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MemoryModule.c
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/*
* Memory DLL loading code
* Version 0.0.4
*
* Copyright (c) 2004-2015 by Joachim Bauch / [email protected]
* http://www.joachim-bauch.de
*
* The contents of this file are subject to the Mozilla Public License Version
* 2.0 (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.
*
* Portions created by Joachim Bauch are Copyright (C) 2004-2015
* Joachim Bauch. All Rights Reserved.
*
*
* THeller: Added binary search in MemoryGetProcAddress function
* (#define USE_BINARY_SEARCH to enable it). This gives a very large
* speedup for libraries that exports lots of functions.
*
* These portions are Copyright (C) 2013 Thomas Heller.
*/
#include <windows.h>
#include <winnt.h>
#include <stddef.h>
#include <tchar.h>
#ifdef DEBUG_OUTPUT
#include <stdio.h>
#endif
#if _MSC_VER
// Disable warning about data -> function pointer conversion
#pragma warning(disable:4055)
// C4244: conversion from 'uintptr_t' to 'DWORD', possible loss of data.
#pragma warning(error: 4244)
// C4267: conversion from 'size_t' to 'int', possible loss of data.
#pragma warning(error: 4267)
#define inline __inline
#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
#if defined(_M_IX86)
#define HOST_MACHINE IMAGE_FILE_MACHINE_I386
#elif defined(_M_AMD64)
#define HOST_MACHINE IMAGE_FILE_MACHINE_AMD64
#elif defined(_M_ARM)
#define HOST_MACHINE IMAGE_FILE_MACHINE_ARMNT
#elif defined(_M_ARM64)
#define HOST_MACHINE IMAGE_FILE_MACHINE_ARM64
#else
#error Unsupported architecture
#endif
#include "MemoryModule.h"
struct ExportNameEntry {
LPCSTR name;
WORD idx;
};
typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
typedef int (WINAPI *ExeEntryProc)(void);
#ifdef _WIN64
typedef struct POINTER_LIST {
struct POINTER_LIST *next;
void *address;
} POINTER_LIST;
#endif
typedef struct {
PIMAGE_NT_HEADERS headers;
unsigned char *codeBase;
HCUSTOMMODULE *modules;
int numModules;
BOOL initialized;
BOOL isDLL;
BOOL isRelocated;
CustomAllocFunc alloc;
CustomFreeFunc free;
CustomLoadLibraryFunc loadLibrary;
CustomGetProcAddressFunc getProcAddress;
CustomFreeLibraryFunc freeLibrary;
struct ExportNameEntry *nameExportsTable;
void *userdata;
ExeEntryProc exeEntry;
DWORD pageSize;
#ifdef _WIN64
POINTER_LIST *blockedMemory;
#endif
} MEMORYMODULE, *PMEMORYMODULE;
typedef struct {
LPVOID address;
LPVOID alignedAddress;
SIZE_T size;
DWORD characteristics;
BOOL last;
} SECTIONFINALIZEDATA, *PSECTIONFINALIZEDATA;
#define GET_HEADER_DICTIONARY(module, idx) &(module)->headers->OptionalHeader.DataDirectory[idx]
static inline uintptr_t
AlignValueDown(uintptr_t value, uintptr_t alignment) {
return value & ~(alignment - 1);
}
static inline LPVOID
AlignAddressDown(LPVOID address, uintptr_t alignment) {
return (LPVOID) AlignValueDown((uintptr_t) address, alignment);
}
static inline size_t
AlignValueUp(size_t value, size_t alignment) {
return (value + alignment - 1) & ~(alignment - 1);
}
static inline void*
OffsetPointer(void* data, ptrdiff_t offset) {
return (void*) ((uintptr_t) data + offset);
}
static inline void
OutputLastError(const char *msg)
{
#ifndef DEBUG_OUTPUT
UNREFERENCED_PARAMETER(msg);
#else
char *tmp, *tmpmsg;
FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&tmp, 0, NULL);
tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);
sprintf(tmpmsg, "%s: %s", msg, tmp);
OutputDebugStringA(tmpmsg);
LocalFree(tmpmsg);
LocalFree(tmp);
#endif
}
#ifdef _WIN64
static void
FreePointerList(POINTER_LIST *head, CustomFreeFunc freeMemory, void *userdata)
{
POINTER_LIST *node = head;
while (node) {
POINTER_LIST *next;
freeMemory(node->address, 0, MEM_RELEASE, userdata);
next = node->next;
free(node);
node = next;
}
}
#endif
static BOOL
CheckSize(size_t size, size_t expected) {
if (size < expected) {
SetLastError(ERROR_INVALID_DATA);
return FALSE;
}
return TRUE;
}
static BOOL
CopySections(const unsigned char *data, size_t size, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module)
{
int i, section_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
section_size = old_headers->OptionalHeader.SectionAlignment;
if (section_size > 0) {
dest = (unsigned char *)module->alloc(codeBase + section->VirtualAddress,
section_size,
MEM_COMMIT,
PAGE_READWRITE,
module->userdata);
if (dest == NULL) {
return FALSE;
}
// Always use position from file to support alignments smaller
// than page size (allocation above will align to page size).
