1 files changed, 21 insertions, 0 deletions

diff --git a/tests/vm/mmap-over-data.c b/tests/vm/mmap-over-data.c
new file mode 100644
index 0000000..9ea5d49
--- /dev/null
+++ b/tests/vm/mmap-over-data.c
@@ -0,0 +1,21 @@
+/* Verifies that mapping over the data segment is disallowed. */
+
+#include <stdint.h>
+#include <round.h>
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+static char x;
+
+void
+test_main (void) 
+{
+  uintptr_t x_page = ROUND_DOWN ((uintptr_t) &x, 4096);
+  int handle;
+  
+  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
+  CHECK (mmap (handle, (void *) x_page) == MAP_FAILED,
+         "try to mmap over data segment");
+}
+