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ukl.c
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/*
* ukl.c
*
* Copyright (C) 2018, Ali Raza <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/ukl.h>
// int dataCounter = 0;
// struct recvstruct
// {
// int fd;
// void __user *ubuf;
// size_t size;
// unsigned int flags;
// struct sockaddr __user *addr;
// int __user *addr_len;
// };
// struct recvstruct *data;
ssize_t ukl_write(int fd, const void* buf, size_t count) {
if(count == -1)
count = strlen(buf);
return ksys_write(fd, buf, count);
}
ssize_t ukl_read(int fd, const void* buf, size_t count){
return ksys_read(fd, buf, count);
}
long ukl_open(char *filename){
long fd;
fd = do_sys_open(AT_FDCWD, filename, O_WRONLY | O_CREAT,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
return fd;
}
long ukl_close(int fd){
int retval = __close_fd(current->files, fd);
return retval;
}
void * ukl_malloc(size_t size){
// taken form slab.h kmalloc implementation
// return __kmalloc(size, GFP_KERNEL);
return vmalloc(size);
}
int ukl_utsname(struct new_utsname *name){ //in /kernel/sys.c
//int errno = 0;
struct new_utsname *kname;
kname = utsname();
memcpy(name, kname, sizeof(struct new_utsname));
return 0;
}
int ukl_exit_group(int error_code){
ssize_t msg;
msg = ukl_write(1, "Process exited, now idling!\n", -1);
while(1){
}
// if I dont call the loop here, kernel will go into panic because I attempt to
// kill init
do_group_exit((error_code & 0xff) << 8);
}
int ukl_socket(int family, int type, int protocol){
return __sys_socket(family, type, protocol);
}
int ukl_bind(int fd, struct sockaddr __user *umyaddr, int addrlen){
return __sys_bind(fd, umyaddr, addrlen);
}
int ukl_connect(int fd, struct sockaddr __user *uservaddr, int addrlen){
return __sys_connect(fd, uservaddr, addrlen);
}
int ukl_listen(int fd, int backlog){
return __sys_listen(fd, backlog);
}
int ukl_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen){
return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
}
int ukl_ioctl(int fd, int cmd, long arg){
return ksys_ioctl(fd, cmd, arg);
}
int ukl_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, struct sockaddr __user *addr, int __user *addr_len){
return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
}
int ukl_sendto(int fd, void *buff, size_t len, unsigned int flags, struct sockaddr *addr, int addr_len){
return __sys_sendto(fd, buff, len, flags, addr, addr_len);
}
int ukl_recv(int fd, void __user *ubuf, size_t size, unsigned int flags, struct sockaddr __user *addr, int __user *addr_len){
return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
}
int ukl_send(int fd, void *buff, size_t len, unsigned int flags, struct sockaddr *addr, int addr_len){
return __sys_sendto(fd, buff, len, flags, NULL, 0);
}
int ukl_setsockopt(int fd, int level, int optname, char *optval, int optlen){
return __sys_setsockopt(fd, level, optname, optval, optlen);
}
long ukl_arch_prctl(int option, unsigned long arg2){
long ret;
ret = do_arch_prctl_64(current, option, arg2);
if (ret == -EINVAL)
ret = do_arch_prctl_common(current, option, arg2);
return ret;
}
int ukl_get_thread_area(struct user_desc __user *u_info){
return do_get_thread_area(current, -1, u_info);
}
int ukl_set_thread_area(struct user_desc __user *u_info){
return do_set_thread_area(current, -1, u_info, 1);
}
long ukl_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long off){
long error;
error = -EINVAL;
if (off & ~PAGE_MASK)
goto out;
error = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
out:
return error;
}
// int ukl_uname(struct old_utsname * name){
// struct old_utsname tmp;
// if (!name)
// return -EFAULT;
// down_read(&uts_sem);
// memcpy(&tmp, utsname(), sizeof(tmp));
// up_read(&uts_sem);
