Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 5 Feb 2020 23:57:56 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     Roberto Sassu <roberto.sassu@huawei.com>
Cc:     zohar@linux.ibm.com, James.Bottomley@HansenPartnership.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 v2 1/8] tpm: Initialize crypto_id of allocated_banks to
 HASH_ALGO__LAST
Message-ID: <20200205215756.GA24468@linux.intel.com>
References: <20200205103317.29356-1-roberto.sassu@huawei.com>
 <20200205103317.29356-2-roberto.sassu@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200205103317.29356-2-roberto.sassu@huawei.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Feb 05, 2020 at 11:33:10AM +0100, Roberto Sassu wrote:
> chip->allocated_banks, an array of tpm_bank_info structures, contains the
> list of TPM algorithm IDs of allocated PCR banks. It also contains the
> corresponding ID of the crypto subsystem, so that users of the TPM driver
> can calculate a digest for a PCR extend operation.
> 
> However, if there is no mapping between TPM algorithm ID and crypto ID, the
> crypto_id field of tpm_bank_info remains set to zero (the array is
> allocated and initialized with kcalloc() in tpm2_get_pcr_allocation()).
> Zero should not be used as value for unknown mappings, as it is a valid
> crypto ID (HASH_ALGO_MD4).
> 
> Thus, initialize crypto_id to HASH_ALGO__LAST.
> 
> Fixes: 879b589210a9 ("tpm: retrieve digest size of unknown algorithms with PCR read")
> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> Cc: stable@vger.kernel.org

Cc should be first.

/Jarkko