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 14 struct pidmap { 15 atomic_t nr_free; 16 void *page; 17 }; 18 19 #define BITS_PER_PAGE (PAGE_SIZE * 8) 20 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) 21 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE) 22 23 struct fs_pin; 24 25 enum { /* definitions for pid_namespace's hide_pid field */ 26 HIDEPID_OFF = 0, 27 HIDEPID_NO_ACCESS = 1, 28 HIDEPID_INVISIBLE = 2, 29 }; 30 31 struct pid_namespace { 32 struct kref kref; 33 struct pidmap pidmap[PIDMAP_ENTRIES]; 34 struct rcu_head rcu; 35 int last_pid; 36 unsigned int nr_hashed; 37 struct task_struct *child_reaper; 38 struct kmem_cache *pid_cachep; 39 unsigned int level; 40 struct pid_namespace *parent; 41 #ifdef CONFIG_PROC_FS 42 struct vfsmount *proc_mnt; 43 struct dentry *proc_self; 44 struct dentry *proc_thread_self; 45 #endif 46 #ifdef CONFIG_BSD_PROCESS_ACCT 47 struct fs_pin *bacct; 48 #endif 49 struct user_namespace *user_ns; 50 struct ucounts *ucounts; 51 struct work_struct proc_work; 52 kgid_t pid_gid; 53 int hide_pid; 54 int reboot; /* group exit code if this pidns was rebooted */ 55 struct ns_common ns; 56 } __randomize_layout; 57 58 extern struct pid_namespace init_pid_ns; 59 60 #define PIDNS_HASH_ADDING (1U << 31) 61 62 #ifdef CONFIG_PID_NS 63 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 64 { 65 if (ns != &init_pid_ns) 66 kref_get(&ns->kref); 67 return ns; 68 } 69 70 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 71 struct user_namespace *user_ns, struct pid_namespace *ns); 72 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 73 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 74 extern void put_pid_ns(struct pid_namespace *ns); 75 76 #else /* !CONFIG_PID_NS */ 77 #include <linux/err.h> 78 79 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 80 { 81 return ns; 82 } 83 84 static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 85 struct user_namespace *user_ns, struct pid_namespace *ns) 86 { 87 if (flags & CLONE_NEWPID) 88 ns = ERR_PTR(-EINVAL); 89 return ns; 90 } 91 92 static inline void put_pid_ns(struct pid_namespace *ns) 93 { 94 } 95 96 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 97 { 98 BUG(); 99 } 100 101 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 102 { 103 return 0; 104 } 105 #endif /* CONFIG_PID_NS */ 106 107 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 108 void pidhash_init(void); 109 void pidmap_init(void); 110 111 #endif /* _LINUX_PID_NS_H */ 112