MemoryModule/MemoryModule.c at master · Niblitlvl50/MemoryModule · GitHub

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* Memory DLL loading code

* Version 0.0.3

* http://www.joachim-bauch.de

* The contents of this file are subject to the Mozilla Public License Version

* 1.1 (the "License"); you may not use this file except in compliance with

* the License. You may obtain a copy of the License at

* http://www.mozilla.org/MPL/

* Software distributed under the License is distributed on an "AS IS" basis,

* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

* for the specific language governing rights and limitations under the

* License.

* The Original Code is MemoryModule.c

* The Initial Developer of the Original Code is Joachim Bauch.

#ifndef __GNUC__

// disable warnings about pointer <-> DWORD conversions

#pragma warning( disable : 4311 4312 )

#endif

#ifdef _WIN64

#define POINTER_TYPE ULONGLONG

#else

#define POINTER_TYPE DWORD

#endif

#include <Windows.h>

#include <winnt.h>

#ifdef DEBUG_OUTPUT

#include <stdio.h>

#endif

#ifndef IMAGE_SIZEOF_BASE_RELOCATION

// Vista SDKs no longer define IMAGE_SIZEOF_BASE_RELOCATION!?

#define IMAGE_SIZEOF_BASE_RELOCATION (sizeof(IMAGE_BASE_RELOCATION))

#endif

#include "MemoryModule.h"

typedef struct {

PIMAGE_NT_HEADERS headers;

unsigned char *codeBase;

HMODULE *modules;

int numModules;

int initialized;

} MEMORYMODULE, *PMEMORYMODULE;

typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);

#define GET_HEADER_DICTIONARY(module, idx) &(module)->headers->OptionalHeader.DataDirectory[idx]

#ifdef DEBUG_OUTPUT

static void

OutputLastError(const char *msg)

{

LPVOID tmp;

char *tmpmsg;

FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,

NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&tmp, 0, NULL);

tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);

sprintf(tmpmsg, "%s: %s", msg, tmp);

OutputDebugString(tmpmsg);

LocalFree(tmpmsg);

LocalFree(tmp);

}

#endif

static void

CopySections(const unsigned char *data, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module)

{

int i, size;

unsigned char *codeBase = module->codeBase;

unsigned char *dest;

PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);

for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {

if (section->SizeOfRawData == 0) {

// section doesn't contain data in the dll itself, but may define

// uninitialized data

size = old_headers->OptionalHeader.SectionAlignment;

if (size > 0) {

dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,

size,

MEM_COMMIT,

PAGE_READWRITE);

section->Misc.PhysicalAddress = (POINTER_TYPE)dest;

memset(dest, 0, size);

}

// section is empty

continue;

}

// commit memory block and copy data from dll

dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,

section->SizeOfRawData,

MEM_COMMIT,

PAGE_READWRITE);

memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);

section->Misc.PhysicalAddress = (POINTER_TYPE)dest;

}

// Protection flags for memory pages (Executable, Readable, Writeable)

static int ProtectionFlags[2][2][2] = {

{

// not executable

{PAGE_NOACCESS, PAGE_WRITECOPY},

{PAGE_READONLY, PAGE_READWRITE},

}, {

// executable

{PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY},

{PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE},

};

static void

FinalizeSections(PMEMORYMODULE module)

{

int i;

PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);

#ifdef _WIN64

POINTER_TYPE imageOffset = (module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);

#else

#define imageOffset 0

#endif

// loop through all sections and change access flags

for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {

DWORD protect, oldProtect, size;

int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;

int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;

int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;

if (section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) {

// section is not needed any more and can safely be freed

VirtualFree((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), section->SizeOfRawData, MEM_DECOMMIT);

continue;

}

// determine protection flags based on characteristics

protect = ProtectionFlags[executable][readable][writeable];

if (section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED) {

protect |= PAGE_NOCACHE;

}

// determine size of region

size = section->SizeOfRawData;

if (size == 0) {

if (section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA) {

size = module->headers->OptionalHeader.SizeOfInitializedData;

} else if (section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) {

size = module->headers->OptionalHeader.SizeOfUninitializedData;

