From: Niklas Cassel niklas.cassel@wdc.com

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@wdc.com Reviewed-by: Damien Le Moal damien.lemoal@wdc.com Cc: stable@vger.kernel.org # v4.10+ --- Changes since v1: - Pick up tag from Damien. - Add fixes tag and CC stable.

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;