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1 | #ifndef _LINUX_UIDGID_H |
2 | #define _LINUX_UIDGID_H | |
3 | ||
4 | /* | |
5 | * A set of types for the internal kernel types representing uids and gids. | |
6 | * | |
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. | |
12 | * | |
13 | */ | |
14 | #include <linux/types.h> | |
15 | #include <linux/highuid.h> | |
16 | ||
17 | struct user_namespace; | |
18 | extern struct user_namespace init_user_ns; | |
19 | ||
5673a94c | 20 | #ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS |
7a4e7408 EB |
21 | |
22 | typedef struct { | |
23 | uid_t val; | |
24 | } kuid_t; | |
25 | ||
26 | ||
27 | typedef struct { | |
28 | gid_t val; | |
29 | } kgid_t; | |
30 | ||
31 | #define KUIDT_INIT(value) (kuid_t){ value } | |
32 | #define KGIDT_INIT(value) (kgid_t){ value } | |
33 | ||
34 | static inline uid_t __kuid_val(kuid_t uid) | |
35 | { | |
36 | return uid.val; | |
37 | } | |
38 | ||
39 | static inline gid_t __kgid_val(kgid_t gid) | |
40 | { | |
41 | return gid.val; | |
42 | } | |
43 | ||
44 | #else | |
45 | ||
46 | typedef uid_t kuid_t; | |
47 | typedef gid_t kgid_t; | |
48 | ||
49 | static inline uid_t __kuid_val(kuid_t uid) | |
50 | { | |
51 | return uid; | |
52 | } | |
53 | ||
54 | static inline gid_t __kgid_val(kgid_t gid) | |
55 | { | |
56 | return gid; | |
57 | } | |
58 | ||
59 | #define KUIDT_INIT(value) ((kuid_t) value ) | |
60 | #define KGIDT_INIT(value) ((kgid_t) value ) | |
61 | ||
62 | #endif | |
63 | ||
64 | #define GLOBAL_ROOT_UID KUIDT_INIT(0) | |
65 | #define GLOBAL_ROOT_GID KGIDT_INIT(0) | |
66 | ||
67 | #define INVALID_UID KUIDT_INIT(-1) | |
68 | #define INVALID_GID KGIDT_INIT(-1) | |
69 | ||
70 | static inline bool uid_eq(kuid_t left, kuid_t right) | |
71 | { | |
72 | return __kuid_val(left) == __kuid_val(right); | |
73 | } | |
74 | ||
75 | static inline bool gid_eq(kgid_t left, kgid_t right) | |
76 | { | |
77 | return __kgid_val(left) == __kgid_val(right); | |
78 | } | |
79 | ||
80 | static inline bool uid_gt(kuid_t left, kuid_t right) | |
81 | { | |
82 | return __kuid_val(left) > __kuid_val(right); | |
83 | } | |
84 | ||
85 | static inline bool gid_gt(kgid_t left, kgid_t right) | |
86 | { | |
87 | return __kgid_val(left) > __kgid_val(right); | |
88 | } | |
89 | ||
90 | static inline bool uid_gte(kuid_t left, kuid_t right) | |
91 | { | |
92 | return __kuid_val(left) >= __kuid_val(right); | |
93 | } | |
94 | ||
95 | static inline bool gid_gte(kgid_t left, kgid_t right) | |
96 | { | |
97 | return __kgid_val(left) >= __kgid_val(right); | |
98 | } | |
99 | ||
100 | static inline bool uid_lt(kuid_t left, kuid_t right) | |
101 | { | |
102 | return __kuid_val(left) < __kuid_val(right); | |
103 | } | |
104 | ||
105 | static inline bool gid_lt(kgid_t left, kgid_t right) | |
106 | { | |
107 | return __kgid_val(left) < __kgid_val(right); | |
108 | } | |
109 | ||
110 | static inline bool uid_lte(kuid_t left, kuid_t right) | |
111 | { | |
112 | return __kuid_val(left) <= __kuid_val(right); | |
113 | } | |
114 | ||
115 | static inline bool gid_lte(kgid_t left, kgid_t right) | |
116 | { | |
117 | return __kgid_val(left) <= __kgid_val(right); | |
118 | } | |
119 | ||
120 | static inline bool uid_valid(kuid_t uid) | |
121 | { | |
122 | return !uid_eq(uid, INVALID_UID); | |
123 | } | |
124 | ||
125 | static inline bool gid_valid(kgid_t gid) | |
126 | { | |
127 | return !gid_eq(gid, INVALID_GID); | |
128 | } | |
129 | ||
130 | static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid) | |
131 | { | |
132 | return KUIDT_INIT(uid); | |
133 | } | |
134 | ||
135 | static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid) | |
136 | { | |
137 | return KGIDT_INIT(gid); | |
138 | } | |
139 | ||
140 | static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid) | |
141 | { | |
142 | return __kuid_val(kuid); | |
143 | } | |
144 | ||
145 | static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid) | |
146 | { | |
147 | return __kgid_val(kgid); | |
148 | } | |
149 | ||
150 | static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid) | |
151 | { | |
152 | uid_t uid = from_kuid(to, kuid); | |
153 | if (uid == (uid_t)-1) | |
154 | uid = overflowuid; | |
155 | return uid; | |
156 | } | |
157 | ||
158 | static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid) | |
159 | { | |
160 | gid_t gid = from_kgid(to, kgid); | |
161 | if (gid == (gid_t)-1) | |
162 | gid = overflowgid; | |
163 | return gid; | |
164 | } | |
165 | ||
166 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
167 | { | |
168 | return true; | |
169 | } | |
170 | ||
171 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
172 | { | |
173 | return true; | |
174 | } | |
175 | ||
176 | #endif /* _LINUX_UIDGID_H */ |