Index: sys/kern/vfs_lookup.c
===================================================================
--- sys/kern/vfs_lookup.c
+++ sys/kern/vfs_lookup.c
@@ -1423,6 +1423,12 @@
 		return (0);
 	}
 
+	/* Do nothing when chrooted or jailed. */
+	if (td->td_proc->p_fd->fd_rdir != rootvnode) {
+		bcopy(ptr, buf, len);
+		return (0);
+	}
+
 	/*
 	 * We know that there is a / somewhere in this pathname.
 	 * Search backwards for it, to find the file's parent dir