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ipc/util.c
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/* * linux/ipc/util.c * Copyright (C) 1992 Krishna Balasubramanian * * Sep 1997 - Call suser() last after "normal" permission checks so we * get BSD style process accounting right. * Occurs in several places in the IPC code. * Chris Evans, <chris@ferret.lmh.ox.ac.uk> * Nov 1999 - ipc helper functions, unified SMP locking |
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* Manfred Spraul <manfred@colorfullife.com> |
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* Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary(). * Mingming Cao <cmm@us.ibm.com> |
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* Mar 2006 - support for audit of ipc object properties * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
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* Jun 2006 - namespaces ssupport * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
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*/ |
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#include <linux/mm.h> #include <linux/shm.h> #include <linux/init.h> #include <linux/msg.h> |
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#include <linux/vmalloc.h> #include <linux/slab.h> |
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#include <linux/capability.h> |
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#include <linux/highuid.h> #include <linux/security.h> #include <linux/rcupdate.h> #include <linux/workqueue.h> |
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#include <linux/seq_file.h> #include <linux/proc_fs.h> |
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#include <linux/audit.h> |
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#include <linux/nsproxy.h> |
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#include <linux/rwsem.h> |
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#include <linux/memory.h> |
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#include <linux/ipc_namespace.h> |
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#include <asm/unistd.h> #include "util.h" |
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struct ipc_proc_iface { const char *path; const char *header; |
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int ids; |
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int (*show)(struct seq_file *, void *); }; |
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#ifdef CONFIG_MEMORY_HOTPLUG |
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static void ipc_memory_notifier(struct work_struct *work) { ipcns_notify(IPCNS_MEMCHANGED); } static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier); |
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static int ipc_memory_callback(struct notifier_block *self, unsigned long action, void *arg) { switch (action) { case MEM_ONLINE: /* memory successfully brought online */ case MEM_OFFLINE: /* or offline: it's time to recompute msgmni */ /* * This is done by invoking the ipcns notifier chain with the * IPC_MEMCHANGED event. |
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* In order not to keep the lock on the hotplug memory chain * for too long, queue a work item that will, when waken up, * activate the ipcns notification chain. * No need to keep several ipc work items on the queue. |
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*/ |
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if (!work_pending(&ipc_memory_wq)) schedule_work(&ipc_memory_wq); |
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break; case MEM_GOING_ONLINE: case MEM_GOING_OFFLINE: case MEM_CANCEL_ONLINE: case MEM_CANCEL_OFFLINE: default: break; } return NOTIFY_OK; } #endif /* CONFIG_MEMORY_HOTPLUG */ |
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/** * ipc_init - initialise IPC subsystem * * The various system5 IPC resources (semaphores, messages and shared |
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* memory) are initialised |
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* A callback routine is registered into the memory hotplug notifier * chain: since msgmni scales to lowmem this callback routine will be * called upon successful memory add / remove to recompute msmgni. |
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*/ static int __init ipc_init(void) { sem_init(); msg_init(); shm_init(); |
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hotplug_memory_notifier(ipc_memory_callback, IPC_CALLBACK_PRI); register_ipcns_notifier(&init_ipc_ns); |
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return 0; } __initcall(ipc_init); /** * ipc_init_ids - initialise IPC identifiers * @ids: Identifier set |
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* |
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* Set up the sequence range to use for the ipc identifier range (limited * below IPCMNI) then initialise the ids idr. |
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*/ |
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void ipc_init_ids(struct ipc_ids *ids) |
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{ |
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init_rwsem(&ids->rw_mutex); |
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|
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ids->in_use = 0; |
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ids->seq = 0; { int seq_limit = INT_MAX/SEQ_MULTIPLIER; |
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if (seq_limit > USHRT_MAX) ids->seq_max = USHRT_MAX; |
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else ids->seq_max = seq_limit; } |
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idr_init(&ids->ipcs_idr); |
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} |
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#ifdef CONFIG_PROC_FS |
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static const struct file_operations sysvipc_proc_fops; |
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/** |
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* ipc_init_proc_interface - Create a proc interface for sysipc types using a seq_file interface. |
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* @path: Path in procfs * @header: Banner to be printed at the beginning of the file. * @ids: ipc id table to iterate. * @show: show routine. */ void __init ipc_init_proc_interface(const char *path, const char *header, |
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int ids, int (*show)(struct seq_file *, void *)) |
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{ struct proc_dir_entry *pde; struct ipc_proc_iface *iface; iface = kmalloc(sizeof(*iface), GFP_KERNEL); if (!iface) return; iface->path = path; iface->header = header; iface->ids = ids; iface->show = show; |
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pde = proc_create_data(path, S_IRUGO, /* world readable */ NULL, /* parent dir */ &sysvipc_proc_fops, iface); if (!pde) { |
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kfree(iface); } } #endif |
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/** * ipc_findkey - find a key in an ipc identifier set * @ids: Identifier set * @key: The key to find * |
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* Requires ipc_ids.rw_mutex locked. |
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* Returns the LOCKED pointer to the ipc structure if found or NULL * if not. |
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* If key is found ipc points to the owning ipc structure |
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*/ |
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static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key) |
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{ |
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struct kern_ipc_perm *ipc; int next_id; int total; |
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|
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for (total = 0, next_id = 0; total < ids->in_use; next_id++) { ipc = idr_find(&ids->ipcs_idr, next_id); if (ipc == NULL) |
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continue; |
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if (ipc->key != key) { total++; continue; } ipc_lock_by_ptr(ipc); return ipc; |
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} |
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return NULL; |
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} |
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/** * ipc_get_maxid - get the last assigned id * @ids: IPC identifier set * |
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* Called with ipc_ids.rw_mutex held. |
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*/ |
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|
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int ipc_get_maxid(struct ipc_ids *ids) { struct kern_ipc_perm *ipc; int max_id = -1; int total, id; if (ids->in_use == 0) return -1; |
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|
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if (ids->in_use == IPCMNI) return IPCMNI - 1; /* Look for the last assigned id */ total = 0; for (id = 0; id < IPCMNI && total < ids->in_use; id++) { ipc = idr_find(&ids->ipcs_idr, id); if (ipc != NULL) { max_id = id; total++; } } return max_id; |
