Re: [RCF] [PATCH] unprivileged mount/umount

Christoph Hellwig
2005-05-11T08:52:09Z

On Wed, May 04, 2005 at 04:21:23PM +0200, Miklos Szeredi wrote:
> Yes, I see your point. However the problem of malicious filesystem
> "traps" applies to private namespaces as well (because of suid
> programs).
>
> So if a user creates a private namespace, it should have the choice of:
>
> 1) Giving up all suid rights (i.e. all mounts are cloned and
> propagated with nosuid)
>
> 2) Not giving up suid for cloned and propagated mounts, but having
> extra limitations (suid/sgid programs cannot access unprivileged
> "synthetic" mounts)

Although I hate special cases I think that we might need 2) to avoid too
much trouble tripping over the global namespace. OTOH that should also
accelarate adoption of giving each user a separate namespace on login in
the various distribution, which is a good thing ;-)