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LdrEntry.cpp
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341 lines (300 loc) · 12.2 KB
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#include "stdafx.h"
#include <cstddef>
static NTSTATUS RtlFreeDependencies(_In_ PLDR_DATA_TABLE_ENTRY_WIN10 LdrEntry) {
_LDR_DDAG_NODE* DependentDdgeNode = nullptr;
PLDR_DATA_TABLE_ENTRY_WIN10 ModuleEntry = nullptr;
_LDRP_CSLIST* head = (decltype(head))LdrEntry->DdagNode->Dependencies, * entry = head;
HANDLE heap = NtCurrentPeb()->ProcessHeap;
BOOL IsWin8 = RtlIsWindowsVersionInScope(6, 2, 0, 6, 3, -1);
if (!LdrEntry->DdagNode->Dependencies)return STATUS_SUCCESS;
//find all dependencies and free
do {
DependentDdgeNode = entry->Dependent.DependentDdagNode;
if (DependentDdgeNode->Modules.Flink->Flink != &DependentDdgeNode->Modules) __fastfail(FAST_FAIL_CORRUPT_LIST_ENTRY);
ModuleEntry = decltype(ModuleEntry)((size_t)DependentDdgeNode->Modules.Flink - offsetof(_LDR_DATA_TABLE_ENTRY_WIN8, NodeModuleLink));
if (ModuleEntry->DdagNode != DependentDdgeNode) __fastfail(FAST_FAIL_CORRUPT_LIST_ENTRY);
if (!DependentDdgeNode->IncomingDependencies) __fastfail(FAST_FAIL_CORRUPT_LIST_ENTRY);
_LDRP_CSLIST::_LDRP_CSLIST_INCOMMING* _last = DependentDdgeNode->IncomingDependencies, * _entry = _last;
_LDR_DDAG_NODE* CurrentDdagNode;
ULONG State = 0;
PVOID Cookies;
//Acquire LoaderLock
do {
if (!NT_SUCCESS(LdrLockLoaderLock(LDR_LOCK_LOADER_LOCK_FLAG_TRY_ONLY, &State, &Cookies))) __fastfail(FAST_FAIL_FATAL_APP_EXIT);
} while (State != LDR_LOCK_LOADER_LOCK_DISPOSITION_LOCK_ACQUIRED);
do {
CurrentDdagNode = (decltype(CurrentDdagNode))((size_t)_entry->IncommingDdagNode & ~1);
if (CurrentDdagNode == LdrEntry->DdagNode) {
//node is head
if (_entry == DependentDdgeNode->IncomingDependencies) {
//only one node in list
if (_entry->NextIncommingEntry == (PSINGLE_LIST_ENTRY)DependentDdgeNode->IncomingDependencies) {
DependentDdgeNode->IncomingDependencies = nullptr;
}
else {
//find the last node in the list
PSINGLE_LIST_ENTRY i = _entry->NextIncommingEntry;
while (i->Next != (PSINGLE_LIST_ENTRY)_entry)i = i->Next;
i->Next = _entry->NextIncommingEntry;
DependentDdgeNode->IncomingDependencies = (_LDRP_CSLIST::_LDRP_CSLIST_INCOMMING*)_entry->NextIncommingEntry;
}
}
//node is not head
else {
_last->NextIncommingEntry = _entry->NextIncommingEntry;
}
break;
}
//save the last entry
if (_last != _entry)_last = (decltype(_last))_last->NextIncommingEntry;
_entry = (decltype(_entry))_entry->NextIncommingEntry;
} while (_entry != _last);
//free LoaderLock
LdrUnlockLoaderLock(0, Cookies);
entry = (decltype(entry))entry->Dependent.NextDependentEntry;
//free it
if (IsWin8) {
//Update win8 dep count
_LDR_DDAG_NODE_WIN8* win8_node = (decltype(win8_node))ModuleEntry->DdagNode;
if (!win8_node->DependencyCount)__fastfail(FAST_FAIL_CORRUPT_LIST_ENTRY);
--win8_node->DependencyCount;
if (!ModuleEntry->DdagNode->LoadCount && win8_node->ReferenceCount == 1 && !win8_node->DependencyCount) {
win8_node->LoadCount = 1;
LdrUnloadDll(ModuleEntry->DllBase);
}
}
else {
LdrUnloadDll(ModuleEntry->DllBase);
}
RtlFreeHeap(heap, 0, LdrEntry->DdagNode->Dependencies);
//lookup next dependent.
