test/ruby/test_symbol.rb: new test for nondeterminism

We need to ensure hashes for static symbols remain
non-deterministic to avoid DoS attacks.   This is currently the
case since 2.4+, but was not for the 2.3 series.

* test/ruby/test_symbol.rb (test_hash_nondeterministic): new test
  [ruby-core:80430] [Bug #13376]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58200 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
index 42b5106298..39b2c7692a 100644
--- a/test/ruby/test_symbol.rb
+++ b/test/ruby/test_symbol.rb
@@ -500,4 +500,14 @@ class TestSymbol < Test::Unit::TestCase
     assert_equal str, str.to_sym.to_s
     assert_not_predicate(str, :frozen?, bug11721)
   end
+
+  def test_hash_nondeterministic
+    ruby = EnvUtil.rubybin
+    refute_equal `#{ruby} -e 'puts :foo.hash'`, `#{ruby} -e 'puts :foo.hash'`,
+                 '[ruby-core:80430] [Bug #13376]'
+
+    sym = "dynsym_#{Random.rand(10000)}_#{Time.now}"
+    refute_equal `#{ruby} -e 'puts #{sym.inspect}.to_sym.hash'`,
+                 `#{ruby} -e 'puts #{sym.inspect}.to_sym.hash'`
+  end
 end