linux-kernel - Re: [PATCH v0 1/8] hw-bound-key: introducing the generic structure

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Date:   Wed, 12 Oct 2022 11:52:15 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Pankaj Gupta <pankaj.gupta@....com>
Cc:     a.fatoum@...gutronix.de, gilad@...yossef.com, Jason@...c4.com,
        jejb@...ux.ibm.com, zohar@...ux.ibm.com, dhowells@...hat.com,
        sumit.garg@...aro.org, david@...ma-star.at, michael@...le.cc,
        john.ernberg@...ia.se, jmorris@...ei.org, serge@...lyn.com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        j.luebbe@...gutronix.de, ebiggers@...nel.org, richard@....at,
        keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, sahil.malhotra@....com,
        kshitiz.varshney@....com, horia.geanta@....com, V.Sethi@....com
Subject: Re: [PATCH v0 1/8] hw-bound-key: introducing the generic structure

On Thu, Oct 06, 2022 at 06:38:30PM +0530, Pankaj Gupta wrote:
> Hardware bound keys buffer has additional information,
> that will be accessed using this new structure.

I don't really understand what I should get from this.

It lacks motivation and function of this structure, even
the name of the structure.

Hardware bound key does not mean anything at all without
a context. I don't know what it is.

> 
> structure members are:
> - flags, flags for hardware specific information.
> - key_sz, size of the plain key.

Who cares listing member names?

> 
> Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
> ---
>  include/linux/hw_bound_key.h | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 include/linux/hw_bound_key.h
> 
> diff --git a/include/linux/hw_bound_key.h b/include/linux/hw_bound_key.h
> new file mode 100644
> index 000000000000..e7f152410438
> --- /dev/null
> +++ b/include/linux/hw_bound_key.h
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0-only
> + *
> + * Copyright 2022 NXP
> + * Author: Pankaj Gupta <pankaj.gupta@....com>

Formatting here is incorrect and there is no such license in
existence as "GPL-2.0-only".

Should probably be:

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2022 NXP Semiconductors N.V.
 */

Author-field is redundant as it is part of the git metadata.
Also it is inaccurate description of authorship, as a file
can have multiple contributors over time.

This all is documented in 

https://www.kernel.org/doc/html/latest/process/license-rules.html

> + */
> +
> +#ifndef _HW_BOUND_KEY_H
> +#define _HW_BOUND_KEY_H
> +
> +#include "types.h"
> +
> +struct hw_bound_key_info {
> +	/* Key types specific to the hw. [Implementation Defined]
> +	 */
> +	uint8_t flags;
> +	uint8_t reserved;
> +	/* Plain key size.
> +	 */
> +	uint16_t key_sz;
> +};
> +
> +#define set_hbk_info(hbk_info, hw_flags, key_len) do {\
> +	hbk_info->flags = hw_flags;\
> +	hbk_info->key_sz = key_len;\
> +} while (0)
> +
> +#endif /* _HW_BOUND_KEY_H */
> -- 
> 2.17.1
> 

BR, Jarkko