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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, long);
} enter_id SEC(".maps");
#define MAGIC_VALUE 0xabcd1234
pid_t target_pid = 0;
int mismatch_cnt = 0;
int enter_cnt = 0;
int exit_cnt = 0;
SEC("tp_btf/sys_enter")
int BPF_PROG(on_enter, struct pt_regs *regs, long id)
{
struct task_struct *task;
long *ptr;
task = bpf_get_current_task_btf();
if (task->pid != target_pid)
return 0;
ptr = bpf_task_storage_get(&enter_id, task, 0,
BPF_LOCAL_STORAGE_GET_F_CREATE);
if (!ptr)
return 0;
__sync_fetch_and_add(&enter_cnt, 1);
*ptr = MAGIC_VALUE + enter_cnt;
return 0;
}
SEC("tp_btf/sys_exit")
int BPF_PROG(on_exit, struct pt_regs *regs, long id)
{
struct task_struct *task;
long *ptr;
task = bpf_get_current_task_btf();
if (task->pid != target_pid)
return 0;
ptr = bpf_task_storage_get(&enter_id, task, 0,
BPF_LOCAL_STORAGE_GET_F_CREATE);
if (!ptr)
return 0;
__sync_fetch_and_add(&exit_cnt, 1);
if (*ptr != MAGIC_VALUE + exit_cnt)
__sync_fetch_and_add(&mismatch_cnt, 1);
return 0;
}
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