e4314da2e4
When libthr is statically linked into the binary, order of the constructors execution is not deterministic. It is possible for the application constructor to use pthread_mutex_* functions before the libthr initialization was done. Handle it by: - making thr_malloc.c locking functions operational when curthread is not yet set; - making __thr_malloc_init() idempotent, allowing more than one call to it; - unconditionally calling __thr_malloc_init() before initializing a process-private mutex. Reported and tested by: mmel Sponsored by: The FreeBSD Foundation MFC after: 1 week
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <rtld_malloc.h>
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#include "thr_private.h"
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int npagesizes;
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size_t *pagesizes;
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static size_t pagesizes_d[2];
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static struct umutex thr_malloc_umtx;
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void
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__thr_malloc_init(void)
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{
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if (npagesizes != 0)
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return;
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npagesizes = getpagesizes(pagesizes_d, nitems(pagesizes_d));
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if (npagesizes == -1) {
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npagesizes = 1;
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pagesizes_d[0] = PAGE_SIZE;
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}
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pagesizes = pagesizes_d;
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_thr_umutex_init(&thr_malloc_umtx);
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}
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static void
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thr_malloc_lock(struct pthread *curthread)
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{
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if (curthread == NULL)
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return;
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curthread->locklevel++;
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_thr_umutex_lock(&thr_malloc_umtx, TID(curthread));
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}
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static void
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thr_malloc_unlock(struct pthread *curthread)
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{
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if (curthread == NULL)
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return;
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_thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
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curthread->locklevel--;
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_thr_ast(curthread);
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}
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void *
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__thr_calloc(size_t num, size_t size)
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{
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struct pthread *curthread;
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void *res;
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curthread = _get_curthread();
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thr_malloc_lock(curthread);
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res = __crt_calloc(num, size);
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thr_malloc_unlock(curthread);
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return (res);
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}
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void
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__thr_free(void *cp)
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{
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struct pthread *curthread;
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curthread = _get_curthread();
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thr_malloc_lock(curthread);
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__crt_free(cp);
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thr_malloc_unlock(curthread);
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}
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void *
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__thr_malloc(size_t nbytes)
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{
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struct pthread *curthread;
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void *res;
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curthread = _get_curthread();
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thr_malloc_lock(curthread);
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res = __crt_malloc(nbytes);
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thr_malloc_unlock(curthread);
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return (res);
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}
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void *
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__thr_realloc(void *cp, size_t nbytes)
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{
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struct pthread *curthread;
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void *res;
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curthread = _get_curthread();
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thr_malloc_lock(curthread);
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res = __crt_realloc(cp, nbytes);
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thr_malloc_unlock(curthread);
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return (res);
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}
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void
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__thr_malloc_prefork(struct pthread *curthread)
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{
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_thr_umutex_lock(&thr_malloc_umtx, TID(curthread));
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}
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void
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__thr_malloc_postfork(struct pthread *curthread)
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{
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_thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
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}
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