From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Jiri Kosina <jkosina@suse.cz>
Cc: linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org
Subject: Re: [RFC] Second attempt at kernel secure boot support
Date: Wed, 31 Oct 2012 15:02:01 +0000 [thread overview]
Message-ID: <20121031150201.GA12394@srcf.ucam.org> (raw)
In-Reply-To: <alpine.LNX.2.00.1210311444080.12781@pobox.suse.cz>
On Wed, Oct 31, 2012 at 03:50:00PM +0100, Jiri Kosina wrote:
> Reading stored memory image (potentially tampered before reboot) from disk
> is basically DMA-ing arbitrary data over the whole RAM. I am currently not
> able to imagine a scenario how this could be made "secure" (without
> storing private keys to sign the hibernation image on the machine itself
> which, well, doesn't sound secure either).
shim generates a public and private key. It hands the kernel the private
key in a boot parameter and stores the public key in a boot variable. On
suspend, the kernel signs the suspend image with that private key and
discards it. On the next boot, shim generates a new key pair and hands
the new private key to the kernel along with the old public key. The
kernel verifies the suspend image before resuming it. The only way to
subvert this would be to be able to access kernel memory directly, which
means the attacker has already won.
Now someone just needs to write it.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2012-10-31 15:02 UTC|newest]
Thread overview: 224+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 14:40 [RFC] Second attempt at kernel secure boot support Matthew Garrett
2012-09-20 14:40 ` [PATCH V2 01/10] Secure boot: Add new capability Matthew Garrett
2012-09-28 3:10 ` Serge Hallyn
2012-10-20 0:15 ` joeyli
2012-10-20 9:02 ` Matt Fleming
2012-09-20 14:40 ` [PATCH V2 02/10] PCI: Lock down BAR access in secure boot environments Matthew Garrett
2012-09-20 14:40 ` [PATCH V2 03/10] x86: Lock down IO port " Matthew Garrett
2012-09-20 14:40 ` [PATCH V2 04/10] ACPI: Limit access to custom_method Matthew Garrett
2012-09-20 14:41 ` [PATCH V2 05/10] asus-wmi: Restrict debugfs interface Matthew Garrett
2012-09-20 14:41 ` [PATCH V2 06/10] Restrict /dev/mem and /dev/kmem in secure boot setups Matthew Garrett
2012-09-20 14:41 ` [PATCH V2 07/10] Secure boot: Add a dummy kernel parameter that will switch on Secure Boot mode Matthew Garrett
2012-09-20 16:32 ` Greg KH
2012-09-20 17:40 ` Josh Boyer
2012-09-25 13:08 ` [PATCH V3 " Josh Boyer
2012-10-29 9:00 ` joeyli
2012-10-30 17:48 ` Josh Boyer
2012-10-30 19:27 ` joeyli
2012-09-21 8:20 ` [PATCH V2 " joeyli
2012-09-28 3:20 ` Serge Hallyn
