linux-kernel - Re: [PATCH 1/2] HID: bpf: enforce HID

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Message-ID: <7df26319-f4ee-6dd1-a1b8-1caaf595528d@nvidia.com>
Date:   Thu, 1 Dec 2022 13:13:05 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Florent Revest <revest@...omium.org>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/2] HID: bpf: enforce HID_BPF dependencies


On 30/11/2022 10:10, Benjamin Tissoires wrote:
> As mentioned in the link below, having JIT and BPF is not enough to
> have fmod_ret and error injection 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>
> ---
>   drivers/hid/bpf/Kconfig | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
> index 298634fc3335..498232f9faa9 100644
> --- a/drivers/hid/bpf/Kconfig
> +++ b/drivers/hid/bpf/Kconfig
> @@ -4,7 +4,9 @@ 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 && \
> +		   FUNCTION_ERROR_INJECTION
>   	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


This fixes it for me!

Tested-by: Jon Hunter <jonathanh@...dia.com>

Thanks!
Jon

-- 
nvpublic