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Linux/samples/bpf/test_overhead_kprobe_kern.c

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  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 <linux/version.h>
  8 #include <linux/ptrace.h>
  9 #include <uapi/linux/bpf.h>
 10 #include "bpf_helpers.h"
 11 
 12 #define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
 13 
 14 SEC("kprobe/__set_task_comm")
 15 int prog(struct pt_regs *ctx)
 16 {
 17         struct signal_struct *signal;
 18         struct task_struct *tsk;
 19         char oldcomm[16] = {};
 20         char newcomm[16] = {};
 21         u16 oom_score_adj;
 22         u32 pid;
 23 
 24         tsk = (void *)PT_REGS_PARM1(ctx);
 25 
 26         pid = _(tsk->pid);
 27         bpf_probe_read(oldcomm, sizeof(oldcomm), &tsk->comm);
 28         bpf_probe_read(newcomm, sizeof(newcomm), (void *)PT_REGS_PARM2(ctx));
 29         signal = _(tsk->signal);
 30         oom_score_adj = _(signal->oom_score_adj);
 31         return 0;
 32 }
 33 
 34 SEC("kprobe/urandom_read")
 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 

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