patches.pramfs/15-pramfs-test-module.patch

From ltsi-dev-bounces@lists.linuxfoundation.org Sat May 12 10:19:02 2012
From: Marco Stornelli <marco.stornelli@gmail.com>
Date: Sat, 12 May 2012 19:12:29 +0200
Subject: pramfs: test module
To: LTSI <ltsi-dev@lists.linuxfoundation.org>
Message-ID: <4FAE99FD.4040508@gmail.com>


From: Marco Stornelli <marco.stornelli@gmail.com>

Test module.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>

---
 fs/pramfs/pramfs_test.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

--- /dev/null
+++ b/fs/pramfs/pramfs_test.c
@@ -0,0 +1,47 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Pramfs test module.
+ *
+ * Copyright 2009-2011 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include "pram.h"
+
+int __init test_pramfs_write(void)
+{
+	struct pram_super_block *psb;
+
+	psb = get_pram_super();
+	if (!psb) {
+		printk(KERN_ERR
+			"%s: PRAMFS super block not found (not mounted?)\n",
+			__func__);
+		return 1;
+	}
+
+	/*
+	 * Attempt an unprotected clear of checksum information in the
+	 * superblock, this should cause a kernel page protection fault.
+	 */
+	printk("%s: writing to kernel VA %p\n", __func__, psb);
+	psb->s_sum = 0;
+
+	return 0;
+}
+
+void test_pramfs_write_cleanup(void) {}
+
+/* Module information */
+MODULE_LICENSE("GPL");
+module_init(test_pramfs_write);
+module_exit(test_pramfs_write_cleanup);