1 /* Copyright (c) 2016 Facebook
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 #include "vmlinux.h"
8 #include <linux/version.h>
9 #include <bpf/bpf_helpers.h>
10 #include <bpf/bpf_tracing.h>
11 #include <bpf/bpf_core_read.h>
12
13 SEC("kprobe/__set_task_comm")
14 int prog(struct pt_regs *ctx)
15 {
16 struct signal_struct *signal;
17 struct task_struct *tsk;
18 char oldcomm[TASK_COMM_LEN] = {};
19 char newcomm[TASK_COMM_LEN] = {};
20 u16 oom_score_adj;
21 u32 pid;
22
23 tsk = (void *)PT_REGS_PARM1_CORE(ctx);
24
25 pid = BPF_CORE_READ(tsk, pid);
26 bpf_core_read_str(oldcomm, sizeof(oldcomm), &tsk->comm);
27 bpf_core_read_str(newcomm, sizeof(newcomm),
28 (void *)PT_REGS_PARM2(ctx));
29 signal = BPF_CORE_READ(tsk, signal);
30 oom_score_adj = BPF_CORE_READ(signal, oom_score_adj);
31 return 0;
32 }
33
34 SEC("kprobe/fib_table_lookup")
35 int prog2(struct pt_regs *ctx)
36 {
37 return 0;
38 }
39
40 char _license[] SEC("license") = "GPL";
41 u32 _version SEC("version") = LINUX_VERSION_CODE;
42
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.