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