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Linux/include/linux/projid.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_PROJID_H
  3 #define _LINUX_PROJID_H
  4 
  5 /*
  6  * A set of types for the internal kernel types representing project ids.
  7  *
  8  * The types defined in this header allow distinguishing which project ids in
  9  * the kernel are values used by userspace and which project id 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 
 17 struct user_namespace;
 18 extern struct user_namespace init_user_ns;
 19 
 20 typedef __kernel_uid32_t projid_t;
 21 
 22 typedef struct {
 23         projid_t val;
 24 } kprojid_t;
 25 
 26 static inline projid_t __kprojid_val(kprojid_t projid)
 27 {
 28         return projid.val;
 29 }
 30 
 31 #define KPROJIDT_INIT(value) (kprojid_t){ value }
 32 
 33 #define INVALID_PROJID KPROJIDT_INIT(-1)
 34 #define OVERFLOW_PROJID 65534
 35 
 36 static inline bool projid_eq(kprojid_t left, kprojid_t right)
 37 {
 38         return __kprojid_val(left) == __kprojid_val(right);
 39 }
 40 
 41 static inline bool projid_lt(kprojid_t left, kprojid_t right)
 42 {
 43         return __kprojid_val(left) < __kprojid_val(right);
 44 }
 45 
 46 static inline bool projid_valid(kprojid_t projid)
 47 {
 48         return !projid_eq(projid, INVALID_PROJID);
 49 }
 50 
 51 #ifdef CONFIG_USER_NS
 52 
 53 extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
 54 
 55 extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
 56 extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
 57 
 58 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
 59 {
 60         return from_kprojid(ns, projid) != (projid_t)-1;
 61 }
 62 
 63 #else
 64 
 65 static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
 66 {
 67         return KPROJIDT_INIT(projid);
 68 }
 69 
 70 static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
 71 {
 72         return __kprojid_val(kprojid);
 73 }
 74 
 75 static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
 76 {
 77         projid_t projid = from_kprojid(to, kprojid);
 78         if (projid == (projid_t)-1)
 79                 projid = OVERFLOW_PROJID;
 80         return projid;
 81 }
 82 
 83 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
 84 {
 85         return true;
 86 }
 87 
 88 #endif /* CONFIG_USER_NS */
 89 
 90 #endif /* _LINUX_PROJID_H */
 91 

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