5b7c9c5845
On Linux if a detour crossed a page boundary we would only change the memory protection of the first page (as we were aligning the address as required, but not taking into account the length). I don't have an easy way to test this but it looks correct. `addr + len` doesn't appear to need to be aligned though, so another option could be to use `(addr - startPage) + length` as len. Also fixed a non-zero offset being passed into CDetour's ApplyPatch function - this is never done internally anywhere, but it doesn't hurt to fix it. Fixes #984
139 lines
4.3 KiB
C++
139 lines
4.3 KiB
C++
/**
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* vim: set ts=4 :
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* =============================================================================
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* SourceMod
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* Copyright (C) 2004-2010 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As a special exception, AlliedModders LLC gives you permission to link the
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* code of this program (as well as its derivative works) to "Half-Life 2," the
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* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
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* by the Valve Corporation. You must obey the GNU General Public License in
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* all respects for all other code used. Additionally, AlliedModders LLC grants
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* this exception to all derivative works. AlliedModders LLC defines further
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* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
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* or <http://www.sourcemod.net/license.php>.
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*
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* Version: $Id: detourhelpers.h 248 2008-08-27 00:56:22Z pred $
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*/
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#ifndef _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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#define _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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#if defined PLATFORM_POSIX
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#include <sys/mman.h>
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#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
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#endif
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#include <amtl/am-bits.h>
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#include <jit/x86/x86_macros.h>
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struct patch_t
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{
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patch_t()
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{
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patch[0] = 0;
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bytes = 0;
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}
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unsigned char patch[20];
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size_t bytes;
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};
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inline void ProtectMemory(void *addr, int length, int prot)
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{
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#if defined PLATFORM_POSIX
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long pageSize = sysconf(_SC_PAGESIZE);
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void *startPage = ke::AlignedBase(addr, pageSize);
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void *endPage = ke::AlignedBase((void *)((intptr_t)addr + length), pageSize);
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mprotect(startPage, ((intptr_t)endPage - (intptr_t)startPage) + pageSize, prot);
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#elif defined PLATFORM_WINDOWS
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DWORD old_prot;
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VirtualProtect(addr, length, prot, &old_prot);
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#endif
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}
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inline void SetMemPatchable(void *address, size_t size)
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{
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ProtectMemory(address, (int)size, PAGE_EXECUTE_READWRITE);
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}
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inline void PatchRelJump32(unsigned char *target, void *callback)
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{
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SetMemPatchable(target, 5);
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// jmp <32-bit displacement>
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target[0] = IA32_JMP_IMM32;
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*(int32_t *)(&target[1]) = int32_t((unsigned char *)callback - (target + 5));
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}
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inline void PatchAbsJump64(unsigned char *target, void *callback)
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{
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int i = 0;
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SetMemPatchable(target, 14);
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// push <lower 32-bits> ; allocates 64-bit stack space on x64
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// mov [rsp+4], <upper 32-bits> ; unnecessary if upper bits are 0
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// ret ; jump to address on stack
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target[i++] = IA32_PUSH_IMM32;
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*(int32_t *)(&target[i]) = int32_t(int64_t(callback));
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i += 4;
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if ((int64_t(callback) >> 32) != 0)
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{
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target[i++] = IA32_MOV_RM_IMM32;
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target[i++] = ia32_modrm(MOD_DISP8, 0, kREG_SIB);
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target[i++] = ia32_sib(NOSCALE, kREG_NOIDX, kREG_ESP);
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target[i++] = 0x04;
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*(int32_t *)(&target[i]) = (int64_t(callback) >> 32);
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i += 4;
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}
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target[i] = IA32_RET;
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}
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inline void DoGatePatch(unsigned char *target, void *callback)
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{
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#if defined(_WIN64) || defined(__x86_64__)
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int64_t diff = int64_t(callback) - (int64_t(target) + 5);
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int32_t upperBits = (diff >> 32);
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if (upperBits == 0 || upperBits == -1)
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PatchRelJump32(target, callback);
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else
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PatchAbsJump64(target, callback);
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#else
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PatchRelJump32(target, callback);
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#endif
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}
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inline void ApplyPatch(void *address, int offset, const patch_t *patch, patch_t *restore)
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{
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unsigned char *addr = (unsigned char *)address + offset;
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SetMemPatchable(addr, patch->bytes);
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if (restore)
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{
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for (size_t i=0; i<patch->bytes; i++)
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{
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restore->patch[i] = addr[i];
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}
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restore->bytes = patch->bytes;
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}
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for (size_t i=0; i<patch->bytes; i++)
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{
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addr[i] = patch->patch[i];
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}
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}
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#endif //_INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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