static readonly byte[] returnTrue = new byte[] { 0x6A, 0x01, 0x58, 0xC3 }; // push 1 / pop eax / retn
static bool WriteBytes(CorProcess process, ulong addr, byte[] data)
{
if (process == null || addr == 0 || data == null)
{
return(false);
}
var hProcess = process.Handle;
uint oldProtect;
if (!NativeMethods.VirtualProtectEx(hProcess, new IntPtr((long)addr), data.Length, NativeMethods.PAGE_EXECUTE_READWRITE, out oldProtect))
{
return(false);
}
int sizeWritten;
try {
process.WriteMemory(addr, data, 0, data.Length, out sizeWritten);
}
finally {
NativeMethods.VirtualProtectEx(hProcess, new IntPtr((long)addr), data.Length, oldProtect, out oldProtect);
}
return(sizeWritten == data.Length);
}
/// <summary>
/// Writes a new value. Can be called if <see cref="IsGeneric"/> is true
/// </summary>
/// <param name="data">Data</param>
/// <param name="process">Process to use if first method call fails</param>
/// <returns></returns>
public unsafe int WriteGenericValue(byte[] data, CorProcess process = null)
{
if (data == null || (uint)data.Length != Size)
{
return(-1);
}
var g = obj as ICorDebugGenericValue;
if (g == null)
{
return(-1);
}
int hr;
fixed(byte *p = &data[0])
{
// This sometimes fails with CORDBG_E_CLASS_NOT_LOADED (ImmutableArray<T>, debugging VS2017).
// If it fails, use process.WriteMemory().
hr = g.SetValue(new IntPtr(p));
if (hr < 0 && process != null)
{
hr = process.WriteMemory(address, data, 0, data.Length, out var sizeWritten);
if (sizeWritten != data.Length && hr >= 0)
{
hr = -1;
}
}
}
return(hr);
}
