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1// SPDX-License-Identifier: GPL-2.02// Copyright (c) 2020 Facebook3 4#include <linux/ptrace.h>5#include <linux/bpf.h>6#include <bpf/bpf_helpers.h>7#include <bpf/bpf_tracing.h>8 9#define VAR_NUM 210 11struct hmap_elem {12 struct bpf_spin_lock lock;13 int var[VAR_NUM];14};15 16struct {17 __uint(type, BPF_MAP_TYPE_HASH);18 __uint(max_entries, 1);19 __type(key, __u32);20 __type(value, struct hmap_elem);21} hash_map SEC(".maps");22 23SEC("freplace/handle_kprobe")24int new_handle_kprobe(struct pt_regs *ctx)25{26 struct hmap_elem *val;27 int key = 0;28 29 val = bpf_map_lookup_elem(&hash_map, &key);30 if (!val)31 return 1;32 /* spin_lock in hash map */33 bpf_spin_lock(&val->lock);34 val->var[0] = 99;35 bpf_spin_unlock(&val->lock);36 37 return 0;38}39 40char _license[] SEC("license") = "GPL";41