| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (c) 2021 Facebook */ |
| |
| #include "vmlinux.h" |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_tracing.h> |
| |
| char _license[] SEC("license") = "GPL"; |
| |
| struct { |
| __uint(type, BPF_MAP_TYPE_TASK_STORAGE); |
| __uint(map_flags, BPF_F_NO_PREALLOC); |
| __type(key, int); |
| __type(value, __u64); |
| } task_storage SEC(".maps"); |
| |
| int run_count = 0; |
| int valid_ptr_count = 0; |
| int null_ptr_count = 0; |
| |
| SEC("fentry/exit_creds") |
| int BPF_PROG(trace_exit_creds, struct task_struct *task) |
| { |
| __u64 *ptr; |
| |
| ptr = bpf_task_storage_get(&task_storage, task, 0, |
| BPF_LOCAL_STORAGE_GET_F_CREATE); |
| if (ptr) |
| __sync_fetch_and_add(&valid_ptr_count, 1); |
| else |
| __sync_fetch_and_add(&null_ptr_count, 1); |
| |
| __sync_fetch_and_add(&run_count, 1); |
| return 0; |
| } |