linux-kernel - Re: [PATCH v2 1/2] efi+tpm: Don't access event->count when it isn't mapped.

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Message-ID: <20190925151616.3glkehdrmuwtosn3@cantor>
Date:   Wed, 25 Sep 2019 08:16:16 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        Peter Jones <pjones@...hat.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        stable <stable@...r.kernel.org>, Lyude Paul <lyude@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Bartosz Szczepanek <bsz@...ihalf.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] efi+tpm: Don't access event->count when it isn't
 mapped.

On Wed Sep 25 19, Jarkko Sakkinen wrote:
>On Wed, Sep 25, 2019 at 12:25:05PM +0200, Ard Biesheuvel wrote:
>> On Wed, 25 Sep 2019 at 12:16, Jarkko Sakkinen
>> <jarkko.sakkinen@...ux.intel.com> wrote:
>> >
>> > From: Peter Jones <pjones@...hat.com>
>> >
>> > Some machines generate a lot of event log entries.  When we're
>> > iterating over them, the code removes the old mapping and adds a
>> > new one, so once we cross the page boundary we're unmapping the page
>> > with the count on it.  Hilarity ensues.
>> >
>> > This patch keeps the info from the header in local variables so we don't
>> > need to access that page again or keep track of if it's mapped.
>> >
>> > Fixes: 44038bc514a2 ("tpm: Abstract crypto agile event size calculations")
>> > Cc: linux-efi@...r.kernel.org
>> > Cc: linux-integrity@...r.kernel.org
>> > Cc: stable@...r.kernel.org
>> > Signed-off-by: Peter Jones <pjones@...hat.com>
>> > Tested-by: Lyude Paul <lyude@...hat.com>
>> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>> > Acked-by: Matthew Garrett <mjg59@...gle.com>
>> > Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>>
>> Thanks Jarkko.
>>
>> Shall I take these through the EFI tree?
>
>Would be great, if you could because I already sent one PR with fixes for
>v5.4-rc1 yesterday.
>
>/Jarkko

My patch collides with this, so I will submit a v3 that applies on top of
these once I've run a test with all 3 applied on this t480s.