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