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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "cgrp_kfunc_common.h"
#include "cpumask_common.h"
#include "task_kfunc_common.h"
char _license[] SEC("license") = "GPL";
/***************
* Task kfuncs *
***************/
static void task_kfunc_load_test(void)
{
struct task_struct *current, *ref_1, *ref_2;
current = bpf_get_current_task_btf();
ref_1 = bpf_task_from_pid(current->pid);
if (!ref_1)
return;
ref_2 = bpf_task_acquire(ref_1);
if (ref_2)
bpf_task_release(ref_2);
bpf_task_release(ref_1);
}
SEC("raw_tp")
__failure __msg("calling kernel function")
int BPF_PROG(task_kfunc_raw_tp)
{
task_kfunc_load_test();
return 0;
}
SEC("syscall")
__success
int BPF_PROG(task_kfunc_syscall)
{
task_kfunc_load_test();
return 0;
}
/*****************
* cgroup kfuncs *
*****************/
static void cgrp_kfunc_load_test(void)
{
struct cgroup *cgrp, *ref;
cgrp = bpf_cgroup_from_id(0);
if (!cgrp)
return;
ref = bpf_cgroup_acquire(cgrp);
if (!ref) {
bpf_cgroup_release(cgrp);
return;
}
bpf_cgroup_release(ref);
bpf_cgroup_release(cgrp);
}
SEC("raw_tp")
__failure __msg("calling kernel function")
int BPF_PROG(cgrp_kfunc_raw_tp)
{
cgrp_kfunc_load_test();
return 0;
}
SEC("syscall")
__success
int BPF_PROG(cgrp_kfunc_syscall)
{
cgrp_kfunc_load_test();
return 0;
}
/******************
* cpumask kfuncs *
******************/
static void cpumask_kfunc_load_test(void)
{
struct bpf_cpumask *alloc, *ref;
alloc = bpf_cpumask_create();
if (!alloc)
return;
ref = bpf_cpumask_acquire(alloc);
bpf_cpumask_set_cpu(0, alloc);
bpf_cpumask_test_cpu(0, (const struct cpumask *)ref);
bpf_cpumask_release(ref);
bpf_cpumask_release(alloc);
}
SEC("raw_tp")
__failure __msg("calling kernel function")
int BPF_PROG(cpumask_kfunc_raw_tp)
{
cpumask_kfunc_load_test();
return 0;
}
SEC("syscall")
__success
int BPF_PROG(cpumask_kfunc_syscall)
{
cpumask_kfunc_load_test();
return 0;
}
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