/usr/lib/ruby/vendor_ruby/ is in chef-expander 10.12.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/chef/
/usr/lib/ruby/vendor_ruby/chef/expander/
/usr/lib/ruby/vendor_ruby/chef/expander/solrizer.rb
/usr/lib/ruby/vendor_ruby/chef/expander/daemonizable.rb
/usr/lib/ruby/vendor_ruby/chef/expander/vnode.rb
/usr/lib/ruby/vendor_ruby/chef/expander/vnode_table.rb
/usr/lib/ruby/vendor_ruby/chef/expander/control.rb
/usr/lib/ruby/vendor_ruby/chef/expander/vnode_supervisor.rb
/usr/lib/ruby/vendor_ruby/chef/expander/node.rb
/usr/lib/ruby/vendor_ruby/chef/expander/logger.rb
/usr/lib/ruby/vendor_ruby/chef/expander/cluster_supervisor.rb
/usr/lib/ruby/vendor_ruby/chef/expander/flattener.rb
/usr/lib/ruby/vendor_ruby/chef/expander/loggable.rb
/usr/lib/ruby/vendor_ruby/chef/expander/version.rb
/usr/lib/ruby/vendor_ruby/chef/expander/configuration.rb
/usr/lib/ruby/vendor_ruby/chef/expander.rb