[RFC PATCH] nvme: allow specific passthrough IOs without CAP_SYSADMIN

[Christoph Hellwig]

On Sun, Oct 03, 2021 at 12:29:22PM +0300, Sagi Grimberg wrote:
>> Users that want to send any of these passthrough commands will still
>> require access to the NVMe char device or namespace. Typically, the
>> char device is only accessible by root anyway and namespaces are
>> accessible by root and the disk group. Administrators are free to
>> add udev rules to adjust these permissions for specific devices they
>> want to allow.
>
> I don't understand what is the difference between VS commands and normal
> commands? Why do you consider VS commands safe to relax privileges as
> opposed to any other command?

They are different in that it is cometely undefine what they do.
So relaxing that checks is an absolute non-starter while for simple
things like Read it might be possible if we really care.