dest = codeBase + section->VirtualAddress;
// NOTE: On 64bit systems we truncate to 32bit here but expand
// again later when "PhysicalAddress" is used.
section->Misc.PhysicalAddress = (DWORD) ((uintptr_t) dest & 0xffffffff);
memset(dest, 0, section_size);
}
// section is empty
continue;
}
if (!CheckSize(size, section->PointerToRawData + section->SizeOfRawData)) {
return FALSE;
}
// commit memory block and copy data from dll
dest = (unsigned char *)module->alloc(codeBase + section->VirtualAddress,
section->SizeOfRawData,
MEM_COMMIT,
PAGE_READWRITE,
module->userdata);
if (dest == NULL) {
return FALSE;
}
// Always use position from file to support alignments smaller
// than page size (allocation above will align to page size).
dest = codeBase + section->VirtualAddress;
memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
// NOTE: On 64bit systems we truncate to 32bit here but expand
// again later when "PhysicalAddress" is used.
section->Misc.PhysicalAddress = (DWORD) ((uintptr_t) dest & 0xffffffff);
}
return TRUE;
}
// 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 SIZE_T
GetRealSectionSize(PMEMORYMODULE module, PIMAGE_SECTION_HEADER section) {
DWORD 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;
}
}
return (SIZE_T) size;
}
static BOOL
FinalizeSection(PMEMORYMODULE module, PSECTIONFINALIZEDATA sectionData) {
DWORD protect, oldProtect;
BOOL executable;
BOOL readable;
BOOL writeable;
if (sectionData->size == 0) {
return TRUE;
}
if (sectionData->characteristics & IMAGE_SCN_MEM_DISCARDABLE) {
// section is not needed any more and can safely be freed
if (sectionData->address == sectionData->alignedAddress &&
(sectionData->last ||
module->headers->OptionalHeader.SectionAlignment == module->pageSize ||
(sectionData->size % module->pageSize) == 0)
) {
// Only allowed to decommit whole pages
module->free(sectionData->address, sectionData->size, MEM_DECOMMIT, module->userdata);
}
return TRUE;
}
// determine protection flags based on characteristics
executable = (sectionData->characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
readable = (sectionData->characteristics & IMAGE_SCN_MEM_READ) != 0;
writeable = (sectionData->characteristics & IMAGE_SCN_MEM_WRITE) != 0;
protect = ProtectionFlags[executable][readable][writeable];
if (sectionData->characteristics & IMAGE_SCN_MEM_NOT_CACHED) {
protect |= PAGE_NOCACHE;
}
// change memory access flags
if (VirtualProtect(sectionData->address, sectionData->size, protect, &oldProtect) == 0) {
OutputLastError("Error protecting memory page");
return FALSE;
}
return TRUE;
}
static BOOL
FinalizeSections(PMEMORYMODULE module)
{
int i;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
#ifdef _WIN64
// "PhysicalAddress" might have been truncated to 32bit above, expand to
// 64bits again.
