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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
commit | 863981e96738983919de841ec669e157e6bdaeb0 (patch) | |
tree | d6d89a12e7eb8017837c057935a2271290907f76 /samples/bpf/test_overhead_kprobe_kern.c | |
parent | 8dec7c70575785729a6a9e6719a955e9c545bcab (diff) |
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'samples/bpf/test_overhead_kprobe_kern.c')
-rw-r--r-- | samples/bpf/test_overhead_kprobe_kern.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/samples/bpf/test_overhead_kprobe_kern.c b/samples/bpf/test_overhead_kprobe_kern.c new file mode 100644 index 000000000..468a66a92 --- /dev/null +++ b/samples/bpf/test_overhead_kprobe_kern.c @@ -0,0 +1,41 @@ +/* Copyright (c) 2016 Facebook + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + */ +#include <linux/version.h> +#include <linux/ptrace.h> +#include <uapi/linux/bpf.h> +#include "bpf_helpers.h" + +#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;}) + +SEC("kprobe/__set_task_comm") +int prog(struct pt_regs *ctx) +{ + struct signal_struct *signal; + struct task_struct *tsk; + char oldcomm[16] = {}; + char newcomm[16] = {}; + u16 oom_score_adj; + u32 pid; + + tsk = (void *)PT_REGS_PARM1(ctx); + + pid = _(tsk->pid); + bpf_probe_read(oldcomm, sizeof(oldcomm), &tsk->comm); + bpf_probe_read(newcomm, sizeof(newcomm), (void *)PT_REGS_PARM2(ctx)); + signal = _(tsk->signal); + oom_score_adj = _(signal->oom_score_adj); + return 0; +} + +SEC("kprobe/urandom_read") +int prog2(struct pt_regs *ctx) +{ + return 0; +} + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = LINUX_VERSION_CODE; |