471 lines
13 KiB
C
471 lines
13 KiB
C
/*
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* Memory DLL loading code
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* Version 0.0.2
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*
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* Copyright (c) 2004-2005 by Joachim Bauch / mail@joachim-bauch.de
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* http://www.joachim-bauch.de
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is MemoryModule.c
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*
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* The Initial Developer of the Original Code is Joachim Bauch.
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*
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* Portions created by Joachim Bauch are Copyright (C) 2004-2005
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* Joachim Bauch. All Rights Reserved.
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*
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*/
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// disable warnings about pointer <-> DWORD conversions
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#pragma warning( disable : 4311 4312 )
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#include <Windows.h>
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#include <winnt.h>
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#ifdef DEBUG_OUTPUT
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#include <stdio.h>
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#endif
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#include "MemoryModule.h"
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typedef struct {
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PIMAGE_NT_HEADERS headers;
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unsigned char *codeBase;
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HMODULE *modules;
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int numModules;
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int initialized;
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} MEMORYMODULE, *PMEMORYMODULE;
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typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
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#define GET_HEADER_DICTIONARY(module, idx) &(module)->headers->OptionalHeader.DataDirectory[idx]
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#ifdef DEBUG_OUTPUT
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static void
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OutputLastError(const char *msg)
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{
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LPVOID tmp;
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char *tmpmsg;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&tmp, 0, NULL);
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tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);
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sprintf(tmpmsg, "%s: %s", msg, tmp);
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OutputDebugString(tmpmsg);
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LocalFree(tmpmsg);
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LocalFree(tmp);
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}
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#endif
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static void
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CopySections(const unsigned char *data, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module)
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{
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int i, size;
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unsigned char *codeBase = module->codeBase;
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unsigned char *dest;
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PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
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for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++)
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{
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if (section->SizeOfRawData == 0)
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{
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// section doesn't contain data in the dll itself, but may define
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// uninitialized data
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size = old_headers->OptionalHeader.SectionAlignment;
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if (size > 0)
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{
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dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
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size,
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MEM_COMMIT,
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PAGE_READWRITE);
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section->Misc.PhysicalAddress = (DWORD)dest;
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memset(dest, 0, size);
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}
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// section is empty
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continue;
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}
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// commit memory block and copy data from dll
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dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
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section->SizeOfRawData,
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MEM_COMMIT,
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PAGE_READWRITE);
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memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
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section->Misc.PhysicalAddress = (DWORD)dest;
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}
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}
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// Protection flags for memory pages (Executable, Readable, Writeable)
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static int ProtectionFlags[2][2][2] = {
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{
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// not executable
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{PAGE_NOACCESS, PAGE_WRITECOPY},
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{PAGE_READONLY, PAGE_READWRITE},
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}, {
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// executable
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{PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY},
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{PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE},
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},
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};
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static void
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FinalizeSections(PMEMORYMODULE module)
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{
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int i;
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PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
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// loop through all sections and change access flags
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for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++)
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{
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DWORD protect, oldProtect, size;
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int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
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int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;
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int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;
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if (section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE)
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{
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// section is not needed any more and can safely be freed
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VirtualFree((LPVOID)section->Misc.PhysicalAddress, section->SizeOfRawData, MEM_DECOMMIT);
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continue;
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}
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// determine protection flags based on characteristics
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protect = ProtectionFlags[executable][readable][writeable];
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if (section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED)
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protect |= PAGE_NOCACHE;
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// determine size of region
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size = section->SizeOfRawData;
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if (size == 0)
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{
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if (section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
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size = module->headers->OptionalHeader.SizeOfInitializedData;
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else if (section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
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size = module->headers->OptionalHeader.SizeOfUninitializedData;
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}
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if (size > 0)
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{
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// change memory access flags
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if (VirtualProtect((LPVOID)section->Misc.PhysicalAddress, section->SizeOfRawData, protect, &oldProtect) == 0)
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#ifdef DEBUG_OUTPUT
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OutputLastError("Error protecting memory page")
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#endif
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;
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}
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}
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}
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#define IMAGE_SIZEOF_BASE_RELOCATION 8
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static void
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PerformBaseRelocation(PMEMORYMODULE module, DWORD delta)
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{
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DWORD i;
