Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_PROJID_H
2#define _LINUX_PROJID_H
3
4/*
5 * A set of types for the internal kernel types representing project ids.
6 *
7 * The types defined in this header allow distinguishing which project ids in
8 * the kernel are values used by userspace and which project id 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
16struct user_namespace;
17extern struct user_namespace init_user_ns;
18
19typedef __kernel_uid32_t projid_t;
20
21#ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS
22
23typedef struct {
24 projid_t val;
25} kprojid_t;
26
27static inline projid_t __kprojid_val(kprojid_t projid)
28{
29 return projid.val;
30}
31
32#define KPROJIDT_INIT(value) (kprojid_t){ value }
33
34#else
35
36typedef projid_t kprojid_t;
37
38static 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
46
47#define INVALID_PROJID KPROJIDT_INIT(-1)
48#define OVERFLOW_PROJID 65534
49
50static inline bool projid_eq(kprojid_t left, kprojid_t right)
51{
52 return __kprojid_val(left) == __kprojid_val(right);
53}
54
55static inline bool projid_lt(kprojid_t left, kprojid_t right)
56{
57 return __kprojid_val(left) < __kprojid_val(right);
58}
59
60static inline bool projid_valid(kprojid_t projid)
61{
62 return !projid_eq(projid, INVALID_PROJID);
63}
64
65#ifdef CONFIG_USER_NS
66
67extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
68
69extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
70extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
71
72static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
73{
74 return from_kprojid(ns, projid) != (projid_t)-1;
75}
76
77#else
78
79static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
80{
81 return KPROJIDT_INIT(projid);
82}
83
84static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
85{
86 return __kprojid_val(kprojid);
87}
88
89static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
90{
91 projid_t projid = from_kprojid(to, kprojid);
92 if (projid == (projid_t)-1)
93 projid = OVERFLOW_PROJID;
94 return projid;
95}
96
97static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
98{
99 return true;
100}
101
102#endif /* CONFIG_USER_NS */
103
104#endif /* _LINUX_PROJID_H */