load_elf: check mckernel execution

refs #758

executer/kernel/mcctrl/binfmt_mcexec.c

@@ -78,6 +78,9 @@ static int load_elf(struct linux_binprm *bprm
 	char *pbuf;
 	const char *path;
 
+	if (mcctrl_os_alive() == -1)
+		return -ENOEXEC;
+
 	if(bprm->envc == 0)
 		return -ENOEXEC;
 	if(memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0)

executer/kernel/mcctrl/driver.c

@@ -185,6 +185,16 @@ int mcctrl_os_shutdown_notifier(int os_index)
 	return 0;
 }
 
+int mcctrl_os_alive()
+{
+	int i;
+
+	for (i = 0; i < OS_MAX_MINOR; i++)
+		if (os[i])
+			return i;
+	return -1;
+}
+
 static struct ihk_os_notifier_ops mcctrl_os_notifier_ops = {
 	.boot = mcctrl_os_boot_notifier,
 	.shutdown = mcctrl_os_shutdown_notifier,

executer/kernel/mcctrl/mcctrl.h

@@ -408,6 +408,8 @@ inline struct mcctrl_per_thread_data *mcctrl_get_per_thread_data(
 void __return_syscall(ihk_os_t os, struct ikc_scd_packet *packet, 
 		long ret, int stid);
 
+int mcctrl_os_alive(void);
+
 #define PROCFS_NAME_MAX 768
 
 struct procfs_read {