merge revision(s) r48161:

nagachika · nagachika · commit 31d25ce50379 · 2014-10-27T11:23:17.000Z
* lib/rexml/entity.rb: keep the entity size within the limitation.
	  reported by Willis Vandevanter &lt;will@silentrobots.com&gt; and
	  patched by nahi.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@48163 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,9 @@
+Mon Oct 27 20:20:14 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/rexml/entity.rb: keep the entity size within the limitation.
+	  reported by Willis Vandevanter <will@silentrobots.com> and
+	  patched by nahi.
+
 Sun Oct 26 03:31:46 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_method.c (rb_method_entry_make): warn redefinition only for
diff --git a/lib/rexml/entity.rb b/lib/rexml/entity.rb
@@ -138,8 +138,14 @@ def value
         matches = @value.scan(PEREFERENCE_RE)
         rv = @value.clone
         if @parent
+          sum = 0
           matches.each do |entity_reference|
             entity_value = @parent.entity( entity_reference[0] )
+            if sum + entity_value.bytesize > Security.entity_expansion_text_limit
+              raise "entity expansion has grown too large"
+            else
+              sum += entity_value.bytesize
+            end
             rv.gsub!( /%#{entity_reference.join};/um, entity_value )
           end
         end
diff --git a/test/rexml/test_document.rb b/test/rexml/test_document.rb
@@ -45,6 +45,20 @@ def test_new
 <member>
 &a;
 </member>
+EOF
+
+    XML_WITH_NESTED_PARAMETER_ENTITY = <<EOF
+<!DOCTYPE root [
+  <!ENTITY % a "BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.">
+  <!ENTITY % b "%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;">
+  <!ENTITY % c "%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;">
+  <!ENTITY % d "%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;">
+  <!ENTITY % e "%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;">
+  <!ENTITY % f "%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;">
+  <!ENTITY % g "%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;">
+  <!ENTITY test "test %g;">
+]>
+<cd></cd>
 EOF
 
   XML_WITH_4_ENTITY_EXPANSION = <<EOF
@@ -85,6 +99,19 @@ def test_entity_expansion_limit
     REXML::Security.entity_expansion_limit = 10000
   end
 
+  def test_entity_expansion_limit_for_parameter_entity
+    assert_raise(REXML::ParseException) do
+      REXML::Document.new(XML_WITH_NESTED_PARAMETER_ENTITY)
+    end
+    REXML::Security.entity_expansion_limit = 100
+    assert_equal(100, REXML::Security.entity_expansion_limit)
+    assert_raise(REXML::ParseException) do
+      REXML::Document.new(XML_WITH_NESTED_PARAMETER_ENTITY)
+    end
+  ensure
+    REXML::Security.entity_expansion_limit = 10000
+  end
+
   def test_tag_in_cdata_with_not_ascii_only_but_ascii8bit_encoding_source
     tag = "<b>...</b>"
     message = "こんにちは、世界！" # Hello world! in Japanese
diff --git a/test/rexml/test_entity.rb b/test/rexml/test_entity.rb
@@ -122,6 +122,22 @@ def test_entity_string_limit
     end
   end
 
+  def test_entity_string_limit_for_parameter_entity
+    template = '<!DOCTYPE bomb [ <!ENTITY % a "^" > <!ENTITY bomb "$" > ]><root/>'
+    len      = 5120 # 5k per entity
+    template.sub!(/\^/, "B" * len)
+
+    # 10k is OK
+    entities = '%a;' * 2 # 5k entity * 2 = 10k
+    REXML::Document.new(template.sub(/\$/, entities))
+
+    # above 10k explodes
+    entities = '%a;' * 3 # 5k entity * 2 = 15k
+    assert_raises(REXML::ParseException) do
+      REXML::Document.new(template.sub(/\$/, entities))
+    end
+  end
+
   def test_raw
     source = '<!DOCTYPE foo [
 <!ENTITY ent "replace">
diff --git a/version.h b/version.h
@@ -1,10 +1,10 @@
 #define RUBY_VERSION "2.1.4"
-#define RUBY_RELEASE_DATE "2014-10-26"
-#define RUBY_PATCHLEVEL 264
+#define RUBY_RELEASE_DATE "2014-10-27"
+#define RUBY_PATCHLEVEL 265
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 10
-#define RUBY_RELEASE_DAY 26
+#define RUBY_RELEASE_DAY 27
 
 #include "ruby/version.h"
 
