annotate dyncallback/dyncall_alloc_wx_win32.c @ 202:030fbb70aa1b

- changed allocwx code: * to introduce a call allowing to switch the written page to be executable (e.g. using mprotect) * changed mmap based code so page is always W^X
author Tassilo Philipp
date Mon, 20 Mar 2017 23:12:58 +0100
parents 3e629dc19168
children f5577f6bf97a
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1 /*
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2
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3 Package: dyncall
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4 Library: dyncallback
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5 File: dyncallback/dyncall_alloc_wx_win32.c
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6 Description: Allocate write/executable memory - Implementation for win32 platform
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7 License:
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8
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9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11
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12 Permission to use, copy, modify, and distribute this software for any
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13 purpose with or without fee is hereby granted, provided that the above
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14 copyright notice and this permission notice appear in all copies.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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23
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24 */
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25
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26
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27 #include "dyncall_alloc_wx.h"
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28 #include <windows.h>
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29 #include <assert.h>
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30
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31 DCerror dcAllocWX(size_t size, void** ptr)
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32 {
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33 LPVOID p = VirtualAlloc(0, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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34 if (p == NULL) return -1;
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35 *ptr = p;
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36 return 0;
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37 }
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38
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39 DCerror dcInitExecWX(void* p, size_t size)
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40 {
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41 return 0;
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42 }
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43
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44 void dcFreeWX(void* p, size_t size)
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45 {
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46 BOOL b = VirtualFree( p, 0, MEM_RELEASE);
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47 assert(b);
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48 }