sched: Access control for sysctl_update_load_latency

hulk inclusion
category: feature
bugzilla: 175551 https://gitee.com/openeuler/kernel/issues/I4DDEL

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Add access control for sysctl_update_load_latency
Signed-off-by: NYu Jiahua <yujiahua1@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

kernel/sched/fair.c

@@ -52,6 +52,9 @@ int sysctl_update_load_latency(struct ctl_table *table, int write,
 	int latency = sysctl_load_tracking_latency;
 	struct ctl_table t;
 
+	if (write && !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	t = *table;
 	t.data = &latency;
 	t.extra1 = &min;