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Petersen" , Damien Le Moal , Shaun Tancheff CC: Damien Le Moal , Niklas Cassel , "stable@vger.kernel.org" , Jens Axboe , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Topic: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Index: AQHXYRgoQPSf84k1AUaPPMUo9Yx7E6sWqOwg Date: Wed, 16 Jun 2021 13:43:39 +0000 Message-ID: References: <20210614122303.154378-1-Niklas.Cassel@wdc.com> <20210614122303.154378-3-Niklas.Cassel@wdc.com> In-Reply-To: <20210614122303.154378-3-Niklas.Cassel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: wdc.com; dkim=none (message not signed) header.d=none;wdc.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [87.116.37.42] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 60133fa9-ff83-4642-734d-08d930ccbfeb x-ms-traffictypediagnostic: BYAPR04MB6133: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR04MB4056.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 60133fa9-ff83-4642-734d-08d930ccbfeb X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Jun 2021 13:43:40.0066 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: vKHns7yR1HZFSlAUxAaJeS41IpxTYLT+Iy8K99egIc8iYhpl4b/g+h2TTyl+ZHW9V0aGtzC62LKa7VWjjktkGg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB6133 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Niklas Cassel > Sent: Monday, June 14, 2021 5:53 PM > To: Jens Axboe ; Hannes Reinecke ; Martin= K. > Petersen ; Damien Le Moal > ; Shaun Tancheff > Cc: Damien Le Moal ; Niklas Cassel > ; stable@vger.kernel.org; Jens Axboe ; > linux-block@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without > CAP_SYS_ADMIN >=20 > From: Niklas Cassel >=20 > A user space process should not need the CAP_SYS_ADMIN capability set in = order to > perform a BLKREPORTZONE ioctl. >=20 > Getting the zone report is required in order to get the write pointer. > Neither read() nor write() requires CAP_SYS_ADMIN, so it is reasonable th= at a user > space process that can read/write from/to the device, also can get the wr= ite pointer. > (Since e.g. writes have to be at the write > pointer.) >=20 > Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls") > Signed-off-by: Niklas Cassel > Cc: stable@vger.kernel.org # v4.10+ > --- > Changes since v2: > -Drop the FMODE_READ check. Right now it is possible to open() the device= with > O_WRONLY and get the zone report from that fd. Therefore adding a FMODE_R= EAD > check on BLKREPORTZONE would break existing applications. Instead, just r= emove > the existing CAP_SYS_ADMIN check. >=20 > block/blk-zoned.c | 3 --- > 1 file changed, 3 deletions(-) >=20 > diff --git a/block/blk-zoned.c b/block/blk-zoned.c index > 0789e6e9f7db..457eceabed2e 100644 > --- a/block/blk-zoned.c > +++ b/block/blk-zoned.c > @@ -288,9 +288,6 @@ int blkdev_report_zones_ioctl(struct block_device *bd= ev, > fmode_t mode, > if (!blk_queue_is_zoned(q)) > return -ENOTTY; >=20 > - if (!capable(CAP_SYS_ADMIN)) > - return -EACCES; > - > if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report))) > return -EFAULT; >=20 > -- > 2.31.1 Looks good, Reviewed-by: Aravind Ramesh From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,PDS_BAD_THREAD_QP_64,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62A5FC48BE6 for ; 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Wed, 16 Jun 2021 13:43:40 +0000 Received: from BYAPR04MB4056.namprd04.prod.outlook.com ([fe80::fc71:bcb6:e18d:6973]) by BYAPR04MB4056.namprd04.prod.outlook.com ([fe80::fc71:bcb6:e18d:6973%5]) with mapi id 15.20.4219.026; Wed, 16 Jun 2021 13:43:40 +0000 Content-Type: multipart/mixed; boundary="_000_BYAPR04MB40565D2E221DDAA74288577A8C0F9BYAPR04MB4056namp_" From: Aravind Ramesh To: Niklas Cassel , Jens Axboe , Hannes Reinecke , "Martin K. Petersen" , Damien Le Moal , Shaun Tancheff CC: Damien Le Moal , Niklas Cassel , "stable@vger.kernel.org" , Jens Axboe , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Topic: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Index: AQHXYRgoQPSf84k1AUaPPMUo9Yx7E6sWqOwg Date: Wed, 16 Jun 2021 13:43:39 +0000 Message-ID: References: <20210614122303.154378-1-Niklas.Cassel@wdc.com> <20210614122303.154378-3-Niklas.Cassel@wdc.com> In-Reply-To: <20210614122303.154378-3-Niklas.Cassel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: wdc.com; dkim=none (message not signed) header.d=none;wdc.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [87.116.37.42] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 60133fa9-ff83-4642-734d-08d930ccbfeb x-ms-traffictypediagnostic: BYAPR04MB6133: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable > -----Original Message----- > From: Niklas Cassel > Sent: Monday, June 14, 2021 5:53 PM > To: Jens Axboe ; Hannes Reinecke ; Martin= K. > Petersen ; Damien Le Moal > ; Shaun Tancheff > Cc: Damien Le Moal ; Niklas Cassel > ; stable@vger.kernel.org; Jens Axboe ; > linux-block@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without > CAP_SYS_ADMIN >=20 > From: Niklas Cassel >=20 > A user space process should not need the CAP_SYS_ADMIN capability set in = order to > perform a BLKREPORTZONE ioctl. >=20 > Getting the zone report is required in order to get the write pointer. > Neither read() nor write() requires CAP_SYS_ADMIN, so it is reasonable th= at a user > space process that can read/write from/to the device, also can get the wr= ite pointer. > (Since e.g. writes have to be at the write > pointer.) >=20 > Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls") > Signed-off-by: Niklas Cassel > Cc: stable@vger.kernel.org # v4.10+ > --- > Changes since v2: > -Drop the FMODE_READ check. Right now it is possible to open() the device= with > O_WRONLY and get the zone report from that fd. Therefore adding a FMODE_R= EAD > check on BLKREPORTZONE would break existing applications. Instead, just r= emove > the existing CAP_SYS_ADMIN check. >=20 > block/blk-zoned.c | 3 --- > 1 file changed, 3 deletions(-) >=20 > diff --git a/block/blk-zoned.c b/block/blk-zoned.c index > 0789e6e9f7db..457eceabed2e 100644 > --- a/block/blk-zoned.c > +++ b/block/blk-zoned.c > @@ -288,9 +288,6 @@ int blkdev_report_zones_ioctl(struct block_device *bd= ev, > fmode_t mode, > if (!blk_queue_is_zoned(q)) > return -ENOTTY; >=20 > - if (!capable(CAP_SYS_ADMIN)) > - return -EACCES; > - > if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report))) > return -EFAULT; >=20 > -- > 2.31.1 Looks good, Reviewed-by: Aravind Ramesh --_000_BYAPR04MB40565D2E221DDAA74288577A8C0F9BYAPR04MB4056namp_ Content-Disposition: attachment; filename="winmail.dat" Content-Transfer-Encoding: base64 Content-Type: application/ms-tnef; name="winmail.dat" eJ8+IuRIAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEJgAEAIQAAADM3MkY4ODBG RkE4NkQ3NEE5NTU1NzQwOUI5RkFFQTZCAFkHAQ2ABAACAAAAAgACAAEFgAMADgAAAOUHBgAQAA0A 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