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Date:	Sat, 13 Sep 2014 00:50:44 +0200
From:	Christian Franke <Christian DOT Franke AT t-online DOT de>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Cannot exec() program outside of /bin if PATH is unset
References:	<5413271B DOT 1010109 AT t-online DOT de> <54134A83 DOT 80107 AT redhat DOT com> <54135451 DOT 3060902 AT t-online DOT de> <601154762 DOT 20140913012935 AT yandex DOT ru>
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Andrey Repin wrote:
>> Hmm... is postfix actually broken?
>> Unsetting PATH is IMO sane (from the POSIX POV) if all exec() calls use
>> absolute path names.
> If all exec() calls are made with full paths, unsetting $PATH does not improve
> security in any way,

Of course. But postfix could be configured to run "unknown" external 
programs through its various daemons. In this case, a fixed (here: 
empty) PATH improves security. If not convinced, please discuss with the 
author of postfix :-)


> but leave underlying system in an inconsistent state.

I don't see any added inconsistencies, please explain.


> This is not limited to Cygwin1.dll, but to all other system DLL's that you
> might need to load.

No. The "system" (aka "Windows") DDLs are always found due to the 
built-in defaults which *precede* PATH:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms682586.aspx

The Cygwin "system" DLLs may be not found if PATH is modified/unset, 
therefore I suggested to fix this by a SetDllDirectory() call.


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