linux-kernel - Re: [PATCH v4,bpf-next] bpf: Don't redirect packets with invalid pkt

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Date:   Wed, 14 Sep 2022 11:19:36 +0000
From:   Lorenz Bauer <oss@....io>
To:     shaozhengchao@...wei.com, ast@...nel.org, daniel@...earbox.net
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org, sdf@...gle.com,
        yuehaibing@...wei.com, Lorenz Bauer <oss@....io>
Subject: Re: [PATCH v4,bpf-next] bpf: Don't redirect packets with invalid pkt_len

Hi,

I think this patch is causing user-space breakage, see [0].

The gist is that we do BPF_PROG_RUN of a socket filter with 14 byte input to determine whether
BPF_PROG_RUN is available or not. I'll fix this in cilium/ebpf, but I think this patch
needs more work since users may be doing the same thing in their code.

Thanks,
Lorenz

0: https://github.com/cilium/ebpf/pull/788