Require root to run.

Signed-off-by: CAI Qian <caiqian@redhat.com>
diff --git a/testcases/kernel/mem/oom/oom02.c b/testcases/kernel/mem/oom/oom02.c
index 4a956f6..24cfe51 100644
--- a/testcases/kernel/mem/oom/oom02.c
+++ b/testcases/kernel/mem/oom/oom02.c
@@ -88,6 +88,8 @@
 {
 	int fd;
 
+	tst_require_root(NULL);
+
 	tst_sig(FORK, DEF_HANDLER, cleanup);
 	TEST_PAUSE;