While playing with using libbpf for the Suricata project, we had
issues LLVM >= 4.0.1 generating ELF files that could not be loaded
with libbpf (tools/lib/bpf/).
During the troubleshooting phase, I wrote a test program and improved
the debugging output in libbpf. I turned this into a selftests
program, and it also serves as a code example for libbpf in itself.
I discovered that there are at least three ELF load issues with
libbpf. I left them as TODO comments in (tools/testing/selftests/bpf)
test_libbpf.sh. I've only fixed the load issue with eh_frames, and
other types of relo-section that does not have exec flags. We can
work on the other issues later.
---
Jesper Dangaard Brouer (5):
bpf: Sync kernel ABI header with tooling header for bpf_common.h
tools/libbpf: improve the pr_debug statements to contain section numbers
selftests/bpf: add test program for loading BPF ELF files
selftests/bpf: add selftest that use test_libbpf_open
tools/libbpf: handle issues with bpf ELF objects containing .eh_frames
tools/include/uapi/linux/bpf_common.h | 7 +
tools/lib/bpf/libbpf.c | 51 ++++++--
tools/testing/selftests/bpf/Makefile | 12 ++
tools/testing/selftests/bpf/test_libbpf.sh | 49 ++++++++
tools/testing/selftests/bpf/test_libbpf_open.c | 150 ++++++++++++++++++++++++
5 files changed, 253 insertions(+), 16 deletions(-)
create mode 100755 tools/testing/selftests/bpf/test_libbpf.sh
create mode 100644 tools/testing/selftests/bpf/test_libbpf_open.c
--
