| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_USER_NAMESPACE_H |
| #define _LINUX_USER_NAMESPACE_H |
| |
| #include <linux/kref.h> |
| #include <linux/nsproxy.h> |
| #include <linux/ns_common.h> |
| #include <linux/sched.h> |
| #include <linux/workqueue.h> |
| #include <linux/rwsem.h> |
| #include <linux/sysctl.h> |
| #include <linux/err.h> |
| |
| #define UID_GID_MAP_MAX_BASE_EXTENTS 5 |
| #define UID_GID_MAP_MAX_EXTENTS 340 |
| |
| struct uid_gid_extent { |
| u32 first; |
| u32 lower_first; |
| u32 count; |
| }; |
| |
| struct uid_gid_map { /* 64 bytes -- 1 cache line */ |
| u32 nr_extents; |
| union { |
| struct uid_gid_extent extent[UID_GID_MAP_MAX_BASE_EXTENTS]; |
| struct { |
| struct uid_gid_extent *forward; |
| struct uid_gid_extent *reverse; |
| }; |
| }; |
| }; |
| |
| #define USERNS_SETGROUPS_ALLOWED 1UL |
| |
| #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED |
| |
| struct ucounts; |
| |
| enum ucount_type { |
| UCOUNT_USER_NAMESPACES, |
| UCOUNT_PID_NAMESPACES, |
| UCOUNT_UTS_NAMESPACES, |
| UCOUNT_IPC_NAMESPACES, |
| UCOUNT_NET_NAMESPACES, |
| UCOUNT_MNT_NAMESPACES, |
| UCOUNT_CGROUP_NAMESPACES, |
| UCOUNT_TIME_NAMESPACES, |
| #ifdef CONFIG_INOTIFY_USER |
| UCOUNT_INOTIFY_INSTANCES, |
| UCOUNT_INOTIFY_WATCHES, |
| #endif |
| UCOUNT_COUNTS, |
| }; |
| |
| struct user_namespace { |
| struct uid_gid_map uid_map; |
| struct uid_gid_map gid_map; |
| struct uid_gid_map projid_map; |
| struct user_namespace *parent; |
| int level; |
| kuid_t owner; |
| kgid_t group; |
| struct ns_common ns; |
| unsigned long flags; |
| /* parent_could_setfcap: true if the creator if this ns had CAP_SETFCAP |
| * in its effective capability set at the child ns creation time. */ |
| bool parent_could_setfcap; |
| |
| #ifdef CONFIG_KEYS |
| /* List of joinable keyrings in this namespace. Modification access of |
| * these pointers is controlled by keyring_sem. Once |
| * user_keyring_register is set, it won't be changed, so it can be |
| * accessed directly with READ_ONCE(). |
| */ |
| struct list_head keyring_name_list; |
| struct key *user_keyring_register; |
| struct rw_semaphore keyring_sem; |
| #endif |
| |
| /* Register of per-UID persistent keyrings for this namespace */ |
| #ifdef CONFIG_PERSISTENT_KEYRINGS |
| struct key *persistent_keyring_register; |
| #endif |
| struct work_struct work; |
| #ifdef CONFIG_SYSCTL |
| struct ctl_table_set set; |
| struct ctl_table_header *sysctls; |
| #endif |
| struct ucounts *ucounts; |
| int ucount_max[UCOUNT_COUNTS]; |
| } __randomize_layout; |
| |
| struct ucounts { |
| struct hlist_node node; |
| struct user_namespace *ns; |
| kuid_t uid; |
| int count; |
| atomic_t ucount[UCOUNT_COUNTS]; |
| }; |
| |
| extern struct user_namespace init_user_ns; |
| |
| bool setup_userns_sysctls(struct user_namespace *ns); |
| void retire_userns_sysctls(struct user_namespace *ns); |
| struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type); |
| void dec_ucount(struct ucounts *ucounts, enum ucount_type type); |
| |
| #ifdef CONFIG_USER_NS |
| |
| static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |
| { |
| if (ns) |
| refcount_inc(&ns->ns.count); |
| return ns; |
| } |
| |
| extern int create_user_ns(struct cred *new); |
| extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred); |
| extern void __put_user_ns(struct user_namespace *ns); |
| |
| static inline void put_user_ns(struct user_namespace *ns) |
| { |
| if (ns && refcount_dec_and_test(&ns->ns.count)) |
| __put_user_ns(ns); |
| } |
| |
| struct seq_operations; |
| extern const struct seq_operations proc_uid_seq_operations; |
| extern const struct seq_operations proc_gid_seq_operations; |
| extern const struct seq_operations proc_projid_seq_operations; |
| extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); |
| extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); |
| extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); |
| extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *); |
| extern int proc_setgroups_show(struct seq_file *m, void *v); |
| extern bool userns_may_setgroups(const struct user_namespace *ns); |
| extern bool in_userns(const struct user_namespace *ancestor, |
| const struct user_namespace *child); |
| extern bool current_in_userns(const struct user_namespace *target_ns); |
| struct ns_common *ns_get_owner(struct ns_common *ns); |
| #else |
| |
| static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |
| { |
| return &init_user_ns; |
| } |
| |
| static inline int create_user_ns(struct cred *new) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int unshare_userns(unsigned long unshare_flags, |
| struct cred **new_cred) |
| { |
| if (unshare_flags & CLONE_NEWUSER) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static inline void put_user_ns(struct user_namespace *ns) |
| { |
| } |
| |
| static inline bool userns_may_setgroups(const struct user_namespace *ns) |
| { |
| return true; |
| } |
| |
| static inline bool in_userns(const struct user_namespace *ancestor, |
| const struct user_namespace *child) |
| { |
| return true; |
| } |
| |
| static inline bool current_in_userns(const struct user_namespace *target_ns) |
| { |
| return true; |
| } |
| |
| static inline struct ns_common *ns_get_owner(struct ns_common *ns) |
| { |
| return ERR_PTR(-EPERM); |
| } |
| #endif |
| |
| #endif /* _LINUX_USER_H */ |