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 89E8CC4727E for ; Fri, 25 Sep 2020 16:30:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 475B122B2D for ; Fri, 25 Sep 2020 16:30:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728069AbgIYQaG (ORCPT ); Fri, 25 Sep 2020 12:30:06 -0400 Received: from mga17.intel.com ([192.55.52.151]:63060 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726990AbgIYQaG (ORCPT ); Fri, 25 Sep 2020 12:30:06 -0400 IronPort-SDR: 9UctMn/qR+OAiVHYpuiLo9eMOQO76MGajNKL8gFqQPrxLzkXNHPxQs85gc02sq8nQu1cRP05Mw 6fMH53X314Bg== X-IronPort-AV: E=McAfee;i="6000,8403,9755"; a="141595760" X-IronPort-AV: E=Sophos;i="5.77,302,1596524400"; d="scan'208";a="141595760" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga107.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 Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org 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