LAB 4 IS DONE.

lab/user/buggyhello2.c

@@ -0,0 +1,13 @@
+// buggy hello world 2 -- pointed-to region extends into unmapped memory
+// kernel should destroy user environment in response
+
+#include <inc/lib.h>
+
+const char *hello = "hello, world\n";
+
+void
+umain(int argc, char **argv)
+{
+	sys_cputs(hello, 1024*1024);
+}
+