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https://github.com/Cxbx-Reloaded/subhook.git
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12b527d642
* Replace SUBHOOK_BITS equality comparisons with SUBHOOK_X86_64 macro definition checks (less error-prone) * Improve comments in subhook_disasm() and remove unused variable (address_size) * Update copyright year across all files
42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
/* Copyright (c) 2012-2018 Zeex
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <sys/mman.h>
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void *subhook_unprotect(void *address, size_t size) {
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long pagesize;
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pagesize = sysconf(_SC_PAGESIZE);
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address = (void *)((long)address & ~(pagesize - 1));
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if (mprotect(address, size, PROT_READ | PROT_WRITE | PROT_EXEC) == 0) {
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return address;
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} else {
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return NULL;
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}
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}
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