| #ifndef _LINUX_UIDGID_H |
| #define _LINUX_UIDGID_H |
| |
| /* |
| * A set of types for the internal kernel types representing uids and gids. |
| * |
| * The types defined in this header allow distinguishing which uids and gids in |
| * the kernel are values used by userspace and which uid and gid values are |
| * the internal kernel values. With the addition of user namespaces the values |
| * can be different. Using the type system makes it possible for the compiler |
| * to detect when we overlook these differences. |
| * |
| */ |
| #include <linux/types.h> |
| #include <linux/highuid.h> |
| |
| struct user_namespace; |
| extern struct user_namespace init_user_ns; |
| |
| typedef struct { |
| uid_t val; |
| } kuid_t; |
| |
| |
| typedef struct { |
| gid_t val; |
| } kgid_t; |
| |
| #define KUIDT_INIT(value) (kuid_t){ value } |
| #define KGIDT_INIT(value) (kgid_t){ value } |
| |
| #ifdef CONFIG_MULTIUSER |
| static inline uid_t __kuid_val(kuid_t uid) |
| { |
| return uid.val; |
| } |
| |
| static inline gid_t __kgid_val(kgid_t gid) |
| { |
| return gid.val; |
| } |
| #else |
| static inline uid_t __kuid_val(kuid_t uid) |
| { |
| return 0; |
| } |
| |
| static inline gid_t __kgid_val(kgid_t gid) |
| { |
| return 0; |
| } |
| #endif |
| |
| #define GLOBAL_ROOT_UID KUIDT_INIT(0) |
| #define GLOBAL_ROOT_GID KGIDT_INIT(0) |
| |
| #define INVALID_UID KUIDT_INIT(-1) |
| #define INVALID_GID KGIDT_INIT(-1) |
| |
| static inline bool uid_eq(kuid_t left, kuid_t right) |
| { |
| return __kuid_val(left) == __kuid_val(right); |
| } |
| |
| static inline bool gid_eq(kgid_t left, kgid_t right) |
| { |
| return __kgid_val(left) == __kgid_val(right); |
| } |
| |
| static inline bool uid_gt(kuid_t left, kuid_t right) |
| { |
| return __kuid_val(left) > __kuid_val(right); |
| } |
| |
| static inline bool gid_gt(kgid_t left, kgid_t right) |
| { |
| return __kgid_val(left) > __kgid_val(right); |
| } |
| |
| static inline bool uid_gte(kuid_t left, kuid_t right) |
| { |
| return __kuid_val(left) >= __kuid_val(right); |
| } |
| |
| static inline bool gid_gte(kgid_t left, kgid_t right) |
| { |
| return __kgid_val(left) >= __kgid_val(right); |
| } |
| |
| static inline bool uid_lt(kuid_t left, kuid_t right) |
| { |
| return __kuid_val(left) < __kuid_val(right); |
| } |
| |
| static inline bool gid_lt(kgid_t left, kgid_t right) |
| { |
| return __kgid_val(left) < __kgid_val(right); |
| } |
| |
| static inline bool uid_lte(kuid_t left, kuid_t right) |
| { |
| return __kuid_val(left) <= __kuid_val(right); |
| } |
| |
| static inline bool gid_lte(kgid_t left, kgid_t right) |
| { |
| return __kgid_val(left) <= __kgid_val(right); |
| } |
| |
| static inline bool uid_valid(kuid_t uid) |
| { |
| return __kuid_val(uid) != (uid_t) -1; |
| } |
| |
| static inline bool gid_valid(kgid_t gid) |
| { |
| return __kgid_val(gid) != (gid_t) -1; |
| } |
| |
| #ifdef CONFIG_USER_NS |
| |
| extern kuid_t make_kuid(struct user_namespace *from, uid_t uid); |
| extern kgid_t make_kgid(struct user_namespace *from, gid_t gid); |
| |
| extern uid_t from_kuid(struct user_namespace *to, kuid_t uid); |
| extern gid_t from_kgid(struct user_namespace *to, kgid_t gid); |
| extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid); |
| extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid); |
| |
| static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) |
| { |
| return from_kuid(ns, uid) != (uid_t) -1; |
| } |
| |
| static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) |
| { |
| return from_kgid(ns, gid) != (gid_t) -1; |
| } |
| |
| #else |
| |
| static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid) |
| { |
| return KUIDT_INIT(uid); |
| } |
| |
| static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid) |
| { |
| return KGIDT_INIT(gid); |
| } |
| |
| static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid) |
| { |
| return __kuid_val(kuid); |
| } |
| |
| static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid) |
| { |
| return __kgid_val(kgid); |
| } |
| |
| static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid) |
| { |
| uid_t uid = from_kuid(to, kuid); |
| if (uid == (uid_t)-1) |
| uid = overflowuid; |
| return uid; |
| } |
| |
| static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid) |
| { |
| gid_t gid = from_kgid(to, kgid); |
| if (gid == (gid_t)-1) |
| gid = overflowgid; |
| return gid; |
| } |
| |
| static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) |
| { |
| return uid_valid(uid); |
| } |
| |
| static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) |
| { |
| return gid_valid(gid); |
| } |
| |
| #endif /* CONFIG_USER_NS */ |
| |
| #endif /* _LINUX_UIDGID_H */ |