Solaris 11.2 single-user mode doesn't require root password anymore
Well, I haven't noticed if Solaris 11.1 exhibits the same behavior of if it's new in Solaris 11.2.
While booting into single-user mode (-s) (Maintenance Mode) the "Enter user name for system maintenance (control-d to bypass):" prompt accepts a local user.
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Booting to milestone "milestone/single-user:default".
Hostname: baseline-general
Requesting System Maintenance Mode
SINGLE USER MODE
Enter user name for system maintenance (control-d to bypass): admin1
Enter admin1 password (control-d to bypass):
Right after entering a local user password the following messages are printed:
single-user privilege assigned to admin1 on /dev/console