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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 C5359ECE599 for ; Wed, 16 Oct 2019 21:54:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D363218DE for ; Wed, 16 Oct 2019 21:54:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571262858; bh=aIQcL4b/tb/PvwmoHrsNLvrqkU7fYpR0I51Q/CTrS70=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qfcPDz+GeR6OZNRuVl1KV8h6wZLP+Z1PKEC9QWZ7z2owhxto4Wm+P+MwoVZxSyfyc h6if4iR/AHhiALhsyT0+XhzOlo2GKoysaUuA9TkCqJ+jFpGO/DgxurAMgfJVMGDWZ6 rY/K9YjX8R7iEyfTsqtU9ns2nuFgEsB6oy0IoLvs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728051AbfJPVyR (ORCPT ); Wed, 16 Oct 2019 17:54:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:43626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437661AbfJPVyE (ORCPT ); Wed, 16 Oct 2019 17:54:04 -0400 Received: from localhost (unknown [192.55.54.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3969C21D7C; Wed, 16 Oct 2019 21:54:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571262844; bh=aIQcL4b/tb/PvwmoHrsNLvrqkU7fYpR0I51Q/CTrS70=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z4v1V3DNsa0AhYE9Y1Mj752VLzQfAd8RAl2tSyFs55ZDrdT52o6BkthTG0SDHwpDu 1M6OhmHUBhnv3CBni48qSobIGAurhcMiaItcQJa8dOKasqB35qa9ssbUxgkvYfDhuH AVnTc30syxVhYqoY4F2ErMsTPaTBarjdyGE9m9cI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heiko Carstens , Vasily Gorbik Subject: [PATCH 4.9 02/92] s390/topology: avoid firing events before kobjs are created Date: Wed, 16 Oct 2019 14:49:35 -0700 Message-Id: <20191016214801.569162744@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016214759.600329427@linuxfoundation.org> References: <20191016214759.600329427@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vasily Gorbik commit f3122a79a1b0a113d3aea748e0ec26f2cb2889de upstream. arch_update_cpu_topology is first called from: kernel_init_freeable->sched_init_smp->sched_init_domains even before cpus has been registered in: kernel_init_freeable->do_one_initcall->s390_smp_init Do not trigger kobject_uevent change events until cpu devices are actually created. Fixes the following kasan findings: BUG: KASAN: global-out-of-bounds in kobject_uevent_env+0xb40/0xee0 Read of size 8 at addr 0000000000000020 by task swapper/0/1 BUG: KASAN: global-out-of-bounds in kobject_uevent_env+0xb36/0xee0 Read of size 8 at addr 0000000000000018 by task swapper/0/1 CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B Hardware name: IBM 3906 M04 704 (LPAR) Call Trace: ([<0000000143c6db7e>] show_stack+0x14e/0x1a8) [<0000000145956498>] dump_stack+0x1d0/0x218 [<000000014429fb4c>] print_address_description+0x64/0x380 [<000000014429f630>] __kasan_report+0x138/0x168 [<0000000145960b96>] kobject_uevent_env+0xb36/0xee0 [<0000000143c7c47c>] arch_update_cpu_topology+0x104/0x108 [<0000000143df9e22>] sched_init_domains+0x62/0xe8 [<000000014644c94a>] sched_init_smp+0x3a/0xc0 [<0000000146433a20>] kernel_init_freeable+0x558/0x958 [<000000014599002a>] kernel_init+0x22/0x160 [<00000001459a71d4>] ret_from_fork+0x28/0x30 [<00000001459a71dc>] kernel_thread_starter+0x0/0x10 Cc: stable@vger.kernel.org Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/topology.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -256,7 +256,8 @@ int arch_update_cpu_topology(void) topology_update_polarization_simple(); for_each_online_cpu(cpu) { dev = get_cpu_device(cpu); - kobject_uevent(&dev->kobj, KOBJ_CHANGE); + if (dev) + kobject_uevent(&dev->kobj, KOBJ_CHANGE); } return rc; }