Commit | Line | Data |
---|---|---|
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 | ||
2813893f | 32 | #ifdef CONFIG_MULTIUSER |
7a4e7408 EB |
33 | static inline uid_t __kuid_val(kuid_t uid) |
34 | { | |
35 | return uid.val; | |
36 | } | |
37 | ||
38 | static inline gid_t __kgid_val(kgid_t gid) | |
39 | { | |
40 | return gid.val; | |
41 | } | |
2813893f IM |
42 | #else |
43 | static inline uid_t __kuid_val(kuid_t uid) | |
44 | { | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static inline gid_t __kgid_val(kgid_t gid) | |
49 | { | |
50 | return 0; | |
51 | } | |
52 | #endif | |
7a4e7408 | 53 | |
7a4e7408 EB |
54 | #define GLOBAL_ROOT_UID KUIDT_INIT(0) |
55 | #define GLOBAL_ROOT_GID KGIDT_INIT(0) | |
56 | ||
57 | #define INVALID_UID KUIDT_INIT(-1) | |
58 | #define INVALID_GID KGIDT_INIT(-1) | |
59 | ||
60 | static inline bool uid_eq(kuid_t left, kuid_t right) | |
61 | { | |
62 | return __kuid_val(left) == __kuid_val(right); | |
63 | } | |
64 | ||
65 | static inline bool gid_eq(kgid_t left, kgid_t right) | |
66 | { | |
67 | return __kgid_val(left) == __kgid_val(right); | |
68 | } | |
69 | ||
70 | static inline bool uid_gt(kuid_t left, kuid_t right) | |
71 | { | |
72 | return __kuid_val(left) > __kuid_val(right); | |
73 | } | |
74 | ||
75 | static inline bool gid_gt(kgid_t left, kgid_t right) | |
76 | { | |
77 | return __kgid_val(left) > __kgid_val(right); | |
78 | } | |
79 | ||
80 | static inline bool uid_gte(kuid_t left, kuid_t right) | |
81 | { | |
82 | return __kuid_val(left) >= __kuid_val(right); | |
83 | } | |
84 | ||
85 | static inline bool gid_gte(kgid_t left, kgid_t right) | |
86 | { | |
87 | return __kgid_val(left) >= __kgid_val(right); | |
88 | } | |
89 | ||
90 | static inline bool uid_lt(kuid_t left, kuid_t right) | |
91 | { | |
92 | return __kuid_val(left) < __kuid_val(right); | |
93 | } | |
94 | ||
95 | static inline bool gid_lt(kgid_t left, kgid_t right) | |
96 | { | |
97 | return __kgid_val(left) < __kgid_val(right); | |
98 | } | |
99 | ||
100 | static inline bool uid_lte(kuid_t left, kuid_t right) | |
101 | { | |
102 | return __kuid_val(left) <= __kuid_val(right); | |
103 | } | |
104 | ||
105 | static inline bool gid_lte(kgid_t left, kgid_t right) | |
106 | { | |
107 | return __kgid_val(left) <= __kgid_val(right); | |
108 | } | |
109 | ||
110 | static inline bool uid_valid(kuid_t uid) | |
111 | { | |
929aa5b2 | 112 | return __kuid_val(uid) != (uid_t) -1; |
7a4e7408 EB |
113 | } |
114 | ||
115 | static inline bool gid_valid(kgid_t gid) | |
116 | { | |
929aa5b2 | 117 | return __kgid_val(gid) != (gid_t) -1; |
7a4e7408 EB |
118 | } |
119 | ||
22d917d8 EB |
120 | #ifdef CONFIG_USER_NS |
121 | ||
122 | extern kuid_t make_kuid(struct user_namespace *from, uid_t uid); | |
123 | extern kgid_t make_kgid(struct user_namespace *from, gid_t gid); | |
124 | ||
125 | extern uid_t from_kuid(struct user_namespace *to, kuid_t uid); | |
126 | extern gid_t from_kgid(struct user_namespace *to, kgid_t gid); | |
127 | extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid); | |
128 | extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid); | |
129 | ||
130 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
131 | { | |
132 | return from_kuid(ns, uid) != (uid_t) -1; | |
133 | } | |
134 | ||
135 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
136 | { | |
137 | return from_kgid(ns, gid) != (gid_t) -1; | |
138 | } | |
139 | ||
140 | #else | |
141 | ||
7a4e7408 EB |
142 | static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid) |
143 | { | |
144 | return KUIDT_INIT(uid); | |
145 | } | |
146 | ||
147 | static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid) | |
148 | { | |
149 | return KGIDT_INIT(gid); | |
150 | } | |
151 | ||
152 | static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid) | |
153 | { | |
154 | return __kuid_val(kuid); | |
155 | } | |
156 | ||
157 | static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid) | |
158 | { | |
159 | return __kgid_val(kgid); | |
160 | } | |
161 | ||
162 | static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid) | |
163 | { | |
164 | uid_t uid = from_kuid(to, kuid); | |
165 | if (uid == (uid_t)-1) | |
166 | uid = overflowuid; | |
167 | return uid; | |
168 | } | |
169 | ||
170 | static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid) | |
171 | { | |
172 | gid_t gid = from_kgid(to, kgid); | |
173 | if (gid == (gid_t)-1) | |
174 | gid = overflowgid; | |
175 | return gid; | |
176 | } | |
177 | ||
178 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
179 | { | |
180 | return true; | |
181 | } | |
182 | ||
183 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
184 | { | |
185 | return true; | |
186 | } | |
187 | ||
22d917d8 EB |
188 | #endif /* CONFIG_USER_NS */ |
189 | ||
7a4e7408 | 190 | #endif /* _LINUX_UIDGID_H */ |