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Date: Sat, 07 Mar 2015 10:03:11 +0100
From: Thomas Wolff <towo AT towo DOT net>
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Subject: Re: [ANNOUNCEMENT] Updated: Cygwin 1.7.35-1
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Am 06.03.2015 um 13:51 schrieb Achim Gratz:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
>> - Change handling of group permissions if owner SID == group SID.  Now the
>>    group permissions don't mirror the user permissions anymore, thus leading
>>    to less hassle with security-conscious applications.
> There's another tricky situation that is not yet handled:
>
> If the file is owned by myself and I'm in a group that allows full access
> (but not ACL modifications), Cygwin will show that file as having mode
> "---rwx---+".  Applications that follow POSIX semantics will interpret that
> file as unreadable by the owner (==current user) and skip checking the group
> permissions, while NTFS will still happily grant that access.
This may happen on Linux as well. Just tested on a NAS runnig Debian, in 
a "share" partition:
echo bla > x
chmod -rw x
ls -l x
---------- 1 towo share 4 Mar  7 09:59 x
cat x
bla

The same file mounted on Windows and handled by cygwin is also readable.

> So in that situation the group permissions need to be promoted to the owner permissions.
I see no need to be more posixly here than other POSIX systems.
------
Thomas

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