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=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 0BB63C54FCB for ; Mon, 27 Apr 2020 16:49:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC6122084D for ; Mon, 27 Apr 2020 16:49:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GRK7TdGO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726435AbgD0QtE (ORCPT ); Mon, 27 Apr 2020 12:49:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726250AbgD0QtC (ORCPT ); Mon, 27 Apr 2020 12:49:02 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 641AAC03C1A7 for ; Mon, 27 Apr 2020 09:49:02 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id w20so18370061ljj.0 for ; Mon, 27 Apr 2020 09:49:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=DggTYojfEhSzNZzSt4p++E5JdlZHCZXJc0ROh9SzVlM=; b=GRK7TdGOAvGylag4wlIODdJrhvjeHh+CNCtIcuSjrjRzmjvA/4gHODiRDIqS3Ni+Ul xbrVAAQCFm0TrYX2gS2hmjsvmryyRHakKtro88oW5d8as36di5wAZi4QB0mVNrt3VYKC +mpM0biKQt1OtPZuP6KA+c31n0Icc3RDkS0F9D8RbdChUBCSxHizssgw5UMLXNS+Ozdv GhMLcbyKMjipz7hWcnUogsA5mxtEQ9HhUWk5UBJ4M7FpLiEWL82tfvSHuemxUMjA3T9k HQEcjwjSO8dW822QXi8v5ESAjxm5SgtUzR6RIF8ybNX7oWNscelNzVp5wj+yo9QkGQtH XR7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=DggTYojfEhSzNZzSt4p++E5JdlZHCZXJc0ROh9SzVlM=; b=mhfP6UgX2dZJxDip/ysNKepqvEFCvQi4be9sbCgvLiKmNyrQ7sP7fZUTuAPuWQ0YVR Y1jM97JATPRnhu/Q2zg+Fv+B7k5LIDw0uADk8zAanF/NBr2aSCx2fvaRFe3FWag5ZNUR rTxcXD6QosnYGvq/AbOCPqM5zZTo37Is0dzhgM92uQsWlmesEaGb5muRoNKdp4uSgJ4V eVgPxN9puQ4u9k+GGCqepKLlX+TV7TLQoHrw0MjJPgVe6NLk1ynbIqy1oXgm7/dfVYms 4IZl76LT5YJK5DjXitEsLjLPjm3BqRuisJkeHtIaKgRc7Xxou+58LmbEaGNpROxJ2/NP TPCg== X-Gm-Message-State: AGi0PuYSO8ROELuZJ80+9xP4Vjppqgk816dp/F5RkiGiDwuVImQOGWGa 4x0r03TaNJp8mjRmPt2ji+v0DJRdV2asEChoY+k= X-Google-Smtp-Source: APiQypKOZlel+ggVdbFyIPtgHGZpVrDz6ne1COTeLPmgW0WeAhG5IdM5qWoDEvfl/ilzflIttY+StL0Az1RFGIsqSuw= X-Received: by 2002:a2e:7613:: with SMTP id r19mr4909107ljc.29.1588006140845; Mon, 27 Apr 2020 09:49:00 -0700 (PDT) MIME-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20200427160018.243569-1-samitolvanen@google.com> <20200427160018.243569-2-samitolvanen@google.com> In-Reply-To: <20200427160018.243569-2-samitolvanen@google.com> From: Miguel Ojeda Date: Mon, 27 Apr 2020 18:48:49 +0200 Message-ID: Subject: Re: [PATCH v13 01/12] add support for Clang's Shadow Call Stack (SCS) To: Sami Tolvanen Cc: Will Deacon , Catalin Marinas , James Morse , Steven Rostedt , Ard Biesheuvel , Mark Rutland , Masahiro Yamada , Michal Marek , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dave Martin , Kees Cook , Laura Abbott , Marc Zyngier , Masami Hiramatsu , Nick Desaulniers , Jann Horn , clang-built-linux , Kernel Hardening , Linux ARM , linux-kernel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 27, 2020 at 6:00 PM Sami Tolvanen wrote: > > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h > index 333a6695a918..18fc4d29ef27 100644 > --- a/include/linux/compiler-clang.h > +++ b/include/linux/compiler-clang.h > @@ -42,3 +42,9 @@ > * compilers, like ICC. > */ > #define barrier() __asm__ __volatile__("" : : : "memory") > + > +#if __has_feature(shadow_call_stack) > +# define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) > +#else > +# define __noscs > +#endif Can we remove the `#else` branch? compiler_types.h [*] has to care anyway about that case for other compilers anyway, no? > diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h > index e970f97a7fcb..97b62f47a80d 100644 > --- a/include/linux/compiler_types.h > +++ b/include/linux/compiler_types.h > @@ -193,6 +193,10 @@ struct ftrace_likely_data { > # define randomized_struct_fields_end > #endif > > +#ifndef __noscs > +# define __noscs > +#endif [*] Here Cheers, Miguel