linux-kernel - Re: [PATCH 4/7] firmware_class: perform new LSM checks

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Message-ID: <1405911010.6083.3.camel@dhcp-9-2-203-236.watson.ibm.com>
Date:	Sun, 20 Jul 2014 22:50:10 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	James Morris <jmorris@...ei.org>
Cc:	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	James Morris <james.l.morris@...cle.com>,
	David Howells <dhowells@...hat.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	linux-firmware@...nel.org,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH 4/7] firmware_class: perform new LSM checks

On Mon, 2014-07-21 at 09:43 +1000, James Morris wrote: 
> On Sat, 19 Jul 2014, Kees Cook wrote:
> 
> [...]
> 
> > With the patch series, the LSM hook sees the userspace-touching loads:
> > - from kernel built-in: no LSM hook (nonsense to check the static list)
> > - direct from filesystem: called with file struct
> > - via uevent /sys "loading"/"data" interface: called with NULL file struct
> > - via uevent /sys "fd" interface: called with file struct
> 
> Thanks for the overview.  Can we get this documented in the LSM code?
> 
> > The reason the "fd" interface was added was because otherwise there's
> > no way for systems that use the uevent handler to communicate to the
> > kernel where the bytes being shoved into the "data" interface are
> > coming from.
> 
> Ok.
> 
> I gather folks have also thought about signing firmware?

>From an IMA perspective, this would be the same as for any other file,
just a new hook.

Mimi 

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