netdev - Re: netlink: 16 bytes leftover after parsing attributes in process `ip'.

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Message-ID: <20180926075115.4ca7c527@redhat.com>
Date:   Wed, 26 Sep 2018 07:51:15 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Christian Brauner <christian@...uner.io>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: netlink: 16 bytes leftover after parsing attributes in process
 `ip'.

On Tue, 25 Sep 2018 09:37:41 -0600, David Ahern wrote:
> For ifaddrmsg ifa_flags aligns with ifi_type which is set by kernel side
> so this should be ok.

Does the existing user space set ifi_type to anything? Does it zero out
the field?

Are we able to find a flag value that is not going to be set by unaware
user space? I.e., a bit that is unused by the current ARPHRD values on
both little and big endian? (ARPHRD_NONE might be a problem, though...)

 Jiri