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selftests/bpf: add subprog to BPF object file with no entry programs

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Add a subprogram to BPF object file that otherwise has no entry BPF
programs to validate that libbpf can still load this correctly.

Until this was fixed, user could expect this very confusing error message:

  libbpf: prog 'dangling_subprog': missing BPF prog type, check ELF section name '.text'
  libbpf: prog 'dangling_subprog': failed to load: -22
  libbpf: failed to load object 'struct_ops_detach'
  libbpf: failed to load BPF skeleton 'struct_ops_detach': -22

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20241010211731.4121837-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2024-10-10 14:17:31 -07:00 committed by Alexei Starovoitov
parent db089c9158
commit 82370ed5ad
1 changed files with 12 additions and 0 deletions
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12
tools/testing/selftests/bpf/progs/struct_ops_detach.c
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@ -6,5 +6,17 @@
char _license[] SEC("license") = "GPL";
/*
* This subprogram validates that libbpf handles the situation in which BPF
* object has subprograms in .text section, but has no entry BPF programs.
* At some point that was causing issues due to legacy logic of treating such
* subprogram as entry program (with unknown program type, which would fail).
*/
int dangling_subprog(void)
{
/* do nothing, just be here */
return 0;
}
SEC(".struct_ops.link")
struct bpf_testmod_ops testmod_do_detach;