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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92D25C77B7A for ; Mon, 17 Apr 2023 17:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229940AbjDQRVT (ORCPT ); Mon, 17 Apr 2023 13:21:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbjDQRVS (ORCPT ); Mon, 17 Apr 2023 13:21:18 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 827F71709 for ; Mon, 17 Apr 2023 10:20:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681752011; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HiA04I5TuhFI/lYsjXbP9Mht2keJHuyuEUHApBl/a4c=; b=Oyw7cnF1G8qZSQzy0JTg+2wca6gwUoQk02u599PzbCS0/R8FLJlYJ21Swi2mTA4Wxi1Bif KEQHIVVQLSsq3decOp8Xu1YRk/vC4ocHqmlOZDU1HId5OxceyiZA77uASpsHUDZSSqk0W4 9ftCCOoXP/LJgkC+4fzuH3tMoLhKHxM= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-530-RRxRKDcOPme7psOFwi2NtQ-1; Mon, 17 Apr 2023 13:20:10 -0400 X-MC-Unique: RRxRKDcOPme7psOFwi2NtQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1F2F23C0E454; Mon, 17 Apr 2023 17:20:10 +0000 (UTC) Received: from llong.com (dhcp-17-153.bos.redhat.com [10.18.17.153]) by smtp.corp.redhat.com (Postfix) with ESMTP id E22824024C7B; Mon, 17 Apr 2023 17:20:09 +0000 (UTC) From: Waiman Long To: Greg Kroah-Hartman , stable@vger.kernel.org Cc: Tejun Heo , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Giuseppe Scrivano , Waiman Long Subject: [PATCH 5.10 4/4] cgroup/cpuset: Add cpuset_can_fork() and cpuset_cancel_fork() methods Date: Mon, 17 Apr 2023 13:19:58 -0400 Message-Id: <20230417171958.3389333-4-longman@redhat.com> In-Reply-To: <20230417171958.3389333-1-longman@redhat.com> References: <20230417171958.3389333-1-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit eee87853794187f6adbe19533ed79c8b44b36a91 upstream. In the case of CLONE_INTO_CGROUP, not all cpusets are ready to accept new tasks. It is too late to check that in cpuset_fork(). So we need to add the cpuset_can_fork() and cpuset_cancel_fork() methods to pre-check it before we can allow attachment to a different cpuset. We also need to set the attach_in_progress flag to alert other code that a new task is going to be added to the cpuset. Fixes: ef2c41cf38a7 ("clone3: allow spawning processes into cgroups") Suggested-by: Michal Koutný Signed-off-by: Waiman Long Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Tejun Heo --- kernel/cgroup/cpuset.c | 88 +++++++++++++++++++++++++++++++++++++++--- 1 file changed, 83 insertions(+), 5 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 0704d1baa8ee..42ee719cc04f 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2151,6 +2151,18 @@ static int fmeter_getrate(struct fmeter *fmp) static struct cpuset *cpuset_attach_old_cs; +/* + * Check to see if a cpuset can accept a new task + * For v1, cpus_allowed and mems_allowed can't be empty. + */ +static int cpuset_can_attach_check(struct cpuset *cs) +{ + if (!is_in_v2_mode() && + (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))) + return -ENOSPC; + return 0; +} + /* Called by cgroups to determine if a cpuset is usable; cpuset_rwsem held */ static int cpuset_can_attach(struct cgroup_taskset *tset) { @@ -2165,10 +2177,8 @@ static int cpuset_can_attach(struct cgroup_taskset *tset) percpu_down_write(&cpuset_rwsem); - /* allow moving tasks into an empty cpuset if on default hierarchy */ - ret = -ENOSPC; - if (!is_in_v2_mode() && - (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))) + ret = cpuset_can_attach_check(cs); + if (ret) goto out_unlock; cgroup_taskset_for_each(task, css, tset) { @@ -2185,7 +2195,6 @@ static int cpuset_can_attach(struct cgroup_taskset *tset) * changes which zero cpus/mems_allowed. */ cs->attach_in_progress++; - ret = 0; out_unlock: percpu_up_write(&cpuset_rwsem); return ret; @@ -2908,6 +2917,68 @@ static void cpuset_bind(struct cgroup_subsys_state *root_css) percpu_up_write(&cpuset_rwsem); } +/* + * In case the child is cloned into a cpuset different from its parent, + * additional checks are done to see if the move is allowed. + */ +static int cpuset_can_fork(struct task_struct *task, struct css_set *cset) +{ + struct cpuset *cs = css_cs(cset->subsys[cpuset_cgrp_id]); + bool same_cs; + int ret; + + rcu_read_lock(); + same_cs = (cs == task_cs(current)); + rcu_read_unlock(); + + if (same_cs) + return 0; + + lockdep_assert_held(&cgroup_mutex); + percpu_down_write(&cpuset_rwsem); + + /* Check to see if task is allowed in the cpuset */ + ret = cpuset_can_attach_check(cs); + if (ret) + goto out_unlock; + + ret = task_can_attach(task, cs->effective_cpus); + if (ret) + goto out_unlock; + + ret = security_task_setscheduler(task); + if (ret) + goto out_unlock; + + /* + * Mark attach is in progress. This makes validate_change() fail + * changes which zero cpus/mems_allowed. + */ + cs->attach_in_progress++; +out_unlock: + percpu_up_write(&cpuset_rwsem); + return ret; +} + +static void cpuset_cancel_fork(struct task_struct *task, struct css_set *cset) +{ + struct cpuset *cs = css_cs(cset->subsys[cpuset_cgrp_id]); + bool same_cs; + + rcu_read_lock(); + same_cs = (cs == task_cs(current)); + rcu_read_unlock(); + + if (same_cs) + return; + + percpu_down_write(&cpuset_rwsem); + cs->attach_in_progress--; + if (!cs->attach_in_progress) + wake_up(&cpuset_attach_wq); + percpu_up_write(&cpuset_rwsem); +} + /* * Make sure the new task conform to the current state of its parent, * which could have been changed by cpuset just after it inherits the @@ -2942,6 +3013,11 @@ static void cpuset_fork(struct task_struct *task) else guarantee_online_cpus(cs, cpus_attach); cpuset_attach_task(cs, task); + + cs->attach_in_progress--; + if (!cs->attach_in_progress) + wake_up(&cpuset_attach_wq); + percpu_up_write(&cpuset_rwsem); } @@ -2955,6 +3031,8 @@ struct cgroup_subsys cpuset_cgrp_subsys = { .attach = cpuset_attach, .post_attach = cpuset_post_attach, .bind = cpuset_bind, + .can_fork = cpuset_can_fork, + .cancel_fork = cpuset_cancel_fork, .fork = cpuset_fork, .legacy_cftypes = legacy_files, .dfl_cftypes = dfl_files, -- 2.31.1