/* * Copyright (c) 2007-2013 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * 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. 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_LICENSE_HEADER_END@ */ #include <os/assumes.h> #include <stdint.h> #include <TargetConditionals.h> __attribute__ ((visibility ("hidden"))) uint32_t __chk_assert_no_overlap = 1; __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(); } }