InvalidArgument4 Error in NtFreeVirtualMemory Routine

When calling SharpSploit.Execution.DynamicInvoke.Generic.GetSyscallStub() the call to NtFreeVirtualMemory returns an NTSTATUS = STATUS_INVALID_PARAMETER_4 (0xC00000F2).

I was attempting to call "NtAllocateVirtualMemory" this way:

``
IntPtr pSyscall = SharpSploit.Execution.DynamicInvoke.Generic.GetSyscallStub("NtAllocateVirtualMemory");
``

This eventually causes this function to be called:

``
Native.NtFreeVirtualMemory((IntPtr)(-1), ref pImage, ref RegionSize, Execute.Win32.Kernel32.AllocationType.Reserve);
``

The error that was being returned was the catch-all error in Native.cs:

``
if (retValue != Execute.Native.NTSTATUS.Success)
{
// STATUS_OBJECT_TYPE_MISMATCH == 0xC0000024
throw new InvalidOperationException("There is a mismatch between the type of object that is required by the requested operation and the type of object that is specified in the request.");
}
``

Calling this code path, there is nothing that I can do to influence the variable type being used for the call to NtFreeVirtualMemory. I was able to add in an extra condition to get it to ignore the error as a work-around. It seems to not like the "Execute.Win32.Kernel32.AllocationType" being passed?

Start at SharpSploit.Execution.DynamicInvoke.Generic.GetSyscallStub() and follow the call into Native.cs, focusing on the NtFreeVirtualMemory invocation and its NTSTATUS handling. Reproduce the NtAllocateVirtualMemory path described in the issue, then verify that the call no longer returns STATUS_INVALID_PARAMETER_4 and that genuine failures remain reported correctly.

Scritto dal modello di indicizzazione a partire dal testo della issue.