linux-kernel - Re: [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot

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Message-ID: <20130926122303.GB30225@suse.cz>
Date:	Thu, 26 Sep 2013 14:23:03 +0200
From:	Vojtech Pavlik <vojtech@...e.cz>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Pavel Machek <pavel@....cz>, joeyli <jlee@...e.com>,
	Alan Stern <stern@...land.harvard.edu>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-crypto@...r.kernel.org,
	opensuse-kernel@...nsuse.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Greg KH <gregkh@...uxfoundation.org>, JKosina@...e.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Gary Lin <GLin@...e.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot

On Thu, Sep 26, 2013 at 02:21:23PM +0200, Michal Marek wrote:

> > Is not it as simple as storing hash of hibernation image into NVRAM
> > and then verifying the hash matches the value in NVRAM on next
> > startup? No encryption needed. 
> 
> I think that part of the exercise is to minimize the number of writes to
> the NVRAM. The hash changes with every hibernation, obviously.

The key should, too. 

-- 
Vojtech Pavlik
Director SUSE Labs
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