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Date: Fri, 10 Feb 2023 19:41:26 +0100
To: Norton Allen <allen AT huarp DOT harvard DOT edu>
Subject: Re: chmod g+ws unsuccessful, "NULL SID" icacls missing
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>,
        "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
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On Feb 10 11:42, Norton Allen via Cygwin wrote:
> On 2/9/2023 4:09 PM, Corinna Vinschen wrote:
> > On Feb  9 13:25, Norton Allen via Cygwin wrote:
> > > On 2/8/2023 4:05 PM, Norton Allen via Cygwin wrote:
> > > > [...]
> > > > The problem:
> > > > 
> > > > $ chmod g+ws fails to set the 's' bit, and the resulting icacls output
> > > > does not contain any "NULL SID" entries. I am seeing the same problem on
> > > > (at least) two different systems setup by my organization. One of these
> > > > was just re-imaged and I installed Cygwin yesterday with no customized
> > > > configurations. AV is Windows Defender, but I suspect if that were the
> > > > culprit, there would have been more noise.
> > > > [...]
> > > [...]
> > > Any idea what g+s should be doing? Any more/better information I can
> > > provide?
> > What you observe is a bug in Cygwin, plain and simple.  Without going
> > into too much detail, part of the problem could never be observed with
> > older coreutils, which we had to live with for much too long in the
> > Cygwin distro.  The newer coreutils handles permissions slightly
> > differently and that dropped the mask from the buggy code.
> > 
> > I applied a patch which, hopefully, fixes this problem (in fact, plural,
> > "these problems").
> > 
> > A new Cygwin test release 3.5.0-0.162.g498fce80ef33 is just being built
> > and should be up in an hour or so.  You can simply install it via
> > Cygwin's setup tool as soon as it's on your favorite mirror.
> > 
> > If it works as desired, it will be part of the next Cygwin bugfix
> > release 3.4.6.
> 
> Corinna,
> 
> The fix seems to work like a charm! And I am happy to be wrong about the
> source of the problem.

Great, thanks for testing!


Corinna

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