From patchwork Sat May 21 00:36:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12857626 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24A47C433F5 for ; Sat, 21 May 2022 00:38:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354251AbiEUAg0 (ORCPT ); Fri, 20 May 2022 20:36:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354272AbiEUAgS (ORCPT ); Fri, 20 May 2022 20:36:18 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D09F48B0AC; Fri, 20 May 2022 17:36:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1653093376; x=1684629376; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=W9jAjZCpIQNI1oUY2wo5mZyiZS+5a62kQu+A5Cn+WOg=; b=W58ipWxQe1XYcFoJ9X/6TrN4EareJmSodwSuQQxyLlZ3p3RPH+vTSv+4 JC9SkeN+aCq7Z7IcPHDxJX/sIN31PRj8M/E9hbU2bfmLVHbAE59YEVQBL GYnDu8/2qyoPbHZOftB5gV6nW9dmu82CXuwxFb5kDbeDwyy6yRcgssBnP r07s/Ivud4V5rQySxTMhgcN3GJGvj6rwXA3AVF4CnSYGnhekdFPYA67MF JDI2DCzuQwya02NdzS2284MkZs2zQBDtH9ZaBzmuLeFMd+rf1Y7zb0uB4 UTI3s61Ucu6lcUiwxwZTI76bDqC8WaKAE55W3Bi/m/qpx/I7z0DAc2HqC Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10353"; a="260365771" X-IronPort-AV: E=Sophos;i="5.91,240,1647327600"; d="scan'208";a="260365771" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2022 17:36:16 -0700 X-IronPort-AV: E=Sophos;i="5.91,240,1647327600"; d="scan'208";a="628430998" Received: from rhweight-mobl.amr.corp.intel.com (HELO rhweight-mobl.ra.intel.com) ([10.251.21.47]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2022 17:36:14 -0700 From: Russ Weight To: mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, lee.jones@linaro.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Cc: trix@redhat.com, marpagan@redhat.com, lgoncalv@redhat.com, matthew.gerlach@linux.intel.com, basheer.ahmed.muddebihal@intel.com, tianfei.zhang@intel.com, Russ Weight Subject: [PATCH v21 4/5] fpga: m10bmc-sec: expose max10 canceled keys in sysfs Date: Fri, 20 May 2022 17:36:06 -0700 Message-Id: <20220521003607.737734-5-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220521003607.737734-1-russell.h.weight@intel.com> References: <20220521003607.737734-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Extend the MAX10 BMC Secure Update driver to provide sysfs files to expose the 128 bit code signing key (CSK) cancellation vectors. These use the standard bitmap list format (e.g. 1,2-6,9). Each CSK is assigned an ID, a number between 0-127, during the signing process. CSK ID cancellation information is stored in 128-bit fields in write-once locations in flash. The cancellation of a CSK can be used to prevent the card from being rolled back to older images that were signed with a CSK that is now cancelled. Signed-off-by: Russ Weight Reviewed-by: Tom Rix Acked-by: Xu Yilun --- v21: - Replace WARN_ON(size % stride) with a more elaborate test. Return -EINVAL and write a message to the kernel log. Call WARN_ON_ONCE(). v20: - Added text to the commit message to further describe the cancellation of code signing keys. v19: - Change "card bmc" naming back to "m10 bmc" naming to be consistent with the parent driver. v18: - No change v17: - Update the Date and KernelVersion for the ABI documentation to Jul 2022 and 5.19 respectively. - Change "m10bmc" in symbol names to "cardbmc" to reflect the fact that the future devices will not necessarily use the MAX10. v16: - No Change v15: - Updated the Dates and KernelVersions in the ABI documentation v14: - No changes v13: - Updated ABI documentation date and kernel version v12: - Updated Date and KernelVersion fields in ABI documentation v11: - No change v10: - Changed the path expressions in the sysfs documentation to replace the n3000 reference with something more generic to accomodate other devices that use the same driver. v9: - Rebased to 5.12-rc2 next - Updated Date and KernelVersion in ABI documentation v8: - Previously patch 4/6, otherwise no change v7: - Updated Date and KernelVersion in ABI documentation v6: - Added WARN_ON() call for (size / stride) to ensure that the proper count is passed to regmap_bulk_read(). v5: - No change v4: - Moved sysfs files for displaying the code-signing-key (CSK) cancellation vectors from the FPGA Security Manger class driver to here. The m10bmc_csk_vector() and m10bmc_csk_cancel_nbits() functions are removed and the functionality from these functions is moved into a show_canceled_csk() function for for displaying the CSK vectors. - Added ABI documentation