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 18int __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} 24EXPORT_SYMBOL(__range_ok); 25 26#ifdef CONFIG_DEBUG_COPY_FROM_USER 27void copy_from_user_overflow(void) 28{ 29 WARN(1, "Buffer overflow detected!\n"); 30} 31EXPORT_SYMBOL(copy_from_user_overflow); 32#endif 33