Re: [RFC v2 2/2] netlink: add ethernet address policy types

[Arend van Spriel <arend.vanspriel@broadcom.com>]

On 9/12/2018 10:36 AM, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg@intel.com>
>
> Commonly, ethernet addresses are just using a policy of
> 	{ .len = ETH_ALEN }
> which leaves userspace free to send more data than it should,
> which may hide bugs.
>
> Introduce NLA_ETH_ADDR which checks for exact size, and rejects
> the attribute if the length isn't ETH_ALEN.
>
> Also add NLA_ETH_ADDR_COMPAT which can be used in place of the
> policy above, but will, in addition, warn on an address that's
> too long.

Not sure if this is correctly described here. It seems longer addresses 
are not rejected, but only result in a warning message. I guess the 
problem is in the reference to the "policy above" ;-)

Regards,
Arend