From d97d61cb3ece153b157604ee2cd04f442f8d1228 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Tue, 12 Feb 2013 12:42:40 +0100
Subject: [PATCH] Handle saved uid/gid properly

---
 suidgw.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/suidgw.c b/suidgw.c
index e8196ac..63ac0d3 100644
--- a/suidgw.c
+++ b/suidgw.c
@@ -6,6 +6,8 @@
 
 #undef DEBUG
 
+#define _GNU_SOURCE
+
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
@@ -139,10 +141,10 @@ static void check_stat(void)
 
 static void switch_ugid(void)
 {
-  if (setegid(use_gid) < 0)
+  if (setresgid(getgid(), use_gid, use_gid) < 0)
     die("Failed to set group id: %m");
 
-  if (seteuid(use_uid) < 0)
+  if (setresuid(getuid(), use_uid, use_uid) < 0)
     die("Failed to set user id: %m");
 }
 
-- 
2.39.2