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Date: Wed, 08 Oct 2014 19:15:57 +0200
From: Christian Franke <Christian.Franke@t-online.de>
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To: cygwin@cygwin.com
Subject: Re: Cannot exec() program outside of /bin if PATH is unset
References: <5413271B.1010109@t-online.de> <54134A83.80107@redhat.com> <54135451.3060902@t-online.de> <601154762.20140913012935@yandex.ru> <541378C4.6030705@t-online.de> <54137BDE.6040907@redhat.com> <54137C7F.1040507@redhat.com> <541415B1.8090500@t-online.de> <541698CC.7090802@lysator.liu.se> <5416F946.7010905@t-online.de> <20141008134106.GF29235@calimero.vinschen.de>
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Corinna Vinschen wrote:
> On Sep 15 16:35, Christian Franke wrote:
>> ...
> I'm somewhat reluctant to add a call to SetDllDirectory to the Cygwin
> DLL for two reasons.
>
> - Calling SetDllDirectory with an explicit dir doesn't just add this dir
>    to the search path, it also removes the CWD from the search path.
>    While I agree that this is a good thing from a security POV, can we be
>    sure that this behaviour isn't needed somewhere, by somebody?
>
> - The fact that SetDllDirectory affects searching linked DLLs in calls
>    to CreateProcess is undocumented.  Per the original MSDN pages,
>    SetDllDirectory affects calls to LoadLibrary and LoadLibraryEx, but
>    not linked DLLs when starting a child process.  The latter is only
>    mentioned in a Community Addition:
>
>    http://msdn.microsoft.com/en-us/library/windows/desktop/ms686203%28v=vs.85%29.aspx
>
> Having said that, we can certainly test this, but I'm wondering
> if an upstream Cygwin patch might be ok.  Something similar has been
> applied to the portable OpenSSH repository years ago, so there's
> precedent.

We could leave this open for now. I already added an easy workaround to 
postfix
(add PATH=/usr/bin to import/export_environment default settings).

Christian


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