LXR linux/tools/testing/selftests/bpf/progs/test_core_reloc

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (c) 2019 Facebook
   3
   4#include <linux/bpf.h>
   5#include <stdint.h>
   6#include "bpf_helpers.h"
   7
   8char _license[] SEC("license") = "GPL";
   9
  10static volatile struct data {
  11        char in[256];
  12        char out[256];
  13} data;
  14
  15struct task_struct {
  16        int pid;
  17        int tgid;
  18};
  19
  20SEC("raw_tracepoint/sys_enter")
  21int test_core_kernel(void *ctx)
  22{
  23        struct task_struct *task = (void *)bpf_get_current_task();
  24        uint64_t pid_tgid = bpf_get_current_pid_tgid();
  25        int pid, tgid;
  26
  27        if (BPF_CORE_READ(&pid, &task->pid) ||
  28            BPF_CORE_READ(&tgid, &task->tgid))
  29                return 1;
  30
  31        /* validate pid + tgid matches */
  32        data.out[0] = (((uint64_t)pid << 32) | tgid) == pid_tgid;
  33
  34        return 0;
  35}
  36
  37