linux-kernel - Re: [PATCH nf] netfilter/xt_u32: validate user space input

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Date:   Wed, 30 Aug 2023 17:18:05 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Wander Lairson Costa <wander@...hat.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Patrick McHardy <kaber@...sh.net>,
        Jan Engelhardt <jengelh@....de>,
        "open list:NETFILTER" <netfilter-devel@...r.kernel.org>,
        "open list:NETFILTER" <coreteam@...filter.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH nf] netfilter/xt_u32: validate user space input

On Mon, Aug 28, 2023 at 10:21:07AM -0300, Wander Lairson Costa wrote:
> The xt_u32 module doesn't validate the fields in the xt_u32 structure.
> An attacker may take advantage of this to trigger an OOB read by setting
> the size fields with a value beyond the arrays boundaries.
> 
> Add a checkentry function to validate the structure.
> 
> This was originally reported by the ZDI project (ZDI-CAN-18408).

Applied to nf, thanks