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ipc/mqueue.c
39 KB
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/* * POSIX message queues filesystem for Linux. * * Copyright (C) 2003,2004 Krzysztof Benedyczak (golbi@mat.uni.torun.pl) |
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* Michal Wronski (michal.wronski@gmail.com) |
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* * Spinlocks: Mohamed Abbas (abbas.mohamed@intel.com) * Lockless receive & send, fd based notify: |
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* Manfred Spraul (manfred@colorfullife.com) |
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* |
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* Audit: George Wilson (ltcgcw@us.ibm.com) * |
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* This file is released under the GPL. */ |
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#include <linux/capability.h> |
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#include <linux/init.h> #include <linux/pagemap.h> #include <linux/file.h> #include <linux/mount.h> #include <linux/namei.h> #include <linux/sysctl.h> #include <linux/poll.h> #include <linux/mqueue.h> #include <linux/msg.h> #include <linux/skbuff.h> |
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#include <linux/vmalloc.h> |
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#include <linux/netlink.h> #include <linux/syscalls.h> |
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#include <linux/audit.h> |
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#include <linux/signal.h> |
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#include <linux/mutex.h> |
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#include <linux/nsproxy.h> #include <linux/pid.h> |
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#include <linux/ipc_namespace.h> |
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#include <linux/user_namespace.h> |
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#include <linux/slab.h> |
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#include <linux/sched/wake_q.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/user.h> |
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|
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#include <net/sock.h> #include "util.h" #define MQUEUE_MAGIC 0x19800202 #define DIRENT_SIZE 20 #define FILENT_SIZE 80 #define SEND 0 #define RECV 1 #define STATE_NONE 0 |
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#define STATE_READY 1 |
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|
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struct posix_msg_tree_node { struct rb_node rb_node; struct list_head msg_list; int priority; }; |
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struct ext_wait_queue { /* queue of sleeping tasks */ struct task_struct *task; struct list_head list; struct msg_msg *msg; /* ptr of loaded message */ int state; /* one of STATE_* values */ }; struct mqueue_inode_info { spinlock_t lock; struct inode vfs_inode; wait_queue_head_t wait_q; |
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struct rb_root msg_tree; |
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struct posix_msg_tree_node *node_cache; |
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struct mq_attr attr; struct sigevent notify; |
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struct pid *notify_owner; |
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struct user_namespace *notify_user_ns; |
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struct user_struct *user; /* user who created, for accounting */ |
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struct sock *notify_sock; struct sk_buff *notify_cookie; /* for tasks waiting for free space and messages, respectively */ struct ext_wait_queue e_wait_q[2]; unsigned long qsize; /* size of queue in memory (sum of all msgs) */ }; |
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static const struct inode_operations mqueue_dir_inode_operations; |
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static const struct file_operations mqueue_file_operations; |
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static const struct super_operations mqueue_super_ops; |
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static void remove_notification(struct mqueue_inode_info *info); |
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static struct kmem_cache *mqueue_inode_cachep; |
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|
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static struct ctl_table_header *mq_sysctl_table; |
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static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode) { return container_of(inode, struct mqueue_inode_info, vfs_inode); } |
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/* * This routine should be called with the mq_lock held. */ static inline struct ipc_namespace *__get_ns_from_inode(struct inode *inode) |
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{ |
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return get_ipc_ns(inode->i_sb->s_fs_info); |
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} |
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static struct ipc_namespace *get_ns_from_inode(struct inode *inode) |
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{ |
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struct ipc_namespace *ns; spin_lock(&mq_lock); ns = __get_ns_from_inode(inode); spin_unlock(&mq_lock); return ns; |
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} |
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/* Auxiliary functions to manipulate messages' list */ static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info) { struct rb_node **p, *parent = NULL; struct posix_msg_tree_node *leaf; p = &info->msg_tree.rb_node; while (*p) { parent = *p; leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); if (likely(leaf->priority == msg->m_type)) goto insert_msg; else if (msg->m_type < leaf->priority) p = &(*p)->rb_left; else p = &(*p)->rb_right; } |
