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 <hoyeon.lee@suse.com>
---
 .../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