Re: [PATCH 05/17] nvme: wire-up support for async-passthru on char-device.

[Luis Chamberlain <mcgrof@kernel.org>]

On Tue, Mar 08, 2022 at 08:50:53PM +0530, Kanchan Joshi wrote:
> diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
> index 5c9cd9695519..1df270b47af5 100644
> --- a/drivers/nvme/host/ioctl.c
> +++ b/drivers/nvme/host/ioctl.c
> @@ -369,6 +469,33 @@ long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  	return __nvme_ioctl(ns, cmd, (void __user *)arg);
>  }
>  
> +static int nvme_ns_async_ioctl(struct nvme_ns *ns, struct io_uring_cmd *ioucmd)
> +{
> +	int ret;
> +
> +	BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
> +
> +	switch (ioucmd->cmd_op) {
> +	case NVME_IOCTL_IO64_CMD:
> +		ret = nvme_user_cmd64(ns->ctrl, ns, NULL, ioucmd);
> +		break;
> +	default:
> +		ret = -ENOTTY;
> +	}
> +
> +	if (ret >= 0)
> +		ret = -EIOCBQUEUED;
> +	return ret;
> +}

And here I think we'll need something like this:

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index ddb7e5864be6..83529adf130d 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -5,6 +5,7 @@
  */
 #include <linux/ptrace.h>	/* for force_successful_syscall_return */
 #include <linux/nvme_ioctl.h>
+#include <linux/security.h>
 #include "nvme.h"
 
 /*
@@ -524,6 +525,11 @@ static int nvme_ns_async_ioctl(struct nvme_ns *ns, struct io_uring_cmd *ioucmd)
 
 	BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
 
+	ret = security_file_ioctl(ioucmd->file, ioucmd->cmd_op,
+				  (unsigned long) ioucmd->cmd);
+	if (ret)
+		return ret;
+
 	switch (ioucmd->cmd_op) {
 	case NVME_IOCTL_IO64_CMD:
 		ret = nvme_user_cmd64(ns->ctrl, ns, NULL, ioucmd);