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unsigned char *codeBase = module->codeBase;
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
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if (directory->Size > 0)
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{
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PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION)(codeBase + directory->VirtualAddress);
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for (; relocation->VirtualAddress > 0; )
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{
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unsigned char *dest = (unsigned char *)(codeBase + relocation->VirtualAddress);
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unsigned short *relInfo = (unsigned short *)((unsigned char *)relocation + IMAGE_SIZEOF_BASE_RELOCATION);
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for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++)
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{
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DWORD *patchAddrHL;
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int type, offset;
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// the upper 4 bits define the type of relocation
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type = *relInfo >> 12;
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// the lower 12 bits define the offset
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offset = *relInfo & 0xfff;
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switch (type)
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{
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case IMAGE_REL_BASED_ABSOLUTE:
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// skip relocation
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break;
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case IMAGE_REL_BASED_HIGHLOW:
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// change complete 32 bit address
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patchAddrHL = (DWORD *)(dest + offset);
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*patchAddrHL += delta;
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break;
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default:
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//printf("Unknown relocation: %d\n", type);
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break;
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}
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}
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// advance to next relocation block
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relocation = (PIMAGE_BASE_RELOCATION)(((DWORD)relocation) + relocation->SizeOfBlock);
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}
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}
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}
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static int
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BuildImportTable(PMEMORYMODULE module)
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{
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int result=1;
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unsigned char *codeBase = module->codeBase;
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
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if (directory->Size > 0)
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{
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PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR)(codeBase + directory->VirtualAddress);
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for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++)
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{
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DWORD *thunkRef, *funcRef;
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HMODULE handle = LoadLibrary((LPCSTR)(codeBase + importDesc->Name));
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if (handle == INVALID_HANDLE_VALUE)
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{
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#if DEBUG_OUTPUT
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OutputLastError("Can't load library");
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#endif
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result = 0;
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break;
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}
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module->modules = (HMODULE *)realloc(module->modules, (module->numModules+1)*(sizeof(HMODULE)));
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if (module->modules == NULL)
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{
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result = 0;
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break;
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}
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module->modules[module->numModules++] = handle;
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if (importDesc->OriginalFirstThunk)
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{
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thunkRef = (DWORD *)(codeBase + importDesc->OriginalFirstThunk);
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funcRef = (DWORD *)(codeBase + importDesc->FirstThunk);
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} else {
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// no hint table
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thunkRef = (DWORD *)(codeBase + importDesc->FirstThunk);
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funcRef = (DWORD *)(codeBase + importDesc->FirstThunk);
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}
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for (; *thunkRef; thunkRef++, funcRef++)
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{
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if IMAGE_SNAP_BY_ORDINAL(*thunkRef)
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*funcRef = (DWORD)GetProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef));
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else {
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PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME)(codeBase + *thunkRef);
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*funcRef = (DWORD)GetProcAddress(handle, (LPCSTR)&thunkData->Name);
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}
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if (*funcRef == 0)
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{
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result = 0;
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break;
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}
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}
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if (!result)
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break;
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}
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}
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return result;
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}
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HMEMORYMODULE MemoryLoadLibrary(const void *data)
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{
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PMEMORYMODULE result;
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PIMAGE_DOS_HEADER dos_header;
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PIMAGE_NT_HEADERS old_header;
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unsigned char *code, *headers;
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DWORD locationDelta;
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DllEntryProc DllEntry;
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BOOL successfull;
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dos_header = (PIMAGE_DOS_HEADER)data;
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if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
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{
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#if DEBUG_OUTPUT
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OutputDebugString("Not a valid executable file.\n");
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#endif
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return NULL;
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}
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old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];
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if (old_header->Signature != IMAGE_NT_SIGNATURE)
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{
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#if DEBUG_OUTPUT
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OutputDebugString("No PE header found.\n");
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#endif
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return NULL;
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}
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// reserve memory for image of library
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code = (unsigned char *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase),
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old_header->OptionalHeader.SizeOfImage,
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MEM_RESERVE,
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PAGE_READWRITE);
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if (code == NULL)
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// try to allocate memory at arbitrary position
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code = (unsigned char *)VirtualAlloc(NULL,
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old_header->OptionalHeader.SizeOfImage,
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MEM_RESERVE,
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PAGE_READWRITE);
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if (code == NULL)
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{
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#if DEBUG_OUTPUT
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OutputLastError("Can't reserve memory");
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#endif
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return NULL;
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}
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result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), 0, sizeof(MEMORYMODULE));
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result->codeBase = code;
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result->numModules = 0;
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result->modules = NULL;
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result->initialized = 0;
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// XXX: is it correct to commit the complete memory region at once?
