linux-kernel - Re: Regression from efi: call get_event

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]

Date:   Fri, 09 Mar 2018 09:03:13 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Jeremy Cline <jeremy@...ine.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Thiebaud Weksteen <tweek@...gle.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org,
        tpmdd-devel@...ts.sourceforge.net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression from efi: call get_event_log before ExitBootServices

On Fri, 2018-03-09 at 10:29 +0100, Hans de Goede wrote:
> Hi,
> 
> On 08-03-18 18:26, Jeremy Cline wrote:
> > 
> > On 03/08/2018 11:50 AM, Hans de Goede wrote:
[...]
> > > > The UEFI firmware does some measurements and so does shim. So
> > > > you should have some event logs. What version of shim are you
> > > > using? And also would be good to know if it's the same shim
> > > > version that Jeremy is using.
> > > 
> > > That is a very good question, I'm using: shim-ia32-13-0.7.x86_64, 
> > > which is the last version for F27 AFAICT.
> > 
> > All my tablet has installed is shim-0.8-10.x86_64, no shim-ia32.
> 
> Yes my bad, although if the kernel changes break booting on systems
> without the shim that is still good to know and something which
> we probably ought to fix.

My laptop is set up with secure boot but without shim using a shim
protocol thin layer to check the kernel signature against db variables:

https://git.kernel.org/pub/scm/linux/kernel/git/jejb/efitools.git/tree/ShimReplace.c

and I haven't seen any breakage, so not having a shim that does
measurements works for me all the way up to -rc4.

James