| 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; |
| } |