[PATCH v3 bpf-next 2/3] selftests/bpf: Add test for attaching uprobe with long event names

Feng Yang
2025-04-14T09:35:13Z

From: Feng Yang <yangfeng@kylinos.cn>

This test verifies that attaching uprobe/uretprobe with long event names
does not trigger EINVAL errors.

Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
---
.../selftests/bpf/prog_tests/attach_probe.c | 49 +++++++++++++++++++
1 file changed, 49 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
index 329c7862b52d..9b7f36f39c32 100644
--- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
+++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
@@ -122,6 +122,52 @@ static void test_attach_probe_manual(enum probe_attach_mode attach_mode)
test_attach_probe_manual__destroy(skel);
}

+/* attach uprobe/uretprobe long event name testings */
+static void test_attach_uprobe_long_event_name(void)
+{
+ DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
+ struct bpf_link *uprobe_link, *uretprobe_link;
+ struct test_attach_probe_manual *skel;
+ ssize_t uprobe_offset;
+ char path[PATH_MAX] = {0};
+
+ skel = test_attach_probe_manual__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load"))
+ return;
+
+ uprobe_offset = get_uprobe_offset(&trigger_func);
+ if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
+ goto cleanup;
+
+ if (!ASSERT_GT(readlink("/proc/self/exe", path, PATH_MAX - 1), 0, "readlink"))
+ goto cleanup;
+
+ /* manual-attach uprobe/uretprobe */
+ uprobe_opts.attach_mode = PROBE_ATTACH_MODE_LEGACY;
+ uprobe_opts.ref_ctr_offset = 0;
+ uprobe_opts.retprobe = false;
+ uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
+ 0 /* self pid */,
+ path,
+ uprobe_offset,
+ &uprobe_opts);
+ if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe_long_event_name"))
+ goto cleanup;
+ skel->links.handle_uprobe = uprobe_link;
+
+ uprobe_opts.retprobe = true;
+ uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe,
+ -1 /* any pid */,
+ path,
+ uprobe_offset, &uprobe_opts);
+ if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe_long_event_name"))
+ goto cleanup;
+ skel->links.handle_uretprobe = uretprobe_link;
+
+cleanup:
+ test_attach_probe_manual__destroy(skel);
+}
+
static void test_attach_probe_auto(struct test_attach_probe *skel)
{
struct bpf_link *uprobe_err_link;
@@ -323,6 +369,9 @@ void test_attach_probe(void)
if (test__start_subtest("uprobe-ref_ctr"))
test_uprobe_ref_ctr(skel);

+ if (test__start_subtest("uprobe-long_name"))
+ test_attach_uprobe_long_event_name();
+
cleanup:
test_attach_probe__destroy(skel);
ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_cleanup");
--
2.43.0