linux-kernel - Re: [PATCH bpf-next v1 1/6] HID: initial BPF implementation

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Message-ID: <CAO-hwJL73en_7thxM6Xt-RC2kqp=D8oyWuU_EL60hCsFCYPrsg@mail.gmail.com>
Date:   Mon, 28 Feb 2022 18:30:19 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Greg KH <greg@...ah.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v1 1/6] HID: initial BPF implementation

On Thu, Feb 24, 2022 at 12:41 PM Greg KH <greg@...ah.com> wrote:
>
> On Thu, Feb 24, 2022 at 12:08:23PM +0100, Benjamin Tissoires wrote:
> > index 000000000000..243ac45a253f
> > --- /dev/null
> > +++ b/include/uapi/linux/bpf_hid.h
> > @@ -0,0 +1,39 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
> > +
> > +/*
> > + *  HID BPF public headers
> > + *
> > + *  Copyright (c) 2021 Benjamin Tissoires
> > + */
> > +
> > +#ifndef _UAPI__LINUX_BPF_HID_H__
> > +#define _UAPI__LINUX_BPF_HID_H__
> > +
> > +#include <linux/types.h>
> > +
> > +#define HID_BPF_MAX_BUFFER_SIZE              16384           /* 16kb */
> > +
> > +struct hid_device;
> > +
> > +enum hid_bpf_event {
> > +     HID_BPF_UNDEF = 0,
> > +     HID_BPF_DEVICE_EVENT,
> > +};
> > +
> > +/* type is HID_BPF_DEVICE_EVENT */
> > +struct hid_bpf_ctx_device_event {
> > +     __u8 data[HID_BPF_MAX_BUFFER_SIZE];
> > +     unsigned long size;
>
> That's not a valid type to cross the user/kernel boundry, shouldn't it
> be "__u64"?  But really, isn't __u32 enough here?

Fixed locally with a __u16 instead. Will be present in v2.

Cheers,
Benjamin