From patchwork Fri Dec 11 18:46:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11969349 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=-26.3 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, 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 4B22BC4361B for ; Fri, 11 Dec 2020 20:26:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3A342074B for ; Fri, 11 Dec 2020 20:26:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436850AbgLKStd (ORCPT ); Fri, 11 Dec 2020 13:49:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389233AbgLKSsw (ORCPT ); Fri, 11 Dec 2020 13:48:52 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45147C0610F2 for ; Fri, 11 Dec 2020 10:47:04 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id m203so11802083ybf.1 for ; Fri, 11 Dec 2020 10:47:04 -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=D9wH7plBpsyKB7z0MJo6lESfcO9at50jK7OVp+0NdAo=; b=o9YQ2WaCNG8K0/fs9UJt8tjJkZt2V+zu8nGyyzGv31aRlZwzdERkcEEzcsjJzK7Khh Fk/jL/s8l2hJliwPNQGXJKzeEfZAhZNL3N7YQubgkjL3MBt3ZaOHRNJKHKyKgl7rzP3r CbLCHOiTVvpx23P8dNWk0S8pTKQys5/iAUXEqkbZkIdXP67EvijrZ7suaxN5SM1AiGUg Czctp/iCgtSTfOnV6MNPNWCT9Gw6yx2WXcKk+pz2gFHpPVleQlFs2WHsbthps4QXwlxm 5FQuFyoHqaAxpIDOc7NISukhUKz44T2F+pYRZntubJg1eb5X5qyK7NUJ7/Bfmj3XKKx9 8T1w== 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=D9wH7plBpsyKB7z0MJo6lESfcO9at50jK7OVp+0NdAo=; b=Wl3DlyO1SHY15Pw5slTL6d93UP9xC8bUsznLpz172Oj9OI4NmpkbfC1cZ7TWQfcHrS dewZS3eDwgj+rR2gBQlsh3Mknru6n+JfbdtoLCWhTor/hY0wORk9ILM3sTMJha+8hAwj /logESBK1C2o+7BD3LHvBUR7FuQOd6e8NivPxxFYj+u9oKh1J9cD7A2jt7fTTgQfxohg I2PwNb9ZuyvtiFIgrjW9ZWlMlmOuVhjap7iaKfJCwIdVxHievE9GYXtIPXy0DP45f262 o/Hu2RS46YsfPOH2fWEOeAwSagJxNpA3FODs7i4HcCNsq2ooIli/e7NHlTlrsNLa8/zg 4E4Q== X-Gm-Message-State: AOAM533SiOOQk3W+ubhtEhpdLH5VhUXNFZI5QVjG6+tH057SBcHpBeM2 HgrHE7/5cUQM4eM6HW2J4Oe7jWv7BaBwQCy+8z4= X-Google-Smtp-Source: ABdhPJznzuiVO4idqxJMtdzoCHbXvL/GitFw7UhsVnJ6x3E9oWq6Kdg+IUkD+jO4kIRIFWgi1U7nyXaq6VyburgAblw= 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:a25:6405:: with SMTP id y5mr12176868ybb.328.1607712423523; Fri, 11 Dec 2020 10:47:03 -0800 (PST) Date: Fri, 11 Dec 2020 10:46:31 -0800 In-Reply-To: <20201211184633.3213045-1-samitolvanen@google.com> Message-Id: <20201211184633.3213045-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20201211184633.3213045-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v9 14/16] arm64: vdso: 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 Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small amount of C code. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Acked-by: Will Deacon --- 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 d65f52264aba..50fe49fb4d95 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