From patchwork Wed Dec 9 23:43:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 11962853 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F241C433FE for ; Wed, 9 Dec 2020 23:45:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB89C23B53 for ; Wed, 9 Dec 2020 23:45:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388783AbgLIXo6 (ORCPT ); Wed, 9 Dec 2020 18:44:58 -0500 Received: from mga05.intel.com ([192.55.52.43]:64561 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729888AbgLIXot (ORCPT ); Wed, 9 Dec 2020 18:44:49 -0500 IronPort-SDR: POqS6S5VEDraWMRyf/oOoZqfb+5d9KYmVkjFJGr3l5xD2hhSU0ADE17e3R+tz8whL9q44mGQvb SkaLT6O4yWpQ== X-IronPort-AV: E=McAfee;i="6000,8403,9830"; a="258884333" X-IronPort-AV: E=Sophos;i="5.78,407,1599548400"; d="scan'208";a="258884333" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2020 15:44:06 -0800 IronPort-SDR: T9FWHeo2oDg50/sJPx3lWE0JXdinCnXhf0c1QDPvFs9h0/wPf6GyVMs6g/fOwcdWfJSDWkGjXt 2r6QdhFMTgfA== X-IronPort-AV: E=Sophos;i="5.78,407,1599548400"; d="scan'208";a="333100013" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.255.229.49]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2020 15:44:05 -0800 From: Russ Weight To: mdf@kernel.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Cc: trix@redhat.com, lgoncalv@redhat.com, yilun.xu@intel.com, hao.wu@intel.com, matthew.gerlach@intel.com, Russ Weight Subject: [PATCH v8 1/7] fpga: sec-mgr: fpga security manager class driver Date: Wed, 9 Dec 2020 15:43:55 -0800 Message-Id: <20201209234401.78668-2-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201209234401.78668-1-russell.h.weight@intel.com> References: <20201209234401.78668-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Create the FPGA Security Manager class driver. The security manager provides interfaces to manage secure updates for the FPGA and BMC images that are stored in FLASH. The driver can also be used to update root entry hashes and to cancel code signing keys. The image type is encoded in the image file and is decoded by the HW/FW secure update engine. Signed-off-by: Russ Weight Signed-off-by: Xu Yilun Reviewed-by: Tom Rix --- v8: - Fixed grammatical error in Documentation/fpga/fpga-sec-mgr.rst v7: - Changed Date in documentation file to December 2020 v6: - Removed sysfs support and documentation for the display of the flash count, root entry hashes, and code-signing-key cancelation vectors. v5: - Added the devm_fpga_sec_mgr_unregister() function, following recent changes to the fpga_manager() implementation. - Changed some *_show() functions to use sysfs_emit() instead of sprintf( v4: - Changed from "Intel FPGA Security Manager" to FPGA Security Manager" and removed unnecessary references to "Intel". - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_ v3: - Modified sysfs handler check in check_sysfs_handler() to make it more readable. v2: - Bumped documentation dates and versions - Added Documentation/fpga/ifpga-sec-mgr.rst - Removed references to bmc_flash_count & smbus_flash_count (not supported) - Split ifpga_sec_mgr_register() into create() and register() functions - Added devm_ifpga_sec_mgr_create() - Removed typedefs for imgr ops --- .../ABI/testing/sysfs-class-fpga-sec-mgr | 5 + Documentation/fpga/fpga-sec-mgr.rst | 44 +++ Documentation/fpga/index.rst | 1 + MAINTAINERS | 9 + drivers/fpga/Kconfig | 9 + drivers/fpga/Makefile | 3 + drivers/fpga/fpga-sec-mgr.c | 296 ++++++++++++++++++ include/linux/fpga/fpga-sec-mgr.h | 44 +++ 8 files changed, 411 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-fpga-sec-mgr create mode 100644 Documentation/fpga/fpga-sec-mgr.rst create mode 100644 drivers/fpga/fpga-sec-mgr.c create mode 100644 include/linux/fpga/fpga-sec-mgr.h diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr new file mode 100644 index 000000000000..f4211981441e --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr @@ -0,0 +1,5 @@ +What: /sys/class/fpga_sec_mgr/fpga_secX/name +Date: December 2020 +KernelVersion: 5.11 +Contact: Russ Weight +Description: Name of low level fpga security manager driver. diff --git a/Documentation/fpga/fpga-sec-mgr.rst b/Documentation/fpga/fpga-sec-mgr.rst new file mode 100644 index 000000000000..9f74c29fe63d --- /dev/null +++ b/Documentation/fpga/fpga-sec-mgr.rst @@ -0,0 +1,44 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======================================== +FPGA Security Manager Class Driver +======================================== + +The FPGA Security Manager class driver provides a common +API for user-space tools to manage updates for secure FPGA +devices. Device drivers that instantiate the Security +Manager class driver will interact with a HW secure update +engine in order to transfer new FPGA and BMC images to FLASH so +that they will be automatically loaded when the FPGA card reboots. + +A significant difference between the FPGA Manager and the FPGA +Security Manager is that the FPGA Manager does a live update (Partial +Reconfiguration) to a device, whereas the FPGA Security Manager +updates the FLASH images for the Static Region and the BMC so that +they will be loaded the next time the FPGA card boots. Security is +enforced by hardware and firmware. The security manager interacts +with the firmware to initiate an update, pass in the necessary data, +and collect status on the update. + +In addition to managing secure updates of the FPGA and BMC images, +the FPGA Security Manager update process may also be used to +program root entry hashes and cancellation keys for the FPGA static +region, the FPGA partial reconfiguration region, and the BMC. + +Secure updates make use of the request_firmware framework, which +requires that image files are accessible under /lib/firmware. A request +for a secure update returns immediately, while the update itself +proceeds in the context of a kernel worker thread. Sysfs files provide +a means for monitoring the progress of a secure update and for +retrieving error information in the event of a failure. + +Sysfs Attributes +================ + +The API includes a sysfs entry *name* to export the name of the parent +driver. It also includes an *update* sub-directory that can be used to +instantiate and monitor a secure update. + +See `<../ABI/testing/sysfs-class-fpga-sec-mgr>`__ for a full +description of the sysfs attributes for the FPGA Security +Manager. diff --git a/Documentation/fpga/index.rst b/Documentation/fpga/index.rst index f80f95667ca2..0b2f427042af 100644 --- a/Documentation/fpga/index.rst +++ b/Documentation/fpga/index.rst @@ -8,6 +8,7 @@ fpga :maxdepth: 1 dfl + fpga-sec-mgr .. only:: subproject and html diff --git a/MAINTAINERS b/MAINTAINERS index cb3cffe235ed..bb8bef5a2ec2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6977,6 +6977,15 @@ F: Documentation/fpga/ F: drivers/fpga/ F: include/linux/fpga/ +FPGA SECURITY MANAGER DRIVERS +M: Russ Weight +L: linux-fpga@vger.kernel.org +S: Maintained +F: Documentation/ABI/testing/sysfs-class-fpga-sec-mgr +F: Documentation/fpga/fpga-sec-mgr.rst +F: drivers/fpga/fpga-sec-mgr.c +F: include/linux/fpga/fpga-sec-mgr.h + FPU EMULATOR M: Bill Metzenthen S: Maintained diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index 5645226ca3ce..d66a1243b4ba 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -216,4 +216,13 @@ config FPGA_MGR_ZYNQMP_FPGA to configure the programmable logic(PL) through PS on ZynqMP SoC. +config FPGA_SEC_MGR + tristate "FPGA Security Manager" + help + The Security Manager class driver presents a common + user API for managing secure updates for FPGA + devices, including flash images for the FPGA static + region and for the BMC. Select this option to enable + updates for secure FPGA devices. + endif # FPGA diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index d8e21dfc6778..0e357262faed 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -21,6 +21,9 @@ obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA) += zynqmp-fpga.o obj-$(CONFIG_ALTERA_PR_IP_CORE) += altera-pr-ip-core.o obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT) += altera-pr-ip-core-plat.o +# FPGA Security Manager Framework +obj-$(CONFIG_FPGA_SEC_MGR) += fpga-sec-mgr.o + # FPGA Bridge Drivers obj-$(CONFIG_FPGA_BRIDGE) += fpga-bridge.o obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE) += altera-hps2fpga.o altera-fpga2sdram.o diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c new file mode 100644 index 000000000000..468379e0c825 --- /dev/null +++ b/drivers/fpga/fpga-sec-mgr.