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selftests/bpf: Add selftest for attaching tracing programs to functions in deny list

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The result:

 $ tools/testing/selftests/bpf/test_progs -t tracing_failure/tracing_deny
 #468/3   tracing_failure/tracing_deny:OK
 #468     tracing_failure:OK
 Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: KaFai Wan <kafai.wan@linux.dev>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250724151454.499040-4-kafai.wan@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
KaFai Wan 2025-07-24 23:14:53 +08:00 committed by Alexei Starovoitov
parent 863aab3d4d
commit a32f6f17a7
2 changed files with 39 additions and 0 deletions
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33
tools/testing/selftests/bpf/prog_tests/tracing_failure.c
View File

@ -28,10 +28,43 @@ static void test_bpf_spin_lock(bool is_spin_lock)
tracing_failure__destroy(skel);
}
static void test_tracing_deny(void)
{
struct tracing_failure *skel;
char log_buf[256];
int btf_id, err;
/* __rcu_read_lock depends on CONFIG_PREEMPT_RCU */
btf_id = libbpf_find_vmlinux_btf_id("__rcu_read_lock", BPF_TRACE_FENTRY);
if (btf_id <= 0) {
test__skip();
return;
}
skel = tracing_failure__open();
if (!ASSERT_OK_PTR(skel, "tracing_failure__open"))
return;
bpf_program__set_autoload(skel->progs.tracing_deny, true);
bpf_program__set_log_buf(skel->progs.tracing_deny, log_buf, sizeof(log_buf));
err = tracing_failure__load(skel);
if (!ASSERT_ERR(err, "tracing_failure__load"))
goto out;
ASSERT_HAS_SUBSTR(log_buf,
"Attaching tracing programs to function '__rcu_read_lock' is rejected.",
"log_buf");
out:
tracing_failure__destroy(skel);
}
void test_tracing_failure(void)
{
if (test__start_subtest("bpf_spin_lock"))
test_bpf_spin_lock(true);
if (test__start_subtest("bpf_spin_unlock"))
test_bpf_spin_lock(false);
if (test__start_subtest("tracing_deny"))
test_tracing_deny();
}

6
tools/testing/selftests/bpf/progs/tracing_failure.c
View File

@ -18,3 +18,9 @@ int BPF_PROG(test_spin_unlock, struct bpf_spin_lock *lock)
{
return 0;
}
SEC("?fentry/__rcu_read_lock")
int BPF_PROG(tracing_deny)
{
return 0;
}