uintptr_t imageOffset = ((uintptr_t) module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);
#else
static const uintptr_t imageOffset = 0;
#endif
SECTIONFINALIZEDATA sectionData;
sectionData.address = (LPVOID)((uintptr_t)section->Misc.PhysicalAddress | imageOffset);
sectionData.alignedAddress = AlignAddressDown(sectionData.address, module->pageSize);
sectionData.size = GetRealSectionSize(module, section);
sectionData.characteristics = section->Characteristics;
sectionData.last = FALSE;
section++;
// loop through all sections and change access flags
for (i=1; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
LPVOID sectionAddress = (LPVOID)((uintptr_t)section->Misc.PhysicalAddress | imageOffset);
LPVOID alignedAddress = AlignAddressDown(sectionAddress, module->pageSize);
SIZE_T sectionSize = GetRealSectionSize(module, section);
// Combine access flags of all sections that share a page
// TODO(fancycode): We currently share flags of a trailing large section
// with the page of a first small section. This should be optimized.
if (sectionData.alignedAddress == alignedAddress || (uintptr_t) sectionData.address + sectionData.size > (uintptr_t) alignedAddress) {
// Section shares page with previous
if ((section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) == 0 || (sectionData.characteristics & IMAGE_SCN_MEM_DISCARDABLE) == 0) {
sectionData.characteristics = (sectionData.characteristics | section->Characteristics) & ~IMAGE_SCN_MEM_DISCARDABLE;
} else {
sectionData.characteristics |= section->Characteristics;
}
sectionData.size = (((uintptr_t)sectionAddress) + ((uintptr_t) sectionSize)) - (uintptr_t) sectionData.address;
continue;
}
if (!FinalizeSection(module, §ionData)) {
return FALSE;
}
sectionData.address = sectionAddress;
sectionData.alignedAddress = alignedAddress;
sectionData.size = sectionSize;
sectionData.characteristics = section->Characteristics;
}
sectionData.last = TRUE;
if (!FinalizeSection(module, §ionData)) {
return FALSE;
}
return TRUE;
}
static BOOL
ExecuteTLS(PMEMORYMODULE module)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_TLS_DIRECTORY tls;
PIMAGE_TLS_CALLBACK* callback;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_TLS);
if (directory->VirtualAddress == 0) {
return TRUE;
}
tls = (PIMAGE_TLS_DIRECTORY) (codeBase + directory->VirtualAddress);
callback = (PIMAGE_TLS_CALLBACK *) tls->AddressOfCallBacks;
if (callback) {
while (*callback) {
(*callback)((LPVOID) codeBase, DLL_PROCESS_ATTACH, NULL);
callback++;
}
}
return TRUE;
}
static BOOL
PerformBaseRelocation(PMEMORYMODULE module, ptrdiff_t delta)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_BASE_RELOCATION relocation;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
if (directory->Size == 0) {
return (delta == 0);
}
relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);
for (; relocation->VirtualAddress > 0; ) {
DWORD i;
unsigned char *dest = codeBase + relocation->VirtualAddress;
unsigned short *relInfo = (unsigned short*) OffsetPointer(relocation, IMAGE_SIZEOF_BASE_RELOCATION);
for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++) {
// the upper 4 bits define the type of relocation
int type = *relInfo >> 12;
// the lower 12 bits define the offset
int offset = *relInfo & 0xfff;
switch (type)
{
case IMAGE_REL_BASED_ABSOLUTE:
// skip relocation
break;
case IMAGE_REL_BASED_LOW:
*(WORD *)(dest + offset) += LOWORD(delta);
break;
case IMAGE_REL_BASED_HIGHLOW:
// change complete 32 bit address
{
DWORD *patchAddrHL = (DWORD *) (dest + offset);
