Mine

--- linux-ftpd-0.17/ftpd/popen.c.bak	1999-07-16 11:12:54.000000000 +1000
+++ linux-ftpd-0.17/ftpd/popen.c	2006-08-25 13:31:33.950447078 +1000
@@ -169,8 +169,13 @@
 		 * XXX: this doesn't seem right... and shouldn't
 		 * we initgroups, or at least setgroups(0,0)?
 		 */
-		setgid(getegid());
-		setuid(i);
+
+/*
+ * PSz 25 Aug 06  Must check the return status of these setgid/setuid calls,
+ * see  http://www.bress.net/blog/archives/34-setuid-madness.html
+ */
+		if ( setgid(geteuid())	!= 0 ) _exit(1);
+		if ( setuid(i)		!= 0 ) _exit(1);
  
 #ifndef __linux__
 /* 

@@ -1408,7 +1412,8 @@
 			goto bad;
 		sleep(tries);
 	}
-	(void) seteuid((uid_t)pw->pw_uid);
+/* PSz 25 Aug 06  Check return status */
+	if (seteuid((uid_t)pw->pw_uid) != 0) _exit(1);
 	sigfillset(&allsigs);
 	sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
 
@@ -1440,7 +1445,8 @@
 bad:
 	/* Return the real value of errno (close may change it) */
 	t = errno;
-	(void) seteuid((uid_t)pw->pw_uid);
+/* PSz 25 Aug 06  Check return status */
+	if (seteuid((uid_t)pw->pw_uid) != 0) _exit(1);
 	sigfillset (&allsigs);
 	sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
 	(void) close(s);