From: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
To: James Bottomley
<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
Cc: Alan Stern
<stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>,
David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Lee,
Chun-Yi" <joeyli.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
opensuse-kernel-stAJ6ESoqRxg9hUCZPvPmw@public.gmane.org,
"Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>,
Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>,
Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Vojtech Pavlik <vojtech-AlSwsSmVLrQ@public.gmane.org>,
Matt Fleming
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Greg KH
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
JKosina-IBi9RG/b67k@public.gmane.org,
Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>,
Herbert Xu
<herbert-F6s6mLieUQo7FNHlEwC/lvQIK84fMopw@public.gmane.org>,
"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Michal Marek <mmarek-AlSwsSmVLrQ@public.gmane.org>,
Gary Lin <GLin-IBi9RG/b67k@public.gmane.org>,
Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Lee, Chun-Yi" <jlee-IBi9RG/b67k@public.gmane.org>
Subject: Re: [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot
Date: Thu, 26 Sep 2013 02:27:30 +0200 [thread overview]
Message-ID: <20130926002730.GA26857@amd.pavel.ucw.cz> (raw)
In-Reply-To: <1380147414.18835.36.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
On Wed 2013-09-25 15:16:54, James Bottomley wrote:
> On Wed, 2013-09-25 at 17:25 -0400, Alan Stern wrote:
> > On Wed, 25 Sep 2013, David Howells wrote:
> >
> > > I have pushed some keyrings patches that will likely affect this to:
> > >
> > > http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-devel
> > >
> > > I intend to ask James to pull these into his next branch. If he's happy to do
> > > so, I can look at pulling at least your asymmetric keys patch on top of them.
> >
> > This suggests a point that I raised at the Linux Plumbers conference:
> >
> > Why are asymmetric keys used for verifying the hibernation image? It
> > seems that a symmetric key would work just as well. And it would be a
> > lot quicker to generate, because it wouldn't need any high-precision
> > integer computations.
>
> The reason is the desire to validate that the previous kernel created
> something which it passed on to the current kernel (in this case, the
> hibernation image) untampered with. To do that, something must be
> passed to the prior kernel that can be validated but *not* recreated by
> the current kernel.
I don't get this. Why is it important that current kernel can't
recreate the signature?
Current kernel is not considered malicious (if it were, you have worse
problems).
Pavel
PS: And yes, it would be nice to have
Documentation/power/swsusp-uefi.txt (or something) explaining the
design.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2013-09-26 0:27 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-15 0:56 [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot Lee, Chun-Yi
[not found] ` <1379206621-18639-1-git-send-email-jlee-IBi9RG/b67k@public.gmane.org>
2013-09-15 0:56 ` [PATCH V4 01/15] asymmetric keys: add interface and skeleton for implement signature generation Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 02/15] asymmetric keys: implement EMSA_PKCS1-v1_5-ENCODE in rsa Lee, Chun-Yi
2013-09-17 21:51 ` Dmitry Kasatkin
[not found] ` <CACE9dm-7HKz4VFR1bNTTFd-YpYhnkNVwiW81iXSJZbqjUTBR_Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-18 9:08 ` joeyli
2013-09-18 9:08 ` joeyli
2013-09-18 9:08 ` joeyli
2013-09-18 9:08 ` joeyli
2013-09-18 9:08 ` joeyli
2013-09-17 22:29 ` Dmitry Kasatkin
2013-09-23 16:49 ` Phil Carmody
[not found] ` <20130923164931.GD6772-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-09-26 7:08 ` joeyli
