Package: Busybox Version: v1.22.1 If the /etc/passwd (or shadow) entry for the user is empty, I invoke `sulogin' without arguments from an ordinary shell prompt, it prints `System Maintenance Mode', rather than to ask user for a password "Give root password for system maintenance (or type Control-D for normal startup)"
Here is a transcript: $ sulogin System Maintenance Mode $ /sbin/hello System Maintenance Mode $ I suggest that sulogin always ask user for a password even if /etc/passwd (or shadow) entry for the user is empty. Kernel version: Linux lrc-lsp-k2-a-0 3.10.47-rt50 #1 SMP PREEMPT RT Tue Dec 16 16:04:37 EET 2014 armv7l GNU/Linux Shared C library: libc-2.19-2014.04.so