linux-kernel - Re: Add support for TCG2 log format on UEFI systems

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Message-ID: <CACdnJutCC7n++Nz5qy1YzmsSchEApDUvMH9-qpxYXckh-Dzf-Q@mail.gmail.com>
Date:   Mon, 1 Apr 2019 20:32:26 -0700
From:   Matthew Garrett <mjg59@...gle.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     tomas.winkler@...el.com,
        linux-integrity <linux-integrity@...r.kernel.org>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thiébaud Weksteen <tweek@...gle.com>
Subject: Re: Add support for TCG2 log format on UEFI systems

On Mon, Apr 1, 2019 at 4:52 PM Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
>
> On Wed, Feb 27, 2019 at 12:26:54PM -0800, Matthew Garrett wrote:
> > Identical to V4, but based on tpmdd-next
>
> OK, so on my GLK NUC I get valid final log and invalid event log
> after adding some extra klogs.
>
> I.e.
>
> -       if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
> +       if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {

Just to make sure - are you booting via the EFI boot stub? We need to
obtain the boot log before ExitBootServices() is called, so if you're
booting directly into the 32-bit entry point (eg, by using the "linux"
command in grub) then you won't get a log.