linux-kernel - Re: [RFC 2/2] initramfs with digital signature protection

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Message-ID: <20130205183008.GA14451@srcf.ucam.org>
Date:	Tue, 5 Feb 2013 18:30:08 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 2/2] initramfs with digital signature protection

On Tue, Feb 05, 2013 at 06:19:26PM +0000, Matthew Garrett wrote:
> On Tue, Feb 05, 2013 at 02:34:50PM +0200, Dmitry Kasatkin wrote:
> 
> > Digitally signed initramfs can be used to provide protected user-space
> > environment for initialization purpose. For example, LSM, IMA/EVM can be
> > securely initialized using such approach.
> 
> What stops an attacker from simply removing the signed image from the 
> initramfs and running modified versions of the same tools from the 
> unsigned image?

I'm sorry, ignore that - if the kernel's configured to do this, it'll 
panic if it can't find the signed image. Ok.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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