Changeset View
Changeset View
Standalone View
Standalone View
lib/libthr/thread/thr_libcdeps.c
- This file was added.
| /*- | |||||
| * SPDX-License-Identifier: BSD-2-Clause | |||||
| * | |||||
| * Copyright 2020 Alex Richardson <arichardson@FreeBSD.org> | |||||
| * | |||||
| * This software was developed by SRI International and the University of | |||||
| * Cambridge Computer Laboratory (Department of Computer Science and | |||||
| * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the | |||||
| * DARPA SSITH research programme. | |||||
| * | |||||
| * This work was supported by Innovate UK project 105694, "Digital Security by | |||||
| * Design (DSbD) Technology Platform Prototype". | |||||
| * | |||||
| * 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. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. | |||||
| */ | |||||
| #ifdef AVOID_INTERPOSABLE_LIBC_FUNCTIONS | |||||
| #include <sys/cdefs.h> | |||||
| #include <stddef.h> | |||||
| void *memcpy(void *, const void *, size_t) __hidden; | |||||
| void *memmove(void *, const void *, size_t) __hidden; | |||||
| void *memset(void *, int, size_t) __hidden; | |||||
| /* | |||||
| * This file exists to avoid interposable calls to libc functions inside | |||||
| * functions that are intercepted by sanitizer runtimes. One example where we | |||||
| * need to avoid interposable function calls is the copy of the ucontext_t | |||||
| * argument in handle_signal() as this results in crashes when linking | |||||
| * applications with ThreadSanitizer. Another example is the libthr-internal | |||||
| * allocator that calls memset and memcpy. With interposable function calls | |||||
| * ThreadSanitizer reports false-positive race conditions since the locks | |||||
| * guarding the allocation functions cannot be seen by the TSan runtime. | |||||
| * | |||||
| * Note: This file is only needed for the shared library build. | |||||
| */ | |||||
| #include "../../libc/string/memmove.c" | |||||
| __strong_reference(memmove, memcpy); | |||||
| #include "../../libc/string/memset.c" | |||||
| #endif | |||||