*patchAddrHL += (DWORD) delta;
}
break;
case IMAGE_REL_BASED_DIR64:
{
ULONGLONG *patchAddr64 = (ULONGLONG *) (dest + offset);
*patchAddr64 += (ULONGLONG) delta;
}
break;
case IMAGE_REL_BASED_THUMB_MOV32:
{
DWORD inst = *(DWORD *)(dest + offset);
DWORD imm16 = ((inst << 1) & 0x0800) + ((inst << 12) & 0xf000) +
((inst >> 20) & 0x0700) + ((inst >> 16) & 0x00ff);
DWORD hi_delta;
if ((inst & 0x8000fbf0) != 0x0000f240)
fwprintf(stdout, L"wrong Thumb2 instruction %08x, expected MOVW\n", inst);
imm16 += LOWORD(delta);
hi_delta = HIWORD(delta) + HIWORD(imm16);
*(DWORD *)(dest + offset) = (inst & 0x8f00fbf0) + ((imm16 >> 1) & 0x0400) +
((imm16 >> 12) & 0x000f) +
((imm16 << 20) & 0x70000000) +
((imm16 << 16) & 0xff0000);
if (hi_delta != 0)
{
inst = *(DWORD *)(dest + offset + 4);
imm16 = ((inst << 1) & 0x0800) + ((inst << 12) & 0xf000) +
((inst >> 20) & 0x0700) + ((inst >> 16) & 0x00ff);
if ((inst & 0x8000fbf0) != 0x0000f2c0)
fwprintf(stdout, L"wrong Thumb2 instruction %08x, expected MOVT\n", inst);
imm16 += hi_delta;
if (imm16 > 0xffff)
fwprintf(stdout, L"resulting immediate value won't fit: %08x\n", imm16);
*(DWORD *)(dest + offset + 4) = (inst & 0x8f00fbf0) +
((imm16 >> 1) & 0x0400) +
((imm16 >> 12) & 0x000f) +
((imm16 << 20) & 0x70000000) +
((imm16 << 16) & 0xff0000);
}
}
break;
default:
//printf("Unknown relocation: %d\n", type);
break;
}
}
// advance to next relocation block
relocation = (PIMAGE_BASE_RELOCATION) OffsetPointer(relocation, relocation->SizeOfBlock);
}
return TRUE;
}
static BOOL
BuildImportTable(PMEMORYMODULE module)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_IMPORT_DESCRIPTOR importDesc;
BOOL result = TRUE;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
if (directory->Size == 0) {
return TRUE;
}
importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);
for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {
uintptr_t *thunkRef;
FARPROC *funcRef;
HCUSTOMMODULE *tmp;
HCUSTOMMODULE handle = module->loadLibrary((LPCSTR) (codeBase + importDesc->Name), module->userdata);
if (handle == NULL) {
SetLastError(ERROR_MOD_NOT_FOUND);
result = FALSE;
break;
}
tmp = (HCUSTOMMODULE *) realloc(module->modules, (module->numModules+1)*(sizeof(HCUSTOMMODULE)));
if (tmp == NULL) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_OUTOFMEMORY);
result = FALSE;
break;
}
module->modules = tmp;
module->modules[module->numModules++] = handle;
if (importDesc->OriginalFirstThunk) {
thunkRef = (uintptr_t *) (codeBase + importDesc->OriginalFirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
} else {
// no hint table
thunkRef = (uintptr_t *) (codeBase + importDesc->FirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
}
for (; *thunkRef; thunkRef++, funcRef++) {
if (IMAGE_SNAP_BY_ORDINAL(*thunkRef)) {
*funcRef = module->getProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef), module->userdata);
} else {
PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME) (codeBase + (*thunkRef));
*funcRef = module->getProcAddress(handle, (LPCSTR)&thunkData->Name, module->userdata);
}
if (*funcRef == 0) {
result = FALSE;
break;
}
}
if (!result) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_PROC_NOT_FOUND);
break;
}
}
return result;
}
LPVOID MemoryDefaultAlloc(LPVOID address, SIZE_T size, DWORD allocationType, DWORD protect, void* userdata)
{
UNREFERENCED_PARAMETER(userdata);
return VirtualAlloc(address, size, allocationType, protect);
}
BOOL MemoryDefaultFree(LPVOID lpAddress, SIZE_T dwSize, DWORD dwFreeType, void* userdata)
{
