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