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} /** * ipc_addid - add an IPC identifier * @ids: IPC identifier set * @new: new IPC permission set |
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* @size: limit for the number of used ids |
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* |
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* Add an entry 'new' to the IPC ids idr. The permissions object is |
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* initialised and the first free entry is set up and the id assigned |
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* is returned. The 'new' entry is returned in a locked state on success. |
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* On failure the entry is not locked and a negative err-code is returned. |
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* |
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* Called with ipc_ids.rw_mutex held as a writer. |
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*/ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size) { |
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kuid_t euid; kgid_t egid; |
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int id, err; |
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|
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if (size > IPCMNI) size = IPCMNI; if (ids->in_use >= size) |
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return -ENOSPC; |
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|
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spin_lock_init(&new->lock); new->deleted = 0; rcu_read_lock(); spin_lock(&new->lock); |
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err = idr_get_new(&ids->ipcs_idr, new, &id); |
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if (err) { spin_unlock(&new->lock); rcu_read_unlock(); |
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return err; |
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} |
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|
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ids->in_use++; |
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|
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current_euid_egid(&euid, &egid); new->cuid = new->uid = euid; new->gid = new->cgid = egid; |
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new->seq = ids->seq++; if(ids->seq > ids->seq_max) ids->seq = 0; |
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new->id = ipc_buildid(id, new->seq); |
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return id; } /** |
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* ipcget_new - create a new ipc object * @ns: namespace |
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* @ids: IPC identifer set |
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* @ops: the actual creation routine to call * @params: its parameters * |
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* This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is IPC_PRIVATE. |
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*/ |
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static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids, |
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struct ipc_ops *ops, struct ipc_params *params) { int err; |
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retry: |
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err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL); if (!err) return -ENOMEM; |
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down_write(&ids->rw_mutex); |
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err = ops->getnew(ns, params); |
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up_write(&ids->rw_mutex); |
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|
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if (err == -EAGAIN) goto retry; |
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return err; } /** * ipc_check_perms - check security and permissions for an IPC |
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* @ns: IPC namespace |
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* @ipcp: ipc permission set |
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* @ops: the actual security routine to call * @params: its parameters |
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* * This routine is called by sys_msgget(), sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE and that key already exists in the * ids IDR. * * On success, the IPC id is returned. * |
