From: Parth Shah <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>
[rebase]
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
kernel/sched/core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2015e7d1f8b2..3c79c5419d1b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7444,6 +7444,10 @@ 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