X64 HOOK IDT
kd> dt nt!_KIDTENTRY64 @idtr + @@(sizeof(nt!_KIDTENTRY64))+0x000 OffsetLow: 0x44c0
+0x002 Selector : 0x10
+0x004 IstIndex : 0y000
+0x004 Reserved0: 0y00000 (0)
+0x004 Type : 0y01110 (0xe)
+0x004 Dpl : 0y00
+0x004 Present : 0y1
+0x006 OffsetMiddle : 0x40e
+0x008 OffsetHigh : 0xfffff800
+0x00c Reserved1: 0
+0x000 Alignment: 0x40e8e00`001044c0
kd> !idt 1
Dumping IDT:
01: fffff800040e44c0 nt!KiDebugTrapOrFault
#pragma pack(1)
typedef struct{
USHORT limit;
ULONG64 BASE;
}IDT_INFO,*PIDT_INFO;
typedef union _KIDTENTRY64
{
struct
{
USHORT OffsetLow;
USHORT Selector;
USHORT IstIndex : 3;
USHORT Reserved0 : 5;
USHORT Type : 5;
USHORT Dpl : 2;
USHORT Present : 1;
USHORT OffsetMiddle;
ULONG OffsetHigh;
ULONG Reserved1;
};
UINT64 Alignment;
} KIDTENTRY64, *PKIDTENTRY64;
#pragma pack()
typedef NTSTATUS(NTAPI *_KeSetAffinityThread)(
IN PKTHREAD Thread,
IN KAFFINITY Affinity
);
NTSTATUS HOOKIDT(ULONG IDTID, PVOID NewfcuncAddress,__out PVOID * oldTRAP1){
KIRQL oldIrql;
ULONG lowpart;
KAFFINITY processOrs;
PKTHREAD thread;
LONG i;
IDT_INFO idtinfo;
ULONG_PTR oldTrap = 0;
ULONG_PTR newTrap;
KIDTENTRY64*idt_entry;
UNICODE_STRING ustrKeSetAffinityThread;
_KeSetAffinityThread KeSetAffinityThread;
RtlInitUnicodeString(&ustrKeSetAffinityThread, L"KeSetAffinityThread");
KeSetAffinityThread = (_KeSetAffinityThread)MmGetSystemRoutineAddress(&ustrKeSetAffinityThread);
processOrs = KeQueryActiveProcessors();
thread = KeGetCurrentThread();
newTrap = (ULONG_PTR)NewfcuncAddress;
if (!MmIsAddressValid(oldTRAP1))
{ return 1; }
for (i = 0; i < 32; i++){
KAFFINITY curProc = processOrs &(1 << i);
if (curProc != 0){
KeSetAffinityThread(thread, curProc);
__sidt(&idtinfo);
idt_entry = idtinfo.BASE;
oldTrap = (ULONG_PTR)((((ULONGLONG)idt_entry.OffsetHigh) << 32) | (ULONGLONG)(((idt_entry.OffsetMiddle << 16) | idt_entry.OffsetLow) & 0x00000000ffffffff));
if ( *oldTRAP1 == NULL)
{
*oldTRAP1 = (PVOID)oldTrap;
}
KeRaiseIrql(HIGH_LEVEL, &oldIrql);
lowpart = (ULONG)((ULONGLONG)(newTrap));
idt_entry.OffsetLow = (USHORT)lowpart;
idt_entry.OffsetMiddle = (USHORT)(lowpart >> 16);
idt_entry.OffsetHigh = (ULONG)((ULONGLONG)newTrap >> 32);
KeLowerIrql(oldIrql);
}
}
KeSetAffinityThread(thread, processOrs);
return STATUS_SUCCESS;
}
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