Simple test w/ data execution

gistfile1.txt

// ExecuteSomeCode.cpp : Defines the entry point for the console application.
//

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

typedef int (__stdcall MyFunctionType)(int a, int b, int c);

static int test(int a)
{
	return 12 * a;
}

static int __stdcall MyFunction(int a, int b, int c)
{
	return test(a) * b * c;
}

static void __stdcall MyFunction_END() {}

void ExecFuncInMem()
{
	printf("%p %p\n", MyFunction, MyFunction_END);

	UINT size = (UINT)MyFunction_END - (UINT)MyFunction + 1;
	BYTE* mem = (BYTE*)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
	memcpy(mem, MyFunction, size);
	MyFunctionType* mf = (MyFunctionType*)mem;
	int result = mf(2, 3, 4);
	printf("%d\n", result);
}


int _tmain(int argc, _TCHAR* argv[])
{
	ExecFuncInMem();
	getchar();
	return 0;
}