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 Wed, 07 Apr 2021 22:48:45 -0700 (PDT)
Subject: Re: A problem with noacl+umask+chmod result
To: cygwin AT cygwin DOT com
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Date: Thu, 8 Apr 2021 07:48:44 +0200
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From: Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
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On 07.04.2021 22:47, Orgad Shaneh via Cygwin wrote:
> Hi,
> 
> If a filesystem is mounted with noacl, calling chmod to add write
> permissions after umasking this permission doesn't work. Demonstrated
> with command-line and C++.
> 
> Did I miss something or is this a real bug? According to umask man, it
> should only affect newly created files and directories, but I didn't
> find anything that relates to chmod.
> 

without ACL you can not expect the POSIX scheme to properly work.

see

https://cygwin.com/cygwin-ug-net/ntsec.html
to understand how Cygwin uses ACL to mimic POSIX premissions

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