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

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Date:	Thu, 29 Aug 2013 08:01:45 +0800
From:	joeyli <jlee@...e.com>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	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>, Pavel Machek <pavel@....cz>,
	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 Florian, 

Thanks for your response.

於 三，2013-08-28 於 23:01 +0200，Florian Weimer 提到：
> * Chun-Yi Lee:
> 
> >  + EFI bootloader must generate RSA key-pair when system boot:

I should add more information on this sentence for mention need GenS4Key
runtime variable then re-generate key-pair.

Thanks!

> >    - 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.


Thanks a lot!
Joey Lee

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