root/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c

DEFINITIONS

1. SEC

   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 
   8 char _license[] SEC("license") = "GPL";
   9 
  10 static volatile struct data {
  11         char in[256];
  12         char out[256];
  13 } data;
  14 
  15 struct task_struct {
  16         int pid;
  17         int tgid;
  18 };
  19 
  20 SEC("raw_tracepoint/sys_enter")
  21 int 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