Group Permissions on root folders problem (Windows 10 TP build 10061)

[Ken Brown]

On 9/10/2015 11:49 AM, David A Cobb wrote:
> On a Windows-10 host: when I use Cygwin *chown***or *chmod *to make
> permission changes, the next time I access the folder-tree from Windows
> Explorer Security tab, it complains that the Access Control List is
> incorrectly ordered and that will cause undesirable results; happy to
> say, it gives me the chance to re-order the ACL.  The usual undesirable
> result is that an app can create a folder /New/ within /T/ but cannot
> create anything within /T/////New/.
>
> Hypothesis: we are indirectly(?) modifying the ACL but are not observing
> whatever Windows expects for ordering.  I know that Windows enforces
> "*deny*" rules before any "*allow*" rules; I do not know what other
> ordering it observes.  I do know that Windows doesn't really consider
> the "group" property the same way POSIX does, FWIW.

This is explained in the Cygwin User's Guide:

   https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-files

Ken

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