Re: [PATCH v3 1/2] blk-zoned: allow zone management send operations without CAP_SYS_ADMIN

[Himanshu Madhani]

On 6/14/21 7:23 AM, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@xxxxxxx>
>
> Zone management send operations (BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE
> and BLKFINISHZONE) should be allowed under the same permissions as write().
> (write() does not require CAP_SYS_ADMIN).
>
> Additionally, other ioctls like BLKSECDISCARD and BLKZEROOUT only check if
> the fd was successfully opened with FMODE_WRITE.
> (They do not require CAP_SYS_ADMIN).
>
> Currently, zone management send operations require both CAP_SYS_ADMIN
> and that the fd was successfully opened with FMODE_WRITE.
>
> Remove the CAP_SYS_ADMIN requirement, so that zone management send
> operations match the access control requirement of write(), BLKSECDISCARD
> and BLKZEROOUT.
>
> Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls")
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
> Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.10+
> ---
> Changes since v2:
> -None
>
> Note to backporter:
> Function was added as blkdev_reset_zones_ioctl() in v4.10.
> Function was renamed to blkdev_zone_mgmt_ioctl() in v5.5.
> The patch is valid both before and after the function rename.
>
>   block/blk-zoned.c | 3 ---
>   1 file changed, 3 deletions(-)
>
> diff --git a/block/blk-zoned.c b/block/blk-zoned.c
> index 250cb76ee615..0789e6e9f7db 100644
> --- a/block/blk-zoned.c
> +++ b/block/blk-zoned.c
> @@ -349,9 +349,6 @@ int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
>   	if (!blk_queue_is_zoned(q))
>   		return -ENOTTY;
>   
> -	if (!capable(CAP_SYS_ADMIN))
> -		return -EACCES;
> -
>   	if (!(mode & FMODE_WRITE))
>   		return -EBADF;
>   

Looks Good.

Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>

--
Himanshu Madhani                                Oracle Linux Engineering