From 2edc06fa381a0117a6965c0a46912943f5278e05 Mon Sep 17 00:00:00 2001 From: Niklas Cassel Date: Wed, 11 Aug 2021 11:05:19 +0000 Subject: [PATCH] blk-zoned: allow BLKREPORTZONE without CAP_SYS_ADMIN commit 4d643b66089591b4769bcdb6fd1bfeff2fe301b8 upstream. 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 Reviewed-by: Johannes Thumshirn Cc: stable@vger.kernel.org # v4.10+ Link: https://lore.kernel.org/r/20210811110505.29649-3-Niklas.Cassel@wdc.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-zoned.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 0a760845691e..a85d0a06a6ff 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -316,9 +316,6 @@ 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;