buildroot/package/util-linux/su.pam

auth		sufficient	pam_rootok.so
auth		required	pam_wheel.so use_uid
auth		required	pam_env.so
auth		required	pam_unix.so nullok

account		required	pam_unix.so

password	required	pam_unix.so nullok

# session	required	pam_selinux.so close
session		required	pam_limits.so
session		required	pam_env.so
session		required	pam_unix.so
session		optional	pam_lastlog.so
# session	required	pam_selinux.so open