#include <linux/seq_file.h>
#include <linux/user_namespace.h>
#include <linux/nsfs.h>
+#include <linux/uaccess.h>
static struct vfsmount *nsfs_mnt;
static long ns_ioctl(struct file *filp, unsigned int ioctl,
unsigned long arg)
{
+ struct user_namespace *user_ns;
struct ns_common *ns = get_proc_ns(file_inode(filp));
+ uid_t __user *argp;
+ uid_t uid;
switch (ioctl) {
case NS_GET_USERNS:
if (!ns->ops->get_parent)
return -EINVAL;
return open_related_ns(ns, ns->ops->get_parent);
+ case NS_GET_NSTYPE:
+ return ns->ops->type;
+ case NS_GET_OWNER_UID:
+ if (ns->ops->type != CLONE_NEWUSER)
+ return -EINVAL;
+ user_ns = container_of(ns, struct user_namespace, ns);
+ argp = (uid_t __user *) arg;
+ uid = from_kuid_munged(current_user_ns(), user_ns->owner);
+ return put_user(uid, argp);
default:
return -ENOTTY;
}