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Date:	Mon, 12 May 2014 15:15:37 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Baffled: is it Cygwin (64-bits) or Windows that causes the invocation of regedit (from bash) to fail?
Message-ID:	<20140512131537.GD2436@calimero.vinschen.de>
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On May 12 23:00, Shaddy Baddah wrote:
> On 2014-05-12 22:50+1000, Corinna Vinschen wrote:
> >On May 12 14:20, Houder wrote:
> >>  - furthermore, using secpol.msc, I have set the ConsentPromptBehavior=
Admin field in
> >>
> >>    HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System (key=
 in registry)
> >>
> >>    to zero, meaning 'elevate without prompting'
> >
> >Doesn't matter.  The problem is that elevating is a special procedure,
> >requiring a special form of ShellExecuteEx function, which doesn't
> >integrate well with the requirements of POSIX fork/exec.  Therefore
> >Cygwin never calls ShellExecuteEx to fork/exec an application, rather it
> >calls CreateProcess/CreateProcessAsUser, both of which don't provide a
> >way to elevate a process.  Therefore, to elevate a process from a Cygwin
> >shell, the shell must already run elevated (e.g., right click on "Cygwin
> >Terminal" -> "Run as Administrator...").
> >
> >What's really annoying:  RegEdit's mainfest does not request "asAdmin"
> >rights.  Rather it only requests "MaximumAllowed".  One would think this
> >means that a CreateProcess call would simply continue with the current
> >permissions of the user.  Not so, unfortunately.
>=20
> I am not sure which Edition it started in, but I believe regedit opens
> as the invoking user from Windows 8.1 at least (perhaps 8, I have a
> vague recollection).

Not on my Windows 8.1.  Here's the excerpt from regedit's manifest:

  "<trustInfo xmlns=3D""urn:schemas-microsoft-com:asm.v3"">\r\n"
  "    <security>\r\n"
  "        <requestedPrivileges>\r\n"
  "            <requestedExecutionLevel\r\n"
  "                level=3D""highestAvailable""\r\n"
  "                uiAccess=3D""false""\r\n"
  "            />\r\n"
  "        </requestedPrivileges>\r\n"
  "    </security>\r\n"
  "</trustInfo>\r\n"

Ok, so it's called "highestAvailable", not "MaximumAllowed", but you
get the idea.  If I call regedit from the non-elevated command line
I get:

  $ regedit
  /cygdrive/c/WINDOWS/regedit: Permission denied.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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