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1: #ifndef _LINUX_UIDGID_H 2: #define _LINUX_UIDGID_H 3: 4: /* 5: * A set of types for the internal kernel types representing uids and gids. 6: * 7: * The types defined in this header allow distinguishing which uids and gids in 8: * the kernel are values used by userspace and which uid and gid 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: #include <linux/highuid.h> 16: 17: struct user_namespace; 18: extern struct user_namespace init_user_ns; 19: 20: #ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS 21: 22: typedef struct { 23: uid_t val; 24: } kuid_t; 25: 26: 27: typedef struct { 28: gid_t val; 29: } kgid_t; 30: 31: #define KUIDT_INIT(value) (kuid_t){ value } 32: #define KGIDT_INIT(value) (kgid_t){ value } 33: 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: } 43: 44: #else 45: 46: typedef uid_t kuid_t; 47: typedef gid_t kgid_t; 48: 49: static inline uid_t __kuid_val(kuid_t uid) 50: { 51: return uid; 52: } 53: 54: static inline gid_t __kgid_val(kgid_t gid) 55: { 56: return gid; 57: } 58: 59: #define KUIDT_INIT(value) ((kuid_t) value ) 60: #define KGIDT_INIT(value) ((kgid_t) value ) 61: 62: #endif 63: 64: #define GLOBAL_ROOT_UID KUIDT_INIT(0) 65: #define GLOBAL_ROOT_GID KGIDT_INIT(0) 66: 67: #define INVALID_UID KUIDT_INIT(-1) 68: #define INVALID_GID KGIDT_INIT(-1) 69: 70: static inline bool uid_eq(kuid_t left, kuid_t right) 71: { 72: return __kuid_val(left) == __kuid_val(right); 73: } 74: 75: static inline bool gid_eq(kgid_t left, kgid_t right) 76: { 77: return __kgid_val(left) == __kgid_val(right); 78: } 79: 80: static inline bool uid_gt(kuid_t left, kuid_t right) 81: { 82: return __kuid_val(left) > __kuid_val(right); 83: } 84: 85: static inline bool gid_gt(kgid_t left, kgid_t right) 86: { 87: return __kgid_val(left) > __kgid_val(right); 88: } 89: 90: static inline bool uid_gte(kuid_t left, kuid_t right) 91: { 92: return __kuid_val(left) >= __kuid_val(right); 93: } 94: 95: static inline bool gid_gte(kgid_t left, kgid_t right) 96: { 97: return __kgid_val(left) >= __kgid_val(right); 98: } 99: 100: static inline bool uid_lt(kuid_t left, kuid_t right) 101: { 102: return __kuid_val(left) < __kuid_val(right); 103: } 104: 105: static inline bool gid_lt(kgid_t left, kgid_t right) 106: { 107: return __kgid_val(left) < __kgid_val(right); 108: } 109: 110: static inline bool uid_lte(kuid_t left, kuid_t right) 111: { 112: return __kuid_val(left) <= __kuid_val(right); 113: } 114: 115: static inline bool gid_lte(kgid_t left, kgid_t right) 116: { 117: return __kgid_val(left) <= __kgid_val(right); 118: } 119: 120: static inline bool uid_valid(kuid_t uid) 121: { 122: return !uid_eq(uid, INVALID_UID); 123: } 124: 125: static inline bool gid_valid(kgid_t gid) 126: { 127: return !gid_eq(gid, INVALID_GID); 128: } 129: 130: #ifdef CONFIG_USER_NS 131: 132: extern kuid_t make_kuid(struct user_namespace *from, uid_t uid); 133: extern kgid_t make_kgid(struct user_namespace *from, gid_t gid); 134: 135: extern uid_t from_kuid(struct user_namespace *to, kuid_t uid); 136: extern gid_t from_kgid(struct user_namespace *to, kgid_t gid); 137: extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid); 138: extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid); 139: 140: static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) 141: { 142: return from_kuid(ns, uid) != (uid_t) -1; 143: } 144: 145: static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) 146: { 147: return from_kgid(ns, gid) != (gid_t) -1; 148: } 149: 150: #else 151: 152: static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid) 153: { 154: return KUIDT_INIT(uid); 155: } 156: 157: static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid) 158: { 159: return KGIDT_INIT(gid); 160: } 161: 162: static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid) 163: { 164: return __kuid_val(kuid); 165: } 166: 167: static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid) 168: { 169: return __kgid_val(kgid); 170: } 171: 172: static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid) 173: { 174: uid_t uid = from_kuid(to, kuid); 175: if (uid == (uid_t)-1) 176: uid = overflowuid; 177: return uid; 178: } 179: 180: static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid) 181: { 182: gid_t gid = from_kgid(to, kgid); 183: if (gid == (gid_t)-1) 184: gid = overflowgid; 185: return gid; 186: } 187: 188: static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid) 189: { 190: return true; 191: } 192: 193: static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid) 194: { 195: return true; 196: } 197: 198: #endif /* CONFIG_USER_NS */ 199: 200: #endif /* _LINUX_UIDGID_H */ 201: