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
14struct pidmap {
15 atomic_t nr_free;
16 void *page;
17};
18
19#define BITS_PER_PAGE (PAGE_SIZE * 8)
20#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
21#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
22
23struct fs_pin;
24
25enum { /* definitions for pid_namespace's hide_pid field */
26 HIDEPID_OFF = 0,
27 HIDEPID_NO_ACCESS = 1,
28 HIDEPID_INVISIBLE = 2,
29};
30
31struct pid_namespace {
32 struct kref kref;
33 struct pidmap pidmap[PIDMAP_ENTRIES];
34 struct rcu_head rcu;
35 int last_pid;
36 unsigned int nr_hashed;
37 struct task_struct *child_reaper;
38 struct kmem_cache *pid_cachep;
39 unsigned int level;
40 struct pid_namespace *parent;
41#ifdef CONFIG_PROC_FS
42 struct vfsmount *proc_mnt;
43 struct dentry *proc_self;
44 struct dentry *proc_thread_self;
45#endif
46#ifdef CONFIG_BSD_PROCESS_ACCT
47 struct fs_pin *bacct;
48#endif
49 struct user_namespace *user_ns;
50 struct ucounts *ucounts;
51 struct work_struct proc_work;
52 kgid_t pid_gid;
53 int hide_pid;
54 int reboot; /* group exit code if this pidns was rebooted */
55 struct ns_common ns;
56} __randomize_layout;
57
58extern struct pid_namespace init_pid_ns;
59
60#define PIDNS_HASH_ADDING (1U << 31)
61
62#ifdef CONFIG_PID_NS
63static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
64{
65 if (ns != &init_pid_ns)
66 kref_get(&ns->kref);
67 return ns;
68}
69
70extern struct pid_namespace *copy_pid_ns(unsigned long flags,
71 struct user_namespace *user_ns, struct pid_namespace *ns);
72extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
73extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
74extern void put_pid_ns(struct pid_namespace *ns);
75
76#else /* !CONFIG_PID_NS */
77#include <linux/err.h>
78
79static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
80{
81 return ns;
82}
83
84static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
85 struct user_namespace *user_ns, struct pid_namespace *ns)
86{
87 if (flags & CLONE_NEWPID)
88 ns = ERR_PTR(-EINVAL);
89 return ns;
90}
91
92static inline void put_pid_ns(struct pid_namespace *ns)
93{
94}
95
96static inline void zap_pid_ns_processes(struct pid_namespace *ns)
97{
98 BUG();
99}
100
101static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
102{
103 return 0;
104}
105#endif /* CONFIG_PID_NS */
106
107extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
108void pidhash_init(void);
109void pidmap_init(void);
110
111#endif /* _LINUX_PID_NS_H */