From 647ec2253a1bdb04c0e60e9d5c78159c7df3fad8 Mon Sep 17 00:00:00 2001
From: dhartmei <>
Date: Mon, 29 Jul 2002 19:54:42 +0000
Subject: Replace atexit handler. mprotect() the pages so an attempt to modify
 the function pointers from the outside will segfault. Idea, hints and
 feedback from deraadt. ok deraadt.

---
 src/lib/libc/stdlib/atexit.h | 56 ++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 30 deletions(-)

(limited to 'src/lib/libc/stdlib/atexit.h')

diff --git a/src/lib/libc/stdlib/atexit.h b/src/lib/libc/stdlib/atexit.h
index e41a7cb86c..6424dfdbbc 100644
--- a/src/lib/libc/stdlib/atexit.h
+++ b/src/lib/libc/stdlib/atexit.h
@@ -1,45 +1,41 @@
-/*-
- * Copyright (c) 1990 The Regents of the University of California.
+/*	$OpenBSD: atexit.h,v 1.3 2002/07/29 19:54:42 dhartmei Exp $ */
+
+/*
+ * Copyright (c) 2002 Daniel Hartmeier
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
  *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ *    - Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    - Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
  *
- *	$OpenBSD: atexit.h,v 1.2 1996/08/19 08:33:23 tholo Exp $
  */
 
-/* must be at least 32 to guarantee ANSI conformance */
-#define	ATEXIT_SIZE	32
-
 struct atexit {
 	struct atexit *next;		/* next in list */
 	int ind;			/* next index in this table */
-	void (*fns[ATEXIT_SIZE])();	/* the table itself */
+	int max;			/* max entries >= ATEXIT_SIZE */
+	void (*fns[1])();		/* the table itself */
 };
 
+extern int __atexit_invalid;
 extern struct atexit *__atexit;		/* points to head of LIFO stack */
-- 
cgit v1.2.3-55-g6feb