LXR linux/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
  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