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* It is called with ipc_ids.rw_mutex and ipcp->lock held. |
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*/ |
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static int ipc_check_perms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, struct ipc_ops *ops, struct ipc_params *params) |
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{ int err; |
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if (ipcperms(ns, ipcp, params->flg)) |
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err = -EACCES; else { err = ops->associate(ipcp, params->flg); if (!err) err = ipcp->id; } return err; } /** * ipcget_public - get an ipc object or create a new one * @ns: namespace |
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* @ids: IPC identifer set |
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* @ops: the actual creation routine to call * @params: its parameters * |
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* This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE. * It adds a new entry if the key is not found and does some permission * / security checkings if the key is found. * * On success, the ipc id is returned. |
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*/ |
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static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids, |
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struct ipc_ops *ops, struct ipc_params *params) { struct kern_ipc_perm *ipcp; int flg = params->flg; int err; |
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retry: |
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err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL); |
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/* * Take the lock as a writer since we are potentially going to add * a new entry + read locks are not "upgradable" */ down_write(&ids->rw_mutex); |
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ipcp = ipc_findkey(ids, params->key); if (ipcp == NULL) { /* key not used */ if (!(flg & IPC_CREAT)) err = -ENOENT; else if (!err) err = -ENOMEM; else err = ops->getnew(ns, params); } else { /* ipc object has been locked by ipc_findkey() */ if (flg & IPC_CREAT && flg & IPC_EXCL) err = -EEXIST; else { err = 0; if (ops->more_checks) err = ops->more_checks(ipcp, params); if (!err) |
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/* * ipc_check_perms returns the IPC id on * success */ |
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err = ipc_check_perms(ns, ipcp, ops, params); |
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} ipc_unlock(ipcp); } |
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up_write(&ids->rw_mutex); |
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|
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if (err == -EAGAIN) goto retry; |
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return err; } /** |
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* ipc_rmid - remove an IPC identifier |
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* @ids: IPC identifier set * @ipcp: ipc perm structure containing the identifier to remove |
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* |
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* ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held * before this function is called, and remain locked on the exit. |
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*/ |
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void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp) |
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{ |
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int lid = ipcid_to_idx(ipcp->id); |
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idr_remove(&ids->ipcs_idr, lid); |
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|
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ids->in_use--; |
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ipcp->deleted = 1; return; |
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} /** * ipc_alloc - allocate ipc space * @size: size desired * * Allocate memory from the appropriate pools and return a pointer to it. * NULL is returned if the allocation fails */ void* ipc_alloc(int size) { void* out; if(size > PAGE_SIZE) out = vmalloc(size); else out = kmalloc(size, GFP_KERNEL); return out; } /** * ipc_free - free ipc space * @ptr: pointer returned by ipc_alloc * @size: size of block * |
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* Free a block created with ipc_alloc(). The caller must know the size |
