linux-kernel - Re: [PATCH 11/18] Hibernate: introduced RSA key-pair to verify signature of snapshot

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Date:	Thu, 05 Sep 2013 21:28:57 +0800
From:	joeyli <jlee@...e.com>
To:	Matt Fleming <matt@...sole-pimps.org>
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>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 11/18] Hibernate: introduced RSA key-pair to verify
 signature of snapshot

於 四，2013-09-05 於 11:31 +0100，Matt Fleming 提到：
> On Thu, 05 Sep, at 06:13:36PM, joeyli wrote:
> > This S4WakeKey is a VOLATILE variable that could not modify by
> > SetVariable() at runtime. So, it's read only even through efivars. 
> > 
> > Does it what your concern?
>  
> No, the UEFI spec probibits certain runtime functions from being
> executed concurrently on separate cpus and the spinlock used in the
> efivars code ensures that we adhere to that restriction. See table 31 in
> section 7.1 of the UEFI 2.4 spec for the list of services that are
> non-reentrant.
> 
> The problem isn't that we want to avoid simultaneous access to
> S4WakeKey, it's that we can't invoke any of the variable runtime service
> functions concurrently.
> 

I see! I will use efivar api to access EFI variable.

Thanks a lot!
Joey Lee

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