2013-09-15 0:56 ` [PATCH V4 03/15] asymmetric keys: separate the length checking of octet string from RSA_I2OSP Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 04/15] asymmetric keys: implement OS2IP in rsa Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 05/15] asymmetric keys: implement RSASP1 Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 06/15] asymmetric keys: support parsing PKCS #8 private key information Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 07/15] asymmetric keys: explicitly add the leading zero byte to encoded message Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 08/15] Hibernate: introduced RSA key-pair to verify signature of snapshot Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 09/15] Hibernate: generate and " Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH 10/15] Hibernate: Avoid S4 sign key data included in snapshot image Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 11/15] Hibernate: taint kernel when signature check fail Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 12/15] Hibernate: show the verification time for monitor performance Lee, Chun-Yi
2013-09-15 0:56 ` [PATCH V4 13/15] Hibernate: introduced SNAPSHOT_SIG_HASH config for select hash algorithm Lee, Chun-Yi
[not found] ` <1379206621-18639-14-git-send-email-jlee-IBi9RG/b67k@public.gmane.org>
2013-09-18 13:45 ` Pavel Machek
2013-09-26 1:43 ` joeyli
2013-09-26 1:43 ` joeyli
2013-09-26 1:43 ` joeyli
[not found] ` <20130918134535.GA3748-tWAi6jLit6GreWDznjuHag@public.gmane.org>
2013-09-26 1:43 ` joeyli
2013-09-26 1:43 ` joeyli
[not found] ` <1380159819.32302.24.camel@linux-s257.site>
2013-09-26 8:21 ` Pavel Machek
2013-09-15 0:57 ` [PATCH V4 14/15] Hibernate: notify bootloader regenerate key-pair for snapshot verification Lee, Chun-Yi
2013-09-15 0:57 ` [PATCH V4 15/15] Hibernate: adapt to UEFI secure boot with signature check Lee, Chun-Yi
2013-09-25 21:04 ` [RFC V4 PATCH 00/15] Signature verification of hibernate snapshot David Howells
2013-09-25 21:25 ` Alan Stern
2013-09-25 22:16 ` James Bottomley
[not found] ` <1380147414.18835.36.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2013-09-26 0:27 ` Pavel Machek [this message]
2013-09-26 4:40 ` joeyli
2013-09-26 4:40 ` joeyli
[not found] ` <20130926002730.GA26857-tWAi6jLit6GreWDznjuHag@public.gmane.org>
2013-09-26 2:32 ` James Bottomley
[not found] ` <1380162771.18835.47.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2013-09-26 6:24 ` Jiri Kosina
2013-09-26 14:44 ` James Bottomley
[not found] ` <1380206654.18835.56.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2013-09-26 14:48 ` Jiri Kosina
[not found] ` <alpine.LNX.2.00.1309261646150.18703-ztGlSCb7Y1iN3ZZ/Hiejyg@public.gmane.org>
2013-09-26 14:56 ` Vojtech Pavlik
2013-09-26 4:40 ` joeyli
2013-09-26 4:40 ` joeyli
2013-09-26 4:40 ` joeyli
2013-09-26 1:11 ` Alan Stern
2013-09-26 2:19 ` joeyli
[not found] ` <Pine.LNX.4.44L0.1309251723001.26508-100000-pYrvlCTfrz9XsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-09-26 2:19 ` joeyli
2013-09-26 2:19 ` joeyli
2013-09-26 2:19 ` joeyli
2013-09-26 2:19 ` joeyli
[not found] ` <1380161957.32302.42.camel@linux-s257.site>
2013-09-26 10:43 ` joeyli
2013-09-26 10:43 ` joeyli
2013-09-26 10:43 ` joeyli
[not found] ` <1380161957.32302.42.camel-ONCj+Eqt86TasUa73XJKwA@public.gmane.org>
2013-09-26 10:43 ` joeyli
2013-09-26 10:43 ` joeyli
[not found] ` <1380192218.32302.69.camel@linux-s257.site>
2013-09-26 12:06 ` Pavel Machek
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
[not found] ` <20130926120621.GA7537-tWAi6jLit6GreWDznjuHag@public.gmane.org>
2013-09-26 12:21 ` Michal Marek
[not found] ` <524426C3.1050501-AlSwsSmVLrQ@public.gmane.org>
2013-09-26 12:23 ` Vojtech Pavlik
2013-09-26 12:22 ` Vojtech Pavlik
2013-09-26 13:20 ` joeyli
[not found] ` <20130926122210.GA30225-AlSwsSmVLrQ@public.gmane.org>
2013-09-26 13:20 ` joeyli
2013-09-26 13:20 ` joeyli
2013-09-26 13:20 ` joeyli
2013-09-26 13:20 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 12:56 ` joeyli
2013-09-26 1:36 ` joeyli
2013-09-26 1:36 ` joeyli
[not found] ` <29408.1380143073-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2013-09-26 1:36 ` joeyli
2013-09-26 1:36 ` joeyli
2013-09-26 1:36 ` joeyli
2013-10-17 14:18 ` Rafael J. Wysocki
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