pramfs: test module

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+/*
+ * BRIEF DESCRIPTION
+ *
+ * Pramfs test module.
+ *
+ * Copyright 2009-2010 Marco Stornelli <[email protected]>
+ * 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);