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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Matthew Garrett <mjg59@google.com>
Cc: Thiebaud Weksteen <tweek@google.com>,
	linux-efi@vger.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	linux-kernel@vger.kernel.org, tpmdd-devel@lists.sourceforge.net,
	peterhuewe@gmx.de, jgunthorpe@obsidianresearch.com,
	tpmdd@selhorst.net
Subject: Re: [PATCH v2 2/3] efi: call get_event_log before ExitBootServices
Date: Thu, 14 Sep 2017 12:02:47 -0700	[thread overview]
Message-ID: <20170914190247.rrbdzdexjjywxipf@linux.intel.com> (raw)
In-Reply-To: <CACdnJuu2Aq1mvdvooBgC3-1jfi3CPnZ6WGysOGc2Xizm-mbU0w@mail.gmail.com>

On Thu, Sep 14, 2017 at 11:48:54AM -0700, Matthew Garrett wrote:
> On Thu, Sep 14, 2017 at 11:43 AM, Jarkko Sakkinen
> <jarkko.sakkinen@linux.intel.com> wrote:
> > On Mon, Sep 11, 2017 at 12:00:21PM +0200, Thiebaud Weksteen wrote:
> >> With TPM 2.0 specification, the event logs may only be accessible by
> >> calling an EFI Boot Service. Modify the EFI stub to copy the log area to
> >> a new Linux-specific EFI configuration table so it remains accessible
> >> once booted.
> >>
> >> When calling this service, it is possible to specify the expected format
> >> of the logs: TPM 1.2 (SHA1) or TPM 2.0 ("Crypto Agile"). For now, only the
> >> first format is retrieved.
> >>
> >> Signed-off-by: Thiebaud Weksteen <tweek@google.com>
> >
> > With a quick skim the code change looks good but I remember from
> > Matthew's talk that there was this issue that ExitBootServices() would
> > cause a yet another event?
> >
> > I guess you could manually synthetize that event by reading the PCR
> > values right after ExitBootServices()?
> 
> I think that would involve breaking SHA1… the information should be

You are absolutely right, was not thinking clearly :-)

> available in the TCG_TREE_FINAL_EVENTS configuration table, so it
> /should/ just be a matter of merging the events from that into the
> event log.

Right, it is available through runtime services. Why this isn't part
of the patch set?

/Jrakko

/Jarkko

  reply	other threads:[~2017-09-14 19:02 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-11 10:00 [PATCH v2 0/3] Call GetEventLog " Thiebaud Weksteen
2017-09-11 10:00 ` [PATCH v2 1/3] tpm: move tpm_eventlog.h outside of drivers folder Thiebaud Weksteen
2017-09-11 10:00 ` [PATCH v2 2/3] efi: call get_event_log before ExitBootServices Thiebaud Weksteen
     [not found]   ` <20170911100022.7251-3-tweek-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2017-09-13 14:49     ` kbuild test robot
     [not found]       ` <201709132252.uZyTCtDz%fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-09-13 16:28         ` Thiebaud Weksteen via tpmdd-devel
2017-09-14 10:24     ` [tpmdd-devel] " Javier Martinez Canillas
     [not found]       ` <1f25ebdc-ab90-517f-b580-991a7cb5e25a-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-09-18 12:11         ` Thiebaud Weksteen
2017-09-18 12:49           ` Javier Martinez Canillas
2017-09-14 18:43     ` Jarkko Sakkinen
     [not found]       ` <20170914184126.eevnstwq3i6fiq4j-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-09-14 18:48         ` Matthew Garrett
2017-09-14 19:02           ` Jarkko Sakkinen [this message]
     [not found]             ` <20170914190247.rrbdzdexjjywxipf-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-09-15  4:06               ` Jarkko Sakkinen
2017-09-18 12:28               ` Thiebaud Weksteen
     [not found]                 ` <CA+zpnLfs=DhW6kgbLV63_XzmKS7VnGGE0ecbFBZ0bu4wx3Jf+w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-18 17:56                   ` Jarkko Sakkinen
2017-09-11 10:00 ` [PATCH v2 3/3] tpm: parse TPM event logs based on EFI table Thiebaud Weksteen
     [not found]   ` <20170911100022.7251-4-tweek-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2017-09-11 16:47     ` Jason Gunthorpe
2017-09-12  8:48       ` Thiebaud Weksteen
     [not found]         ` <20170912084851.z3ednbeojawnyxk2-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2017-09-18 12:38           ` Thiebaud Weksteen
2017-09-18 16:28             ` Jason Gunthorpe
2017-09-13 16:27     ` kbuild test robot
     [not found]       ` <201709140034.ESdZA8H8%fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-09-13 16:43         ` Thiebaud Weksteen
2017-09-14 18:47   ` Jarkko Sakkinen
     [not found]     ` <20170914184732.uiypaz4yft777oc7-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-09-18 12:33       ` Thiebaud Weksteen
     [not found] ` <20170911100022.7251-1-tweek-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2017-09-13 18:59   ` [PATCH v2 0/3] Call GetEventLog before ExitBootServices Jarkko Sakkinen
2017-11-03 15:27   ` Jarkko Sakkinen
2017-09-14 10:21 ` [tpmdd-devel] " Javier Martinez Canillas

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