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// calling DllEntry raises an exception if we don't...
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VirtualAlloc(code,
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old_header->OptionalHeader.SizeOfImage,
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MEM_COMMIT,
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PAGE_READWRITE);
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// commit memory for headers
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headers = (unsigned char *)VirtualAlloc(code,
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old_header->OptionalHeader.SizeOfHeaders,
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MEM_COMMIT,
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PAGE_READWRITE);
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// copy PE header to code
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memcpy(headers, dos_header, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders);
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result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
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// update position
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result->headers->OptionalHeader.ImageBase = (DWORD)code;
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// copy sections from DLL file block to new memory location
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CopySections(data, old_header, result);
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// adjust base address of imported data
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locationDelta = (DWORD)(code - old_header->OptionalHeader.ImageBase);
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if (locationDelta != 0)
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PerformBaseRelocation(result, locationDelta);
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// load required dlls and adjust function table of imports
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if (!BuildImportTable(result))
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goto error;
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// mark memory pages depending on section headers and release
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// sections that are marked as "discardable"
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FinalizeSections(result);
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// get entry point of loaded library
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if (result->headers->OptionalHeader.AddressOfEntryPoint != 0)
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{
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DllEntry = (DllEntryProc)(code + result->headers->OptionalHeader.AddressOfEntryPoint);
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if (DllEntry == 0)
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{
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#if DEBUG_OUTPUT
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OutputDebugString("Library has no entry point.\n");
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#endif
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goto error;
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}
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// notify library about attaching to process
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successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
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if (!successfull)
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{
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#if DEBUG_OUTPUT
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OutputDebugString("Can't attach library.\n");
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#endif
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goto error;
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}
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result->initialized = 1;
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}
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return (HMEMORYMODULE)result;
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error:
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// cleanup
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MemoryFreeLibrary(result);
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return NULL;
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}
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FARPROC MemoryGetProcAddress(HMEMORYMODULE module, const char *name)
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{
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unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;
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int idx=-1;
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DWORD i, *nameRef;
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WORD *ordinal;
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PIMAGE_EXPORT_DIRECTORY exports;
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PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE)module, IMAGE_DIRECTORY_ENTRY_EXPORT);
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if (directory->Size == 0)
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// no export table found
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return NULL;
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exports = (PIMAGE_EXPORT_DIRECTORY)(codeBase + directory->VirtualAddress);
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if (exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0)
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// DLL doesn't export anything
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return NULL;
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// search function name in list of exported names
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nameRef = (DWORD *)(codeBase + exports->AddressOfNames);
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ordinal = (WORD *)(codeBase + exports->AddressOfNameOrdinals);
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for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++)
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if (stricmp(name, (const char *)(codeBase + *nameRef)) == 0)
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{
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idx = *ordinal;
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break;
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}
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if (idx == -1)
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// exported symbol not found
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return NULL;
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if ((DWORD)idx > exports->NumberOfFunctions)
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// name <-> ordinal number don't match
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return NULL;
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// AddressOfFunctions contains the RVAs to the "real" functions
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return (FARPROC)(codeBase + *(DWORD *)(codeBase + exports->AddressOfFunctions + (idx*4)));
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}
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void MemoryFreeLibrary(HMEMORYMODULE mod)
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{
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int i;
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PMEMORYMODULE module = (PMEMORYMODULE)mod;
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if (module != NULL)
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{
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if (module->initialized != 0)
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{
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// notify library about detaching from process
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DllEntryProc DllEntry = (DllEntryProc)(module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
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(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
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module->initialized = 0;
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}
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if (module->modules != NULL)
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{
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// free previously opened libraries
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for (i=0; i<module->numModules; i++)
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if (module->modules[i] != INVALID_HANDLE_VALUE)
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FreeLibrary(module->modules[i]);
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free(module->modules);
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}
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if (module->codeBase != NULL)
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// release memory of library
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VirtualFree(module->codeBase, 0, MEM_RELEASE);
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HeapFree(GetProcessHeap(), 0, module);
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}
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}
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