Status wrt upstream: Also applied upstream in shadow-4.1.4.3
--- a/src/su.c
+++ b/src/su.c
@@ -342,7 +342,7 @@
 #endif
 #endif				/* !USE_PAM */
 
-	sanitize_env ();
+	/* sanitize_env (); */
 
 	(void) setlocale (LC_ALL, "");
 	(void) bindtextdomain (PACKAGE, LOCALEDIR);