LdrEntry->DdagNode->Dependencies = (_LDRP_CSLIST::_LDRP_CSLIST_DEPENDENT*)(entry == head ? nullptr : entry);
} while (entry != head);
return STATUS_SUCCESS;
}
PLDR_DATA_TABLE_ENTRY NTAPI RtlAllocateDataTableEntry(_In_ PVOID BaseAddress) {
PLDR_DATA_TABLE_ENTRY LdrEntry = nullptr;
PIMAGE_NT_HEADERS NtHeader;
HANDLE heap = NtCurrentPeb()->ProcessHeap;
/* Make sure the header is valid */
if (NtHeader = RtlImageNtHeader(BaseAddress)) {
/* Allocate an entry */
LdrEntry = (PLDR_DATA_TABLE_ENTRY)RtlAllocateHeap(heap, HEAP_ZERO_MEMORY, MmpGlobalDataPtr->LdrDataTableEntrySize);
}
/* Return the entry */
return LdrEntry;
}
BOOL NTAPI RtlInitializeLdrDataTableEntry(
_Out_ PLDR_DATA_TABLE_ENTRY LdrEntry,
_In_ DWORD dwFlags,
_In_ PVOID BaseAddress,
_In_ UNICODE_STRING& DllBaseName,
_In_ UNICODE_STRING& DllFullName) {
RtlZeroMemory(LdrEntry, MmpGlobalDataPtr->LdrDataTableEntrySize);
PIMAGE_NT_HEADERS headers = RtlImageNtHeader(BaseAddress);
if (!headers)return FALSE;
HANDLE heap = NtCurrentPeb()->ProcessHeap;
bool FlagsProcessed = false;
bool CorImage = false, CorIL = false;
auto& com = headers->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR];
if (com.Size && com.VirtualAddress) {
CorImage = true;
auto cor = PIMAGE_COR20_HEADER(LPBYTE(BaseAddress) + com.VirtualAddress);
if (cor->Flags & ReplacesCorHdrNumericDefines::COMIMAGE_FLAGS_ILONLY) {
CorIL = true;
}
}
switch (MmpGlobalDataPtr->WindowsVersion) {
case WINDOWS_VERSION::win11: {
auto entry = (PLDR_DATA_TABLE_ENTRY_WIN11)LdrEntry;
entry->CheckSum = headers->OptionalHeader.CheckSum;
}
case WINDOWS_VERSION::win10:
case WINDOWS_VERSION::win10_1:
case WINDOWS_VERSION::win10_2: {
auto entry = (PLDR_DATA_TABLE_ENTRY_WIN10)LdrEntry;
entry->ReferenceCount = 1;
}
case WINDOWS_VERSION::win8:
case WINDOWS_VERSION::winBlue: {
auto entry = (PLDR_DATA_TABLE_ENTRY_WIN8)LdrEntry;
BOOL IsWin8 = RtlIsWindowsVersionInScope(6, 2, 0, 6, 3, -1);
NtQuerySystemTime(&entry->LoadTime);
entry->OriginalBase = headers->OptionalHeader.ImageBase;
entry->BaseNameHashValue = LdrHashEntry(DllBaseName, false);
entry->LoadReason = LoadReasonDynamicLoad;
if (!NT_SUCCESS(RtlInsertModuleBaseAddressIndexNode(LdrEntry, BaseAddress)))return FALSE;
if (!(entry->DdagNode = (decltype(entry->DdagNode))
RtlAllocateHeap(heap, HEAP_ZERO_MEMORY, IsWin8 ? sizeof(_LDR_DDAG_NODE_WIN8) : sizeof(_LDR_DDAG_NODE))))return FALSE;
entry->NodeModuleLink.Flink = &entry->DdagNode->Modules;
entry->NodeModuleLink.Blink = &entry->DdagNode->Modules;
entry->DdagNode->Modules.Flink = &entry->NodeModuleLink;
entry->DdagNode->Modules.Blink = &entry->NodeModuleLink;
entry->DdagNode->State = LdrModulesReadyToRun;
entry->DdagNode->LoadCount = 1;
if (IsWin8) ((_LDR_DDAG_NODE_WIN8*)(entry->DdagNode))->ReferenceCount = 1;
entry->ImageDll = entry->LoadNotificationsSent = entry->EntryProcessed =
entry->InLegacyLists = entry->InIndexes = true;
entry->ProcessAttachCalled = false;
entry->InExceptionTable = !(dwFlags & LOAD_FLAGS_NOT_ADD_INVERTED_FUNCTION);
