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Date: Thu, 12 May 2022 18:35:31 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com, linux-kernel@...r.kernel.org, parth@...ux.ibm.com Cc: qais.yousef@....com, chris.hyser@...cle.com, valentin.schneider@....com, patrick.bellasi@...bug.net, David.Laight@...lab.com, pjt@...gle.com, pavel@....cz, tj@...nel.org, qperret@...gle.com, tim.c.chen@...ux.intel.com, joshdon@...gle.com, Vincent Guittot <vincent.guittot@...aro.org> Subject: [PATCH v2 4/7] sched/core: Add permission checks for setting the latency_nice value From: Parth Shah <parth@...ux.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@...ux.ibm.com> [rebase] Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org> --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 036bd9ff66e9..2c0f782a9089 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7340,6 +7340,10 @@ 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 && + !capable(CAP_SYS_NICE)) + return -EPERM; } if (pi) -- 2.17.1
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