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * FPGA Security Manager + * + * Copyright (C) 2019-2020 Intel Corporation, Inc. + */ + +#include +#include +#include +#include +#include + +static DEFINE_IDA(fpga_sec_mgr_ida); +static struct class *fpga_sec_mgr_class; + +struct fpga_sec_mgr_devres { + struct fpga_sec_mgr *smgr; +}; + +#define to_sec_mgr(d) container_of(d, struct fpga_sec_mgr, dev) + +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct fpga_sec_mgr *smgr = to_sec_mgr(dev); + + return sysfs_emit(buf, "%s\n", smgr->name); +} +static DEVICE_ATTR_RO(name); + +static struct attribute *sec_mgr_attrs[] = { + &dev_attr_name.attr, + NULL, +}; + +static struct attribute_group sec_mgr_attr_group = { + .attrs = sec_mgr_attrs, +}; + +static const struct attribute_group *fpga_sec_mgr_attr_groups[] = { + &sec_mgr_attr_group, + NULL, +}; + +/** + * fpga_sec_mgr_create - create and initialize an FPGA + * security manager struct + * + * @dev: fpga security manager device from pdev + * @name: fpga security manager name + * @sops: pointer to a structure of fpga callback functions + * @priv: fpga security manager private data + * + * The caller of this function is responsible for freeing the struct + * with ifpg_sec_mgr_free(). Using devm_fpga_sec_mgr_create() instead + * is recommended. + * + * Return: pointer to struct fpga_sec_mgr or NULL + */ +struct fpga_sec_mgr * +fpga_sec_mgr_create(struct device *dev, const char *name, + const struct fpga_sec_mgr_ops *sops, void *priv) +{ + struct fpga_sec_mgr *smgr; + int id, ret; + + if (!name || !strlen(name)) { + dev_err(dev, "Attempt to register with no name!\n"); + return NULL; + } + + smgr = kzalloc(sizeof(*smgr), GFP_KERNEL); + if (!smgr) + return NULL; + + id = ida_simple_get(&fpga_sec_mgr_ida, 0, 0, GFP_KERNEL); + if (id < 0) + goto error_kfree; + + mutex_init(&smgr->lock); + + smgr->name = name; + smgr->priv = priv; + smgr->sops = sops; + + device_initialize(&smgr->dev); + smgr->dev.class = fpga_sec_mgr_class; + smgr->dev.parent = dev; + smgr->dev.id = id; + + ret = dev_set_name(&smgr->dev, "fpga_sec%d", id); + if (ret) { + dev_err(dev, "Failed to set device name: fpga_sec%d\n", id); + goto error_device; + } + + return smgr; + +error_device: + ida_simple_remove(&fpga_sec_mgr_ida, id); + +error_kfree: + kfree(smgr); + + return NULL; +} +EXPORT_SYMBOL_GPL(fpga_sec_mgr_create); + +/** + * fpga_sec_mgr_free - free an FPGA security manager created + * with fpga_sec_mgr_create() + * + * @smgr: FPGA security manager structure + */ +void fpga_sec_mgr_free(struct fpga_sec_mgr *smgr) +{ + ida_simple_remove(&fpga_sec_mgr_ida, smgr->dev.id); + kfree(smgr); +} +EXPORT_SYMBOL_GPL(fpga_sec_mgr_free); + +static void devm_fpga_sec_mgr_release(struct device *dev, void *res) +{ + struct fpga_sec_mgr_devres *dr = res; + + fpga_sec_mgr_free(dr->smgr); +} + +/** + * devm_fpga_sec_mgr_create - create and initialize an FPGA + * security manager struct + * + * @dev: fpga security manager device from pdev + * @name: fpga security manager name + * @sops: pointer to a structure of fpga callback functions + * @priv: fpga security manager private data + * + * This function is intended for use in a FPGA Security manager + * driver's probe function. After the security manager driver creates + * the fpga_sec_mgr struct with devm_fpga_sec_mgr_create(), it should + * register it with devm_fpga_sec_mgr_register(). + * The fpga_sec_mgr struct allocated with this function will be freed + * automatically on driver detach. + * + * Return: pointer to struct fpga_sec_mgr or NULL + */ +struct fpga_sec_mgr * +devm_fpga_sec_mgr_create(struct device *dev, const char *name, + const struct fpga_sec_mgr_ops *sops, void *priv) +{ + struct fpga_sec_mgr_devres *dr; + + dr = devres_alloc(devm_fpga_sec_mgr_release, sizeof(*dr), GFP_KERNEL); + if (!dr) + return NULL; + + dr->smgr = fpga_sec_mgr_create(dev, name, sops, priv); + if (!dr->smgr) { + devres_free(dr); + return NULL; + } + + devres_add(dev, dr); + + return dr->smgr; +} +EXPORT_SYMBOL_GPL(devm_fpga_sec_mgr_create); + +/** + * fpga_sec_mgr_register - register an FPGA security manager + * + * @smgr: fpga security