netdev - Re: [PATCH net] genetlink: reject use of nlmsg

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Message-ID: <20220929092055.GA3651@localhost.localdomain>
Date:   Thu, 29 Sep 2022 11:20:55 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, Florent Fourcot <florent.fourcot@...irst.fr>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Johannes Berg <johannes@...solutions.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [PATCH net] genetlink: reject use of nlmsg_flags for new commands

On Wed, Sep 28, 2022 at 11:35:15AM -0700, Jakub Kicinski wrote:
> Commit 9c5d03d36251 ("genetlink: start to validate reserved header bytes")
> introduced extra validation for genetlink headers. We had to gate it
> to only apply to new commands, to maintain bug-wards compatibility.
> Use this opportunity (before the new checks make it to Linus's tree)
> to add more conditions.
> 
> Validate that Generic Netlink families do not use nlmsg_flags outside
> of the well-understood set.

Reviewed-by: Guillaume Nault <gnault@...hat.com>