linux-hardening - Re: [PATCH] netfilter: conntrack: Use memset_startat() to zero struct nf

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Message-ID: <Yaacdlj7UX1StO5Y@salvia>
Date:   Tue, 30 Nov 2021 22:49:42 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] netfilter: conntrack: Use memset_startat() to zero
 struct nf_conn

On Thu, Nov 18, 2021 at 12:31:13PM -0800, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memset(), avoid intentionally writing across
> neighboring fields.
> 
> Use memset_startat() to avoid confusing memset() about writing beyond
> the target struct member.

Applied to nf-next, thanks