diff --git a/ChangeLog b/ChangeLog
index c6d531821e..84e96d3a3e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jun  4 10:46:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/dl/cfunc.c (rb_dlcfunc_inspect): should taint the result.
+	  [ruby-dev:41533]
+
 Fri Jun  4 09:37:15 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* gc.c (gc_sweep): suppress a warning on VC, again.
diff --git a/ext/dl/cfunc.c b/ext/dl/cfunc.c
index 38ff2cb8b1..536a7231a8 100644
--- a/ext/dl/cfunc.c
+++ b/ext/dl/cfunc.c
@@ -284,15 +284,18 @@ rb_dlcfunc_set_ptr(VALUE self, VALUE addr)
 static VALUE
 rb_dlcfunc_inspect(VALUE self)
 {
+    VALUE val;
     struct cfunc_data *cfunc;
 
     TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
 
-    return rb_sprintf("#<DL::CFunc:%p ptr=%p type=%d name='%s'>",
+    val = rb_sprintf("#<DL::CFunc:%p ptr=%p type=%d name='%s'>",
 	     cfunc,
 	     cfunc->ptr,
 	     cfunc->type,
 	     cfunc->name ? cfunc->name : "");
+    OBJ_TAINT(val);
+    return val;
 }