Вывод команды w

     UsePrivilegeSeparation
             Specifies whether sshd(8) separates privileges by creating an
             unprivileged child process to deal with incoming network traffic.
             After successful authentication, another process will be created
             that has the privilege of the authenticated user.  The goal of
             privilege separation is to prevent privilege escalation by con‐
             taining any corruption within the unprivileged processes.  The
             default is “yes”.