linux-kernel - Re: [PATCH] PM / Hibernate: Fix memory corruption related to swap

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Message-Id: <20101203091508.9fabf04d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 3 Dec 2010 09:15:08 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Ondrej Zary <linux@...nbow-software.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] PM / Hibernate: Fix memory corruption related to swap

On Fri, 3 Dec 2010 00:40:36 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> There is a problem that swap pages allocated before the creation of
> a hibernation image can be released and used for storing the contents
> of different memory pages while the image is being saved.  Since the
> kernel stored in the image doesn't know of that, it causes memory
> corruption to occur after resume from hibernation, especially on
> systems with relatively small RAM that need to swap often.
> 
> This issue can be addressed by keeping the GFP_IOFS bits clear
> in gfp_allowed_mask during the entire hibernation, including the
> saving of the image, until the system is finally turned off or
> the hibernation is aborted.  Unfortunately, for this purpose
> it's necessary to rework the way in which the hibernate and
> suspend code manipulates gfp_allowed_mask.
> 
> This change is based on an earlier patch from Hugh Dickins.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> Reported-by: Ondrej Zary <linux@...nbow-software.org>
> Acked-by: Hugh Dickins <hughd@...gle.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thanks,
-Kame

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