> > +static bool permit_umount(struct vfsmount *mnt, int flags)
> > +{
> >
> > ...
> >
> > +	return mnt->mnt_uid == current->uid;
> > +}
> 
> Yes, this seems very wrong.  I'd have thought that comparing user_struct*'s
> would get us a heck of a lot closer to being able to support aliasing of
> UIDs between different namespaces.
> 

OK, I'll fix this up.

Actually an earlier version of this patch did use user_struct's but
I'd changed it to uids, because it's simpler.  I didn't think about
this being contrary to the id namespaces thing.

Miklos
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