From patchwork Fri Sep 18 20:14:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11786059 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 4634B139A for ; Fri, 18 Sep 2020 20:15:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E16C23600 for ; Fri, 18 Sep 2020 20:15:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="lu5o9R8g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726683AbgIRUPp (ORCPT ); Fri, 18 Sep 2020 16:15:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726672AbgIRUPk (ORCPT ); Fri, 18 Sep 2020 16:15:40 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00BCDC0613D1 for ; Fri, 18 Sep 2020 13:15:39 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id r128so5598451qkc.9 for ; Fri, 18 Sep 2020 13:15:39 -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=TqIl0XsuMws2W7SAyTGgPlMUxJpmV31lTKH8j5/4FZ8=; b=lu5o9R8gm3jqcUgmwu4AY/DoLfD5wt5MOlJd0k40tfngeaf8Nt07Vk6ePP9t8NlEZN IVqlDHPcBWhQmmotn4u+3EefhUJi4+cheG5oC6RvYmB7RkBMe7EstPG5yMRAIDKgu2g4 axLl7OmVkBvP92Q0Qbvl1A+S7pF0924SmotebecxUz5whagk2WPh1iNdxekOtLgSwwwo 0Ns1oRsUkHTg+U1kphL0FSFJspdH6IcYbg1jpew7/hIrVEFAzVHH8yr+R74J5oNr2P3K IdJppxeqyy0BnWW1z/jWEr6bH3y/3VeXHdJFclXUQXKes6i8fQsPsWgt1B/kImbNCuTX cjBw== 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=TqIl0XsuMws2W7SAyTGgPlMUxJpmV31lTKH8j5/4FZ8=; b=uMDfEGLg6bFiv1cg7mLpLmQTqP9SCyApTW6Z6+rP6iVA5gR3oIIo6IgPCLuoG+VNI0 HWVbeQHOv4bEhsxeVa2NmnuHojVDtvhLhlm9pq/MvcFR8PRznDZ3nYx3btbGUiSbNc6I tuZ0VdNhiv84Qa312e3+uUeTuxi8Noie2LjjTs6Tud8BrH490qskLDPd/A7DrC32Blh7 7MvQq4Ut3QNVgKk5eWpb8IUe99AHK0belejQpE7/lTBJ1jvzAwAtsUtu2sjAD2COtOS5 3AFWSQhq8NM+frMjQXdY41romcsXtRstLWE6KaQdFxT81jA5+jLBCv3sjjiPU3UX64UQ MluQ== X-Gm-Message-State: AOAM531l5uO0Drf3EYVTWZfMM4vAu13nTF6Kf//6vkBMA9k5/ShhIscd orQ2wHlID+WxZPiJN/HdpDq2M0bmVW9yaPDZrOo= X-Google-Smtp-Source: ABdhPJzM+bDDdhQ1yuvEohGu3NxsCeWWPsxJypy/LfG2x1PLzd9dzX2AyM5yRCrQ0RzzRR4VA988AWIJ4v9Gjkgti5E= 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:ad4:58e7:: with SMTP id di7mr18639207qvb.36.1600460139023; Fri, 18 Sep 2020 13:15:39 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:31 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-26-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 25/30] arm64: vdso: 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 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small about of C code. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kernel/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index e836e300440f..aa47070a3ccf 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -30,7 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \ + $(CC_FLAGS_LTO) KASAN_SANITIZE := n UBSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD := y