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Subject[PATCH 15/17] pramfs: test module
From: Marco Stornelli <marco.stornelli@gmail.com>
Subject: Pramfs test module

Test module.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
---
diff -Nurp linux-3.5-rc2-orig/fs/pramfs/pramfs_test.c linux-3.5-rc2/fs/pramfs/pramfs_test.c
--- linux-3.5-rc2-orig/fs/pramfs/pramfs_test.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-3.5-rc2/fs/pramfs/pramfs_test.c 2012-06-10 10:08:28.000000000 +0200
@@ -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);

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