diff --git a/executer/kernel/mcctrl/control.c b/executer/kernel/mcctrl/control.c
index 99f6d87d..b41b8989 100644
--- a/executer/kernel/mcctrl/control.c
+++ b/executer/kernel/mcctrl/control.c
@@ -2459,9 +2459,12 @@ mcexec_sig_thread(ihk_os_t os, unsigned long arg, struct file *file)
 long
 mcexec_terminate_thread(ihk_os_t os, unsigned long *param, struct file *file)
 {
-	int pid = param[0];
-	int tid = param[1];
-	struct task_struct *tsk = (struct task_struct *)param[3];
+	unsigned long param[4];
+	int rc;
+	int pid;
+	int tid;
+	long sig;
+	struct task_struct *tsk;
 	unsigned long flags;
 	struct host_thread *thread;
 	struct host_thread *prev;
@@ -2469,6 +2472,17 @@ mcexec_terminate_thread(ihk_os_t os, unsigned long *param, struct file *file)
 	struct mcctrl_usrdata *usrdata = ihk_host_os_get_usrdata(os);
 	struct mcctrl_per_proc_data *ppd;
 
+    if (copy_from_user(param, arg, sizeof(unsigned long) * 4)) {
+        return -EFAULT;
+    }
+
+	pid = param[0];
+	tid = param[1];
+	sig = param[2];
+	tsk = (struct task_struct *)param[3];
+
+	//printk("%s: pid=%d,tid=%d,sig=%lx,task=%p\n", __FUNCTION__, pid, tid, sig, tsk);
+
 	write_lock_irqsave(&host_thread_lock, flags);
 	for (prev = NULL, thread = host_threads; thread;
 	     prev = thread, thread = thread->next) {