Allow CAP_SYS_NICE to take effect for processes having effective uid of a
root user from init namespace.
Signed-off-by: Prakash Sangappa <prakash.sangappa@xxxxxxxxxx>
---
kernel/sched/core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7880f4f..628bd46 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4548,6 +4548,8 @@ int can_nice(const struct task_struct *p, const int nice)
int nice_rlim = nice_to_rlimit(nice);
return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
+ (ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE) &&
+ uid_eq(current_euid(), GLOBAL_ROOT_UID)) ||
capable(CAP_SYS_NICE));
}
@@ -4784,7 +4786,9 @@ static int __sched_setscheduler(struct task_struct *p,
/*
* Allow unprivileged RT tasks to decrease priority:
*/
- if (user && !capable(CAP_SYS_NICE)) {
+ if (user && !(ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE) &&
+ uid_eq(current_euid(), GLOBAL_ROOT_UID)) &&
+ !capable(CAP_SYS_NICE)) {
if (fair_policy(policy)) {
if (attr->sched_nice < task_nice(p) &&
!can_nice(p, attr->sched_nice))
--
2.7.4
