| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __IPC_NAMESPACE_H__ |
| #define __IPC_NAMESPACE_H__ |
| |
| #include <linux/err.h> |
| #include <linux/idr.h> |
| #include <linux/rwsem.h> |
| #include <linux/notifier.h> |
| #include <linux/nsproxy.h> |
| #include <linux/ns_common.h> |
| #include <linux/refcount.h> |
| #include <linux/rhashtable-types.h> |
| |
| struct user_namespace; |
| |
| struct ipc_ids { |
| int in_use; |
| unsigned short seq; |
| struct rw_semaphore rwsem; |
| struct idr ipcs_idr; |
| int max_idx; |
| int last_idx; /* For wrap around detection */ |
| #ifdef CONFIG_CHECKPOINT_RESTORE |
| int next_id; |
| #endif |
| struct rhashtable key_ht; |
| }; |
| |
| struct ipc_namespace { |
| struct ipc_ids ids[3]; |
| |
| int sem_ctls[4]; |
| int used_sems; |
| |
| unsigned int msg_ctlmax; |
| unsigned int msg_ctlmnb; |
| unsigned int msg_ctlmni; |
| atomic_t msg_bytes; |
| atomic_t msg_hdrs; |
| |
| size_t shm_ctlmax; |
| size_t shm_ctlall; |
| unsigned long shm_tot; |
| int shm_ctlmni; |
| /* |
| * Defines whether IPC_RMID is forced for _all_ shm segments regardless |
| * of shmctl() |
| */ |
| int shm_rmid_forced; |
| |
| struct notifier_block ipcns_nb; |
| |
| /* The kern_mount of the mqueuefs sb. We take a ref on it */ |
| struct vfsmount *mq_mnt; |
| |
| /* # queues in this ns, protected by mq_lock */ |
| unsigned int mq_queues_count; |
| |
| /* next fields are set through sysctl */ |
| unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ |
| unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ |
| unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ |
| unsigned int mq_msg_default; |
| unsigned int mq_msgsize_default; |
| |
| /* user_ns which owns the ipc ns */ |
| struct user_namespace *user_ns; |
| struct ucounts *ucounts; |
| |
| struct llist_node mnt_llist; |
| |
| struct ns_common ns; |
| } __randomize_layout; |
| |
| extern struct ipc_namespace init_ipc_ns; |
| extern spinlock_t mq_lock; |
| |
| #ifdef CONFIG_SYSVIPC |
| extern void shm_destroy_orphaned(struct ipc_namespace *ns); |
| #else /* CONFIG_SYSVIPC */ |
| static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} |
| #endif /* CONFIG_SYSVIPC */ |
| |
| #ifdef CONFIG_POSIX_MQUEUE |
| extern int mq_init_ns(struct ipc_namespace *ns); |
| /* |
| * POSIX Message Queue default values: |
| * |
| * MIN_*: Lowest value an admin can set the maximum unprivileged limit to |
| * DFLT_*MAX: Default values for the maximum unprivileged limits |
| * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply |
| * an attribute to the open call and the queue must be created |
| * HARD_*: Highest value the maximums can be set to. These are enforced |
| * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them |
| * suitably high) |
| * |
| * POSIX Requirements: |
| * Per app minimum openable message queues - 8. This does not map well |
| * to the fact that we limit the number of queues on a per namespace |
| * basis instead of a per app basis. So, make the default high enough |
| * that no given app should have a hard time opening 8 queues. |
| * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. |
| * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, |
| * we have run into a situation where running applications in the wild |
| * require this to be at least 5MB, and preferably 10MB, so I set the |
| * value to 16MB in hopes that this user is the worst of the bunch and |
| * the new maximum will handle anyone else. I may have to revisit this |
| * in the future. |
| */ |
| #define DFLT_QUEUESMAX 256 |
| #define MIN_MSGMAX 1 |
| #define DFLT_MSG 10U |
| #define DFLT_MSGMAX 10 |
| #define HARD_MSGMAX 65536 |
| #define MIN_MSGSIZEMAX 128 |
| #define DFLT_MSGSIZE 8192U |
| #define DFLT_MSGSIZEMAX 8192 |
| #define HARD_MSGSIZEMAX (16*1024*1024) |
| #else |
| static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } |
| #endif |
| |
| #if defined(CONFIG_IPC_NS) |
| extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
| struct user_namespace *user_ns, struct ipc_namespace *ns); |
| |
| static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
| { |
| if (ns) |
| refcount_inc(&ns->ns.count); |
| return ns; |
| } |
| |
| extern void put_ipc_ns(struct ipc_namespace *ns); |
| #else |
| static inline struct ipc_namespace *copy_ipcs(unsigned long flags, |
| struct user_namespace *user_ns, struct ipc_namespace *ns) |
| { |
| if (flags & CLONE_NEWIPC) |
| return ERR_PTR(-EINVAL); |
| |
| return ns; |
| } |
| |
| static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
| { |
| return ns; |
| } |
| |
| static inline void put_ipc_ns(struct ipc_namespace *ns) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_POSIX_MQUEUE_SYSCTL |
| |
| struct ctl_table_header; |
| extern struct ctl_table_header *mq_register_sysctl_table(void); |
| |
| #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
| |
| static inline struct ctl_table_header *mq_register_sysctl_table(void) |
| { |
| return NULL; |
| } |
| |
| #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
| #endif |