linux-kernel - Re: [PATCH bpf-next v2 1/7] bpf: Implement bpf_probe_read_kernel

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Message-ID: <CAADnVQ+bRvL-4n4ZB5QS2oUxvo3vhJHf=8=2No3WWqYHqSyBEg@mail.gmail.com>
Date: Sat, 25 Jan 2025 08:58:45 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: rsworktech@...look.com
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Matt Bobrowski <mattbobrowski@...gle.com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Mykola Lysenko <mykolal@...com>, 
	Shuah Khan <shuah@...nel.org>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, 
	linux-trace-kernel <linux-trace-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, 
	Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH bpf-next v2 1/7] bpf: Implement bpf_probe_read_kernel_dynptr
 helper

On Sat, Jan 25, 2025 at 12:30 AM Levi Zim via B4 Relay
<devnull+rsworktech.outlook.com@...nel.org> wrote:
>
> From: Levi Zim <rsworktech@...look.com>
>
> This patch add a helper function bpf_probe_read_kernel_dynptr:
>
> long bpf_probe_read_kernel_dynptr(const struct bpf_dynptr *dst,
>         u32 offset, u32 size, const void *unsafe_ptr, u64 flags);

We stopped adding helpers years ago.
Only new kfuncs are allowed.

This particular one doesn't look useful as-is.
The same logic can be expressed with
- create dynptr
- dynptr_slice
- copy_from_kernel

pw-bot: cr