/usr/ is in ruby-rails-html-sanitizer 1.0.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/rails/html/sanitizer/
/usr/lib/ruby/vendor_ruby/rails/html/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rails/
/usr/lib/ruby/vendor_ruby/rails/html/sanitizer/version.rb
/usr/lib/ruby/vendor_ruby/rails/html/sanitizer.rb
/usr/lib/ruby/vendor_ruby/rails/html/scrubbers.rb
/usr/lib/ruby/vendor_ruby/rails-html-sanitizer.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rails-html-sanitizer/
/usr/share/doc/ruby-rails-html-sanitizer/README.md
/usr/share/doc/ruby-rails-html-sanitizer/changelog.Debian.gz
/usr/share/doc/ruby-rails-html-sanitizer/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rails-html-sanitizer-1.0.4.gemspec