2012-09-20 14:41 ` [PATCH V2 08/10] efi: Enable secure boot lockdown automatically when enabled in firmware Matthew Garrett
2012-09-28 3:21 ` Serge Hallyn
2012-10-22 13:22 ` Matt Fleming
2012-09-20 14:41 ` [PATCH V2 09/10] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment Matthew Garrett
2012-09-20 14:41 ` [PATCH V2 10/10] SELinux: define mapping for new Secure Boot capability Matthew Garrett
2012-09-21 22:55 ` [RFC] Second attempt at kernel secure boot support Eric W. Biederman
2012-09-22 15:21 ` Matthew Garrett
2012-10-29 7:49 ` Jiri Kosina
2012-10-29 17:41 ` Matthew Garrett
2012-10-31 14:50 ` Jiri Kosina
2012-10-31 14:54 ` Josh Boyer
2012-10-31 14:59 ` Shea Levy
2012-10-31 15:55 ` Alan Cox
2012-10-31 15:55 ` Jiri Kosina
2012-10-31 17:03 ` Alan Cox
2012-10-31 17:01 ` Shea Levy
2012-10-31 17:17 ` Alan Cox
2012-10-31 17:10 ` Matthew Garrett
2012-10-31 17:21 ` Alan Cox
2012-10-31 17:17 ` Matthew Garrett
2012-10-31 17:39 ` Alan Cox
2012-10-31 17:37 ` Matthew Garrett
2012-10-31 17:49 ` Alan Cox
2012-10-31 17:45 ` Matthew Garrett
2012-10-31 20:14 ` Oliver Neukum
2012-10-31 21:58 ` Chris Friesen
2012-10-31 22:00 ` Jiri Kosina
2012-10-31 22:19 ` Oliver Neukum
2012-11-01 9:08 ` James Bottomley
2012-11-01 9:20 ` Jiri Kosina
2012-11-01 9:38 ` James Bottomley
2012-11-01 9:45 ` Jiri Kosina
2012-11-01 9:59 ` James Bottomley
2012-11-01 10:06 ` Jiri Kosina
2012-11-01 14:29 ` Eric Paris
2012-11-01 14:42 ` James Bottomley
2012-11-01 14:49 ` Matthew Garrett
2012-11-01 15:06 ` James Bottomley
2012-11-01 15:17 ` Eric Paris
2012-11-01 16:26 ` Matthew Garrett
2012-11-01 15:06 ` Alan Cox
2012-11-01 16:29 ` Matthew Garrett
2012-11-01 16:40 ` Alan Cox
2012-11-01 14:59 ` Eric Paris
2012-11-01 15:11 ` Alan Cox
2012-11-01 15:18 ` James Bottomley
2012-11-01 17:50 ` Eric Paris
2012-11-01 21:03 ` James Bottomley
2012-11-01 21:06 ` Matthew Garrett
2012-11-01 21:14 ` James Bottomley
2012-11-01 21:18 ` Matthew Garrett
2012-11-01 21:35 ` Alan Cox
2012-11-01 21:31 ` Alan Cox
2012-11-01 21:28 ` Matthew Garrett
2012-11-01 21:37 ` Alan Cox
2012-11-01 21:34 ` Matthew Garrett
2012-11-01 21:58 ` Alan Cox
2012-11-01 21:57 ` Matthew Garrett
2012-11-02 8:49 ` Eric W. Biederman
2012-11-02 14:00 ` Matthew Garrett
2012-11-02 22:03 ` Eric W. Biederman
2012-11-02 22:19 ` Chris Friesen
2012-11-02 23:46 ` Alan Cox
2012-11-03 0:23 ` Matthew Garrett
2012-11-03 0:55 ` Alan Cox
2012-11-03 0:20 ` Matthew Garrett
2012-11-03 0:47 ` Eric W. Biederman
2012-11-03 1:03 ` Alan Cox
2012-11-03 1:43 ` Matthew Garrett
2012-11-03 16:31 ` Alan Cox
2012-11-03 16:37 ` Matthew Garrett
2012-11-03 16:37 ` Eric Paris
2012-11-03 16:42 ` Matthew Garrett
2012-11-02 17:19 ` Vivek Goyal
2012-11-01 14:46 ` Alan Cox
