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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 8D53AC4363D for ; Fri, 25 Sep 2020 16:24:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2CEDC2311D for ; Fri, 25 Sep 2020 16:24:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2CEDC2311D 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 78B996B0081; Fri, 25 Sep 2020 12:24:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 73CDD6B0082; Fri, 25 Sep 2020 12:24:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 652526B0085; Fri, 25 Sep 2020 12:24:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0078.hostedemail.com [216.40.44.78]) by kanga.kvack.org (Postfix) with ESMTP id 4F9C26B0081 for ; Fri, 25 Sep 2020 12:24:08 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 13254584D for ; Fri, 25 Sep 2020 16:24:08 +0000 (UTC) X-FDA: 77302105776.21.verse30_5401fdb27169 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin21.hostedemail.com (Postfix) with ESMTP id CB121180442C0 for ; Fri, 25 Sep 2020 16:24:07 +0000 (UTC) X-HE-Tag: verse30_5401fdb27169 X-Filterd-Recvd-Size: 3489 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by imf04.hostedemail.com (Postfix) with ESMTP for ; Fri, 25 Sep 2020 16:24:06 +0000 (UTC) IronPort-SDR: sgEUgcTUwk25EjonvLGfcLuBYw4anWPAZ3HnnN4C2rGpohi6fqiYb5Tl1HqI0EmdwYYh5BmhdS LFbKLlyYa9Cw== X-IronPort-AV: E=McAfee;i="6000,8403,9755"; a="140993139" X-IronPort-AV: E=Sophos;i="5.77,302,1596524400"; d="scan'208";a="140993139" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 09:24:04 -0700 IronPort-SDR: vHdifD14J84gl8JjAmKSDE2KtjS/2Giltym9R13pNYrr/NHuWS2H57QxhxDK7TQVW7t78AKulw y+D7DjrH2MJw== X-IronPort-AV: E=Sophos;i="5.77,302,1596524400"; d="scan'208";a="455901501" Received: from yyu32-mobl1.amr.corp.intel.com (HELO [10.213.161.229]) ([10.213.161.229]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 09:24:02 -0700 Subject: Re: [PATCH v13 7/8] x86/vdso: Insert endbr32/endbr64 to vDSO To: Andy Lutomirski Cc: X86 ML , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , LKML , "open list:DOCUMENTATION" , Linux-MM , linux-arch , Linux API , Arnd Bergmann , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu References: <20200925145804.5821-1-yu-cheng.yu@intel.com> <20200925145804.5821-8-yu-cheng.yu@intel.com> From: "Yu, Yu-cheng" Message-ID: <9473b1ef-2e05-4faa-1eb7-b0e22560b267@intel.com> Date: Fri, 25 Sep 2020 09:24:02 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: 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 9/25/2020 9:18 AM, Andy Lutomirski wrote: > On Fri, Sep 25, 2020 at 7:58 AM Yu-cheng Yu wrote: >> >> From: "H.J. Lu" >> >> When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be >> called indirectly, and must have ENDBR32 or ENDBR64 as the first >> instruction. The compiler must support -fcf-protection=branch so that it >> can be used to compile vDSO. > > Acked-by: Andy Lutomirski > Thanks! Yu-cheng