netdev - Re: [PATCH 3/3] selinux: Add SELinux GTP support

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Message-ID: <CAHC9VhT5HahBhow0RzWHs1yAh5qQw2dZ-3vgJv5GuyFWrXau1A@mail.gmail.com>
Date:   Sun, 11 Oct 2020 22:09:11 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Harald Welte <laforge@...monks.org>, pablo@...filter.org,
        Richard Haines <richard_c_haines@...nternet.com>
Cc:     selinux@...r.kernel.org, linux-security-module@...r.kernel.org,
        osmocom-net-gprs@...ts.osmocom.org, netdev@...r.kernel.org,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 3/3] selinux: Add SELinux GTP support

On Wed, Sep 30, 2020 at 9:39 AM Harald Welte <laforge@...monks.org> wrote:
> Hi Richard,
>
> On Wed, Sep 30, 2020 at 01:25:27PM +0100, Richard Haines wrote:
>
> > As in the reply to Pablo, I did it for no particular reason other than
> > idle curiosity, and given the attempted move to Open 5G I thought
> > adding MAC support might be useful somewhere along the line.
>
> ...
>
> I think it would not be the best idea to merge SELinux support patches for the
> GTP kernel driver without thoroughly understanding the use case, and/or having
> some actual userspace implementations that make use of them.  In the end, we may
> be introducing code that nobody uses, and which only turns out to be insufficient
> for what later actual users may want.
>
> So like Pablo suggested, it would probably be best to focus on
> submitting / merging features for things that are either well-defined (e.g.
> specified in a standerd), and/or have existing userspace implementations.

Having a solid use case or two is also helpful for those of us who
don't have a GTP/GPRS background.  I did spend some time reading a few
things on GTP, but I don't feel like I've made much of a dent on
understanding how it is actually used.

Harald, Pablo - I know you both suggested taking a slow iterative
approach to merging functionality, perhaps you could also help those
of us on the SELinux side better understand some of the common GTP use
cases?

-- 
paul moore
www.paul-moore.com