From 2f593094f0c4f828fd81a3b052ee426135135694 Mon Sep 17 00:00:00 2001
From: jsm <jsm@NetBSD.org>
Date: Sun, 12 Sep 1999 09:02:20 +0000
Subject: Security improvements for games (largely from or inspired by
 OpenBSD).

Games which run setgid from dm, but don't need to, should drop their
privileges at startup.

Games which have a scorefile should open it at startup, then drop all
privileges leaving just the open writable file descriptor.  If the
game can invoke subprocesses, this should be made close-on-exec.

Games with scorefiles should make sure they do not get a file
descriptor < 3.  (Otherwise, they could get confused and corrupt the
scorefile when using stdin, stdout or stderr.)

Some old setuid revokes from the days of setuid games change into gid
revokes.
---
 gomoku/main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'gomoku/main.c')

diff --git a/gomoku/main.c b/gomoku/main.c
index e7f0448f..7b8fc674 100644
--- a/gomoku/main.c
+++ b/gomoku/main.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: main.c,v 1.7 1999/09/08 21:45:27 jsm Exp $	*/
+/*	$NetBSD: main.c,v 1.8 1999/09/12 09:02:21 jsm Exp $	*/
 
 /*
  * Copyright (c) 1994
@@ -46,7 +46,7 @@ __COPYRIGHT("@(#) Copyright (c) 1994\n\
 #if 0
 static char sccsid[] = "@(#)main.c	8.4 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: main.c,v 1.7 1999/09/08 21:45:27 jsm Exp $");
+__RCSID("$NetBSD: main.c,v 1.8 1999/09/12 09:02:21 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -98,6 +98,9 @@ main(argc, argv)
 		"%3d        %-6s"
 	};
 
+	/* Revoke setgid privileges */
+	setregid(getgid(), getgid());
+
 	color = curmove = 0;
 
 	prog = strrchr(argv[0], '/');
-- 
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