Message-Id: <200712180003.lBI03N7F092396@www262.sakura.ne.jp>
Subject: Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem.
From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: "\"\\\"Serge E. Hallyn\\\"\"" <serue@us.ibm.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       Linux Containers <containers@lists.osdl.org>
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Date: Tue, 18 Dec 2007 09:03:23 +0900
References: <20071216080441.435456586@I-love.SAKURA.ne.jp> <20071216080628.061470932@I-love.SAKURA.ne.jp> <200712161944.HEI26071.MOtOFLVHFSQFOJ@I-love.SAKURA.ne.jp> <200712161956.BJE32406.FOOHtQJLMFOSVF@I-love.SAKURA.ne.jp> <20071217194802.GA14156@sergelap.austin.ibm.com>
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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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