linux-kernel - Re: [PATCH 0/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150406132505.GB9978@amd>
Date:	Mon, 6 Apr 2015 15:25:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Alasdair Kergon <agk@...hat.com>, Neil Brown <neilb@...e.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 0/3] dm-crypt: Adds support for wiping key when doing
 suspend/hibernation

On Mon 2015-04-06 09:00:46, Mike Snitzer wrote:
> On Sun, Apr 05 2015 at  1:20pm -0400,
> Pali Rohár <pali.rohar@...il.com> wrote:
> 
> > This patch series increase security of suspend and hibernate actions. It allows
> > user to safely wipe crypto keys before suspend and hibernate actions starts
> > without race conditions on userspace process with heavy I/O.
> > 
> > To automatically wipe cryto key for <device> before hibernate action call:
> > $ dmsetup message <device> 0 key wipe_on_hibernation 1
> > 
> > To automatically wipe cryto key for <device> before suspend action call:
> > $ dmsetup message <device> 0 key wipe_on_suspend 1
> > 
> > (Value 0 after wipe_* string reverts original behaviour - to not wipe key)
> 
> Can you elaborate on the attack vector your changes are meant to protect
> against?  The user already authorized access, why is it inherently
> dangerous to _not_ wipe the associated key across these events?

Umm. You are using your notebook. It is unlikely to be stolen at that
point. You close the lid and board the airplane, stowing it in
overhead bin. There's much better chance of notebook being stolen now.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/