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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 7CD4DC56203 for ; Tue, 13 Oct 2020 02:42:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48FB3221FC for ; Tue, 13 Oct 2020 02:42:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="kWr9Y/fq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727810AbgJMAev (ORCPT ); Mon, 12 Oct 2020 20:34:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727632AbgJMAdL (ORCPT ); Mon, 12 Oct 2020 20:33:11 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A160C0613AD for ; Mon, 12 Oct 2020 17:32:51 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id p29so11718781qve.17 for ; Mon, 12 Oct 2020 17:32:51 -0700 (PDT) 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=IWlwO4V8zfIKj2VoQVJSOpIzEd6XIOwNzizfhzYsm+I=; b=kWr9Y/fqtR1gjXlZbCdcFUO5y9KCbBO6doGSE6eV/R4SdmCC/fG0VIYwLLj+OKBwVo t88hxunzWeAhsqD6nX4pMH3NXEN3LQTEHYiul8l16k+sa2iBaYnnGR+mH9hNA4iikAmL fqVb25yRhuLsNSg7v5YJjN/fVyXPqCbeWKnvoXYnl9WCtRWuKoabyI01wNyG9w6/b7UM 4pHEaQubfMyOEQT05Qht8Nh3XzDQC3RyvotMkxtCaBQJVlkntTJDfU68nv0YNejU3LJ8 DLC87sAOS1Egq4SGIijIlfkUP3DDU2E/gTaUdoloBdFbRBoomS8YvmW0JUlEF9bGUTbb DK5w== 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=IWlwO4V8zfIKj2VoQVJSOpIzEd6XIOwNzizfhzYsm+I=; b=daBHNgd/K/TBdy2Vt87eO8ww9QEtB3ux/86WE8AUPLFuIHRyxEPRG88rlsQZDdClfa h52v+Ck2RhjpvmKz4ouAoDSG52BmWeLm7OtirJLhtAdwAw2l5iEFUqAIxskc5HDfLaYl rPh7Ao+G5b0cmMjMySO0wOqEP/fJfolKlAnmfV+q5gGOwOZXecgrnBckjGYZfT3d2gxJ 4oUhVRxp13F8aKp9yknZRWKSMbcJ/WdavL9H4XvD+A/f2hTuOBV28CeDTEs8Y02HKVEe e/9zVBjJKhbwUd0j6/VXPzZShFYihYMiZPraiDCtS51KwKszPT/5IE+8Y7mm5mclBfDt HQZA== X-Gm-Message-State: AOAM533fYk9hiNqpilDEv6RBTzcGUmTBTGOSG07tAdmb3Oja05fL+EUO 8p1Vgw+hkiEZG5segl6/XqnC/areJBmb8Ugg2cI= X-Google-Smtp-Source: ABdhPJxmlU/A1sroaipRnUbPqUCXYyj5EeYMFDk9TnoZTSUFb4GItjuig8hO655sUorVd0VW8HG+pUfRKD2TGlP3Uv4= 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:ad4:4f46:: with SMTP id eu6mr28230471qvb.9.1602549170292; Mon, 12 Oct 2020 17:32:50 -0700 (PDT) Date: Mon, 12 Oct 2020 17:31:58 -0700 In-Reply-To: <20201013003203.4168817-1-samitolvanen@google.com> Message-Id: <20201013003203.4168817-21-samitolvanen@google.com> Mime-Version: 1.0 References: <20201013003203.4168817-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v6 20/25] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt Cc: Will Deacon , Peter Zijlstra , 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 Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With CONFIG_LTO_CLANG, we produce LLVM bitcode instead of ELF object files. Since LTO is not really needed here and the Makefile assumes we produce an object file, disable LTO for libstub. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- drivers/firmware/efi/libstub/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 0c911e391d75..e927876f3a05 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -36,6 +36,8 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \ # remove SCS flags from all objects in this directory KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) +# disable LTO +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS)) GCOV_PROFILE := n # Sanitizer runtimes are unavailable and cannot be linked here. -- 2.28.0.1011.ga647a8990f-goog