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63 lines
2.3 KiB
63 lines
2.3 KiB
/* |
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* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org> |
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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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* 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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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "tests.h" |
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#include <string.h> |
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#include <sys/mman.h> |
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void * |
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tail_alloc(const size_t size) |
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{ |
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const size_t page_size = get_page_size(); |
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const size_t len = (size + page_size - 1) & -page_size; |
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const size_t alloc_size = len + 6 * page_size; |
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void *p = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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if (MAP_FAILED == p) |
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perror_msg_and_fail("mmap(%zu)", alloc_size); |
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void *start_work = p + 3 * page_size; |
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void *tail_guard = start_work + len; |
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if (munmap(p, page_size) || |
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munmap(p + 2 * page_size, page_size) || |
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munmap(tail_guard, page_size) || |
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munmap(tail_guard + 2 * page_size, page_size)) |
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perror_msg_and_fail("munmap"); |
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memset(start_work, 0xff, len); |
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return tail_guard - size; |
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} |
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void * |
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tail_memdup(const void *p, const size_t size) |
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{ |
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void *dest = tail_alloc(size); |
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memcpy(dest, p, size); |
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return dest; |
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}
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