manager struct + * + * Return: 0 on success, negative error code otherwise. + */ +int fpga_sec_mgr_register(struct fpga_sec_mgr *smgr) +{ + int ret; + + ret = device_add(&smgr->dev); + if (ret) + goto error_device; + + dev_info(&smgr->dev, "%s registered\n", smgr->name); + + return 0; + +error_device: + ida_simple_remove(&fpga_sec_mgr_ida, smgr->dev.id); + + return ret; +} +EXPORT_SYMBOL_GPL(fpga_sec_mgr_register); + +/** + * fpga_sec_mgr_unregister - unregister an FPGA security manager + * + * @mgr: fpga manager struct + * + * This function is intended for use in an FPGA security manager + * driver's remove() function. + */ +void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr) +{ + dev_info(&smgr->dev, "%s %s\n", __func__, smgr->name); + + device_unregister(&smgr->dev); +} +EXPORT_SYMBOL_GPL(fpga_sec_mgr_unregister); + +static int fpga_sec_mgr_devres_match(struct device *dev, void *res, + void *match_data) +{ + struct fpga_sec_mgr_devres *dr = res; + + return match_data == dr->smgr; +} + +static void devm_fpga_sec_mgr_unregister(struct device *dev, void *res) +{ + struct fpga_sec_mgr_devres *dr = res; + + fpga_sec_mgr_unregister(dr->smgr); +} + +/** + * devm_fpga_sec_mgr_register - resource managed variant of + * fpga_sec_mgr_register() + * + * @dev: managing device for this FPGA security manager + * @smgr: fpga security manager struct + * + * This is the devres variant of fpga_sec_mgr_register() for which the + * unregister function will be called automatically when the managing + * device is detached. + */ +int devm_fpga_sec_mgr_register(struct device *dev, struct fpga_sec_mgr *smgr) +{ + struct fpga_sec_mgr_devres *dr; + int ret; + + /* + * Make sure that the struct fpga_sec_mgr * that is passed in is + * managed itself. + */ + if (WARN_ON(!devres_find(dev, devm_fpga_sec_mgr_release, + fpga_sec_mgr_devres_match, smgr))) + return -EINVAL; + + dr = devres_alloc(devm_fpga_sec_mgr_unregister, sizeof(*dr), GFP_KERNEL); + if (!dr) + return -ENOMEM; + + ret = fpga_sec_mgr_register(smgr); + if (ret) { + devres_free(dr); + return ret; + } + + dr->smgr = smgr; + devres_add(dev, dr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_fpga_sec_mgr_register); + +static void fpga_sec_mgr_dev_release(struct device *dev) +{ +} + +static int __init fpga_sec_mgr_class_init(void) +{ + pr_info("FPGA Security Manager\n"); + + fpga_sec_mgr_class = class_create(THIS_MODULE, "fpga_sec_mgr"); + if (IS_ERR(fpga_sec_mgr_class)) + return PTR_ERR(fpga_sec_mgr_class); + + fpga_sec_mgr_class->dev_groups = fpga_sec_mgr_attr_groups; + fpga_sec_mgr_class->dev_release = fpga_sec_mgr_dev_release; + + return 0; +} + +static void __exit fpga_sec_mgr_class_exit(void) +{ + class_destroy(fpga_sec_mgr_class); + ida_destroy(&fpga_sec_mgr_ida); +} + +MODULE_DESCRIPTION("FPGA Security Manager Driver"); +MODULE_LICENSE("GPL v2"); + +subsys_initcall(fpga_sec_mgr_class_init); +module_exit(fpga_sec_mgr_class_exit) diff --git a/include/linux/fpga/fpga-sec-mgr.h b/include/linux/fpga/fpga-sec-mgr.h new file mode 100644 index 000000000000..f85665b79b9d --- /dev/null +++ b/include/linux/fpga/fpga-sec-mgr.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Header file for FPGA Security Manager + * + * Copyright (C) 2019-2020 Intel Corporation, Inc. + */ +#ifndef _LINUX_FPGA_SEC_MGR_H +#define _LINUX_FPGA_SEC_MGR_H + +#include +#include +#include + +struct fpga_sec_mgr; + +/** + * struct fpga_sec_mgr_ops - device specific operations + */ +struct fpga_sec_mgr_ops { +}; + +struct fpga_sec_mgr { + const char *name; + struct device dev; + const struct fpga_sec_mgr_ops *sops; + struct mutex lock; /* protect data structure contents */ + void *priv; +}; + +struct fpga_sec_mgr * +fpga_sec_mgr_create(struct device *dev, const char *name, + const struct fpga_sec_mgr_ops *sops, void *priv); + +struct fpga_sec_mgr * +devm_fpga_sec_mgr_create(struct device *dev, const char *name, + const struct fpga_sec_mgr_ops *sops, void *priv); + +int fpga_sec_mgr_register(struct fpga_sec_mgr *smgr); +int devm_fpga_sec_mgr_register(struct device *dev, + struct fpga_sec_mgr *smgr); +void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr); +void fpga_sec_mgr_free(struct fpga_sec_mgr *smgr); + +#endif