This file is indexed.

/etc/pam.d/runuser is in util-linux 2.25.2-6.

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		sufficient	pam_rootok.so
session		optional	pam_keyinit.so revoke
session		required	pam_limits.so
session		required	pam_unix.so