Linux kernel mirror (for testing)
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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/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/*
21 * sysctl for vm.memfd_noexec
22 * 0: memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL
23 * acts like MFD_EXEC was set.
24 * 1: memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL
25 * acts like MFD_NOEXEC_SEAL was set.
26 * 2: memfd_create() without MFD_NOEXEC_SEAL will be
27 * rejected.
28 */
29#define MEMFD_NOEXEC_SCOPE_EXEC 0
30#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL 1
31#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED 2
32#endif
33
34struct pid_namespace {
35 struct idr idr;
36 struct rcu_head rcu;
37 unsigned int pid_allocated;
38 struct task_struct *child_reaper;
39 struct kmem_cache *pid_cachep;
40 unsigned int level;
41 struct pid_namespace *parent;
42#ifdef CONFIG_BSD_PROCESS_ACCT
43 struct fs_pin *bacct;
44#endif
45 struct user_namespace *user_ns;
46 struct ucounts *ucounts;
47 int reboot; /* group exit code if this pidns was rebooted */
48 struct ns_common ns;
49#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
50 /* sysctl for vm.memfd_noexec */
51 int memfd_noexec_scope;
52#endif
53} __randomize_layout;
54
55extern struct pid_namespace init_pid_ns;
56
57#define PIDNS_ADDING (1U << 31)
58
59#ifdef CONFIG_PID_NS
60static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
61{
62 if (ns != &init_pid_ns)
63 refcount_inc(&ns->ns.count);
64 return ns;
65}
66
67extern struct pid_namespace *copy_pid_ns(unsigned long flags,
68 struct user_namespace *user_ns, struct pid_namespace *ns);
69extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
70extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
71extern void put_pid_ns(struct pid_namespace *ns);
72
73#else /* !CONFIG_PID_NS */
74#include <linux/err.h>
75
76static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
77{
78 return ns;
79}
80
81static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
82 struct user_namespace *user_ns, struct pid_namespace *ns)
83{
84 if (flags & CLONE_NEWPID)
85 ns = ERR_PTR(-EINVAL);
86 return ns;
87}
88
89static inline void put_pid_ns(struct pid_namespace *ns)
90{
91}
92
93static inline void zap_pid_ns_processes(struct pid_namespace *ns)
94{
95 BUG();
96}
97
98static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
99{
100 return 0;
101}
102#endif /* CONFIG_PID_NS */
103
104extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
105void pidhash_init(void);
106void pid_idr_init(void);
107
108static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
109{
110 return task_active_pid_ns(tsk) == &init_pid_ns;
111}
112
113#endif /* _LINUX_PID_NS_H */