1 /*
2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
3  *
4  *   This program is free software; you can redistribute it and/or
5  *   modify it under the terms of the GNU General Public License
6  *   as published by the Free Software Foundation, version 2.
7  *
8  *   This program is distributed in the hope that it will be useful, but
9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11  *   NON INFRINGEMENT.  See the GNU General Public License for
12  *   more details.
13  */
14 
15 #include <linux/uaccess.h>
16 #include <linux/module.h>
17 
__range_ok(unsigned long addr,unsigned long size)18 int __range_ok(unsigned long addr, unsigned long size)
19 {
20 	unsigned long limit = current_thread_info()->addr_limit.seg;
21 	return !((addr < limit && size <= limit - addr) ||
22 		 is_arch_mappable_range(addr, size));
23 }
24 EXPORT_SYMBOL(__range_ok);
25 
26 #ifdef CONFIG_DEBUG_COPY_FROM_USER
copy_from_user_overflow(void)27 void copy_from_user_overflow(void)
28 {
29        WARN(1, "Buffer overflow detected!\n");
30 }
31 EXPORT_SYMBOL(copy_from_user_overflow);
32 #endif
33