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/ns_common.h>
12#include <linux/idr.h>
13
14/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
15#define MAX_PID_NS_LEVEL 32
16
17struct fs_pin;
18
19#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
20/* modes for vm.memfd_noexec sysctl */
21#define MEMFD_NOEXEC_SCOPE_EXEC 0 /* MFD_EXEC implied if unset */
22#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL 1 /* MFD_NOEXEC_SEAL implied if unset */
23#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED 2 /* same as 1, except MFD_EXEC rejected */
24#endif
25
26struct pid_namespace {
27 struct idr idr;
28 struct rcu_head rcu;
29 unsigned int pid_allocated;
30 struct task_struct *child_reaper;
31 struct kmem_cache *pid_cachep;
32 unsigned int level;
33 int pid_max;
34 struct pid_namespace *parent;
35#ifdef CONFIG_BSD_PROCESS_ACCT
36 struct fs_pin *bacct;
37#endif
38 struct user_namespace *user_ns;
39 struct ucounts *ucounts;
40 int reboot; /* group exit code if this pidns was rebooted */
41 struct ns_common ns;
42 struct work_struct work;
43#ifdef CONFIG_SYSCTL
44 struct ctl_table_set set;
45 struct ctl_table_header *sysctls;
46#if defined(CONFIG_MEMFD_CREATE)
47 int memfd_noexec_scope;
48#endif
49#endif
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 refcount_inc(r: &ns->ns.count);
61 return ns;
62}
63
64#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
65static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
66{
67 int scope = MEMFD_NOEXEC_SCOPE_EXEC;
68
69 for (; ns; ns = ns->parent)
70 scope = max(scope, READ_ONCE(ns->memfd_noexec_scope));
71
72 return scope;
73}
74#else
75static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
76{
77 return 0;
78}
79#endif
80
81extern struct pid_namespace *copy_pid_ns(unsigned long flags,
82 struct user_namespace *user_ns, struct pid_namespace *ns);
83extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
84extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
85extern void put_pid_ns(struct pid_namespace *ns);
86
87#else /* !CONFIG_PID_NS */
88#include <linux/err.h>
89
90static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
91{
92 return ns;
93}
94
95static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
96{
97 return 0;
98}
99
100static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
101 struct user_namespace *user_ns, struct pid_namespace *ns)
102{
103 if (flags & CLONE_NEWPID)
104 ns = ERR_PTR(-EINVAL);
105 return ns;
106}
107
108static inline void put_pid_ns(struct pid_namespace *ns)
109{
110}
111
112static inline void zap_pid_ns_processes(struct pid_namespace *ns)
113{
114 BUG();
115}
116
117static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
118{
119 return 0;
120}
121#endif /* CONFIG_PID_NS */
122
123extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
124void pidhash_init(void);
125void pid_idr_init(void);
126int register_pidns_sysctls(struct pid_namespace *pidns);
127void unregister_pidns_sysctls(struct pid_namespace *pidns);
128
129static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
130{
131 return task_active_pid_ns(tsk) == &init_pid_ns;
132}
133
134#endif /* _LINUX_PID_NS_H */
135

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source code of linux/include/linux/pid_namespace.h