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* used in the allocation call. */ void ipc_free(void* ptr, int size) { if(size > PAGE_SIZE) vfree(ptr); else kfree(ptr); } /* * rcu allocations: * There are three headers that are prepended to the actual allocation: * - during use: ipc_rcu_hdr. * - during the rcu grace period: ipc_rcu_grace. * - [only if vmalloc]: ipc_rcu_sched. * Their lifetime doesn't overlap, thus the headers share the same memory. * Unlike a normal union, they are right-aligned, thus some container_of * forward/backward casting is necessary: */ struct ipc_rcu_hdr { int refcount; int is_vmalloc; void *data[0]; }; struct ipc_rcu_grace { struct rcu_head rcu; /* "void *" makes sure alignment of following data is sane. */ void *data[0]; }; struct ipc_rcu_sched { struct work_struct work; /* "void *" makes sure alignment of following data is sane. */ void *data[0]; }; #define HDRLEN_KMALLOC (sizeof(struct ipc_rcu_grace) > sizeof(struct ipc_rcu_hdr) ? \ sizeof(struct ipc_rcu_grace) : sizeof(struct ipc_rcu_hdr)) #define HDRLEN_VMALLOC (sizeof(struct ipc_rcu_sched) > HDRLEN_KMALLOC ? \ sizeof(struct ipc_rcu_sched) : HDRLEN_KMALLOC) static inline int rcu_use_vmalloc(int size) { /* Too big for a single page? */ if (HDRLEN_KMALLOC + size > PAGE_SIZE) return 1; return 0; } /** * ipc_rcu_alloc - allocate ipc and rcu space * @size: size desired * * Allocate memory for the rcu header structure + the object. * Returns the pointer to the object. * NULL is returned if the allocation fails. */ void* ipc_rcu_alloc(int size) { void* out; /* * We prepend the allocation with the rcu struct, and * workqueue if necessary (for vmalloc). */ if (rcu_use_vmalloc(size)) { out = vmalloc(HDRLEN_VMALLOC + size); if (out) { out += HDRLEN_VMALLOC; container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 1; container_of(out, struct ipc_rcu_hdr, data)->refcount = 1; } } else { out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL); if (out) { out += HDRLEN_KMALLOC; container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 0; container_of(out, struct ipc_rcu_hdr, data)->refcount = 1; } } return out; } void ipc_rcu_getref(void *ptr) { container_of(ptr, struct ipc_rcu_hdr, data)->refcount++; } |
65f27f384 WorkStruct: Pass ... |
536 537 538 539 |
static void ipc_do_vfree(struct work_struct *work) { vfree(container_of(work, struct ipc_rcu_sched, work)); } |
1da177e4c Linux-2.6.12-rc2 |
540 |
/** |
1e5d53314 [PATCH] more kern... |
541 542 |
* ipc_schedule_free - free ipc + rcu space * @head: RCU callback structure for queued work |
1da177e4c Linux-2.6.12-rc2 |
543 544 |
* * Since RCU callback function is called in bh, |
72fd4a35a [PATCH] Numerous ... |
545 |
* we need to defer the vfree to schedule_work(). |
1da177e4c Linux-2.6.12-rc2 |
546 547 548 |
*/ static void ipc_schedule_free(struct rcu_head *head) { |
f4566f048 ipc: fix wrong co... |
549 550 551 552 553 554 |
struct ipc_rcu_grace *grace; struct ipc_rcu_sched *sched; grace = container_of(head, struct ipc_rcu_grace, rcu); sched = container_of(&(grace->data[0]), struct ipc_rcu_sched, data[0]); |
1da177e4c Linux-2.6.12-rc2 |
555 |
|
65f27f384 WorkStruct: Pass ... |
556 |
INIT_WORK(&sched->work, ipc_do_vfree); |
1da177e4c Linux-2.6.12-rc2 |
557 558 |
schedule_work(&sched->work); } |
1da177e4c Linux-2.6.12-rc2 |
559 560 561 562 563 564 565 566 567 |
void ipc_rcu_putref(void *ptr) { if (--container_of(ptr, struct ipc_rcu_hdr, data)->refcount > 0) return; if (container_of(ptr, struct ipc_rcu_hdr, data)->is_vmalloc) { call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu, ipc_schedule_free); } else { |
d4ee9aa33 ipc,rcu: Convert ... |
568 |
kfree_rcu(container_of(ptr, struct ipc_rcu_grace, data), rcu); |
1da177e4c Linux-2.6.12-rc2 |
569 570 571 572 573 |
} } /** * ipcperms - check IPC permissions |
6213cfe82 ipc: fix util.c k... |
574 |
* @ns: IPC namespace |
1da177e4c Linux-2.6.12-rc2 |
575 576 577 578 579 |
* @ipcp: IPC permission set * @flag: desired permission set. * * Check user, group, other permissions for access * to ipc resources. return 0 if allowed |
b0e77598f userns: user name... |
580 581 |
* * @flag will most probably be 0 or S_...UGO from <linux/stat.h> |
1da177e4c Linux-2.6.12-rc2 |
582 583 |
*/ |
b0e77598f userns: user name... |
584 585 |
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag) { |
1efdb69b0 userns: Convert i... |
586 |
kuid_t euid = current_euid(); |
a33e67510 sanitize audit_ip... |
587 |
int requested_mode, granted_mode; |
1da177e4c Linux-2.6.12-rc2 |
588 |
|
a33e67510 sanitize audit_ip... |
589 |
audit_ipc_obj(ipcp); |
1da177e4c Linux-2.6.12-rc2 |
590 591 |
requested_mode = (flag >> 6) | (flag >> 3) | flag; granted_mode = ipcp->mode; |
