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 8B5F8C43219 for ; Thu, 20 Jan 2022 02:08:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358182AbiATCIy (ORCPT ); Wed, 19 Jan 2022 21:08:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358177AbiATCIt (ORCPT ); Wed, 19 Jan 2022 21:08:49 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0138EC061574 for ; Wed, 19 Jan 2022 18:08:49 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 91744615D4 for ; Thu, 20 Jan 2022 02:08:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4A78C004E1; Thu, 20 Jan 2022 02:08:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1642644528; bh=6ZS2c7rQZjT6EOdTYJmUQ9a2uPJLE7boRUudWSDBDVQ=; h=Date:From:To:Subject:In-Reply-To:From; b=q01OU8bBfwD2a1G5SkW83CMZUIlg4XUev6ktVMjlXQwDIG7c2yDpno/LvZ00VKKXR VxJu5ETBOWxH/yYVg/u0ocalADdsmjGYDZUag9hW/PrJfLyQjBC8DjwVXy8V3nhO2n 0wJXGLctj4frTkSOuXf66MhvhUQ8RSrbEpWAlFSc= Date: Wed, 19 Jan 2022 18:08:47 -0800 From: Andrew Morton To: akpm@linux-foundation.org, dave@stgolabs.net, dbueso@suse.de, linux-mm@kvack.org, mm-commits@vger.kernel.org, oleg@redhat.com, torvalds@linux-foundation.org Subject: [patch 20/55] kernel/sys.c: only take tasklist_lock for get/setpriority(PRIO_PGRP) Message-ID: <20220120020847.8t0ZohHcP%akpm@linux-foundation.org> In-Reply-To: <20220119180714.9e187ce100e4510de3cd9f7d@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Davidlohr Bueso Subject: kernel/sys.c: only take tasklist_lock for get/setpriority(PRIO_PGRP) PRIO_PGRP needs the tasklist_lock mainly to serialize vs setpgid(2), to protect against any concurrent change_pid(PIDTYPE_PGID) that can move the task from one hlist to another while iterating. However, the remaining can only rely only on RCU: PRIO_PROCESS only does the task lookup and never iterates over tasklist and we already have an rcu-aware stable pointer. PRIO_USER is already racy vs setuid(2) so with creds being rcu protected, we can end up seeing stale data. When removing the tasklist_lock there can be a race with (i) fork but this is benign as the child's nice is inherited and the new task is not observable by the user yet either, hence the return semantics do not differ. And (ii) a race with exit, which is a small window and can cause us to miss a task which was removed from the list and it had the highest nice. Similarly change the buggy do_each_thread/while_each_thread combo in PRIO_USER for the rcu-safe for_each_process_thread flavor, which doesn't make use of next_thread/p->thread_group. [akpm@linux-foundation.org: coding style fixes] Link: https://lkml.kernel.org/r/20211210182250.43734-1-dave@stgolabs.net Signed-off-by: Davidlohr Bueso Acked-by: Oleg Nesterov Signed-off-by: Andrew Morton --- kernel/sys.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/kernel/sys.c~kernel-sys-only-take-tasklist_lock-for-get-setpriorityprio_pgrp +++ a/kernel/sys.c @@ -220,7 +220,6 @@ SYSCALL_DEFINE3(setpriority, int, which, niceval = MAX_NICE; rcu_read_lock(); - read_lock(&tasklist_lock); switch (which) { case PRIO_PROCESS: if (who) @@ -235,9 +234,11 @@ SYSCALL_DEFINE3(setpriority, int, which, pgrp = find_vpid(who); else pgrp = task_pgrp(current); + read_lock(&tasklist_lock); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { error = set_one_prio(p, niceval, error); } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); + read_unlock(&tasklist_lock); break; case PRIO_USER: uid = make_kuid(cred->user_ns, who); @@ -249,16 +250,15 @@ SYSCALL_DEFINE3(setpriority, int, which, if (!user) goto out_unlock; /* No processes for this user */ } - do_each_thread(g, p) { + for_each_process_thread(g, p) { if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) error = set_one_prio(p, niceval, error); - } while_each_thread(g, p); + } if (!uid_eq(uid, cred->uid)) free_uid(user); /* For find_user() */ break; } out_unlock: - read_unlock(&tasklist_lock); rcu_read_unlock(); out: return error; @@ -283,7 +283,6 @@ SYSCALL_DEFINE2(getpriority, int, which, return -EINVAL; rcu_read_lock(); - read_lock(&tasklist_lock); switch (which) { case PRIO_PROCESS: if (who) @@ -301,11 +300,13 @@ SYSCALL_DEFINE2(getpriority, int, which, pgrp = find_vpid(who); else pgrp = task_pgrp(current); + read_lock(&tasklist_lock); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); + read_unlock(&tasklist_lock); break; case PRIO_USER: uid = make_kuid(cred->user_ns, who); @@ -317,19 +318,18 @@ SYSCALL_DEFINE2(getpriority, int, which, if (!user) goto out_unlock; /* No processes for this user */ } - do_each_thread(g, p) { + for_each_process_thread(g, p) { if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) { niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } - } while_each_thread(g, p); + } if (!uid_eq(uid, cred->uid)) free_uid(user); /* for find_user() */ break; } out_unlock: - read_unlock(&tasklist_lock); rcu_read_unlock(); return retval; _