1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_SCHED_USER_H 3 #define _LINUX_SCHED_USER_H 4 5 #include <linux/uidgid.h> 6 #include <linux/atomic.h> 7 #include <linux/refcount.h> 8 #include <linux/ratelimit.h> 9 10 struct key; 11 12 /* 13 * Some day this will be a full-fledged user tracking system.. 14 */ 15 struct user_struct { 16 refcount_t __count; /* reference count */ 17 atomic_t processes; /* How many processes does this user have? */ 18 atomic_t sigpending; /* How many pending signals does this user have? */ 19 #ifdef CONFIG_FANOTIFY 20 atomic_t fanotify_listeners; 21 #endif 22 #ifdef CONFIG_EPOLL 23 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 24 #endif 25 #ifdef CONFIG_POSIX_MQUEUE 26 /* protected by mq_lock */ 27 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 28 #endif 29 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 30 unsigned long unix_inflight; /* How many files in flight in unix sockets */ 31 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */ 32 33 #ifdef CONFIG_KEYS 34 /* 35 * These pointers can only change from NULL to a non-NULL value once. 36 * Writes are protected by key_user_keyring_mutex. 37 * Unlocked readers should use READ_ONCE() unless they know that 38 * install_user_keyrings() has been called successfully (which sets 39 * these members to non-NULL values, preventing further modifications). 40 */ 41 struct key *uid_keyring; /* UID specific keyring */ 42 struct key *session_keyring; /* UID's default session keyring */ 43 #endif 44 45 /* Hash table maintenance information */ 46 struct hlist_node uidhash_node; 47 kuid_t uid; 48 49 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ 50 defined(CONFIG_NET) || defined(CONFIG_IO_URING) 51 atomic_long_t locked_vm; 52 #endif 53 54 /* Miscellaneous per-user rate limit */ 55 struct ratelimit_state ratelimit; 56 }; 57 58 extern int uids_sysfs_init(void); 59 60 extern struct user_struct *find_user(kuid_t); 61 62 extern struct user_struct root_user; 63 #define INIT_USER (&root_user) 64 65 66 /* per-UID process charging. */ 67 extern struct user_struct * alloc_uid(kuid_t); 68 static inline struct user_struct *get_uid(struct user_struct *u) 69 { 70 refcount_inc(&u->__count); 71 return u; 72 } 73 extern void free_uid(struct user_struct *); 74 75 #endif /* _LINUX_SCHED_USER_H */ 76