linux-kernel - Re: [PATCH bpf-next v9 3/3] bpf, selftest: Add tests for FIONREAD and copied

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Message-ID: <87v7goskpr.fsf@cloudflare.com>
Date: Mon, 26 Jan 2026 11:59:44 +0100
From: Jakub Sitnicki <jakub@...udflare.com>
To: Jiayuan Chen <jiayuan.chen@...ux.dev>
Cc: bpf@...r.kernel.org,  John Fastabend <john.fastabend@...il.com>,  "David
 S. Miller" <davem@...emloft.net>,  Eric Dumazet <edumazet@...gle.com>,
  Jakub Kicinski <kuba@...nel.org>,  Paolo Abeni <pabeni@...hat.com>,
  Simon Horman <horms@...nel.org>,  Neal Cardwell <ncardwell@...gle.com>,
  Kuniyuki Iwashima <kuniyu@...gle.com>,  David Ahern <dsahern@...nel.org>,
  Alexei Starovoitov <ast@...nel.org>,  Daniel Borkmann
 <daniel@...earbox.net>,  Andrii Nakryiko <andrii@...nel.org>,  Martin
 KaFai Lau <martin.lau@...ux.dev>,  Eduard Zingerman <eddyz87@...il.com>,
  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>,  Michal Luczaj <mhal@...x.co>,  Cong Wang
 <cong.wang@...edance.com>,  netdev@...r.kernel.org,
  linux-kernel@...r.kernel.org,  linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v9 3/3] bpf, selftest: Add tests for FIONREAD
 and copied_seq

On Sat, Jan 24, 2026 at 07:32 PM +08, Jiayuan Chen wrote:
> This commit adds two new test functions: one to reproduce the bug reported
> by syzkaller [1], and another to cover the calculation of copied_seq.
>
> The tests primarily involve installing  and uninstalling sockmap on
> sockets, then reading data to verify proper functionality.
>
> Additionally, extend the do_test_sockmap_skb_verdict_fionread() function
> to support UDP FIONREAD testing.
>
> [1] https://syzkaller.appspot.com/bug?extid=06dbd397158ec0ea4983
>
> Signed-off-by: Jiayuan Chen <jiayuan.chen@...ux.dev>
> ---

Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>