Is it possible to execute an x86 assembly sequence from within C#?
assembly, c#
Solution
Just to counter Brian's claim, rewritten code from leppie's answer link:
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace DynamicX86
{
class Program
{
const uint PAGE_EXECUTE_READWRITE = 0x40;
const uint MEM_COMMIT = 0x1000;
[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);
private delegate int IntReturner();
static void Main(string[] args)
{
List<byte> bodyBuilder = new List<byte>();
bodyBuilder.Add(0xb8);
bodyBuilder.AddRange(BitConverter.GetBytes(42));
bodyBuilder.Add(0xc3);
byte[] body = bodyBuilder.ToArray();
IntPtr buf = VirtualAlloc(IntPtr.Zero, (uint)body.Length, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
Marshal.Copy(body, 0, buf, body.Length);
IntReturner ptr = (IntReturner)Marshal.GetDelegateForFunctionPointer(buf, typeof(IntReturner));
Console.WriteLine(ptr());
}
}
}
Problem
Continuing my reverse engineering education I've often wanted to be able to copy portions of x86 assembly code and call it from a high level language of my choice for testing. Does anyone know of a method of calling a sequence of x86 instructions from within a C# method? I know that this can be done using C++ but I'm curious if it can be done in C#? Note: I'm not talking about executing MSIL instructions. I'm talking about executing a series of raw x86 assembly instructions.