airootfs/etc/pam.d/su

   1
   2 #%PAM-1.0
   3 auth            sufficient      pam_rootok.so
   4 auth            sufficient      pam_wheel.so trust use_uid
   5 auth            required        pam_unix.so
   6 account         required        pam_unix.so
   7 session required pam_unix.so