DL::dlopen in Ruby 1.8, 1.9.0, 1.9.2, 1.9.3, 2.0.0 before patchlevel 648, and 2.1 before 2.1.8 opens libraries with tainted names.
https://github.com/ruby/ruby/commit/4600cf725a86ce31266153647ae5aa1197b1215b
https://bugzilla.redhat.com/show_bug.cgi?id=1248935
https://access.redhat.com/errata/RHSA-2018:0583