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if (info->node_cache) { leaf = info->node_cache; info->node_cache = NULL; } else { leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC); if (!leaf) return -ENOMEM; |
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INIT_LIST_HEAD(&leaf->msg_list); |
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} |
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leaf->priority = msg->m_type; rb_link_node(&leaf->rb_node, parent, p); rb_insert_color(&leaf->rb_node, &info->msg_tree); |
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insert_msg: info->attr.mq_curmsgs++; info->qsize += msg->m_ts; list_add_tail(&msg->m_list, &leaf->msg_list); return 0; } static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) { struct rb_node **p, *parent = NULL; struct posix_msg_tree_node *leaf; struct msg_msg *msg; try_again: p = &info->msg_tree.rb_node; while (*p) { parent = *p; /* * During insert, low priorities go to the left and high to the * right. On receive, we want the highest priorities first, so * walk all the way to the right. */ p = &(*p)->rb_right; } if (!parent) { if (info->attr.mq_curmsgs) { pr_warn_once("Inconsistency in POSIX message queue, " "no tree element, but supposedly messages " "should exist! "); info->attr.mq_curmsgs = 0; } return NULL; } leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
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if (unlikely(list_empty(&leaf->msg_list))) { |
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pr_warn_once("Inconsistency in POSIX message queue, " "empty leaf node but we haven't implemented " "lazy leaf delete! "); rb_erase(&leaf->rb_node, &info->msg_tree); |
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if (info->node_cache) { |
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kfree(leaf); } else { info->node_cache = leaf; } |
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goto try_again; } else { msg = list_first_entry(&leaf->msg_list, struct msg_msg, m_list); list_del(&msg->m_list); if (list_empty(&leaf->msg_list)) { rb_erase(&leaf->rb_node, &info->msg_tree); |
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if (info->node_cache) { |
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kfree(leaf); } else { info->node_cache = leaf; } |
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} } info->attr.mq_curmsgs--; info->qsize -= msg->m_ts; return msg; } |
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static struct inode *mqueue_get_inode(struct super_block *sb, |
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struct ipc_namespace *ipc_ns, umode_t mode, |
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struct mq_attr *attr) |
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{ |
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struct user_struct *u = current_user(); |
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struct inode *inode; |
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int ret = -ENOMEM; |
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inode = new_inode(sb); |
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if (!inode) goto err; inode->i_ino = get_next_ino(); inode->i_mode = mode; inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); |
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inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode); |
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if (S_ISREG(mode)) { struct mqueue_inode_info *info; |
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unsigned long mq_bytes, mq_treesize; |
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inode->i_fop = &mqueue_file_operations; inode->i_size = FILENT_SIZE; /* mqueue specific info */ info = MQUEUE_I(inode); spin_lock_init(&info->lock); init_waitqueue_head(&info->wait_q); INIT_LIST_HEAD(&info->e_wait_q[0].list); INIT_LIST_HEAD(&info->e_wait_q[1].list); info->notify_owner = NULL; |
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info->notify_user_ns = NULL; |
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info->qsize = 0; info->user = NULL; /* set when all is ok */ |
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info->msg_tree = RB_ROOT; |
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info->node_cache = NULL; |
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memset(&info->attr, 0, sizeof(info->attr)); |
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info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, ipc_ns->mq_msg_default); info->attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, ipc_ns->mq_msgsize_default); |
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if (attr) { info->attr.mq_maxmsg = attr->mq_maxmsg; info->attr.mq_msgsize = attr->mq_msgsize; } |
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/* * We used to allocate a static array of pointers and account * the size of that array as well as one msg_msg struct per * possible message into the queue size. That's no longer * accurate as the queue is now an rbtree and will grow and * shrink depending on usage patterns. We can, however, still * account one msg_msg struct per message, but the nodes are * allocated depending on priority usage, and most programs * only use one, or a handful, of priorities. However, since * this is pinned memory, we need to assume worst case, so * that means the min(mq_maxmsg, max_priorities) * struct * posix_msg_tree_node. */ |
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ret = -EINVAL; if (info->attr.mq_maxmsg <= 0 || info->attr.mq_msgsize <= 0) goto out_inode; if (capable(CAP_SYS_RESOURCE)) { if (info->attr.mq_maxmsg > HARD_MSGMAX || info->attr.mq_msgsize > HARD_MSGSIZEMAX) goto out_inode; } else { if (info->attr.mq_maxmsg > ipc_ns->mq_msg_max || info->attr.mq_msgsize > ipc_ns->mq_msgsize_max) goto out_inode; } ret = -EOVERFLOW; /* check for overflow */ if (info->attr.mq_msgsize > ULONG_MAX/info->attr.mq_maxmsg) goto out_inode; |
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mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * sizeof(struct posix_msg_tree_node); |
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mq_bytes = info->attr.mq_maxmsg * info->attr.mq_msgsize; if (mq_bytes + mq_treesize < mq_bytes) goto out_inode; mq_bytes += mq_treesize; |
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spin_lock(&mq_lock); if (u->mq_bytes + mq_bytes < u->mq_bytes || |
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u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) { |
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spin_unlock(&mq_lock); /* mqueue_evict_inode() releases info->messages */ |
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ret = -EMFILE; |
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goto out_inode; |
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} |
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u->mq_bytes += mq_bytes; spin_unlock(&mq_lock); /* all is ok */ info->user = get_uid(u); } else if (S_ISDIR(mode)) { inc_nlink(inode); /* Some things misbehave if size == 0 on a directory */ inode->i_size = 2 * DIRENT_SIZE; inode->i_op = &mqueue_dir_inode_operations; inode->i_fop = &simple_dir_operations; |
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} |
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|
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return inode; out_inode: |
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iput(inode); |
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err: |
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return ERR_PTR(ret); |
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} static int mqueue_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; |
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struct ipc_namespace *ns = sb->s_fs_info; |
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|
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sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; |
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sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; |
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sb->s_magic = MQUEUE_MAGIC; sb->s_op = &mqueue_super_ops; |
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inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); if (IS_ERR(inode)) return PTR_ERR(inode); |
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|
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sb->s_root = d_make_root(inode); if (!sb->s_root) return -ENOMEM; return 0; |
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} |
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static struct dentry *mqueue_mount(struct file_system_type *fs_type, |
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int flags, const char *dev_name, |
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void *data) |
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{ |
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struct ipc_namespace *ns; if (flags & SB_KERNMOUNT) { ns = data; data = NULL; } else { ns = current->nsproxy->ipc_ns; } return mount_ns(fs_type, flags, data, ns, ns->user_ns, mqueue_fill_super); |
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} |
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static void init_once(void *foo) |
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{ struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo; |
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inode_init_once(&p->vfs_inode); |
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} static struct inode *mqueue_alloc_inode(struct super_block *sb) { struct mqueue_inode_info *ei; |
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ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL); |
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if (!ei) return NULL; return &ei->vfs_inode; } |
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static void mqueue_i_callback(struct rcu_head *head) |
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{ |
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struct inode *inode = container_of(head, struct inode, i_rcu); |
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kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode)); } |
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static void mqueue_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, mqueue_i_callback); } |
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static void mqueue_evict_inode(struct inode *inode) |
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{ struct mqueue_inode_info *info; struct user_struct *user; |
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unsigned long mq_bytes, mq_treesize; |
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struct ipc_namespace *ipc_ns; |
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struct msg_msg *msg; |
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|
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clear_inode(inode); |
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if (S_ISDIR(inode->i_mode)) |
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return; |
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|
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ipc_ns = get_ns_from_inode(inode); |
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info = MQUEUE_I(inode); spin_lock(&info->lock); |
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while ((msg = msg_get(info)) != NULL) free_msg(msg); |
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kfree(info->node_cache); |
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spin_unlock(&info->lock); |
