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GuardAMD64.c
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GuardAMD64.c
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/*
*
* Copyright (c) 2015-2018 by blindtiger ( [email protected] )
*
* 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 Initial Developer of the Original e is blindtiger.
*
*/
#include <OsDefs.h>
#include "Ctx.h"
#include "Except.h"
#include "Guard.h"
#include "Jump.h"
#include "Lock.h"
#include "Reload.h"
#include "Scan.h"
#include "Stack.h"
#include "Testis.h"
#define __ROL64(x, n) (((x) << ((n % 64))) | ((x) >> (64 - (n % 64))))
#define __ROR64(x, n) (((x) >> ((n % 64))) | ((x) << (64 - (n % 64))))
#define PG_KEY_INTERVAL 0x100
#define PG_FIELD_OFFSET 0x100
#define PG_FIELD_ROL_BITS 11
#define PG_MAX_FOUND 10
static PEX_SPIN_LOCK LargePoolTableLock;
static PPOOL_BIG_PAGES PoolBigPageTable;
static SIZE_T PoolBigPageTableSize;
static BOOLEAN PgIsBtcEncode;
static ULONG PgEntryRvaOffset;
static ULONG PgAppendSectionSize;
static PVOID PgAppendSection;
static ULONG PgNtSectionSize;
// context field may be 0
static ULONG64 PgContextField[4];
static WORK_QUEUE_ITEM PgClearWorkerItem;
PVOID NtosExpWorkerContext;
static ULONG_PTR PteBase;
static ULONG_PTR PdeBase;
POOL_TYPE
(NTAPI * NtosMmDeterminePoolType)(
__in PVOID VirtualAddress
);
VOID
(NTAPI * NtosKiStartSystemThread)(
VOID
);
VOID
(NTAPI * NtosPspSystemThreadStartup)(
__in PKSTART_ROUTINE StartRoutine,
__in PVOID StartContext
);
VOID
(NTAPI * NtosExpWorkerThread)(
__in PVOID StartContext
);
PMMPTE
(NTAPI * NtosMiGetPteAddress)(
__in PVOID VirtualAddress
);
PMMPTE
(NTAPI * NtosMiGetPdeAddress)(
__in PVOID VirtualAddress
);
ULONG64
NTAPI
_btc64(
__in ULONG64 a,
__in ULONG64 b
);
PVOID
NTAPI
_PgEncodeClear(
__in PVOID Reserved,
__in PVOID PgContext
);
VOID
NTAPI
_RevertWorkerThreadToSelf(
VOID
);
PMMPTE
NTAPI
GetPteAddress(
__in PVOID VirtualAddress
)
{
PMMPTE PointerPte = NULL;
if (0 != PteBase) {
PointerPte = (PMMPTE)
((((ULONG_PTR)VirtualAddress & VIRTUAL_ADDRESS_MASK) >> PTI_SHIFT) << PTE_SHIFT);
PointerPte = (PMMPTE)(PteBase + (ULONG_PTR)PointerPte);
}
return PointerPte;
}
PVOID
NTAPI
GetVirtualAddressMappedByPte(
__in PMMPTE Pte
)
{
PVOID VirtualAddress = NULL;
LONG_PTR Index = 0;
Index = (LONG_PTR)Pte - PteBase;
VirtualAddress = (PVOID)
((LONG_PTR)(Index << (PAGE_SHIFT + VA_SHIFT - PTE_SHIFT)) >> VA_SHIFT);
return VirtualAddress;
}
ULONG64
NTAPI
GetKeyOffset(
__in ULONG64 XorKey,
__in ULONG Index
)
{
ULONG64 ReturnKey = 0;
ULONG LastIndex = 0;
ULONG64 LastKey = 0;
LastIndex = PG_KEY_INTERVAL;
LastKey = XorKey;
do {
LastKey = __ROR64(
LastKey,
(LastIndex & 0xff));
if (FALSE != PgIsBtcEncode) {
LastKey = _btc64(LastKey, LastKey);
}
LastIndex--;
if ((Index % PG_KEY_INTERVAL) == LastIndex) {
ReturnKey = LastKey;
break;
}
} while (0 != LastIndex);
return ReturnKey;
}
VOID
NTAPI
SetPgContextField(
VOID
)
{
NTSTATUS Status = STATUS_SUCCESS;
HANDLE FileHandle = NULL;
HANDLE SectionHandle = NULL;
