linux-kernel - Re: [PATCH 1/4] module: add syscall to load module from fd

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Message-ID: <CAGXu5j+EZq+jwK+=yXkx-SxidLy0qwNne=DxGOiLtgzoYzV0Pg@mail.gmail.com>
Date:	Thu, 20 Sep 2012 20:07:14 -0700
From:	Kees Cook <keescook@...omium.org>
To:	James Morris <jmorris@...ei.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Arnd Bergmann <arnd@...db.de>,
	James Morris <james.l.morris@...cle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Paris <eparis@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/4] module: add syscall to load module from fd

On Thu, Sep 20, 2012 at 7:22 PM, James Morris <jmorris@...ei.org> wrote:
> On Thu, 20 Sep 2012, Kees Cook wrote:
>
>> Earlier proposals for appending signatures to kernel modules would not be
>> useful in Chrome OS, since it would involve adding an additional set of
>> keys to our kernel and builds for no good reason: we already trust the
>> contents of our root filesystem. We don't need to verify those kernel
>> modules a second time. Having to do signature checking on module loading
>> would slow us down and be redundant. All we need to know is where a
>> module is coming from so we can say yes/no to loading it.
>
> Just out of interest, has anyone else expressed interest in using this
> feature?

Yes, in the earlier threads, Mimi spoke up in favor of it as a
possible path for IMA to do signature checking. She sent patches that
updated the LSM hooks to include callback to IMA that were sent to the
lsm list:
http://marc.info/?l=linux-security-module&m=134739023306344&w=2

Serge and Eric both Acked the new hooks too.

-Kees

-Kees

-- 
Kees Cook
Chrome OS Security
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