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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | #ifndef _LINUX_UIDGID_H |
3 | #define _LINUX_UIDGID_H | |
4 | ||
5 | /* | |
6 | * A set of types for the internal kernel types representing uids and gids. | |
7 | * | |
8 | * The types defined in this header allow distinguishing which uids and gids in | |
9 | * the kernel are values used by userspace and which uid and gid values are | |
10 | * the internal kernel values. With the addition of user namespaces the values | |
11 | * can be different. Using the type system makes it possible for the compiler | |
12 | * to detect when we overlook these differences. | |
13 | * | |
14 | */ | |
15 | #include <linux/types.h> | |
16 | #include <linux/highuid.h> | |
17 | ||
18 | struct user_namespace; | |
19 | extern struct user_namespace init_user_ns; | |
20 | ||
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21 | typedef struct { |
22 | uid_t val; | |
23 | } kuid_t; | |
24 | ||
25 | ||
26 | typedef struct { | |
27 | gid_t val; | |
28 | } kgid_t; | |
29 | ||
30 | #define KUIDT_INIT(value) (kuid_t){ value } | |
31 | #define KGIDT_INIT(value) (kgid_t){ value } | |
32 | ||
2813893f | 33 | #ifdef CONFIG_MULTIUSER |
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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 | } | |
2813893f IM |
43 | #else |
44 | static inline uid_t __kuid_val(kuid_t uid) | |
45 | { | |
46 | return 0; | |
47 | } | |
48 | ||
49 | static inline gid_t __kgid_val(kgid_t gid) | |
50 | { | |
51 | return 0; | |
52 | } | |
53 | #endif | |
7a4e7408 | 54 | |
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55 | #define GLOBAL_ROOT_UID KUIDT_INIT(0) |
56 | #define GLOBAL_ROOT_GID KGIDT_INIT(0) | |
57 | ||
58 | #define INVALID_UID KUIDT_INIT(-1) | |
59 | #define INVALID_GID KGIDT_INIT(-1) | |
60 | ||
61 | static inline bool uid_eq(kuid_t left, kuid_t right) | |
62 | { | |
63 | return __kuid_val(left) == __kuid_val(right); | |
64 | } | |
65 | ||
66 | static inline bool gid_eq(kgid_t left, kgid_t right) | |
67 | { | |
68 | return __kgid_val(left) == __kgid_val(right); | |
69 | } | |
70 | ||
71 | static inline bool uid_gt(kuid_t left, kuid_t right) | |
72 | { | |
73 | return __kuid_val(left) > __kuid_val(right); | |
74 | } | |
75 | ||
76 | static inline bool gid_gt(kgid_t left, kgid_t right) | |
77 | { | |
78 | return __kgid_val(left) > __kgid_val(right); | |
79 | } | |
80 | ||
81 | static inline bool uid_gte(kuid_t left, kuid_t right) | |
82 | { | |
83 | return __kuid_val(left) >= __kuid_val(right); | |
84 | } | |
85 | ||
86 | static inline bool gid_gte(kgid_t left, kgid_t right) | |
87 | { | |
88 | return __kgid_val(left) >= __kgid_val(right); | |
89 | } | |
90 | ||
91 | static inline bool uid_lt(kuid_t left, kuid_t right) | |
92 | { | |
93 | return __kuid_val(left) < __kuid_val(right); | |
94 | } | |
95 | ||
96 | static inline bool gid_lt(kgid_t left, kgid_t right) | |
97 | { | |
98 | return __kgid_val(left) < __kgid_val(right); | |
99 | } | |
100 | ||
101 | static inline bool uid_lte(kuid_t left, kuid_t right) | |
102 | { | |
103 | return __kuid_val(left) <= __kuid_val(right); | |
104 | } | |
105 | ||
106 | static inline bool gid_lte(kgid_t left, kgid_t right) | |
107 | { | |
108 | return __kgid_val(left) <= __kgid_val(right); | |
109 | } | |
110 | ||
111 | static inline bool uid_valid(kuid_t uid) | |
112 | { | |
929aa5b2 | 113 | return __kuid_val(uid) != (uid_t) -1; |
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114 | } |
115 | ||
116 | static inline bool gid_valid(kgid_t gid) | |
117 | { | |
929aa5b2 | 118 | return __kgid_val(gid) != (gid_t) -1; |
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119 | } |
120 | ||
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121 | #ifdef CONFIG_USER_NS |
122 | ||
123 | extern kuid_t make_kuid(struct user_namespace *from, uid_t uid); | |
124 | extern kgid_t make_kgid(struct user_namespace *from, gid_t gid); | |
125 | ||
126 | extern uid_t from_kuid(struct user_namespace *to, kuid_t uid); | |
127 | extern gid_t from_kgid(struct user_namespace *to, kgid_t gid); | |
128 | extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid); | |
129 | extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid); | |
130 | ||
131 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
132 | { | |
133 | return from_kuid(ns, uid) != (uid_t) -1; | |
134 | } | |
135 | ||
136 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
137 | { | |
138 | return from_kgid(ns, gid) != (gid_t) -1; | |
139 | } | |
140 | ||
141 | #else | |
142 | ||
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143 | static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid) |
144 | { | |
145 | return KUIDT_INIT(uid); | |
146 | } | |
147 | ||
148 | static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid) | |
149 | { | |
150 | return KGIDT_INIT(gid); | |
151 | } | |
152 | ||
153 | static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid) | |
154 | { | |
155 | return __kuid_val(kuid); | |
156 | } | |
157 | ||
158 | static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid) | |
159 | { | |
160 | return __kgid_val(kgid); | |
161 | } | |
162 | ||
163 | static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid) | |
164 | { | |
165 | uid_t uid = from_kuid(to, kuid); | |
166 | if (uid == (uid_t)-1) | |
167 | uid = overflowuid; | |
168 | return uid; | |
169 | } | |
170 | ||
171 | static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid) | |
172 | { | |
173 | gid_t gid = from_kgid(to, kgid); | |
174 | if (gid == (gid_t)-1) | |
175 | gid = overflowgid; | |
176 | return gid; | |
177 | } | |
178 | ||
179 | static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) | |
180 | { | |
37b11804 | 181 | return uid_valid(uid); |
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182 | } |
183 | ||
184 | static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) | |
185 | { | |
37b11804 | 186 | return gid_valid(gid); |
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187 | } |
188 | ||
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189 | #endif /* CONFIG_USER_NS */ |
190 | ||
7a4e7408 | 191 | #endif /* _LINUX_UIDGID_H */ |