netdev - Re: [PATCH v3 bpf-next 04/18] libbpf: mark BPF subprogs with hidden visibility as static for BPF verifier

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Message-ID: <f432afb4-6077-b456-bab1-1484ddf5a44e@fb.com>
Date:   Fri, 23 Apr 2021 11:23:49 -0700
From:   Yonghong Song <yhs@...com>
To:     Andrii Nakryiko <andrii@...nel.org>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <ast@...com>, <daniel@...earbox.net>
CC:     <kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next 04/18] libbpf: mark BPF subprogs with hidden
 visibility as static for BPF verifier



On 4/23/21 11:13 AM, Andrii Nakryiko wrote:
> Define __hidden helper macro in bpf_helpers.h, which is a short-hand for
> __attribute__((visibility("hidden"))). Add libbpf support to mark BPF
> subprograms marked with __hidden as static in BTF information to enforce BPF
> verifier's static function validation algorithm, which takes more information
> (caller's context) into account during a subprogram validation.
> 
> Signed-off-by: Andrii Nakryiko <andrii@...nel.org>

Acked-by: Yonghong Song <yhs@...com>