linux-kernel - Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem.

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Message-ID: <20071216194839.GV8181@ftp.linux.org.uk>
Date:	Sun, 16 Dec 2007 19:48:39 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Indan Zupancic <indan@....nu>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	david@...idnewall.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem.

On Sun, Dec 16, 2007 at 05:52:08PM +0100, Indan Zupancic wrote:

> What prevents them from mounting tmpfs on top of /dev, bypassing your fs?

Or binding /dev/null over nodes they want to get rid of...

> Also, if they have root there are plenty of ways to prevent an administrator
> from logging in, e.g. using iptables or changing the password.

Indeed.

BTW, tmpfs with root marked append-only and populated in normal ways on boot
would get a comparable effect without spending so much efforts.  Still won't
really help if attacker gains root, but then neither will your variant.
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