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selftests/bpf: Add tracing multi attach fails test

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Adding tests for attach fails on tracing multi link.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260606123955.345967-27-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2026-06-06 14:39:51 +02:00 committed by Alexei Starovoitov
parent 69f25d4b0c
commit 1fd8328549
2 changed files with 114 additions and 0 deletions
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96
tools/testing/selftests/bpf/prog_tests/tracing_multi.c
View File

@ -8,6 +8,7 @@
#include "tracing_multi_module.skel.h"
#include "tracing_multi_intersect.skel.h"
#include "tracing_multi_session.skel.h"
#include "tracing_multi_fail.skel.h"
#include "trace_helpers.h"
static __u64 bpf_fentry_test_cookies[] = {
@ -498,6 +499,99 @@ static void test_session(void)
tracing_multi_session__destroy(skel);
}
static void test_attach_api_fails(void)
{
LIBBPF_OPTS(bpf_tracing_multi_opts, opts);
static const char * const func[] = {
"bpf_fentry_test2",
};
struct tracing_multi_fail *skel = NULL;
__u32 ids[2] = {}, *ids2 = NULL;
__u64 cookies[2];
skel = tracing_multi_fail__open_and_load();
if (!ASSERT_OK_PTR(skel, "tracing_multi_fail__open_and_load"))
return;
/* fail#1 (libbpf) pattern and opts NULL */
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
NULL, NULL);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -EINVAL, "fail_1"))
goto cleanup;
/* fail#2 (libbpf) pattern and ids */
LIBBPF_OPTS_RESET(opts,
.ids = ids,
.cnt = 2,
);
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
"bpf_fentry_test*", &opts);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -EINVAL, "fail_2"))
goto cleanup;
/* fail#3 (libbpf) pattern and cookies */
LIBBPF_OPTS_RESET(opts,
.ids = NULL,
.cnt = 2,
.cookies = cookies,
);
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
"bpf_fentry_test*", &opts);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -EINVAL, "fail_3"))
goto cleanup;
/* fail#4 (libbpf) bogus pattern */
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
"bpf_not_really_a_function*", NULL);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -EINVAL, "fail_4"))
goto cleanup;
/* fail#5 (kernel) abnormal cnt */
LIBBPF_OPTS_RESET(opts,
.ids = ids,
.cnt = INT_MAX,
);
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
NULL, &opts);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -E2BIG, "fail_5"))
goto cleanup;
/* fail#6 (kernel) attach sleepable program to not-allowed function */
ids2 = get_ids(func, 1, NULL);
if (!ASSERT_OK_PTR(ids2, "get_ids"))
goto cleanup;
LIBBPF_OPTS_RESET(opts,
.ids = ids2,
.cnt = 1,
);
skel->links.test_fentry_s = bpf_program__attach_tracing_multi(skel->progs.test_fentry_s,
NULL, &opts);
if (!ASSERT_EQ(libbpf_get_error(skel->links.test_fentry_s), -EINVAL, "fail_6"))
goto cleanup;
/* fail#7 (kernel) attach with duplicate id */
ids[0] = ids2[0];
ids[1] = ids2[0];
LIBBPF_OPTS_RESET(opts,
.ids = ids,
.cnt = 2,
);
skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry,
NULL, &opts);
ASSERT_EQ(libbpf_get_error(skel->links.test_fentry), -EINVAL, "fail_7");
cleanup:
tracing_multi_fail__destroy(skel);
free(ids2);
}
void test_tracing_multi_test(void)
{
#ifndef __x86_64__
@ -523,4 +617,6 @@ void test_tracing_multi_test(void)
test_link_api_ids(true);
if (test__start_subtest("session"))
test_session();
if (test__start_subtest("attach_api_fails"))
test_attach_api_fails();
}

18
tools/testing/selftests/bpf/progs/tracing_multi_fail.c Normal file
View File

@ -0,0 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
SEC("fentry.multi")
int BPF_PROG(test_fentry)
{
return 0;
}
SEC("fentry.multi.s")
int BPF_PROG(test_fentry_s)
{
return 0;
}