linux-kernel - Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part 3/4: introduce new capabilities

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Message-ID: <20060918160217.97076.qmail@web36601.mail.mud.yahoo.com>
Date:	Mon, 18 Sep 2006 09:02:17 -0700 (PDT)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Joshua Brindle <method@...too.org>,
	David Madore <david.madore@....fr>
Cc:	Pavel Machek <pavel@....cz>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel mailing-list <linux-kernel@...r.kernel.org>,
	LSM mailing-list <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part 3/4: introduce new capabilities

--- Joshua Brindle <method@...too.org> wrote:

> And that is just practical stuff, there are still
> problems with
> embedding policy into binaries all over the system
> in an entirely
> non-analyzable way, and this extends to all
> capabilities, not just the
> open() one.

Your assertion that directly associating
the capabilities with the binary cannot
be analysed is demonstrably incorrect,
reference Common Criteria validation
reports CCEVS-VR-02-0019 and CCEVS-VR-02-0020.

The first system I took through evaluation
(that is, independent 3rd party analysis) stored
security attributes in a file while the second
and third systems attached the attributes
directly (XFS). The 1st evaluation required
5 years, the 2nd 1 year. It is possible that
I just got a lot smarter with age, but I
ascribe a significant amount of the improvement
to the direct association of the attributes
to the file.

Casey Schaufler
casey@...aufler-ca.com
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