From c0453dd391c570eb1a52eeaa817b9979f2618297 Mon Sep 17 00:00:00 2001
From: csteipp <csteipp@wikimedia.org>
Date: Tue, 17 Mar 2015 15:20:56 -0700
Subject: [PATCH] SECURITY: Escape > in Html::expandAttributes

Escape > characters in attributes, so we don't confuse post-processing,
like LanguageConverter.

Bug: T73394
Change-Id: I8d74e6a0e873cc54dec9557e2d8f7409e65f425f
---
 includes/Html.php            | 7 +++++--
 tests/parser/parserTests.txt | 4 ++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/includes/Html.php b/includes/Html.php
index 8799225..f429fb2 100644
--- a/includes/Html.php
+++ b/includes/Html.php
@@ -603,17 +603,20 @@ class Html {
 			} else {
 				// Apparently we need to entity-encode \n, \r, \t, although the
 				// spec doesn't mention that.  Since we're doing strtr() anyway,
-				// and we don't need <> escaped here, we may as well not call
-				// htmlspecialchars().
+				// we may as well not call htmlspecialchars().
 				// @todo FIXME: Verify that we actually need to
 				// escape \n\r\t here, and explain why, exactly.
 				#
 				// We could call Sanitizer::encodeAttribute() for this, but we
 				// don't because we're stubborn and like our marginal savings on
 				// byte size from not having to encode unnecessary quotes.
+				// The only difference between this transform and the one by
+				// Sanitizer::encodeAttribute() is '<' is only encoded here if
+				// $wgWellFormedXml is set, and ' is not encoded.
 				$map = array(
 					'&' => '&amp;',
 					'"' => '&quot;',
+					'>' => '&gt;',
 					"\n" => '&#10;',
 					"\r" => '&#13;',
 					"\t" => '&#9;'
diff --git a/tests/parser/parserTests.txt b/tests/parser/parserTests.txt
index 966b666..d6b085d 100644
--- a/tests/parser/parserTests.txt
+++ b/tests/parser/parserTests.txt
@@ -13669,7 +13669,7 @@ section 5
 </ul>
 </div>
 
-<h2><a href="#text_.3E_text" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="text_.3E_text">text &gt; text</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=1" title="Edit section: text > text">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
+<h2><a href="#text_.3E_text" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="text_.3E_text">text &gt; text</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=1" title="Edit section: text &gt; text">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
 <p>section 1
 </p>
 <h2><a href="#text_.3C_text" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="text_.3C_text">text &lt; text</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=2" title="Edit section: text &lt; text">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
@@ -19294,7 +19294,7 @@ __TOC__
 </div>
 
 <h2><a href="#Hello" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="Hello"><sup class="in-h2">Hello</sup></span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=1" title="Edit section: Hello">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
-<h2><a href="#b.22.3EEvilbye" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="b.22.3EEvilbye"><sup> b"&gt;Evilbye</sup></span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=2" title="Edit section: b&quot;>Evilbye">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
+<h2><a href="#b.22.3EEvilbye" class="mw-headline-anchor" aria-hidden="true" title="Link to this section">§</a><span class="mw-headline" id="b.22.3EEvilbye"><sup> b"&gt;Evilbye</sup></span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/index.php?title=Parser_test&amp;action=edit&amp;section=2" title="Edit section: b&quot;&gt;Evilbye">edit</a><span class="mw-editsection-bracket">]</span></span></h2>
 
 !! end
 
-- 
1.8.4.5

