调用门提权

//他妈的，调试蓝屏了几十次
//解决错误 IRQL_XXXX 蓝屏
//程序进Ring0后应该用KeRaiseIrqlToDpcLevel()提升中断请求级别至DpcLevel退出Ring0前调用KeLowerIrql()降权

#include "stdafx.h"
#include<Windows.h>

DWORD dwBuffer = 0;
BYTE GDT[6] = {0};

//eq gdtr+8*9 0040ec00`00081020
void __declspec(naked) CallGate1()
{
    _asm
    {
        int 3
        retf
    }
}

//eq gdtr+8*9 0040ec00`00081020
//eq gdtr+8*9 0040ec00`0008d4a0
void __declspec(naked) CallGate2()
{
    _asm
    {
        //int 3
        pushad
        pushfd

        //mov dwBuffer,ebx
        //mov eax,0x8003f00c
        //mov ebx,[eax]

        sgdt GDT

        popad
        popfd
        retf
    }
}

void PrintRes()
{
    printf("dwBuffer=%x\n",dwBuffer);
    printf("GDTR=%x\tGDTL=%x\n",*(DWORD*)&GDT[2],*(WORD*)GDT);
}

int main()
{
    BYTE buffer[6] = { 0 };
    *(DWORD*)&buffer[0] = 0x12345678;
    *(WORD*)&buffer[4] = 0x48;
    
    _asm
    {
        pushad
        pushfd
        call fword ptr [buffer]
        popfd
        popad
    }

    PrintRes();
    getchar();

    return 0;
}