diff --git includes/file.inc includes/file.inc
index 4f7a4c3..974d264 100644
--- includes/file.inc
+++ includes/file.inc
@@ -2361,6 +2361,13 @@ function file_directory_temp() {
       // If no directory has been found default to 'files/tmp' or 'files\\tmp'.
       $temporary_directory = variable_get('file_public_path', conf_path() . '/files') . $path_delimiter . 'tmp';
     }
+    else {
+      // Since the temporary directory may be shared amongst many different
+      // users and Drupal installations, restrict to a subdirectory which is
+      // unique to this installation of Drupal.
+      $temporary_directory .= $path_delimiter . 'drupal-' . substr(hash('sha256', drupal_get_hash_salt()), 0, 8);
+      drupal_mkdir($temporary_directory);
+    }
     // Save the path of the discovered directory.
     variable_set('file_temporary_path', $temporary_directory);
   }
diff --git includes/updater.inc includes/updater.inc
index b49d5d2..0092fb9 100644
--- includes/updater.inc
+++ includes/updater.inc
@@ -164,7 +164,9 @@ class Updater {
    *   The name of the project.
    */
   public static function getProjectName($directory) {
-    return basename($directory);
+    $info_file = self::findInfoFile($directory);
+    $info = drupal_parse_info_file($info_file);
+    return !empty($info['project']) ? $info['project'] : basename($directory);
   }
 
   /**
diff --git modules/field/field.crud.inc modules/field/field.crud.inc
index eda3218..27b1638 100644
--- modules/field/field.crud.inc
+++ modules/field/field.crud.inc
@@ -363,7 +363,11 @@ function field_read_fields($params = array(), $include_additional = array()) {
     $field['translatable'] = $record['translatable'];
     $field['deleted'] = $record['deleted'];
 
-    module_invoke_all('field_read_field', $field);
+    // Manually invoke since $field is passed by reference.
+    foreach(module_implements('field_read_field') as $module) {
+      $function = $module . '_field_read_field';
+      $function($field);
+    }
 
     // Populate storage information.
     module_load_install($field['module']);
diff --git modules/system/system.updater.inc modules/system/system.updater.inc
index 92a1529..aa10e98 100644
--- modules/system/system.updater.inc
+++ modules/system/system.updater.inc
@@ -26,12 +26,16 @@ class ModuleUpdater extends Updater implements DrupalUpdaterInterface {
    */
   public function getInstallDirectory() {
     if ($relative_path = drupal_get_path('module', $this->name)) {
-      $relative_path = dirname($relative_path);
+      $path = DRUPAL_ROOT . '/' . $relative_path;
+      $project_name = $this->getProjectName($path);
+      do {
+        $path = dirname($path);
+      } while ($this->getProjectName($path) == $project_name);
     }
     else {
-      $relative_path = 'sites/all/modules';
+      $path = DRUPAL_ROOT . '/' . 'sites/all/modules';
     }
-    return DRUPAL_ROOT . '/' . $relative_path;
+    return $path;
   }
 
   public function isInstalled() {
diff --git modules/update/update.module modules/update/update.module
index c5551e2..952e50a 100644
--- modules/update/update.module
+++ modules/update/update.module
@@ -294,6 +294,7 @@ function update_cron() {
     // the cached data for all projects, attempt to re-fetch, and trigger any
     // configured notifications about the new status.
     update_refresh();
+    update_fetch_data();
     _update_cron_notify();
   }
   else {