jan 2005, Simon L. Nielsen wrote:

> On 2005.01.08 19:39:42 +0100, Pawel Jakub Dawidek wrote:
> > On Sat, Jan 08, 2005 at 04:33:14PM +0100, Simon L. Nielsen wrote:
> > +> I'm not really sure it is expected that you can do that when being in
> > +> the operator group.
> >
> > Yes. If you want to change it you should do:
> >
> > 	# chmod 600 /dev/geom.ctl
> Being in the operator group only gives read access to /dev/geom.ctl
> (it's root:operator crw-r-----) so I think it's somewhat counter
> intuitive that one can stop the mirror without write permission there.
> Wouldn't it be better to only allow stopping the mirror (and similar)
> if the user has write access to geom.ctl?

ioctls generally open the control device read-only so they will succeed if
the user had read access to the device. ioctls themselves do not have read
or write permission bits, so its all-or-nothing unless the driver or
kernel code does suser() type checks.

At least at a filesystem level.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at          |

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