diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/uaccess.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/uaccess.c | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/uaccess.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/uaccess.c deleted file mode 100644 index 2fe5f5f87c..0000000000 --- a/target/linux/ubicom32/files/arch/ubicom32/kernel/uaccess.c +++ /dev/null @@ -1,109 +0,0 @@ -/* - * arch/ubicom32/include/asm/uaccess.c - * User space memory access functions for Ubicom32 architecture. - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port is free software: you can redistribute - * it and/or modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, either version 2 of the - * License, or (at your option) any later version. - * - * The Ubicom32 Linux Kernel Port 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. - * - * You should have received a copy of the GNU General Public License - * along with the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/string.h> -#include <linux/module.h> - -#include <asm/segment.h> -#include <asm/uaccess.h> - -extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end; - -/* - * __access_ok() - * Check that the address is in the current processes. - * - * NOTE: The kernel uses "pretend" user addresses that wind - * up calling access_ok() so this approach has only marginal - * value because you wind up with lots of false positives. - */ -int __access_ok(unsigned long addr, unsigned long size) -{ - // struct vm_area_struct *vma; - - /* - * Don't do anything if we are not a running system yet. - */ - if (system_state != SYSTEM_RUNNING) { - return 1; - } - - /* - * It appears that Linux will call this function even when we are not - * in the context of a user space application that has a VM address - * space. So we must check that current and mm are valid before - * performing the check. - */ - if ((!current) || (!current->mm)) { - return 1; - } - - /* - * We perform some basic checks on the address to ensure that it - * is at least within the range of DRAM. - */ - if ((addr < (int)&_etext) || (addr > memory_end)) { - printk(KERN_WARNING "pid=%d[%s]: range [%lx - %lx] not in memory area: [%lx - %lx]\n", - current->pid, current->comm, - addr, addr + size, - memory_start, memory_end); - return 0; - } - - /* - * For nommu Linux we can check this by looking at the allowed - * memory map for the process. - * - * TODO: Since the kernel passes addresses in it's own space as though - * they were user address, we can not validate the addresses this way. - */ -#if 0 - if (!down_read_trylock(¤t->mm->mmap_sem)) { - return 1; - } - vma = find_vma(current->mm, addr); - if (!vma) { - up_read(¤t->mm->mmap_sem); - printk(KERN_WARNING "pid=%d[%s]: possible invalid acesss on range: [%lx - %lx]\n", - current->pid, current->comm, addr, addr + size); - return 1; - } - if ((addr + size) > vma->vm_end) { - up_read(¤t->mm->mmap_sem); - printk(KERN_WARNING "pid=%d[%s]: possible invalid length on range: [%lx - %lx]\n", - current->pid, current->comm, addr, addr + size); - return 1; - } - up_read(¤t->mm->mmap_sem); -#endif - return 1; -} - -EXPORT_SYMBOL(__access_ok); |