linux-kernel - Re: Out of tree module using LSM

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Message-ID: <20071129220842.GZ8181@ftp.linux.org.uk>
Date:	Thu, 29 Nov 2007 22:08:42 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Valdis.Kletnieks@...edu
Cc:	Jon Masters <jonathan@...masters.org>,
	Ray Lee <ray-lk@...rabbit.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, tvrtko.ursulin@...hos.com,
	Casey Schaufler <casey@...aufler-ca.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Out of tree module using LSM

On Thu, Nov 29, 2007 at 03:56:28PM -0500, Valdis.Kletnieks@...edu wrote:
> Yes, most of these schemes *can* be bypassed because some malicious code does a
> mmap() or similar trick. But what is being overlooked here is that in most
> cases, what is *desired* is a way to filter things being handled by *non*
> malicious code.  Yeah, sure, a shar archive can contain a binary that does evil
> things - but if we stop /bin/cp from copying the file that has the evil in it,
> it's a non-issue.

Then all you need is scan-on-commit with commit-on-close.  Which requires
no changes of anything that would run in kernel mode and no bothering with
LSM whatsoever.

Incidentally, I would really love to see the threat profile we are talking
about.  I have some impressions in that area, but I would rather keep them
to myself for now - I really want to see the answers.
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