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202 lines (181 loc) · 6.87 KB
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#include "stdafx.h"
static VOID RtlpInsertInvertedFunctionTable(
_In_ PRTL_INVERTED_FUNCTION_TABLE InvertedTable,
_In_ PVOID ImageBase,
_In_ ULONG SizeOfImage) {
#ifdef _WIN64
ULONG CurrentSize;
PIMAGE_RUNTIME_FUNCTION_ENTRY FunctionTable;
ULONG Index;
ULONG SizeOfTable = 0;
bool IsWin8OrGreater = RtlIsWindowsVersionOrGreater(6, 2, 0);
Index = (ULONG)IsWin8OrGreater;
CurrentSize = InvertedTable->Count;
if (CurrentSize != InvertedTable->MaxCount) {
if (CurrentSize != 0) {
while (Index < CurrentSize) {
if (ImageBase < InvertedTable->Entries[Index].ImageBase)break;
++Index;
}
if (Index != CurrentSize) {
RtlMoveMemory(&InvertedTable->Entries[Index + 1],
&InvertedTable->Entries[Index],
(CurrentSize - Index) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
}
}
FunctionTable = (decltype(FunctionTable))RtlImageDirectoryEntryToData(ImageBase, TRUE, IMAGE_DIRECTORY_ENTRY_EXCEPTION, &SizeOfTable);
InvertedTable->Entries[Index].ExceptionDirectory = FunctionTable;
InvertedTable->Entries[Index].ImageBase = ImageBase;
InvertedTable->Entries[Index].ImageSize = SizeOfImage;
InvertedTable->Entries[Index].ExceptionDirectorySize = SizeOfTable;
InvertedTable->Count++;
}
else {
IsWin8OrGreater ? (InvertedTable->Overflow = TRUE) : (InvertedTable->Epoch = TRUE);
}
#else
DWORD ptr, count;
bool IsWin8OrGreater = RtlIsWindowsVersionOrGreater(6, 2, 0);
ULONG Index = IsWin8OrGreater ? 1 : 0;
if (InvertedTable->Count == InvertedTable->MaxCount) {
if (IsWin8OrGreater)InvertedTable->NextEntrySEHandlerTableEncoded = TRUE;
else InvertedTable->Overflow = TRUE;
return;
}
while (Index < InvertedTable->Count) {
if (ImageBase < (IsWin8OrGreater ?
((PRTL_INVERTED_FUNCTION_TABLE_ENTRY_64)&InvertedTable->Entries[Index])->ImageBase :
InvertedTable->Entries[Index].ImageBase))
break;
Index++;
}
if (Index != InvertedTable->Count) {
if (IsWin8OrGreater) {
RtlMoveMemory(&InvertedTable->Entries[Index + 1], &InvertedTable->Entries[Index],
(InvertedTable->Count - Index) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
}
else {
RtlMoveMemory(&InvertedTable->Entries[Index].NextEntrySEHandlerTableEncoded,
Index ? &InvertedTable->Entries[Index - 1].NextEntrySEHandlerTableEncoded : (PVOID)&InvertedTable->NextEntrySEHandlerTableEncoded,
(InvertedTable->Count - Index) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
}
}
RtlCaptureImageExceptionValues(ImageBase, &ptr, &count);
if (IsWin8OrGreater) {
//memory layout is same as x64
PRTL_INVERTED_FUNCTION_TABLE_ENTRY_64 entry = (decltype(entry))&InvertedTable->Entries[Index];
entry->ExceptionDirectory = (PIMAGE_RUNTIME_FUNCTION_ENTRY)RtlEncodeSystemPointer((PVOID)ptr);
entry->ExceptionDirectorySize = count;
entry->ImageBase = ImageBase;
entry->ImageSize = SizeOfImage;
}
else {
if (Index) InvertedTable->Entries[Index - 1].NextEntrySEHandlerTableEncoded = RtlEncodeSystemPointer((PVOID)ptr);
else InvertedTable->NextEntrySEHandlerTableEncoded = (DWORD)RtlEncodeSystemPointer((PVOID)ptr);
InvertedTable->Entries[Index].ImageBase = ImageBase;
InvertedTable->Entries[Index].ImageSize = SizeOfImage;
InvertedTable->Entries[Index].SEHandlerCount = count;
}
++InvertedTable->Count;
#endif
return;
}
static VOID RtlpRemoveInvertedFunctionTable(
_In_ PRTL_INVERTED_FUNCTION_TABLE InvertedTable,
_In_ PVOID ImageBase) {
ULONG CurrentSize;
ULONG Index;
//bool need = RtlIsWindowsVersionOrGreater(6, 2, 0);
bool IsWin8OrGreater = RtlIsWindowsVersionOrGreater(6, 2, 0);
CurrentSize = InvertedTable->Count;
for (Index = 0; Index < CurrentSize; Index += 1) {
if (ImageBase == (IsWin8OrGreater ?
