/usr/lib/ruby/vendor_ruby/ is in ruby-ffi-yajl 2.3.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/ffi_yajl/
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/MIT-LICENSE
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/encode.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/encode_json_and_marshal.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/encode_json_and_yaml.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/encode_profile.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/http.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse_json_and_marshal.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse_json_and_yaml.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse_profile.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse_profile_ruby_prof.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/parse_stream.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/item.json
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/ohai.json
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/ohai.marshal_dump
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/ohai.yml
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/twitter_search.json
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/twitter_stream.json
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark/subjects/unicode.json
/usr/lib/ruby/vendor_ruby/ffi_yajl/benchmark.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/encoder.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/ext.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/ffi/
/usr/lib/ruby/vendor_ruby/ffi_yajl/ffi/encoder.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/ffi/parser.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/ffi.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/map_library_name.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/parser.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/platform.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl/version.rb
/usr/lib/ruby/vendor_ruby/ffi_yajl.rb
/usr/lib/ruby/vendor_ruby/libyajl2.rb