c22a7de798
This removes another way to obtain objects larger than PTRDIFF_MAX. The only known remaining hole is now jemalloc's merging of virtual memory spans. Technically this could be wrapped in an __LP64__ ifndef since it can't occur on 64-bit due to the 1:1 split. It doesn't really matter either way. Change-Id: Iab2af242b775bc98a59421994d87aca0433215bd
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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 <errno.h>
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#include <sys/mman.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "private/bionic_macros.h"
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extern "C" void* ___mremap(void*, size_t, size_t, int, void*);
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void* mremap(void* old_address, size_t old_size, size_t new_size, int flags, ...) {
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// prevent allocations large enough for `end - start` to overflow
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size_t rounded = BIONIC_ALIGN(new_size, PAGE_SIZE);
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if (rounded < new_size || rounded > PTRDIFF_MAX) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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void* new_address = nullptr;
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// The optional argument is only valid if the MREMAP_FIXED flag is set,
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// so we assume it's not present otherwise.
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if ((flags & MREMAP_FIXED) != 0) {
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va_list ap;
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va_start(ap, flags);
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new_address = va_arg(ap, void*);
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va_end(ap);
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}
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return ___mremap(old_address, old_size, new_size, flags, new_address);
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}
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