From patchwork Mon Apr 12 20:09:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12198793 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 6191DC433ED for ; Mon, 12 Apr 2021 20:09:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F82961246 for ; Mon, 12 Apr 2021 20:09:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245644AbhDLUJs (ORCPT ); Mon, 12 Apr 2021 16:09:48 -0400 Received: from mga06.intel.com ([134.134.136.31]:53872 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245625AbhDLUJn (ORCPT ); Mon, 12 Apr 2021 16:09:43 -0400 IronPort-SDR: 63vrxUTwupgZsaIu2zutQ62YwOGktSAkl4MChM2fy3h+ISDVIgwo7P6H5FKajowyu4gtvkHZBw uLtlfcBvdN4g== X-IronPort-AV: E=McAfee;i="6200,9189,9952"; a="255595512" X-IronPort-AV: E=Sophos;i="5.82,216,1613462400"; d="scan'208";a="255595512" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Apr 2021 13:09:25 -0700 IronPort-SDR: YPKfpcN1smO9LnZDA+4hbgI4BgF+WM8spmH/YF0Tv5FM69H6h//RQzAP7W3NHnptwU43iyWE24 WcnxH3Aq1jsQ== X-IronPort-AV: E=Sophos;i="5.82,216,1613462400"; d="scan'208";a="388776122" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.251.8.207]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Apr 2021 13:09:24 -0700 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 v11 6/7] fpga: sec-mgr: enable cancel of secure update Date: Mon, 12 Apr 2021 13:09:15 -0700 Message-Id: <20210412200916.242151-7-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210412200916.242151-1-russell.h.weight@intel.com> References: <20210412200916.242151-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Extend the FPGA Security Manager class driver to include an update/cancel sysfs file that can be written to request that an update be canceled. The write may return EBUSY if the update has progressed to the point that it cannot be canceled by software or ENODEV if there is no update in progress. Signed-off-by: Russ Weight Reviewed-by: Tom Rix --- v11: - No change v10: - Rebased to 5.12-rc2 next - Updated Date and KernelVersion in ABI documentation v9: - Updated Date and KernelVersion in ABI documentation v8: - No change v7: - Changed Date in documentation file to December 2020 v6: - No change v5: - No change 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: - No change v2: - Bumped documentation date and version - Minor code cleanup per review comments --- .../ABI/testing/sysfs-class-fpga-sec-mgr | 10 ++++ drivers/fpga/fpga-sec-mgr.c | 59 +++++++++++++++++-- include/linux/fpga/fpga-sec-mgr.h | 1 + 3 files changed, 66 insertions(+), 4 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr index 2e1f60edf546..fba3066e2b69 100644 --- a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr +++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr @@ -17,6 +17,16 @@ Description: Write only. Write the filename of an image and Root Entry Hashes, and to cancel Code Signing Keys (CSK). +What: /sys/class/fpga_sec_mgr/fpga_secX/update/cancel +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight +Description: Write-only. Write a "1" to this file to request + that a current update be canceled. This request + will be rejected (EBUSY) if the programming phase + has already started or (ENODEV) if there is no + update in progress. + What: /sys/class/fpga_sec_mgr/fpga_secX/update/status Date: April 2021 KernelVersion: 5.13 diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c index 15bf19f9e83b..215631b40381 100644 --- a/drivers/fpga/fpga-sec-mgr.c +++ b/drivers/fpga/fpga-sec-mgr.c @@ -45,6 +45,23 @@ static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr, smgr->sops->cancel(smgr); } +static int progress_transition(struct fpga_sec_mgr *smgr, + enum fpga_sec_prog new_progress) +{ + int ret = 0; + + mutex_lock(&smgr->lock); + if (smgr->request_cancel) { + set_error(smgr, FPGA_SEC_ERR_CANCELED); + smgr->sops->cancel(smgr); + ret = -ECANCELED; + } else { + update_progress(smgr, new_progress); + } + mutex_unlock(&smgr->lock); + return ret; +} + static void progress_complete(struct fpga_sec_mgr *smgr) { mutex_lock(&smgr->lock); @@ -76,16 +93,20 @@ static void fpga_sec_mgr_update(struct work_struct *work) goto release_fw_exit; } - update_progress(smgr, FPGA_SEC_PROG_PREPARING); + if (progress_transition(smgr, FPGA_SEC_PROG_PREPARING)) + goto modput_exit; + ret = smgr->sops->prepare(smgr); if (ret != FPGA_SEC_ERR_NONE) { fpga_sec_dev_error(smgr, ret); goto modput_exit; } - update_progress(smgr, FPGA_SEC_PROG_WRITING); + if (progress_transition(smgr, FPGA_SEC_PROG_WRITING)) + goto done; + size = smgr->remaining_size; - while (size) { + while (size && !smgr->request_cancel) { blk_size = min_t(u32, size, WRITE_BLOCK_SIZE); size -= blk_size; ret = smgr->sops->write_blk(smgr, offset, blk_size); @@ -98,7 +119,9 @@ static void fpga_sec_mgr_update(struct work_struct *work) offset += blk_size; } - update_progress(smgr, FPGA_SEC_PROG_PROGRAMMING); + if (progress_transition(smgr, FPGA_SEC_PROG_PROGRAMMING)) + goto done; + ret = smgr->sops->poll_complete(smgr); if (ret != FPGA_SEC_ERR_NONE) fpga_sec_dev_error(smgr, ret); @@ -235,6 +258,7 @@ static ssize_t filename_store(struct device *dev, struct device_attribute *attr, } smgr->err_code = FPGA_SEC_ERR_NONE; + smgr->request_cancel = false; smgr->progress = FPGA_SEC_PROG_READING; reinit_completion(&smgr->update_done); schedule_work(&smgr->work); @@ -245,8 +269,32 @@ static ssize_t filename_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_WO(filename); +static ssize_t cancel_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fpga_sec_mgr *smgr = to_sec_mgr(dev); + bool cancel; + int ret = count; + + if (kstrtobool(buf, &cancel) || !cancel) + return -EINVAL; + + mutex_lock(&smgr->lock); + if (smgr->progress == FPGA_SEC_PROG_PROGRAMMING) + ret = -EBUSY; + else if (smgr->progress == FPGA_SEC_PROG_IDLE) + ret = -ENODEV; + else + smgr->request_cancel = true; + mutex_unlock(&smgr->lock); + + return ret; +} +static DEVICE_ATTR_WO(cancel); + static struct attribute *sec_mgr_update_attrs[] = { &dev_attr_filename.attr, + &dev_attr_cancel.attr, &dev_attr_status.attr, &dev_attr_error.attr, &dev_attr_remaining_size.attr, @@ -470,6 +518,9 @@ void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr) goto unregister; } + if (smgr->progress != FPGA_SEC_PROG_PROGRAMMING) + smgr->request_cancel = true; + mutex_unlock(&smgr->lock); wait_for_completion(&smgr->update_done); diff --git a/include/linux/fpga/fpga-sec-mgr.h b/include/linux/fpga/fpga-sec-mgr.h index 78f8dc51a508..e63e6437f394 100644 --- a/include/linux/fpga/fpga-sec-mgr.h +++ b/include/linux/fpga/fpga-sec-mgr.h @@ -73,6 +73,7 @@ struct fpga_sec_mgr { enum fpga_sec_prog progress; enum fpga_sec_prog err_state; /* progress state at time of failure */ enum fpga_sec_err err_code; /* security manager error code */ + bool request_cancel; bool driver_unload; void *priv; };