UNREFERENCED_PARAMETER(userdata);
return VirtualFree(lpAddress, dwSize, dwFreeType);
}
HCUSTOMMODULE MemoryDefaultLoadLibrary(LPCSTR filename, void *userdata)
{
HMODULE result;
UNREFERENCED_PARAMETER(userdata);
result = LoadLibraryA(filename);
if (result == NULL) {
return NULL;
}
return (HCUSTOMMODULE) result;
}
FARPROC MemoryDefaultGetProcAddress(HCUSTOMMODULE module, LPCSTR name, void *userdata)
{
UNREFERENCED_PARAMETER(userdata);
return (FARPROC) GetProcAddress((HMODULE) module, name);
}
void MemoryDefaultFreeLibrary(HCUSTOMMODULE module, void *userdata)
{
UNREFERENCED_PARAMETER(userdata);
FreeLibrary((HMODULE) module);
}
HMEMORYMODULE MemoryLoadLibrary(const void *data, size_t size)
{
return MemoryLoadLibraryEx(data, size, MemoryDefaultAlloc, MemoryDefaultFree, MemoryDefaultLoadLibrary, MemoryDefaultGetProcAddress, MemoryDefaultFreeLibrary, NULL);
}
HMEMORYMODULE MemoryLoadLibraryEx(const void *data, size_t size,
CustomAllocFunc allocMemory,
CustomFreeFunc freeMemory,
CustomLoadLibraryFunc loadLibrary,
CustomGetProcAddressFunc getProcAddress,
CustomFreeLibraryFunc freeLibrary,
void *userdata)
{
PMEMORYMODULE result = NULL;
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS old_header;
unsigned char *code, *headers;
ptrdiff_t locationDelta;
SYSTEM_INFO sysInfo;
PIMAGE_SECTION_HEADER section;
DWORD i;
size_t optionalSectionSize;
size_t lastSectionEnd = 0;
size_t alignedImageSize;
#ifdef _WIN64
POINTER_LIST *blockedMemory = NULL;
#endif
if (!CheckSize(size, sizeof(IMAGE_DOS_HEADER))) {
return NULL;
}
dos_header = (PIMAGE_DOS_HEADER)data;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
if (!CheckSize(size, dos_header->e_lfanew + sizeof(IMAGE_NT_HEADERS))) {
return NULL;
}
old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];
if (old_header->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
if (old_header->FileHeader.Machine != HOST_MACHINE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
if (old_header->OptionalHeader.SectionAlignment & 1) {
// Only support section alignments that are a multiple of 2
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
section = IMAGE_FIRST_SECTION(old_header);
optionalSectionSize = old_header->OptionalHeader.SectionAlignment;
for (i=0; i<old_header->FileHeader.NumberOfSections; i++, section++) {
size_t endOfSection;
if (section->SizeOfRawData == 0) {
// Section without data in the DLL
endOfSection = section->VirtualAddress + optionalSectionSize;
} else {
endOfSection = section->VirtualAddress + section->SizeOfRawData;
}
if (endOfSection > lastSectionEnd) {
lastSectionEnd = endOfSection;
}
}
alignedImageSize = AlignValueUp(old_header->OptionalHeader.SizeOfImage, old_header->OptionalHeader.SectionAlignment);
if (alignedImageSize != AlignValueUp(lastSectionEnd, old_header->OptionalHeader.SectionAlignment)) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
// reserve memory for image of library
// XXX: is it correct to commit the complete memory region at once?
// calling DllEntry raises an exception if we don't...
code = (unsigned char *)allocMemory((LPVOID)(old_header->OptionalHeader.ImageBase),
alignedImageSize,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE,
userdata);
if (code == NULL) {
// try to allocate memory at arbitrary position
code = (unsigned char *)allocMemory(NULL,
alignedImageSize,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE,
userdata);
if (code == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
}
#ifdef _WIN64
// Memory block may not span 4 GB boundaries.
