[PATCHv2] nvme: restrict management ioctls to admin

[Keith Busch <kbusch@fb.com>]

From: Keith Busch <kbusch@kernel.org>

The passthrough commands already have this restriction, but the other
operations do not. Require the same capabilities for all users as all of
these operations, which include resets and rescans, can be disruptive.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
v1->v2:
  Check the user's capability in each case individually.

 drivers/nvme/host/ioctl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index d3281f87cd6e..a48a79ed5c4c 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -764,11 +764,17 @@ long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 	case NVME_IOCTL_IO_CMD:
 		return nvme_dev_user_cmd(ctrl, argp);
 	case NVME_IOCTL_RESET:
+		if (!capable(CAP_SYS_ADMIN))
+			return -EACCES;
 		dev_warn(ctrl->device, "resetting controller\n");
 		return nvme_reset_ctrl_sync(ctrl);
 	case NVME_IOCTL_SUBSYS_RESET:
+		if (!capable(CAP_SYS_ADMIN))
+			return -EACCES;
 		return nvme_reset_subsystem(ctrl);
 	case NVME_IOCTL_RESCAN:
+		if (!capable(CAP_SYS_ADMIN))
+			return -EACCES;
 		nvme_queue_scan(ctrl);
 		return 0;
 	default:
-- 
2.30.2