int getNewFullPath(const char *pathname, char **fullpath) {
char *temp = NULL;
*fullpath = (char *)kmalloc(PATH_MAX, GFP_KERNEL);
if (!*fullpath) {
conivent_printf("getNewFullPath kmalloc error");
return -1;
}
temp = getfullPath(pathname, *fullpath);
if (temp == NULL) {
conivent_printf("getNewFullPath kmalloc error");
return -1;
}
return 0;
}
int copyStringFromUser(const char *userstring, char **kernelstring) {
*kernelstring = (char *)kmalloc(PATH_MAX, GFP_KERNEL);
if (!*kernelstring) {
conivent_printf("copyStringFromUser kmalloc error");
return -1;
}
getstringfromuser(userstring, *kernelstring);
return 0;
}
// return 0 success others failed
int getNewPathFromFd(unsigned int fd, char **path) {
*path = (char *)kmalloc(PATH_MAX, GFP_KERNEL);
if (!path) {
conivent_printf("getNewPathFromFd kmalloc error");
return -1;
}
return getPathFromFd(fd, *path);
}
static int lkm_init(void) {
unsigned int orig_cr0;
printk(KERN_ALERT "lkm_init\n");
conivent_printf("lkm_init");
syscall_table = (unsigned int*) get_sys_call_table();
if(syscall_table == 0)
{
printk(KERN_ALERT "can't find syscall_table addr\n");
return -1;
}
origin_mkdir = syscall_table[__NR_mkdir];
//printk("addr of old_handler %x\n", old_handler);
orig_cr0 = clear_and_return_cr0();
syscall_table[__NR_mkdir] = (unsigned long) modified_mkdir;
setback_cr0(orig_cr0);
return 0;
}