Currently, attach_probe covers manual single-kprobe attaches by func_name, but not the raw-address form that the PMU-based single-kprobe path can accept.
This commit adds PERF and LINK raw-address subtests by resolving SYS_NANOSLEEP_KPROBE_NAME through kallsyms, passing the absolute address in bpf_kprobe_opts.offset with func_name = NULL, and verifying that kprobe and kretprobe are still triggered. It also verifies that LEGACY rejects the same form. Signed-off-by: Hoyeon Lee <[email protected]> --- .../selftests/bpf/prog_tests/attach_probe.c | 82 +++++++++++++++++++ 1 file changed, 82 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c index 9e77e5da7097..817c4794d54e 100644 --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c @@ -123,6 +123,82 @@ static void test_attach_probe_manual(enum probe_attach_mode attach_mode) test_attach_probe_manual__destroy(skel); } +/* manual attach address-based kprobe/kretprobe testings */ +static void test_attach_kprobe_by_addr(enum probe_attach_mode attach_mode) +{ + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts); + struct test_attach_probe_manual *skel; + unsigned long func_addr; + + if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + return; + + func_addr = ksym_get_addr(SYS_NANOSLEEP_KPROBE_NAME); + if (!ASSERT_NEQ(func_addr, 0UL, "func_addr")) + return; + + skel = test_attach_probe_manual__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load")) + return; + + kprobe_opts.attach_mode = attach_mode; + kprobe_opts.retprobe = false; + kprobe_opts.offset = func_addr; + skel->links.handle_kprobe = + bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, + NULL, &kprobe_opts); + if (!ASSERT_OK_PTR(skel->links.handle_kprobe, "attach_kprobe_by_addr")) + goto cleanup; + + kprobe_opts.retprobe = true; + skel->links.handle_kretprobe = + bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe, + NULL, &kprobe_opts); + if (!ASSERT_OK_PTR(skel->links.handle_kretprobe, + "attach_kretprobe_by_addr")) + goto cleanup; + + /* trigger & validate kprobe && kretprobe */ + usleep(1); + + ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res"); + ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res"); + +cleanup: + test_attach_probe_manual__destroy(skel); +} + +/* reject legacy address-based kprobe attach */ +static void test_attach_kprobe_legacy_by_addr_reject(void) +{ + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts); + struct test_attach_probe_manual *skel; + unsigned long func_addr; + + if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + return; + + func_addr = ksym_get_addr(SYS_NANOSLEEP_KPROBE_NAME); + if (!ASSERT_NEQ(func_addr, 0UL, "func_addr")) + return; + + skel = test_attach_probe_manual__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load")) + return; + + kprobe_opts.attach_mode = PROBE_ATTACH_MODE_LEGACY; + kprobe_opts.offset = func_addr; + skel->links.handle_kprobe = + bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, + NULL, &kprobe_opts); + if (ASSERT_ERR_PTR(skel->links.handle_kprobe, + "attach_kprobe_legacy_by_addr")) + ASSERT_EQ(libbpf_get_error(skel->links.handle_kprobe), -ENOTSUP, + "attach_kprobe_legacy_by_addr_err"); + + test_attach_probe_manual__destroy(skel); +} + /* attach uprobe/uretprobe long event name testings */ static void test_attach_uprobe_long_event_name(void) { @@ -416,6 +492,12 @@ void test_attach_probe(void) test_attach_probe_manual(PROBE_ATTACH_MODE_PERF); if (test__start_subtest("manual-link")) test_attach_probe_manual(PROBE_ATTACH_MODE_LINK); + if (test__start_subtest("kprobe-perf-by-addr")) + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_PERF); + if (test__start_subtest("kprobe-link-by-addr")) + test_attach_kprobe_by_addr(PROBE_ATTACH_MODE_LINK); + if (test__start_subtest("kprobe-legacy-by-addr-reject")) + test_attach_kprobe_legacy_by_addr_reject(); if (test__start_subtest("auto")) test_attach_probe_auto(skel); -- 2.52.0
