65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
// 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;
|
|
}
|