}

if (size > 0) {

// change memory access flags

if (VirtualProtect((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), size, protect, &oldProtect) == 0)

#ifdef DEBUG_OUTPUT

OutputLastError("Error protecting memory page")

#endif

;

}

#ifndef _WIN64

#undef imageOffset

#endif

}

static void

PerformBaseRelocation(PMEMORYMODULE module, SIZE_T delta)

{

DWORD i;

unsigned char *codeBase = module->codeBase;

PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);

if (directory->Size > 0) {

PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);

for (; relocation->VirtualAddress > 0; ) {

unsigned char *dest = codeBase + relocation->VirtualAddress;

unsigned short *relInfo = (unsigned short *)((unsigned char *)relocation + IMAGE_SIZEOF_BASE_RELOCATION);

for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++) {

DWORD *patchAddrHL;

#ifdef _WIN64

ULONGLONG *patchAddr64;

#endif

int type, offset;

// the upper 4 bits define the type of relocation

type = *relInfo >> 12;

// the lower 12 bits define the offset

offset = *relInfo & 0xfff;

switch (type)

{

case IMAGE_REL_BASED_ABSOLUTE:

// skip relocation

break;

case IMAGE_REL_BASED_HIGHLOW:

// change complete 32 bit address

patchAddrHL = (DWORD *) (dest + offset);

*patchAddrHL += delta;

break;

#ifdef _WIN64

case IMAGE_REL_BASED_DIR64:

patchAddr64 = (ULONGLONG *) (dest + offset);

*patchAddr64 += delta;

break;

#endif

default:

//printf("Unknown relocation: %d\n", type);

break;

}

// advance to next relocation block

relocation = (PIMAGE_BASE_RELOCATION) (((char *) relocation) + relocation->SizeOfBlock);

}

static int

BuildImportTable(PMEMORYMODULE module)

{

int result=1;

unsigned char *codeBase = module->codeBase;

PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);

if (directory->Size > 0) {

PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);

for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {

POINTER_TYPE *thunkRef;

FARPROC *funcRef;

HMODULE handle = LoadLibrary((LPCSTR) (codeBase + importDesc->Name));

if (handle == NULL) {

#if DEBUG_OUTPUT

OutputLastError("Can't load library");

#endif

result = 0;

break;

}

module->modules = (HMODULE *)realloc(module->modules, (module->numModules+1)*(sizeof(HMODULE)));

if (module->modules == NULL) {

result = 0;

break;

}

module->modules[module->numModules++] = handle;

if (importDesc->OriginalFirstThunk) {

thunkRef = (POINTER_TYPE *) (codeBase + importDesc->OriginalFirstThunk);

funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);

} else {

// no hint table

thunkRef = (POINTER_TYPE *) (codeBase + importDesc->FirstThunk);

funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);

}

for (; *thunkRef; thunkRef++, funcRef++) {

if (IMAGE_SNAP_BY_ORDINAL(*thunkRef)) {

*funcRef = (FARPROC)GetProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef));

} else {

PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME) (codeBase + (*thunkRef));

*funcRef = (FARPROC)GetProcAddress(handle, (LPCSTR)&thunkData->Name);

}

if (*funcRef == 0) {

result = 0;

break;

}

if (!result) {

break;

}

return result;

}

HMEMORYMODULE MemoryLoadLibrary(const void *data)

{

PMEMORYMODULE result;

PIMAGE_DOS_HEADER dos_header;

PIMAGE_NT_HEADERS old_header;

unsigned char *code, *headers;

SIZE_T locationDelta;

DllEntryProc DllEntry;

BOOL successfull;

dos_header = (PIMAGE_DOS_HEADER)data;

if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {

#if DEBUG_OUTPUT

OutputDebugString("Not a valid executable file.\n");

#endif

return NULL;

}

old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];

if (old_header->Signature != IMAGE_NT_SIGNATURE) {

#if DEBUG_OUTPUT

OutputDebugString("No PE header found.\n");

#endif

return NULL;

}

// reserve memory for image of library

code = (unsigned char *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase),

old_header->OptionalHeader.SizeOfImage,

MEM_RESERVE,

PAGE_READWRITE);

if (code == NULL) {

// try to allocate memory at arbitrary position

code = (unsigned char *)VirtualAlloc(NULL,

old_header->OptionalHeader.SizeOfImage,

MEM_RESERVE,

PAGE_READWRITE);

if (code == NULL) {

#if DEBUG_OUTPUT

OutputLastError("Can't reserve memory");

#endif

return NULL;

}

result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), 0, sizeof(MEMORYMODULE));

result->codeBase = code;

result->numModules = 0;

result->modules = NULL;

result->initialized = 0;

// XXX: is it correct to commit the complete memory region at once?

