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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT 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 F1B62C004C9 for ; Tue, 7 May 2019 05:43:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C3DFD20578 for ; Tue, 7 May 2019 05:43:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207801; bh=9WXawZNnulOTgBEcYcDCkjcBWrkrOS5qKpa52igguuQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EsivlOOWKokHABI6xjC4eTgk3hoe6iOPbD63N6XZsHxltwFLewV7UJ3H2ecqaK9CX zBViXnYRhnWCNz/oH1hukFub8xWUzCHJDSOlj59BbRD1cAVfKL1P2/HJCulTdQ2gNi +qTbakzUPbEmsmwUjXKPE+kVl3OzUdd69flNc/R8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729741AbfEGFnP (ORCPT ); Tue, 7 May 2019 01:43:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:33834 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729426AbfEGFnG (ORCPT ); Tue, 7 May 2019 01:43:06 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AAFD7205ED; Tue, 7 May 2019 05:43:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207786; bh=9WXawZNnulOTgBEcYcDCkjcBWrkrOS5qKpa52igguuQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uMfDNDQbUDyl5OjznW4pKlWklu4rLVWnvoDtG6Y/nadjt1YFn8RWk4HZqlxw286PR m40BY7L81Ei7Crpmp0Uzx0qvWJ4iH6hdnqSjpBdH3Fb0/MufY2N5VDzFUbJnucfett +PRRmFZwLpfKn6uWVdRRzbesAasQLfK6WZrJHoak= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Williams , Guenter Roeck , Kees Cook , Mathieu Desnoyers , Thomas Gleixner , Mike Rapoport , Russell King , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL 3.18 07/10] init: initialize jump labels before command line option parsing Date: Tue, 7 May 2019 01:42:43 -0400 Message-Id: <20190507054247.537-7-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507054247.537-1-sashal@kernel.org> References: <20190507054247.537-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Williams [ Upstream commit 6041186a32585fc7a1d0f6cfe2f138b05fdc3c82 ] When a module option, or core kernel argument, toggles a static-key it requires jump labels to be initialized early. While x86, PowerPC, and ARM64 arrange for jump_label_init() to be called before parse_args(), ARM does not. Kernel command line: rdinit=/sbin/init page_alloc.shuffle=1 panic=-1 console=ttyAMA0,115200 page_alloc.shuffle=1 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at ./include/linux/jump_label.h:303 page_alloc_shuffle+0x12c/0x1ac static_key_enable(): static key 'page_alloc_shuffle_key+0x0/0x4' used before call to jump_label_init() Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 5.1.0-rc4-next-20190410-00003-g3367c36ce744 #1 Hardware name: ARM Integrator/CP (Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x18) [] (show_stack) from [] (dump_stack+0x18/0x24) [] (dump_stack) from [] (__warn+0xe0/0x108) [] (__warn) from [] (warn_slowpath_fmt+0x44/0x6c) [] (warn_slowpath_fmt) from [] (page_alloc_shuffle+0x12c/0x1ac) [] (page_alloc_shuffle) from [] (shuffle_store+0x28/0x48) [] (shuffle_store) from [] (parse_args+0x1f4/0x350) [] (parse_args) from [] (start_kernel+0x1c0/0x488) Move the fallback call to jump_label_init() to occur before parse_args(). The redundant calls to jump_label_init() in other archs are left intact in case they have static key toggling use cases that are even earlier than option parsing. Link: http://lkml.kernel.org/r/155544804466.1032396.13418949511615676665.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Reported-by: Guenter Roeck Reviewed-by: Kees Cook Cc: Mathieu Desnoyers Cc: Thomas Gleixner Cc: Mike Rapoport Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- init/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/init/main.c b/init/main.c index 32940a68ea48..6235c0bed3da 100644 --- a/init/main.c +++ b/init/main.c @@ -539,6 +539,8 @@ asmlinkage __visible void __init start_kernel(void) page_alloc_init(); pr_notice("Kernel command line: %s\n", boot_command_line); + /* parameters may set static keys */ + jump_label_init(); parse_early_param(); after_dashes = parse_args("Booting kernel", static_command_line, __start___param, @@ -548,8 +550,6 @@ asmlinkage __visible void __init start_kernel(void) parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, set_init_arg); - jump_label_init(); - /* * These use large bootmem allocations and must precede * kmem_cache_init() -- 2.20.1