netdev - [PATCH bpf-next v1 0/6] Typeless/weak ksym for gen

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Date:   Wed,  6 Oct 2021 05:58:47 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        netdev@...r.kernel.org
Subject: [PATCH bpf-next v1 0/6] Typeless/weak ksym for gen_loader + misc fixups

Patches (1,2,4) add typeless and weak ksym support to gen_loader. It is follow
up for the recent kfunc from modules series.

The later patches (5,6) are misc fixes for selftests, and patch 3 for libbpf
where we try to be careful to not end up with mod_btf->fd set as 0 (as that
leads to a confusing error message about btf_id not being found on load and it
is not clear what went wrong, instead we can just dup fd 0).

Kumar Kartikeya Dwivedi (6):
  bpf: Add bpf_kallsyms_lookup_name helper
  libbpf: Add typeless and weak ksym support to gen_loader
  libbpf: Ensure that module BTF fd is never 0
  bpf: selftests: Move test_ksyms_weak test to lskel, add libbpf test
  bpf: selftests: Fix fd cleanup in sk_lookup test
  bpf: selftests: Fix memory leak in test_ima

 include/linux/bpf.h                           |   1 +
 include/uapi/linux/bpf.h                      |  14 ++
 kernel/bpf/syscall.c                          |  24 ++++
 tools/include/uapi/linux/bpf.h                |  14 ++
 tools/lib/bpf/bpf_gen_internal.h              |  12 +-
 tools/lib/bpf/gen_loader.c                    | 123 ++++++++++++++++--
 tools/lib/bpf/libbpf.c                        |  27 ++--
 tools/testing/selftests/bpf/Makefile          |   2 +-
 .../selftests/bpf/prog_tests/ksyms_btf.c      |   6 +-
 .../bpf/prog_tests/ksyms_weak_libbpf.c        |  31 +++++
 .../selftests/bpf/prog_tests/sk_lookup.c      |  20 ++-
 .../selftests/bpf/prog_tests/test_ima.c       |   3 +-
 .../selftests/bpf/progs/test_ksyms_weak.c     |   3 +-
 13 files changed, 247 insertions(+), 33 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/ksyms_weak_libbpf.c

--
2.33.0