release/src-rt-6.x.4708/linux/linux-2.6.36/arch/tile/lib/uaccess.c

   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
  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
  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