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From: "Loïc Yhuel" <loic.yhuel@gmail.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-integrity@vger.kernel.org,
	Matthew Garrett <matthewgarrett@google.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	javierm@redhat.com
Subject: Re: [PATCH] tpm: check event log version before reading final events
Date: Tue, 12 May 2020 13:40:10 +0200	[thread overview]
Message-ID: <CANMwUkg+2O2nK8z38HZw6z0NdLUPwj40m4DPKmn1sf9oDqG7Pw@mail.gmail.com> (raw)
In-Reply-To: <CAMj1kXFfLvUXU1A-7jnh3KMy5Qguhq0k9Cw=O0iBmbToowV_8A@mail.gmail.com>

Le mar. 12 mai 2020 à 08:45, Ard Biesheuvel <ardb@kernel.org> a écrit :
> So what functionality do we lose here? Can we still make meaningful
> use of the event log without the final log? I thought one was
> incomplete without the other?
The char driver (drivers/char/tpm/eventlog/efi.c), already ignores
efi.tpm_final_log
if the event log version isn't EFI_TCG2_EVENT_LOG_FORMAT_TCG_2.
So there currently no code making use of the final log contents on
those machines,
besides the two cases I patched which only try to determine its size.

I don't know if the table contains bad data, or just doesn't follow
the specification
and uses the older SHA-1 log format. If this is the case, perhaps we
could try to
support it, and modify the code to allow returning the additional
events it might
contain to the userspace.

  reply	other threads:[~2020-05-12 11:40 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12  4:01 [PATCH] tpm: check event log version before reading final events Loïc Yhuel
2020-05-12  6:44 ` Ard Biesheuvel
2020-05-12 11:40   ` Loïc Yhuel [this message]
2020-05-12 12:30     ` Ard Biesheuvel
2020-05-14 10:51       ` Jarkko Sakkinen
2020-05-14  1:09   ` Jarkko Sakkinen
2020-05-14  8:10     ` Ard Biesheuvel
2020-05-14 23:44       ` Jarkko Sakkinen
2020-05-12 17:45 ` Javier Martinez Canillas
2020-05-12 18:45 ` Jerry Snitselaar
2020-05-12 20:08 ` Matthew Garrett
2020-05-14 10:53   ` Jarkko Sakkinen
2020-05-14 11:28     ` Loïc Yhuel
2020-05-14 11:31       ` Ard Biesheuvel
2020-05-15  0:03         ` Jarkko Sakkinen
2020-05-14 11:33       ` Javier Martinez Canillas
2020-05-14 12:28         ` Ard Biesheuvel
2020-05-14 12:56           ` Javier Martinez Canillas
2020-05-14 13:04             ` Ard Biesheuvel
2020-05-14 13:51               ` Javier Martinez Canillas
2020-05-14 18:06                 ` Matthew Garrett
2020-05-15 15:55         ` Loïc Yhuel
2020-05-22 18:30 ` [tip: efi/urgent] " tip-bot2 for Loïc Yhuel

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