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Message-ID: | <5370C60B.6080304@shaddybaddah.name> |
Date: | Mon, 12 May 2014 23:00:59 +1000 |
From: | Shaddy Baddah <lithium-cygwin AT shaddybaddah DOT name> |
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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? |
References: | <849f1f5420ebf77d7a591d6c9b6bfa4b DOT squirrel AT webmail DOT xs4all DOT nl> <536E339A DOT 6030200 AT breisch DOT org> <6f9d939cc604437def11828435a67f96 DOT squirrel AT webmail DOT xs4all DOT nl> <20140512125054 DOT GC2436 AT calimero DOT vinschen DOT de> |
In-Reply-To: | <20140512125054.GC2436@calimero.vinschen.de> |
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Hi, On 2014-05-12 22:50+1000, Corinna Vinschen wrote: > On May 12 14:20, Houder wrote: >> Of course, it is not really a problem, that regedit cannot be invoked from Cygwin, as it can >> be invoked from the Windows interface ... >> >> However, in some of the "harder" cases of using Gygwin, one needs to have a "mental" model of >> how Cygwin "integrates" with Windows (is my belief) ... and as far I understand the matter, I >> was surprised to find that I could not invoke regedit from bash. >> >> Consequently, I decided to investigate why I got the denial (64-bits Cygwin) at my end. >> >> First of all, some more info about my "environment": >> >> - I am using Cygwin from Windows 7 ... >> - I am using Cygwin from an administrative account ... >> - furthermore, using secpol.msc, I have set the ConsentPromptBehaviorAdmin 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. 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). -- Regards, Shaddy -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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