linux-imx

/*

 * Kernel module for testing copy_to/from_user infrastructure.

 *

 * Copyright 2013 Google Inc. All Rights Reserved

 *

 * Authors:

 *      Kees Cook       <keescook@chromium.org>

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/mman.h>

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/vmalloc.h>

​

/*

 * Several 32-bit architectures support 64-bit {get,put}_user() calls.

 * As there doesn't appear to be anything that can safely determine

 * their capability at compile-time, we just have to opt-out certain archs.

 */

#if BITS_PER_LONG == 64 || (!(defined(CONFIG_ARM) && !defined(MMU)) && \

                !defined(CONFIG_M68K) &&        \

                !defined(CONFIG_MICROBLAZE) &&  \

                !defined(CONFIG_NIOS2) &&       \

                !defined(CONFIG_PPC32) &&       \

                !defined(CONFIG_SUPERH))

# define TEST_U64

#endif

​

#define test(condition, msg)        \

({                  \

    int cond = (condition);     \

    if (cond)           \

        pr_warn("%s\n", msg);   \

    cond;               \

})

​

static int __init test_user_copy_init(void)

{

    int ret = 0;

    char *kmem;

    char __user *usermem;

    char *bad_usermem;

    unsigned long user_addr;

    u8 val_u8;

    u16 val_u16;

    u32 val_u32;

#ifdef TEST_U64

    u64 val_u64;

#endif

​