From 092ff0c05a09d94fb59a305e21929caf0f76a285 Mon Sep 17 00:00:00 2001
From: h2-addad <hamza2.addad@live.uwe.ac.uk>
Date: Sun, 16 Jul 2023 15:17:29 +0000
Subject: [PATCH] Upload New File
---
src/tests/vm/mmap-overlap.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
create mode 100644 src/tests/vm/mmap-overlap.c
diff --git a/src/tests/vm/mmap-overlap.c b/src/tests/vm/mmap-overlap.c
new file mode 100644
index 0000000..668ae5f
--- /dev/null
+++ b/src/tests/vm/mmap-overlap.c
@@ -0,0 +1,20 @@
+/* Verifies that overlapping memory mappings are disallowed. */
+
+#include <syscall.h>
+#include "tests/vm/sample.inc"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+void
+test_main (void)
+{
+ char *start = (char *) 0x10000000;
+ int fd[2];
+
+ CHECK ((fd[0] = open ("zeros")) > 1, "open \"zeros\" once");
+ CHECK (mmap (fd[0], start) != MAP_FAILED, "mmap \"zeros\"");
+ CHECK ((fd[1] = open ("zeros")) > 1 && fd[0] != fd[1],
+ "open \"zeros\" again");
+ CHECK (mmap (fd[1], start + 4096) == MAP_FAILED,
+ "try to mmap \"zeros\" again");
+}
--
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