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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 141sm4425163pfb.50.2020.09.03.15.43.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2020 15:43:18 -0700 (PDT) Date: Thu, 3 Sep 2020 15:43:18 -0700 From: Kees Cook To: Sami Tolvanen Cc: Masahiro Yamada , Will Deacon , Peter Zijlstra , Steven Rostedt , Greg Kroah-Hartman , "Paul E. McKenney" , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v2 19/28] scripts/mod: disable LTO for empty.c Message-ID: <202009031543.A239909B@keescook> References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> <20200903203053.3411268-20-samitolvanen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200903203053.3411268-20-samitolvanen@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 03, 2020 at 01:30:44PM -0700, Sami Tolvanen wrote: > With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object > files. As empty.o is used for probing target properties, disable LTO > for it to produce an object file instead. > > Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook -- Kees Cook 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=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 6DE02C433E2 for ; Thu, 3 Sep 2020 22:44:34 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2FF6120786 for ; Thu, 3 Sep 2020 22:44:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="SprpmVyU"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Gv/ffUiV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2FF6120786 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qBU2e/jA9SxiK3JWg1nPfp/yi3UMfBLHfqZ/pNJQx0w=; b=SprpmVyUEAFuYX2kgYOufhrR2 fLhxI2yCyfg5yUnTiULAoFIGzAa8uVoNj/dcPcsQssssiSzOGdoeiGdLApPhYtQ7goi5vd3DbRxR2 XCcA1QgEhnU3pZuFOdwbH77pmPcPxuLm/+9WDT9zz4emh0XQ6pSA6HHmn/kJ+1MYMak6Ew+50Hfq4 BdzBth9cm79aShl5K7p0QCENeY7CPy2QXlI5/MD/WX9PcIrpZhlbRvw6J/qi7QF9ZBnDH2B2bs9sY csv3ikFhh78ywLDpza6lneZM8LPqvBY7k5J52n+KExLAUNeVm6gxzHgqzPt8JXaEusk/cO08mnDm9 3vAuGW9FQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kDxwy-0002VJ-Vm; Thu, 03 Sep 2020 22:43:25 +0000 Received: from mail-pg1-x542.google.com ([2607:f8b0:4864:20::542]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kDxwv-0002T6-H9 for linux-arm-kernel@lists.infradead.org; Thu, 03 Sep 2020 22:43:22 +0000 Received: by mail-pg1-x542.google.com with SMTP id l191so3270966pgd.5 for ; Thu, 03 Sep 2020 15:43:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=JQ91+76gyHMY3xv40LcJfL22rVwnSHEWIrs+JY61Lfw=; b=Gv/ffUiV4cHAcDklljNvHcMHuBcglanuZNKtn6NOLTMdAobfJFLi4S3XUK/VF0cMoa YCSlZMjLzO+hSp1mb2H+OVfbR2yXR8wtEPXnlt5uMI360+iCnjR0H3cIuzPcnksebXGK d93lpCoPbskfIrQ+gg8nraNFnKZGq6Pjaz6ts= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=JQ91+76gyHMY3xv40LcJfL22rVwnSHEWIrs+JY61Lfw=; b=Pvm8w1KQvIbE05ntX5GfjddA+gBikhEo1oIf6grQMilaJTdQKp7EIKk6QnOBNQXfns b9cSxdTK5P4rhUB39L/g6DRQfCupKbmCPwvuws5KQnJHqetYV5j4h1tJbfxWd4yF9XGg lBu+0dq/we8Nm3iBNVG9KwDtWoExaie7PbtaPbzIn4sWuHiZJOmcgyWwoZqvCaQU26/c 6j/iPyIfd12YYVOvzDwKbHKKS8xDuhzqYs8Gua7ICMBwAScnBqG6oRjeXk6a5O15tizw wu4Zeya1ZbTlw7Hn/vt3Ww8iNpkmcWOURaghYYhP/zsgaCoQ7DM2TXSGFqzrNVLDdgb7 CcUg== X-Gm-Message-State: AOAM532cNICOQZ0XCVwZzx0HLMhNk72Ntit1asFCoBt7uomroq6jD9qz DkTJmSiXx9y9EuXHWCLU1q2UTg== X-Google-Smtp-Source: ABdhPJzsDxL6JJKJu36vJnlttgHabnBSHn20nTl7ZGP5hdybfETsgZLi8FgY6Utuj7Ord6vXDPO70Q== X-Received: by 2002:a62:4e49:: with SMTP id c70mr5965062pfb.100.1599172999617; Thu, 03 Sep 2020 15:43:19 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id 141sm4425163pfb.50.2020.09.03.15.43.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2020 15:43:18 -0700 (PDT) Date: Thu, 3 Sep 2020 15:43:18 -0700 From: Kees Cook To: Sami Tolvanen Subject: Re: [PATCH v2 19/28] scripts/mod: disable LTO for empty.c Message-ID: <202009031543.A239909B@keescook> References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> <20200903203053.3411268-20-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200903203053.3411268-20-samitolvanen@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200903_184321_635001_C32D46E7 X-CRM114-Status: GOOD ( 12.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , Masahiro Yamada , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, Steven Rostedt , clang-built-linux@googlegroups.com, linux-pci@vger.kernel.org, Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 03, 2020 at 01:30:44PM -0700, Sami Tolvanen wrote: > With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object > files. As empty.o is used for probing target properties, disable LTO > for it to produce an object file instead. > > Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook -- Kees Cook _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel