c7e12b8389
Fix two issuses related to ipc_ids->entries freeing. 1. When freeing ipc namespace we need to free entries allocated with ipc_init_ids(). 2. When removing old entries in grow_ary() ipc_rcu_putref() may be called on entries set to &ids->nullentry earlier in ipc_init_ids(). This is almost impossible without namespaces, but with them this situation becomes possible. Found during OpenVZ testing after obvious leaks in beancounters. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Cc: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
* linux/ipc/util.h
|
|
* Copyright (C) 1999 Christoph Rohland
|
|
*
|
|
* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
|
|
* namespaces support. 2006 OpenVZ, SWsoft Inc.
|
|
* Pavel Emelianov <xemul@openvz.org>
|
|
*/
|
|
|
|
#ifndef _IPC_UTIL_H
|
|
#define _IPC_UTIL_H
|
|
|
|
#define USHRT_MAX 0xffff
|
|
#define SEQ_MULTIPLIER (IPCMNI)
|
|
|
|
void sem_init (void);
|
|
void msg_init (void);
|
|
void shm_init (void);
|
|
|
|
int sem_init_ns(struct ipc_namespace *ns);
|
|
int msg_init_ns(struct ipc_namespace *ns);
|
|
int shm_init_ns(struct ipc_namespace *ns);
|
|
|
|
void sem_exit_ns(struct ipc_namespace *ns);
|
|
void msg_exit_ns(struct ipc_namespace *ns);
|
|
void shm_exit_ns(struct ipc_namespace *ns);
|
|
|
|
struct ipc_id_ary {
|
|
int size;
|
|
struct kern_ipc_perm *p[0];
|
|
};
|
|
|
|
struct ipc_ids {
|
|
int in_use;
|
|
int max_id;
|
|
unsigned short seq;
|
|
unsigned short seq_max;
|
|
struct mutex mutex;
|
|
struct ipc_id_ary nullentry;
|
|
struct ipc_id_ary* entries;
|
|
};
|
|
|
|
struct seq_file;
|
|
#ifdef CONFIG_IPC_NS
|
|
#define __ipc_init
|
|
#else
|
|
#define __ipc_init __init
|
|
#endif
|
|
void __ipc_init ipc_init_ids(struct ipc_ids *ids, int size);
|
|
#ifdef CONFIG_PROC_FS
|
|
void __init ipc_init_proc_interface(const char *path, const char *header,
|
|
int ids, int (*show)(struct seq_file *, void *));
|
|
#else
|
|
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
|
|
#endif
|
|
|
|
#define IPC_SEM_IDS 0
|
|
#define IPC_MSG_IDS 1
|
|
#define IPC_SHM_IDS 2
|
|
|
|
/* must be called with ids->mutex acquired.*/
|
|
int ipc_findkey(struct ipc_ids* ids, key_t key);
|
|
int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
|
|
|
|
/* must be called with both locks acquired. */
|
|
struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id);
|
|
|
|
int ipcperms (struct kern_ipc_perm *ipcp, short flg);
|
|
|
|
/* for rare, potentially huge allocations.
|
|
* both function can sleep
|
|
*/
|
|
void* ipc_alloc(int size);
|
|
void ipc_free(void* ptr, int size);
|
|
|
|
/*
|
|
* For allocation that need to be freed by RCU.
|
|
* Objects are reference counted, they start with reference count 1.
|
|
* getref increases the refcount, the putref call that reduces the recount
|
|
* to 0 schedules the rcu destruction. Caller must guarantee locking.
|
|
*/
|
|
void* ipc_rcu_alloc(int size);
|
|
void ipc_rcu_getref(void *ptr);
|
|
void ipc_rcu_putref(void *ptr);
|
|
|
|
static inline void __ipc_fini_ids(struct ipc_ids *ids,
|
|
struct ipc_id_ary *entries)
|
|
{
|
|
if (entries != &ids->nullentry)
|
|
ipc_rcu_putref(entries);
|
|
}
|
|
|
|
static inline void ipc_fini_ids(struct ipc_ids *ids)
|
|
{
|
|
__ipc_fini_ids(ids, ids->entries);
|
|
}
|
|
|
|
struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
|
|
struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
|
|
void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
|
|
void ipc_unlock(struct kern_ipc_perm* perm);
|
|
int ipc_buildid(struct ipc_ids* ids, int id, int seq);
|
|
int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
|
|
|
|
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
|
|
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
|
|
|
|
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
|
|
/* On IA-64, we always use the "64-bit version" of the IPC structures. */
|
|
# define ipc_parse_version(cmd) IPC_64
|
|
#else
|
|
int ipc_parse_version (int *cmd);
|
|
#endif
|
|
|
|
extern void free_msg(struct msg_msg *msg);
|
|
extern struct msg_msg *load_msg(const void __user *src, int len);
|
|
extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
|
|
|
|
#endif
|