diff -up util-linux-2.13-pre7/mount/umount.c.kzak util-linux-2.13-pre7/mount/umount.c
--- util-linux-2.13-pre7/mount/umount.c.kzak	2007-10-08 15:22:38.000000000 +0200
+++ util-linux-2.13-pre7/mount/umount.c	2007-10-08 15:24:01.000000000 +0200
@@ -102,8 +102,12 @@ check_special_umountprog(const char *spe
 				char *umountargs[8];
 				int i = 0;
 
-				setuid(getuid());
-				setgid(getgid());
+				if(setgid(getgid()) < 0)
+					die(EX_FAIL, _("umount: cannot set group id: %s"), strerror(errno));
+
+				if(setuid(getuid()) < 0)
+					die(EX_FAIL, _("umount: cannot set user id: %s"), strerror(errno));
+
 				umountargs[i++] = umountprog;
 				umountargs[i++] = xstrdup(node);
 				if (nomtab)
diff -up util-linux-2.13-pre7/mount/mount.c.kzak util-linux-2.13-pre7/mount/mount.c
--- util-linux-2.13-pre7/mount/mount.c.kzak	2007-10-08 15:22:38.000000000 +0200
+++ util-linux-2.13-pre7/mount/mount.c	2007-10-08 15:24:01.000000000 +0200
@@ -600,8 +600,12 @@ check_special_mountprog(const char *spec
 		 char *oo, *mountargs[11];
 		 int i = 0;
 
-		 setuid(getuid());
-		 setgid(getgid());
+		 if(setgid(getgid()) < 0)
+			 die(EX_FAIL, _("mount: cannot set group id: %s"), strerror(errno));
+
+		 if(setuid(getuid()) < 0)
+			 die(EX_FAIL, _("mount: cannot set user id: %s"), strerror(errno));
+
 		 oo = fix_opts_string (flags, extra_opts, NULL);
 		 mountargs[i++] = mountprog;
 		 mountargs[i++] = spec;