linux-kernel - Re: A basic question about the security

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Date:	Thu, 24 Dec 2009 04:53:35 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	Michael Stone <michael@...top.org>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, David Lang <david@...g.hm>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Américo Wang <xiyou.wangcong@...il.com>
Subject: Re: A basic question about the security_* hooks

Casey Schaufler <casey@...aufler-ca.com> writes:

> I'm behind you 100%. Use the LSM. Your module is exactly why we have
> the blessed thing. Once we get a collection of otherwise unrelated
> LSMs the need for a stacker will be sufficiently evident that we'll
> be able to get one done properly.

My immediate impression is that the big limitation today is the
sharing of the void * security data members of strucutres.

Otherwise multiple security modules could be as simple as.
list_for_each(mod)
        if (mod->op(...) != 0)
		return -EPERM.

It isn't hard to multiplex a single data field into several with a
nice little abstraction.

With my maintainer of a general purpose kernel hat on I would love to
be able to build in all of the security modules and select at boot
time which ones were enabled.

Eric

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