apparmor: fix disconnected bind mnts reconnection

commit f2e561d1 upstream.

Bind mounts can fail to be properly reconnected when PATH_CONNECT is
specified. Ensure that when PATH_CONNECT is specified the path has
a root.

BugLink: http://bugs.launchpad.net/bugs/1319984Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>

security/apparmor/path.c

@@ -141,7 +141,10 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
 			error = -EACCES;
 			if (*res == '/')
 				*name = res + 1;
-		}
+		} else if (*res != '/')
+			/* CONNECT_PATH with missing root */
+			error = prepend(name, *name - buf, "/", 1);
+
 	}
 
 out: