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

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Date:   Tue, 21 Apr 2020 21:13:26 -0700
From:   Xi Wang <xi.wang@...il.com>
To:     Brian Gerst <brgerst@...il.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        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>,
        "the arch/x86 maintainers" <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 Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf 1/2] bpf, x32: Fix invalid instruction in BPF_LDX zero-extension

On Tue, Apr 21, 2020 at 8:22 PM Brian Gerst <brgerst@...il.com> wrote:
> You should explain the reason it is invalid, ie. the instruction
> encoding needs a 32-bit immediate but the current code only emits an
> 8-bit immediate.

Thanks!  Will do in v2.