OBJECT_ATTRIBUTES ObjectAttributes = { 0 };
UNICODE_STRING ImageFileName = { 0 };
IO_STATUS_BLOCK IoStatusBlock = { 0 };
PVOID ViewBase = NULL;
SIZE_T ViewSize = 0;
PVOID ImageBase = NULL;
PCHAR ControlPc = NULL;
PCHAR TargetPc = NULL;
ULONG Length = 0;
PIMAGE_SECTION_HEADER NtSection = NULL;
PRUNTIME_FUNCTION FunctionEntry = NULL;
CHAR SectionSig[] = "2e 48 31 11 48 31 51 08 48 31 51 10 48 31 51 18";
CHAR FieldSig[] = "fb 48 8d 05";
CHAR FieldSigEx[] = "?? 89 ?? 00 01 00 00 48 8D 05 ?? ?? ?? ?? ?? 89 ?? 08 01 00 00";
CHAR PgEntrySig[] = "48 81 ec c0 02 00 00 48 8d a8 d8 fd ff ff 48 83 e5 80";
CHAR KiStartSystemThreadSig[] = "b9 01 00 00 00 44 0f 22 c1 48 8b 14 24 48 8b 4c 24 08 ff 54 24 10";
CHAR PspSystemThreadStartupSig[] = "eb ?? b9 1e 00 00 00 e8";
// if os build > win10 (10586) PteBase and PdeBase is random;
CHAR MiGetPteAddressSig[] = "48 c1 e9 09 48 b8 f8 ff ff ff 7f 00 00 00 48 23 c8 48 b8 ?? ?? ?? ?? ?? ?? ?? ?? 48 03 c1 c3";
ImageBase = GetImageHandle("ntoskrnl.exe");
if (NULL != ImageBase) {
RtlInitUnicodeString(
&ImageFileName,
L"\\SystemRoot\\System32\\ntoskrnl.exe");
InitializeObjectAttributes(
&ObjectAttributes,
&ImageFileName,
(OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE),
NULL,
NULL);
Status = ZwOpenFile(
&FileHandle,
FILE_EXECUTE,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_DELETE,
0);
if (NT_SUCCESS(Status)) {
InitializeObjectAttributes(
&ObjectAttributes,
NULL,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwCreateSection(
&SectionHandle,
SECTION_MAP_READ | SECTION_MAP_EXECUTE,
&ObjectAttributes,
NULL,
PAGE_EXECUTE,
SEC_IMAGE,
FileHandle);
if (NT_SUCCESS(Status)) {
Status = ZwMapViewOfSection(
SectionHandle,
NtCurrentProcess(),
&ViewBase,
0L,
0L,
NULL,
&ViewSize,
ViewShare,
0L,
PAGE_EXECUTE);
if (NT_SUCCESS(Status)) {
ControlPc = ScanBytes(
ViewBase,
(PCHAR)ViewBase + ViewSize,
SectionSig);
if (NULL != ControlPc) {
TargetPc = ControlPc;
while (0 != CmpByte(TargetPc[0], 0x41) &&
0 != CmpByte(TargetPc[1], 0xff) &&
0 != CmpByte(TargetPc[2], 0xe0)) {
Length = GetInstructionLength(TargetPc);
if (0 == PgAppendSectionSize) {
if (8 == Length) {
if (0 == CmpByte(TargetPc[0], 0x48) &&
0 == CmpByte(TargetPc[1], 0x31) &&
0 == CmpByte(TargetPc[2], 0x84) &&
0 == CmpByte(TargetPc[3], 0xca)) {
PgAppendSectionSize = *(PULONG)(TargetPc + 4);
if (0 != PgAppendSectionSize) {
PgAppendSection = ExAllocatePool(
NonPagedPool,
PgAppendSectionSize);
if (NULL != PgAppendSection) {
RtlCopyMemory(
PgAppendSection,
ControlPc,
PgAppendSectionSize);
}
}
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > pg context append section size\n",
PgAppendSectionSize);
#endif // !VMP
if (0 == CmpByte(TargetPc[11], 0x48) ||
0 == CmpByte(TargetPc[12], 0x0f) ||
0 == CmpByte(TargetPc[13], 0xbb) ||
0 == CmpByte(TargetPc[14], 0xc0)) {
PgIsBtcEncode = TRUE;
#ifndef VMP
DbgPrint("Soul - Testis - pg context btc encode enable\n");
#endif // !VMP
}
}
}
}
if (6 == Length) {
if (0 == CmpByte(TargetPc[0], 0x8b) &&
0 == CmpByte(TargetPc[1], 0x82)) {
