1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3 
4 #include "vmlinux.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7 
8 char _license[] SEC("license") = "GPL";
9 
10 struct {
11 	__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
12 	__uint(map_flags, BPF_F_NO_PREALLOC);
13 	__type(key, int);
14 	__type(value, __u64);
15 } task_storage SEC(".maps");
16 
17 int run_count = 0;
18 int valid_ptr_count = 0;
19 int null_ptr_count = 0;
20 
21 SEC("fentry/exit_creds")
BPF_PROG(trace_exit_creds,struct task_struct * task)22 int BPF_PROG(trace_exit_creds, struct task_struct *task)
23 {
24 	__u64 *ptr;
25 
26 	ptr = bpf_task_storage_get(&task_storage, task, 0,
27 				   BPF_LOCAL_STORAGE_GET_F_CREATE);
28 	if (ptr)
29 		__sync_fetch_and_add(&valid_ptr_count, 1);
30 	else
31 		__sync_fetch_and_add(&null_ptr_count, 1);
32 
33 	__sync_fetch_and_add(&run_count, 1);
34 	return 0;
35 }
36