Trigger STATUS_GUARD_VIOLATION

//http://waleedassar.blogspot.com
//http://www.twitter.com/waleedassar
//Code to trigger STATUS_GUARD_PAGE_VIOLATION in a nerdy way.
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#define ThreadBasicInformation 0x0
struct THREAD_BASIC_INFORMATION
{
        unsigned long ExitStatus;
        unsigned long TEBAddress;
        unsigned long shit[0x5]; //Only to preserve the structure's size
};
extern "C"
{
        int __stdcall ZwQueryInformationThread(HANDLE,unsigned long,THREAD_BASIC_INFORMATION*,unsigned long,unsigned long*);
}
int dummy()
{
    int x=0;
    int y=x+1;
    Sleep(INFINITE);
    return y;
}
int __cdecl Handler(EXCEPTION_RECORD* pRec,void* est,unsigned char* pContext,void* disp)
{
    if(pRec->ExceptionCode==0x80000001)
    {
        MessageBox(0,"Expected","waliedassar",0);
        ExitProcess(0);
    }
    return ExceptionContinueSearch;
}
void main()
{
    //--------------Install Exception Handler----------------------------
    __asm
    {
        push offset Handler
        push dword ptr fs:[0x0]
        mov dword ptr fs:[0x0],esp
    }
    //-------------Create a new thread and extract some info------------
    unsigned long tid=0;
    HANDLE h=CreateThread(0,0x1000,(LPTHREAD_START_ROUTINE)&dummy,0,0,&tid);
    if(!h) return;
    printf("Thread %x has been created.\r\n",tid);
    THREAD_BASIC_INFORMATION TBI={0};
    ZwQueryInformationThread(h,ThreadBasicInformation,&TBI,sizeof(TBI),0);
    printf("Thread TEB at %x\r\n",TBI.TEBAddress);
    char* p=(char*)(TBI.TEBAddress);
    unsigned long StackBase=*(unsigned long*)(p+0x4);
    unsigned long StackCurrPointer=*(unsigned long*)(p+0x8);
    printf("Thread Stack base: %x\r\n",StackBase);
    printf("Thread Stack Current: %x\r\n",StackCurrPointer);
    //--------------Trigger the STATUS_GUARD_VIOLATION------------------
    MEMORY_BASIC_INFORMATION MBI={0};
    if(VirtualQuery((void*)(StackCurrPointer-0x1000),&MBI,sizeof(MBI)))
    {
         printf("Protect: %x\r\n",MBI.Protect);
         unsigned long px=StackCurrPointer-0x1000;
         unsigned char x=*(unsigned char*)px;
    }
    //--------------------------------------------------------------
    ExitProcess(0);
}