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prctl: adds the capable(CAP_SYS_NICE) check to PR_SET_TIMERSLACK_PID.
[firefly-linux-kernel-4.4.55.git]
/
kernel
/
sys.c
diff --git
a/kernel/sys.c
b/kernel/sys.c
index fd06809929129465f96e38aa47a5d84a0bcad490..d448bad888238512458763828ef17dc4940b6055 100644
(file)
--- a/
kernel/sys.c
+++ b/
kernel/sys.c
@@
-2201,6
+2201,9
@@
SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
return -EINVAL;
break;
case PR_SET_TIMERSLACK_PID:
+ if (current->pid != (pid_t)arg3 &&
+ !capable(CAP_SYS_NICE))
+ return -EPERM;
rcu_read_lock();
tsk = find_task_by_pid_ns((pid_t)arg3, &init_pid_ns);
if (tsk == NULL) {