Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * linux/ipc/util.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 1999 Christoph Rohland
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * namespaces support.      2006 OpenVZ, SWsoft Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *                               Pavel Emelianov <xemul@openvz.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #ifndef _IPC_UTIL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #define _IPC_UTIL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/ipc_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * The IPC ID contains 2 separate numbers - index and sequence number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * By default,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *   bits  0-14: index (32k, 15 bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *   bits 15-30: sequence number (64k, 16 bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * When IPCMNI extension mode is turned on, the composition changes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *   bits  0-23: index (16M, 24 bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *   bits 24-30: sequence number (128, 7 bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define IPCMNI_SHIFT		15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define IPCMNI_EXTEND_SHIFT	24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define IPCMNI_EXTEND_MIN_CYCLE	(RADIX_TREE_MAP_SIZE * RADIX_TREE_MAP_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define IPCMNI			(1 << IPCMNI_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define IPCMNI_EXTEND		(1 << IPCMNI_EXTEND_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #ifdef CONFIG_SYSVIPC_SYSCTL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) extern int ipc_mni;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) extern int ipc_mni_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) extern int ipc_min_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define ipcmni_seq_shift()	ipc_mni_shift
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define IPCMNI_IDX_MASK		((1 << ipc_mni_shift) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #else /* CONFIG_SYSVIPC_SYSCTL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define ipc_mni			IPCMNI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define ipc_min_cycle		((int)RADIX_TREE_MAP_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define ipcmni_seq_shift()	IPCMNI_SHIFT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define IPCMNI_IDX_MASK		((1 << IPCMNI_SHIFT) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #endif /* CONFIG_SYSVIPC_SYSCTL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) void sem_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) void msg_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) void shm_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct ipc_namespace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) struct pid_namespace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #ifdef CONFIG_POSIX_MQUEUE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) extern void mq_clear_sbinfo(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) extern void mq_put_mnt(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static inline void mq_put_mnt(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #ifdef CONFIG_SYSVIPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) void sem_init_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) void msg_init_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) void shm_init_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) void sem_exit_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) void msg_exit_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) void shm_exit_ns(struct ipc_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) static inline void sem_init_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static inline void msg_init_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static inline void shm_init_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static inline void sem_exit_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static inline void msg_exit_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static inline void shm_exit_ns(struct ipc_namespace *ns) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * Structure that holds the parameters needed by the ipc operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * (see after)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) struct ipc_params {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	key_t key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	int flg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		size_t size;	/* for shared memories */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		int nsems;	/* for semaphores */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	} u;			/* holds the getnew() specific param */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  * Structure that holds some ipc operations. This structure is used to unify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * the calls to sys_msgget(), sys_semget(), sys_shmget()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  *      . routine to call to create a new ipc object. Can be one of newque,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  *        newary, newseg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  *      . routine to call to check permissions for a new ipc object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  *        Can be one of security_msg_associate, security_sem_associate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  *        security_shm_associate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  *      . routine to call for an extra check if needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct ipc_ops {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	int (*getnew)(struct ipc_namespace *, struct ipc_params *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	int (*associate)(struct kern_ipc_perm *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	int (*more_checks)(struct kern_ipc_perm *, struct ipc_params *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct seq_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct ipc_ids;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) void ipc_init_ids(struct ipc_ids *ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) void __init ipc_init_proc_interface(const char *path, const char *header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		int ids, int (*show)(struct seq_file *, void *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct pid_namespace *ipc_seq_pid_ns(struct seq_file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) #define IPC_SEM_IDS	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #define IPC_MSG_IDS	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #define IPC_SHM_IDS	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) #define ipcid_to_idx(id)  ((id) & IPCMNI_IDX_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #define ipcid_to_seqx(id) ((id) >> ipcmni_seq_shift())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #define ipcid_seq_max()	  (INT_MAX >> ipcmni_seq_shift())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* must be called with ids->rwsem acquired for writing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* must be called with both locks acquired. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* must be called with both locks acquired. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) void ipc_set_key_private(struct ipc_ids *, struct kern_ipc_perm *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* must be called with ipcp locked */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * ipc_get_maxidx - get the highest assigned index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * @ids: ipc identifier set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  * Called with ipc_ids.rwsem held for reading.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static inline int ipc_get_maxidx(struct ipc_ids *ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (ids->in_use == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (ids->in_use == ipc_mni)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return ipc_mni - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	return ids->max_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * For allocation that need to be freed by RCU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * Objects are reference counted, they start with reference count 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  * getref increases the refcount, the putref call that reduces the recount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  * to 0 schedules the rcu destruction. Caller must guarantee locking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * refcount is initialized by ipc_addid(), before that point call_rcu()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  * must be used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) bool ipc_rcu_getref(struct kern_ipc_perm *ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void ipc_rcu_putref(struct kern_ipc_perm *ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			void (*func)(struct rcu_head *head));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct kern_ipc_perm *ipcctl_obtain_check(struct ipc_namespace *ns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 					     struct ipc_ids *ids, int id, int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 					     struct ipc64_perm *perm, int extra_perm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static inline void ipc_update_pid(struct pid **pos, struct pid *pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct pid *old = *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (old != pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		*pos = get_pid(pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		put_pid(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int ipc_parse_version(int *cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) extern void free_msg(struct msg_msg *msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) extern struct msg_msg *load_msg(const void __user *src, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) extern int store_msg(void __user *dest, struct msg_msg *msg, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return ipcid_to_seqx(id) != ipcp->seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static inline void ipc_lock_object(struct kern_ipc_perm *perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	spin_lock(&perm->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	spin_unlock(&perm->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	assert_spin_locked(&perm->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static inline void ipc_unlock(struct kern_ipc_perm *perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	ipc_unlock_object(perm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * ipc_valid_object() - helper to sort out IPC_RMID races for codepaths
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * where the respective ipc_ids.rwsem is not being held down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * Checks whether the ipc object is still around or if it's gone already, as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * ipc_rmid() may have already freed the ID while the ipc lock was spinning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * Needs to be called with kern_ipc_perm.lock held -- exception made for one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * checkpoint case at sys_semtimedop() as noted in code commentary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return !perm->deleted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			const struct ipc_ops *ops, struct ipc_params *params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static inline int sem_check_semmni(struct ipc_namespace *ns) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	 * Check semmni range [0, ipc_mni]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 * semmni is the last element of sem_ctls[4] array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > ipc_mni))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		? -ERANGE : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct compat_ipc_perm {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	key_t key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	__compat_uid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	__compat_gid_t gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	__compat_uid_t cuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	__compat_gid_t cgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	compat_mode_t mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	unsigned short seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) void to_compat_ipc_perm(struct compat_ipc_perm *, struct ipc64_perm *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) void to_compat_ipc64_perm(struct compat_ipc64_perm *, struct ipc64_perm *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) int get_compat_ipc_perm(struct ipc64_perm *, struct compat_ipc_perm __user *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int get_compat_ipc64_perm(struct ipc64_perm *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			  struct compat_ipc64_perm __user *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static inline int compat_ipc_parse_version(int *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	int version = *cmd & IPC_64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	*cmd &= ~IPC_64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	return version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			compat_long_t msgtyp, int msgflg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		       compat_ssize_t msgsz, int msgflg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) #endif