PgEntryRvaOffset = *(PULONG)(TargetPc + 2);
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > pg context entry rva offset\n",
PgEntryRvaOffset);
#endif // !VMP
break;
}
}
TargetPc += Length;
}
}
ControlPc = ViewBase;
while (NULL != ControlPc) {
ControlPc = ScanBytes(
ControlPc,
(PCHAR)ViewBase + ViewSize,
FieldSig);
if (NULL != ControlPc) {
TargetPc = ScanBytes(
ControlPc,
ControlPc + PgEntryRvaOffset,
FieldSigEx);
if (NULL != TargetPc) {
PgContextField[0] = (ULONG64)
((TargetPc - (ULONG64)ViewBase + (ULONG64)ImageBase - 4) +
*(PLONG)(TargetPc - 4) +
sizeof(LONG));
PrintSymbol((PVOID)PgContextField[0]);
PgContextField[1] = (ULONG64)
((TargetPc - (ULONG64)ViewBase + (ULONG64)ImageBase + 10) +
*(PLONG)(TargetPc + 10) +
sizeof(LONG));
PrintSymbol((PVOID)PgContextField[1]);
PgContextField[2] = (ULONG64)
((TargetPc - (ULONG64)ViewBase + (ULONG64)ImageBase + 24) +
*(PLONG)(TargetPc + 24) +
sizeof(LONG));
PrintSymbol((PVOID)PgContextField[2]);
PgContextField[3] = (ULONG64)
((TargetPc - (ULONG64)ViewBase + (ULONG64)ImageBase + 38) +
*(PLONG)(TargetPc + 38) +
sizeof(LONG));
PrintSymbol((PVOID)PgContextField[3]);
break;
}
ControlPc++;
}
else {
break;
}
}
ControlPc = ScanBytes(
ViewBase,
(PCHAR)ViewBase + ViewSize,
PgEntrySig);
if (NULL != ControlPc) {
NtSection = SectionTableFromVirtualAddress(
ViewBase,
ControlPc);
if (NULL != NtSection) {
PgNtSectionSize = max(
NtSection->SizeOfRawData,
NtSection->Misc.VirtualSize);
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > pg context nt section size\n",
PgNtSectionSize);
#endif // !VMP
}
}
ControlPc = ScanBytes(
ViewBase,
(PCHAR)ViewBase + ViewSize,
KiStartSystemThreadSig);
if (NULL != ControlPc) {
TargetPc = ControlPc;
NtosKiStartSystemThread = (PVOID)
(TargetPc - (ULONG64)ViewBase + (ULONG64)ImageBase);
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > KiStartSystemThread\n",
NtosKiStartSystemThread);
#endif // !VMP
}
ControlPc = ScanBytes(
ViewBase,
(PCHAR)ViewBase + ViewSize,
PspSystemThreadStartupSig);
if (NULL != ControlPc) {
TargetPc = (PVOID)
(ControlPc - (ULONG64)ViewBase + (ULONG64)ImageBase);
FunctionEntry = DetourRtlLookupFunctionEntry(
(ULONG64)TargetPc,
(PULONG64)&ImageBase,
NULL);
if (NULL != FunctionEntry) {
NtosPspSystemThreadStartup = (PVOID)
((PCHAR)ImageBase + FunctionEntry->BeginAddress);
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > PspSystemThreadStartup\n",
NtosPspSystemThreadStartup);
#endif // !VMP
}
}
if (OsBuildNumber >= 10586) {
ControlPc = ScanBytes(
ViewBase,
(PCHAR)ViewBase + ViewSize,
MiGetPteAddressSig);
if (NULL != ControlPc) {
TargetPc = (PVOID)
(ControlPc - (ULONG64)ViewBase + (ULONG64)ImageBase);
PteBase = *(PULONG_PTR)(TargetPc + 19);
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > PteBase\n",
PteBase);
#endif // !VMP
}
}
else {
PteBase = PTE_BASE;
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > PteBase\n",
PteBase);
#endif // !VMP
}
ZwUnmapViewOfSection(
NtCurrentProcess(),
ViewBase);
}
ZwClose(SectionHandle);
}
ZwClose(FileHandle);
}
}
}
PVOID
NTAPI
