1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */ |
3 | |
4 | #include "vmlinux.h" |
5 | #include <bpf/bpf_helpers.h> |
6 | #include <bpf/bpf_tracing.h> |
7 | #include "bpf_misc.h" |
8 | #include "bpf_experimental.h" |
9 | |
10 | char _license[] SEC("license" ) = "GPL" ; |
11 | |
12 | pid_t target_pid; |
13 | int procs_cnt, threads_cnt, proc_threads_cnt, invalid_cnt; |
14 | |
15 | void bpf_rcu_read_lock(void) __ksym; |
16 | void bpf_rcu_read_unlock(void) __ksym; |
17 | |
18 | SEC("fentry.s/" SYS_PREFIX "sys_getpgid" ) |
19 | int iter_task_for_each_sleep(void *ctx) |
20 | { |
21 | struct task_struct *cur_task = bpf_get_current_task_btf(); |
22 | struct task_struct *pos; |
23 | |
24 | if (cur_task->pid != target_pid) |
25 | return 0; |
26 | procs_cnt = threads_cnt = proc_threads_cnt = 0; |
27 | |
28 | bpf_rcu_read_lock(); |
29 | bpf_for_each(task, pos, NULL, ~0U) { |
30 | /* Below instructions shouldn't be executed for invalid flags */ |
31 | invalid_cnt++; |
32 | } |
33 | |
34 | bpf_for_each(task, pos, NULL, BPF_TASK_ITER_PROC_THREADS) { |
35 | /* Below instructions shouldn't be executed for invalid task__nullable */ |
36 | invalid_cnt++; |
37 | } |
38 | |
39 | bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_PROCS) |
40 | if (pos->pid == target_pid) |
41 | procs_cnt++; |
42 | |
43 | bpf_for_each(task, pos, cur_task, BPF_TASK_ITER_PROC_THREADS) |
44 | proc_threads_cnt++; |
45 | |
46 | bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_THREADS) |
47 | if (pos->tgid == target_pid) |
48 | threads_cnt++; |
49 | bpf_rcu_read_unlock(); |
50 | return 0; |
51 | } |
52 | |