From patchwork Thu Sep 3 20:30:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11754833 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 977C913B1 for ; Thu, 3 Sep 2020 20:34:56 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id EFFCD20658 for ; Thu, 3 Sep 2020 20:34:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jsA0R90V" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EFFCD20658 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-19738-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 24388 invoked by uid 550); 3 Sep 2020 20:31:47 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 24294 invoked from network); 3 Sep 2020 20:31:46 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=1wwsKOGiECV1D1KgEHVbv0B/BweA4F/I9dw72JmCR3Y=; b=jsA0R90VNx0CoNdYrwoyOulsyiH5eOY2B2rBuxLOroD3N8gF6y68Uc74RwL8AKswR5 n5/cBj7T/lyKXDy+P6JEI3be0GGmxiSkgHJmFktuKctZm2r28JRNmXt3g4bRrATpRRJj AKOpxNPAVu2AFG1rMtyHbfAjRlhyxI5DXqho5Y5dgitaesdKWb1R2Xlfv4eCDShyWxYd M2olQjWDVjBt6grqHSaDbsq6b9joIjXKtUCXnqfaiFE3kVTOyDzHYaowglyC6rRbuC8n ZMsNaxWGpDQCuE51B+THxTbQeMBeUvq6W0Zdbe2AYAQZkL71Lk4+kzlFUo83wtb7N8s5 fiJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=1wwsKOGiECV1D1KgEHVbv0B/BweA4F/I9dw72JmCR3Y=; b=YuuWkgM8cekxH+mfJrEt6FmeZ/PbTi3pXc++PMozXDWh/XgVEQWu7i7BGVv4XEKaj7 vx1a9tnpP4N06eEkTgQPDg2f7LSWll/zNOmogjnhjsjLwHJWm3V6ILIO7zzd4+BPi67/ Q+annKl9qaA3QJ6ni7KsJR2Wz/90AIjzNJ9fSIOyO75+CVUPlgGXYHfpJWxrEzseO2nI avlfQ89Fj5pinAENx2925mcrh4wJvHBnWf6hWe+/H9113ezftVW96ISh7jFoGTlQ+qfK gZLlhcIL4QNOfz1J3YRGdIFk8l+ExVfmcReqWbipp4xlmNdlSjOH1uQjcRy6kAtyXyZG hw0Q== X-Gm-Message-State: AOAM533NXI+ZYyrrjhwi90oTIOpQmSeZ/TDkh+endVaIKvrcrWqHV8tn IfIvNLHSJLWOxRnGglEWaPXMu70VuGtrVo/uaGE= X-Google-Smtp-Source: ABdhPJwEKrxzd5NrBrajDh1vcsnhdiTwGRM7+BFQV4hZChNnFjkX2yaVuQmX8BQu56ntgdFiR9mN2xnv8SJVdSGGSeE= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a17:90b:384c:: with SMTP id nl12mr4502047pjb.205.1599165094662; Thu, 03 Sep 2020 13:31:34 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:44 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-20-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH v2 19/28] scripts/mod: disable LTO for empty.c From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , 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, Sami Tolvanen 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 --- scripts/mod/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile index 78071681d924..c9e38ad937fd 100644 --- a/scripts/mod/Makefile +++ b/scripts/mod/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 OBJECT_FILES_NON_STANDARD := y +CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO) hostprogs-always-y += modpost mk_elfconfig always-y += empty.o