entry->CorImage = CorImage;
entry->CorILOnly = CorIL;
FlagsProcessed = true;
}
case WINDOWS_VERSION::win7: {
if (MmpGlobalDataPtr->LdrDataTableEntrySize == sizeof(LDR_DATA_TABLE_ENTRY_WIN7)) {
auto entry = (PLDR_DATA_TABLE_ENTRY_WIN7)LdrEntry;
entry->OriginalBase = headers->OptionalHeader.ImageBase;
NtQuerySystemTime(&entry->LoadTime);
}
}
case WINDOWS_VERSION::vista: {
if (MmpGlobalDataPtr->LdrDataTableEntrySize == sizeof(LDR_DATA_TABLE_ENTRY_VISTA) ||
MmpGlobalDataPtr->LdrDataTableEntrySize == sizeof(LDR_DATA_TABLE_ENTRY_WIN7)) {
auto entry = (PLDR_DATA_TABLE_ENTRY_VISTA)LdrEntry;
InitializeListHead(&entry->ForwarderLinks);
InitializeListHead(&entry->StaticLinks);
InitializeListHead(&entry->ServiceTagLinks);
}
}
case WINDOWS_VERSION::xp: {
LdrEntry->DllBase = BaseAddress;
LdrEntry->SizeOfImage = headers->OptionalHeader.SizeOfImage;
LdrEntry->TimeDateStamp = headers->FileHeader.TimeDateStamp;
LdrEntry->BaseDllName = DllBaseName;
LdrEntry->FullDllName = DllFullName;
LdrEntry->EntryPoint = (PLDR_INIT_ROUTINE)((size_t)BaseAddress + headers->OptionalHeader.AddressOfEntryPoint);
LdrEntry->ObsoleteLoadCount = 1;
if (!FlagsProcessed) {
LdrEntry->Flags = LDRP_IMAGE_DLL | LDRP_ENTRY_INSERTED | LDRP_ENTRY_PROCESSED;
if (CorImage)LdrEntry->Flags |= LDRP_COR_IMAGE;
}
InitializeListHead(&LdrEntry->HashLinks);
return TRUE;
}
default:return FALSE;
}
}
BOOL NTAPI RtlFreeLdrDataTableEntry(_In_ PLDR_DATA_TABLE_ENTRY LdrEntry) {
HANDLE heap = NtCurrentPeb()->ProcessHeap;
switch (MmpGlobalDataPtr->WindowsVersion) {
case WINDOWS_VERSION::win11:
case WINDOWS_VERSION::win10:
case WINDOWS_VERSION::win10_1:
case WINDOWS_VERSION::win10_2:
case WINDOWS_VERSION::win8:
case WINDOWS_VERSION::winBlue: {
auto entry = (PLDR_DATA_TABLE_ENTRY_WIN10)LdrEntry;
RtlFreeDependencies(entry);
RtlFreeHeap(heap, 0, entry->DdagNode);
RtlRemoveModuleBaseAddressIndexNode(LdrEntry);
}
case WINDOWS_VERSION::win7:
case WINDOWS_VERSION::vista: {
if (MmpGlobalDataPtr->LdrDataTableEntrySize == sizeof(LDR_DATA_TABLE_ENTRY_VISTA) ||
MmpGlobalDataPtr->LdrDataTableEntrySize == sizeof(LDR_DATA_TABLE_ENTRY_WIN7)) {
PLDR_DATA_TABLE_ENTRY_VISTA entry = (decltype(entry))LdrEntry;
PLIST_ENTRY head = &entry->ForwarderLinks, next = head->Flink;
while (head != next) {
PLDR_DATA_TABLE_ENTRY dep = *(decltype(&dep))((size_t*)next + 2);
LdrUnloadDll(dep->DllBase);
next = next->Flink;
RtlFreeHeap(heap, 0, next->Blink);
}
}
}
case WINDOWS_VERSION::xp: {
RtlFreeHeap(heap, 0, LdrEntry->BaseDllName.Buffer);
RtlFreeHeap(heap, 0, LdrEntry->FullDllName.Buffer);
RemoveEntryList(&LdrEntry->InLoadOrderLinks);
RemoveEntryList(&LdrEntry->InMemoryOrderLinks);
RemoveEntryList(&LdrEntry->InInitializationOrderLinks);
RemoveEntryList(&LdrEntry->HashLinks);
RtlFreeHeap(heap, 0, LdrEntry);
return TRUE;
}
default:return FALSE;
}
}
NTSTATUS NTAPI RtlUpdateReferenceCount(
_Inout_ PMEMORYMODULE pModule,
_In_ DWORD Flags) {
if (Flags != FLAG_REFERENCE && Flags != FLAG_DEREFERENCE)return STATUS_INVALID_PARAMETER_2;
