[PATCH 4/4] nvme: reject passthrough of queue creation / deletion commands

[Christoph Hellwig <hch@lst.de>]

Creating and deleting queues interferes directly with the low-level
operation of the driver.  Don't allow user space processes to do that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/ioctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 171c983191501..271f85ee04e9b 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -34,6 +34,14 @@ static int nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
 				return -EINVAL;
 			}
 			break;
+		case nvme_admin_create_cq:
+		case nvme_admin_create_sq:
+		case nvme_admin_delete_cq:
+		case nvme_admin_delete_sq:
+			dev_warn_ratelimited(ns->ctrl->device,
+				"rejecting queue create/delete command (0x%x) by %s\n",
+				c->common.opcode, current->comm);
+			return -EINVAL;
 		}
 	}
 
-- 
2.30.2