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

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Date:   Sat, 1 Feb 2020 19:10:04 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     Roberto Sassu <roberto.sassu@...wei.com>,
        "james.bottomley@...senpartnership.com" 
        <james.bottomley@...senpartnership.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "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

On Fri, Jan 31, 2020 at 08:33:10AM -0500, Mimi Zohar wrote:
> On Thu, 2020-01-30 at 16:11 +0000, Roberto Sassu wrote:
> > > -----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.
> 
> Jarkko, I realize this is a TPM patch, but this patch set is dependent
> on it.  When this patch is ready, could you create a topic branch,
> which both of us could merge?

WFM.

/Jarkko