/*
|
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
|
* All rights reserved.
|
*
|
* 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.
|
* 3. The name of the author may not be used to endorse or promote products
|
* derived from this software without specific prior written permission.
|
*
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
|
*/
|
|
#include "tests.h"
|
#include <string.h>
|
#include <sys/mman.h>
|
|
void *
|
tail_alloc(const size_t size)
|
{
|
const size_t page_size = get_page_size();
|
const size_t len = (size + page_size - 1) & -page_size;
|
const size_t alloc_size = len + 6 * page_size;
|
|
void *p = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
if (MAP_FAILED == p)
|
perror_msg_and_fail("mmap(%zu)", alloc_size);
|
|
void *start_work = p + 3 * page_size;
|
void *tail_guard = start_work + len;
|
|
if (munmap(p, page_size) ||
|
munmap(p + 2 * page_size, page_size) ||
|
munmap(tail_guard, page_size) ||
|
munmap(tail_guard + 2 * page_size, page_size))
|
perror_msg_and_fail("munmap");
|
|
memset(start_work, 0xff, len);
|
return tail_guard - size;
|
}
|
|
void *
|
tail_memdup(const void *p, const size_t size)
|
{
|
void *dest = tail_alloc(size);
|
memcpy(dest, p, size);
|
return dest;
|
}
|