1efdb69b0 userns: Convert i... |
592 593 |
if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid)) |
1da177e4c Linux-2.6.12-rc2 |
594 595 596 597 598 |
granted_mode >>= 6; else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid)) granted_mode >>= 3; /* is there some bit set in requested_mode but not in granted_mode? */ if ((requested_mode & ~granted_mode & 0007) && |
b0e77598f userns: user name... |
599 |
!ns_capable(ns->user_ns, CAP_IPC_OWNER)) |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
return -1; return security_ipc_permission(ipcp, flag); } /* * Functions to convert between the kern_ipc_perm structure and the * old/new ipc_perm structures */ /** * kernel_to_ipc64_perm - convert kernel ipc permissions to user * @in: kernel permissions * @out: new style IPC permissions * |
72fd4a35a [PATCH] Numerous ... |
615 616 |
* Turn the kernel object @in into a set of permissions descriptions * for returning to userspace (@out). |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 621 622 |
*/ void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out) { out->key = in->key; |
1efdb69b0 userns: Convert i... |
623 624 625 626 |
out->uid = from_kuid_munged(current_user_ns(), in->uid); out->gid = from_kgid_munged(current_user_ns(), in->gid); out->cuid = from_kuid_munged(current_user_ns(), in->cuid); out->cgid = from_kgid_munged(current_user_ns(), in->cgid); |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 |
out->mode = in->mode; out->seq = in->seq; } /** |
f4566f048 ipc: fix wrong co... |
632 |
* ipc64_perm_to_ipc_perm - convert new ipc permissions to old |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 |
* @in: new style IPC permissions * @out: old style IPC permissions * |
72fd4a35a [PATCH] Numerous ... |
636 637 |
* Turn the new style permissions object @in into a compatibility * object and store it into the @out pointer. |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 648 649 |
*/ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out) { out->key = in->key; SET_UID(out->uid, in->uid); SET_GID(out->gid, in->gid); SET_UID(out->cuid, in->cuid); SET_GID(out->cgid, in->cgid); out->mode = in->mode; out->seq = in->seq; } |
f4566f048 ipc: fix wrong co... |
650 |
/** |
3e148c799 fix idr_find() lo... |
651 |
* ipc_lock - Lock an ipc structure without rw_mutex held |
f4566f048 ipc: fix wrong co... |
652 653 654 655 656 |
* @ids: IPC identifier set * @id: ipc id to look for * * Look for an id in the ipc ids idr and lock the associated ipc object. * |
f4566f048 ipc: fix wrong co... |
657 658 |
* The ipc object is locked on exit. */ |
7ca7e564e ipc: store ipcs i... |
659 |
struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) |
1da177e4c Linux-2.6.12-rc2 |
660 |
{ |
7ca7e564e ipc: store ipcs i... |
661 |
struct kern_ipc_perm *out; |
ce621f5ba ipc: introduce th... |
662 |
int lid = ipcid_to_idx(id); |
1da177e4c Linux-2.6.12-rc2 |
663 664 |
rcu_read_lock(); |
7ca7e564e ipc: store ipcs i... |
665 666 |
out = idr_find(&ids->ipcs_idr, lid); if (out == NULL) { |
1da177e4c Linux-2.6.12-rc2 |
667 |
rcu_read_unlock(); |
023a53557 ipc: integrate ip... |
668 |
return ERR_PTR(-EINVAL); |
1da177e4c Linux-2.6.12-rc2 |
669 |
} |
7ca7e564e ipc: store ipcs i... |
670 |
|
1da177e4c Linux-2.6.12-rc2 |
671 672 673 674 675 676 677 678 |
spin_lock(&out->lock); /* ipc_rmid() may have already freed the ID while ipc_lock * was spinning: here verify that the structure is still valid */ if (out->deleted) { spin_unlock(&out->lock); rcu_read_unlock(); |
023a53557 ipc: integrate ip... |
679 |
return ERR_PTR(-EINVAL); |
1da177e4c Linux-2.6.12-rc2 |
680 |
} |
7ca7e564e ipc: store ipcs i... |
681 |
|
1da177e4c Linux-2.6.12-rc2 |
682 683 |
return out; } |
b2d75cddc ipc: uninline som... |
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 |
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; out = ipc_lock(ids, id); if (IS_ERR(out)) return out; if (ipc_checkid(out, id)) { ipc_unlock(out); return ERR_PTR(-EIDRM); } return out; } /** * ipcget - Common sys_*get() code * @ns : namsepace * @ids : IPC identifier set * @ops : operations to be called on ipc object creation, permission checks * and further checks * @params : the parameters needed by the previous operations. * * Common routine called by sys_msgget(), sys_semget() and sys_shmget(). */ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params) { if (params->key == IPC_PRIVATE) return ipcget_new(ns, ids, ops, params); else return ipcget_public(ns, ids, ops, params); } |
8f4a3809c IPC: introduce ip... |
718 719 720 721 722 |
/** * ipc_update_perm - update the permissions of an IPC. * @in: the permission given as input. * @out: the permission of the ipc to set. */ |
