linux-kernel - Re: [PATCH HID for-next v3 3/5] HID: bpf: enforce HID

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Message-ID: <CAO-hwJJq23V+ceJvX8zz-wGB6VgByuMY-xGu8VukiOmP+FfXHA@mail.gmail.com>
Date:   Wed, 7 Dec 2022 15:58:21 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Florent Revest <revest@...omium.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH HID for-next v3 3/5] HID: bpf: enforce HID_BPF dependencies

On Tue, Dec 6, 2022 at 3:59 PM Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
>
> As mentioned in the link below, having JIT and BPF is not enough to
> have fentry/fexit/fmod_ret APIs. This resolves the error that
> happens on a system without tracing enabled when hid-bpf tries to
> load itself.
>
> Link: https://lore.kernel.org/r/CABRcYmKyRchQhabi1Vd9RcMQFCcb=EtWyEbFDFRTc-L-U8WhgA@mail.gmail.com
> Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>
> ---
>
> no changes in v3
>
> changes in v2:
> - dropped ALLOW_ERROR_INJECTION requirement

Florent, can I keep your reviewed-by on this patch?

Jon, may I ask you to do one more testing with the full v3 applied on
top of for-next?

Cheers,
Benjamin

> ---
>  drivers/hid/bpf/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
> index 298634fc3335..03f52145b83b 100644
> --- a/drivers/hid/bpf/Kconfig
> +++ b/drivers/hid/bpf/Kconfig
> @@ -4,7 +4,8 @@ menu "HID-BPF support"
>  config HID_BPF
>         bool "HID-BPF support"
>         default HID_SUPPORT
> -       depends on BPF && BPF_SYSCALL
> +       depends on BPF && BPF_SYSCALL && \
> +                  DYNAMIC_FTRACE_WITH_DIRECT_CALLS
>         help
>         This option allows to support eBPF programs on the HID subsystem.
>         eBPF programs can fix HID devices in a lighter way than a full
> --
> 2.38.1
>