linux-kernel - Re: [PATCH v9 1/6] tpm: dynamically allocate the allocated

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Message-ID: <20190201133451.GA17861@linux.intel.com>
Date:   Fri, 1 Feb 2019 15:34:51 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     zohar@...ux.ibm.com, david.safford@...com, monty.wiseman@...com,
        matthewgarrett@...gle.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, silviu.vlasceanu@...wei.com
Subject: Re: [PATCH v9 1/6] tpm: dynamically allocate the allocated_banks
 array

On Fri, Feb 01, 2019 at 11:06:36AM +0100, Roberto Sassu wrote:
> This patch renames active_banks (member of tpm_chip) to allocated_banks,
> stores the number of allocated PCR banks in nr_allocated_banks (new member
> of tpm_chip), and replaces the static array with a pointer to a dynamically
> allocated array.
> 
> tpm2_get_pcr_allocation() determines if a PCR bank is allocated by checking
> the mask in the TPML_PCR_SELECTION structure returned by the TPM for
> TPM2_Get_Capability(). If a bank is not allocated, the TPM returns that
> bank in TPML_PCR_SELECTION, with all bits in the mask set to zero. In this
> case, the bank is not included in chip->allocated_banks, to avoid that TPM
> driver users unnecessarily calculate a digest for that bank.
> 
> One PCR bank with algorithm set to SHA1 is always allocated for TPM 1.x.
> 
> As a consequence of the introduction of nr_allocated_banks,
> tpm_pcr_extend() does not check anymore if the algorithm stored in tpm_chip
> is equal to zero.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko