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Message-ID: <CACdnJuu2Aq1mvdvooBgC3-1jfi3CPnZ6WGysOGc2Xizm-mbU0w@mail.gmail.com> Date: Thu, 14 Sep 2017 11:48:54 -0700 From: Matthew Garrett <mjg59@...gle.com> To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> Cc: Thiebaud Weksteen <tweek@...gle.com>, linux-efi@...r.kernel.org, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Matt Fleming <matt@...eblueprint.co.uk>, linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net, peterhuewe@....de, jgunthorpe@...idianresearch.com, tpmdd@...horst.net Subject: Re: [PATCH v2 2/3] efi: call get_event_log before ExitBootServices On Thu, Sep 14, 2017 at 11:43 AM, Jarkko Sakkinen <jarkko.sakkinen@...ux.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@...gle.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 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.
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