netdev - Re: [RFC Patch] net: reserve ports for applications using fixed port numbers

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Message-Id: <201002051428.12767.opurdila@ixiacom.com>
Date:	Fri, 5 Feb 2010 14:28:12 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, nhorman@...driver.com,
	linux-sctp@...r.kernel.org
Subject: Re: [RFC Patch] net: reserve ports for applications using fixed port numbers

On Friday 05 February 2010 08:01:43 you wrote:

> >> If you can accept his version, I want to use his version (with an
> >> interface for updating above "reserved_ports" by not only root user's
> >> sysctl() but also MAC's policy configuration).
> >
> > I think that simply using an interface to update the reserved_ports from
> > MAC policy configuration module wouldn't work, as root will be able to
> > modify the policy via sysctl.
> >
> > I think that we might need to:
> >
> > a) have a reserved_port updater
> >
> > b) put a LSM hook into that
> >
> > c) use the reserved_port updater from sysctl
> 
> Ideally, you'd provide an interface for port allocator to use, so
> doing port reservation will be easier.
> 

If I understand the TOMOYO requirements correctly, we need a way to restrict a 
user action based on some security policy (in this case the ability to clear 
reserved ports). Traditionally that has been done with LSM hooks, so I think 
that approach is preferable.
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