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
19 struct user_event_mm {
20 struct list_head mms_link;
21 struct list_head enablers;
22 struct mm_struct *mm;
23 /* Used for one-shot lists, protected by event_mutex */
24 struct user_event_mm *next;
25 refcount_t refcnt;
26 refcount_t tasks;
27 struct rcu_work put_rwork;
28 };
29
30 extern void user_event_mm_dup(struct task_struct *t,
31 struct user_event_mm *old_mm);
32
33 extern void user_event_mm_remove(struct task_struct *t);
34
35 static inline void user_events_fork(struct task_struct *t,
36 unsigned long clone_flags)
37 {
38 struct user_event_mm *old_mm;
39
40 if (!t || !current->user_event_mm)
41 return;
42
43 old_mm = current->user_event_mm;
44
45 if (clone_flags & CLONE_VM) {
46 t->user_event_mm = old_mm;
47 refcount_inc(&old_mm->tasks);
48 return;
49 }
50
51 user_event_mm_dup(t, old_mm);
52 }
53
54 static inline void user_events_execve(struct task_struct *t)
55 {
56 if (!t || !t->user_event_mm)
57 return;
58
59 user_event_mm_remove(t);
60 }
61
62 static inline void user_events_exit(struct task_struct *t)
63 {
64 if (!t || !t->user_event_mm)
65 return;
66
67 user_event_mm_remove(t);
68 }
69 #else
70 static inline void user_events_fork(struct task_struct *t,
71 unsigned long clone_flags)
72 {
73 }
74
75 static inline void user_events_execve(struct task_struct *t)
76 {
77 }
78
79 static inline void user_events_exit(struct task_struct *t)
80 {
81 }
82 #endif /* CONFIG_USER_EVENTS */
83
84 #endif /* _LINUX_USER_EVENTS_H */
85
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