netdev - Re: [PATCH net] mptcp: prevent BPF accessing lowat from a subflow socket.

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Message-Id: 
 <171203162704.30104.6455806082804107632.git-patchwork-notify@kernel.org>
Date: Tue, 02 Apr 2024 04:20:27 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, matttbe@...nel.org, martineau@...nel.org,
 geliang@...nel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, mptcp@...ts.linux.dev, bpf@...r.kernel.org
Subject: Re: [PATCH net] mptcp: prevent BPF accessing lowat from a subflow socket.

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Fri, 29 Mar 2024 19:50:36 +0100 you wrote:
> Alexei reported the following splat:
> 
>  WARNING: CPU: 32 PID: 3276 at net/mptcp/subflow.c:1430 subflow_data_ready+0x147/0x1c0
>  Modules linked in: dummy bpf_testmod(O) [last unloaded: bpf_test_no_cfi(O)]
>  CPU: 32 PID: 3276 Comm: test_progs Tainted: GO       6.8.0-12873-g2c43c33bfd23
>  Call Trace:
>   <TASK>
>   mptcp_set_rcvlowat+0x79/0x1d0
>   sk_setsockopt+0x6c0/0x1540
>   __bpf_setsockopt+0x6f/0x90
>   bpf_sock_ops_setsockopt+0x3c/0x90
>   bpf_prog_509ce5db2c7f9981_bpf_test_sockopt_int+0xb4/0x11b
>   bpf_prog_dce07e362d941d2b_bpf_test_socket_sockopt+0x12b/0x132
>   bpf_prog_348c9b5faaf10092_skops_sockopt+0x954/0xe86
>   __cgroup_bpf_run_filter_sock_ops+0xbc/0x250
>   tcp_connect+0x879/0x1160
>   tcp_v6_connect+0x50c/0x870
>   mptcp_connect+0x129/0x280
>   __inet_stream_connect+0xce/0x370
>   inet_stream_connect+0x36/0x50
>   bpf_trampoline_6442491565+0x49/0xef
>   inet_stream_connect+0x5/0x50
>   __sys_connect+0x63/0x90
>   __x64_sys_connect+0x14/0x20
> 
> [...]

Here is the summary with links:
  - [net] mptcp: prevent BPF accessing lowat from a subflow socket.
    https://git.kernel.org/netdev/net/c/fcf4692fa39e

You are awesome, thank you!
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