Today libbpf documents single-kprobe attach through func_name, with an optional offset. For the PMU-based non-legacy path, func_name = NULL with an absolute address in offset already works as well, but that is not described in the API.
This patchset clarifies this behavior. The first commit clarifies that, for the PMU-based path, callers can use func_name = NULL with an absolute address in offset for raw-address attach, and makes legacy tracefs/debugfs kprobes reject that form. The second commit adds PERF and LINK selftests for the raw-address form, and checks that LEGACY rejects it. --- Changes in v3: - Drop bpf_kprobe_opts.addr and reuse offset when func_name is NULL - Make legacy tracefs/debugfs kprobes reject the raw-address form - Update selftests to cover PERF/LINK raw-address attach and LEGACY reject Changes in v2: - Fix line wrapping and indentation Hoyeon Lee (2): libbpf: clarify raw-address single kprobe attach behavior selftests/bpf: add test for raw-address single kprobe attach tools/lib/bpf/libbpf.c | 33 ++++++-- tools/lib/bpf/libbpf.h | 3 +- .../selftests/bpf/prog_tests/attach_probe.c | 82 +++++++++++++++++++ 3 files changed, 108 insertions(+), 10 deletions(-) -- 2.52.0
