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From: Parth Shah <parth@linux.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, mingo@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	qais.yousef@arm.com, chris.hyser@oracle.com,
	patrick.bellasi@matbug.net, valentin.schneider@arm.com,
	David.Laight@ACULAB.COM, pjt@google.com, pavel@ucw.cz,
	tj@kernel.org, dhaval.giani@oracle.com, qperret@google.com,
	tim.c.chen@linux.intel.com
Subject: [PATCH v4 4/4] sched/core: Add permission checks for setting the latency_nice value
Date: Mon, 24 Feb 2020 14:29:18 +0530	[thread overview]
Message-ID: <20200224085918.16955-5-parth@linux.ibm.com> (raw)
In-Reply-To: <20200224085918.16955-1-parth@linux.ibm.com>

Since the latency_nice uses the similar infrastructure as NICE, use the
already existing CAP_SYS_NICE security checks for the latency_nice. This
should return -EPERM for the non-root user when trying to set the task
latency_nice value to any lower than the current value.

Signed-off-by: Parth Shah <parth@linux.ibm.com>
---
 kernel/sched/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e1dc536d4ca3..f883e1d3cd10 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4887,6 +4887,10 @@ static int __sched_setscheduler(struct task_struct *p,
 			return -EINVAL;
 		if (attr->sched_latency_nice < MIN_LATENCY_NICE)
 			return -EINVAL;
+		/* Use the same security checks as NICE */
+		if (attr->sched_latency_nice < p->latency_nice &&
+		    !can_nice(p, attr->sched_latency_nice))
+			return -EPERM;
 	}
 
 	if (pi)
-- 
2.17.2


  parent reply	other threads:[~2020-02-24  8:59 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  8:59 [PATCH v4 0/4] Introduce per-task latency_nice for scheduler hints Parth Shah
2020-02-24  8:59 ` [PATCH v4 1/4] sched: Introduce latency-nice as a per-task attribute Parth Shah
2020-02-24  8:59 ` [PATCH v4 2/4] sched/core: Propagate parent task's latency requirements to the child task Parth Shah
2020-02-25  6:32   ` Pavan Kondeti
2020-02-25  8:16     ` Parth Shah
2020-02-24  8:59 ` [PATCH v4 3/4] sched: Allow sched_{get,set}attr to change latency_nice of the task Parth Shah
2020-02-25  6:54   ` Pavan Kondeti
2020-02-25 15:03     ` Parth Shah
2020-02-26  3:44       ` Pavan Kondeti
2020-02-24  8:59 ` Parth Shah [this message]
2020-02-24 13:29   ` [PATCH v4 4/4] sched/core: Add permission checks for setting the latency_nice value Qais Yousef
2020-02-25  6:47     ` Parth Shah
2020-02-27 11:44       ` Qais Yousef
2020-02-27 14:46         ` chris hyser
2020-02-24 23:08   ` chris hyser

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