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[2620:137:e000::1:20]) by mx.google.com with ESMTP id e22-20020a17090658d600b006fe5cf7e3b3si265149ejs.451.2022.05.17.13.04.17; Tue, 17 May 2022 13:04:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b="kh/jISYC"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233236AbiEQEcU (ORCPT + 99 others); Tue, 17 May 2022 00:32:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229895AbiEQEcR (ORCPT ); Tue, 17 May 2022 00:32:17 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5EF651C906; Mon, 16 May 2022 21:32:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652761935; x=1684297935; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=9vTNLR8rUQVmKegW4ri8IriB8Pt13olfhNyI0TM3Jqg=; b=kh/jISYCS8y+ke4zcAwV3ySH6aA/H+Y7f4MYr8ktE23y5wrq9H/kJD76 uy9XahrEEVGzeo9bdokrvYi+bClomDutVreHz5ue79dt0DaRyD2goZFZR CdsJHBvErg81oPDIn439EGHQsfbLKkbIVQy1/zIjSBjI+EAarbkinSYMK OeGo0oxnWNUh6O2aHyqKUQ7X1zQTGH6b2p6pIyIeulZqhp4E+AZXgT+kq i+hPhB8Mqnyt+LvoDbakWzwb6wQmPQRLstb1di26+NoP1JB4UCwou3wVb kXjs1W4wXt46mDzseu3atjAry2OWW04Ud1b9hqzsYifRviUuBhSirmXW/ w==; X-IronPort-AV: E=McAfee;i="6400,9594,10349"; a="270998493" X-IronPort-AV: E=Sophos;i="5.91,231,1647327600"; d="scan'208";a="270998493" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 May 2022 21:32:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,231,1647327600"; d="scan'208";a="568681022" Received: from yilunxu-optiplex-7050.sh.intel.com (HELO localhost) ([10.239.159.135]) by orsmga007.jf.intel.com with ESMTP; 16 May 2022 21:32:11 -0700 Date: Tue, 17 May 2022 12:24:40 +0800 From: Xu Yilun To: Russ Weight Cc: mdf@kernel.org, hao.wu@intel.com, lee.jones@linaro.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org, trix@redhat.com, marpagan@redhat.com, lgoncalv@redhat.com, matthew.gerlach@linux.intel.com, basheer.ahmed.muddebihal@intel.com, tianfei.zhang@intel.com Subject: Re: [PATCH v20 4/5] fpga: m10bmc-sec: expose max10 canceled keys in sysfs Message-ID: <20220517042440.GB40711@yilunxu-OptiPlex-7050> References: <20220516234941.592886-1-russell.h.weight@intel.com> <20220516234941.592886-5-russell.h.weight@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220516234941.592886-5-russell.h.weight@intel.com> X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 16, 2022 at 04:49:40PM -0700, Russ Weight wrote: > 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 > --- > 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 | 48 +++++++++++++++++++ > 2 files changed, 72 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 3f183202de3b..6c39adc6492d 100644 > --- a/drivers/fpga/intel-m10-bmc-sec-update.c > +++ b/drivers/fpga/intel-m10-bmc-sec-update.c > @@ -78,6 +78,51 @@ 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); > + > + WARN_ON(size % stride); Same concern. > + 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, > @@ -118,6 +163,9 @@ 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, > }; > > -- > 2.25.1