> > +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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