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Message-ID:	<51EED4B4.7000908@cwilson.fastmail.fm>
Date:	Tue, 23 Jul 2013 15:08:36 -0400
From:	Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
Subject:	Re: setup-x86_64: postinstall errors: Package bash 1, Package a2ps 2 and xinit 134
References:	<CADex0xx+uY6Y8ngZ3tUsYr+KPi0t0+H+H7X-civ-iq0diuJfZw AT mail DOT gmail DOT com> <51EE0951 DOT 90007 AT users DOT sourceforge DOT net> <51EEC7F2 DOT 5000402 AT cwilson DOT fastmail DOT fm> <20130723184615 DOT GK9689 AT calimero DOT vinschen DOT de>
In-Reply-To:	<20130723184615.GK9689@calimero.vinschen.de>

On 7/23/2013 2:46 PM, Corinna Vinschen wrote:
> On Jul 23 14:14, Charles Wilson wrote:
>>> I believe your report has to do with error handling when attempting
>>> to modify the All User's Desktop, when you don't actually retain the
>>> elevated permissions necessary to do so.

>> Is there are way for setup.exe to
>> delegate its elevated credentials down to /bin/bash, and thence to
>> mkshortcut.exe? Otherwise, even the *fix* for this bug will just
>> make it not hang or crash; it will still fail to modify the
>> all-users start menu/desktop.
>
> Setup does not give up any of it's permissions when starting the
> postinstall scripts via CreateProcess.  The scripts have the same
> permissions as setup itself, which makes a lot of sense if you think
> about it.  Missing permissions to change system dirs should only occur
> if setup has been started as non-admin, or if the UAC installer
> recognition has been switched off (affects only the 32 bit version).

But even if /bin/bash is elevated, it doesn't follow that any of the 
tools launched within a script -- via cygwin's fork/exec method -- ALSO 
retain that elevation.

Does it?

--
Chuck


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