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: 11969063 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 736D9C433FE for ; Fri, 11 Dec 2020 18:49:05 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id BA26523F2A for ; Fri, 11 Dec 2020 18:49:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BA26523F2A 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-20596-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 9871 invoked by uid 550); 11 Dec 2020 18:47:15 -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 9831 invoked from network); 11 Dec 2020 18:47:15 -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=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=EDuqo/n7It7SdWxZleEXfsmF9QEoW5UE+oGU0aXfn7vezadDP4/3VWuChKRnTjLVW6 TFgpsbA3x7VyA7+8KeCgeh+L4SJ0ivWSc2sFaXLm6RkvFbQ/XYchjmV5J9qJW2U7rf5c +YdLOP2t0nqiFmVBLus3qHF+A5Tz8iqDfTPqP2tvmGeZDhJ4FnVX6wJfUFvfstzUL1SW 1dRjdju14tJW+idXhEynwUTYbl4tcImo3xgwlcNStEAz7QLULC2SpZaASIGpiwBKbulO +2pA1Yo1wWOQp/7NWLFIvFpUeFSWDfTEv1a1jVhbJXkqfE/7ZkVL2nJB+u6SWwcBSkXc RUwQ== X-Gm-Message-State: AOAM531zJnEtIPoYyyEtFbqD6tLs8JWfi1rsaB4BDUC6fLlrfpFnJ0Zx b3w/z6k09jNLQEMCNJXwmIu8Gvw8engE7Jmbm6o= 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 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