Commit 7373f97e authored by Jiri Olsa's avatar Jiri Olsa Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add stacktrace ips test for kprobe/kretprobe 



Adding test that attaches kprobe/kretprobe and verifies the
ORC stacktrace matches expected functions.

The test is only for ORC unwinder to keep it simple.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260126211837.472802-5-jolsa@kernel.org
parent 0207f949

tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c

+50 −0
Original line number Diff line number Diff line
@@ -137,6 +137,52 @@ static void test_stacktrace_ips_raw_tp(void) 
	stacktrace_ips__destroy(skel);

}



static void test_stacktrace_ips_kprobe(bool retprobe)

{

	LIBBPF_OPTS(bpf_kprobe_opts, opts,

		.retprobe = retprobe

	);

	LIBBPF_OPTS(bpf_test_run_opts, topts);

	struct stacktrace_ips *skel;



	skel = stacktrace_ips__open_and_load();

	if (!ASSERT_OK_PTR(skel, "stacktrace_ips__open_and_load"))

		return;



	if (!skel->kconfig->CONFIG_UNWINDER_ORC) {

		test__skip();

		goto cleanup;

	}



	skel->links.kprobe_test = bpf_program__attach_kprobe_opts(

						skel->progs.kprobe_test,

						"bpf_testmod_stacktrace_test", &opts);

	if (!ASSERT_OK_PTR(skel->links.kprobe_test, "bpf_program__attach_kprobe_opts"))

		goto cleanup;



	trigger_module_test_read(1);



	load_kallsyms();



	if (retprobe) {

		check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 4,

				     ksym_get_addr("bpf_testmod_stacktrace_test_3"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_2"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_1"),

				     ksym_get_addr("bpf_testmod_test_read"));

	} else {

		check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 5,

				     ksym_get_addr("bpf_testmod_stacktrace_test"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_3"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_2"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_1"),

				     ksym_get_addr("bpf_testmod_test_read"));

	}



cleanup:

	stacktrace_ips__destroy(skel);

}



static void __test_stacktrace_ips(void)

{

	if (test__start_subtest("kprobe_multi"))
@@ -145,6 +191,10 @@ static void __test_stacktrace_ips(void) 
		test_stacktrace_ips_kprobe_multi(true);

	if (test__start_subtest("raw_tp"))

		test_stacktrace_ips_raw_tp();

	if (test__start_subtest("kprobe"))

		test_stacktrace_ips_kprobe(false);

	if (test__start_subtest("kretprobe"))

		test_stacktrace_ips_kprobe(true);

}

#else

static void __test_stacktrace_ips(void)

tools/testing/selftests/bpf/progs/stacktrace_ips.c

+7 −0
Original line number Diff line number Diff line
@@ -31,6 +31,13 @@ int unused(void) 


__u32 stack_key;



SEC("kprobe")

int kprobe_test(struct pt_regs *ctx)

{

	stack_key = bpf_get_stackid(ctx, &stackmap, 0);

	return 0;

}



SEC("kprobe.multi")

int kprobe_multi_test(struct pt_regs *ctx)

{