linux-kernel - Re: [PATCH bpf-next v1 1/2] bpf,ktls: Fix data corruption when using bpf_msg_pop

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Message-ID: <20250528215945.wtfadyr7lvzyqzzc@gmail.com>
Date: Wed, 28 May 2025 14:59:45 -0700
From: John Fastabend <john.fastabend@...il.com>
To: Jiayuan Chen <jiayuan.chen@...ux.dev>
Cc: bpf@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
	Boris Pismenny <borisp@...dia.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"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 v1 1/2] bpf,ktls: Fix data corruption when using
 bpf_msg_pop_data() in ktls

On 2025-05-23 21:18:58, 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.
> 
> Fixes: d3b18ad31f93 ("tls: add bpf support to sk_msg handling")
> Reported-by: Cong Wang <xiyou.wangcong@...il.com>
> Signed-off-by: Jiayuan Chen <jiayuan.chen@...ux.dev>
> ---

LGTM thanks.

Reviewed-by: John Fastabend <john.fastabend@...il.com>