1 #ifndef _LINUX_UIDGID_H
2 #define _LINUX_UIDGID_H
5 * A set of types for the internal kernel types representing uids and gids.
7 * The types defined in this header allow distinguishing which uids and gids in
8 * the kernel are values used by userspace and which uid and gid values are
9 * the internal kernel values. With the addition of user namespaces the values
10 * can be different. Using the type system makes it possible for the compiler
11 * to detect when we overlook these differences.
14 #include <linux/types.h>
15 #include <linux/highuid.h>
17 struct user_namespace;
18 extern struct user_namespace init_user_ns;
29 #define KUIDT_INIT(value) (kuid_t){ value }
30 #define KGIDT_INIT(value) (kgid_t){ value }
32 #ifdef CONFIG_MULTIUSER
33 static inline uid_t __kuid_val(kuid_t uid)
38 static inline gid_t __kgid_val(kgid_t gid)
43 static inline uid_t __kuid_val(kuid_t uid)
48 static inline gid_t __kgid_val(kgid_t gid)
54 #define GLOBAL_ROOT_UID KUIDT_INIT(0)
55 #define GLOBAL_ROOT_GID KGIDT_INIT(0)
57 #define GLOBAL_SYSTEM_UID KUIDT_INIT(1000)
58 #define GLOBAL_SYSTEM_GID KGIDT_INIT(1000)
60 #define INVALID_UID KUIDT_INIT(-1)
61 #define INVALID_GID KGIDT_INIT(-1)
63 static inline bool uid_eq(kuid_t left, kuid_t right)
65 return __kuid_val(left) == __kuid_val(right);
68 static inline bool gid_eq(kgid_t left, kgid_t right)
70 return __kgid_val(left) == __kgid_val(right);
73 static inline bool uid_gt(kuid_t left, kuid_t right)
75 return __kuid_val(left) > __kuid_val(right);
78 static inline bool gid_gt(kgid_t left, kgid_t right)
80 return __kgid_val(left) > __kgid_val(right);
83 static inline bool uid_gte(kuid_t left, kuid_t right)
85 return __kuid_val(left) >= __kuid_val(right);
88 static inline bool gid_gte(kgid_t left, kgid_t right)
90 return __kgid_val(left) >= __kgid_val(right);
93 static inline bool uid_lt(kuid_t left, kuid_t right)
95 return __kuid_val(left) < __kuid_val(right);
98 static inline bool gid_lt(kgid_t left, kgid_t right)
100 return __kgid_val(left) < __kgid_val(right);
103 static inline bool uid_lte(kuid_t left, kuid_t right)
105 return __kuid_val(left) <= __kuid_val(right);
108 static inline bool gid_lte(kgid_t left, kgid_t right)
110 return __kgid_val(left) <= __kgid_val(right);
113 static inline bool uid_valid(kuid_t uid)
115 return __kuid_val(uid) != (uid_t) -1;
118 static inline bool gid_valid(kgid_t gid)
120 return __kgid_val(gid) != (gid_t) -1;
123 #ifdef CONFIG_USER_NS
125 extern kuid_t make_kuid(struct user_namespace *from, uid_t uid);
126 extern kgid_t make_kgid(struct user_namespace *from, gid_t gid);
128 extern uid_t from_kuid(struct user_namespace *to, kuid_t uid);
129 extern gid_t from_kgid(struct user_namespace *to, kgid_t gid);
130 extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid);
131 extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid);
133 static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid)
135 return from_kuid(ns, uid) != (uid_t) -1;
138 static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
140 return from_kgid(ns, gid) != (gid_t) -1;
145 static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid)
147 return KUIDT_INIT(uid);
150 static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid)
152 return KGIDT_INIT(gid);
155 static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid)
157 return __kuid_val(kuid);
160 static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid)
162 return __kgid_val(kgid);
165 static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid)
167 uid_t uid = from_kuid(to, kuid);
168 if (uid == (uid_t)-1)
173 static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid)
175 gid_t gid = from_kgid(to, kgid);
176 if (gid == (gid_t)-1)
181 static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid)
186 static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
191 #endif /* CONFIG_USER_NS */
193 #endif /* _LINUX_UIDGID_H */