/usr/lib/ruby/vendor_ruby/ is in ruby-sass-rails 5.0.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/rails/
/usr/lib/ruby/vendor_ruby/rails/generators/
/usr/lib/ruby/vendor_ruby/rails/generators/sass/
/usr/lib/ruby/vendor_ruby/rails/generators/sass/assets/
/usr/lib/ruby/vendor_ruby/rails/generators/sass/assets/assets_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/sass/assets/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/sass/assets/templates/stylesheet.sass
/usr/lib/ruby/vendor_ruby/rails/generators/sass/scaffold/
/usr/lib/ruby/vendor_ruby/rails/generators/sass/scaffold/scaffold_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/sass_scaffold.rb
/usr/lib/ruby/vendor_ruby/rails/generators/scss/
/usr/lib/ruby/vendor_ruby/rails/generators/scss/assets/
/usr/lib/ruby/vendor_ruby/rails/generators/scss/assets/assets_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/scss/assets/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/scss/assets/templates/stylesheet.scss
/usr/lib/ruby/vendor_ruby/rails/generators/scss/scaffold/
/usr/lib/ruby/vendor_ruby/rails/generators/scss/scaffold/scaffold_generator.rb
/usr/lib/ruby/vendor_ruby/sass/
/usr/lib/ruby/vendor_ruby/sass/rails/
/usr/lib/ruby/vendor_ruby/sass/rails/cache_store.rb
/usr/lib/ruby/vendor_ruby/sass/rails/helpers.rb
/usr/lib/ruby/vendor_ruby/sass/rails/importer.rb
/usr/lib/ruby/vendor_ruby/sass/rails/logger.rb
/usr/lib/ruby/vendor_ruby/sass/rails/railtie.rb
/usr/lib/ruby/vendor_ruby/sass/rails/template.rb
/usr/lib/ruby/vendor_ruby/sass/rails/version.rb
/usr/lib/ruby/vendor_ruby/sass/rails.rb
/usr/lib/ruby/vendor_ruby/sass-rails.rb