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
13SEC("kprobe/__set_task_comm")
14int 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
34SEC("kprobe/fib_table_lookup")
35int prog2(struct pt_regs *ctx)
36{
37	return 0;
38}
39
40char _license[] SEC("license") = "GPL";
41u32 _version SEC("version") = LINUX_VERSION_CODE;

 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
13SEC("kprobe/__set_task_comm")
14int 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
34SEC("kprobe/fib_table_lookup")
35int prog2(struct pt_regs *ctx)
36{
37	return 0;
38}
39
40char _license[] SEC("license") = "GPL";
41u32 _version SEC("version") = LINUX_VERSION_CODE;