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 16struct fs_pin; 17 18enum { /* definitions for pid_namespace's hide_pid field */ 19 HIDEPID_OFF = 0, 20 HIDEPID_NO_ACCESS = 1, 21 HIDEPID_INVISIBLE = 2, 22}; 23 24struct 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 50extern struct pid_namespace init_pid_ns; 51 52#define PIDNS_ADDING (1U << 31) 53 54#ifdef CONFIG_PID_NS 55static 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 62extern struct pid_namespace *copy_pid_ns(unsigned long flags, 63 struct user_namespace *user_ns, struct pid_namespace *ns); 64extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 65extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 66extern void put_pid_ns(struct pid_namespace *ns); 67 68#else /* !CONFIG_PID_NS */ 69#include <linux/err.h> 70 71static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 72{ 73 return ns; 74} 75 76static 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 84static inline void put_pid_ns(struct pid_namespace *ns) 85{ 86} 87 88static inline void zap_pid_ns_processes(struct pid_namespace *ns) 89{ 90 BUG(); 91} 92 93static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 94{ 95 return 0; 96} 97#endif /* CONFIG_PID_NS */ 98 99extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 100void pidhash_init(void); 101void pid_idr_init(void); 102 103#endif /* _LINUX_PID_NS_H */ 104