DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org D46F6384A026
Subject: Re: chmod issue on 3.1.7.
To: cygwin AT cygwin DOT com
References: <7cb8ee6c7e9a36a3c1ee73def342bcb6 AT mail DOT kylheku DOT com>
 <dbf863dfebf0ed48ed5514d9b3b2ca64 AT mail DOT kylheku DOT com>
Message-ID: <4fe8b717-ada1-16b5-f739-7d43b2a4d56c@cornell.edu>
Date: Thu, 24 Dec 2020 17:56:10 -0500
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.5.1
In-Reply-To: <dbf863dfebf0ed48ed5514d9b3b2ca64@mail.kylheku.com>
Content-Language: en-US
MIME-Version: 1.0
X-MS-Exchange-MessageSentRepresentingType: 1
Received: from [10.13.22.7] (65.112.130.200) by
 BN6PR19CA0107.namprd19.prod.outlook.com (2603:10b6:404:a0::21) with Microsoft
 SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.3700.27 via Frontend Transport; Thu, 24 Dec 2020 22:56:10 +0000
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: fa0cbbfa-676d-4184-f6e5-08d8a85f1b99
X-MS-TrafficTypeDiagnostic: MN2PR04MB5632:
X-Microsoft-Antispam-PRVS: <MN2PR04MB56329C15AF2A7E7C136D9334D8DD0 AT MN2PR04MB5632 DOT namprd04 DOT prod DOT outlook DOT com>
X-MS-Oob-TLC-OOBClassifiers: OLM:5236;
X-MS-Exchange-SenderADCheck: 1
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:;
 IPV:NLI; SFV:NSPM; H:MN2PR04MB6176.namprd04.prod.outlook.com; PTR:; CAT:NONE;
 SFS:(4636009)(39860400002)(376002)(396003)(366004)(346002)(136003)(16526019)(478600001)(4001150100001)(31696002)(86362001)(36756003)(83380400001)(6916009)(75432002)(16576012)(2906002)(66556008)(66946007)(31686004)(66476007)(956004)(26005)(52116002)(53546011)(316002)(2616005)(8936002)(8676002)(5660300002)(6486002)(186003)(966005)(786003)(7116003)(43740500002)(45980500001);
 DIR:OUT; SFP:1102; 
X-MS-Exchange-AntiSpam-MessageData: =?Windows-1252?Q?Iwxs6ssYVH7MgfrDfYzaaQ/2sY+MjnTTHG/puHGp6sBxA3C9QCJzL4YV?=
 =?Windows-1252?Q?DU1fTlTWwiGbxGCdXK2zKwFJ85h/OgFo3fgYlDXU2bGeUlY9yZomLF6Q?=
 =?Windows-1252?Q?tG1CGbKeud1myZW9CQRRDOGzBsmdsP5Fkb9OHIqGMOifhH3yrywJbMmv?=
 =?Windows-1252?Q?0tdHjBN/ucVDTRm/vLlHVrdxB9j85bFICL1AfB/+AVqF8k8RYzYbaNaa?=
 =?Windows-1252?Q?dshZYzRa8s0IWNVELo2WoaVmLVCUdlS/movWohVzUyAoFH92ZGTXH5Q7?=
 =?Windows-1252?Q?wJIGnmgr0vadDJKqNJFmfZSqz9hzEWC5Kay1OIHnTQj0JN6BnRfkmwWX?=
 =?Windows-1252?Q?93hcQMuROjPx4R1wll5BwNQb5zr8O803Nk6iOHRq4DIfYAl+530M8Hpp?=
 =?Windows-1252?Q?ksFsowjruNpAQ2zmyeodoSyd7N2koiwupjsn/DkVcjylE965dik6pJEE?=
 =?Windows-1252?Q?sES/g6MRkGzmPvRLZrEVAB2jkViJV2h8Dq1U3wp8OgMV97UXs/9m4El4?=
 =?Windows-1252?Q?xXABA2g2tn+uYB1FXq+zquuOrda9eVY6KSEYdzFJ2U4oWkIJeMrS8Rwc?=
 =?Windows-1252?Q?7mprC2e8zJvvhRQvTScAIhDGW7SIJRIfWzBupaQ3HWYm6FcwcZEog2bC?=
 =?Windows-1252?Q?jS18NBTZBs9ft1qSZ3XSqej81j5mxvsG9OPds1GhgH0W18whwS3hIH5h?=
 =?Windows-1252?Q?Cvo0l/6Xcd5IvF760Ot5VD9E41S0LmQFVxi0FySKHC8zfmS4fzpQSnfI?=
 =?Windows-1252?Q?ZXlLf+sfAxkBmCncmSUyHHs5wCL+ooXsIJZboecgfA9jMY7dkFZQE+fB?=
 =?Windows-1252?Q?N0D5+ztQVbzn387oC7Fllyn3jfhHJwsUoN8BRXQ+aiiqOKTF/EJKuoEz?=
 =?Windows-1252?Q?ZVB5qgxTk4qRBoj1Nrx/eml7i/ipgeuNLG6ovNjUsPPu+eOrUovIGkT8?=
 =?Windows-1252?Q?2M22NAz+QrLA3MWUpMGAfC2gCxB/o9FFa5GrQMMYOcYrIwEUnjVfdYAl?=
 =?Windows-1252?Q?6D+BPSJkTUSEWowWx+H93Smqa1VIeoS4GzB16PHqP2fuQnVHDuvJP3lt?=
 =?Windows-1252?Q?8f0z9bFNRmofdqtn?=
X-OriginatorOrg: cornell.edu
X-MS-Exchange-CrossTenant-AuthSource: MN2PR04MB6176.namprd04.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Dec 2020 22:56:11.0650 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 5d7e4366-1b9b-45cf-8e79-b14b27df46e1
X-MS-Exchange-CrossTenant-Network-Message-Id: fa0cbbfa-676d-4184-f6e5-08d8a85f1b99
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: CDjIsIStdIOOKovqDb6yCyx5vg9NdSli4L6t/C2jV7oq5zApvFbUmXRJ846q4qckwyWfT7J1iLemxjLmEGTlUw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB5632
X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00, BODY_8BITS,
 DKIM_INVALID, DKIM_SIGNED, KAM_DMARC_STATUS, MSGID_FROM_MTA_HEADER,
 NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS,
 TXREP autolearn=no autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Ken Brown <kbrown AT cornell DOT edu>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Errors-To: cygwin-bounces AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces AT cygwin DOT com>
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id 0BOMuiMv020418

