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selftests/bpf: Add test for attaching uprobe with long event names

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

Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250417014848.59321-3-yangfeng59949@163.com
This commit is contained in:
Feng Yang
2025-04-17 09:48:47 +08:00
committed by Andrii Nakryiko
parent 4dde20b1aa
commit e1be7c45d2
1 changed files with 49 additions and 0 deletions
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49
tools/testing/selftests/bpf/prog_tests/attach_probe.c
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@@ -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");