This file is indexed.

/etc/pam.d/runuser-l is in util-linux 2.27.1-6ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#%PAM-1.0
auth		include		runuser
session		optional	pam_keyinit.so force revoke
-session	optional	pam_systemd.so
session		include		runuser