Re: [PATCH v4 4/4] vduse: Add LSM hooks to check Virtio device type

[Maxime Coquelin]

On 10/21/23 00:20, Casey Schaufler wrote:
> On 10/20/2023 8:58 AM, Maxime Coquelin wrote:
> > This patch introduces LSM hooks for devices creation,
> > destruction and opening operations, checking the
> > application is allowed to perform these operations for
> > the Virtio device type.
>
> Why do you think that there needs to be a special LSM check for virtio
> devices? What can't existing device attributes be used?

Michael asked for a way for SELinux to allow/prevent the creation of
some types of devices [0].

A device is created using ioctl() on VDUSE control chardev. Its type is
specified via a field in the structure passed in argument.

I didn't see other way than adding dedicated LSM hooks to achieve this,
but it is possible that their is a better way to do it?

Thanks,
Maxime

[0]: 
https://lore.kernel.org/all/20230829130430-mutt-send-email-mst@xxxxxxxxxx/