Re: [PATCH v3 2/2] nsfs: Add an ioctl() to return owner UID of a userns

On Tue, Jan 17, 2017 at 02:03:29PM +1300, Michael Kerrisk (man-pages) wrote:

+	case NS_GET_OWNER_UID:
+		if (ns->ops->type != CLONE_NEWUSER)
+			return -EINVAL;
+		user_ns = container_of(ns, struct user_namespace, ns);
+		argp = (unsigned int __user *) arg;
+		uid = from_kuid_munged(current_user_ns(), user_ns->owner);
+		return put_user(uid, argp);
…
+/* Get owner UID for a user namespace */
+#define NS_GET_OWNER_UID	_IO(NSIO, 0x4)

The comment here should probably be:

  Get owner UID (in the current user namespace) for a user namespace

or some such, to convey that current_user_ns is being passed to
from_kuid_munged.

Cheers,
Trevor

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