xnu-3248.30.4.tar.gz

[apple/xnu.git] / libkern / stack_protector.c

diff --git a/libkern/stack_protector.c b/libkern/stack_protector.c
index dad8a7e2e455adafe679329f63d871cbea293a4e..21c4d06aea56f8fd063ae011f1a10d72a5f1b646 100644 (file)
--- a/libkern/stack_protector.c
+++ b/libkern/stack_protector.c
@@ -1,55 +1,35 @@
 /*
- * Copyright (c) 2008 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2008-2012 Apple Inc. All rights reserved.
  *
- * %Begin-Header%
- * 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, and the entire permission notice in its entirety,
- *    including the disclaimer of warranties.
- * 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. The name of the author may not be used to endorse or promote
- *    products derived from this software without specific prior
- *    written permission.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
- * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- * %End-Header%
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
-/*******************************************************************************
-* NOTE: This implementation of the stack check routines required by the GCC
-* -fstack-protector flag is only safe for kernel extensions.
-*******************************************************************************/
-
-#include <sys/types.h>
-#include <sys/random.h>
+#include <libkern/stack_protector.h>
 #include <kern/debug.h>
 
-long __stack_chk_guard[8];
-void __stack_chk_fail(void);
-
-static void __guard_setup(void) __attribute__((constructor));
-
-static void
-__guard_setup(void)
-{
-    /* Cannot report failure.  */
-    read_random(__stack_chk_guard, sizeof(__stack_chk_guard));
-}
+unsigned long __stack_chk_guard = 0UL;
 
 void
 __stack_chk_fail(void)