Date: Sun, 27 Feb 2011 15:19:12 -0800 (PST)
Message-Id: <20110227.151912.28823451.davem@davemloft.net>
To: segoon@openwall.com
Cc: bhutchings@solarflare.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, kuznet@ms2.inr.ac.ru, pekkas@netcore.fi,
        jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@trash.net,
        eric.dumazet@gmail.com, therbert@google.com, xiaosuo@gmail.com,
        jesse@nicira.com, kees.cook@canonical.com, eugene@redhat.com,
        dan.j.rosenberg@gmail.com, akpm@linux-foundation.org
Subject: Re: [PATCH] don't allow CAP_NET_ADMIN to load non-netdev kernel
 modules
From: David Miller <davem@davemloft.net>
In-Reply-To: <20110227114438.GA4317@albatros>
References: <1298660879.2554.23.camel@bwh-desktop>
	<20110225.111606.115927805.davem@davemloft.net>
	<20110227114438.GA4317@albatros>
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From: Vasiliy Kulikov <segoon@openwall.com>
Date: Sun, 27 Feb 2011 14:44:38 +0300

> Then the things are still broken - a user has to update modprobe
> together with the kernel, otherwise the updated kernel would call
> "modprobe" with unsupported argument and even "sit0" wouldn't work.

The capability bits get passed on the modprobe command line.

The module loading system call in the kernel inspects the command
line looking for the argument, and uses it to validate the module
load by comparing the mask with the special ELF section.
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