netdev - Re: [PATCH bpf 1/2] bpf, x32: Fix invalid instruction in BPF

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Message-ID: <CAKU6vyaHcGmgznkDav1wpkB3MiSYM9G2pqmc6DELXwUyNpHwyQ@mail.gmail.com>
Date:   Wed, 22 Apr 2020 00:22:16 -0700
From:   Xi Wang <xi.wang@...il.com>
To:     hpa@...or.com
Cc:     Luke Nelson <lukenels@...washington.edu>, bpf@...r.kernel.org,
        Luke Nelson <luke.r.nels@...il.com>,
        Wang YanQing <udknight@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf 1/2] bpf, x32: Fix invalid instruction in BPF_LDX zero-extension

On Wed, Apr 22, 2020 at 12:13 AM <hpa@...or.com> wrote:
> C7 C0 0 is *not* an invalid instruction, although it is incomplete. It is a different, but arguably even more serious, problem.

Yep, it would "eat" three bytes coming after that. :)