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Loader.cpp
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310 lines (246 loc) · 8.99 KB
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#include "stdafx.h"
#include <cmath>
#ifdef _USRDLL
#if (defined(_WIN64) || defined(_M_ARM))
#pragma comment(linker,"/export:LdrUnloadDllMemoryAndExitThread")
#pragma comment(linker,"/export:FreeLibraryMemoryAndExitThread=LdrUnloadDllMemoryAndExitThread")
#else
#pragma comment(linker,"/export:LdrUnloadDllMemoryAndExitThread=_LdrUnloadDllMemoryAndExitThread@8")
#pragma comment(linker,"/export:FreeLibraryMemoryAndExitThread=_LdrUnloadDllMemoryAndExitThread@8")
#endif
#endif
NTSTATUS NTAPI LdrMapDllMemory(
_In_ HMEMORYMODULE ViewBase,
_In_ DWORD dwFlags,
_In_opt_ PCWSTR DllName,
_In_opt_ PCWSTR lpFullDllName,
_Out_opt_ PLDR_DATA_TABLE_ENTRY* DataTableEntry) {
UNICODE_STRING FullDllName, BaseDllName;
PIMAGE_NT_HEADERS NtHeaders;
PLDR_DATA_TABLE_ENTRY LdrEntry;
HANDLE heap = NtCurrentPeb()->ProcessHeap;
if (!(NtHeaders = RtlImageNtHeader(ViewBase))) return STATUS_INVALID_IMAGE_FORMAT;
if (!(LdrEntry = RtlAllocateDataTableEntry(ViewBase))) return STATUS_NO_MEMORY;
if (!NT_SUCCESS(RtlResolveDllNameUnicodeString(DllName, lpFullDllName, &BaseDllName, &FullDllName))) {
RtlFreeHeap(heap, 0, LdrEntry);
return STATUS_NO_MEMORY;
}
if (!RtlInitializeLdrDataTableEntry(LdrEntry, dwFlags, ViewBase, BaseDllName, FullDllName)) {
RtlFreeHeap(heap, 0, LdrEntry);
RtlFreeHeap(heap, 0, BaseDllName.Buffer);
RtlFreeHeap(heap, 0, FullDllName.Buffer);
return STATUS_UNSUCCESSFUL;
}
RtlInsertMemoryTableEntry(LdrEntry);
if (DataTableEntry)*DataTableEntry = LdrEntry;
return STATUS_SUCCESS;
}
NTSTATUS NTAPI LdrLoadDllMemoryExW(
_Out_ HMEMORYMODULE* BaseAddress,
_Out_opt_ PVOID* LdrEntry,
_In_ DWORD dwFlags,
_In_ LPVOID BufferAddress,
_In_ size_t BufferSize,
_In_opt_ LPCWSTR DllName,
_In_opt_ LPCWSTR DllFullName) {
PMEMORYMODULE module = nullptr;
NTSTATUS status = STATUS_SUCCESS;
PLDR_DATA_TABLE_ENTRY ModuleEntry = nullptr;
PIMAGE_NT_HEADERS headers = nullptr;
if (BufferSize)return STATUS_INVALID_PARAMETER_5;
__try {
*BaseAddress = nullptr;
if (LdrEntry)*LdrEntry = nullptr;
if (!RtlIsValidImageBuffer(BufferAddress, &BufferSize) && !(dwFlags & LOAD_FLAGS_PASS_IMAGE_CHECK)) {
status = STATUS_INVALID_IMAGE_FORMAT;
}
if (MmpGlobalDataPtr == nullptr) {
status = STATUS_INVALID_PARAMETER;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {
status = GetExceptionCode();
}
if (!NT_SUCCESS(status))return status;
if (dwFlags & LOAD_FLAGS_NOT_MAP_DLL) {
dwFlags &= LOAD_FLAGS_NOT_MAP_DLL;
DllName = DllFullName = nullptr;
}
if (dwFlags & LOAD_FLAGS_USE_DLL_NAME && (!DllName || !DllFullName))return STATUS_INVALID_PARAMETER_3;
if (DllName) {
int length = (int)wcslen(DllName);
PLIST_ENTRY ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList, ListEntry = ListHead->Flink;
PIMAGE_NT_HEADERS h1 = RtlImageNtHeader(BufferAddress), h2 = nullptr;
if (!h1)return STATUS_INVALID_IMAGE_FORMAT;
while (ListEntry != ListHead) {
PLDR_DATA_TABLE_ENTRY CurEntry = CONTAINING_RECORD(ListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
ListEntry = ListEntry->Flink;
/* Check if it's being unloaded */
if (!CurEntry->InMemoryOrderLinks.Flink) continue;
auto dist = (CurEntry->BaseDllName.Length / sizeof(wchar_t)) - length;
bool equal = false;
if (dist == 0 || dist == 4) {
equal = !_wcsnicmp(DllName, CurEntry->BaseDllName.Buffer, length);
}
else {
continue;
}
/* Check if name matches */
if (equal) {
/* Let's compare their headers */
if (!(h2 = RtlImageNtHeader(CurEntry->DllBase)))continue;
if (!(module = MapMemoryModuleHandle((HMEMORYMODULE)CurEntry->DllBase)))continue;
if ((h1->OptionalHeader.SizeOfCode == h2->OptionalHeader.SizeOfCode) &&
(h1->OptionalHeader.SizeOfHeaders == h2->OptionalHeader.SizeOfHeaders)) {
/* This is our entry!, update load count and return success */
if (!module->UseReferenceCount || dwFlags & LOAD_FLAGS_NOT_USE_REFERENCE_COUNT)return STATUS_INVALID_PARAMETER_3;
RtlUpdateReferenceCount(module, FLAG_REFERENCE);
*BaseAddress = (HMEMORYMODULE)CurEntry->DllBase;
if (LdrEntry)*LdrEntry = CurEntry;
return STATUS_SUCCESS;
}
}
}
}
status = MemoryLoadLibrary(BaseAddress, BufferAddress, (DWORD)BufferSize);
if (!NT_SUCCESS(status) || status == STATUS_IMAGE_MACHINE_TYPE_MISMATCH)return status;
if (!(module = MapMemoryModuleHandle(*BaseAddress))) {
__fastfail(FAST_FAIL_FATAL_APP_EXIT);
DebugBreak();
ExitProcess(STATUS_INVALID_ADDRESS);
TerminateProcess(NtCurrentProcess(), STATUS_INVALID_ADDRESS);
}
module->loadFromLdrLoadDllMemory = true;
headers = RtlImageNtHeader(*BaseAddress);
if (headers->OptionalHeader.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_NO_SEH)dwFlags |= LOAD_FLAGS_NOT_ADD_INVERTED_FUNCTION;
if (dwFlags & LOAD_FLAGS_NOT_MAP_DLL) {
do {
status = MemoryResolveImportTable(LPBYTE(*BaseAddress), headers, module);
if (!NT_SUCCESS(status))break;
status = MemorySetSectionProtection(LPBYTE(*BaseAddress), headers);
if (!NT_SUCCESS(status))break;
if (!LdrpExecuteTLS(module) || !LdrpCallInitializers(module, DLL_PROCESS_ATTACH)) {
status = STATUS_DLL_INIT_FAILED;
break;
}
} while (false);
if (!NT_SUCCESS(status)) {
MemoryFreeLibrary(*BaseAddress);
}
return status;
}
do {
status = LdrMapDllMemory(*BaseAddress, dwFlags, DllName, DllFullName, &ModuleEntry);
if (!NT_SUCCESS(status))break;
module->MappedDll = true;
module->LdrEntry = ModuleEntry;
status = MemoryResolveImportTable(LPBYTE(*BaseAddress), headers, module);
if (!NT_SUCCESS(status))break;
status = MemorySetSectionProtection(LPBYTE(*BaseAddress), headers);
if (!NT_SUCCESS(status))break;
if (!(dwFlags & LOAD_FLAGS_NOT_USE_REFERENCE_COUNT))module->UseReferenceCount = true;
if (!(dwFlags & LOAD_FLAGS_NOT_ADD_INVERTED_FUNCTION)) {
status = RtlInsertInvertedFunctionTable((PVOID)module->codeBase, headers->OptionalHeader.SizeOfImage);
if (!NT_SUCCESS(status)) break;
module->InsertInvertedFunctionTableEntry = true;
