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acce292c CLG |
1 | #ifndef _LINUX_USER_NAMESPACE_H |
2 | #define _LINUX_USER_NAMESPACE_H | |
3 | ||
4 | #include <linux/kref.h> | |
5 | #include <linux/nsproxy.h> | |
435d5f4b | 6 | #include <linux/ns_common.h> |
acce292c | 7 | #include <linux/sched.h> |
77ec739d | 8 | #include <linux/err.h> |
acce292c | 9 | |
22d917d8 EB |
10 | #define UID_GID_MAP_MAX_EXTENTS 5 |
11 | ||
12 | struct uid_gid_map { /* 64 bytes -- 1 cache line */ | |
13 | u32 nr_extents; | |
14 | struct uid_gid_extent { | |
15 | u32 first; | |
16 | u32 lower_first; | |
17 | u32 count; | |
18 | } extent[UID_GID_MAP_MAX_EXTENTS]; | |
19 | }; | |
20 | ||
9cc46516 EB |
21 | #define USERNS_SETGROUPS_ALLOWED 1UL |
22 | ||
23 | #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED | |
24 | ||
acce292c | 25 | struct user_namespace { |
22d917d8 EB |
26 | struct uid_gid_map uid_map; |
27 | struct uid_gid_map gid_map; | |
f76d207a | 28 | struct uid_gid_map projid_map; |
c61a2810 | 29 | atomic_t count; |
aeb3ae9d | 30 | struct user_namespace *parent; |
8742f229 | 31 | int level; |
783291e6 EB |
32 | kuid_t owner; |
33 | kgid_t group; | |
435d5f4b | 34 | struct ns_common ns; |
9cc46516 | 35 | unsigned long flags; |
f36f8c75 DH |
36 | |
37 | /* Register of per-UID persistent keyrings for this namespace */ | |
38 | #ifdef CONFIG_PERSISTENT_KEYRINGS | |
39 | struct key *persistent_keyring_register; | |
40 | struct rw_semaphore persistent_keyring_register_sem; | |
41 | #endif | |
acce292c CLG |
42 | }; |
43 | ||
44 | extern struct user_namespace init_user_ns; | |
45 | ||
46 | #ifdef CONFIG_USER_NS | |
47 | ||
48 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
49 | { | |
50 | if (ns) | |
c61a2810 | 51 | atomic_inc(&ns->count); |
acce292c CLG |
52 | return ns; |
53 | } | |
54 | ||
18b6e041 | 55 | extern int create_user_ns(struct cred *new); |
b2e0d987 | 56 | extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred); |
c61a2810 | 57 | extern void free_user_ns(struct user_namespace *ns); |
acce292c CLG |
58 | |
59 | static inline void put_user_ns(struct user_namespace *ns) | |
60 | { | |
c61a2810 EB |
61 | if (ns && atomic_dec_and_test(&ns->count)) |
62 | free_user_ns(ns); | |
acce292c CLG |
63 | } |
64 | ||
22d917d8 | 65 | struct seq_operations; |
ccf94f1b FF |
66 | extern const struct seq_operations proc_uid_seq_operations; |
67 | extern const struct seq_operations proc_gid_seq_operations; | |
68 | extern const struct seq_operations proc_projid_seq_operations; | |
22d917d8 EB |
69 | extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); |
70 | extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); | |
f76d207a | 71 | extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); |
9cc46516 EB |
72 | extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *); |
73 | extern int proc_setgroups_show(struct seq_file *m, void *v); | |
273d2c67 | 74 | extern bool userns_may_setgroups(const struct user_namespace *ns); |
acce292c CLG |
75 | #else |
76 | ||
77 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
78 | { | |
79 | return &init_user_ns; | |
80 | } | |
81 | ||
18b6e041 | 82 | static inline int create_user_ns(struct cred *new) |
acce292c | 83 | { |
18b6e041 | 84 | return -EINVAL; |
acce292c CLG |
85 | } |
86 | ||
b2e0d987 EB |
87 | static inline int unshare_userns(unsigned long unshare_flags, |
88 | struct cred **new_cred) | |
89 | { | |
90 | if (unshare_flags & CLONE_NEWUSER) | |
91 | return -EINVAL; | |
92 | return 0; | |
93 | } | |
94 | ||
acce292c CLG |
95 | static inline void put_user_ns(struct user_namespace *ns) |
96 | { | |
97 | } | |
98 | ||
273d2c67 EB |
99 | static inline bool userns_may_setgroups(const struct user_namespace *ns) |
100 | { | |
101 | return true; | |
102 | } | |
22d917d8 EB |
103 | #endif |
104 | ||
acce292c | 105 | #endif /* _LINUX_USER_H */ |