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src/tests/vm/mmap-zero.c

+/* Tries to map a zero-length file, which may or may not work but
+   should not terminate the process or crash.
+   Then dereferences the address that we tried to map,
+   and the process must be terminated with -1 exit code. */
+
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void) 
+{
+  char *data = (char *) 0x7f000000;
+  int handle;
+
+  CHECK (create ("empty", 0), "create empty file \"empty\"");
+  CHECK ((handle = open ("empty")) > 1, "open \"empty\"");
+
+  /* Calling mmap() might succeed or fail.  We don't care. */
+  msg ("mmap \"empty\"");
+  mmap (handle, data);
+
+  /* Regardless of whether the call worked, *data should cause
+     the process to be terminated. */
+  fail ("unmapped memory is readable (%d)", *data);
+}
+