linux-kernel - Re: [RFC PATCH 00/18 v3] Signature verification of hibernate snapshot

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Message-ID: <20130829213249.GA25940@amd.pavel.ucw.cz>
Date:	Thu, 29 Aug 2013 23:32:50 +0200
From:	Pavel Machek <pavel@...x.de>
To:	joeyli <jlee@...e.com>
Cc:	Florian Weimer <fw@...eb.enyo.de>, 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, David Howells <dhowells@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	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.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Gary Lin <GLin@...e.com>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [RFC PATCH 00/18 v3] Signature verification of hibernate
 snapshot

Hi!

> > >    - Bootloader store the public key to EFI boottime variable by itself
> > >    - Bootloader put The private key to S4SignKey EFI variable for forward to
> > >      kernel.
> > 
> > Is the UEFI NVRAM really suited for such regular updates?
> > 
> 
> Yes, Matthew raised this concern at before. I modified patch to load
> private key in efi stub kernel, before ExitBootServices(), that means we
> don't need generate key-pair at every system boot. So, the above
> procedure of efi bootloader will only run one time. 
> 
> User can enable SNAPSHOT_REGEN_KEYS kernel config to notify efi
> booloader regenerate key-pair for every S4 to improve security if he
> want. So, the key-pair re-generate procedure will only launched when S4
> resume, not every system boot.

How many writes can UEFI NVRAM survive? (Is it NOR?)

"every S4 resume" may be approximately "every boot" for some users...
									Pavel
-- 
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