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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - samples/bpf/test_overhead_kprobe_kern.c
1 /* Copyright (c) 2016 Facebook
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.
7 #include <linux/version.h>
8 #include <linux/ptrace.h>
9 #include <uapi/linux/bpf.h>
10 #include "bpf_helpers.h"
12 #define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
14 SEC("kprobe/__set_task_comm")
15 int prog(struct pt_regs
*ctx
)
17 struct signal_struct
*signal
;
18 struct task_struct
*tsk
;
19 char oldcomm
[16] = {};
20 char newcomm
[16] = {};
24 tsk
= (void *)PT_REGS_PARM1(ctx
);
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
);
34 SEC("kprobe/urandom_read")
35 int prog2(struct pt_regs
*ctx
)
40 char _license
[] SEC("license") = "GPL";
41 u32 _version
SEC("version") = LINUX_VERSION_CODE
;