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ublk: santizize the arguments from userspace when adding a device

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[ Upstream commit 8c8472855884355caf3d8e0c50adf825f83454b2 ]

Sanity check the values for queue depth and number of queues
we get from userspace when adding a device.

Signed-off-by: Ronnie Sahlberg <rsahlberg@whamcloud.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Fixes: 71f28f3136 ("ublk_drv: add io_uring based userspace block driver")
Fixes: 62fe99cef9 ("ublk: add read()/write() support for ublk char device")
Link: https://lore.kernel.org/r/20250619021031.181340-1-ronniesahlberg@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ronnie Sahlberg
2025-06-19 12:10:31 +10:00
committed by Greg Kroah-Hartman
parent 66bba1fd5b
commit 3162d8235c
1 changed files with 3 additions and 0 deletions
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3
drivers/block/ublk_drv.c
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@@ -2323,6 +2323,9 @@ static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
if (copy_from_user(&info, argp, sizeof(info)))
return -EFAULT;
if (info.queue_depth > UBLK_MAX_QUEUE_DEPTH || info.nr_hw_queues > UBLK_MAX_NR_QUEUES)
return -EINVAL;
if (capable(CAP_SYS_ADMIN))
info.flags &= ~UBLK_F_UNPRIVILEGED_DEV;
else if (!(info.flags & UBLK_F_UNPRIVILEGED_DEV))