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

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Message-ID: <CAKv+Gu8-Qg3Zdsqxwjms-+VEtVXfOqpfe-PU9hpGruswGLHeNg@mail.gmail.com>
Date:   Tue, 13 Mar 2018 08:02:01 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Thiebaud Weksteen <tweek@...gle.com>,
        Jeremy Cline <jeremy@...ine.org>,
        Javier Martinez Canillas <javierm@...hat.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 13 March 2018 at 07:59, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> On 13 March 2018 at 07:47, Hans de Goede <hdegoede@...hat.com> wrote:
>> Hi,
>>
>>
>> On 12-03-18 20:55, Thiebaud Weksteen wrote:
>>>
> ...
>>>
>>> Hans, you said you configured the tablet to use the 32-bit version of grub
>>> instead
>>> of 64. Why's that?
>>
>>
>> Because this tablet, like (almost?) all Bay Trail hardware has a 32 bit
>> UEFI,
>> even though the processor is 64 bit capable (AFAIK 64 bit Windows drivers
>> were
>> not ready in time so all Bay Trail devices shipped with a 32 bit Windows).
>>
>> So this is running a 32 bit grub which boots a 64 bit kernel.
>>
>>> Jeremy, could you confirm if you are building the kernel in 64bit mode? Is
>>> your Android install working? (that is, what happens if you boot
>>> Boot0000)?
>>
>>
>> AFAIK the kernel on Jeremy's tablet (which I initially installed) is 64 bit.
>>
>> Could the problem perhaps be that the new code for the TPM event-log is
>> missing some handling to deal with running on a 32 bit firmware? I know the
>> rest of the kernel has special code to deal with this.
>>
>
> That is a very good point, and I missed that this is a 64-bit kernel
> running on 32-bit UEFI.
>
> The TPM code does use efi_call_proto() directly,

*correctly*

> and now I am thinking
> it is perhaps the allocate_pages() call that simply only initializes
> the low 32-bits of log_tbl.
>
> Jeremy, could you please try initializing tcg2_protocol and log_tbl to
> NULL at the start of the function?