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Date: Sat, 11 Apr 2015 14:35:42 +0200
From: David Macek <david DOT macek DOT 0 AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: [TESTERS needed] New POSIX permission handling
References: <20150410100703 DOT GA4401 AT calimero DOT vinschen DOT de> <87lhhzcarc DOT fsf AT Rainer DOT invalid> <5528E2ED DOT 7090105 AT gmail DOT com> <20150411095958 DOT GD19111 AT calimero DOT vinschen DOT de>
In-Reply-To: <20150411095958.GD19111@calimero.vinschen.de>
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On 11. 4. 2015 11:59, Corinna Vinschen wrote:
>> Out of curiosity, does the code somehow distinguish ACLs that don't
>> have these default permissions (or have different permissions set for
>> SYSTEM / Administrators)?
>=20
> I don't quite understand the question.
>=20
> For a start, I'd like to point out how POSIX ACLs are supposed to work.
> http://linux.die.net/man/5/acl is a good start.  This is our role model.

I'm gonna read that.

>   The new code will compute the mask the same way as before, but it
>   skips the permissions of SYSTEM and Administrators while doing that.
>   That means, the POSIX group permission bits are not affected by
>   the Windows-typical permissions of SYSTEM and Administrators.
>=20
>   Example:
>=20
>     User            rw-
>     Primary group   r--
>     Other user      rw-
>     Other group     r--
>     SYSTEM          rwx
>     Everyone        ---
>=20
>   The computed POSIX MASK/CLASS_OBJ value in Cygwin 1.7.35 is the sum
>   of all group and secondary user permissions
>=20
>     rw- | r-- | rwx =3D=3D rwx
>=20
>   The new code ignores SYSTEM, thus the mask is
>=20
>     rw- | r-- =3D=3D rw-
>=20=20=20=20=20=20
> Does this explain it sufficiently?

Yes, thank you. My question was about the case where SYSTEM or Administrato=
r doesn't have the typical permissions. From this explanation, I assume tha=
t I won't be able to see any difference in the mask in that case, but it do=
esn't seem to be a bad thing.

--=20
David Macek


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