netdev - Re: [PATCH bpf-next v3 03/18] selftests/bpf: Test referenced kptr arguments of struct

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Message-ID: <a3e6a8cbb7962c2ef49246be380a6bd7d2279196.camel@gmail.com>
Date: Mon, 03 Feb 2025 21:58:00 -0800
From: Eduard Zingerman <eddyz87@...il.com>
To: Amery Hung <ameryhung@...il.com>, netdev@...r.kernel.org
Cc: bpf@...r.kernel.org, daniel@...earbox.net, andrii@...nel.org, 
	alexei.starovoitov@...il.com, martin.lau@...nel.org, kuba@...nel.org, 
	edumazet@...gle.com, xiyou.wangcong@...il.com, cong.wang@...edance.com, 
	jhs@...atatu.com, sinquersw@...il.com, toke@...hat.com, jiri@...nulli.us, 
	stfomichev@...il.com, ekarani.silvestre@....ufcg.edu.br,
 yangpeihao@...u.edu.cn, 	yepeilin.cs@...il.com, ming.lei@...hat.com,
 kernel-team@...a.com
Subject: Re: [PATCH bpf-next v3 03/18] selftests/bpf: Test referenced kptr
 arguments of struct_ops programs

On Fri, 2025-01-31 at 11:28 -0800, Amery Hung wrote:
> From: Amery Hung <amery.hung@...edance.com>
> 
> Test referenced kptr acquired through struct_ops argument tagged with
> "__ref". The success case checks whether 1) a reference to the correct
> type is acquired, and 2) the referenced kptr argument can be accessed in
> multiple paths as long as it hasn't been released. In the fail cases,
> we first confirm that a referenced kptr acquried through a struct_ops
> argument is not allowed to be leaked. Then, we make sure this new
> referenced kptr acquiring mechanism does not accidentally allow referenced
> kptrs to flow into global subprograms through their arguments.
> 
> Signed-off-by: Amery Hung <amery.hung@...edance.com>
> ---

Acked-by: Eduard Zingerman <eddyz87@...il.com>

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