Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.1116
diff -u -p -r1.1116 common.inc
--- includes/common.inc	25 Feb 2010 20:57:39 -0000	1.1116
+++ includes/common.inc	26 Feb 2010 23:02:01 -0000
@@ -4373,6 +4373,14 @@ function drupal_cron_run() {
   // Allow execution to continue even if the request gets canceled.
   @ignore_user_abort(TRUE);
 
+  // Prevent session information from being saved while the cron is running.
+  drupal_save_session(FALSE);
+
+  // Force the current user to anonymous to ensure consistent permissions on
+  // cron runs.
+  $original_user = $GLOBALS['user'];
+  $GLOBALS['user'] = drupal_anonymous_user();
+
   // Try to allocate enough time to run all the hook_cron implementations.
   drupal_set_time_limit(240);
 
@@ -4433,6 +4441,9 @@ function drupal_cron_run() {
       $queue->deleteItem($item);
     }
   }
+  // Restore the user.
+  $GLOBALS['user'] = $original_user;
+
   return $return;
 }
 
@@ -4447,6 +4458,10 @@ function drupal_cron_cleanup() {
     // Release cron semaphore
     variable_del('cron_semaphore');
   }
+
+  drupal_save_session(TRUE);
+
+  return TRUE;
 }
 
 /**
Index: modules/dblog/dblog.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/dblog/dblog.test,v
retrieving revision 1.34
diff -u -p -r1.34 dblog.test
--- modules/dblog/dblog.test	26 Feb 2010 17:22:39 -0000	1.34
+++ modules/dblog/dblog.test	26 Feb 2010 23:02:04 -0000
@@ -74,9 +74,7 @@ class DBLogTestCase extends DrupalWebTes
     $this->assertTrue($count > $row_limit, t('Dblog row count of @count exceeds row limit of @limit', array('@count' => $count, '@limit' => $row_limit)));
 
     // Run cron job.
-    $this->drupalGet('admin/reports/status/run-cron');
-    $this->assertResponse(200);
-    $this->assertText(t('Cron ran successfully'), t('Cron ran successfully'));
+    $this->cronRun();
     // Verify dblog row count equals row limit plus one because cron adds a record after it runs.
     $count = db_query('SELECT COUNT(wid) FROM {watchdog}')->fetchField();
     $this->assertTrue($count == $row_limit + 1, t('Dblog row count of @count equals row limit of @limit plus one', array('@count' => $count, '@limit' => $row_limit)));