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/* Total amount of bytes accounted for the mqueue */ |
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mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * sizeof(struct posix_msg_tree_node); mq_bytes = mq_treesize + (info->attr.mq_maxmsg * info->attr.mq_msgsize); |
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user = info->user; if (user) { spin_lock(&mq_lock); user->mq_bytes -= mq_bytes; |
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/* * get_ns_from_inode() ensures that the * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns * to which we now hold a reference, or it is NULL. * We can't put it here under mq_lock, though. */ if (ipc_ns) ipc_ns->mq_queues_count--; |
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spin_unlock(&mq_lock); free_uid(user); } |
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if (ipc_ns) put_ipc_ns(ipc_ns); |
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} |
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static int mqueue_create_attr(struct dentry *dentry, umode_t mode, void *arg) |
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{ |
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struct inode *dir = dentry->d_parent->d_inode; |
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struct inode *inode; |
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struct mq_attr *attr = arg; |
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int error; |
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struct ipc_namespace *ipc_ns; |
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spin_lock(&mq_lock); |
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ipc_ns = __get_ns_from_inode(dir); if (!ipc_ns) { error = -EACCES; goto out_unlock; } |
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if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max && !capable(CAP_SYS_RESOURCE)) { |
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error = -ENOSPC; |
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goto out_unlock; |
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} |
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438 |
ipc_ns->mq_queues_count++; |
1da177e4c Linux-2.6.12-rc2 |
439 |
spin_unlock(&mq_lock); |
7eafd7c74 namespaces: ipc n... |
440 |
inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
d40dcdb01 ipc/mqueue.c: fix... |
441 442 |
if (IS_ERR(inode)) { error = PTR_ERR(inode); |
1da177e4c Linux-2.6.12-rc2 |
443 |
spin_lock(&mq_lock); |
614b84cf4 namespaces: mqueu... |
444 445 |
ipc_ns->mq_queues_count--; goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
446 |
} |
7eafd7c74 namespaces: ipc n... |
447 |
put_ipc_ns(ipc_ns); |
1da177e4c Linux-2.6.12-rc2 |
448 |
dir->i_size += DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
449 |
dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
450 451 452 453 |
d_instantiate(dentry, inode); dget(dentry); return 0; |
614b84cf4 namespaces: mqueu... |
454 |
out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
455 |
spin_unlock(&mq_lock); |
7eafd7c74 namespaces: ipc n... |
456 457 |
if (ipc_ns) put_ipc_ns(ipc_ns); |
1da177e4c Linux-2.6.12-rc2 |
458 459 |
return error; } |
eecec19d9 mqueue: switch to... |
460 461 462 463 464 |
static int mqueue_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { return mqueue_create_attr(dentry, mode, NULL); } |
1da177e4c Linux-2.6.12-rc2 |
465 466 |
static int mqueue_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
467 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
468 |
|
078cd8279 fs: Replace CURRE... |
469 |
dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
470 |
dir->i_size -= DIRENT_SIZE; |
239521f31 ipc: whitespace c... |
471 472 473 |
drop_nlink(inode); dput(dentry); return 0; |
1da177e4c Linux-2.6.12-rc2 |
474 475 476 477 478 479 480 481 482 483 |
} /* * This is routine for system read from queue file. * To avoid mess with doing here some sort of mq_receive we allow * to read only queue size & notification info (the only values * that are interesting from user point of view and aren't accessible * through std routines) */ static ssize_t mqueue_read_file(struct file *filp, char __user *u_data, |
f1a43f93f ipc: use simple_r... |
484 |
size_t count, loff_t *off) |
1da177e4c Linux-2.6.12-rc2 |
485 |
{ |
496ad9aa8 new helper: file_... |
486 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
487 |
char buffer[FILENT_SIZE]; |
f1a43f93f ipc: use simple_r... |
488 |
ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 493 494 495 496 497 498 |
spin_lock(&info->lock); snprintf(buffer, sizeof(buffer), "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d ", info->qsize, info->notify_owner ? info->notify.sigev_notify : 0, (info->notify_owner && info->notify.sigev_notify == SIGEV_SIGNAL) ? info->notify.sigev_signo : 0, |
6c5f3e7b4 Pidns: make full ... |
499 |
pid_vnr(info->notify_owner)); |
1da177e4c Linux-2.6.12-rc2 |
500 501 |
spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; |
1da177e4c Linux-2.6.12-rc2 |
502 |
|
f1a43f93f ipc: use simple_r... |
503 504 505 506 |
ret = simple_read_from_buffer(u_data, count, off, buffer, strlen(buffer)); if (ret <= 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
507 |
|
078cd8279 fs: Replace CURRE... |
508 |
file_inode(filp)->i_atime = file_inode(filp)->i_ctime = current_time(file_inode(filp)); |
f1a43f93f ipc: use simple_r... |
509 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
510 |
} |
75e1fcc0b [PATCH] vfs: add ... |
511 |
static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
1da177e4c Linux-2.6.12-rc2 |
512 |
{ |
496ad9aa8 new helper: file_... |
513 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
514 515 |
spin_lock(&info->lock); |
a03fcb730 [PATCH] update mq... |
516 |
if (task_tgid(current) == info->notify_owner) |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 520 521 |
remove_notification(info); spin_unlock(&info->lock); return 0; } |
9dd957485 ipc, kernel, mm: ... |
