selftests/bpf: Add stacktrace test for kprobe/kretprobe

Signed-off-by: Jiri Olsa <[email protected]>

Author: olsajiri

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

@@ -154,12 +154,62 @@ static void test_stacktrace_kprobe_multi(bool retprobe)
 	stacktrace_map__destroy(skel);
 }
 
+static void test_stacktrace_kprobe(bool retprobe)
+{
+	LIBBPF_OPTS(bpf_kprobe_opts, opts,
+		.retprobe = retprobe
+	);
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+	struct stacktrace_map *skel;
+	int prog_fd, err;
+
+	skel = stacktrace_map__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "stacktrace_map__open_and_load"))
+		return;
+
+	skel->links.kprobe_stack_test = bpf_program__attach_kprobe_opts(skel->progs.kprobe_stack_test,
+					       "bpf_testmod_stacktrace_test", &opts);
+	if (!ASSERT_OK_PTR(skel->links.kprobe_stack_test, "bpf_program__attach_kprobe_opts"))
+		goto cleanup;
+
+	prog_fd = bpf_program__fd(skel->progs.trigger);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_run");
+	ASSERT_EQ(topts.retval, 0, "test_run");
+
+	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_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"));
+	} 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_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"));
+	}
+
+cleanup:
+	stacktrace_map__destroy(skel);
+}
+
 void test_stacktrace(void)
 {
 	if (test__start_subtest("kprobe_multi"))
 		test_stacktrace_kprobe_multi(false);
 	if (test__start_subtest("kretprobe_multi"))
 		test_stacktrace_kprobe_multi(true);
+	if (test__start_subtest("kprobe"))
+		test_stacktrace_kprobe(false);
+	if (test__start_subtest("kretprobe"))
+		test_stacktrace_kprobe(true);
 }
 #else
 void test_stacktrace(void)

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

@@ -112,4 +112,11 @@ int kprobe_multi_stack_test(struct pt_regs *ctx)
 	return 0;
 }
 
+SEC("kprobe")
+int kprobe_stack_test(struct pt_regs *ctx)
+{
+	stack_key = bpf_get_stackid(ctx, &stackmap, 0);
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";