linux-kernel - Re: [PATCH v1 3/3] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

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Date:   Wed, 17 Mar 2021 15:02:59 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Richard Weinberger <richard.weinberger@...il.com>
Cc:     Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        James Bottomley <jejb@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>, kernel@...gutronix.de,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Horia Geantă <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Udit Agarwal <udit.agarwal@....com>,
        Jan Luebbe <j.luebbe@...gutronix.de>,
        David Gstir <david@...ma-star.at>,
        Franck LENORMAND <franck.lenormand@....com>,
        Sumit Garg <sumit.garg@...aro.org>, keyrings@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        LSM <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v1 3/3] KEYS: trusted: Introduce support for NXP
 CAAM-based trusted keys

Hello Richard,

On 17.03.21 00:14, Richard Weinberger wrote:
> Ahmad,
> 
> On Tue, Mar 16, 2021 at 6:24 PM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:
>> +#include <keys/trusted_caam.h>
>> +#include <keys/trusted-type.h>
>> +#include <linux/build_bug.h>
>> +#include <linux/key-type.h>
>> +#include <soc/fsl/caam-blob.h>
>> +
>> +struct caam_blob_priv *blobifier;
> 
> Who is using this pointer too?
> Otherwise I'd suggest marking it static.

You're right. Will do in v2.

>>  module_param_named(source, trusted_key_source, charp, 0);
>> -MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>> +MODULE_PARM_DESC(source, "Select trusted keys source (tpm, tee or caam)");
> 
> I didn't closely follow the previous discussions, but is a module
> parameter really the right approach?
> Is there also a way to set it via something like device tree?

Compiled-on sources are considered in the order: tpm, tee then caam.
Module parameters are the only override currently available.

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