/usr/lib/ldap/back_null.so

This file is indexed.

/usr/lib/ldap/back_null.so is in slapd 2.4.42+dfsg-2ubuntu3.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/ldap/back_null-2.4.so.2.10.5