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ipc/namespace.c
3.96 KB
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/* * linux/ipc/namespace.c * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc. */ #include <linux/ipc.h> #include <linux/msg.h> #include <linux/ipc_namespace.h> #include <linux/rcupdate.h> #include <linux/nsproxy.h> #include <linux/slab.h> |
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#include <linux/fs.h> #include <linux/mount.h> |
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#include <linux/user_namespace.h> |
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#include <linux/proc_ns.h> |
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#include "util.h" |
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static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns, |
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struct ipc_namespace *old_ns) |
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{ |
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struct ipc_namespace *ns; |
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int err; |
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ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL); if (ns == NULL) |
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return ERR_PTR(-ENOMEM); |
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err = ns_alloc_inum(&ns->ns); |
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if (err) { kfree(ns); return ERR_PTR(err); } |
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ns->ns.ops = &ipcns_operations; |
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atomic_set(&ns->count, 1); err = mq_init_ns(ns); if (err) { |
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ns_free_inum(&ns->ns); |
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kfree(ns); return ERR_PTR(err); } |
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atomic_inc(&nr_ipc_ns); |
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sem_init_ns(ns); msg_init_ns(ns); shm_init_ns(ns); |
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ns->user_ns = get_user_ns(user_ns); |
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return ns; |
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} |
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struct ipc_namespace *copy_ipcs(unsigned long flags, |
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struct user_namespace *user_ns, struct ipc_namespace *ns) |
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{ |
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if (!(flags & CLONE_NEWIPC)) |
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return get_ipc_ns(ns); |
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return create_ipc_ns(user_ns, ns); |
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} |
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/* * free_ipcs - free all ipcs of one type * @ns: the namespace to remove the ipcs from * @ids: the table of ipcs to free * @free: the function called to free each individual ipc * * Called for each kind of ipc when an ipc_namespace exits. */ void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, void (*free)(struct ipc_namespace *, struct kern_ipc_perm *)) { struct kern_ipc_perm *perm; int next_id; int total, in_use; |
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down_write(&ids->rwsem); |
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in_use = ids->in_use; for (total = 0, next_id = 0; total < in_use; next_id++) { perm = idr_find(&ids->ipcs_idr, next_id); if (perm == NULL) continue; |
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rcu_read_lock(); ipc_lock_object(perm); |
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free(ns, perm); total++; } |
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up_write(&ids->rwsem); |
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} |
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static void free_ipc_ns(struct ipc_namespace *ns) { |
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sem_exit_ns(ns); msg_exit_ns(ns); shm_exit_ns(ns); |
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atomic_dec(&nr_ipc_ns); |
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put_user_ns(ns->user_ns); |
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ns_free_inum(&ns->ns); |
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kfree(ns); |
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} |
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/* * put_ipc_ns - drop a reference to an ipc namespace. * @ns: the namespace to put * * If this is the last task in the namespace exiting, and * it is dropping the refcount to 0, then it can race with * a task in another ipc namespace but in a mounts namespace * which has this ipcns's mqueuefs mounted, doing some action * with one of the mqueuefs files. That can raise the refcount. * So dropping the refcount, and raising the refcount when * accessing it through the VFS, are protected with mq_lock. * * (Clearly, a task raising the refcount on its own ipc_ns * needn't take mq_lock since it can't race with the last task * in the ipcns exiting). */ void put_ipc_ns(struct ipc_namespace *ns) |
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{ |
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if (atomic_dec_and_lock(&ns->count, &mq_lock)) { mq_clear_sbinfo(ns); spin_unlock(&mq_lock); mq_put_mnt(ns); free_ipc_ns(ns); } } |
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static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns) { return container_of(ns, struct ipc_namespace, ns); } |
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static struct ns_common *ipcns_get(struct task_struct *task) |
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{ struct ipc_namespace *ns = NULL; struct nsproxy *nsproxy; |
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task_lock(task); nsproxy = task->nsproxy; |
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if (nsproxy) ns = get_ipc_ns(nsproxy->ipc_ns); |
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task_unlock(task); |
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return ns ? &ns->ns : NULL; |
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} |
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static void ipcns_put(struct ns_common *ns) |
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{ |
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return put_ipc_ns(to_ipc_ns(ns)); |
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} |
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static int ipcns_install(struct nsproxy *nsproxy, struct ns_common *new) |
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{ |
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struct ipc_namespace *ns = to_ipc_ns(new); |
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if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) || |
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!ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
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return -EPERM; |
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/* Ditch state from the old ipc namespace */ exit_sem(current); put_ipc_ns(nsproxy->ipc_ns); nsproxy->ipc_ns = get_ipc_ns(ns); return 0; } const struct proc_ns_operations ipcns_operations = { .name = "ipc", .type = CLONE_NEWIPC, .get = ipcns_get, .put = ipcns_put, .install = ipcns_install, }; |