1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef _LINUX_PROJID_H 1 #ifndef _LINUX_PROJID_H
3 #define _LINUX_PROJID_H 2 #define _LINUX_PROJID_H
4 3
5 /* 4 /*
6 * A set of types for the internal kernel type 5 * A set of types for the internal kernel types representing project ids.
7 * 6 *
8 * The types defined in this header allow dist 7 * The types defined in this header allow distinguishing which project ids in
9 * the kernel are values used by userspace and 8 * the kernel are values used by userspace and which project id values are
10 * the internal kernel values. With the addit 9 * the internal kernel values. With the addition of user namespaces the values
11 * can be different. Using the type system ma 10 * can be different. Using the type system makes it possible for the compiler
12 * to detect when we overlook these difference 11 * to detect when we overlook these differences.
13 * 12 *
14 */ 13 */
15 #include <linux/types.h> 14 #include <linux/types.h>
16 15
17 struct user_namespace; 16 struct user_namespace;
18 extern struct user_namespace init_user_ns; 17 extern struct user_namespace init_user_ns;
19 18
20 typedef __kernel_uid32_t projid_t; 19 typedef __kernel_uid32_t projid_t;
21 20
>> 21 #ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS
>> 22
22 typedef struct { 23 typedef struct {
23 projid_t val; 24 projid_t val;
24 } kprojid_t; 25 } kprojid_t;
25 26
26 static inline projid_t __kprojid_val(kprojid_t 27 static inline projid_t __kprojid_val(kprojid_t projid)
27 { 28 {
28 return projid.val; 29 return projid.val;
29 } 30 }
30 31
31 #define KPROJIDT_INIT(value) (kprojid_t){ valu 32 #define KPROJIDT_INIT(value) (kprojid_t){ value }
>> 33
>> 34 #else
>> 35
>> 36 typedef projid_t kprojid_t;
>> 37
>> 38 static inline projid_t __kprojid_val(kprojid_t projid)
>> 39 {
>> 40 return projid;
>> 41 }
>> 42
>> 43 #define KPROJIDT_INIT(value) ((kprojid_t) value )
>> 44
>> 45 #endif
32 46
33 #define INVALID_PROJID KPROJIDT_INIT(-1) 47 #define INVALID_PROJID KPROJIDT_INIT(-1)
34 #define OVERFLOW_PROJID 65534 48 #define OVERFLOW_PROJID 65534
35 49
36 static inline bool projid_eq(kprojid_t left, k 50 static inline bool projid_eq(kprojid_t left, kprojid_t right)
37 { 51 {
38 return __kprojid_val(left) == __kproji 52 return __kprojid_val(left) == __kprojid_val(right);
39 } 53 }
40 54
41 static inline bool projid_lt(kprojid_t left, k 55 static inline bool projid_lt(kprojid_t left, kprojid_t right)
42 { 56 {
43 return __kprojid_val(left) < __kprojid 57 return __kprojid_val(left) < __kprojid_val(right);
44 } 58 }
45 59
46 static inline bool projid_valid(kprojid_t proj 60 static inline bool projid_valid(kprojid_t projid)
47 { 61 {
48 return !projid_eq(projid, INVALID_PROJ 62 return !projid_eq(projid, INVALID_PROJID);
49 } 63 }
50 64
51 #ifdef CONFIG_USER_NS 65 #ifdef CONFIG_USER_NS
52 66
53 extern kprojid_t make_kprojid(struct user_name 67 extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
54 68
55 extern projid_t from_kprojid(struct user_names 69 extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
56 extern projid_t from_kprojid_munged(struct use 70 extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
57 71
58 static inline bool kprojid_has_mapping(struct 72 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
59 { 73 {
60 return from_kprojid(ns, projid) != (pr 74 return from_kprojid(ns, projid) != (projid_t)-1;
61 } 75 }
62 76
63 #else 77 #else
64 78
65 static inline kprojid_t make_kprojid(struct us 79 static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
66 { 80 {
67 return KPROJIDT_INIT(projid); 81 return KPROJIDT_INIT(projid);
68 } 82 }
69 83
70 static inline projid_t from_kprojid(struct use 84 static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
71 { 85 {
72 return __kprojid_val(kprojid); 86 return __kprojid_val(kprojid);
73 } 87 }
74 88
75 static inline projid_t from_kprojid_munged(str 89 static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
76 { 90 {
77 projid_t projid = from_kprojid(to, kpr 91 projid_t projid = from_kprojid(to, kprojid);
78 if (projid == (projid_t)-1) 92 if (projid == (projid_t)-1)
79 projid = OVERFLOW_PROJID; 93 projid = OVERFLOW_PROJID;
80 return projid; 94 return projid;
81 } 95 }
82 96
83 static inline bool kprojid_has_mapping(struct 97 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
84 { 98 {
85 return true; 99 return true;
86 } 100 }
87 101
88 #endif /* CONFIG_USER_NS */ 102 #endif /* CONFIG_USER_NS */
89 103
90 #endif /* _LINUX_PROJID_H */ 104 #endif /* _LINUX_PROJID_H */
91 105
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