bug#12632: file permissions checking mishandled when setuid

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Wed, 24 Oct 2012 00:15:09 +0100
> 
> FYI it is documented - see "Win32 Device Namespaces":
> http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx
> 
> Of course as Eli suggests, this documentation may not be the whole
> story, as you still need to know which names and namespaces are
> supported by a given API (and on which versions of Windows).

That's one thing that's missing, yes.  Another is how exactly a file
name of an arbitrary form is normalized by each API, which is exactly
the issue here.