linux-kernel - Re: [PATCH V3 1/3] platform/x86/intel/sdsi: Add ioctl SPDM transport

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Message-ID: <b32cd809-7aed-62ed-1b6e-550221a3acbb@linux.intel.com>
Date: Fri, 7 Jun 2024 16:14:33 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "David E. Box" <david.e.box@...ux.intel.com>
cc: linux-doc@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>, 
    LKML <linux-kernel@...r.kernel.org>, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH V3 1/3] platform/x86/intel/sdsi: Add ioctl SPDM
 transport

On Wed, 5 Jun 2024, David E. Box wrote:

> Intel On Demand adds attestation and firmware measurement retrieval
> services through use of the protocols defined the Security Protocols and
> Data Measurement (SPDM) specification. SPDM messages exchanges are used to
> authenticate On Demand hardware and to retrieve signed measurements of the
> NVRAM state used to track feature provisioning and the NVRAM state used for
> metering services. These allow software to verify the authenticity of the
> On Demand hardware as well as the integrity of the reported silicon
> configuration.
> 
> Add an ioctl interface for sending SPDM messages through the On Demand
> mailbox. Provides commands to get a list of SPDM enabled devices, get the
> message size limits for SPDM Requesters and Responders, and perform an SPDM
> message exchange.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> Link: https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.0.1.pdf [1]
> ---

> +static int sdsi_spdm_do_command(struct sdsi_priv *priv,
> +				struct sdsi_spdm_command __user *argp)
> +{
> +	u32 req_size, rsp_size;
> +
> +	if (get_user(req_size, &argp->size))
> +		return -EFAULT;
> +
> +	if (req_size < 4 || req_size > sizeof(struct sdsi_spdm_message))

Hi David,

Is that 4 actually SPDM_HEADER_SIZE?

If my guess is correct, no need to send an updated version, I'll just fix 
it while applying.


-- 
 i.