while ((((uintptr_t) code) >> 32) < (((uintptr_t) (code + alignedImageSize)) >> 32)) {
POINTER_LIST *node = (POINTER_LIST*) malloc(sizeof(POINTER_LIST));
if (!node) {
freeMemory(code, 0, MEM_RELEASE, userdata);
FreePointerList(blockedMemory, freeMemory, userdata);
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
node->next = blockedMemory;
node->address = code;
blockedMemory = node;
code = (unsigned char *)allocMemory(NULL,
alignedImageSize,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE,
userdata);
if (code == NULL) {
FreePointerList(blockedMemory, freeMemory, userdata);
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
}
#endif
result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MEMORYMODULE));
if (result == NULL) {
freeMemory(code, 0, MEM_RELEASE, userdata);
#ifdef _WIN64
FreePointerList(blockedMemory, freeMemory, userdata);
#endif
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
result->codeBase = code;
result->isDLL = (old_header->FileHeader.Characteristics & IMAGE_FILE_DLL) != 0;
result->alloc = allocMemory;
result->free = freeMemory;
result->loadLibrary = loadLibrary;
result->getProcAddress = getProcAddress;
result->freeLibrary = freeLibrary;
result->userdata = userdata;
result->pageSize = sysInfo.dwPageSize;
#ifdef _WIN64
result->blockedMemory = blockedMemory;
#endif
if (!CheckSize(size, old_header->OptionalHeader.SizeOfHeaders)) {
goto error;
}
// commit memory for headers
headers = (unsigned char *)allocMemory(code,
old_header->OptionalHeader.SizeOfHeaders,
MEM_COMMIT,
PAGE_READWRITE,
userdata);
// copy PE header to code
memcpy(headers, dos_header, old_header->OptionalHeader.SizeOfHeaders);
result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
// update position
result->headers->OptionalHeader.ImageBase = (uintptr_t)code;
// copy sections from DLL file block to new memory location
if (!CopySections((const unsigned char *) data, size, old_header, result)) {
goto error;
}
// adjust base address of imported data
locationDelta = (ptrdiff_t)(result->headers->OptionalHeader.ImageBase - old_header->OptionalHeader.ImageBase);
if (locationDelta != 0) {
result->isRelocated = PerformBaseRelocation(result, locationDelta);
} else {
result->isRelocated = TRUE;
}
// 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"
if (!FinalizeSections(result)) {
goto error;
}
// TLS callbacks are executed BEFORE the main loading
if (!ExecuteTLS(result)) {
goto error;
}
// get entry point of loaded library
if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {
if (result->isDLL) {
DllEntryProc DllEntry = (DllEntryProc)(LPVOID)(code + result->headers->OptionalHeader.AddressOfEntryPoint);
// notify library about attaching to process
BOOL successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
if (!successfull) {
SetLastError(ERROR_DLL_INIT_FAILED);
goto error;
}
result->initialized = TRUE;
} else {
result->exeEntry = (ExeEntryProc)(LPVOID)(code + result->headers->OptionalHeader.AddressOfEntryPoint);
}
} else {
result->exeEntry = NULL;
}
return (HMEMORYMODULE)result;
error:
// cleanup
MemoryFreeLibrary(result);
return NULL;
}
static int _compare(const void *a, const void *b)
{
const struct ExportNameEntry *p1 = (const struct ExportNameEntry*) a;
const struct ExportNameEntry *p2 = (const struct ExportNameEntry*) b;
return strcmp(p1->name, p2->name);
}
static int _find(const void *a, const void *b)
{
LPCSTR *name = (LPCSTR *) a;
const struct ExportNameEntry *p = (const struct ExportNameEntry*) b;
return strcmp(*name, p->name);
}
FARPROC MemoryGetProcAddress(HMEMORYMODULE mod, LPCSTR name)
{
PMEMORYMODULE module = (PMEMORYMODULE)mod;
unsigned char *codeBase = module->codeBase;
DWORD idx = 0;
PIMAGE_EXPORT_DIRECTORY exports;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_EXPORT);
if (directory->Size == 0) {
// no export table found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
exports = (PIMAGE_EXPORT_DIRECTORY) (codeBase + directory->VirtualAddress);
if (exports->NumberOfFunctions == 0) {
// DLL doesn't export anything
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if (HIWORD(name) == 0) {