2012-11-01 15:04 ` Eric Paris
2012-11-01 20:27 ` Pavel Machek
2012-11-01 21:02 ` Chris Friesen
2012-11-02 15:48 ` Vivek Goyal
2012-11-02 16:54 ` Chris Friesen
2012-11-02 17:03 ` Vivek Goyal
2012-11-03 23:09 ` Jiri Kosina
2012-11-05 6:38 ` Eric W. Biederman
2012-11-05 14:40 ` Jiri Kosina
2012-11-05 15:31 ` Jiri Kosina
2012-11-05 15:37 ` Chris Friesen
2012-11-05 18:22 ` Vivek Goyal
2012-11-02 16:33 ` Pavel Machek
2012-11-02 16:52 ` James Bottomley
2012-11-02 16:54 ` Matthew Garrett
2012-11-02 17:48 ` James Bottomley
2012-11-02 17:54 ` Matthew Garrett
2012-11-02 17:57 ` James Bottomley
2012-11-02 18:04 ` Matthew Garrett
2012-11-02 19:18 ` Eric Paris
2012-11-02 23:38 ` James Bottomley
2012-11-03 0:22 ` Matthew Garrett
2012-11-03 12:03 ` James Bottomley
2012-11-03 13:46 ` Matthew Garrett
2012-11-03 22:56 ` James Bottomley
2012-11-04 4:28 ` Matthew Garrett
2012-11-04 9:14 ` James Bottomley
2012-11-04 13:52 ` Matthew Garrett
2012-11-05 6:14 ` Eric W. Biederman
2012-11-05 7:12 ` H. Peter Anvin
2012-11-05 7:24 ` Eric W. Biederman
2012-11-05 7:40 ` H. Peter Anvin
2012-11-05 8:50 ` Eric W. Biederman
2012-11-05 8:53 ` H. Peter Anvin
2012-11-05 12:38 ` Matthew Garrett
2012-11-05 13:44 ` Alan Cox
2012-11-05 13:46 ` Matthew Garrett
2012-11-05 19:16 ` Eric W. Biederman
2012-11-05 20:25 ` Matthew Garrett
2012-11-06 2:46 ` Eric W. Biederman
2012-11-06 3:12 ` Matthew Garrett
2012-11-06 3:36 ` Eric W. Biederman
2012-11-06 3:53 ` Matthew Garrett
2012-11-06 5:19 ` Eric W. Biederman
2012-11-06 5:34 ` Matthew Garrett
2012-11-06 7:56 ` Florian Weimer
2012-11-06 15:14 ` Chris Friesen
2012-11-06 15:19 ` Jiri Kosina
2012-11-06 21:51 ` Florian Weimer
2012-11-06 21:55 ` Matthew Garrett
2012-11-06 22:06 ` Florian Weimer
2012-11-06 22:31 ` Matthew Garrett
2012-11-06 22:49 ` Alan Cox
2012-11-06 22:47 ` Matthew Garrett
[not found] ` <CAMFK0gt7oAr4ArD8FmD8QE+i4g4rSTmQjbbLcjs02xwQeXGx-A@mail.gmail.com>
2012-11-07 14:55 ` Matthew Garrett
2012-11-08 10:18 ` James Courtier-Dutton
[not found] ` <CAAMvbhFF=kb8TJ4oE+40Zrx7HD1OkD0NOYj7QEZegZKGtqDm_A@mail.gmail.com>
2012-11-08 11:19 ` Alan Cox
2012-11-06 9:12 ` Alan Cox
2012-11-06 13:17 ` Matthew Garrett
2012-11-06 8:13 ` Valdis.Kletnieks
2012-11-05 8:20 ` James Bottomley
2012-11-05 12:36 ` Matthew Garrett
2012-11-04 11:53 ` Pavel Machek
2012-11-05 21:25 ` Florian Weimer
2012-11-02 14:55 ` Vivek Goyal
2012-11-01 10:12 ` Oliver Neukum
2012-10-31 17:21 ` Jiri Kosina
2012-10-31 15:56 ` Matthew Garrett
2012-10-31 17:08 ` Alan Cox
2012-10-31 17:08 ` Shea Levy
2012-10-31 16:04 ` Jiri Kosina
2012-10-31 16:10 ` Josh Boyer
2012-10-31 15:02 ` Matthew Garrett [this message]
2012-10-31 15:05 ` Shea Levy
