/usr/lib/ruby/vendor_ruby/ is in ruby-fog-local 0.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/fog/
/usr/lib/ruby/vendor_ruby/fog/local/
/usr/lib/ruby/vendor_ruby/fog/local/storage.rb
/usr/lib/ruby/vendor_ruby/fog/local/version.rb
/usr/lib/ruby/vendor_ruby/fog/local.rb
/usr/lib/ruby/vendor_ruby/fog/bin/
/usr/lib/ruby/vendor_ruby/fog/bin/local.rb
/usr/lib/ruby/vendor_ruby/fog/storage/
/usr/lib/ruby/vendor_ruby/fog/storage/local/
/usr/lib/ruby/vendor_ruby/fog/storage/local/models/
/usr/lib/ruby/vendor_ruby/fog/storage/local/models/file.rb
/usr/lib/ruby/vendor_ruby/fog/storage/local/models/files.rb
/usr/lib/ruby/vendor_ruby/fog/storage/local/models/directory.rb
/usr/lib/ruby/vendor_ruby/fog/storage/local/models/directories.rb
/usr/lib/ruby/vendor_ruby/fog/storage/local.rb