1efdb69b0 userns: Convert i... |
723 |
int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out) |
8f4a3809c IPC: introduce ip... |
724 |
{ |
1efdb69b0 userns: Convert i... |
725 726 727 728 729 730 731 |
kuid_t uid = make_kuid(current_user_ns(), in->uid); kgid_t gid = make_kgid(current_user_ns(), in->gid); if (!uid_valid(uid) || !gid_valid(gid)) return -EINVAL; out->uid = uid; out->gid = gid; |
8f4a3809c IPC: introduce ip... |
732 733 |
out->mode = (out->mode & ~S_IRWXUGO) | (in->mode & S_IRWXUGO); |
1efdb69b0 userns: Convert i... |
734 735 |
return 0; |
8f4a3809c IPC: introduce ip... |
736 |
} |
a5f75e7f2 IPC: consolidate ... |
737 738 |
/** * ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd |
6213cfe82 ipc: fix util.c k... |
739 |
* @ns: the ipc namespace |
a5f75e7f2 IPC: consolidate ... |
740 741 742 743 744 745 746 747 748 749 750 751 752 753 |
* @ids: the table of ids where to look for the ipc * @id: the id of the ipc to retrieve * @cmd: the cmd to check * @perm: the permission to set * @extra_perm: one extra permission parameter used by msq * * This function does some common audit and permissions check for some IPC_XXX * cmd and is called from semctl_down, shmctl_down and msgctl_down. * It must be called without any lock held and * - retrieves the ipc with the given id in the given table. * - performs some audit and permission check, depending on the given cmd * - returns the ipc with both ipc and rw_mutex locks held in case of success * or an err-code without any lock held otherwise. */ |
b0e77598f userns: user name... |
754 755 |
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns, struct ipc_ids *ids, int id, int cmd, |
a5f75e7f2 IPC: consolidate ... |
756 757 758 |
struct ipc64_perm *perm, int extra_perm) { struct kern_ipc_perm *ipcp; |
1efdb69b0 userns: Convert i... |
759 |
kuid_t euid; |
a5f75e7f2 IPC: consolidate ... |
760 761 762 |
int err; down_write(&ids->rw_mutex); |
00c2bf85d ipc: get rid of i... |
763 |
ipcp = ipc_lock_check(ids, id); |
a5f75e7f2 IPC: consolidate ... |
764 765 766 767 |
if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); goto out_up; } |
a33e67510 sanitize audit_ip... |
768 |
audit_ipc_obj(ipcp); |
e816f370c sanitize audit_ip... |
769 770 |
if (cmd == IPC_SET) audit_ipc_set_perm(extra_perm, perm->uid, |
a5f75e7f2 IPC: consolidate ... |
771 |
perm->gid, perm->mode); |
414c0708d CRED: Wrap task c... |
772 773 |
euid = current_euid(); |
1efdb69b0 userns: Convert i... |
774 |
if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid) || |
b0e77598f userns: user name... |
775 |
ns_capable(ns->user_ns, CAP_SYS_ADMIN)) |
a5f75e7f2 IPC: consolidate ... |
776 777 778 |
return ipcp; err = -EPERM; |
a5f75e7f2 IPC: consolidate ... |
779 780 781 782 783 |
ipc_unlock(ipcp); out_up: up_write(&ids->rw_mutex); return ERR_PTR(err); } |
c1d7e01d7 ipc: use Kconfig ... |
784 |
#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION |
1da177e4c Linux-2.6.12-rc2 |
785 786 787 788 789 790 791 |
/** * ipc_parse_version - IPC call version * @cmd: pointer to command * * Return IPC_64 for new style IPC and IPC_OLD for old style IPC. |
72fd4a35a [PATCH] Numerous ... |
792 |
* The @cmd value is turned from an encoding command and version into |
1da177e4c Linux-2.6.12-rc2 |
793 794 795 796 797 798 799 800 801 802 803 804 |
* just the command code. */ int ipc_parse_version (int *cmd) { if (*cmd & IPC_64) { *cmd ^= IPC_64; return IPC_64; } else { return IPC_OLD; } } |
c1d7e01d7 ipc: use Kconfig ... |
805 |
#endif /* CONFIG_ARCH_WANT_IPC_PARSE_VERSION */ |
ae7817745 [PATCH] ipc: add ... |
806 807 |
#ifdef CONFIG_PROC_FS |
bc1fc6d88 [PATCH] ipc: save... |
808 809 810 811 |
struct ipc_proc_iter { struct ipc_namespace *ns; struct ipc_proc_iface *iface; }; |
7ca7e564e ipc: store ipcs i... |
812 813 814 |
/* * This routine locks the ipc structure found at least at position pos. */ |
b524b9adb make ipc/util.c:s... |
815 816 |
static struct kern_ipc_perm *sysvipc_find_ipc(struct ipc_ids *ids, loff_t pos, loff_t *new_pos) |
ae7817745 [PATCH] ipc: add ... |
817 |
{ |
7ca7e564e ipc: store ipcs i... |
818 819 |
struct kern_ipc_perm *ipc; int total, id; |
73ea41302 [PATCH] IPC names... |
820 |
|
7ca7e564e ipc: store ipcs i... |
821 822 823 824 825 826 |
total = 0; for (id = 0; id < pos && total < ids->in_use; id++) { ipc = idr_find(&ids->ipcs_idr, id); if (ipc != NULL) total++; } |
ae7817745 [PATCH] ipc: add ... |
827 |
|
7ca7e564e ipc: store ipcs i... |
828 829 |
if (total >= ids->in_use) return NULL; |
ae7817745 [PATCH] ipc: add ... |
830 |
|
7ca7e564e ipc: store ipcs i... |
831 832 833 834 835 |
