From: patchwork-bot+netdevbpf@kernel.org
To: Weiming Shi <bestswngs@gmail.com>
Cc: daniel@iogearbox.net, john.fastabend@gmail.com, sdf@fomichev.me,
martin.lau@linux.dev, ast@kernel.org, andrii@kernel.org,
eddyz87@gmail.com, memxor@gmail.com, song@kernel.org,
yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com,
ihor.solodrai@linux.dev, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
horms@kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, dlebrun@google.com,
m.xhonneux@gmail.com, co+adfca3e91be95776@bugs.sh, xmei5@asu.edu,
alexei.starovoitov@gmail.com, stable@vger.kernel.org
Subject: Re: [PATCH bpf v2] bpf: disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
Date: Wed, 09 Sep 2026 18:40:03 +0000 [thread overview]
Message-ID: <178897920389.1001427.18181252445473114035.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260909040807.3885815-2-bestswngs@gmail.com>
Hello:
This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:
On Wed, 9 Sep 2026 12:08:08 +0800 you wrote:
> An LWT_SEG6LOCAL program can invalidate its cached SRH with
> bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter
> may reallocate skb->head, leaving the per-CPU SRH pointer dangling.
> Post-program SRH validation then writes through that pointer.
>
> Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier
> rejects this unsafe helper combination. Other LWT program types continue
> to expose the helper through lwt_out_func_proto().
>
> [...]
Here is the summary with links:
- [bpf,v2] bpf: disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
https://git.kernel.org/bpf/bpf/c/e4a62833adff
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
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prev parent reply other threads:[~2026-09-09 18:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 19:21 [PATCH bpf] bpf: refresh seg6local SRH pointer after skb pull Weiming Shi
2026-09-07 19:44 ` sashiko-bot
2026-09-07 20:02 ` Alexei Starovoitov
2026-09-08 15:35 ` Weiming Shi
2026-09-09 4:08 ` [PATCH bpf v2] bpf: disallow bpf_skb_pull_data() for LWT_SEG6LOCAL Weiming Shi
2026-09-09 4:27 ` sashiko-bot
2026-09-09 18:18 ` Emil Tsalapatis
2026-09-09 18:40 ` patchwork-bot+netdevbpf [this message]
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