linux-kernel - RE: [PATCH 1/8] tpm: initialize crypto_id of allocated_banks to HASH_ALGO_

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Date:   Thu, 30 Jan 2020 16:11:12 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "james.bottomley@...senpartnership.com" 
        <james.bottomley@...senpartnership.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>
CC:     "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Silviu Vlasceanu <Silviu.Vlasceanu@...wei.com>
Subject: RE: [PATCH 1/8] tpm: initialize crypto_id of allocated_banks to
 HASH_ALGO__LAST

> -----Original Message-----
> From: Jarkko Sakkinen [mailto:jarkko.sakkinen@...ux.intel.com]
> Sent: Thursday, January 30, 2020 9:48 AM
> To: Roberto Sassu <roberto.sassu@...wei.com>; zohar@...ux.ibm.com;
> james.bottomley@...senpartnership.com; linux-integrity@...r.kernel.org
> Cc: linux-security-module@...r.kernel.org; linux-kernel@...r.kernel.org;
> Silviu Vlasceanu <Silviu.Vlasceanu@...wei.com>
> Subject: Re: [PATCH 1/8] tpm: initialize crypto_id of allocated_banks to
> HASH_ALGO__LAST
> 
> On Mon, 2020-01-27 at 18:04 +0100, Roberto Sassu wrote:
> > chip->allocated_banks 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 in chip->allocated_banks 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).
> >
> > This patch initializes crypto_id to HASH_ALGO__LAST.
> >
> > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>---
> 
> Remarks:
> 
> * After the subsystem tag, short summary starts with a capital lettter.
> * Missing fixes tag and cc tag to stable.
> * A struct called allocated_banks does not exist.
> * Please prefer using an imperative sentence when describing the action
>   to take e.g. "Thus, initialize crypto_id to HASH_ALGO__LAST".

Thanks. I will fix these issues in the next version of the patch set.

Roberto

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