Re: [PATCH bpf-next v2 2/2] selftests/bpf: test for malformed BPF_CORE_TYPE_ID_LOCAL relocation

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On Thu, Aug 22, 2024 at 9:55 AM Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
>
> On Thu, Aug 22, 2024 at 9:51 AM Andrii Nakryiko
> <andrii.nakryiko@xxxxxxxxx> wrote:
> >
> > > > I don't see why we can't extend the bpf_prog_load() API to allow to
> > > > specify those. (would allow to avoid open-coding this whole bpf_attr
> > > > business, but it's fine as is as well)
> > >
> > > Maybe extend API as a followup?
> > > The test won't change much, just options instead of bpf_attr.
> >
> > yep, follow up is good, thanks
>
> I don't think we want this extension to bpf_prog_load() libbpf api.
> This is internal gen_loader use.

bpf_prog_load() is just a wrapper around BPF_PROG_LOAD command of
bpf() syscall, so it feels appropriate to expose all the available
kernel functionality, even if libbpf itself doesn't use some parts of
it. Those core_relos fields are there in bpf_attr and are part of
UAPI, what's wrong with making them available in low-level API?





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