linux-kernel - Re: [PATCH bpf RESEND v2 1/2] bpf: Fix memory access flags in helper prototypes

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Message-Id: <B91D5A7E-4967-416D-A2AC-CD3428F3C702@gmail.com>
Date: Tue, 20 Jan 2026 11:39:31 +0800
From: Zesen Liu <ftyghome@...il.com>
To: Eduard Zingerman <eddyz87@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>,
 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>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>,
 Daniel Xu <dxu@...uu.xyz>,
 bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org,
 netdev@...r.kernel.org,
 Shuran Liu <electronlsr@...il.com>,
 Peili Gao <gplhust955@...il.com>,
 Haoran Ni <haoran.ni.cs@...il.com>
Subject: Re: [PATCH bpf RESEND v2 1/2] bpf: Fix memory access flags in helper
 prototypes

[...]

> On Jan 20, 2026, at 04:24, Eduard Zingerman <eddyz87@...il.com> wrote:
> 
> Q: why ARG_PTR_TO_UNINIT_MEM here, but not for a previous function and
>   not for snprintf variants?

For bpf_get_stack_proto_raw_tp, I chose ARG_PTR_TO_UNINIT_MEM to be consistent with its siblings:

• bpf_get_stack_proto_tp (bpf_trace.c:1425)
• bpf_get_stack_proto (stackmap.c:525)
• bpf_get_stack_sleepable_proto (stackmap.c:541)

All of these are wrappers around the same core function bpf_get_stack() / __bpf_get_stack(), passing the buffer with identical semantics, and all use ARG_PTR_TO_UNINIT_MEM.