From: Run Paint Run Run <redmine@...>
Date: 2009-07-06T00:31:57+09:00
Subject: [ruby-core:24152] [Bug #1732] Inconsistency in Transference of Inherited Traits ('Tainted' and 'Untrusted') with #join

Bug #1732: Inconsistency in Transference of Inherited Traits ('Tainted' and 'Untrusted') with #join
http://redmine.ruby-lang.org/issues/show/1732

Author: Run Paint Run Run
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.2dev (2009-07-05 trunk 23958) [i686-linux]

Array#join transfers self's taintedness and trustworthiness to its return value. If an Array is tainted, so is the concatenation of its elements:

  >> ['a'].taint.join.tainted?
  => true
  >> ['a'].untrust.join.untrusted?
  => true

However, other Enumerables with #join methods do not pass said traits to their offspring:

  >> {'a' => 'b'}.taint.join.tainted?
  => false
  >> {'a' => 'b'}.untrust.join.untrusted?
  => false

  >> require 'set'
  => true
  >> Set.new(['a','b']).taint.join.tainted?
  => false
  >> Set.new(['a','b']).untrust.join.untrusted?
  => false

  >> class E; include Enumerable; def initialize(*a); @e=a; end; def each; @e.each{|e| yield e}; end; end
  => nil
  >> E.new('a','b').taint.join.tainted?
  => false
  >> E.new('a','b').untrust.join.untrusted?
  => false


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