linux-kernel - Re: [patch 0/5] Support for sanitization flag in low-level page allocator

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Message-ID: <20090526190249.GA1326@ucw.cz>
Date:	Tue, 26 May 2009 21:02:50 +0200
From:	Pavel Machek <pavel@....cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Larry H." <research@...reption.com>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [patch 0/5] Support for sanitization flag in low-level page
	allocator

Hi!

> > I could also imagine the suspend-to-disk code skipping
> > PG_sensitive pages when storing data to disk, and
> > replacing it with some magic signature so programs
> > that use special PG_sensitive buffers can know that
> > their crypto key disappeared after a restore.
> 
> Its irrelevant in the simple S2D case. I just patch other bits of the
> suspend image to mail me the new key later. The right answer is crypted
> swap combined with a hard disk password and thus a crypted and locked
> suspend image. Playing the "I must not miss any page which might be

uswsusp does have internal encryption, and can use dm_crypt encrypted
swap... So yes, we can do encrypted swap & s2disk today.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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