linux-kernel - Re: [RFC] Second attempt at kernel secure boot support

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Message-ID: <20121102145532.GE3300@redhat.com>
Date:	Fri, 2 Nov 2012 10:55:32 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Eric Paris <eparis@...isplace.org>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Jiri Kosina <jkosina@...e.cz>, Oliver Neukum <oneukum@...e.de>,
	Chris Friesen <chris.friesen@...band.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Josh Boyer <jwboyer@...il.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [RFC] Second attempt at kernel secure boot support

On Thu, Nov 01, 2012 at 10:29:17AM -0400, Eric Paris wrote:
> On Thu, Nov 1, 2012 at 5:59 AM, James Bottomley
> <James.Bottomley@...senpartnership.com> wrote:
> 
> > But that doesn't really help me: untrusted root is an oxymoron.
> 
> Imagine you run windows and you've never heard of Linux.  You like
> that only windows kernels can boot on your box and not those mean
> nasty hacked up malware kernels.  Now some attacker manages to take
> over your box because you clicked on that executable for young models
> in skimpy bathing suits.  That executable rewrote your bootloader to
> launch a very small carefully crafted Linux environment.  This

Rewrote bootloader on disk so that it gets executed next time? It
will not run as signature will not match.

Thanks
Vivek
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