netdev - Re: [PATCH bpf-next v2 1/2] bpf,ktls: Fix data corruption when using bpf_msg_pop

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Message-ID: <20250609123358.4e024e62@kernel.org>
Date: Mon, 9 Jun 2025 12:33:58 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jiayuan Chen <jiayuan.chen@...ux.dev>
Cc: bpf@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>, John
 Fastabend <john.fastabend@...il.com>, Boris Pismenny <borisp@...dia.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Eduard Zingerman
 <eddyz87@...il.com>, Mykola Lysenko <mykolal@...com>, Alexei Starovoitov
 <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, Yonghong Song
 <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, Ihor Solodrai
 <isolodrai@...a.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 1/2] bpf,ktls: Fix data corruption when
 using bpf_msg_pop_data() in ktls

On Mon,  9 Jun 2025 10:08:52 +0800 Jiayuan Chen wrote:
> When sending plaintext data, we initially calculated the corresponding
> ciphertext length. However, if we later reduced the plaintext data length
> via socket policy, we failed to recalculate the ciphertext length.
> 
> This results in transmitting buffers containing uninitialized data during
> ciphertext transmission.
> 
> This causes uninitialized bytes to be appended after a complete
> "Application Data" packet, leading to errors on the receiving end when
> parsing TLS record.

Acked-by: Jakub Kicinski <kuba@...nel.org>