linux-kernel - Re: [PATCH 3/7] security: introduce kernel_fw_from

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Message-ID: <CAGXu5jJxEJQ5+05O-Q=W652O-fZ1WBVsUjb3d2JEwAAMF=fx-Q@mail.gmail.com>
Date:	Tue, 22 Jul 2014 13:55:19 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.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 3/7] security: introduce kernel_fw_from_file hook

On Tue, Jul 22, 2014 at 12:39 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> On Mon, Jul 14, 2014 at 3:31 PM, Kees Cook <keescook@...omium.org> wrote:
>> Yup, with this and the module hook, adding a similar hook for kexec
>> makes sense as well. A paranoid kernel doesn't want to trust anything
>> it's loading from userspace. :)
>
> Well I'm actually wondering if we could generalize requiring hooks or
> not for LSM as part of the general kobject definition. Then we
> wouldn't need to keep growing hooks for modules, firmware, kexec
> images, etc, but instead using the interfaces for kobjects and who
> depend on them. How that would actually look -- I'm not sure, but just
> a thought.

Yeah, there does seem to be a repeated "get a thing from userspace"
method here, but the interfaces have been rather scattered so far. I
haven't seen an obvious way to consolidate them yet.

-Kees

-- 
Kees Cook
Chrome OS Security
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