From patchwork Thu Sep 3 20:30:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11754849 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 8C1C213B1 for ; Thu, 3 Sep 2020 20:35:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73DF220897 for ; Thu, 3 Sep 2020 20:35:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="npSffdai" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729520AbgICUfG (ORCPT ); Thu, 3 Sep 2020 16:35:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729107AbgICUct (ORCPT ); Thu, 3 Sep 2020 16:32:49 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79D7EC0619F0 for ; Thu, 3 Sep 2020 13:31:37 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id p138so4011073yba.12 for ; Thu, 03 Sep 2020 13:31:37 -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=iN3GbBjTX25viV6xW68a9oo3MkQJYWkKKPfs1TkAluY=; b=npSffdaieWFucXHDLr4mY6XgP2tHJEoOTVV6csT96vPOxvouZbo+xOm04baMS0+EN+ ILt6v3wDsnQiQY1Dfffcie0xZpTFWaLYK6BzUM04xdyHxieJIvNOg6LNdFOj/3y0mBnH Jte3FAnXYcPxQddxr87OOvJEZ6dUuX9sLqI5aXpeyk3Ki59e1OAR1zKEEXG4Ifc9lR1Z LmZi20QOngtk5w17q0wIZkw3ahIXVLzoXpdRB96sntn1liwbbCydI+aZqLJTRszyPkgg aLXX8AB5Ds1j4EtaGcnjmp8w24YNv7D+M1DcDJJ9VXF0l9BS/QNTX03Rsdsi7XuPq2av wZUQ== 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=iN3GbBjTX25viV6xW68a9oo3MkQJYWkKKPfs1TkAluY=; b=NDmkj+7W10WqP2vmP8G5yB+ro5BGWevvZs9HEi9FANN/tTnCn2Hgol1noR8VgpAtUb vH4JWPVODK0mS86RuQ3HaDB6R+gVEDzPX4j706svuhM4zJDYKAsTuvjhU/aYYpbZl7AZ Zkb503BdVjauHVxOGqeuLdmiCx6oKtCrPqypVlL3chVE4IB/RDc0hZczqVqfl6QKMjBF gHKjs6C2x76XkbXqJPTP/iouiKXZ6NG4Oe0ghegfClAC02a2r4hrenY/mkHY8sjzQhLe SoWQE5LIyq835q5gommpoz57SIv2kp04zKEMDTlb39W3wW+tEoGStw/J6r09Ms03qg7s fTew== X-Gm-Message-State: AOAM531moARl9Ign+ic1KfPdM4nu/gX94kWYS9nBR7YTOM+tmJ5SzmdU Eq0DiWVkB4IZpjv7hFfc5rM/0lAMK9fRDD9uYdM= X-Google-Smtp-Source: ABdhPJyiG0zEVlMgXVpb6Zi8eshehY9Qj0OKZzrDehRr0ot1IUkMHErjz4cB8zqJtzXVoh7q4DtUcBhjwy1qLdSHusA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:1455:: with SMTP id 82mr5771395ybu.274.1599165096721; Thu, 03 Sep 2020 13:31:36 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:45 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-21-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 20/28] efi/libstub: disable LTO 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 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@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 296b18fbd7a2..0ea5aa52c7fa 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -35,6 +35,8 @@ 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.