[PATCHv3 bpf-next 22/24] selftests/bpf: Add tracing multi attach fails test
From: Jiri Olsa <jolsa@kernel.org>
Date: 2026-03-16 07:55:39
Also in:
linux-trace-kernel
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Linus Torvalds
Adding tests for attach fails on tracing multi link. Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- .../selftests/bpf/prog_tests/tracing_multi.c | 74 +++++++++++++++++++ .../selftests/bpf/progs/tracing_multi_fail.c | 19 +++++ 2 files changed, 93 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_fail.c
diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c
index 04d83c37495b..9f4c5af88e21 100644
--- a/tools/testing/selftests/bpf/prog_tests/tracing_multi.c
+++ b/tools/testing/selftests/bpf/prog_tests/tracing_multi.c@@ -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[] = {
@@ -480,6 +481,77 @@ 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; + __u64 cookies[2]; + + skel = tracing_multi_fail__open_and_load(); + if (!ASSERT_OK_PTR(skel, "tracing_multi_fail__open_and_load")) + return; + + /* fail#1 pattern and opts NULL */ + skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry, + NULL, NULL); + if (!ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi")) + goto cleanup; + + /* fail#2 pattern and ids */ + opts.ids = ids; + opts.cnt = 2; + + skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry, + "bpf_fentry_test*", &opts); + if (!ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi")) + goto cleanup; + + /* fail#3 pattern and cookies */ + opts.ids = NULL; + opts.cnt = 2; + opts.cookies = cookies; + + skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry, + "bpf_fentry_test*", &opts); + if (!ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi")) + goto cleanup; + + /* fail#4 bogus pattern */ + skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry, + "bpf_not_really_a_function*", NULL); + if (!ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi")) + goto cleanup; + + /* fail#5 abnormal cnt */ + opts.ids = ids; + opts.cnt = INT_MAX; + + skel->links.test_fentry = bpf_program__attach_tracing_multi(skel->progs.test_fentry, + NULL, &opts); + if (!ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi")) + goto cleanup; + + /* fail#6 attach sleepable program to not-allowed function */ + ids2 = get_ids(func, 1, NULL); + if (!ASSERT_OK_PTR(ids, "get_ids")) + goto cleanup; + + opts.ids = ids2; + opts.cnt = 1; + + skel->links.test_fentry_s = bpf_program__attach_tracing_multi(skel->progs.test_fentry_s, + NULL, &opts); + ASSERT_ERR_PTR(skel->links.test_fentry, "bpf_program__attach_tracing_multi"); + free(ids2); + +cleanup: + tracing_multi_fail__destroy(skel); +} + void test_tracing_multi_test(void) { #ifndef __x86_64__
@@ -505,4 +577,6 @@ 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(); }
diff --git a/tools/testing/selftests/bpf/progs/tracing_multi_fail.c b/tools/testing/selftests/bpf/progs/tracing_multi_fail.c
new file mode 100644
index 000000000000..8f769ddb9136
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/tracing_multi_fail.c@@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <stdbool.h> +#include <linux/bpf.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; +}
--
2.53.0