http://svn.php.net/viewvc?view=revision&revision=288943

Index: ext/posix/posix.c
===================================================================
--- ext/posix/posix.c	(revision 286880)
+++ ext/posix/posix.c	(revision 288943)
@@ -840,7 +840,8 @@
 		RETURN_FALSE;
 	}
 
-	if (PG(safe_mode) && (!php_checkuid(path, NULL, CHECKUID_ALLOW_ONLY_DIR))) {
+	if (php_check_open_basedir_ex(path, 0 TSRMLS_CC) ||
+			(PG(safe_mode) && (!php_checkuid(path, NULL, CHECKUID_ALLOW_ONLY_DIR)))) {
 		RETURN_FALSE;
 	}