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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 1F42EC64E8A for ; Mon, 30 Nov 2020 19:06:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 79A0B2076E for ; Mon, 30 Nov 2020 19:06:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 79A0B2076E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B76566B0036; Mon, 30 Nov 2020 14:06:12 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B25926B005C; Mon, 30 Nov 2020 14:06:12 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A13EB8D0001; Mon, 30 Nov 2020 14:06:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id 85C566B0036 for ; Mon, 30 Nov 2020 14:06:12 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 3F17718244EDE for ; Mon, 30 Nov 2020 19:06:12 +0000 (UTC) X-FDA: 77542014984.18.bite66_1e173b3273a4 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id 4A11410046DB2 for ; Mon, 30 Nov 2020 18:34:46 +0000 (UTC) X-HE-Tag: bite66_1e173b3273a4 X-Filterd-Recvd-Size: 3389 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Mon, 30 Nov 2020 18:34:44 +0000 (UTC) IronPort-SDR: f7VoYAmMhbYYTOUpj8ToI9hhy+Op+V1xK79LaEw7OIYygANhl5eA+oALaMNq9mKUNeGJgUfhZ7 uI6wyp5Hxbgg== X-IronPort-AV: E=McAfee;i="6000,8403,9821"; a="159741010" X-IronPort-AV: E=Sophos;i="5.78,382,1599548400"; d="scan'208";a="159741010" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Nov 2020 10:34:42 -0800 IronPort-SDR: 9dOX7jHwsdaXZ+0ublJbeehadYhgfNdrRIew/cg2EBrlxQ8Z8VCjMhjxmSSYjpqFnIOReAcFrd drhoHvA7exmA== X-IronPort-AV: E=Sophos;i="5.78,382,1599548400"; d="scan'208";a="345167847" Received: from yyu32-mobl1.amr.corp.intel.com (HELO [10.212.122.22]) ([10.212.122.22]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Nov 2020 10:34:39 -0800 Subject: Re: [PATCH v15 01/26] Documentation/x86: Add CET description To: Nick Desaulniers Cc: Dave.Martin@arm.com, arnd@arndb.de, bp@alien8.de, bsingharora@gmail.com, corbet@lwn.net, dave.hansen@linux.intel.com, esyr@redhat.com, fweimer@redhat.com, gorcunov@gmail.com, hjl.tools@gmail.com, hpa@zytor.com, jannh@google.com, keescook@chromium.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mike.kravetz@oracle.com, mingo@redhat.com, nadav.amit@gmail.com, oleg@redhat.com, pavel@ucw.cz, pengfei.xu@intel.com, peterz@infradead.org, ravi.v.shankar@intel.com, rdunlap@infradead.org, tglx@linutronix.de, vedvyas.shanbhogue@intel.com, weijiang.yang@intel.com, x86@kernel.org, maskray@google.com, llozano@google.com, clang-built-linux@googlegroups.com, erich.keane@intel.com References: <20201110162211.9207-2-yu-cheng.yu@intel.com> <20201130182641.29812-1-ndesaulniers@google.com> From: "Yu, Yu-cheng" Message-ID: <4fad528b-e467-f96d-b7fb-9484fd975886@intel.com> Date: Mon, 30 Nov 2020 10:34:38 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <20201130182641.29812-1-ndesaulniers@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11/30/2020 10:26 AM, Nick Desaulniers wrote: > (In response to https://lore.kernel.org/lkml/20201110162211.9207-2-yu-cheng.yu@intel.com/) > >> These need to be enabled to build a CET-enabled kernel, and Binutils v2.31 >> and GCC v8.1 or later are required to build a CET kernel. > > What about LLVM? Surely CrOS might be of interest to ship this on (we ship the > equivalent for aarch64 on Android). > I have not built with LLVM, but think it probably will work as well. I will test it. >> An application's CET capability is marked in its ELF header and can be >> verified from the following command output, in the NT_GNU_PROPERTY_TYPE_0 >> field: >> >> readelf -n | grep SHSTK >> properties: x86 feature: IBT, SHSTK > > Same for llvm-readelf. > I will add that to the document. Thanks, Yu-cheng