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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2022, Microsoft Corporation.
4 *
5 * Authors:
6 * Beau Belgrave <beaub@linux.microsoft.com>
7 */
8
9#ifndef _LINUX_USER_EVENTS_H
10#define _LINUX_USER_EVENTS_H
11
12#include <linux/list.h>
13#include <linux/refcount.h>
14#include <linux/mm_types.h>
15#include <linux/workqueue.h>
16#include <uapi/linux/user_events.h>
17
18#ifdef CONFIG_USER_EVENTS
19struct user_event_mm {
20 struct list_head link;
21 struct list_head enablers;
22 struct mm_struct *mm;
23 struct user_event_mm *next;
24 refcount_t refcnt;
25 refcount_t tasks;
26 struct rcu_work put_rwork;
27};
28
29extern void user_event_mm_dup(struct task_struct *t,
30 struct user_event_mm *old_mm);
31
32extern void user_event_mm_remove(struct task_struct *t);
33
34static inline void user_events_fork(struct task_struct *t,
35 unsigned long clone_flags)
36{
37 struct user_event_mm *old_mm;
38
39 if (!t || !current->user_event_mm)
40 return;
41
42 old_mm = current->user_event_mm;
43
44 if (clone_flags & CLONE_VM) {
45 t->user_event_mm = old_mm;
46 refcount_inc(&old_mm->tasks);
47 return;
48 }
49
50 user_event_mm_dup(t, old_mm);
51}
52
53static inline void user_events_execve(struct task_struct *t)
54{
55 if (!t || !t->user_event_mm)
56 return;
57
58 user_event_mm_remove(t);
59}
60
61static inline void user_events_exit(struct task_struct *t)
62{
63 if (!t || !t->user_event_mm)
64 return;
65
66 user_event_mm_remove(t);
67}
68#else
69static inline void user_events_fork(struct task_struct *t,
70 unsigned long clone_flags)
71{
72}
73
74static inline void user_events_execve(struct task_struct *t)
75{
76}
77
78static inline void user_events_exit(struct task_struct *t)
79{
80}
81#endif /* CONFIG_USER_EVENTS */
82
83#endif /* _LINUX_USER_EVENTS_H */