linux-kernel - Re: encrypted hibernation (was Re: Hibernation considerations)

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Message-ID: <20070811234356.GA19183@gallifrey>
Date:	Sun, 12 Aug 2007 00:43:56 +0100
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Vojtech Pavlik <vojtech@...e.cz>, seife@...e.de,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	pm list <linux-pm@...ts.linux-foundation.org>, david@...g.hm,
	Al Boldi <a1426z@...ab.com>
Subject: Re: encrypted hibernation (was Re: Hibernation considerations)

* Pavel Machek (pavel@....cz) wrote:
> Hi!
> 
> > > > Two things which I think would be nice to consider are:
> > > >    1) Encryption - I'd actually prefer if my luks device did not
> > > >        remember the key accross a hibernation; I want to be forced to
> > > >        reenter the phrase.  However I don't know what the best thing
> > > >        to do to partitions/applications using the luks device is.
> > > 
> > > Encryption is possible with both the userland hibernation (aka uswsusp) and
> > > TuxOnIce (formerly known as suspend2).  Still, I don't consider it as a "must
> > > have" feature for a framework to be generally useful (many users don't use it
> > > anyway).
> > 
> > If a user uses an encrypted filesystem, then he also needs an encrypted
> > swap and encrypted hibernation image: Otherwise the fileystem encryption
> > is not very useful.
> 
> Actually, we can do most of that stuff already. 
> 
> We can encrypt filesystems, encrypt swaps (LVM), and encrypt hibernation.

But can you do what my original question was; find a way to lose a luks
encrypted device key and cleanly unmount the filesystem that was
using it?  (and preferably put it all back together after resume).

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
\ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/
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