1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_USER_NAMESPACE_H
3 #define _LINUX_USER_NAMESPACE_H
5 #include <linux/kref.h>
6 #include <linux/nsproxy.h>
7 #include <linux/ns_common.h>
8 #include <linux/sched.h>
9 #include <linux/workqueue.h>
10 #include <linux/rwsem.h>
11 #include <linux/sysctl.h>
12 #include <linux/err.h>
14 #define UID_GID_MAP_MAX_EXTENTS 5
16 struct uid_gid_map { /* 64 bytes -- 1 cache line */
18 struct uid_gid_extent {
22 } extent[UID_GID_MAP_MAX_EXTENTS];
25 #define USERNS_SETGROUPS_ALLOWED 1UL
27 #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
32 UCOUNT_USER_NAMESPACES,
33 UCOUNT_PID_NAMESPACES,
34 UCOUNT_UTS_NAMESPACES,
35 UCOUNT_IPC_NAMESPACES,
36 UCOUNT_NET_NAMESPACES,
37 UCOUNT_MNT_NAMESPACES,
38 UCOUNT_CGROUP_NAMESPACES,
39 #ifdef CONFIG_INOTIFY_USER
40 UCOUNT_INOTIFY_INSTANCES,
41 UCOUNT_INOTIFY_WATCHES,
46 struct user_namespace {
47 struct uid_gid_map uid_map;
48 struct uid_gid_map gid_map;
49 struct uid_gid_map projid_map;
51 struct user_namespace *parent;
58 /* Register of per-UID persistent keyrings for this namespace */
59 #ifdef CONFIG_PERSISTENT_KEYRINGS
60 struct key *persistent_keyring_register;
61 struct rw_semaphore persistent_keyring_register_sem;
63 struct work_struct work;
65 struct ctl_table_set set;
66 struct ctl_table_header *sysctls;
68 struct ucounts *ucounts;
69 int ucount_max[UCOUNT_COUNTS];
73 struct hlist_node node;
74 struct user_namespace *ns;
77 atomic_t ucount[UCOUNT_COUNTS];
80 extern struct user_namespace init_user_ns;
82 bool setup_userns_sysctls(struct user_namespace *ns);
83 void retire_userns_sysctls(struct user_namespace *ns);
84 struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
85 void dec_ucount(struct ucounts *ucounts, enum ucount_type type);
89 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
92 atomic_inc(&ns->count);
96 extern int create_user_ns(struct cred *new);
97 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
98 extern void __put_user_ns(struct user_namespace *ns);
100 static inline void put_user_ns(struct user_namespace *ns)
102 if (ns && atomic_dec_and_test(&ns->count))
106 struct seq_operations;
107 extern const struct seq_operations proc_uid_seq_operations;
108 extern const struct seq_operations proc_gid_seq_operations;
109 extern const struct seq_operations proc_projid_seq_operations;
110 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
111 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
112 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
113 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
114 extern int proc_setgroups_show(struct seq_file *m, void *v);
115 extern bool userns_may_setgroups(const struct user_namespace *ns);
116 extern bool in_userns(const struct user_namespace *ancestor,
117 const struct user_namespace *child);
118 extern bool current_in_userns(const struct user_namespace *target_ns);
119 struct ns_common *ns_get_owner(struct ns_common *ns);
122 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
124 return &init_user_ns;
127 static inline int create_user_ns(struct cred *new)
132 static inline int unshare_userns(unsigned long unshare_flags,
133 struct cred **new_cred)
135 if (unshare_flags & CLONE_NEWUSER)
140 static inline void put_user_ns(struct user_namespace *ns)
144 static inline bool userns_may_setgroups(const struct user_namespace *ns)
149 static inline bool in_userns(const struct user_namespace *ancestor,
150 const struct user_namespace *child)
155 static inline bool current_in_userns(const struct user_namespace *target_ns)
160 static inline struct ns_common *ns_get_owner(struct ns_common *ns)
162 return ERR_PTR(-EPERM);
166 #endif /* _LINUX_USER_H */