1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PID_NS_H
3 #define _LINUX_PID_NS_H
4
5 #include <linux/sched.h>
6 #include <linux/bug.h>
7 #include <linux/mm.h>
8 #include <linux/workqueue.h>
9 #include <linux/threads.h>
10 #include <linux/nsproxy.h>
11 #include <linux/kref.h>
12 #include <linux/ns_common.h>
13 #include <linux/idr.h>
14
15
16 struct fs_pin;
17
18 enum { /* definitions for pid_namespace's hide_pid field */
19 HIDEPID_OFF = 0,
20 HIDEPID_NO_ACCESS = 1,
21 HIDEPID_INVISIBLE = 2,
22 };
23
24 struct pid_namespace {
25 struct kref kref;
26 struct idr idr;
27 struct rcu_head rcu;
28 unsigned int pid_allocated;
29 struct task_struct *child_reaper;
30 struct kmem_cache *pid_cachep;
31 unsigned int level;
32 struct pid_namespace *parent;
33 #ifdef CONFIG_PROC_FS
34 struct vfsmount *proc_mnt;
35 struct dentry *proc_self;
36 struct dentry *proc_thread_self;
37 #endif
38 #ifdef CONFIG_BSD_PROCESS_ACCT
39 struct fs_pin *bacct;
40 #endif
41 struct user_namespace *user_ns;
42 struct ucounts *ucounts;
43 struct work_struct proc_work;
44 kgid_t pid_gid;
45 int hide_pid;
46 int reboot; /* group exit code if this pidns was rebooted */
47 struct ns_common ns;
48 } __randomize_layout;
49
50 extern struct pid_namespace init_pid_ns;
51
52 #define PIDNS_ADDING (1U << 31)
53
54 #ifdef CONFIG_PID_NS
get_pid_ns(struct pid_namespace * ns)55 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
56 {
57 if (ns != &init_pid_ns)
58 kref_get(&ns->kref);
59 return ns;
60 }
61
62 extern struct pid_namespace *copy_pid_ns(unsigned long flags,
63 struct user_namespace *user_ns, struct pid_namespace *ns);
64 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
65 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
66 extern void put_pid_ns(struct pid_namespace *ns);
67
68 #else /* !CONFIG_PID_NS */
69 #include <linux/err.h>
70
get_pid_ns(struct pid_namespace * ns)71 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
72 {
73 return ns;
74 }
75
copy_pid_ns(unsigned long flags,struct user_namespace * user_ns,struct pid_namespace * ns)76 static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
77 struct user_namespace *user_ns, struct pid_namespace *ns)
78 {
79 if (flags & CLONE_NEWPID)
80 ns = ERR_PTR(-EINVAL);
81 return ns;
82 }
83
put_pid_ns(struct pid_namespace * ns)84 static inline void put_pid_ns(struct pid_namespace *ns)
85 {
86 }
87
zap_pid_ns_processes(struct pid_namespace * ns)88 static inline void zap_pid_ns_processes(struct pid_namespace *ns)
89 {
90 BUG();
91 }
92
reboot_pid_ns(struct pid_namespace * pid_ns,int cmd)93 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
94 {
95 return 0;
96 }
97 #endif /* CONFIG_PID_NS */
98
99 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
100 void pidhash_init(void);
101 void pid_idr_init(void);
102
103 #endif /* _LINUX_PID_NS_H */
104