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=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 6769BC433E7 for ; Fri, 9 Oct 2020 16:15:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 274282227E for ; Fri, 9 Oct 2020 16:15:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="M0h0mH4w" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389599AbgJIQPt (ORCPT ); Fri, 9 Oct 2020 12:15:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389452AbgJIQOw (ORCPT ); Fri, 9 Oct 2020 12:14:52 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60698C0613E1 for ; Fri, 9 Oct 2020 09:14:25 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id y24so6636588plr.20 for ; Fri, 09 Oct 2020 09:14:25 -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=JHNK5VWD3ddVakk1msJzGMuIHjr7wcpFWGy1F5g4J2Y=; b=M0h0mH4wlOZcaJsIi5sQEuaiXKV7B0eKEoaPKg3kbfXsWnZ9dgEuFhvr4GvOUISD/R eAtFXUMTPEOVHW+XOblcQS/ISTtHpag/wILGcioqEck1N+9WCscWL7vFacbN6GUuar+k 4PnFjNWO2auD2wONFsEZeyA0wE6HkoReMLefaUGdvzHpzi2jFdR2nk7TLMGHQ6IGcOSj 3cIInTMXmsjJLQw59hUKMC6ilpXp3px/V6+ZuAnx5tBy0UDfBXrEN1SKQjcZ2XbWb2iB va5v3rnvQOCmgyUdtx7z8zjGiV0r6NCEuQQzlxkUNcl+QUN74zldCyfQQhUYvV8F8BwK NdzQ== 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=JHNK5VWD3ddVakk1msJzGMuIHjr7wcpFWGy1F5g4J2Y=; b=HVI093xNdgyykbSQVCPuNR+aqybehMR2m71yWPQSJiq2Np9DK4CFIyZGrxSNXSG8jo 5UQZjLj9deXQei53cNTebbqGA6Z1YfhGkl3jr8QWDbyUBR4hI5BcUHhvJQ6axHCso5ks SVvaTLqTkODIReASjb3lVDLHcspifPB2XN4BQe+gba21THrKCfu1RpfTzLhFO87tFAS5 TRnF/Yxt50qa9vMlooURSj/K3LOpIDk4bIicqoHPbhd5Y5qIpI4eXc2OrCBP9B7Nxdxu Jdyp5pq6xHgyj6WyMSUrv8cpGt5frnP47pyqoU39e52nrNikNRQMZmWNvbenOcixz2Xg ZipA== X-Gm-Message-State: AOAM530AU11HSZP0Vmb5rCvYF7UQ8k0ntLOJk8rjdKTCbzw/NGXwdgKA NsS1PQM/yjD1jBv5NcRnPjRa3/HhYgSCgGt4fLo= X-Google-Smtp-Source: ABdhPJyNU5RpFXb6oDaPa5kfxyMLH3rqIIuf9in4Eo1ivOzj/QSIy554fzdbu1UoaF9jnvjswSLNZfW1sHDa3cxCuBM= 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:a62:7a53:0:b029:152:5482:8935 with SMTP id v80-20020a627a530000b029015254828935mr13281502pfc.31.1602260064759; Fri, 09 Oct 2020 09:14:24 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:31 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 22/29] arm64: vdso: 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 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 -- 2.28.0.1011.ga647a8990f-goog