FindExProtectPool(
VOID
)
{
PVOID Result = NULL;
PVOID ImageBase = NULL;
PIMAGE_NT_HEADERS NtHeaders = NULL;
PIMAGE_SECTION_HEADER NtSection = NULL;
PCHAR ControlPc = NULL;
PCHAR TargetPc = NULL;
CHAR Sig[] = "48 8b ?? e8";
CHAR SigEx[] = "ff 0f 00 00 0f 85 ?? ?? ?? ?? 48 8b ?? e8"; // check call MiDeterminePoolType
ImageBase = GetImageHandle("ntoskrnl.exe");
if (NULL != ImageBase) {
NtHeaders = RtlImageNtHeader(ImageBase);
if (NULL != NtHeaders) {
NtSection = IMAGE_FIRST_SECTION(NtHeaders);
ControlPc = (PCHAR)ImageBase + NtSection[0].VirtualAddress;
while (TRUE) {
ControlPc = ScanBytes(
ControlPc,
(PCHAR)ImageBase + NtSection[0].VirtualAddress + NtSection[0].SizeOfRawData,
Sig);
if (NULL != ControlPc) {
TargetPc = ScanBytes(
ControlPc,
ControlPc + 0x100,
SigEx);
if (NULL != TargetPc) {
Result = TargetPc;
TargetPc = (TargetPc + 0xe) +
*(PLONG)(TargetPc + 0xe) + sizeof(LONG);
RtlCopyMemory(
(PVOID)&NtosMmDeterminePoolType,
&TargetPc,
sizeof(PVOID));
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > MmDeterminePoolType\n",
NtosMmDeterminePoolType);
#endif // !VMP
break;
}
}
else {
break;
}
ControlPc++;
}
}
}
return Result;
}
VOID
NTAPI
FindPoolBigPageTable(
VOID
)
{
PVOID ImageBase = NULL;
PCHAR ControlPc = NULL;
PCHAR TargetPc = NULL;
ULONG Length = 0;
PPOOL_BIG_PAGES * PageTable = NULL;
PSIZE_T PageTableSize = NULL;
ControlPc = FindExProtectPool();
if (NULL != ControlPc) {
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > ExProtectPool\n",
ControlPc);
#endif // !VMP
TargetPc = ControlPc;
while (TRUE) {
Length = GetInstructionLength(TargetPc);
if (1 == Length) {
if (0 == CmpByte(TargetPc[0], 0xc3)) {
break;
}
}
if (7 == Length) {
if (0x40 == (TargetPc[0] & 0xf0)) {
if (0 == CmpByte(TargetPc[1], 0x8b)) {
if (NULL == PageTable) {
PageTable = (PPOOL_BIG_PAGES *)
((TargetPc + 3) +
*(PLONG)(TargetPc + 3) +
sizeof(LONG));
if (0 == (ULONG64)*PageTable ||
0 != ((ULONG64)(*PageTable) & 0xfff)) {
PageTable = NULL;
}
}
else if (NULL == PageTableSize) {
PageTableSize = (PSIZE_T)
((TargetPc + 3) +
*(PLONG)(TargetPc + 3) +
sizeof(LONG));
if (0 == *PageTableSize ||
0 != ((ULONG64)(*PageTableSize) & 0xfff)) {
PageTableSize = NULL;
}
}
}
else if (0 == CmpByte(TargetPc[1], 0x8d)) {
if (NULL == LargePoolTableLock) {
LargePoolTableLock = (PEX_SPIN_LOCK)
((TargetPc + 3) +
*(PLONG)(TargetPc + 3) +
sizeof(LONG));
}
}
}
if (0 == CmpByte(TargetPc[0], 0x0f) &&
0 == CmpByte(TargetPc[1], 0x0d) &&
0 == CmpByte(TargetPc[2], 0x0d)) {
if (NULL == LargePoolTableLock) {
LargePoolTableLock = (PEX_SPIN_LOCK)
((TargetPc + 3) +
*(PLONG)(TargetPc + 3) +
sizeof(LONG));
}
}
}
if (NULL != PageTable &&
NULL != PageTableSize &&
NULL != LargePoolTableLock) {
if ((ULONG64)*PageTable > (ULONG64)*PageTableSize) {
PoolBigPageTable = (PPOOL_BIG_PAGES)*PageTable;
PoolBigPageTableSize = (SIZE_T)*PageTableSize;
}
else {
// swap
PoolBigPageTable = (PPOOL_BIG_PAGES)*PageTableSize;
PoolBigPageTableSize = (SIZE_T)*PageTable;
}
#ifndef VMP
DbgPrint(
"Soul - Testis - < %p > PoolBigPageTable\n",
