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

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Date:	Tue, 18 Dec 2007 09:03:23 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:	"\"\\\"Serge E. Hallyn\\\"\"" <serue@...ibm.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem.

Hello.

Serge E. Hallyn wrote:
> CAP_MKNOD will be removed from its capability
I think it is not enough because the root can rename/unlink device files
(mv /dev/sda1 /dev/tmp; mv /dev/sda2 /dev/sda1; mv /dev/tmp /dev/sda2).

> To use your approach, i guess we would have to use selinux (or tomoyo)
> to enforce that devices may only be created under /dev?
Everyone can use this filesystem alone.
But use with MAC (or whatever access control mechanisms that prevent
attackers from unmounting/overlaying this filesystem) is recomennded.
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