From mboxrd@z Thu Jan 1 00:00:00 1970 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 546DBC433EF for ; Fri, 6 May 2022 01:41:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388075AbiEFBox (ORCPT ); Thu, 5 May 2022 21:44:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1387996AbiEFBo3 (ORCPT ); Thu, 5 May 2022 21:44:29 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D239E554AD; Thu, 5 May 2022 18:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651801247; x=1683337247; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=j8Pu8lD/llak8O7ELIsdTVSd0MJLc866Awr81ZvC1iY=; b=D4qldFrOxNjkyf9ftRLow2tdK9J5mck4ecoPXzr1LxHv5PQvaPq9yOB/ Epcf4bGvIwoqP9j6VkCKInqOA9C3AWCrh78jSPzLk9nWamNmKUUbG0MjG HmXrRI5hJd93sqHy30tb+miynJnkJPQnxI0CFQYDEVJQMTBKeeldqsO5Q YxoNknz+ji2wupaQfilt2n0rL3TuoUP4Z238i6V+47cq/0zTbTn3yOT5a jsd/r2r+eYl+vA0XuuE+MSpXBPJyhOT5O9/GcWHCLtPmqw0zBelD5WB9n owmHjO9EWTOyLbMPpSU/ogmxTK+L/jN0alIZK8IYqsj1wVXHTpulVWIa4 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10338"; a="293519434" X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="293519434" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2022 18:40:46 -0700 X-IronPort-AV: E=Sophos;i="5.91,203,1647327600"; d="scan'208";a="537645039" Received: from agluck-desk3.sc.intel.com ([172.25.222.78]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2022 18:40:46 -0700 From: Tony Luck To: hdegoede@redhat.com, markgross@kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, corbet@lwn.net, gregkh@linuxfoundation.org, andriy.shevchenko@linux.intel.com, jithu.joseph@intel.com, ashok.raj@intel.com, tony.luck@intel.com, rostedt@goodmis.org, dan.j.williams@intel.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, platform-driver-x86@vger.kernel.org, patches@lists.linux.dev, ravi.v.shankar@intel.com Subject: [PATCH v6 06/11] platform/x86/intel/ifs: Check IFS Image sanity Date: Thu, 5 May 2022 18:40:30 -0700 Message-Id: <20220506014035.1173578-7-tony.luck@intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220506014035.1173578-1-tony.luck@intel.com> References: <20220428153849.295779-1-tony.luck@intel.com> <20220506014035.1173578-1-tony.luck@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jithu Joseph IFS image is designed specifically for a given family, model and stepping of the processor. Like Intel microcode header, the IFS image has the Processor Signature, Checksum and Processor Flags that must be matched with the information returned by the CPUID. Reviewed-by: Dan Williams Signed-off-by: Jithu Joseph Co-developed-by: Tony Luck Signed-off-by: Tony Luck Acked-by: Hans de Goede Reviewed-off-by: Greg Kroah-Hartman --- drivers/platform/x86/intel/ifs/load.c | 66 +++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c index 9fb71d38c819..cfbf62494c89 100644 --- a/drivers/platform/x86/intel/ifs/load.c +++ b/drivers/platform/x86/intel/ifs/load.c @@ -2,9 +2,72 @@ /* Copyright(c) 2022 Intel Corporation. */ #include +#include +#include #include "ifs.h" +static int ifs_sanity_check(struct device *dev, + const struct microcode_header_intel *mc_header) +{ + unsigned long total_size, data_size; + u32 sum, *mc; + + total_size = get_totalsize(mc_header); + data_size = get_datasize(mc_header); + + if ((data_size + MC_HEADER_SIZE > total_size) || (total_size % sizeof(u32))) { + dev_err(dev, "bad ifs data file size.\n"); + return -EINVAL; + } + + if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { + dev_err(dev, "invalid/unknown ifs update format.\n"); + return -EINVAL; + } + + mc = (u32 *)mc_header; + sum = 0; + for (int i = 0; i < total_size / sizeof(u32); i++) + sum += mc[i]; + + if (sum) { + dev_err(dev, "bad ifs data checksum, aborting.\n"); + return -EINVAL; + } + + return 0; +} + +static bool find_ifs_matching_signature(struct device *dev, struct ucode_cpu_info *uci, + const struct microcode_header_intel *shdr) +{ + unsigned int mc_size; + + mc_size = get_totalsize(shdr); + + if (!mc_size || ifs_sanity_check(dev, shdr) < 0) { + dev_err(dev, "ifs sanity check failure\n"); + return false; + } + + if (!intel_cpu_signatures_match(uci->cpu_sig.sig, uci->cpu_sig.pf, shdr->sig, shdr->pf)) { + dev_err(dev, "ifs signature, pf not matching\n"); + return false; + } + + return true; +} + +static bool ifs_image_sanity_check(struct device *dev, const struct microcode_header_intel *data) +{ + struct ucode_cpu_info uci; + + intel_cpu_collect_info(&uci); + + return find_ifs_matching_signature(dev, &uci, data); +} + /* * Load ifs image. Before loading ifs module, the ifs image must be located * in /lib/firmware/intel/ifs and named as {family/model/stepping}.{testname}. @@ -24,5 +87,8 @@ void ifs_load_firmware(struct device *dev) return; } + if (!ifs_image_sanity_check(dev, (struct microcode_header_intel *)fw->data)) + dev_err(dev, "ifs header sanity check failed\n"); + release_firmware(fw); } -- 2.35.1