On 12/24/2020 4:13 PM, Kaz Kylheku (Cygwin) via Cygwin wrote:
> On 2020-10-10 09:32, Kaz Kylheku (Cygwin) via Cygwin wrote:
>> Hi all,
>>
>> Running this Cygwin on a Windows 10 system:
>>
>>   0:DESKTOP-K8055OB:~$ uname -a
>>   CYGWIN_NT-10.0-WOW DESKTOP-K8055OB 3.1.7(0.340/5/3) 2020-08-22 19:03
>> i686 Cygwi
>>
>> When a file is created, and permissions set as follows:
>>
>>   0:DESKTOP-K8055OB:~$ touch tempfile
>>   0:DESKTOP-K8055OB:~$ chmod 03777 tempfile
>>   0:DESKTOP-K8055OB:~$ ls -l tempfile
>>   -rwsrwsrwt 1 kaz kaz 0 Oct 10 08:59 tempfile
>>
>> Then "chmod u=" is not able to clear the owner's permissions to nothing:
>>
>>   0:DESKTOP-K8055OB:~$ chmod u= tempfile
>>   0:DESKTOP-K8055OB:~$ ls -l tempfile
>>   -rwxrwsrwt 1 kaz kaz 0 Oct 10 08:59 tempfile
>>
>> As you can see, it has no effect. The expected value is ----rwsrwt.
>>
>> I tried both with 64 and 32 bit Cygwin: same deal.
>>
>> This is not a problem with the chmod utility.  I ran into this as a failing
>> test case against a chmod library function in a programming language.
>>
>> http://www.kylheku.com/cgit/txr/tree/tests/018/chmod.tl
>>
>> The test cases pass until the "u=", which fails in the same way.
>> This does not use the chmod utility.
>>
>> It's an issue with the chmod system call.
>>
>> This used to work on my older Cygwin installation, which was around 2.5.
> 
> Anyone have a clue about this issue?
> 
> $ icacls tempfile
> tempfile NULL SID:(DENY)(Rc,S,RD,WD)
>           BLACKBOX\kaz:(F)
>           BLACKBOX\kaz:(RX,W)
>           Everyone:(RX,W)
> 
> $ getfacl tempfile
> # file: tempfile
> # owner: kaz
> # group: kaz
> # flags: -st
> user::rwx
> group::rwx
> other::rwx
> 
> $ ls -l tempfile
> -rwxrwsrwt 1 kaz kaz 0 Dec 24 13:09 tempfile
> 
> $ chmod u= tempfile
> $ ls -l tempfile
> -rwxrwsrwt 1 kaz kaz 0 Dec 24 13:09 tempfile

Could the problem be that the owner and group are the same?  You can do that on 
unix, but I'm not sure the Windows security model allows it.  For example, what 
happens when you remove permissions of the owner kaz while retaining the 
permissions of the group kaz?  As far as Windows is concerned, you're talking 
about BLACKBOX\kaz in both cases, I think.

Ken
--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple