linux-kernel - Re: [PATCH net-next v2 3/3] netlink: add validation of NLA_F

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Message-ID: <8e4ba571-de11-8448-c44c-cbc7024ab9a4@gmail.com>
Date:   Wed, 24 Jul 2019 19:46:22 -0700
From:   David Ahern <dsahern@...il.com>
To:     Thomas Haller <thaller@...hat.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Johannes Berg <johannes@...solutions.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 3/3] netlink: add validation of NLA_F_NESTED
 flag

On 7/23/19 1:57 AM, Thomas Haller wrote:
> Does this flag and strict validation really provide any value? Commonly a netlink message
> is a plain TLV blob, and the meaning depends entirely on the policy.

Strict checking enables kernel side filtering and other features that
require passing attributes as part of the dump request - like address
dumps in a specific namespace.