522 |
static __poll_t mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) |
1da177e4c Linux-2.6.12-rc2 |
523 |
{ |
496ad9aa8 new helper: file_... |
524 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
9dd957485 ipc, kernel, mm: ... |
525 |
__poll_t retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
526 527 528 529 530 |
poll_wait(filp, &info->wait_q, poll_tab); spin_lock(&info->lock); if (info->attr.mq_curmsgs) |
a9a08845e vfs: do bulk POLL... |
531 |
retval = EPOLLIN | EPOLLRDNORM; |
1da177e4c Linux-2.6.12-rc2 |
532 533 |
if (info->attr.mq_curmsgs < info->attr.mq_maxmsg) |
a9a08845e vfs: do bulk POLL... |
534 |
retval |= EPOLLOUT | EPOLLWRNORM; |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 538 539 540 541 542 543 544 545 546 547 548 |
spin_unlock(&info->lock); return retval; } /* Adds current to info->e_wait_q[sr] before element with smaller prio */ static void wq_add(struct mqueue_inode_info *info, int sr, struct ext_wait_queue *ewp) { struct ext_wait_queue *walk; ewp->task = current; list_for_each_entry(walk, &info->e_wait_q[sr].list, list) { |
68e34f4e8 ipc/mqueue.c: hav... |
549 |
if (walk->task->prio <= current->prio) { |
1da177e4c Linux-2.6.12-rc2 |
550 551 552 553 554 555 556 557 558 559 560 561 562 |
list_add_tail(&ewp->list, &walk->list); return; } } list_add_tail(&ewp->list, &info->e_wait_q[sr].list); } /* * Puts current task to sleep. Caller must hold queue lock. After return * lock isn't held. * sr: SEND or RECV */ static int wq_sleep(struct mqueue_inode_info *info, int sr, |
9ca7d8e68 mqueue: Convert m... |
563 |
ktime_t *timeout, struct ext_wait_queue *ewp) |
eac0b1c36 ipc/mqueue: add m... |
564 |
__releases(&info->lock) |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 568 569 570 571 |
{ int retval; signed long time; wq_add(info, sr, ewp); for (;;) { |
fa6004ad4 ipc/mqueue: Imple... |
572 |
__set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
573 574 |
spin_unlock(&info->lock); |
32ea845d5 ipc/mqueue.c: fix... |
575 576 |
time = schedule_hrtimeout_range_clock(timeout, 0, HRTIMER_MODE_ABS, CLOCK_REALTIME); |
1da177e4c Linux-2.6.12-rc2 |
577 |
|
1da177e4c Linux-2.6.12-rc2 |
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 |
if (ewp->state == STATE_READY) { retval = 0; goto out; } spin_lock(&info->lock); if (ewp->state == STATE_READY) { retval = 0; goto out_unlock; } if (signal_pending(current)) { retval = -ERESTARTSYS; break; } if (time == 0) { retval = -ETIMEDOUT; break; } } list_del(&ewp->list); out_unlock: spin_unlock(&info->lock); out: return retval; } /* * Returns waiting task that should be serviced first or NULL if none exists */ static struct ext_wait_queue *wq_get_first_waiter( struct mqueue_inode_info *info, int sr) { struct list_head *ptr; ptr = info->e_wait_q[sr].list.prev; if (ptr == &info->e_wait_q[sr].list) return NULL; return list_entry(ptr, struct ext_wait_queue, list); } |
1da177e4c Linux-2.6.12-rc2 |
616 617 618 |
static inline void set_cookie(struct sk_buff *skb, char code) { |
239521f31 ipc: whitespace c... |
619 |
((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
1da177e4c Linux-2.6.12-rc2 |
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 |
} /* * The next function is only to split too long sys_mq_timedsend */ static void __do_notify(struct mqueue_inode_info *info) { /* notification * invoked when there is registered process and there isn't process * waiting synchronously for message AND state of queue changed from * empty to not empty. Here we are sure that no one is waiting * synchronously. */ if (info->notify_owner && info->attr.mq_curmsgs == 1) { struct siginfo sig_i; switch (info->notify.sigev_notify) { case SIGEV_NONE: break; case SIGEV_SIGNAL: /* sends signal */ |
faf1f22b6 signal: Ensure ge... |
640 |
clear_siginfo(&sig_i); |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 644 |
sig_i.si_signo = info->notify.sigev_signo; sig_i.si_errno = 0; sig_i.si_code = SI_MESGQ; sig_i.si_value = info->notify.sigev_value; |
6b550f949 user namespace: m... |
645 646 |
/* map current pid/uid into info->owner's namespaces */ rcu_read_lock(); |
a6684999f mqueue: fix si_pi... |
647 648 |
sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); |
76b6db010 userns: Replace u... |
649 |
sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid()); |
6b550f949 user namespace: m... |
650 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
651 |
|
a03fcb730 [PATCH] update mq... |
652 653 |
kill_pid_info(info->notify.sigev_signo, &sig_i, info->notify_owner); |
1da177e4c Linux-2.6.12-rc2 |
654 655 656 |
break; case SIGEV_THREAD: set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
7ee015e0f [NET]: cleanup 3r... |
657 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
658 659 660 |
break; } /* after notification unregisters process */ |
a03fcb730 [PATCH] update mq... |
661 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
662 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
663 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
664 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
665 666 667 |
} wake_up(&info->wait_q); } |
21fc538d8 y2038: ipc: Use _... |
668 |
static int prepare_timeout(const struct __kernel_timespec __user *u_abs_timeout, |
b90477263 ipc: mqueue: Repl... |
669 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
670 |
{ |
b90477263 ipc: mqueue: Repl... |
671 |
if (get_timespec64(ts, u_abs_timeout)) |
9ca7d8e68 mqueue: Convert m... |
672 |
return -EFAULT; |
b90477263 ipc: mqueue: Repl... |
673 |
if (!timespec64_valid(ts)) |
9ca7d8e68 mqueue: Convert m... |
674 |
return -EINVAL; |
9ca7d8e68 mqueue: Convert m... |
675 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
676 677 678 679 |
} static void remove_notification(struct mqueue_inode_info *info) { |
a03fcb730 [PATCH] update mq... |
680 |
if (info->notify_owner != NULL && |
1da177e4c Linux-2.6.12-rc2 |
681 682 |
info->notify.sigev_notify == SIGEV_THREAD) { set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