}
if (!(dwFlags & LOAD_FLAGS_NOT_HANDLE_TLS)) {
status = MmpGlobalDataPtr->MmpFunctions->_MmpHandleTlsData(ModuleEntry);
if (!NT_SUCCESS(status)) {
if (dwFlags & LOAD_FLAGS_NOT_FAIL_IF_HANDLE_TLS) status = 0x7fffffff;
if (!NT_SUCCESS(status))break;
}
else {
module->TlsHandled = true;
}
}
if (dwFlags & LOAD_FLAGS_HOOK_DOT_NET) {
MmpPreInitializeHooksForDotNet();
}
if (!LdrpExecuteTLS(module) || !LdrpCallInitializers(module, DLL_PROCESS_ATTACH)) {
status = STATUS_DLL_INIT_FAILED;
break;
}
if (dwFlags & LOAD_FLAGS_HOOK_DOT_NET) {
MmpInitializeHooksForDotNet();
}
} while (false);
if (NT_SUCCESS(status)) {
if (LdrEntry)*LdrEntry = ModuleEntry;
}
else {
LdrUnloadDllMemory(*BaseAddress);
*BaseAddress = nullptr;
}
return status;
}
NTSTATUS NTAPI LdrUnloadDllMemory(_In_ HMEMORYMODULE BaseAddress) {
PLDR_DATA_TABLE_ENTRY CurEntry;
ULONG count = 0;
NTSTATUS status = STATUS_SUCCESS;
PMEMORYMODULE module = MapMemoryModuleHandle(BaseAddress);
PIMAGE_NT_HEADERS headers = RtlImageNtHeader(BaseAddress);
do {
//Not a memory module loaded via LdrLoadDllMemory
if (!module || !module->loadFromLdrLoadDllMemory) {
status = STATUS_INVALID_HANDLE;
break;
}
if (MmpGlobalDataPtr == nullptr) {
status = STATUS_INVALID_PARAMETER;
break;
}
//Mapping dll failed
if (!module->MappedDll) {
module->underUnload = true;
status = (MemoryFreeLibrary(BaseAddress) ? STATUS_SUCCESS : STATUS_UNSUCCESSFUL);
break;
}
CurEntry = (PLDR_DATA_TABLE_ENTRY)module->LdrEntry;
if (headers->OptionalHeader.SizeOfImage != CurEntry->SizeOfImage) __fastfail(FAST_FAIL_FATAL_APP_EXIT);
if (module->UseReferenceCount) {
status = RtlGetReferenceCount(module, &count);
if (!NT_SUCCESS(status)) break;
}
if (count & ~1) {
status = RtlUpdateReferenceCount(module, FLAG_DEREFERENCE);
break;
}
module->underUnload = true;
if (module->initialized) {
PLDR_INIT_ROUTINE((LPVOID)(module->codeBase + headers->OptionalHeader.AddressOfEntryPoint))(
(HINSTANCE)module->codeBase,
DLL_PROCESS_DETACH,
0
);
}
if (module->MappedDll) {
if (module->InsertInvertedFunctionTableEntry) {
status = RtlRemoveInvertedFunctionTable(BaseAddress);
if (!NT_SUCCESS(status)) __fastfail(FAST_FAIL_CORRUPT_LIST_ENTRY);
}
if (module->TlsHandled) {
status = MmpGlobalDataPtr->MmpFunctions->_MmpReleaseTlsEntry(CurEntry);
if (!NT_SUCCESS(status)) __fastfail(FAST_FAIL_FATAL_APP_EXIT);
}
if (!RtlFreeLdrDataTableEntry(CurEntry)) __fastfail(FAST_FAIL_FATAL_APP_EXIT);
}
if (!MemoryFreeLibrary(BaseAddress)) __fastfail(FAST_FAIL_FATAL_APP_EXIT);
} while (false);
return status;
}
DECLSPEC_NORETURN
VOID NTAPI LdrUnloadDllMemoryAndExitThread(_In_ HMEMORYMODULE BaseAddress, _In_ DWORD dwExitCode) {
LdrUnloadDllMemory(BaseAddress);
RtlExitUserThread(dwExitCode);
}
NTSTATUS NTAPI LdrQuerySystemMemoryModuleFeatures(_Out_ PDWORD pFeatures) {
NTSTATUS status = STATUS_SUCCESS;
__try {
*pFeatures = MmpGlobalDataPtr->MmpFeatures;
}
__except (EXCEPTION_EXECUTE_HANDLER) {
status = GetExceptionCode();
}
return status;
}