[PATCH bpf-next v3 0/2] libbpf: Introduce 'btf_custom_path' to 'bpf_obj_open_opts'

[Shuyi Cheng <chengshuyi@linux.alibaba.com>]

Patch 1: Add 'btf_custom_path' to 'bpf_obj_open_opts', allow developers 
to use custom btf to perform CO-RE relocation.

Patch 2: Fixed the memory leak problem pointed out by Andrii.

Changelog:
----------

v2: https://lore.kernel.org/bpf/CAEf4Bza_ua+tjxdhyy4nZ8Boeo+scipWmr_1xM1pC6N5wyuhAA@mail.gmail.com/T/#mf9cf86ae0ffa96180ac29e4fd12697eb70eccd0f
v2->v3:
--- Load the BTF specified by btf_custom_path to btf_vmlinux_override 
    instead of btf_bmlinux.
--- Fix the memory leak that may be introduced by the second version 
    of the patch.
--- Add a new patch to fix the possible memory leak caused by 
    obj->kconfig.

v1: https://lore.kernel.org/bpf/CAEf4BzaGjEC4t1OefDo11pj2-HfNy0BLhs_G2UREjRNTmb2u=A@mail.gmail.com/t/#m4d9f7c6761fbd2b436b5dfe491cd864b70225804
v1->v2:
-- Change custom_btf_path to btf_custom_path.
-- If the length of btf_custom_path of bpf_obj_open_opts is too long, 
   return ERR_PTR(-ENAMETOOLONG).
-- Add `custom BTF is in addition to vmlinux BTF`
   with btf_custom_path field.

Shuyi Cheng (2):
  libbpf: Introduce 'btf_custom_path' to 'bpf_obj_open_opts'
  libbpf: Fix the possible memory leak caused by obj->kconfig

 tools/lib/bpf/libbpf.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++----
 tools/lib/bpf/libbpf.h |  6 +++++-
 2 files changed, 53 insertions(+), 5 deletions(-)

-- 
1.8.3.1