From c7582e845a45728a072bee2c321256a09d30e3b3 Mon Sep 17 00:00:00 2001
From: h2-addad <hamza2.addad@live.uwe.ac.uk>
Date: Sun, 16 Jul 2023 15:20:42 +0000
Subject: [PATCH] Upload New File
---
src/tests/vm/mmap-zero.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
create mode 100644 src/tests/vm/mmap-zero.c
diff --git a/src/tests/vm/mmap-zero.c b/src/tests/vm/mmap-zero.c
new file mode 100644
index 0000000..368b759
--- /dev/null
+++ b/src/tests/vm/mmap-zero.c
@@ -0,0 +1,27 @@
+/* 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);
+}
+
--
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