linux-kernel - Re: [PATCH bpf-next] bpf: btf: restore resolve

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Message-ID: <CAN+4W8hixyHYOwYRh-3WedS-a0KTQk8VQ4JxqM8y-DQY-yjsNA@mail.gmail.com>
Date:   Wed, 17 May 2023 10:01:09 +0100
From:   Lorenz Bauer <lmb@...valent.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH bpf-next] bpf: btf: restore resolve_mode when popping the
 resolve stack

On Wed, May 17, 2023 at 7:26 AM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 5/15/23 5:15 AM, Lorenz Bauer wrote:
> > In commit 9b459804ff99 ("btf: fix resolving BTF_KIND_VAR after ARRAY, STRUCT, UNION, PTR")
> > I fixed a bug that occurred during resolving of a DATASEC by strategically resetting
> > resolve_mode. This fixes the immediate bug but leaves us open to future bugs where
> > nested types have to be resolved.
>
> hmm... future bugs like when adding new BTF_KIND in the future?

It could just be refactoring of the codebase? What is the downside of
restoring the mode when popping the item? It also makes push and pop
symmetrical. Feel free to NACK if you don't want this change, not
going to push for it.