Re: [PATCH 5/9] Make use of permissions, returned by kobj_lookup

Greg KH
2008-03-08T06:13:23Z

On Fri, Mar 07, 2008 at 12:50:52PM -0600, Serge E. Hallyn wrote:
> Quoting Greg KH (greg@kroah.com):
> > On Fri, Mar 07, 2008 at 11:35:42AM -0600, Serge E. Hallyn wrote:
> > > > Do you really want to run other LSMs within a containerd kernel? Is
> > > > that a requirement? It would seem to run counter to the main goal of
> > > > containers to me.
> > >
> > > Until user namespaces are complete, selinux seems the only good solution
> > > to offer isolation.
> >
> > Great, use that instead :)
>
> That can't work as is since you can't specify major:minor in policy.

Your LSM can not, or the LSM interface does not allow this to happen?

> So all we could do again is simply refuse all mknod, which we can
> already do with per-process capability bounding sets.

I thought we passed that info down to the LSM module, can't you do your
selection at that point in time?

And then, just mediate open() like always, right?

thanks,

greg k-h