[PATCH 15/17] pramfs: test module
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From: Marco Stornelli <hidden>
Date: 2012-06-10 09:23:17
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From: Marco Stornelli <redacted> Subject: Pramfs test module Test module. Signed-off-by: Marco Stornelli <redacted> --- 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);