From patchwork Tue Dec 1 21:37:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11943987 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=-26.2 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, 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 2BA80C83018 for ; Tue, 1 Dec 2020 21:39:37 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 34D952085B for ; Tue, 1 Dec 2020 21:39:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ty5f8H7k" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34D952085B 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-20502-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 20072 invoked by uid 550); 1 Dec 2020 21:37:57 -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 19997 invoked from network); 1 Dec 2020 21:37:56 -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=D9wH7plBpsyKB7z0MJo6lESfcO9at50jK7OVp+0NdAo=; b=ty5f8H7kzpU+lvDsHXGI++1V0wurJB7DQJHEXEwufmtrCxIRoiPJOPP1X/3lLsz1Jb yjTR/AGDyQQn3kRjvvw2d88GiqDY8VcvMWomB5DuCrtNFFxHuktvMeKvMrFz+Xfk1Q77 MRmeM7k7VctuQepKTW4pproEuOE+zIwcrFORj2gPW2IlyOU7IhN8JpWoK+mpfeUx5C/d ojaTkHbYjh10G7mgJCJekN588v9SPU5sVPQSTu4fzbRdcVzLgMGzXyAyI0u1gJhvAtr+ L9s0tFmZLbeuu51bgQUHw9Ysitz1s+n7ja3zUrLOpDRRdxizWkaeqCKUaIf410z146BI /CXw== 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=CalhbjHn+wTZd0Xt1j15E2Dric/obIr/GBvddW2wZ+iBjpaBQoc6KJzm6LK5R93GI5 5GC5TM67xb79pWTTgrP3S3L9gl1fdhuglHPs0km23uv3yk4vNCFGRX8geu1b9CgT0AaI 4bHrU94jMVS6lEw7t4vfx2nn6g49nB2CINtGPMtD5LnGJk05MlF4I/qBt2UOyoK+Zru+ aAkBTP8rwF083ssMvKzjuGXoL1uYISkVoKKtgJIpJNyCkd091wmM/2B6it5Pcu8vtP+P CadkXiI/Vk/A2sp7M6a+7d5aou5FqmVougHOA8FbXE1KpCXbU28DHsnelS8WeSJve+/j /vBA== X-Gm-Message-State: AOAM532I6h37GrXufT2g/6DmjMeyuBeuOxvj+ReRRd4Lb9p521ctbm/B 7SSsfzZ6cICRLHc65lMR5Hy58Z7PwmoXXUwxp6g= X-Google-Smtp-Source: ABdhPJz0uxxT0ZlEK90fhImd7lL6Fuzds0C69/eAFTomtuQ0mN0EZEi1KhWi4R7wk6mCpdkDbecP4SoP9hzTb5uJL7A= 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:ad4:4d84:: with SMTP id cv4mr5421264qvb.14.1606858664762; Tue, 01 Dec 2020 13:37:44 -0800 (PST) Date: Tue, 1 Dec 2020 13:37:05 -0800 In-Reply-To: <20201201213707.541432-1-samitolvanen@google.com> Message-Id: <20201201213707.541432-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20201201213707.541432-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v8 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 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