[PATCHv2 bpf-next 0/2] bpf: Add bpf_vma_build_id_parse kfunc

[Jiri Olsa <jolsa@kernel.org>]

hi,
first version of this patchset added helper for this functionality,
but based Alexei's feedback [1], changing it to kfunc.

With the current build_id_parse function as kfunc we can't effectively
check buffer size provided by user. Therefore adding new function as
bpf kfunc:

  int bpf_vma_build_id_parse(struct vm_area_struct *vma,
                             unsigned char *build_id,
                             size_t build_id__sz);

that triggers kfunc's verifier check for build_id/build_id__sz buffer
size and calls build_id_parse.

thanks,
jirka


[1] https://lore.kernel.org/bpf/CAADnVQKyT4Mm4EdTCYK8c070E-BwPZS_FOkWKLJC80riSGmLTg@mail.gmail.com/
---
Jiri Olsa (2):
      bpf: Add bpf_vma_build_id_parse function and kfunc
      selftests/bpf: Add bpf_vma_build_id_parse kfunc test

 include/linux/bpf.h                                             |  5 +++++
 kernel/bpf/helpers.c                                            | 16 ++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/bpf_vma_build_id_parse.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/bpf_vma_build_id_parse.c      | 40 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 149 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_vma_build_id_parse.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_vma_build_id_parse.c