/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/ is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/aliasing.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/anonymous.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/attr_internal.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/attribute_accessors.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/delegation.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/deprecation.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/introspection.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/method_names.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/qualified_const.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/reachable.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/remove_method.rb
/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/synchronization.rb