PoolBigPageTable);
DbgPrint(
"Soul - Testis - < %p > PoolBigPageTableSize\n",
PoolBigPageTableSize);
DbgPrint(
"Soul - Testis - < %p > LargePoolTableLock\n",
LargePoolTableLock);
#endif // !VMP
break;
}
TargetPc +=
GetInstructionLength(TargetPc);
}
}
}
PVOID
NTAPI
FindBigPoolPgEntrySig(
__in PVOID VirtualAddress
)
{
PVOID ControlPc = NULL;
ULONG Index = 0;
KIRQL Irql = 0;
CHAR SdbpCheckDll[] =
"48 8b 74 24 30 48 8b 7c 24 28 4c 8b 54 24 38 33 c0 49 89 02 49 83 ea 08 4c 3b d4 73 f4 48 89 7c 24 28 8b d8 8b f8 8b e8 4c 8b d0 4c 8b d8 4c 8b e0 4c 8b e8 4c 8b f0 4c 8b f8 ff e6";
Irql = ExAcquireSpinLockShared(LargePoolTableLock);
for (Index = 0;
Index < PoolBigPageTableSize;
Index++) {
if (POOL_BIG_TABLE_ENTRY_FREE != FlagOn(
(ULONG64)PoolBigPageTable[Index].Va,
POOL_BIG_TABLE_ENTRY_FREE)) {
if (NonPagedPool == NtosMmDeterminePoolType(PoolBigPageTable[Index].Va)) {
if (PoolBigPageTable[Index].NumberOfPages > PgNtSectionSize) {
if ((ULONG64)VirtualAddress >= (ULONG64)PoolBigPageTable[Index].Va &&
(ULONG64)VirtualAddress < (ULONG64)PoolBigPageTable[Index].Va +
PoolBigPageTable[Index].NumberOfPages) {
ControlPc = ScanBytes(
PoolBigPageTable[Index].Va,
(PCHAR)PoolBigPageTable[Index].Va + PoolBigPageTable[Index].NumberOfPages,
SdbpCheckDll);
break;
}
}
}
}
}
ExReleaseSpinLockShared(LargePoolTableLock, Irql);
return ControlPc;
}
VOID
NTAPI
PgEncodeClear(
__in PVOID Reserved,
__in PVOID PgContext
)
{
DbgPrint(
"Soul - Testis - < %p > pg context clear\n",
PgContext);
}
VOID
NTAPI
PgSetEncodeEntry(
__in PVOID PgContext,
__in ULONG64 RorKey
)
{
ULONG64 LastRorKey = 0;
ULONG EntryRva = 0;
ULONG64 FieldBuffer[10] = { 0 };
ULONG FieldIndex = 0;
ULONG Index = 0;
PCHAR ControlPc = NULL;
// xor encode must be align 8 byte;
// get pg entry offset in encode code
FieldIndex = (PgEntryRvaOffset -
PgAppendSectionSize) / sizeof(ULONG64);
RtlCopyMemory(
&FieldBuffer,
(PCHAR)PgContext + (PgEntryRvaOffset & ~7),
sizeof(FieldBuffer));
for (Index = 0;
Index < RTL_NUMBER_OF(FieldBuffer);
Index++) {
LastRorKey = GetKeyOffset(RorKey, FieldIndex + Index);
FieldBuffer[Index] = FieldBuffer[Index] ^ LastRorKey;
}
EntryRva = *(PULONG)((PCHAR)&FieldBuffer + (PgEntryRvaOffset & 7));
// copy pg entry head code to temp bufer and decode
FieldIndex = (EntryRva - PgAppendSectionSize) / sizeof(ULONG64);
RtlCopyMemory(
&FieldBuffer,
(PCHAR)PgContext + (EntryRva & ~7),
sizeof(FieldBuffer));
for (Index = 0;
Index < RTL_NUMBER_OF(FieldBuffer);
Index++) {
LastRorKey = GetKeyOffset(RorKey, FieldIndex + Index);
FieldBuffer[Index] = FieldBuffer[Index] ^ LastRorKey;
}
// set temp buffer pg entry head jmp to _PgEncodeClear an encode
ControlPc = (PCHAR)&FieldBuffer + (EntryRva & 7);
BuildJumpCode(
_PgEncodeClear,
&ControlPc);
for (Index = 0;
Index < RTL_NUMBER_OF(FieldBuffer);
Index++) {
LastRorKey = GetKeyOffset(RorKey, FieldIndex + Index);
FieldBuffer[Index] = FieldBuffer[Index] ^ LastRorKey;
}
// copy temp buffer pg entry head to old address,
// when PatchGuard code decode self jmp _PgEncodeClear.
