linux-kernel - Re: [PATCH v12 0/9] LSM: Multiple concurrent LSMs

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Message-ID: <CAGXu5jLBVj=r0pXBiNxSsbOWEUw8NastXK1ucFL2n1tyVKr47g@mail.gmail.com>
Date:	Tue, 8 Jan 2013 12:19:34 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	James Morris <jmorris@...ei.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	LSM <linux-security-module@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>,
	SE Linux <selinux@...ho.nsa.gov>,
	John Johansen <john.johansen@...onical.com>,
	Eric Paris <eparis@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v12 0/9] LSM: Multiple concurrent LSMs

On Tue, Jan 8, 2013 at 9:14 AM, Casey Schaufler <casey@...aufler-ca.com> wrote:
> On 1/8/2013 1:12 AM, James Morris wrote:
>> Yama is special-cased and can stay that way.
>
> Yama is *not* a special case, it is an example. It is the kind
> of new thing that provides security that is not access control.
> It was special cased at the request of distros because there was
> no general mechanism for including it along with the primary
> LSM.

I think he meant "there is a CONFIG to special-case Yama", but yes,
Yama is a good example. Now that finit_module has landed, I intend to
send another micro-LSM to provide logic for blocking modules when the
root devices is read-only.

It would be another example of an LSM that needs to be stacked with others.

-Kees

--
Kees Cook
Chrome OS Security
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