netdev - Re: [PATCH] don't allow CAP_NET_ADMIN to load non-netdev kernel modules

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20110227.151912.28823451.davem@davemloft.net>
Date:	Sun, 27 Feb 2011 15:19:12 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	segoon@...nwall.com
Cc:	bhutchings@...arflare.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, eric.dumazet@...il.com, therbert@...gle.com,
	xiaosuo@...il.com, jesse@...ira.com, kees.cook@...onical.com,
	eugene@...hat.com, dan.j.rosenberg@...il.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] don't allow CAP_NET_ADMIN to load non-netdev kernel
 modules

From: Vasiliy Kulikov <segoon@...nwall.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.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html