RtlCopyMemory(
(PCHAR)PgContext + (EntryRva & ~7),
&FieldBuffer,
sizeof(FieldBuffer));
DbgPrint("Soul - Testis - pg context disarmed\n");
}
VOID
NTAPI
PgClearEncodeContext(
__in PVOID VirtualAddress,
__in SIZE_T RegionSize
)
{
PCHAR TargetPc = NULL;
SIZE_T Index = 0;
ULONG64 RorKey = 0;
PULONG64 Field = NULL;
PVOID PgContext = NULL;
TargetPc = VirtualAddress;
while ((ULONG64)TargetPc <
(ULONG64)VirtualAddress + RegionSize - PgAppendSectionSize) {
Field = TargetPc;
if ((ULONG64)Field == (ULONG64)&PgContextField) {
break;
}
RorKey = Field[3] ^ PgContextField[3];
// loc_140D6DECD : ; CODE XREF : CmpAppendDllSection + 98¡ýj
// xor [rdx + rcx * 8 + 0C0h], rax
// ror rax, cl
// if >= win10 17134 btc rax, rax here
// loop loc_140D6DECD
if (0 == RorKey) {
if (Field[2] == PgContextField[2] &&
Field[1] == PgContextField[1] &&
Field[0] == PgContextField[0]) {
PgContext = TargetPc - PG_FIELD_OFFSET;
#ifndef VMP
DbgPrint(
"Soul - Testis - found decode pg context at < %p >\n",
PgContext);
#endif // !VMP
break;
}
}
else {
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
if ((ULONG64)(Field[2] ^ RorKey) == (ULONG64)PgContextField[2]) {
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 1);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
if ((ULONG64)(Field[1] ^ RorKey) == (ULONG64)PgContextField[1]) {
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 2);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
if ((ULONG64)(Field[0] ^ RorKey) == (ULONG64)PgContextField[0]) {
PgContext = TargetPc - PG_FIELD_OFFSET;
RorKey = __ROR64(Field[0] ^ PgContextField[0], PG_FIELD_ROL_BITS - 3);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 4);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 5);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 6);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 7);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 8);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 9);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
RorKey = __ROR64(RorKey, PG_FIELD_ROL_BITS - 10);
if (FALSE != PgIsBtcEncode) {
RorKey = _btc64(RorKey, RorKey);
}
DbgPrint(
"Soul - Testis - found encode pg context at < %p > RorKey < %p >\n",
PgContext,
RorKey);
PgSetEncodeEntry(PgContext, RorKey);
break;
}
}
}
}
TargetPc++;
}
}
PRTL_BITMAP
NTAPI
FindSystemPageBitmap(
VOID
)
{
PRTL_BITMAP Bitmap = NULL;
PVOID ImageBase = NULL;
PCHAR ControlPc = NULL;
PCHAR TargetPc = NULL;
ULONG Length = 0;
ImageBase = GetImageHandle("ntoskrnl.exe");
if (NULL != ImageBase) {
ControlPc = GetProcedureAddress(
ImageBase,
"MmAllocateMappingAddress",
0);
if (NULL != ControlPc) {
while (TRUE) {
Length = GetInstructionLength(ControlPc);
if (1 == Length) {
if (0 == CmpByte(ControlPc[0], 0xc3)) {
break;
}
}
if (7 == Length) {
if (0 == CmpByte(ControlPc[0], 0x48) &&
0 == CmpByte(ControlPc[1], 0x8d) &&
0 == CmpByte(ControlPc[2], 0x0d)) {
TargetPc = RVA_TO_VA(ControlPc + 3);
if (FALSE != MmIsAddressValid(TargetPc)) {
// MiKernelStackPteInfo->Header
Bitmap = TargetPc;
}
break;
}
}
ControlPc += Length;
}
}
}