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

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This test verifies that attaching kprobe/kretprobe 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/20250417014848.59321-4-yangfeng59949@163.com
This commit is contained in:
Feng Yang 2025-04-17 09:48:48 +08:00 committed by Andrii Nakryiko
parent e1be7c45d2
commit 9b72f3e5b7
2 changed files with 39 additions and 0 deletions
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35
tools/testing/selftests/bpf/prog_tests/attach_probe.c
View File

@ -168,6 +168,39 @@ static void test_attach_uprobe_long_event_name(void)
test_attach_probe_manual__destroy(skel);
}
/* attach kprobe/kretprobe long event name testings */
static void test_attach_kprobe_long_event_name(void)
{
DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts);
struct bpf_link *kprobe_link, *kretprobe_link;
struct test_attach_probe_manual *skel;
skel = test_attach_probe_manual__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open_and_load"))
return;
/* manual-attach kprobe/kretprobe */
kprobe_opts.attach_mode = PROBE_ATTACH_MODE_LEGACY;
kprobe_opts.retprobe = false;
kprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe,
"bpf_testmod_looooooooooooooooooooooooooooooong_name",
&kprobe_opts);
if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe_long_event_name"))
goto cleanup;
skel->links.handle_kprobe = kprobe_link;
kprobe_opts.retprobe = true;
kretprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe,
"bpf_testmod_looooooooooooooooooooooooooooooong_name",
&kprobe_opts);
if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe_long_event_name"))
goto cleanup;
skel->links.handle_kretprobe = kretprobe_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;
@ -371,6 +404,8 @@ void test_attach_probe(void)
if (test__start_subtest("uprobe-long_name"))
test_attach_uprobe_long_event_name();
if (test__start_subtest("kprobe-long_name"))
test_attach_kprobe_long_event_name();
cleanup:
test_attach_probe__destroy(skel);

4
tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
View File

@ -134,6 +134,10 @@ bpf_testmod_test_arg_ptr_to_struct(struct bpf_testmod_struct_arg_1 *a) {
return bpf_testmod_test_struct_arg_result;
}
__weak noinline void bpf_testmod_looooooooooooooooooooooooooooooong_name(void)
{
}
__bpf_kfunc void
bpf_testmod_test_mod_kfunc(int i)
{