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=-20.9 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 D997FC47425 for ; Tue, 29 Sep 2020 21:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C2C22076D for ; Tue, 29 Sep 2020 21:47:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BzhS1T0x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729283AbgI2Vrr (ORCPT ); Tue, 29 Sep 2020 17:47:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729062AbgI2VrY (ORCPT ); Tue, 29 Sep 2020 17:47:24 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8961DC0613D4 for ; Tue, 29 Sep 2020 14:47:24 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id 125so3697892qkh.4 for ; Tue, 29 Sep 2020 14:47:24 -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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=BzhS1T0xYeEiySZIOFWUBMfKhfKV0HPZIieZxlx9n3aL+z4pvUMG5Ng4jF9unkKap/ tO9mqZLwYCHnW4SoQoRDd9xj/JuUj2YsNmmiE2W6UZ9Itp3mKe8kS3gKBADOR/nGL3He otJNs3Mijsx+Zkiokc4jCGwVgbgADg7TCEk8/IVeBXOhMnE5Hczz4ADi7wiEyV9XxDnQ CBCO0JHTOoIbLsAtW5aT9bGD3uO2HiLFrmGsIOQJmaWMfyDYVuHD5zcosXBXFN0QKfe6 OUelHGKeWMSnmfva0aiqsCtg7FoCJjy5OfR9BBUjYTviAyQA6MbK83k+CKxB+opxcmzD 8gIg== 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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=T3odHo5OdmYEziq5qZMC6tjejvYhYyBqh6HMS9Lz8TX+4LWzDUlbJAZWZOCsMy7mwt rROv7Z/QIvVw3SnaEkSdmvp4kZmox/C+Fhk0hx//xDIsFS4XuG1AMs6GcMVubO5XJ83H /4co1O6XTuxEl9Gy0hNKBrBA1Pnxk1ggaHQV5WCjvSwGZVXef4u0QwqvLss5xA/ZMnBV Gmini7VinczLaRO2/mYyDQme/ipqav9wlajstMB1fxtRvbyaF9UJH3ofo/pERHjGs2Tu aWbpVLfjIocIX369rZl2J6c1HuoswtybVQhCn2NAg9WfDPzhhz1ja5b4kEOcMZUizwpj pI3Q== X-Gm-Message-State: AOAM531t26By6mFWmS/rl6LJ33ttO7aY7UeNdr30JL9td0hjvYuVfi5U SH+2Wn1O+QH1T/J+EACPBd2pM7VmnJah/qOZqAY= X-Google-Smtp-Source: ABdhPJxBMrynxyAmEuZVv9LuIz06tIes1P0/ZQj3AQWscVUvE2zt/WDYQVICvMnTs++j9WIGBb/QMCUTkCn1lpeTKkM= 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:9a4b:: with SMTP id q11mr6580741qvd.29.1601416043698; Tue, 29 Sep 2020 14:47:23 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:24 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 22/29] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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 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. -- 2.28.0.709.gb0816b6eb0-goog 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=-13.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 CF539C4727C for ; Tue, 29 Sep 2020 21:58:14 +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 43E77206D9 for ; Tue, 29 Sep 2020 21:58:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="nFHlNMmU"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="BzhS1T0x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 43E77206D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com 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:To:From:Subject:References:Mime-Version:Message-Id: In-Reply-To:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Jig+ThCZp66aeyVLVKf/MmVV7wNbANebTcSKXZ0jUeE=; b=nFHlNMmUjA/gPlTmWuj6AZQqY pkrapsTMg265yGaRWkOlsb8tFz/Bu9fs/HsOipwEzDajkrZhM9wuxYrJ90kiFLKH2uEDw5yxQq/WT hG3lIOoTZyiZwUqSba14psN0L+uEP3dK4AiD684zjKhfWEefMI5R7MlCkQbw3jMgJWlk9aLhHBWv4 GXtqJbt41QsE+tLLqsrTgLRBtU8NerSE2pNGmNl8zosu5jV+TH/KXD/0hP8ZKkCjvvk5OvhtTDaM/ dwYTFduGuHJFwYa06VcTi8JLiERyM+fDvVADcOkC8EM8R7l2bfIQB1xZqCgC3989nXmPvMxR6X3GJ X1nSdEEJA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNNbJ-0004jp-9N; Tue, 29 Sep 2020 21:55:57 +0000 Received: from mail-qk1-x749.google.com ([2607:f8b0:4864:20::749]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNNT6-0000iy-K4 for linux-arm-kernel@lists.infradead.org; Tue, 29 Sep 2020 21:47:30 +0000 Received: by mail-qk1-x749.google.com with SMTP id 16so3666844qky.8 for ; Tue, 29 Sep 2020 14:47:25 -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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=BzhS1T0xYeEiySZIOFWUBMfKhfKV0HPZIieZxlx9n3aL+z4pvUMG5Ng4jF9unkKap/ tO9mqZLwYCHnW4SoQoRDd9xj/JuUj2YsNmmiE2W6UZ9Itp3mKe8kS3gKBADOR/nGL3He otJNs3Mijsx+Zkiokc4jCGwVgbgADg7TCEk8/IVeBXOhMnE5Hczz4ADi7wiEyV9XxDnQ CBCO0JHTOoIbLsAtW5aT9bGD3uO2HiLFrmGsIOQJmaWMfyDYVuHD5zcosXBXFN0QKfe6 OUelHGKeWMSnmfva0aiqsCtg7FoCJjy5OfR9BBUjYTviAyQA6MbK83k+CKxB+opxcmzD 8gIg== 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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=fjd3/DxGJXNTpl/qFDKDwyaH1uS1A57Q1fROgBGZzvUuR/3BXxHUf6Di9lOvPI6TNx FYommZrxbN0nCYjdgMB09gFYKiL/KJ7JYWjQIDBpL/+tNJ44qsE9YfWQqpVp/kVshI3m D9p63MW3m6JUlgIGGTFtVdZnS89eSOxQQUg7hGxSDxnJZ+L10jJiSz5n5OE2Pn2Y/ZwC 48MEZyAFVrvtrFF5+wC0dwUfeoFkx/iFWvq905ZKZh3eiL/gSDYQfS7MpjAvKcwLz067 bmNTZBIHeXRs0Ak+PwFyLAXizAbCX0VUXZ3hnFhe5W9rRP4y7i157Nonfds+i3SPyigL 3hVQ== X-Gm-Message-State: AOAM533k/4ke7FFIxGVtu0HRJ8Ab56q70r/Pb0LfU+m1j4575hseZwFP YbloIYBVYjpUwknCkUWGdPHchak6SdvaicPdkKI= X-Google-Smtp-Source: ABdhPJxBMrynxyAmEuZVv9LuIz06tIes1P0/ZQj3AQWscVUvE2zt/WDYQVICvMnTs++j9WIGBb/QMCUTkCn1lpeTKkM= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a0c:9a4b:: with SMTP id q11mr6580741qvd.29.1601416043698; Tue, 29 Sep 2020 14:47:23 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:24 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 22/29] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200929_174728_741017_71F529B0 X-CRM114-Status: GOOD ( 11.84 ) 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, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , linux-pci@vger.kernel.org, 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 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. -- 2.28.0.709.gb0816b6eb0-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-20.9 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 5DE8DC4727C for ; Tue, 29 Sep 2020 21:50:22 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 682B32076D for ; Tue, 29 Sep 2020 21:50:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BzhS1T0x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 682B32076D 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-20052-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 1655 invoked by uid 550); 29 Sep 2020 21:47:36 -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: Received: (qmail 1566 invoked from network); 29 Sep 2020 21:47:35 -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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=BzhS1T0xYeEiySZIOFWUBMfKhfKV0HPZIieZxlx9n3aL+z4pvUMG5Ng4jF9unkKap/ tO9mqZLwYCHnW4SoQoRDd9xj/JuUj2YsNmmiE2W6UZ9Itp3mKe8kS3gKBADOR/nGL3He otJNs3Mijsx+Zkiokc4jCGwVgbgADg7TCEk8/IVeBXOhMnE5Hczz4ADi7wiEyV9XxDnQ CBCO0JHTOoIbLsAtW5aT9bGD3uO2HiLFrmGsIOQJmaWMfyDYVuHD5zcosXBXFN0QKfe6 OUelHGKeWMSnmfva0aiqsCtg7FoCJjy5OfR9BBUjYTviAyQA6MbK83k+CKxB+opxcmzD 8gIg== 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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=lGDmpEyWSJQ5G1KPYrgUHXs3o9URzpITTAMHKnTMpiT0Si7YSyA1N8FC9lUfGQjfRi GFTi9oHhcbjPiBwW3p0kFIegekB0r4HPRDoolTgRCfIgJomSnGJcQQ/z16aPEjKLsOoK pdVhvwZFIFdlq5LnFuKqr6FlmXpgJW9f9nBfwHLviLdIgCUAg61wOvHpfmQgbwLZpQqG BSXF3pPoD4T4o4ikEYipnQMsX5Q0Q+r9iSrZEh9TcKvFHzK8wxCQcXz/fXCNOlLwIxle TtadZkAcwW3WOU2jiH9gpAptXMvL1bUo8531CYW+98x0iDi1nDynwCD1jLhLMT6Ca0dK SqNw== X-Gm-Message-State: AOAM533Br/vDdJja5bgkDaS1HJd0vgboG6Ee6rsrlYn3sUJLE4bEej68 pX3lapjTSuVlJwETzhYXbuIypef4RwMCsEbKssY= X-Google-Smtp-Source: ABdhPJxBMrynxyAmEuZVv9LuIz06tIes1P0/ZQj3AQWscVUvE2zt/WDYQVICvMnTs++j9WIGBb/QMCUTkCn1lpeTKkM= 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:9a4b:: with SMTP id q11mr6580741qvd.29.1601416043698; Tue, 29 Sep 2020 14:47:23 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:24 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 22/29] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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" 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. -- 2.28.0.709.gb0816b6eb0-goog