// load function by ordinal value
if (LOWORD(name) < exports->Base) {
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
idx = LOWORD(name) - exports->Base;
} else if (!exports->NumberOfNames) {
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
} else {
const struct ExportNameEntry *found;
// Lazily build name table and sort it by names
if (!module->nameExportsTable) {
DWORD i;
DWORD *nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
WORD *ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
struct ExportNameEntry *entry = (struct ExportNameEntry*) malloc(exports->NumberOfNames * sizeof(struct ExportNameEntry));
module->nameExportsTable = entry;
if (!entry) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++, entry++) {
entry->name = (const char *) (codeBase + (*nameRef));
entry->idx = *ordinal;
}
qsort(module->nameExportsTable,
exports->NumberOfNames,
sizeof(struct ExportNameEntry), _compare);
}
// search function name in list of exported names with binary search
found = (const struct ExportNameEntry*) bsearch(&name,
module->nameExportsTable,
exports->NumberOfNames,
sizeof(struct ExportNameEntry), _find);
if (!found) {
// exported symbol not found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
idx = found->idx;
}
if (idx > exports->NumberOfFunctions) {
// name <-> ordinal number don't match
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
// AddressOfFunctions contains the RVAs to the "real" functions
return (FARPROC)(LPVOID)(codeBase + (*(DWORD *) (codeBase + exports->AddressOfFunctions + (idx*4))));
}
void MemoryFreeLibrary(HMEMORYMODULE mod)
{
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module == NULL) {
return;
}
if (module->initialized) {
// notify library about detaching from process
DllEntryProc DllEntry = (DllEntryProc)(LPVOID)(module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
}
free(module->nameExportsTable);
if (module->modules != NULL) {
// free previously opened libraries
int i;
for (i=0; i<module->numModules; i++) {
if (module->modules[i] != NULL) {
module->freeLibrary(module->modules[i], module->userdata);
}
}
free(module->modules);
}
if (module->codeBase != NULL) {
// release memory of library
module->free(module->codeBase, 0, MEM_RELEASE, module->userdata);
}
#ifdef _WIN64
FreePointerList(module->blockedMemory, module->free, module->userdata);
#endif
HeapFree(GetProcessHeap(), 0, module);
}
int MemoryCallEntryPoint(HMEMORYMODULE mod)
{
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module == NULL || module->isDLL || module->exeEntry == NULL || !module->isRelocated) {
return -1;
}
return module->exeEntry();
}
#define DEFAULT_LANGUAGE MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL)
HMEMORYRSRC MemoryFindResource(HMEMORYMODULE module, LPCTSTR name, LPCTSTR type)
{
return MemoryFindResourceEx(module, name, type, DEFAULT_LANGUAGE);
}
static PIMAGE_RESOURCE_DIRECTORY_ENTRY _MemorySearchResourceEntry(
void *root,
PIMAGE_RESOURCE_DIRECTORY resources,
LPCTSTR key)
{
PIMAGE_RESOURCE_DIRECTORY_ENTRY entries = (PIMAGE_RESOURCE_DIRECTORY_ENTRY) (resources + 1);
PIMAGE_RESOURCE_DIRECTORY_ENTRY result = NULL;
DWORD start;
DWORD end;
DWORD middle;
if (!IS_INTRESOURCE(key) && key[0] == TEXT('#')) {
// special case: resource id given as string
TCHAR *endpos = NULL;
long int tmpkey = (WORD) _tcstol((TCHAR *) &key[1], &endpos, 10);
if (tmpkey <= 0xffff && lstrlen(endpos) == 0) {
key = MAKEINTRESOURCE(tmpkey);
}
}
// entries are stored as ordered list of named entries,
// followed by an ordered list of id entries - we can do
// a binary search to find faster...
if (IS_INTRESOURCE(key)) {
WORD check = (WORD) (uintptr_t) key;
start = resources->NumberOfNamedEntries;
end = start + resources->NumberOfIdEntries;
while (end > start) {
WORD entryName;
middle = (start + end) >> 1;
entryName = (WORD) entries[middle].Name;
if (check < entryName) {
end = (end != middle ? middle : middle-1);
} else if (check > entryName) {
start = (start != middle ? middle : middle+1);
} else {
result = &entries[middle];
break;
}
}
} else {
LPCWSTR searchKey;
size_t searchKeyLen = _tcslen(key);
#if defined(UNICODE)