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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 0C9E0C4727D for ; Fri, 25 Sep 2020 16:18:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C24B423977 for ; Fri, 25 Sep 2020 16:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601050735; bh=GUc4jpnEvctVnzgDAzmULezA1tRJBanFMPyHYi3PskM=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=sf044Mx4Sh7lV7DrHqypYmS1zEu4JOKQojfQ5vS3/R2nsyhF4jRhmJRsiVNoO418b HdCnT5vYgQZUztrFbMW9+Yf6FbjfrUHmiRgMOtQaUeHyDt8n018MvD9t3O5i1Jcvtf ycQsMoTkumYvZQBGJpFCkcAnIQUCZCZN77iqvU3o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729455AbgIYQSz (ORCPT ); Fri, 25 Sep 2020 12:18:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:49124 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729353AbgIYQSz (ORCPT ); Fri, 25 Sep 2020 12:18:55 -0400 Received: from mail-wr1-f53.google.com (mail-wr1-f53.google.com [209.85.221.53]) (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 4935A2371F for ; Fri, 25 Sep 2020 16:18:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601050734; bh=GUc4jpnEvctVnzgDAzmULezA1tRJBanFMPyHYi3PskM=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=cET+LyFrgZBvlCFjcW/UfnU9JVLddwQbaqcsDW7+dYYfjiX3C89dpiH44QVfwhyiM W+slZaP8r08NiHpX29xBrXll+lgSJ8OE1mRjirUFy0R4pepwnRjSknAHzI1blzfSph 2eH0Fx8m9sMCrg+RjSHd3gWrDQsuwnIiJD2aY4QM= Received: by mail-wr1-f53.google.com with SMTP id w5so4194664wrp.8 for ; Fri, 25 Sep 2020 09:18:54 -0700 (PDT) X-Gm-Message-State: AOAM531PkuO4pzXFgRS+ipC2eaTdKfNYy/pbnsZC51Nz4ZFJuANnzasX ElVhdabPk2d7DN0J3fk1m9815REazVu4GV90ah5z1A== X-Google-Smtp-Source: ABdhPJzJVQ4SroX19lHOoDdodedOBW7zt9uLDHTfG6pZa6tPMOiFKYUvMXunh9BhjogLm/n0RMCIDmE5ewnQIks5cFk= X-Received: by 2002:adf:ce8e:: with SMTP id r14mr5289436wrn.257.1601050732711; Fri, 25 Sep 2020 09:18:52 -0700 (PDT) MIME-Version: 1.0 References: <20200925145804.5821-1-yu-cheng.yu@intel.com> <20200925145804.5821-8-yu-cheng.yu@intel.com> In-Reply-To: <20200925145804.5821-8-yu-cheng.yu@intel.com> From: Andy Lutomirski Date: Fri, 25 Sep 2020 09:18:40 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v13 7/8] 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 , Pengfei Xu Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org 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