* error.c (rb_check_trusted): new function to check an object is

trusted.
* struct.c (rb_struct_modify), time.c (time_modify): check by the
  above function to show proper class names.  [Bug #5036]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32569 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_struct.rb

@@ -1,5 +1,6 @@
 require 'test/unit'
 require 'timeout'
+require_relative 'envutil'
 
 class TestStruct < Test::Unit::TestCase
   def test_struct
@@ -249,4 +250,17 @@ class TestStruct < Test::Unit::TestCase
       assert !x.eql?(z)
     }
   end
+
+  def test_struct_subclass
+    bug5036 = '[ruby-dev:44122]'
+    st = Class.new(Struct)
+    s = st.new("S", :m).new
+    error = assert_raise(SecurityError) do
+      proc do
+        $SAFE = 4
+        s.m = 1
+      end.call
+    end
+    assert_equal("Insecure: can't modify #{st}::S", error.message, bug5036)
+  end
 end