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9e6e60ec SD |
1 | /* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me> |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | ||
8 | #include <linux/ptrace.h> | |
9 | #include <uapi/linux/bpf.h> | |
10 | #include <linux/version.h> | |
11 | #include "bpf_helpers.h" | |
12 | #include <uapi/linux/utsname.h> | |
13 | ||
14 | struct bpf_map_def SEC("maps") cgroup_map = { | |
15 | .type = BPF_MAP_TYPE_CGROUP_ARRAY, | |
16 | .key_size = sizeof(u32), | |
17 | .value_size = sizeof(u32), | |
18 | .max_entries = 1, | |
19 | }; | |
20 | ||
21 | struct bpf_map_def SEC("maps") perf_map = { | |
22 | .type = BPF_MAP_TYPE_ARRAY, | |
23 | .key_size = sizeof(u32), | |
24 | .value_size = sizeof(u64), | |
25 | .max_entries = 1, | |
26 | }; | |
27 | ||
28 | /* Writes the last PID that called sync to a map at index 0 */ | |
29 | SEC("kprobe/sys_sync") | |
30 | int bpf_prog1(struct pt_regs *ctx) | |
31 | { | |
32 | u64 pid = bpf_get_current_pid_tgid(); | |
33 | int idx = 0; | |
34 | ||
35 | if (!bpf_current_task_under_cgroup(&cgroup_map, 0)) | |
36 | return 0; | |
37 | ||
38 | bpf_map_update_elem(&perf_map, &idx, &pid, BPF_ANY); | |
39 | return 0; | |
40 | } | |
41 | ||
42 | char _license[] SEC("license") = "GPL"; | |
43 | u32 _version SEC("version") = LINUX_VERSION_CODE; |