// if (copy_to_user(name, &tmp, sizeof(tmp)))
// return -EFAULT;
// if (override_release(name->release, sizeof(name->release)))
// return -EFAULT;
// if (override_architecture(name))
// return -EFAULT;
// return 0;
// }
pid_t ukl_set_tid_address(int * tidptr){
current->clear_child_tid = tidptr;
return task_pid_vnr(current);
}
int ukl_set_robust_list(struct robust_list_head * head, size_t len){
if (!futex_cmpxchg_enabled)
return -ENOSYS;
/*
* The kernel knows only one size for now:
*/
if (unlikely(len != sizeof(*head)))
return -EINVAL;
current->robust_list = head;
return 0;
}
int ukl_rt_sigaction(int sig, const struct sigaction * act, struct sigaction * oact, size_t sigsetsize){
struct k_sigaction new_sa, old_sa;
int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (act && copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
return -EFAULT;
ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
if (ret)
return ret;
if (oact && copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
return -EFAULT;
return 0;
}
int ukl_rt_sigprocmask(int how, sigset_t * nset, sigset_t * oset, size_t sigsetsize){
sigset_t old_set, new_set;
int error;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
old_set = current->blocked;
if (nset) {
if (copy_from_user(&new_set, nset, sizeof(sigset_t)))
return -EFAULT;
sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
error = sigprocmask(how, &new_set, NULL);
if (error)
return error;
}
if (oset) {
if (copy_to_user(oset, &old_set, sizeof(sigset_t)))
return -EFAULT;
}
return 0;
}
int ukl_prlimit64(pid_t pid, unsigned int resource, const struct rlimit64 * new_rlim, struct rlimit64 * old_rlim){
struct rlimit64 old64, new64;
struct rlimit old, new;
struct task_struct *tsk;
unsigned int checkflags = 0;
int ret;
if (old_rlim)
checkflags |= LSM_PRLIMIT_READ;
if (new_rlim) {
if (copy_from_user(&new64, new_rlim, sizeof(new64)))
return -EFAULT;
rlim64_to_rlim(&new64, &new);
checkflags |= LSM_PRLIMIT_WRITE;
}
rcu_read_lock();
tsk = pid ? find_task_by_vpid(pid) : current;
if (!tsk) {
rcu_read_unlock();
return -ESRCH;
}
ret = check_prlimit_permission(tsk, checkflags);
if (ret) {
rcu_read_unlock();
return ret;
}
get_task_struct(tsk);
rcu_read_unlock();
ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL,
old_rlim ? &old : NULL);
if (!ret && old_rlim) {
rlim_to_rlim64(&old, &old64);
if (copy_to_user(old_rlim, &old64, sizeof(old64)))
ret = -EFAULT;
}
put_task_struct(tsk);
return ret;
}
unsigned long ukl_brk(unsigned long brk){
return mybrk(brk);
}
int ukl_fstat(unsigned int fd, struct stat __user * statbuf){
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_new_stat(&stat, statbuf);
return error;
}
int ukl_mprotect(unsigned long start, size_t len, unsigned long prot){
return do_mprotect_pkey(start, len, prot, -1);
}
long ukl_clone(unsigned long clone_flags, unsigned long newsp, int * parent_tidptr, unsigned long tls, int * child_tidptr){
return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr, tls);
}
int ukl_munmap(unsigned long addr, size_t len){
return 0;
}
// int ukl_accept4(int fd, struct sockaddr __user * upeer_sockaddr, int __user * upeer_addrlen, int flags);
// {
// return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
// }
// long access(const char __user * filename, int mode)
// {
// return do_faccessat(AT_FDCWD, filename, mode);
// }
// unsigned long ukl_adjtimex(struct timex __user * txc_p)
// {
// struct timex txc; /* Local copy of parameter */
// int ret;
// /* Copy the user data space into the kernel copy
// * structure. But bear in mind that the structures
// * may change
// */
// if (copy_from_user(&txc, txc_p, sizeof(struct timex)))
// return -EFAULT;
// ret = do_adjtimex(&txc);
// return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
// }