/usr/ is in ruby-whitewash 2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ruby-whitewash/
/usr/share/
/usr/share/ruby-whitewash/whitelist.yaml
/usr/share/ruby-whitewash/html5_whitelist.yaml
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/whitewash-2.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-whitewash/
/usr/share/doc/ruby-whitewash/README.rdoc
/usr/share/doc/ruby-whitewash/copyright
/usr/share/doc/ruby-whitewash/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/whitewash.rb