7ee015e0f [NET]: cleanup 3r... |
683 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
684 |
} |
a03fcb730 [PATCH] update mq... |
685 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
686 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
687 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
688 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
689 |
} |
066cc813e do_mq_open(): mov... |
690 691 |
static int prepare_open(struct dentry *dentry, int oflag, int ro, umode_t mode, struct filename *name, |
614b84cf4 namespaces: mqueu... |
692 |
struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
693 |
{ |
745ca2475 CRED: Pass creden... |
694 695 |
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, MAY_READ | MAY_WRITE }; |
765927b2d switch dentry_ope... |
696 |
int acc; |
066cc813e do_mq_open(): mov... |
697 |
|
9b20d7fc5 mqueue: clean pre... |
698 699 |
if (d_really_is_negative(dentry)) { if (!(oflag & O_CREAT)) |
066cc813e do_mq_open(): mov... |
700 |
return -ENOENT; |
9b20d7fc5 mqueue: clean pre... |
701 702 703 704 705 |
if (ro) return ro; audit_inode_parent_hidden(name, dentry->d_parent); return vfs_mkobj(dentry, mode & ~current_umask(), mqueue_create_attr, attr); |
066cc813e do_mq_open(): mov... |
706 |
} |
9b20d7fc5 mqueue: clean pre... |
707 708 709 710 |
/* it already existed */ audit_inode(name, dentry, 0); if ((oflag & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) return -EEXIST; |
765927b2d switch dentry_ope... |
711 |
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) |
af4a5372e move dentry_open(... |
712 |
return -EINVAL; |
765927b2d switch dentry_ope... |
713 |
acc = oflag2acc[oflag & O_ACCMODE]; |
066cc813e do_mq_open(): mov... |
714 |
return inode_permission(d_inode(dentry), acc); |
1da177e4c Linux-2.6.12-rc2 |
715 |
} |
0d0606060 mqueue: move comp... |
716 717 |
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
718 |
{ |
cfb2f6f6e Revert "mqueue: s... |
719 720 |
struct vfsmount *mnt = current->nsproxy->ipc_ns->mq_mnt; struct dentry *root = mnt->mnt_root; |
91a27b2a7 vfs: define struc... |
721 |
struct filename *name; |
a713fd7f5 tidy do_mq_open()... |
722 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
723 |
int fd, error; |
312b90fbe mqueue: lift mnt_... |
724 |
int ro; |
1da177e4c Linux-2.6.12-rc2 |
725 |
|
0d0606060 mqueue: move comp... |
726 |
audit_mq_open(oflag, mode, attr); |
20ca73bc7 [PATCH] Audit of ... |
727 |
|
1da177e4c Linux-2.6.12-rc2 |
728 729 |
if (IS_ERR(name = getname(u_name))) return PTR_ERR(name); |
269f21344 tiny mq_open opti... |
730 |
fd = get_unused_fd_flags(O_CLOEXEC); |
1da177e4c Linux-2.6.12-rc2 |
731 732 |
if (fd < 0) goto out_putname; |
312b90fbe mqueue: lift mnt_... |
733 |
ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
5955102c9 wrappers for ->i_... |
734 |
inode_lock(d_inode(root)); |
91a27b2a7 vfs: define struc... |
735 |
path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
765927b2d switch dentry_ope... |
736 737 |
if (IS_ERR(path.dentry)) { error = PTR_ERR(path.dentry); |
4294a8eed mqueue: fix mq_op... |
738 |
goto out_putfd; |
1da177e4c Linux-2.6.12-rc2 |
739 |
} |
312b90fbe mqueue: lift mnt_... |
740 |
path.mnt = mntget(mnt); |
066cc813e do_mq_open(): mov... |
741 742 743 744 745 746 747 |
error = prepare_open(path.dentry, oflag, ro, mode, name, attr); if (!error) { struct file *file = dentry_open(&path, oflag, current_cred()); if (!IS_ERR(file)) fd_install(fd, file); else error = PTR_ERR(file); |
7c7dce920 [PATCH] Fix doubl... |
748 |
} |
765927b2d switch dentry_ope... |
749 |
path_put(&path); |
7c7dce920 [PATCH] Fix doubl... |
750 |
out_putfd: |
765927b2d switch dentry_ope... |
751 752 753 754 |
if (error) { put_unused_fd(fd); fd = error; } |
5955102c9 wrappers for ->i_... |
755 |
inode_unlock(d_inode(root)); |
38d78e587 mqueue: sys_mq_op... |
756 757 |
if (!ro) mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
758 759 760 761 |
out_putname: putname(name); return fd; } |
0d0606060 mqueue: move comp... |
762 763 764 765 766 767 768 769 770 |
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, struct mq_attr __user *, u_attr) { struct mq_attr attr; if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) return -EFAULT; return do_mq_open(u_name, oflag, mode, u_attr ? &attr : NULL); } |
d5460c997 [CVE-2009-0029] S... |
771 |
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
1da177e4c Linux-2.6.12-rc2 |
772 773 |
{ int err; |
91a27b2a7 vfs: define struc... |
774 |
struct filename *name; |
1da177e4c Linux-2.6.12-rc2 |
775 776 |
struct dentry *dentry; struct inode *inode = NULL; |
7eafd7c74 namespaces: ipc n... |
777 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
778 |
struct vfsmount *mnt = ipc_ns->mq_mnt; |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 782 |
name = getname(u_name); if (IS_ERR(name)) return PTR_ERR(name); |
79f6530cb audit: fix mq_ope... |
783 |
audit_inode_parent_hidden(name, mnt->mnt_root); |
312b90fbe mqueue: lift mnt_... |
784 785 786 |
err = mnt_want_write(mnt); if (err) goto out_name; |
5955102c9 wrappers for ->i_... |
787 |
inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
91a27b2a7 vfs: define struc... |
788 789 |
dentry = lookup_one_len(name->name, mnt->mnt_root, strlen(name->name)); |
1da177e4c Linux-2.6.12-rc2 |
790 791 792 793 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_unlock; } |
75c3cfa85 VFS: assorted wei... |
794 |
inode = d_inode(dentry); |
312b90fbe mqueue: lift mnt_... |
795 796 797 |
if (!inode) { err = -ENOENT; } else { |
7de9c6ee3 new helper: ihold() |
798 |
ihold(inode); |
75c3cfa85 VFS: assorted wei... |
799 |
err = vfs_unlink(d_inode(dentry->d_parent), dentry, NULL); |
312b90fbe mqueue: lift mnt_... |
800 |
} |
1da177e4c Linux-2.6.12-rc2 |
801 802 803 |
dput(dentry); out_unlock: |
5955102c9 wrappers for ->i_... |
804 |
inode_unlock(d_inode(mnt->mnt_root)); |
1da177e4c Linux-2.6.12-rc2 |
805 806 |
if (inode) iput(inode); |
312b90fbe mqueue: lift mnt_... |
807 808 809 |
mnt_drop_write(mnt); out_name: putname(name); |
