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