Libc-997.1.1.tar.gz

[apple/libc.git] / secure / memcpy_chk.c

diff --git a/secure/memcpy_chk.c b/secure/memcpy_chk.c
index 6f2e06ba6316ac0e64c781344b11249f6a841352..bb286fad9fe7f2691469f655fb79e5d0fabfbc07 100644 (file)
--- a/secure/memcpy_chk.c
+++ b/secure/memcpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  *
@@ -23,14 +23,19 @@
 
 #include <stdlib.h>
 #include <string.h>
-
-extern void __chk_fail (void) __attribute__((__noreturn__));
+#include "secure.h"
 
 void *
 __memcpy_chk (void *dest, const void *src, size_t len, size_t dstlen)
 {
   if (__builtin_expect (dstlen < len, 0))
-    __chk_fail ();
+    __chk_fail_overflow ();
+
+  /* On OS X, memcpy has supported overlapping buffers for many years.
+   * While technically, this will catch buggy code, we should not abort.
+   * if (__chk_assert_no_overlap)
+   *   __chk_overlap(dest, len, src, len);
+   */
 
   return memcpy (dest, src, len);
 }