From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754945AbaCKMhT (ORCPT ); Tue, 11 Mar 2014 08:37:19 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35538 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752972AbaCKMhR (ORCPT ); Tue, 11 Mar 2014 08:37:17 -0400 Date: Tue, 11 Mar 2014 05:36:36 -0700 From: tip-bot for Juri Lelli Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, juri.lelli@gmail.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, juri.lelli@gmail.com In-Reply-To: <1393844961-18097-1-git-send-email-juri.lelli@gmail.com> References: <1393844961-18097-1-git-send-email-juri.lelli@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/deadline: Deny unprivileged users to set/ change SCHED_DEADLINE policy Git-Commit-ID: d44753b843e093f9e1f2f14806fbe106fff74898 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: d44753b843e093f9e1f2f14806fbe106fff74898 Gitweb: http://git.kernel.org/tip/d44753b843e093f9e1f2f14806fbe106fff74898 Author: Juri Lelli AuthorDate: Mon, 3 Mar 2014 12:09:21 +0100 Committer: Ingo Molnar CommitDate: Tue, 11 Mar 2014 11:33:46 +0100 sched/deadline: Deny unprivileged users to set/change SCHED_DEADLINE policy Deny the use of SCHED_DEADLINE policy to unprivileged users. Even if root users can set the policy for normal users, we don't want the latter to be able to change their parameters (safest behavior). Signed-off-by: Juri Lelli Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1393844961-18097-1-git-send-email-juri.lelli@gmail.com Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 6edbef2..f5c6635 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3338,6 +3338,15 @@ recheck: return -EPERM; } + /* + * Can't set/change SCHED_DEADLINE policy at all for now + * (safest behavior); in the future we would like to allow + * unprivileged DL tasks to increase their relative deadline + * or reduce their runtime (both ways reducing utilization) + */ + if (dl_policy(policy)) + return -EPERM; + /* * Treat SCHED_IDLE as nice 20. Only allow a switch to * SCHED_NORMAL if the RLIMIT_NICE would normally permit it.