Sanity check on SetEntriesInAcl() and/or SetSecurityInfo() setup.

[mjr4077au]

Hi there. I'm the lead developer for PSAppDeployToolkit. We leverage CsWin32 extensively within our project, but I've had some issues with SetEntriesInAcl() and/or SetSecurityInfo().

I committed the following implementation to so that users don't have privileges to terminate a process we start using their token from SYSTEM: PSAppDeployToolkit/PSAppDeployToolkit@6014f8b. On paper, everything looks right but I continually get a Win32Exception from SetSecurityInfo() saying "The access control list (ACL) structure is invalid.". This issue only occurred when I was passing the out'd ACL from SetEntriesInAcl(). If I sent null through for this, no error occurs.

I ended up rolling my own P/Invokes that work with IntPtr types, etc, and the setup works as expected. No errors, and a successful outcome: PSAppDeployToolkit/PSAppDeployToolkit@dcb0324. Can anyone see where I went wrong in the first commit? Everything looks 100% correct to me.

[mjr4077au]

I've gone back to using CsWin32 for these, but the bare P/Invokes. The wrappers for these two P/Invokes, along with the wrapper for GetNamedSecurityInfo() (as reported via #1451) just aren't right so I've had to make my own SafeHandle wrappers correctly. All's now well in the world.