for new sysfs entries v3: - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_ - Changed "MAX10 BMC Secure Engine driver" to "MAX10 BMC Secure Update driver" - Removed wrapper functions (m10bmc_raw_*, m10bmc_sys_*). The underlying functions are now called directly. - Renamed get_csk_vector() to m10bmc_csk_vector() v2: - Replaced small function-creation macros for explicit function declarations. - Fixed get_csk_vector() function to properly apply the stride variable in calls to m10bmc_raw_bulk_read() - Added m10bmc_ prefix to functions in m10bmc_iops structure --- .../sysfs-driver-intel-m10-bmc-sec-update | 24 +++++++++ drivers/fpga/intel-m10-bmc-sec-update.c | 54 +++++++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-sec-update b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-sec-update index 1132e39b2125..ca5a34c1c31f 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-sec-update +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-sec-update @@ -28,6 +28,30 @@ Description: Read only. Returns the root entry hash for the BMC image underlying device supports it. Format: string. +What: /sys/bus/platform/drivers/intel-m10bmc-sec-update/.../security/sr_canceled_csks +Date: Jul 2022 +KernelVersion: 5.19 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the static region. The standard bitmap + list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-sec-update/.../security/pr_canceled_csks +Date: Jul 2022 +KernelVersion: 5.19 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the partial reconfiguration region. The + standard bitmap list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-sec-update/.../security/bmc_canceled_csks +Date: Jul 2022 +KernelVersion: 5.19 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the BMC. The standard bitmap list format + is used (e.g. "1,2-6,9"). + What: /sys/bus/platform/drivers/intel-m10bmc-sec-update/.../security/flash_count Date: Jul 2022 KernelVersion: 5.19 diff --git a/drivers/fpga/intel-m10-bmc-sec-update.c b/drivers/fpga/intel-m10-bmc-sec-update.c index 25b21f116976..65fec2a70901 100644 --- a/drivers/fpga/intel-m10-bmc-sec-update.c +++ b/drivers/fpga/intel-m10-bmc-sec-update.c @@ -78,6 +78,57 @@ DEVICE_ATTR_SEC_REH_RO(bmc, BMC_PROG_MAGIC, BMC_PROG_ADDR, BMC_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(sr, SR_PROG_MAGIC, SR_PROG_ADDR, SR_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(pr, PR_PROG_MAGIC, PR_PROG_ADDR, PR_REH_ADDR); +#define CSK_BIT_LEN 128U +#define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32) + +static ssize_t +show_canceled_csk(struct device *dev, u32 addr, char *buf) +{ + unsigned int i, stride, size = CSK_32ARRAY_SIZE * sizeof(u32); + struct m10bmc_sec *sec = dev_get_drvdata(dev); + DECLARE_BITMAP(csk_map, CSK_BIT_LEN); + __le32 csk_le32[CSK_32ARRAY_SIZE]; + u32 csk32[CSK_32ARRAY_SIZE]; + int ret; + + stride = regmap_get_reg_stride(sec->m10bmc->regmap); + if (size % stride) { + dev_err(sec->dev, + "CSK vector size (0x%x) not aligned to stride (0x%x)\n", + size, stride); + WARN_ON_ONCE(1); + return -EINVAL; + } + + ret = regmap_bulk_read(sec->m10bmc->regmap, addr, csk_le32, + size / stride); + if (ret) { + dev_err(sec->dev, "failed to read CSK vector: %x cnt %x: %d\n", + addr, size / stride, ret); + return ret; + } + + for (i = 0; i < CSK_32ARRAY_SIZE; i++) + csk32[i] = le32_to_cpu(((csk_le32[i]))); + + bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN); + bitmap_complement(csk_map, csk_map, CSK_BIT_LEN); + return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN); +} + +#define DEVICE_ATTR_SEC_CSK_RO(_name, _addr) \ +static ssize_t _name##_canceled_csks_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ return show_canceled_csk(dev, _addr, buf); } \ +static DEVICE_ATTR_RO(_name##_canceled_csks) + +#define CSK_VEC_OFFSET 0x34 + +DEVICE_ATTR_SEC_CSK_RO(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(sr, SR_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(pr, PR_PROG_ADDR + CSK_VEC_OFFSET); + #define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ static ssize_t flash_count_show(struct device *dev, @@ -125,6 +176,9 @@ static struct attribute *m10bmc_security_attrs[] = { &dev_attr_bmc_root_entry_hash.attr, &dev_attr_sr_root_entry_hash.attr, &dev_attr_pr_root_entry_hash.attr, + &dev_attr_sr_canceled_csks.attr, + &dev_attr_pr_canceled_csks.attr, + &dev_attr_bmc_canceled_csks.attr, NULL, };