From: Leon Hwang <leon.hwang@linux.dev>
To: Tiezhu Yang <yangtiezhu@loongson.cn>,
KaFai Wan <kafai.wan@linux.dev>,
bpf@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jiri Olsa <jolsa@kernel.org>,
Emil Tsalapatis <emil@etsalapatis.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shuah Khan <shuah@kernel.org>,
Puranjay Mohan <puranjay@kernel.org>,
Anton Protopopov <a.s.protopopov@gmail.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [RFC PATCH bpf 1/6] bpf: Disallow interpreter fallback for user BPF_ADDR_SPACE_CAST insn
Date: Wed, 1 Jul 2026 14:21:59 +0800 [thread overview]
Message-ID: <d55e10b1-d883-4fcf-8fb3-8210db935e4a@linux.dev> (raw)
In-Reply-To: <af9c0a7e-13de-c227-849f-4b35d1fb74ff@loongson.cn>
On 1/7/26 09:26, Tiezhu Yang wrote:
[...]
>
> Hi all,
>
> Alexei said in another thread like this:
>
> ```
>> [3] https://lore.kernel.org/bpf/20260615025316.24429-1-
> yangtiezhu@loongson.cn/
>
> I don't think we need such fallback in patch [3].
> ```
> https://lore.kernel.org/bpf/DJMRIZ5PDWP4.12OOZ8H881H6O@gmail.com/
>
> Should I just drop my previous patch? To be honest, I'm not sure how to
> solve the issue mentioned in it. Is that a real problem, and does it
> need to be fixed? What is the next step?
>
It is a real issue.
Instead of fixing up helper calls, it seems better to prevent
interpreter fallback if the prog has any JIT-inlineable helper call.
Thanks,
Leon
next prev parent reply other threads:[~2026-07-01 6:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-26 15:43 [RFC PATCH bpf 0/6] bpf: Disallow interpreter fallback for interpreter-unsupported insns Leon Hwang
2026-06-26 15:43 ` [RFC PATCH bpf 1/6] bpf: Disallow interpreter fallback for user BPF_ADDR_SPACE_CAST insn Leon Hwang
2026-06-30 14:29 ` KaFai Wan
2026-06-30 14:36 ` Leon Hwang
2026-07-01 1:26 ` Tiezhu Yang
2026-07-01 6:21 ` Leon Hwang [this message]
2026-07-01 6:49 ` Tiezhu Yang
2026-07-01 7:02 ` Leon Hwang
2026-07-01 7:29 ` Tiezhu Yang
2026-07-01 8:04 ` Leon Huang Fu
2026-07-01 9:07 ` Tiezhu Yang
2026-07-01 18:47 ` Alexei Starovoitov
2026-06-26 15:43 ` [RFC PATCH bpf 2/6] bpf: Disallow interpreter fallback for arena insn Leon Hwang
2026-06-26 15:43 ` [RFC PATCH bpf 3/6] bpf: Disallow interpreter fallback for BPF_MOV64_PERCPU_REG insn Leon Hwang
2026-06-26 15:43 ` [RFC PATCH bpf 4/6] bpf: Disallow interpreter fallback for internal BPF_PROBE_ATOMIC insn Leon Hwang
2026-06-26 15:43 ` [RFC PATCH bpf 5/6] bpf: Disallow interpreter fallback for gotox insn Leon Hwang
2026-06-26 15:43 ` [RFC PATCH bpf 6/6] lib/test_bpf: Add interpreter-fallback tests Leon Hwang
2026-06-26 16:11 ` [RFC PATCH bpf 0/6] bpf: Disallow interpreter fallback for interpreter-unsupported insns Leon Hwang
2026-06-30 23:12 ` Alexei Starovoitov
2026-07-01 2:59 ` Leon Hwang
2026-07-01 3:05 ` Leon Hwang
2026-07-01 5:50 ` Alexei Starovoitov
2026-07-01 6:20 ` Leon Hwang
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