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=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 C018AC43464 for ; Fri, 18 Sep 2020 20:15:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6703320684 for ; Fri, 18 Sep 2020 20:15:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="UfHLbm8n" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726658AbgIRUPi (ORCPT ); Fri, 18 Sep 2020 16:15:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726619AbgIRUPc (ORCPT ); Fri, 18 Sep 2020 16:15:32 -0400 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 8AD3BC0613CF for ; Fri, 18 Sep 2020 13:15:32 -0700 (PDT) Received: by mail-qt1-x849.google.com with SMTP id e6so6110556qtg.13 for ; Fri, 18 Sep 2020 13:15:32 -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=X2rJBbb/dAb+yfnrEjkjEFh1Qlc3T9c6r5OVY+2F28Q=; b=UfHLbm8nbc7nF4Jo2yUgHO34FEnYwaE+D6WpRyYM9fua/f1c+fZ8kF6HsVdGT3ZStz DIioQeeYjH1vQBjYBq6RWn1tj8Ze0d8QdJv/5ZoCfD/OJopHg281EA0NzxBu0bnxaWZh gx+JUnvc4+vXR4wjKioKlFelZxpe0ui4Lh1MT956XxN4Ky84dI7eVbp7usD/4ORebyXi CldVhYDtXNAYA4NGIwtBdJpXhE9cy2RjWHBM1Uc8TjKab8xO1nXAuOuk6CkQAwAWw4AW +5M/W/XGQlX5ApQtgCjOdjNKX53WnhGd309U+vDRlJPdbYtPQkUcz7FocAivoRqNyi4G Nh3w== 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=X2rJBbb/dAb+yfnrEjkjEFh1Qlc3T9c6r5OVY+2F28Q=; b=RETLt9CbGa8pWPV7UNX49dHALsNcciDoK/1rutB/XIRnrMJNVDcNHHoG80kigaW6I1 8TqMPBy36dhmLZCxXV4UtdlzBRbwYjHslFfzBW0rLBnqnyrmC367FnFnYM/Aj5H1hjui Ypyl1KeAHJINP9ivJFq5u2qiXSg+VmpHszaMcigEWsi/Y2rxE1DjyWM+nBeqSgHAT8Jx gmxRsgwg6bgSbPVWEECA7V3U+THq18zNIUVGBjVagRxHWz4Hb9lbEgIQPf4809/4aEN/ O7TP2dsNhVrDhlSXTFxyL7AdnCyuAfzFv7iDeEfn7ht8itYI7zjhazF52io6TYciOBV5 NQXw== X-Gm-Message-State: AOAM532q2+nCebzHe6go/MsTdDMm+J6M5U+SP+twNcfxyYQc6YHRsujS pd53DYr2oo8OmywpcceQQp3e+aTleNo+BuvpVvQ= X-Google-Smtp-Source: ABdhPJzo4LTM6y/+DCzOvBKNO4aVvzGwT/r1d/eIrsPqlXmeiMn37vjIcaP3n6Xyzc5vYh3xJFK8sACdwTT13Li7Iew= 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:ad4:5a0e:: with SMTP id ei14mr20725499qvb.15.1600460131755; Fri, 18 Sep 2020 13:15:31 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:28 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20200918201436.2932360-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v3 22/30] 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 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. -- 2.28.0.681.g6f77f65b4e-goog