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

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Message-ID: <alpine.LRH.2.11.1407210938310.30619@namei.org>
Date:	Mon, 21 Jul 2014 09:43:57 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Kees Cook <keescook@...omium.org>
cc:	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 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?


-- 
James Morris
<jmorris@...ei.org>

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