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7a4e7408 EB |
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 | ||
7a4e7408 EB |
20 | typedef struct { |
21 | uid_t val; | |
22 | } kuid_t; | |
23 | ||
24 | ||
25 | typedef struct { | |
26 | gid_t val; | |
27 | } kgid_t; | |
28 | ||
29 | #define KUIDT_INIT(value) (kuid_t){ value } | |
30 | #define KGIDT_INIT(value) (kgid_t){ value } | |
31 | ||
32 | static inline uid_t __kuid_val(kuid_t uid) | |
33 | { | |
34 | return uid.val; | |
35 | } | |
36 | ||
37 | static inline gid_t __kgid_val(kgid_t gid) | |
38 | { | |
39 | return gid.val; | |
40 | } | |
41 | ||
7a4e7408 EB |
42 | #define GLOBAL_ROOT_UID KUIDT_INIT(0) |
43 | #define GLOBAL_ROOT_GID KGIDT_INIT(0) | |
44 | ||
45 | #define INVALID_UID KUIDT_INIT(-1) | |
46 | #define INVALID_GID KGIDT_INIT(-1) | |
47 | ||
48 | static inline bool uid_eq(kuid_t left, kuid_t right) | |
49 | { | |
50 | return __kuid_val(left) == __kuid_val(right); | |
51 | } | |
52 | ||
53 | static inline bool gid_eq(kgid_t left, kgid_t right) | |
54 | { | |
55 | return __kgid_val(left) == __kgid_val(right); | |
56 | } | |
57 | ||
58 | static inline bool uid_gt(kuid_t left, kuid_t right) | |
59 | { | |
60 | return __kuid_val(left) > __kuid_val(right); | |
61 | } | |
62 | ||
63 | static inline bool gid_gt(kgid_t left, kgid_t right) | |
64 | { | |
65 | return __kgid_val(left) > __kgid_val(right); | |
66 | } | |
67 | ||
68 | static inline bool uid_gte(kuid_t left, kuid_t right) | |
69 | { | |
70 | return __kuid_val(left) >= __kuid_val(right); | |
71 | } | |
72 | ||
73 | static inline bool gid_gte(kgid_t left, kgid_t right) | |
74 | { | |
75 | return __kgid_val(left) >= __kgid_val(right); | |
76 | } | |
77 | ||
78 | static inline bool uid_lt(kuid_t left, kuid_t right) | |
79 | { | |
80 | return __kuid_val(left) < __kuid_val(right); | |
81 | } | |
82 | ||
83 | static inline bool gid_lt(kgid_t left, kgid_t right) | |
84 | { | |
85 | return __kgid_val(left) < __kgid_val(right); | |
86 | } | |
87 | ||
88 | static inline bool uid_lte(kuid_t left, kuid_t right) | |
89 | { | |
90 | return __kuid_val(left) <= __kuid_val(right); | |
91 | } | |
92 | ||
93 | static inline bool gid_lte(kgid_t left, kgid_t right) | |
94 | { | |
95 | return __kgid_val(left) <= __kgid_val(right); | |
96 | } | |
97 | ||
98 | static inline bool uid_valid(kuid_t uid) | |
99 | { | |
100 | return !uid_eq(uid, INVALID_UID); | |
101 | } | |
102 | ||
103 | static inline bool gid_valid(kgid_t gid) | |
104 | { | |
105 | return !gid_eq(gid, INVALID_GID); | |
106 | } | |
107 | ||
22d917d8 EB |
108 | #ifdef CONFIG_USER_NS |
109 | ||
110 | extern kuid_t make_kuid(struct user_namespace *from, uid_t uid); | |
111 | extern kgid_t make_kgid(struct user_namespace *from, gid_t gid); | |
112 | ||
113 | extern uid_t from_kuid(struct user_namespace *to, kuid_t uid); | |
114 | extern gid_t from_kgid(struct user_namespace *to, kgid_t gid); | |
115 | extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid); | |
116 | extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid); | |
117 | ||
118 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
119 | { | |
120 | return from_kuid(ns, uid) != (uid_t) -1; | |
121 | } | |
122 | ||
123 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
124 | { | |
125 | return from_kgid(ns, gid) != (gid_t) -1; | |
126 | } | |
127 | ||
128 | #else | |
129 | ||
7a4e7408 EB |
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 | ||
22d917d8 EB |
176 | #endif /* CONFIG_USER_NS */ |
177 | ||
7a4e7408 | 178 | #endif /* _LINUX_UIDGID_H */ |