linux-kernel - Re: [PATCH v2 3/3] tpm: retrieve digest size of unknown algorithms with PCR read

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Message-ID: <8621eb6d-b252-4fb3-cb67-294f0aafb54c@huawei.com>
Date:   Tue, 18 Sep 2018 09:14:43 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC:     <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] tpm: retrieve digest size of unknown algorithms
 with PCR read

On 9/17/2018 11:16 PM, Jarkko Sakkinen wrote:
> On Mon, Sep 17, 2018 at 12:02:56PM +0200, Roberto Sassu wrote:
>> This code has the same behavior of tpm2_get_pcr_allocation(). If some
>> banks are not used, set the algorithm of the first unused to
>> TPM_ALG_ERROR.
> 
> My point is that maybe it would sense to use zero for that in order
> to make code a bit simpler.

Wouldn't be better to compare data with the same type? Since the alg_id
structure member stores an algorithm, it should be fine to compare its
value with an algorithm.

No problem to change that, but probably I should modify also
tpm_pcr_extend().

Roberto