--- Libc/Libc-1725.40.4/secure/chk_fail.c
+++ Libc/Libc-583/secure/chk_fail.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2007, 2008 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  *
@@ -21,91 +21,20 @@
  * @APPLE_LICENSE_HEADER_END@
  */
 
-#include <os/assumes.h>
-#include <stdint.h>
-#include <TargetConditionals.h>
-#include "crt_externs.h"
+#include <syslog.h>
+#include <sys/sysctl.h>
+#include <sys/param.h>
+#include <unistd.h>
 
-#ifndef PR_13085474_CHECK
-#define PR_13085474_CHECK TARGET_OS_OSX
-#endif
+extern void __abort(void) __dead2;
 
-#if PR_13085474_CHECK
-/* Some shipped applications fail this check and were tested against
- * versions of these functions that supported overlapping buffers.
- *
- * We would rather let such applications run, using the old memmove
- * implementation, than abort() because they can't use the new
- * implementation.
- */
+void
+__attribute__ ((noreturn))
+__chk_fail (void)
+{
+  const char message[] = "[%d] detected buffer overflow";
 
-#include <libkern/OSAtomic.h>
-#include <mach-o/dyld.h>
-#include <mach-o/dyld_priv.h>
-#if TARGET_OS_OSX
-#define START_VERSION dyld_platform_version_macOS_10_9
-#else
-#error "This platform should not build with PR_13085474_CHECK=1"
-#endif
-#endif /* !PR_13085474_CHECK */
+  syslog(LOG_CRIT, message, getpid());
 
-/* For PR_13085474_CHECK set, we initialize __chk_assert_no_overlap to
- * 1 initially and then reset it to 0 if the main image of the process
- * was linked earlier than 10.9.
- *
- * If PR_13085474_CHECK is zero, then we never do any sdk version checking
- * and always do overlap checks.
- */
-__attribute__ ((visibility ("hidden")))
-uint32_t __chk_assert_no_overlap = 1;
-
-#if PR_13085474_CHECK
-static bool
-__chk_assert_sdk_pre_start(const struct mach_header *mh) {
-  return (dyld_get_active_platform() == PLATFORM_MACOS &&
-      !dyld_sdk_at_least(mh, START_VERSION));
+  __abort();
 }
-#endif
-
-__attribute__ ((visibility ("hidden")))
-void __chk_init(void) {
-#if PR_13085474_CHECK
-  if (__chk_assert_sdk_pre_start((const struct mach_header *)
-        _NSGetMachExecuteHeader())) {
-    __chk_assert_no_overlap = 0;
-  }
-#endif
-}
-
-__attribute__ ((visibility ("hidden")))
-__attribute__ ((noreturn))
-void
-__chk_fail_overflow (void) {
-  os_crash("detected buffer overflow");
-}
-
-__attribute__ ((visibility ("hidden")))
-__attribute__ ((noreturn))
-void
-__chk_fail_overlap (void) {
-  os_crash("detected source and destination buffer overlap");
-}
-
-__attribute__ ((visibility ("hidden")))
-void
-__chk_overlap (const void *_a, size_t an, const void *_b, size_t bn) {
-  uintptr_t a = (uintptr_t)_a;
-  uintptr_t b = (uintptr_t)_b;
-
-  if (__builtin_expect(an == 0 || bn == 0, 0)) {
-    return;
-  } else if (__builtin_expect(a == b, 0)) {
-    __chk_fail_overlap();
-  } else if (a < b) {
-    if (__builtin_expect(a + an > b, 0))
-      __chk_fail_overlap();
-  } else { // b < a
-    if (__builtin_expect(b + bn > a, 0))
-      __chk_fail_overlap();
-  }
-}