linux-kernel - Re: [PATCH v2 4/5] firmware: imx: add driver for NXP EdgeLock Enclave

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZlBwNbkFV1fcnPKE@pengutronix.de>
Date: Fri, 24 May 2024 12:47:17 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: Pankaj Gupta <pankaj.gupta@....com>
Cc: Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/5] firmware: imx: add driver for NXP EdgeLock Enclave

On Thu, May 23, 2024 at 04:19:35PM +0530, Pankaj Gupta wrote:
> NXP hardware IP(s) for secure-enclaves like Edgelock Enclave(ELE),
> are embedded in the SoC to support the features like HSM, SHE & V2X,
> using message based communication interface.
> 
> The secure enclave FW communicates on a dedicated messaging unit(MU)
> based interface(s) with application core, where kernel is running.
> It exists on specific i.MX processors. e.g. i.MX8ULP, i.MX93.
> 
> This patch adds the driver for communication interface to secure-enclave,
> for exchanging messages with NXP secure enclave HW IP(s) like EdgeLock
> Enclave (ELE) from Kernel-space, used by kernel management layers like
> - DM-Crypt.
> 
> Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
> ---
>  drivers/firmware/imx/Kconfig        |  12 +
>  drivers/firmware/imx/Makefile       |   2 +
>  drivers/firmware/imx/ele_base_msg.c | 286 +++++++++++++++++++
>  drivers/firmware/imx/ele_base_msg.h |  92 +++++++
>  drivers/firmware/imx/ele_common.c   | 239 ++++++++++++++++
>  drivers/firmware/imx/ele_common.h   |  43 +++
>  drivers/firmware/imx/se_ctrl.c      | 531 ++++++++++++++++++++++++++++++++++++
>  drivers/firmware/imx/se_ctrl.h      |  99 +++++++
>  include/linux/firmware/imx/se_api.h |  14 +
>  9 files changed, 1318 insertions(+)
> 
> +static int imx_fetch_se_soc_info(struct device *dev)
> +{
> +	struct se_if_priv *priv = dev_get_drvdata(dev);
> +	struct imx_se_node_info_list *info_list;
> +	const struct imx_se_node_info *info;
> +	struct soc_device_attribute *attr;
> +	struct soc_device *sdev;
> +	u64 serial_num;
> +	u16 soc_rev;
> +	int err = 0;
> +
> +	info = priv->info;
> +	info_list = (struct imx_se_node_info_list *)
> +				device_get_match_data(dev);
> +
> +	/* This function should be called once.
> +	 * Check if the soc_rev is zero to continue.
> +	 */
> +	if (priv->soc_rev)
> +		return err;
> +
> +	err = info->se_fetch_soc_info(dev, &soc_rev, &serial_num);
> +	if (err < 0) {
> +		dev_err(dev, "Failed to fetch SoC Info.");
> +		return err;
> +	}

This is called unconditionally but is not set for i.MX93. You should
either set it for i.MX93 or check it before calling it.

Sascha

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |