netdev - Re: [PATCH net-next v6 09/19] net: psp: update the TCP MSS to reflect PSP packet overhead

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Message-ID: <a6635ce0-a27f-4a3b-845a-7c25f8b58452@redhat.com>
Date: Thu, 14 Aug 2025 15:58:19 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Daniel Zahka <daniel.zahka@...il.com>,
 Donald Hunter <donald.hunter@...il.com>, Jakub Kicinski <kuba@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Simon Horman <horms@...nel.org>, Jonathan Corbet <corbet@....net>,
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 Tariq Toukan <tariqt@...dia.com>, Boris Pismenny <borisp@...dia.com>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, David Ahern <dsahern@...nel.org>,
 Neal Cardwell <ncardwell@...gle.com>, Patrisious Haddad
 <phaddad@...dia.com>, Raed Salem <raeds@...dia.com>,
 Jianbo Liu <jianbol@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>,
 Rahul Rameshbabu <rrameshbabu@...dia.com>,
 Stanislav Fomichev <sdf@...ichev.me>,
 Toke Høiland-Jørgensen <toke@...hat.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Kiran Kella <kiran.kella@...adcom.com>,
 Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 09/19] net: psp: update the TCP MSS to reflect
 PSP packet overhead

On 8/12/25 2:29 AM, Daniel Zahka wrote:
> @@ -236,6 +237,10 @@ int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,
>  	tcp_write_collapse_fence(sk);
>  	pas->upgrade_seq = tcp_sk(sk)->rcv_nxt;
>  
> +	icsk = inet_csk(sk);
> +	icsk->icsk_ext_hdr_len += psp_sk_overhead(sk);

I'm likely lost, but AFAICS the user-space can successfully call
multiple times psp_sock_assoc_set_tx() on the same socket, increasing
icsk->icsk_ext_hdr_len in an unbounded way.

/P