2012-10-31 15:09 ` Matthew Garrett
2012-11-02 15:30 ` Vivek Goyal
2012-11-02 15:42 ` Matthew Garrett
2012-11-02 15:52 ` Vivek Goyal
2012-11-02 16:22 ` Jiri Kosina
2012-11-02 18:30 ` Vivek Goyal
2012-11-02 16:35 ` Shuah Khan
2012-11-06 12:51 ` Jiri Kosina
2012-11-06 13:16 ` Matthew Garrett
2012-10-31 17:28 ` Takashi Iwai
2012-10-31 17:37 ` Matthew Garrett
2012-10-31 17:44 ` Alan Cox
2012-10-31 17:44 ` Matthew Garrett
2012-10-31 18:53 ` Takashi Iwai
2012-11-01 4:21 ` joeyli
2012-11-01 13:18 ` Alan Cox
2012-11-05 17:13 ` Takashi Iwai
2012-11-05 17:18 ` [PATCH RFC 0/4] Add firmware signature file check Takashi Iwai
2012-11-05 17:19 ` [PATCH RFC 1/4] scripts/sign-file: Allow specifying hash algorithm via -a option Takashi Iwai
2012-11-05 17:19 ` [PATCH RFC 2/4] scripts/sign-file: Support firmware signing Takashi Iwai
2012-11-05 17:20 ` [PATCH RFC 3/4] firmware: Add a signature check Takashi Iwai
2012-11-06 6:03 ` Mimi Zohar
2012-11-05 17:20 ` [PATCH RFC 4/4] firmware: Install signature files automatically Takashi Iwai
2012-11-05 18:12 ` [PATCH RFC 0/4] Add firmware signature file check Takashi Iwai
2012-11-05 20:43 ` Josh Boyer
2012-11-06 6:46 ` Takashi Iwai
2012-11-06 9:20 ` Alan Cox
2012-11-06 10:05 ` Takashi Iwai
2012-11-06 2:30 ` Ming Lei
2012-11-06 5:46 ` lee joey
2012-11-06 7:03 ` Takashi Iwai
2012-11-06 7:16 ` Ming Lei
2012-11-06 7:32 ` Takashi Iwai
2012-11-06 8:04 ` Ming Lei
2012-11-06 8:18 ` Takashi Iwai
2012-11-06 10:04 ` Ming Lei
2012-11-06 10:17 ` Takashi Iwai
2012-11-06 10:40 ` Ming Lei
2012-11-06 10:53 ` Takashi Iwai
2012-11-06 11:03 ` Ming Lei
2012-11-06 11:15 ` Alan Cox
[not found] ` <CAGB3EUTrSMDhja9Gu3h7nuZX+H2_owp8MnUNwbZuCW=_GuawqQ@mail.gmail.com>
2012-11-06 7:06 ` Takashi Iwai
2012-11-06 7:30 ` Ming Lei
2012-11-08 17:35 ` [PATCH RFC v2 " Takashi Iwai
2012-11-08 17:35 ` [PATCH RFC v2 1/4] firmware: Add the firmware signing support to scripts/sign-file Takashi Iwai
2012-11-23 6:51 ` joeyli
2012-11-08 17:35 ` [PATCH RFC v2 2/4] firmware: Add -a option " Takashi Iwai
2012-11-23 6:51 ` joeyli
2012-11-08 17:35 ` [PATCH RFC v2 3/4] firmware: Add support for signature checks Takashi Iwai
2012-11-23 6:56 ` joeyli
2012-11-23 7:34 ` Takashi Iwai
2012-11-08 17:35 ` [PATCH RFC v2 4/4] firmware: Install firmware signature files automatically Takashi Iwai
2012-11-23 6:52 ` joeyli
2012-11-06 0:01 ` [PATCH RFC 0/4] Add firmware signature file check David Howells
2012-11-06 7:01 ` Takashi Iwai
2012-11-06 0:05 ` David Howells
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121031150201.GA12394@srcf.ucam.org \
--to=mjg59@srcf.ucam.org \
--cc=jkosina@suse.cz \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).