linux-kernel - Re: [PATCH v3 5/5] tpm: ensure that output of PCR read contains the correct digest size

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Message-ID: <alpine.DEB.2.21.1810302151580.5058@jsakkine-mobl1>
Date:   Tue, 30 Oct 2018 21:52:45 +0200 (EET)
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
cc:     jarkko.sakkinen@...ux.intel.com, zohar@...ux.ibm.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, silviu.vlasceanu@...wei.com
Subject: Re: [PATCH v3 5/5] tpm: ensure that output of PCR read contains the
 correct digest size

On Tue, 30 Oct 2018, Roberto Sassu wrote:
> This patch ensures that the digest size returned by the TPM during a PCR
> read matches the size of the algorithm passed as argument to
> tpm2_pcr_read(). The check is performed after information about the PCR
> banks has been retrieved.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

What is the scenarion when this can happen (should be explained in
the commit message)?

/Jarkko