((PRTL_INVERTED_FUNCTION_TABLE_ENTRY_64)&InvertedTable->Entries[Index])->ImageBase :
InvertedTable->Entries[Index].ImageBase))
break;
}
if (Index != CurrentSize) {
//if (need)_InterlockedIncrement(&InvertedTable->Epoch);
if (CurrentSize != 1) {
#ifdef _WIN64
RtlMoveMemory(&InvertedTable->Entries[Index],
&InvertedTable->Entries[Index + 1],
(CurrentSize - Index - 1) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
#else
if (IsWin8OrGreater) {
RtlMoveMemory(&InvertedTable->Entries[Index], &InvertedTable->Entries[Index + 1],
(CurrentSize - Index) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
}
else {
RtlMoveMemory(
Index ? &InvertedTable->Entries[Index - 1].NextEntrySEHandlerTableEncoded : (PVOID)&InvertedTable->NextEntrySEHandlerTableEncoded,
&InvertedTable->Entries[Index].NextEntrySEHandlerTableEncoded,
(CurrentSize - Index) * sizeof(RTL_INVERTED_FUNCTION_TABLE_ENTRY));
}
#endif
}
InvertedTable->Count--;
//if (need)_InterlockedIncrement(&InvertedTable->Epoch);
}
if (InvertedTable->Count != InvertedTable->MaxCount) {
if (IsWin8OrGreater) {
PRTL_INVERTED_FUNCTION_TABLE_64(InvertedTable)->Overflow = FALSE;
}
else {
PRTL_INVERTED_FUNCTION_TABLE_WIN7_32(InvertedTable)->Overflow = FALSE;
}
}
return;
}
static NTSTATUS RtlProtectMrdata(_In_ ULONG Protect) {
static PVOID MrdataBase = nullptr;
static SIZE_T size = 0;
NTSTATUS status;
PVOID tmp;
SIZE_T tmp_len;
ULONG old;
if (!MrdataBase) {
MEMORY_BASIC_INFORMATION mbi{};
status = NtQueryVirtualMemory(GetCurrentProcess(), MmpGlobalDataPtr->MmpInvertedFunctionTable->LdrpInvertedFunctionTable, MemoryBasicInformation, &mbi, sizeof(mbi), nullptr);
if (!NT_SUCCESS(status))return status;
MrdataBase = mbi.BaseAddress;
size = mbi.RegionSize;
}
tmp = MrdataBase;
tmp_len = size;
return NtProtectVirtualMemory(GetCurrentProcess(), &tmp, &tmp_len, Protect, &old);
}
NTSTATUS NTAPI RtlInsertInvertedFunctionTable(
_In_ PVOID BaseAddress,
_In_ ULONG ImageSize) {
auto table = PRTL_INVERTED_FUNCTION_TABLE(MmpGlobalDataPtr->MmpInvertedFunctionTable->LdrpInvertedFunctionTable);
if (!table)return STATUS_NOT_SUPPORTED;
bool need_virtual_protect = RtlIsWindowsVersionOrGreater(6, 3, 0);
NTSTATUS status;
if (need_virtual_protect) {
status = RtlProtectMrdata(PAGE_READWRITE);
if (!NT_SUCCESS(status))return status;
}
RtlpInsertInvertedFunctionTable(table, BaseAddress, ImageSize);
if (need_virtual_protect) {
status = RtlProtectMrdata(PAGE_READONLY);
if (!NT_SUCCESS(status))return status;
}
return (RtlIsWindowsVersionOrGreater(6, 2, 0) ? PRTL_INVERTED_FUNCTION_TABLE_64(table)->Overflow : PRTL_INVERTED_FUNCTION_TABLE_WIN7_32(table)->Overflow) ?
STATUS_NO_MEMORY : STATUS_SUCCESS;
}
NTSTATUS NTAPI RtlRemoveInvertedFunctionTable(_In_ PVOID ImageBase) {
auto table = PRTL_INVERTED_FUNCTION_TABLE(MmpGlobalDataPtr->MmpInvertedFunctionTable->LdrpInvertedFunctionTable);
bool need_virtual_protect = RtlIsWindowsVersionOrGreater(6, 3, 0);
NTSTATUS status;
if (need_virtual_protect) {
status = RtlProtectMrdata(PAGE_READWRITE);
if (!NT_SUCCESS(status))return status;
}
RtlpRemoveInvertedFunctionTable(table, ImageBase);
if (need_virtual_protect) {
status = RtlProtectMrdata(PAGE_READONLY);
if (!NT_SUCCESS(status))return status;
}
return STATUS_SUCCESS;
}