From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Roberto Sassu <roberto.sassu@huawei.com>
Cc: zohar@linux.ibm.com, david.safford@ge.com, monty.wiseman@ge.com,
linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, silviu.vlasceanu@huawei.com,
stable@vger.kernel.org
Subject: Re: [PATCH v5 6/7] tpm: ensure that the output of PCR read contains the correct digest size
Date: Mon, 19 Nov 2018 16:33:57 +0200 [thread overview]
Message-ID: <20181119143357.GG8755@linux.intel.com> (raw)
In-Reply-To: <a259a629-def7-b538-2a54-8ca6bfbe772a@huawei.com>
On Mon, Nov 19, 2018 at 09:14:00AM +0100, Roberto Sassu wrote:
> On 11/18/2018 8:32 AM, Jarkko Sakkinen wrote:
> > On Fri, Nov 16, 2018 at 05:06:48PM +0100, Roberto Sassu wrote:
> > > On 11/16/2018 2:41 PM, Jarkko Sakkinen wrote:
> > > > On Wed, Nov 14, 2018 at 04:31:07PM +0100, Roberto Sassu wrote:
> > > > > This patch protects against data corruption that could happen in the bus,
> > > > > by checking that that the digest size returned by the TPM during a PCR read
> > > > > matches the size of the algorithm passed to tpm2_pcr_read().
> > > > >
> > > > > This check is performed after information about the PCR banks has been
> > > > > retrieved.
> > > > >
> > > > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > > > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > > > > Cc: stable@vger.kernel.org
> > > >
> > > > Missing fixes tag.
> > >
> > > Before this patch set, tpm2_pcr_extend() always copied 20 bytes from the
> > > output sent by the TPM.
> > >
> > > Roberto
> >
> > Aah, right, of course. Well the patch set is ATM somewhat broken because
> > this would require a fixes tag that points to a patch insdie the patch
> > set.
> >
> > Probably good way to fix the issue is to just merge this with the
> > earlier commit.
>
> Unfortunately, it is not possible. The exact digest size has been
> introduced with patch 5/7.
I put this in simple terms: if I merge 5/7 the driver will be broken.
Any commit in the patch set should not leave the tree in broken state.
That implies that 5/7 and 6/7 cannot be separate commits.
/Jarkko
next prev parent reply other threads:[~2018-11-19 14:34 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 15:31 [PATCH v5 0/7] tpm: retrieve digest size of unknown algorithms from TPM Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 1/7] tpm: dynamically allocate the allocated_banks array Roberto Sassu
2018-11-16 13:36 ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 2/7] tpm: remove definition of TPM2_ACTIVE_PCR_BANKS Roberto Sassu
2018-11-16 13:38 ` Jarkko Sakkinen
2018-11-28 7:50 ` Roberto Sassu
2018-11-28 12:17 ` Roberto Sassu
2018-11-29 12:04 ` Roberto Sassu
2018-11-30 19:41 ` Jarkko Sakkinen
2018-11-30 19:45 ` Jarkko Sakkinen
2018-11-30 22:18 ` Jarkko Sakkinen
2018-12-03 9:59 ` Roberto Sassu
2018-12-03 17:31 ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 3/7] tpm: rename and export tpm2_digest and tpm2_algorithms Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 4/7] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm Roberto Sassu
2018-11-16 13:41 ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 5/7] tpm: retrieve digest size of unknown algorithms with PCR read Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 6/7] tpm: ensure that the output of PCR read contains the correct digest size Roberto Sassu
2018-11-16 13:41 ` Jarkko Sakkinen
2018-11-16 16:06 ` Roberto Sassu
2018-11-18 7:32 ` Jarkko Sakkinen
2018-11-19 8:14 ` Roberto Sassu
2018-11-19 14:33 ` Jarkko Sakkinen [this message]
2018-11-19 15:09 ` Roberto Sassu
2018-11-19 16:07 ` Jarkko Sakkinen
2018-11-28 8:40 ` Roberto Sassu
2018-11-28 19:19 ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 7/7] tpm: pass an array of tpm_bank_list structures to tpm_pcr_extend() Roberto Sassu
2018-11-16 15:03 ` Jarkko Sakkinen
2018-11-16 15:55 ` Roberto Sassu
2018-11-18 7:27 ` Jarkko Sakkinen
2018-11-19 4:57 ` Mimi Zohar
2018-11-19 8:16 ` Roberto Sassu
2018-11-19 14:33 ` Mimi Zohar
2018-11-19 14:39 ` Jarkko Sakkinen
2018-11-18 7:29 ` Jarkko Sakkinen
2018-11-19 8:22 ` Roberto Sassu
2018-11-19 14:42 ` Jarkko Sakkinen
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