From: Martin KaFai Lau <martin.lau@linux.dev>
To: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: bpf@vger.kernel.org, Kuniyuki Iwashima <kuniyu@google.com>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Shuah Khan <shuah@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf v5 1/2] bpf: tcp: Reject non-TCP skb in bpf_sk_assign_tcp_reqsk()
Date: Wed, 1 Apr 2026 22:47:10 -0700 [thread overview]
Message-ID: <ac3_SCbLAwVOFKDC@devbig1721.ftw5.facebook.com> (raw)
In-Reply-To: <20260401110511.73355-2-jiayuan.chen@linux.dev>
On Wed, Apr 01, 2026 at 07:04:49PM +0800, Jiayuan Chen wrote:
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 78b548158fb0..f251744025e2 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -12248,11 +12248,23 @@ __bpf_kfunc int bpf_sk_assign_tcp_reqsk(struct __sk_buff *s, struct sock *sk,
>
> switch (skb->protocol) {
> case htons(ETH_P_IP):
> + if (!pskb_may_pull(skb, sizeof(struct iphdr)))
The ai-review [1] is correct. skb_header_pointer() should be used.
pskb_may_pull() could invalidate the skb->data[_end] pointers
in the bpf prog.
[1]: https://sashiko.dev/#/patchset/20260401110511.73355-1-jiayuan.chen%40linux.dev
It needs one more spin. Thanks.
pw-bot: cr
next prev parent reply other threads:[~2026-04-02 5:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-01 11:04 [PATCH bpf v5 0/2] bpf: tcp: Fix null-ptr-deref in arbitrary SYN Cookie Jiayuan Chen
2026-04-01 11:04 ` [PATCH bpf v5 1/2] bpf: tcp: Reject non-TCP skb in bpf_sk_assign_tcp_reqsk() Jiayuan Chen
2026-04-02 5:47 ` Martin KaFai Lau [this message]
2026-04-01 11:04 ` [PATCH bpf v5 2/2] selftests/bpf: Add protocol check test for bpf_sk_assign_tcp_reqsk() Jiayuan Chen
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