netdev - Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st

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Date:   Sat, 23 Jan 2021 21:21:57 +0100
From:   Mark Wielaard <mark@...mp.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, dwarves@...r.kernel.org,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Hao Luo <haoluo@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Joe Lawrence <joe.lawrence@...hat.com>
Subject: Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's
 st_shndx values

Hi,

On Sat, 2021-01-23 at 12:07 -0800, Andrii Nakryiko wrote:
> > the latest upstream code seems to set it always,
> > but I agree we should be careful
> 
> oh, then maybe it's not necessary. I honestly don't even know where
> the authoritative source code of libelf is, so I just found some
> random source code with Google.

The elfutils.org libelf implementation can be found here:
https://sourceware.org/git/?p=elfutils.git;a=tree;f=libelf;hb=HEAD

There are some other implementations, but some aren't maintained and
others aren't packaged for any distro (anymore). libelf is a semi-
standard "SVR4 Unix" library, so you might also find it for some none
GNU/Linux OSes like Solaris. The ELF specification itself is contained
in the System V Application Binary Interface (gABI). The libelf library
itself isn't actually officially part of the specification. But we
still do try to keep the implementations (source) compatible through
the generic-abi mailinglist.

Cheers,

Mark