linux-kernel - Re: [PATCH V5 2/4] tpm: Reserve the TPM final events table

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Message-ID: <CAKv+Gu9GpmK7-kb2GJuhrL2Qau7ebqDdy4-LdwFDmPz-Os0quw@mail.gmail.com>
Date:   Thu, 2 May 2019 22:56:27 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Matthew Garrett <mjg59@...gle.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Bartosz Szczepanek <bsz@...ihalf.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: [PATCH V5 2/4] tpm: Reserve the TPM final events table

On Thu, 2 May 2019 at 20:04, Matthew Garrett <mjg59@...gle.com> wrote:
>
> On Thu, May 2, 2019 at 12:15 AM Ard Biesheuvel
> <ard.biesheuvel@...aro.org> wrote:
> >
> > (+ Ingo)
> >
> > On Tue, 30 Apr 2019 at 21:52, Matthew Garrett <mjg59@...gle.com> wrote:
> > >
> > > On Tue, Apr 30, 2019 at 6:07 AM Bartosz Szczepanek <bsz@...ihalf.com> wrote:
> > > >
> > > > I may be a little late with this comment, but I've just tested these
> > > > patches on aarch64 platform (from the top of jjs/master) and got
> > > > kernel panic ("Unable to handle kernel read", full log at the end of
> > > > mail). I think there's problem with below call to
> > > > tpm2_calc_event_log_size(), where physical address of efi.tpm_log is
> > > > passed as (void *) and never remapped:
> > >
> > > Yes, it looks like this is just broken. Can you try with the attached patch?
> >
> > I'm a bit uncomfortable with EFI code that is obviously broken and
> > untested being queued for the next merge window in another tree.
>
> The patchset was Cc:ed to linux-efi@. Is there anything else I should
> have done to ensure you picked it up rather than Jarkko?

No, I am not saying it was you who did anything wrong - Jarkko and I
should probably have aligned better. But my own testing wouldn't have
caught this particular issue either (I am still in the process of
getting access to ARM machines with a TPM), so it wouldn't have made a
huge difference in any case.