1// SPDX-License-Identifier: GPL-2.0 2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ 3#include <vmlinux.h> 4#include <bpf/bpf_tracing.h> 5#include "../bpf_testmod/bpf_testmod.h" 6 7char _license[] SEC("license") = "GPL"; 8 9pid_t tgid = 0; 10 11/* This is a test BPF program that uses struct_ops to access an argument 12 * that may be NULL. This is a test for the verifier to ensure that it can 13 * rip PTR_MAYBE_NULL correctly. 14 */ 15SEC("struct_ops/test_maybe_null") 16int BPF_PROG(test_maybe_null, int dummy, 17 struct task_struct *task) 18{ 19 if (task) 20 tgid = task->tgid; 21 22 return 0; 23} 24 25SEC(".struct_ops.link") 26struct bpf_testmod_ops testmod_1 = { 27 .test_maybe_null = (void *)test_maybe_null, 28}; 29 30