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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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 the project 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/proc.h>
#include <sys/errno.h>
#include <os/systm.h>
#include <string.h>
/*
* Safe copy in function
*/
int
copyin(const void *uaddr, void *kaddr, size_t len)
{
struct proc *self = proc_self();
int error;
if (kaddr == NULL || uaddr == NULL) {
return -EINVAL;
}
if (len == 0) {
return -EINVAL;
}
if (self == NULL) {
return -EIO;
}
error = proc_check_addr(self, (uintptr_t)uaddr, len);
if (error < 0) {
return error;
}
memcpy(kaddr, uaddr, len);
return 0;
}
/*
* Safe copy out function
*/
int
copyout(const void *kaddr, void *uaddr, size_t len)
{
struct proc *self = proc_self();
int error;
if (kaddr == NULL || uaddr == NULL) {
return -EINVAL;
}
if (len == 0) {
return -EINVAL;
}
if (self == NULL) {
return -EIO;
}
error = proc_check_addr(self, (uintptr_t)uaddr, len);
if (error < 0) {
return error;
}
memcpy(uaddr, kaddr, len);
return 0;
}
int
copyinstr(const void *uaddr, char *kaddr, size_t len)
{
char *dest = (char *)kaddr;
const char *src = (char *)uaddr;
char dmmy;
if (copyin(uaddr, &dmmy, 1) != 0) {
return -EFAULT;
}
for (size_t i = 0; i < len; ++i) {
if (copyin(uaddr + i, &dmmy, 1) != 0) {
return -EFAULT;
}
dest[i] = src[i];
if (src[i] == '\0') {
break;
}
}
return 0;
}
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