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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
#include <sys/system.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/sched.h>
#include <vm/vm.h>
#include <string.h>
/*
* Check if a user address is valid.
*
* @uaddr: User address to check.
*
* Returns true if valid, otherwise false.
*/
static bool
check_uaddr(uintptr_t uaddr)
{
struct proc *td = this_td();
struct vm_range exec_range = td->addr_range[ADDR_RANGE_EXEC];
struct vm_range stack_range = td->addr_range[ADDR_RANGE_STACK];
if (uaddr >= exec_range.start && uaddr <= exec_range.end) {
return true;
}
if (uaddr >= stack_range.start && uaddr <= stack_range.end) {
return true;
}
return false;
}
/*
* Copy from userspace to the kernel.
*
* @uaddr: Userspace address.
* @kaddr: Kernelspace address.
* @len: Length of data.
*/
int
copyin(uintptr_t uaddr, void *kaddr, size_t len)
{
if (!check_uaddr(uaddr) || !check_uaddr(uaddr + len)) {
return -EFAULT;
}
memcpy(kaddr, (void *)uaddr, len);
return 0;
}
/*
* Copy from the kernel to userspace.
*
* @kaddr: Kernelspace address.
* @uaddr: Userspace address.
* @len: Length of data.
*/
int
copyout(const void *kaddr, uintptr_t uaddr, size_t len)
{
if (!check_uaddr(uaddr) || !check_uaddr(uaddr + len)) {
return -EFAULT;
}
memcpy((void *)uaddr, kaddr, len);
return 0;
}
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