if (pModule->dwReferenceCount == 0xffffffff)return STATUS_SUCCESS;
if (PLDR_DATA_TABLE_ENTRY(pModule->LdrEntry)->ObsoleteLoadCount == 0xffff) {
pModule->dwReferenceCount = 0xffffffff;
return STATUS_SUCCESS;
}
if (Flags == FLAG_REFERENCE) {
++pModule->dwReferenceCount;
}
else {
if (pModule->dwReferenceCount)--pModule->dwReferenceCount;
}
return STATUS_SUCCESS;
}
NTSTATUS NTAPI RtlGetReferenceCount(
_In_ PMEMORYMODULE pModule,
_Out_ PULONG Count) {
*Count = pModule->dwReferenceCount;
return STATUS_SUCCESS;
}
VOID NTAPI RtlInsertMemoryTableEntry(_In_ PLDR_DATA_TABLE_ENTRY LdrEntry) {
PPEB_LDR_DATA PebData = NtCurrentPeb()->Ldr;
PLIST_ENTRY LdrpHashTable = MmpGlobalDataPtr->MmpLdrEntry->LdrpHashTable;
/* Validate hash table */
if (!MmpGlobalDataPtr->MmpLdrEntry->LdrpHashTable) return;
/* Insert into hash table */
ULONG i;
i = LdrHashEntry(LdrEntry->BaseDllName);
InsertTailList(&LdrpHashTable[i], &LdrEntry->HashLinks);
/* Insert into other lists */
InsertTailList(&PebData->InLoadOrderModuleList, &LdrEntry->InLoadOrderLinks);
InsertTailList(&PebData->InMemoryOrderModuleList, &LdrEntry->InMemoryOrderLinks);
InsertTailList(&PebData->InInitializationOrderModuleList, &LdrEntry->InInitializationOrderLinks);
}
PLDR_DATA_TABLE_ENTRY NTAPI RtlFindLdrTableEntryByHandle(_In_ PVOID BaseAddress) {
PLIST_ENTRY ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList, ListEntry = ListHead->Flink;
PLDR_DATA_TABLE_ENTRY CurEntry;
while (ListEntry != ListHead) {
CurEntry = CONTAINING_RECORD(ListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
ListEntry = ListEntry->Flink;
if (CurEntry->DllBase == BaseAddress) {
return CurEntry;
}
}
return nullptr;
}
PLDR_DATA_TABLE_ENTRY NTAPI RtlFindLdrTableEntryByBaseName(_In_z_ PCWSTR BaseName) {
PLIST_ENTRY ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList, ListEntry = ListHead->Flink;
PLDR_DATA_TABLE_ENTRY CurEntry;
while (ListEntry != ListHead) {
CurEntry = CONTAINING_RECORD(ListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
ListEntry = ListEntry->Flink;
if (!_wcsnicmp(BaseName, CurEntry->BaseDllName.Buffer, (CurEntry->BaseDllName.Length / sizeof(wchar_t)) - 4) ||
!_wcsnicmp(BaseName, CurEntry->BaseDllName.Buffer, CurEntry->BaseDllName.Length / sizeof(wchar_t))) {
return CurEntry;
}
}
return nullptr;
}
ULONG NTAPI LdrHashEntry(_In_ UNICODE_STRING& DllBaseName, _In_ BOOL ToIndex) {
ULONG result = 0;
switch (MmpGlobalDataPtr->WindowsVersion) {
case WINDOWS_VERSION::xp:
result = RtlUpcaseUnicodeChar(DllBaseName.Buffer[0]) - 'A';
break;
case WINDOWS_VERSION::vista:
result = RtlUpcaseUnicodeChar(DllBaseName.Buffer[0]) - 1;
break;
case WINDOWS_VERSION::win7:
for (USHORT i = 0; i < (DllBaseName.Length / sizeof(wchar_t)); ++i)
result += 0x1003F * RtlUpcaseUnicodeChar(DllBaseName.Buffer[i]);
break;
default:
RtlHashUnicodeString(&DllBaseName, TRUE, HASH_STRING_ALGORITHM_DEFAULT, &result);
break;
}
if (ToIndex)result &= (LDR_HASH_TABLE_ENTRIES - 1);
return result;
}