linux-kernel - Re: [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for overriding tracepoint probes

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Message-ID: <CAPhsuW47BVGsszGU=27gKa1XOYLH+de1FgrHPVL4mftB2CvX9g@mail.gmail.com>
Date: Wed, 17 Sep 2025 13:02:49 -0700
From: Song Liu <song@...nel.org>
To: Fuyu Zhao <zhaofuyu@...o.com>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	martin.lau@...ux.dev, yonghong.song@...ux.dev, haoluo@...gle.com, 
	jolsa@...nel.org, eddyz87@...il.com, kpsingh@...nel.org, sdf@...ichev.me, 
	rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com, 
	shuah@...nel.org, willemb@...gle.com, kerneljasonxing@...il.com, 
	paul.chaignon@...il.com, chen.dylane@...ux.dev, memxor@...il.com, 
	martin.kelly@...wdstrike.com, ameryhung@...il.com, 
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	yikai.lin@...o.com
Subject: Re: [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for
 overriding tracepoint probes

On Wed, Sep 17, 2025 at 12:23 AM Fuyu Zhao <zhaofuyu@...o.com> wrote:
>
> Hi everyone,
>
> This patchset introduces a new BPF program type that allows overriding
> a tracepoint probe function registered via register_trace_*.
>
> Motivation
> ----------
> Tracepoint probe functions registered via register_trace_* in the kernel
> cannot be dynamically modified, changing a probe function requires recompiling
> the kernel and rebooting. Nor can BPF programs change an existing
> probe function.
>
> Overiding tracepoint supports a way to apply patches into kernel quickly
> (such as applying security ones), through predefined static tracepoints,
> without waiting for upstream integration.

IIUC, this work solves the same problem as raw tracepoint (raw_tp) or raw
tracepoint with btf (tp_btf).

Did I miss something?

Thanks,
Song