1da177e4c Linux-2.6.12-rc2 |
810 811 812 813 814 815 816 817 818 819 |
return err; } /* Pipelined send and receive functions. * * If a receiver finds no waiting message, then it registers itself in the * list of waiting receivers. A sender checks that list before adding the new * message into the message array. If there is a waiting receiver, then it * bypasses the message array and directly hands the message over to the |
fa6004ad4 ipc/mqueue: Imple... |
820 821 822 823 824 825 826 827 828 |
* receiver. The receiver accepts the message and returns without grabbing the * queue spinlock: * * - Set pointer to message. * - Queue the receiver task for later wakeup (without the info->lock). * - Update its state to STATE_READY. Now the receiver can continue. * - Wake up the process after the lock is dropped. Should the process wake up * before this wakeup (due to a timeout or a signal) it will either see * STATE_READY and continue or acquire the lock to check the state again. |
1da177e4c Linux-2.6.12-rc2 |
829 830 831 832 833 834 835 |
* * The same algorithm is used for senders. */ /* pipelined_send() - send a message directly to the task waiting in * sys_mq_timedreceive() (without inserting message into a queue). */ |
fa6004ad4 ipc/mqueue: Imple... |
836 837 |
static inline void pipelined_send(struct wake_q_head *wake_q, struct mqueue_inode_info *info, |
1da177e4c Linux-2.6.12-rc2 |
838 839 840 841 842 |
struct msg_msg *message, struct ext_wait_queue *receiver) { receiver->msg = message; list_del(&receiver->list); |
fa6004ad4 ipc/mqueue: Imple... |
843 844 845 846 847 848 849 850 851 |
wake_q_add(wake_q, receiver->task); /* * Rely on the implicit cmpxchg barrier from wake_q_add such * that we can ensure that updating receiver->state is the last * write operation: As once set, the receiver can continue, * and if we don't have the reference count from the wake_q, * yet, at that point we can later have a use-after-free * condition and bogus wakeup. */ |
1da177e4c Linux-2.6.12-rc2 |
852 853 854 855 856 |
receiver->state = STATE_READY; } /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() * gets its message and put to the queue (we have one free place for sure). */ |
fa6004ad4 ipc/mqueue: Imple... |
857 858 |
static inline void pipelined_receive(struct wake_q_head *wake_q, struct mqueue_inode_info *info) |
1da177e4c Linux-2.6.12-rc2 |
859 860 861 862 863 864 865 866 |
{ struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND); if (!sender) { /* for poll */ wake_up_interruptible(&info->wait_q); return; } |
d6629859b ipc/mqueue: impro... |
867 868 |
if (msg_insert(sender->msg, info)) return; |
fa6004ad4 ipc/mqueue: Imple... |
869 |
|
1da177e4c Linux-2.6.12-rc2 |
870 |
list_del(&sender->list); |
fa6004ad4 ipc/mqueue: Imple... |
871 |
wake_q_add(wake_q, sender->task); |
1da177e4c Linux-2.6.12-rc2 |
872 873 |
sender->state = STATE_READY; } |
0d0606060 mqueue: move comp... |
874 875 |
static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr, size_t msg_len, unsigned int msg_prio, |
b90477263 ipc: mqueue: Repl... |
876 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
877 |
{ |
2903ff019 switch simple cas... |
878 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
879 880 881 882 883 |
struct inode *inode; struct ext_wait_queue wait; struct ext_wait_queue *receiver; struct msg_msg *msg_ptr; struct mqueue_inode_info *info; |
9ca7d8e68 mqueue: Convert m... |
884 |
ktime_t expires, *timeout = NULL; |
ce2d52cc1 ipc/mqueue: add r... |
885 |
struct posix_msg_tree_node *new_leaf = NULL; |
2903ff019 switch simple cas... |
886 |
int ret = 0; |
194a6b5b9 sched/wake_q: Ren... |
887 |
DEFINE_WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
888 889 890 |
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) return -EINVAL; |
0d0606060 mqueue: move comp... |
891 |
if (ts) { |
b90477263 ipc: mqueue: Repl... |
892 |
expires = timespec64_to_ktime(*ts); |
0d0606060 mqueue: move comp... |
893 894 895 896 |
timeout = &expires; } audit_mq_sendrecv(mqdes, msg_len, msg_prio, ts); |
1da177e4c Linux-2.6.12-rc2 |
897 |
|
2903ff019 switch simple cas... |
898 899 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
900 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
901 |
goto out; |
8d8ffefaa mqueue: only set ... |
902 |
} |
1da177e4c Linux-2.6.12-rc2 |
903 |
|
496ad9aa8 new helper: file_... |
904 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
905 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
906 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
907 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
908 |
} |
1da177e4c Linux-2.6.12-rc2 |
909 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
910 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
911 |
|
2903ff019 switch simple cas... |
912 |
if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
8d8ffefaa mqueue: only set ... |
913 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
914 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
915 |
} |
1da177e4c Linux-2.6.12-rc2 |
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 |
if (unlikely(msg_len > info->attr.mq_msgsize)) { ret = -EMSGSIZE; goto out_fput; } /* First try to allocate memory, before doing anything with * existing queues. */ msg_ptr = load_msg(u_msg_ptr, msg_len); if (IS_ERR(msg_ptr)) { ret = PTR_ERR(msg_ptr); goto out_fput; } msg_ptr->m_ts = msg_len; msg_ptr->m_type = msg_prio; |
ce2d52cc1 ipc/mqueue: add r... |
931 932 933 934 935 936 937 |
/* * msg_insert really wants us to have a valid, spare node struct so * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will * fall back to that if necessary. */ if (!info->node_cache) new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
938 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
939 940 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
941 942 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
943 944 945 946 |
new_leaf = NULL; } else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
