forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
168 lines
4.6 KiB
168 lines
4.6 KiB
/* 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
|
|
|