linux-kernel - Re: sign-file and detached PKCS#7 firmware signatures

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Date:	Tue, 19 May 2015 21:29:09 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	dhowells@...hat.com, Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>,
	Matthew Garrett <mjg59@...f.ucam.org>, keyrings@...ux-nfs.org,
	dmitry.kasatkin@...il.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: sign-file and detached PKCS#7 firmware signatures

Luis R. Rodriguez <mcgrof@...e.com> wrote:

> > Though you would still have to be careful with firmware loaded during the
> > initramfs phase.
> 
> Make sense, how about:
> 
> ---
> The $DIGEST_ALGORITHM needs to be enabled as built-in (=y) or modular
> (=m) in the running kernel and can differ from CONFIG_MODULE_SIG_HASH.
> If you are enabling the $DIGEST_ALGORITHM as a module take care to
> ensure that this module will also be present on the initramfs used as
> some modules within the initramfs may need it if using the

Some firmware signatures, not modules.

> firmware_class APIs and firmware signing has been enabled.
> ---

David
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