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selftests/bpf: Add test for raw-address single kprobe attach

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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 coverage. It resolves
SYS_NANOSLEEP_KPROBE_NAME through kallsyms, passes the absolute address
in bpf_kprobe_opts.offset with func_name = NULL, and verifies 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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20260401143116.185049-4-hoyeon.lee@suse.com
This commit is contained in:
Hoyeon Lee 2026-04-01 23:29:31 +09:00 committed by Andrii Nakryiko
parent e1621c7528
commit 9d77cefe8f
1 changed files with 80 additions and 0 deletions
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80
tools/testing/selftests/bpf/prog_tests/attach_probe.c
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@ -123,6 +123,80 @@ 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)
{
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)
{
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);
ASSERT_ERR_PTR(skel->links.handle_kprobe, "attach_kprobe_legacy_by_addr");
ASSERT_EQ(libbpf_get_error(skel->links.handle_kprobe),
-EOPNOTSUPP, "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)
{
@ -478,6 +552,12 @@ 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);