From 9334597b11de6f792ef458ae88ff55f1415d64a7 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 1 Mar 2015 02:18:00 +0000
Subject: [PATCH] gc.c: hide internal objects

* gc.c (id2ref): prohibit from accessing internal objects.
  [ruby-core:68348] [Bug #10918]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 5 +++++
 gc.c      | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 5d8b46c31d..acee9ae225 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Mar  1 11:17:56 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* gc.c (id2ref): prohibit from accessing internal objects.
+	  [ruby-core:68348] [Bug #10918]
+
 Sun Mar  1 09:06:11 2015  Tanaka Akira  <akr@fsij.org>
 
 	* lib/time.rb (strptime): Support %s.%N.
diff --git a/gc.c b/gc.c
index c84da503ea..b843e7bb73 100644
--- a/gc.c
+++ b/gc.c
@@ -2761,6 +2761,9 @@ id2ref(VALUE obj, VALUE objid)
     if (!is_live_object(objspace, ptr)) {
 	rb_raise(rb_eRangeError, "%p is recycled object", p0);
     }
+    if (RBASIC(ptr)->klass == 0) {
+	rb_raise(rb_eRangeError, "%p is internal object", p0);
+    }
     return (VALUE)ptr;
 }