[tor-commits] [tor-browser/tor-browser-52.4.0esr-7.5-1] Revert "bug 23104 - Add a default line height compensation"

Thu Oct 5 12:10:34 UTC 2017

commit 5117adf6b06bd2901144d15847b4cc902a94741a
Author: Georg Koppen <gk at torproject.org>
Date:   Thu Oct 5 12:08:28 2017 +0000

    Revert "bug 23104 - Add a default line height compensation"
    
    This reverts commit 722fd293451de0859106949d64dc2cb16c22a780.
    
    Backing out due to #23701: We should make sure this defense only applies
    to content and not the browser chrome.
---
 layout/generic/ReflowInput.cpp   |  6 -----
 tbb-tests/mochitest.ini          |  1 -
 tbb-tests/test_tor_bug23104.html | 51 ----------------------------------------
 3 files changed, 58 deletions(-)

diff --git a/layout/generic/ReflowInput.cpp b/layout/generic/ReflowInput.cpp
index e219ae032cc6..42f4a24b5314 100644
--- a/layout/generic/ReflowInput.cpp
+++ b/layout/generic/ReflowInput.cpp
@@ -30,7 +30,6 @@
 #include "CounterStyleManager.h"
 #include <algorithm>
 #include "mozilla/dom/HTMLInputElement.h"
-#include "nsContentUtils.h"
 
 #ifdef DEBUG
 #undef NOISY_VERTICAL_ALIGN
@@ -2769,11 +2768,6 @@ GetNormalLineHeight(nsFontMetrics* aFontMetrics)
   nscoord externalLeading = aFontMetrics->ExternalLeading();
   nscoord internalLeading = aFontMetrics->InternalLeading();
   nscoord emHeight = aFontMetrics->EmHeight();
-
-  if (nsContentUtils::ShouldResistFingerprinting()) {
-    return NSToCoordRound(emHeight * NORMAL_LINE_HEIGHT_FACTOR);
-  }
-
   switch (GetNormalLineHeightCalcControl()) {
   case eIncludeExternalLeading:
     normalLineHeight = emHeight+ internalLeading + externalLeading;
diff --git a/tbb-tests/mochitest.ini b/tbb-tests/mochitest.ini
index fca972a51211..3d2e7c9db803 100644
--- a/tbb-tests/mochitest.ini
+++ b/tbb-tests/mochitest.ini
@@ -10,4 +10,3 @@ support-files =
 [test_tor_bug2875.html]
 [test_tor_bug4755.html]
 [test_tor_bug5856.html]
-[test_tor_bug23104.html]
diff --git a/tbb-tests/test_tor_bug23104.html b/tbb-tests/test_tor_bug23104.html
deleted file mode 100644
index 77d7d190d7c8..000000000000
--- a/tbb-tests/test_tor_bug23104.html
+++ /dev/null
@@ -1,51 +0,0 @@
-<!DOCTYPE HTML>
-<meta charset="UTF-8">
-<html>
-<head>
-  <title>Test for Tor Bug #23104: CSS line-height reveals the platform Tor browser is running</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <script type="application/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
-  <style type="text/css">
-    span {
-      background-color: #000;
-      color: #fff;
-      font-size: 16.5px;
-    }
-  </style>
-</head>
-<body>
-<span id="test1">Test1</span>
-<span id="test2">كلمة</span>
-<span id="test3">ação</span>
-<script type="application/javascript;version=1.7">
-
-let setPref = function* (key, value) {
-  return new Promise(function(resolve, reject) {
-    SpecialPowers.pushPrefEnv({"set": [[key, value]]}, resolve);
-  });
-}
-
-function getStyle(el, styleprop) {
-  el = document.getElementById(el);
-  return document.defaultView.getComputedStyle(el, null).getPropertyValue(styleprop);
-}
-
-function validateElement(elementName, isFingerprintResistent) {
-  var fontSize = getStyle(elementName, 'font-size');
-  var lineHeight = getStyle(elementName, 'line-height');
-  var validationCb = isFingerprintResistent ? is : isnot;
-  validationCb(parseFloat(lineHeight), Math.ceil(parseFloat(fontSize)) * 1.2, 'Line Height validation');
-}
-
-add_task(function* () {
-  for (let resistFingerprintingValue of [true, false]) {
-  yield setPref("privacy.resistFingerprinting", resistFingerprintingValue);
-    for (let elementId of ['test1', 'test2', 'test3']) {
-      validateElement(elementId, resistFingerprintingValue);
-    }
-  }
-});
-
-</script>
-</body>
-</html>

