linux-kernel - Re: [PATCH] LSM: ModPin LSM for module loading restrictions

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Message-ID: <20131016151831.GE5186@outflux.net>
Date:	Wed, 16 Oct 2013 08:18:31 -0700
From:	Kees Cook <keescook@...omium.org>
To:	James Morris <james.l.morris@...cle.com>
Cc:	James Morris <jmorris@...ei.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Casey Schaufler <casey@...aufler-ca.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH] LSM: ModPin LSM for module loading restrictions

Hi James,

On Mon, Sep 23, 2013 at 06:45:35PM -0700, Kees Cook wrote:
> [+rusty]
> 
> On Mon, Sep 23, 2013 at 6:28 PM, James Morris <jmorris@...ei.org> wrote:
> > On Tue, 24 Sep 2013, James Morris wrote:
> >
> >> On Fri, 20 Sep 2013, Kees Cook wrote:
> >>
> >> > This LSM enforces that modules must all come from the same filesystem,
> >> > with the expectation that such a filesystem is backed by a read-only
> >> > device such as dm-verity or CDROM. This allows systems that have a
> >> > verified or unchanging filesystem to enforce module loading restrictions
> >> > without needing to sign the modules individually.
> >> >
> >> > Signed-off-by: Kees Cook <keescook@...omium.org>
> >>
> >> Are you using this for ChromeOS?
> 
> Yes. Chrome OS uses a read-only root filesystem that is backed by
> dm-verity. This lets us pin all module loading to that filesystem
> without needing per-module signatures.
> 
> > Also, you should CC Rusty on this.
> 
> Done! :)

Any update on this? It'd be nice to have it in linux-next.

Thanks,

-Kees

-- 
Kees Cook                                            @outflux.net
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