linux-kernel - Re: [PATCH v2 2/6] s390/uv: Retrieve UV secrets support

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Message-ID: <20241008143607.27223-C-hca@linux.ibm.com>
Date: Tue, 8 Oct 2024 16:36:07 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: Steffen Eiden <seiden@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        Ingo Franzki <ifranzki@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Christoph Schlameuss <schlameuss@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Subject: Re: [PATCH v2 2/6] s390/uv: Retrieve UV secrets support

On Wed, Oct 02, 2024 at 06:05:28PM +0200, Steffen Eiden wrote:
> Provide a kernel API to retrieve secrets from the UV secret store.
> Add two new functions:
> * `uv_get_secret_metadata` - get metadata for a given secret identifier
> * `uv_retrieve_secret` - get the secret value for the secret index
> 
> With those two functions one can extract the secret for a given secret
> id, if the secret is retrievable.
> 
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
> ---
>  arch/s390/include/asm/uv.h | 131 ++++++++++++++++++++++++++++++++++++-
>  arch/s390/kernel/uv.c      | 127 ++++++++++++++++++++++++++++++++++-
>  2 files changed, 256 insertions(+), 2 deletions(-)

> +/** uv_list_secrets() - Do a List Secrets UVC
> + *  @buf: Buffer to write list into; size of one page

This is not kerneldoc style.

> +int uv_get_secret_metadata(const u8 secret_id[UV_SECRET_ID_LEN],
> +			   struct uv_secret_list_item_hdr *secret)
> +{
> +	struct uv_secret_list *buf;
> +	int rc;
> +
> +	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
> +	rc = find_secret(secret_id, buf, secret);
> +	kfree(buf);

	if (!buf) ...

error checking is missing.