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=-8.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 0AEA5C433E1 for ; Tue, 25 Aug 2020 00:34:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B98772074D for ; Tue, 25 Aug 2020 00:34:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="mggVYqUI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B98772074D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5D9C190001B; Mon, 24 Aug 2020 20:34:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 58937900010; Mon, 24 Aug 2020 20:34:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4780590001B; Mon, 24 Aug 2020 20:34:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0115.hostedemail.com [216.40.44.115]) by kanga.kvack.org (Postfix) with ESMTP id 306F6900010 for ; Mon, 24 Aug 2020 20:34:01 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id F3A9D8248047 for ; Tue, 25 Aug 2020 00:34:00 +0000 (UTC) X-FDA: 77187218682.04.match46_0b14c4827057 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin04.hostedemail.com (Postfix) with ESMTP id CE987800B4FA for ; Tue, 25 Aug 2020 00:34:00 +0000 (UTC) X-HE-Tag: match46_0b14c4827057 X-Filterd-Recvd-Size: 3805 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Tue, 25 Aug 2020 00:34:00 +0000 (UTC) Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 52A2F22BEA for ; Tue, 25 Aug 2020 00:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598315639; bh=FZVk5iiXJbmA3My8loC+sCM7p8RHhlYbxo2KYPIse/o=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=mggVYqUIgHbDQKb/yVaAMmhrthhgWbYYBwu714YhVe9OQ2/ALMq/Cy86XMLrV9SX/ uHsQgq2f4G38hwoV06S/mM/5jXTexbRiA/MbDFdzed59wrq9ZCjjKcezLf2jFRFip5 yOW67xQag00gSYB+iKbRbVfU9CrDRiNoY6/71ri0= Received: by mail-wm1-f44.google.com with SMTP id x9so597793wmi.2 for ; Mon, 24 Aug 2020 17:33:59 -0700 (PDT) X-Gm-Message-State: AOAM53178GYiVqUIAR03MbtlpaOm0179uzrK4Zi4vXENi+8n2ZEqbrrS mNHZO2mQkF9CYYiX+e3pUvgug4dwSVaW/BIWlnEJ1w== X-Google-Smtp-Source: ABdhPJxs5innMByMfHrDOfrJMbYWcoGG4lrxdYWHbQ0NbBl3UqboIJUvK4aNgCRUoVaifdvLV7DHlZhHzHiKtSmebvY= X-Received: by 2002:a1c:ba08:: with SMTP id k8mr1702940wmf.49.1598315637952; Mon, 24 Aug 2020 17:33:57 -0700 (PDT) MIME-Version: 1.0 References: <20200825002645.3658-1-yu-cheng.yu@intel.com> <20200825002645.3658-9-yu-cheng.yu@intel.com> In-Reply-To: <20200825002645.3658-9-yu-cheng.yu@intel.com> From: Andy Lutomirski Date: Mon, 24 Aug 2020 17:33:46 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v11 8/9] x86/vdso: Insert endbr32/endbr64 to vDSO To: Yu-cheng Yu Cc: X86 ML , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , LKML , "open list:DOCUMENTATION" , Linux-MM , linux-arch , Linux API , Arnd Bergmann , Andy Lutomirski , 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 Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: CE987800B4FA X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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 Mon, Aug 24, 2020 at 5:30 PM 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. > > Signed-off-by: H.J. Lu > Signed-off-by: Yu-cheng Yu > Acked-by: Andy Lutomirski I revoke my Ack. Please don't repeat the list of object files. Maybe add the option to CFL? --Andy