/usr/lib/ruby/vendor_ruby/ is in kwalify 0.7.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/kwalify/
/usr/lib/ruby/vendor_ruby/kwalify/errors.rb
/usr/lib/ruby/vendor_ruby/kwalify/kwalify.schema.yaml
/usr/lib/ruby/vendor_ruby/kwalify/main.rb
/usr/lib/ruby/vendor_ruby/kwalify/messages.rb
/usr/lib/ruby/vendor_ruby/kwalify/meta-validator.rb
/usr/lib/ruby/vendor_ruby/kwalify/parser/
/usr/lib/ruby/vendor_ruby/kwalify/parser/base.rb
/usr/lib/ruby/vendor_ruby/kwalify/parser/yaml.rb
/usr/lib/ruby/vendor_ruby/kwalify/rule.rb
/usr/lib/ruby/vendor_ruby/kwalify/templates/
/usr/lib/ruby/vendor_ruby/kwalify/templates/genclass-java.eruby
/usr/lib/ruby/vendor_ruby/kwalify/templates/genclass-php.eruby
/usr/lib/ruby/vendor_ruby/kwalify/templates/genclass-ruby.eruby
/usr/lib/ruby/vendor_ruby/kwalify/types.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/
/usr/lib/ruby/vendor_ruby/kwalify/util/assert-text-equal.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/hash-interface.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/hashlike.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/option-parser.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/ordered-hash.rb
/usr/lib/ruby/vendor_ruby/kwalify/util/testcase-helper.rb
/usr/lib/ruby/vendor_ruby/kwalify/util.rb
/usr/lib/ruby/vendor_ruby/kwalify/validator.rb
/usr/lib/ruby/vendor_ruby/kwalify/yaml-parser.rb
/usr/lib/ruby/vendor_ruby/kwalify.rb