| 1 | /* Copyright (c) 2016 Facebook |
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| 2 | * |
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| 3 | * This program is free software; you can redistribute it and/or |
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| 4 | * modify it under the terms of version 2 of the GNU General Public |
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| 5 | * License as published by the Free Software Foundation. |
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| 6 | */ |
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| 7 | #include "vmlinux.h" |
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| 8 | #include <linux/version.h> |
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| 9 | #include <bpf/bpf_helpers.h> |
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| 10 | #include <bpf/bpf_tracing.h> |
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| 11 | #include <bpf/bpf_core_read.h> |
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| 12 | |
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| 13 | SEC("kprobe/__set_task_comm" ) |
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| 14 | int prog(struct pt_regs *ctx) |
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| 15 | { |
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| 16 | struct signal_struct *signal; |
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| 17 | struct task_struct *tsk; |
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| 18 | char oldcomm[TASK_COMM_LEN] = {}; |
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| 19 | char newcomm[TASK_COMM_LEN] = {}; |
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| 20 | u16 oom_score_adj; |
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| 21 | u32 pid; |
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| 22 | |
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| 23 | tsk = (void *)PT_REGS_PARM1_CORE(ctx); |
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| 24 | |
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| 25 | pid = BPF_CORE_READ(tsk, pid); |
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| 26 | bpf_core_read_str(oldcomm, sizeof(oldcomm), &tsk->comm); |
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| 27 | bpf_core_read_str(newcomm, sizeof(newcomm), |
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| 28 | (void *)PT_REGS_PARM2(ctx)); |
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| 29 | signal = BPF_CORE_READ(tsk, signal); |
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| 30 | oom_score_adj = BPF_CORE_READ(signal, oom_score_adj); |
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| 31 | return 0; |
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| 32 | } |
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| 33 | |
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| 34 | SEC("kprobe/fib_table_lookup" ) |
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| 35 | int prog2(struct pt_regs *ctx) |
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| 36 | { |
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| 37 | return 0; |
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| 38 | } |
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| 39 | |
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| 40 | char _license[] SEC("license" ) = "GPL" ; |
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| 41 | u32 _version SEC("version" ) = LINUX_VERSION_CODE; |
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| 42 | |
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