Why can't change root passwd with single mode on Red Hat Enterprise Linux 6?

Issue

Why can't change root passwd with single mode on Red Hat Enterprise Linux 6?

Environment

Red Hat Enterprise Linux 6

Root Cause

This may be caused, in part my SELinux. SELinux may be enforced with SELinux boolean. Use getsebool to check SELinux boolean value:

#getenforce
Enforcing

Resolution

Please set the se...