Re: [PATCH v7 1/3 RESEND] block:sed-opal: SED Opal keystore

[Hannes Reinecke <hare@suse.de>]

On 7/21/23 23:19, gjoyce@linux.vnet.ibm.com wrote:
> From: Greg Joyce <gjoyce@linux.vnet.ibm.com>
> 
> Add read and write functions that allow SED Opal keys to stored
> in a permanent keystore.
> 
Probably state that these are dummy functions only.

> Signed-off-by: Greg Joyce <gjoyce@linux.vnet.ibm.com>
> Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev>
> ---
>   block/Makefile               |  2 +-
>   block/sed-opal-key.c         | 24 ++++++++++++++++++++++++
>   include/linux/sed-opal-key.h | 15 +++++++++++++++
>   3 files changed, 40 insertions(+), 1 deletion(-)
>   create mode 100644 block/sed-opal-key.c
>   create mode 100644 include/linux/sed-opal-key.h
> 
> diff --git a/block/Makefile b/block/Makefile
> index 46ada9dc8bbf..ea07d80402a6 100644
> --- a/block/Makefile
> +++ b/block/Makefile
> @@ -34,7 +34,7 @@ obj-$(CONFIG_BLK_DEV_ZONED)	+= blk-zoned.o
>   obj-$(CONFIG_BLK_WBT)		+= blk-wbt.o
>   obj-$(CONFIG_BLK_DEBUG_FS)	+= blk-mq-debugfs.o
>   obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o
> -obj-$(CONFIG_BLK_SED_OPAL)	+= sed-opal.o
> +obj-$(CONFIG_BLK_SED_OPAL)	+= sed-opal.o sed-opal-key.o
>   obj-$(CONFIG_BLK_PM)		+= blk-pm.o
>   obj-$(CONFIG_BLK_INLINE_ENCRYPTION)	+= blk-crypto.o blk-crypto-profile.o \
>   					   blk-crypto-sysfs.o
> diff --git a/block/sed-opal-key.c b/block/sed-opal-key.c
> new file mode 100644
> index 000000000000..16f380164c44
> --- /dev/null
> +++ b/block/sed-opal-key.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SED key operations.
> + *
> + * Copyright (C) 2022 IBM Corporation
> + *
> + * These are the accessor functions (read/write) for SED Opal
> + * keys. Specific keystores can provide overrides.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/sed-opal-key.h>
> +
> +int __weak sed_read_key(char *keyname, char *key, u_int *keylen)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +int __weak sed_write_key(char *keyname, char *key, u_int keylen)
> +{
> +	return -EOPNOTSUPP;
> +}

Hmm. We do have security/keys, which is using a 'struct key' for
their operations.
Why don't you leverage that structure?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
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