From patchwork Wed Nov 18 22:07:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11918729 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 DDDFDC63798 for ; Wed, 18 Nov 2020 22:08:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 873492054F for ; Wed, 18 Nov 2020 22:08:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sYNH5IyS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727471AbgKRWID (ORCPT ); Wed, 18 Nov 2020 17:08:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727473AbgKRWIC (ORCPT ); Wed, 18 Nov 2020 17:08:02 -0500 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AB33C061A48 for ; Wed, 18 Nov 2020 14:08:01 -0800 (PST) Received: by mail-qt1-x849.google.com with SMTP id n12so2655959qta.9 for ; Wed, 18 Nov 2020 14:08:01 -0800 (PST) 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=4XuhSBro4JmbEzc1ahwEF0ocfPBDRGYBwGKNTvA6UGE=; b=sYNH5IySg/OAzl6C1030j5KrdvL/TknJ66ncYZZ0VJfRnkJWabJqF72HyVEtrFqsuV xHZDm78BMKoevfVrShC34UAWPm7inA3f5NPp/T5mwxJWNUaUEmUhisnupmkn6fu/2Gwc kjHvUXUV8ClEbbYTv/sJSHv6xAYf/ZgciW+HWWd1Obttcn34VOfLfUiaEuwE1mBQcIyI J7VEKckt5CvBwsRjuSRuQDHCbWNKrS0m4sNytF7pqSs/Xbr+4gRn0wdtIjpFJpzvj09z m7KNcyrQeKkKkgoq4NE1+LYU1VECryxaLniuQ5P+UABuyCF4PafQeFexbMmZ21dv9FUI l/PQ== 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=4XuhSBro4JmbEzc1ahwEF0ocfPBDRGYBwGKNTvA6UGE=; b=m4biCmIfDe1+yt9kYGe+mzw29/+LzXpJjJrmxVijlKNmK4mDW07s79DF4uIO79N4rZ zwC6xGi8K6Twdv3TZG+9CG/WcwPQ8KOFDttpUO56HeVWf1Il+/kDaxtk2IDarulnwcLO 68wfBBdWzR7MtPH2L/f0KjN7Ww1kwGhDBNghadYOGPjbFDupelgcNkY3Idqs5S3ynWpz NBi39Z93OSMUnCNwITWBPNF9w6O6x7GsLadWhQJu5riyc15V4xqZOrwlyouqrpRuyZoy fyaVSjTQSsxh26mRTDO0g8cqprjEElF+IV51C3Uu/MJ90NfDTrMUZoMgVC5fvFsA9nfg ZVEA== X-Gm-Message-State: AOAM532BzyR2+F43S53wDj3xWkAApDIuQVTI8SvIbwgw6kC6h6sotcff POsCSuTdlJEfyCu8jw4KkLLibu/pEHcgd77TMY4= X-Google-Smtp-Source: ABdhPJz+m+xG4KrpgdWsllrU16+uPERUb2CyF3GRyM+22sZfjEXDruR1i7vglehue0hFGlNRVCYfCWncFBgvChpJLaQ= 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:a0c:e790:: with SMTP id x16mr7088555qvn.21.1605737280219; Wed, 18 Nov 2020 14:08:00 -0800 (PST) Date: Wed, 18 Nov 2020 14:07:26 -0800 In-Reply-To: <20201118220731.925424-1-samitolvanen@google.com> Message-Id: <20201118220731.925424-13-samitolvanen@google.com> Mime-Version: 1.0 References: <20201118220731.925424-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v7 12/17] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , 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, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: linux-pci@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 8a94388e38b3..c23466e05e60 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -38,6 +38,8 @@ 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.