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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include "tracing_failure.skel.h"
static void test_bpf_spin_lock(bool is_spin_lock)
{
struct tracing_failure *skel;
int err;
skel = tracing_failure__open();
if (!ASSERT_OK_PTR(skel, "tracing_failure__open"))
return;
if (is_spin_lock)
bpf_program__set_autoload(skel->progs.test_spin_lock, true);
else
bpf_program__set_autoload(skel->progs.test_spin_unlock, true);
err = tracing_failure__load(skel);
if (!ASSERT_OK(err, "tracing_failure__load"))
goto out;
err = tracing_failure__attach(skel);
ASSERT_ERR(err, "tracing_failure__attach");
out:
tracing_failure__destroy(skel);
}
static void test_tracing_fail_prog(const char *prog_name, const char *exp_msg)
{
struct tracing_failure *skel;
struct bpf_program *prog;
char log_buf[256];
int err;
skel = tracing_failure__open();
if (!ASSERT_OK_PTR(skel, "tracing_failure__open"))
return;
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
goto out;
bpf_program__set_autoload(prog, true);
bpf_program__set_log_buf(prog, log_buf, sizeof(log_buf));
err = tracing_failure__load(skel);
if (!ASSERT_ERR(err, "tracing_failure__load"))
goto out;
ASSERT_HAS_SUBSTR(log_buf, exp_msg, "log_buf");
out:
tracing_failure__destroy(skel);
}
static void test_tracing_deny(void)
{
int btf_id;
/* __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;
}
test_tracing_fail_prog("tracing_deny",
"Attaching tracing programs to function '__rcu_read_lock' is rejected.");
}
static void test_fexit_noreturns(void)
{
test_tracing_fail_prog("fexit_noreturns",
"Attaching fexit/fmod_ret to __noreturn function 'do_exit' is rejected.");
}
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();
if (test__start_subtest("fexit_noreturns"))
test_fexit_noreturns();
}
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