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Petersen" CC: Damien Le Moal , Niklas Cassel , Damien Le Moal , Aravind Ramesh , Adam Manzanares , Himanshu Madhani , "stable@vger.kernel.org" , Jens Axboe , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH v4 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Topic: [PATCH v4 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN Thread-Index: AQHXjQP4aNCn2fw5YUWhEgczWRLRaw== Date: Mon, 9 Aug 2021 09:50:21 +0000 Message-ID: <20210809094855.6226-3-Niklas.Cassel@wdc.com> References: <20210809094855.6226-1-Niklas.Cassel@wdc.com> In-Reply-To: <20210809094855.6226-1-Niklas.Cassel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.31.1 authentication-results: kernel.dk; dkim=none (message not signed) header.d=none;kernel.dk; dmarc=none action=none header.from=wdc.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 63dae971-40ef-43dd-58b7-08d95b1b1c01 x-ms-traffictypediagnostic: PH0PR04MB7558: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8273; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH0PR04MB7158.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 63dae971-40ef-43dd-58b7-08d95b1b1c01 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Aug 2021 09:50:21.6700 (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: pfw5d+xjd19gyHFSWcdG1Rg2pIRS1tgX/+9G6qSPPQf+Lzq3AogUPcoxk0wwysMoDsOTtj4sKzdrxAorCX3XlA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR04MB7558 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Niklas Cassel A user space process should not need the CAP_SYS_ADMIN capability set in order to perform a BLKREPORTZONE ioctl. 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 that a user space process that can read/write from/to the device, also can get the write pointer. (Since e.g. writes have to be at the write pointer.) Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls") Signed-off-by: Niklas Cassel Reviewed-by: Damien Le Moal Reviewed-by: Aravind Ramesh Reviewed-by: Adam Manzanares Reviewed-by: Himanshu Madhani Cc: stable@vger.kernel.org # v4.10+ --- Changes since v3: -Picked up additional Reviewed-by tags. block/blk-zoned.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 8a60dbeb44be..1d0c76c18fc5 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -360,9 +360,6 @@ int blkdev_report_zones_ioctl(struct block_device *bdev= , 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 --=20 2.31.1