for ( ; pos < IPCMNI; pos++) { ipc = idr_find(&ids->ipcs_idr, pos); if (ipc != NULL) { *new_pos = pos + 1; ipc_lock_by_ptr(ipc); |
ae7817745 [PATCH] ipc: add ... |
836 837 838 839 840 841 842 |
return ipc; } } /* Out of range - return NULL to terminate iteration */ return NULL; } |
7ca7e564e ipc: store ipcs i... |
843 844 845 846 847 848 849 850 851 |
static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos) { struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; struct kern_ipc_perm *ipc = it; /* If we had an ipc id locked before, unlock it */ if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); |
ed2ddbf88 IPC: make struct ... |
852 |
return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos); |
7ca7e564e ipc: store ipcs i... |
853 |
} |
ae7817745 [PATCH] ipc: add ... |
854 |
/* |
f4566f048 ipc: fix wrong co... |
855 856 |
* File positions: pos 0 -> header, pos n -> ipc id = n - 1. * SeqFile iterator: iterator value locked ipc pointer or SEQ_TOKEN_START. |
ae7817745 [PATCH] ipc: add ... |
857 858 859 |
*/ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos) { |
bc1fc6d88 [PATCH] ipc: save... |
860 861 |
struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; |
73ea41302 [PATCH] IPC names... |
862 |
struct ipc_ids *ids; |
ed2ddbf88 IPC: make struct ... |
863 |
ids = &iter->ns->ids[iface->ids]; |
ae7817745 [PATCH] ipc: add ... |
864 865 866 867 868 |
/* * Take the lock - this will be released by the corresponding * call to stop(). */ |
3e148c799 fix idr_find() lo... |
869 |
down_read(&ids->rw_mutex); |
ae7817745 [PATCH] ipc: add ... |
870 871 872 873 874 875 876 877 878 879 |
/* pos < 0 is invalid */ if (*pos < 0) return NULL; /* pos == 0 means header */ if (*pos == 0) return SEQ_START_TOKEN; /* Find the (pos-1)th ipc */ |
7ca7e564e ipc: store ipcs i... |
880 |
return sysvipc_find_ipc(ids, *pos - 1, pos); |
ae7817745 [PATCH] ipc: add ... |
881 882 883 884 885 |
} static void sysvipc_proc_stop(struct seq_file *s, void *it) { struct kern_ipc_perm *ipc = it; |
bc1fc6d88 [PATCH] ipc: save... |
886 887 |
struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; |
73ea41302 [PATCH] IPC names... |
888 |
struct ipc_ids *ids; |
ae7817745 [PATCH] ipc: add ... |
889 |
|
f4566f048 ipc: fix wrong co... |
890 |
/* If we had a locked structure, release it */ |
ae7817745 [PATCH] ipc: add ... |
891 892 |
if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); |
ed2ddbf88 IPC: make struct ... |
893 |
ids = &iter->ns->ids[iface->ids]; |
ae7817745 [PATCH] ipc: add ... |
894 |
/* Release the lock we took in start() */ |
3e148c799 fix idr_find() lo... |
895 |
up_read(&ids->rw_mutex); |
ae7817745 [PATCH] ipc: add ... |
896 897 898 899 |
} static int sysvipc_proc_show(struct seq_file *s, void *it) { |
bc1fc6d88 [PATCH] ipc: save... |
900 901 |
struct ipc_proc_iter *iter = s->private; struct ipc_proc_iface *iface = iter->iface; |
ae7817745 [PATCH] ipc: add ... |
902 903 904 905 906 907 |
if (it == SEQ_START_TOKEN) return seq_puts(s, iface->header); return iface->show(s, it); } |
88e9d34c7 seq_file: constif... |
908 |
static const struct seq_operations sysvipc_proc_seqops = { |
ae7817745 [PATCH] ipc: add ... |
909 910 911 912 913 |
.start = sysvipc_proc_start, .stop = sysvipc_proc_stop, .next = sysvipc_proc_next, .show = sysvipc_proc_show, }; |
bc1fc6d88 [PATCH] ipc: save... |
914 915 |
static int sysvipc_proc_open(struct inode *inode, struct file *file) { |
ae7817745 [PATCH] ipc: add ... |
916 917 |
int ret; struct seq_file *seq; |
bc1fc6d88 [PATCH] ipc: save... |
918 919 920 921 922 923 |
struct ipc_proc_iter *iter; ret = -ENOMEM; iter = kmalloc(sizeof(*iter), GFP_KERNEL); if (!iter) goto out; |
ae7817745 [PATCH] ipc: add ... |
924 925 |
ret = seq_open(file, &sysvipc_proc_seqops); |
bc1fc6d88 [PATCH] ipc: save... |
926 927 928 929 930 931 932 933 934 |
if (ret) goto out_kfree; seq = file->private_data; seq->private = iter; iter->iface = PDE(inode)->data; iter->ns = get_ipc_ns(current->nsproxy->ipc_ns); out: |
ae7817745 [PATCH] ipc: add ... |
935 |
return ret; |
bc1fc6d88 [PATCH] ipc: save... |
936 937 938 939 940 941 942 943 944 945 946 |
out_kfree: kfree(iter); goto out; } static int sysvipc_proc_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; struct ipc_proc_iter *iter = seq->private; put_ipc_ns(iter->ns); return seq_release_private(inode, file); |
ae7817745 [PATCH] ipc: add ... |
947 |
} |
9a32144e9 [PATCH] mark stru... |
948 |
static const struct file_operations sysvipc_proc_fops = { |
ae7817745 [PATCH] ipc: add ... |
949 950 951 |
.open = sysvipc_proc_open, .read = seq_read, .llseek = seq_lseek, |
bc1fc6d88 [PATCH] ipc: save... |
952 |
.release = sysvipc_proc_release, |
ae7817745 [PATCH] ipc: add ... |
953 954 |
}; #endif /* CONFIG_PROC_FS */ |