linux-block.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Himanshu Madhani <himanshu.madhani@oracle.com>
To: Niklas Cassel <Niklas.Cassel@wdc.com>,
	Jens Axboe <axboe@kernel.dk>, Hannes Reinecke <hare@suse.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Damien Le Moal <Damien.LeMoal@wdc.com>,
	Shaun Tancheff <shaun@tancheff.com>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>,
	Jens Axboe <axboe@fb.com>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN
Date: Fri, 18 Jun 2021 12:57:08 -0500	[thread overview]
Message-ID: <07d2d0ab-0dbe-3ef1-b127-c7a9eee43612@oracle.com> (raw)
In-Reply-To: <20210614122303.154378-3-Niklas.Cassel@wdc.com>



On 6/14/21 7:23 AM, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@wdc.com>
> 
> 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 <niklas.cassel@wdc.com>
> 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_READ
> check on BLKREPORTZONE would break existing applications. Instead, just remove
> the existing CAP_SYS_ADMIN check.
> 
>   block/blk-zoned.c | 3 ---
>   1 file changed, 3 deletions(-)
> 
> 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 *bdev, fmode_t mode,
>   	if (!blk_queue_is_zoned(q))
>   		return -ENOTTY;
>   
> -	if (!capable(CAP_SYS_ADMIN))
> -		return -EACCES;
> -
>   	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
>   		return -EFAULT;
>   
> 

Looks Good.

Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
-- 
Himanshu Madhani                                Oracle Linux Engineering

  parent reply	other threads:[~2021-06-18 17:57 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 12:23 [PATCH v3 0/2] allow blk-zoned ioctls " Niklas Cassel
2021-06-14 12:23 ` [PATCH v3 1/2] blk-zoned: allow zone management send operations " Niklas Cassel
2021-06-16 13:42   ` Aravind Ramesh
2021-06-18 14:48   ` Adam Manzanares
2021-06-18 17:56   ` Himanshu Madhani
2021-06-14 12:23 ` [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE " Niklas Cassel
2021-06-16  2:29   ` Damien Le Moal
2021-06-16 13:43   ` Aravind Ramesh
2021-06-18 14:49   ` Adam Manzanares
2021-06-18 17:57   ` Himanshu Madhani [this message]
2021-06-28  7:20 ` [PATCH v3 0/2] allow blk-zoned ioctls " Niklas Cassel
2021-07-05 11:26   ` Niklas Cassel
2021-07-21  5:04     ` Aravind Ramesh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=07d2d0ab-0dbe-3ef1-b127-c7a9eee43612@oracle.com \
    --to=himanshu.madhani@oracle.com \
    --cc=Damien.LeMoal@wdc.com \
    --cc=Niklas.Cassel@wdc.com \
    --cc=axboe@fb.com \
    --cc=axboe@kernel.dk \
    --cc=hare@suse.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    --cc=shaun@tancheff.com \
    --cc=stable@vger.kernel.org \
    --subject='Re: [PATCH v3 2/2] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).