// calling DllEntry raises an exception if we don't...

VirtualAlloc(code,

old_header->OptionalHeader.SizeOfImage,

MEM_COMMIT,

PAGE_READWRITE);

// commit memory for headers

headers = (unsigned char *)VirtualAlloc(code,

old_header->OptionalHeader.SizeOfHeaders,

MEM_COMMIT,

PAGE_READWRITE);

// copy PE header to code

memcpy(headers, dos_header, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders);

result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];

// update position

result->headers->OptionalHeader.ImageBase = (POINTER_TYPE)code;

// copy sections from DLL file block to new memory location

CopySections(data, old_header, result);

// adjust base address of imported data

locationDelta = (SIZE_T)(code - old_header->OptionalHeader.ImageBase);

if (locationDelta != 0) {

PerformBaseRelocation(result, locationDelta);

}

// load required dlls and adjust function table of imports

if (!BuildImportTable(result)) {

goto error;

}

// mark memory pages depending on section headers and release

// sections that are marked as "discardable"

FinalizeSections(result);

// get entry point of loaded library

if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {

DllEntry = (DllEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);

if (DllEntry == 0) {

#if DEBUG_OUTPUT

OutputDebugString("Library has no entry point.\n");

#endif

goto error;

}

// notify library about attaching to process

successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);

if (!successfull) {

#if DEBUG_OUTPUT

OutputDebugString("Can't attach library.\n");

#endif

goto error;

}

result->initialized = 1;

}

return (HMEMORYMODULE)result;

error:

// cleanup

MemoryFreeLibrary(result);

return NULL;

}

FARPROC MemoryGetProcAddress(HMEMORYMODULE module, const char *name)

{

unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;

int idx=-1;

DWORD i, *nameRef;

WORD *ordinal;

PIMAGE_EXPORT_DIRECTORY exports;

PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE)module, IMAGE_DIRECTORY_ENTRY_EXPORT);

if (directory->Size == 0) {

// no export table found

return NULL;

}

exports = (PIMAGE_EXPORT_DIRECTORY) (codeBase + directory->VirtualAddress);

if (exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0) {

// DLL doesn't export anything

return NULL;

}

// search function name in list of exported names

nameRef = (DWORD *) (codeBase + exports->AddressOfNames);

ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);

for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {

if (stricmp(name, (const char *) (codeBase + (*nameRef))) == 0) {

idx = *ordinal;

break;

}

if (idx == -1) {

// exported symbol not found

return NULL;

}

if ((DWORD)idx > exports->NumberOfFunctions) {

// name <-> ordinal number don't match

return NULL;

}

// AddressOfFunctions contains the RVAs to the "real" functions

return (FARPROC) (codeBase + (*(DWORD *) (codeBase + exports->AddressOfFunctions + (idx*4))));

}

void MemoryFreeLibrary(HMEMORYMODULE mod)

{

int i;

PMEMORYMODULE module = (PMEMORYMODULE)mod;

if (module != NULL) {

if (module->initialized != 0) {

// notify library about detaching from process

DllEntryProc DllEntry = (DllEntryProc) (module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);

(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);

module->initialized = 0;

}

if (module->modules != NULL) {

// free previously opened libraries

for (i=0; i<module->numModules; i++) {

if (module->modules[i] != INVALID_HANDLE_VALUE) {

FreeLibrary(module->modules[i]);

}

free(module->modules);

}

if (module->codeBase != NULL) {

// release memory of library

VirtualFree(module->codeBase, 0, MEM_RELEASE);

}

HeapFree(GetProcessHeap(), 0, module);

}

MemoryModule/MemoryModule.c at master · Niblitlvl50/MemoryModule · GitHub

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