Re: [PATCH v6] bpf: Replace bpf_lpm_trie_key 0-length array with flexible array

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To: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Subject: Re: [PATCH v6] bpf: Replace bpf_lpm_trie_key 0-length array with flexible array
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Thu, 22 Feb 2024 10:47:04 -0800
Cc: Mark Rutland <mark.rutland@xxxxxxx>, "Gustavo A . R . Silva" <gustavoars@xxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Martin KaFai Lau <martin.lau@xxxxxxxxx>, Song Liu <song@xxxxxxxxxx>, Yonghong Song <yhs@xxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, KP Singh <kpsingh@xxxxxxxxxx>, Stanislav Fomichev <sdf@xxxxxxxxxx>, Hao Luo <haoluo@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Mykola Lysenko <mykolal@xxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Haowen Bai <baihaowen@xxxxxxxxx>, bpf@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, Yonghong Song <yonghong.song@xxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Jesper Dangaard Brouer <hawk@xxxxxxxxxx>, Joanne Koong <joannelkoong@xxxxxxxxx>, Yafang Shao <laoar.shao@xxxxxxxxx>, Kui-Feng Lee <kuifeng@xxxxxxxx>, Anton Protopopov <aspsk@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-hardening@xxxxxxxxxxxxxxx
In-reply-to: <20240222155612.it.533-kees@kernel.org>
References: <20240222155612.it.533-kees@kernel.org>

On Thu, Feb 22, 2024 at 07:56:15AM -0800, Kees Cook wrote:
> Replace deprecated 0-length array in struct bpf_lpm_trie_key with
> flexible array. Found with GCC 13:

Yay! This finally passes all of CI:
https://patchwork.kernel.org/project/netdevbpf/patch/20240222155612.it.533-kees@xxxxxxxxxx/

-- 
Kees Cook

References:
- [PATCH v6] bpf: Replace bpf_lpm_trie_key 0-length array with flexible array
  - From: Kees Cook

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