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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 7C709C4360C for ; Thu, 10 Oct 2019 08:51:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 50EAF20679 for ; Thu, 10 Oct 2019 08:51:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570697483; bh=GfMU6NPelHlvFmGORedtTXOGNLXmUvHgoBCKH6STcto=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cudE7LdohxoieEe8ymH17vjrZGI94uoedtFJ/L/MBehc1mBafej3CFw8CAuU0ymj6 QL5Un5ccynW/rbKLplQCjOtPlk4+XISgcLhfgWPrLxkVQ2yxw94Eb2UGyXrarZOsXQ JFcW/SmUcERBmK+pCY2gJ/3Me8ph/XZqgUd70uVE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389737AbfJJIvW (ORCPT ); Thu, 10 Oct 2019 04:51:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:58644 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388950AbfJJIvP (ORCPT ); Thu, 10 Oct 2019 04:51:15 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 876B020679; Thu, 10 Oct 2019 08:51:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570697474; bh=GfMU6NPelHlvFmGORedtTXOGNLXmUvHgoBCKH6STcto=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lXyzP2POCc/r64pJB4+72lyjP+9ikg1qKBMiWeyhZkMIRowHGvb/lHUkSf3KWrAOH RUMIR7KGfsbpC96S37/bHoO34OtBjCPti19QurylU88kj6OVpayuThpT4khrnJoMm2 XTpIhuYoiexa8ccaoWc5qKxOakvPCCcPOcVwoNgY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, KeMeng Shi , "Peter Zijlstra (Intel)" , Valentin Schneider , Linus Torvalds , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.14 41/61] sched/core: Fix migration to invalid CPU in __set_cpus_allowed_ptr() Date: Thu, 10 Oct 2019 10:37:06 +0200 Message-Id: <20191010083516.222902799@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191010083449.500442342@linuxfoundation.org> References: <20191010083449.500442342@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: KeMeng Shi [ Upstream commit 714e501e16cd473538b609b3e351b2cc9f7f09ed ] An oops can be triggered in the scheduler when running qemu on arm64: Unable to handle kernel paging request at virtual address ffff000008effe40 Internal error: Oops: 96000007 [#1] SMP Process migration/0 (pid: 12, stack limit = 0x00000000084e3736) pstate: 20000085 (nzCv daIf -PAN -UAO) pc : __ll_sc___cmpxchg_case_acq_4+0x4/0x20 lr : move_queued_task.isra.21+0x124/0x298 ... Call trace: __ll_sc___cmpxchg_case_acq_4+0x4/0x20 __migrate_task+0xc8/0xe0 migration_cpu_stop+0x170/0x180 cpu_stopper_thread+0xec/0x178 smpboot_thread_fn+0x1ac/0x1e8 kthread+0x134/0x138 ret_from_fork+0x10/0x18 __set_cpus_allowed_ptr() will choose an active dest_cpu in affinity mask to migrage the process if process is not currently running on any one of the CPUs specified in affinity mask. __set_cpus_allowed_ptr() will choose an invalid dest_cpu (dest_cpu >= nr_cpu_ids, 1024 in my virtual machine) if CPUS in an affinity mask are deactived by cpu_down after cpumask_intersects check. cpumask_test_cpu() of dest_cpu afterwards is overflown and may pass if corresponding bit is coincidentally set. As a consequence, kernel will access an invalid rq address associate with the invalid CPU in migration_cpu_stop->__migrate_task->move_queued_task and the Oops occurs. The reproduce the crash: 1) A process repeatedly binds itself to cpu0 and cpu1 in turn by calling sched_setaffinity. 2) A shell script repeatedly does "echo 0 > /sys/devices/system/cpu/cpu1/online" and "echo 1 > /sys/devices/system/cpu/cpu1/online" in turn. 3) Oops appears if the invalid CPU is set in memory after tested cpumask. Signed-off-by: KeMeng Shi Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Valentin Schneider Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/1568616808-16808-1-git-send-email-shikemeng@huawei.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/sched/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3d24d401b9d42..32ba789c544ca 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1111,7 +1111,8 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, if (cpumask_equal(&p->cpus_allowed, new_mask)) goto out; - if (!cpumask_intersects(new_mask, cpu_valid_mask)) { + dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask); + if (dest_cpu >= nr_cpu_ids) { ret = -EINVAL; goto out; } @@ -1132,7 +1133,6 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, if (cpumask_test_cpu(task_cpu(p), new_mask)) goto out; - dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask); if (task_running(rq, p) || p->state == TASK_WAKING) { struct migration_arg arg = { p, dest_cpu }; /* Need help from migration thread: drop lock and wait. */ -- 2.20.1