0,0 → 1,125 |
/* |
* Copyright (C) 2006 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** |
* @file copy.c |
* @brief Copying between kernel and userspace. |
* |
* This file contains sanitized functions for copying data |
* between kernel and userspace. |
*/ |
|
#include <syscall/copy.h> |
#include <proc/thread.h> |
#include <mm/as.h> |
#include <macros.h> |
#include <arch.h> |
#include <errno.h> |
#include <typedefs.h> |
|
/** Copy data from userspace to kernel. |
* |
* Provisions are made to return value even after page fault. |
* |
* This function can be called only from syscall. |
* |
* @param dst Destination kernel address. |
* @param uspace_src Source userspace address. |
* @param size Size of the data to be copied. |
* |
* @return 0 on success or error code from @ref errno.h. |
*/ |
int copy_from_uspace(void *dst, void *uspace_src, size_t size) |
{ |
ipl_t ipl; |
int rc; |
|
ASSERT(THREAD); |
ASSERT(!THREAD->in_copy_from_uspace); |
|
if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
if (overlaps((__address) uspace_src, size, |
KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
/* |
* The userspace source block conflicts with kernel address space. |
*/ |
return EPERM; |
} |
} |
|
ipl = interrupts_disable(); |
THREAD->in_copy_from_uspace = true; |
|
rc = memcpy_from_uspace(dst, uspace_src, size); |
|
THREAD->in_copy_from_uspace = false; |
|
interrupts_restore(ipl); |
return !rc ? EPERM : 0; |
} |
|
/** Copy data from kernel to userspace. |
* |
* Provisions are made to return value even after page fault. |
* |
* This function can be called only from syscall. |
* |
* @param uspace_dst Destination userspace address. |
* @param uspace_src Source kernel address. |
* @param size Size of the data to be copied. |
* |
* @return 0 on success or error code from @ref errno.h. |
*/ |
int copy_to_uspace(void *uspace_dst, void *src, size_t size) |
{ |
ipl_t ipl; |
int rc; |
|
ASSERT(THREAD); |
ASSERT(!THREAD->in_copy_from_uspace); |
|
if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
if (overlaps((__address) uspace_dst, size, |
KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
/* |
* The userspace destination block conflicts with kernel address space. |
*/ |
return EPERM; |
} |
} |
|
ipl = interrupts_disable(); |
THREAD->in_copy_from_uspace = true; |
|
rc = memcpy_to_uspace(uspace_dst, src, size); |
|
THREAD->in_copy_from_uspace = false; |
|
interrupts_restore(ipl); |
return !rc ? EPERM : 0; |
} |