diff options
| -rw-r--r-- | sys/include/sys/system.h | 40 | ||||
| -rw-r--r-- | sys/kern/kern_subr.c | 95 |
2 files changed, 135 insertions, 0 deletions
diff --git a/sys/include/sys/system.h b/sys/include/sys/system.h new file mode 100644 index 0000000..77a6337 --- /dev/null +++ b/sys/include/sys/system.h @@ -0,0 +1,40 @@ +/* + * 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. + */ + +#ifndef _SYS_SYSTEM_H_ +#define _SYS_SYSTEM_H_ + +#include <sys/types.h> + +#if defined(_KERNEL) +int copyin(uintptr_t uaddr, void *kaddr, size_t len); +int copyout(const void *kaddr, uintptr_t uaddr, size_t len); +#endif + +#endif /* !_SYS_SYSTEM_H_ */ diff --git a/sys/kern/kern_subr.c b/sys/kern/kern_subr.c new file mode 100644 index 0000000..dd1a618 --- /dev/null +++ b/sys/kern/kern_subr.c @@ -0,0 +1,95 @@ +/* + * 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; +} |