947 |
if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
2903ff019 switch simple cas... |
948 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
949 |
ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
950 951 952 953 954 |
} else { wait.task = current; wait.msg = (void *) msg_ptr; wait.state = STATE_NONE; ret = wq_sleep(info, SEND, timeout, &wait); |
ce2d52cc1 ipc/mqueue: add r... |
955 956 957 958 959 |
/* * wq_sleep must be called with info->lock held, and * returns with the lock released */ goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
960 |
} |
1da177e4c Linux-2.6.12-rc2 |
961 962 963 |
} else { receiver = wq_get_first_waiter(info, RECV); if (receiver) { |
fa6004ad4 ipc/mqueue: Imple... |
964 |
pipelined_send(&wake_q, info, msg_ptr, receiver); |
1da177e4c Linux-2.6.12-rc2 |
965 966 |
} else { /* adds message to the queue */ |
ce2d52cc1 ipc/mqueue: add r... |
967 968 969 |
ret = msg_insert(msg_ptr, info); if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 |
__do_notify(info); } inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
973 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
ce2d52cc1 ipc/mqueue: add r... |
975 976 |
out_unlock: spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
977 |
wake_up_q(&wake_q); |
ce2d52cc1 ipc/mqueue: add r... |
978 979 980 |
out_free: if (ret) free_msg(msg_ptr); |
1da177e4c Linux-2.6.12-rc2 |
981 |
out_fput: |
2903ff019 switch simple cas... |
982 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
983 984 985 |
out: return ret; } |
0d0606060 mqueue: move comp... |
986 987 |
static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr, size_t msg_len, unsigned int __user *u_msg_prio, |
b90477263 ipc: mqueue: Repl... |
988 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
989 |
{ |
1da177e4c Linux-2.6.12-rc2 |
990 991 |
ssize_t ret; struct msg_msg *msg_ptr; |
2903ff019 switch simple cas... |
992 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
993 994 995 |
struct inode *inode; struct mqueue_inode_info *info; struct ext_wait_queue wait; |
9ca7d8e68 mqueue: Convert m... |
996 |
ktime_t expires, *timeout = NULL; |
ce2d52cc1 ipc/mqueue: add r... |
997 |
struct posix_msg_tree_node *new_leaf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
998 |
|
0d0606060 mqueue: move comp... |
999 |
if (ts) { |
b90477263 ipc: mqueue: Repl... |
1000 |
expires = timespec64_to_ktime(*ts); |
9ca7d8e68 mqueue: Convert m... |
1001 |
timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
1002 |
} |
20ca73bc7 [PATCH] Audit of ... |
1003 |
|
0d0606060 mqueue: move comp... |
1004 |
audit_mq_sendrecv(mqdes, msg_len, 0, ts); |
1da177e4c Linux-2.6.12-rc2 |
1005 |
|
2903ff019 switch simple cas... |
1006 1007 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
1008 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1009 |
goto out; |
8d8ffefaa mqueue: only set ... |
1010 |
} |
1da177e4c Linux-2.6.12-rc2 |
1011 |
|
496ad9aa8 new helper: file_... |
1012 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1013 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1014 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1015 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1016 |
} |
1da177e4c Linux-2.6.12-rc2 |
1017 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
1018 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
1019 |
|
2903ff019 switch simple cas... |
1020 |
if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
8d8ffefaa mqueue: only set ... |
1021 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1022 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1023 |
} |
1da177e4c Linux-2.6.12-rc2 |
1024 1025 1026 1027 1028 1029 |
/* checks if buffer is big enough */ if (unlikely(msg_len < info->attr.mq_msgsize)) { ret = -EMSGSIZE; goto out_fput; } |
ce2d52cc1 ipc/mqueue: add r... |
1030 1031 1032 1033 1034 1035 1036 |
/* * msg_insert really wants us to have a valid, spare node struct so * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will * fall back to that if necessary. */ if (!info->node_cache) new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1037 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
1038 1039 1040 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
1041 1042 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
1043 1044 1045 |
} else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1046 |
if (info->attr.mq_curmsgs == 0) { |
2903ff019 switch simple cas... |
1047 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1048 1049 |
spin_unlock(&info->lock); ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 1053 1054 1055 1056 |
} else { wait.task = current; wait.state = STATE_NONE; ret = wq_sleep(info, RECV, timeout, &wait); msg_ptr = wait.msg; } } else { |
194a6b5b9 sched/wake_q: Ren... |
1057 |
DEFINE_WAKE_Q(wake_q); |
fa6004ad4 ipc/mqueue: Imple... |
1058 |
|
1da177e4c Linux-2.6.12-rc2 |
1059 1060 1061 |
msg_ptr = msg_get(info); inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
1062 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1063 1064 |
/* There is now free space in queue. */ |
fa6004ad4 ipc/mqueue: Imple... |
1065 |
pipelined_receive(&wake_q, info); |
1da177e4c Linux-2.6.12-rc2 |
1066 |
spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1067 |
wake_up_q(&wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
ret = 0; } if (ret == 0) { ret = msg_ptr->m_ts; if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) || store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) { ret = -EFAULT; } free_msg(msg_ptr); } out_fput: |
2903ff019 switch simple cas... |
1080 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 |
out: return ret; } |
0d0606060 mqueue: move comp... |
1084 1085 |
SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, size_t, msg_len, unsigned int, msg_prio, |
21fc538d8 y2038: ipc: Use _... |
1086 |
const struct __kernel_timespec __user *, u_abs_timeout) |
0d0606060 mqueue: move comp... |
1087 |
{ |
b90477263 ipc: mqueue: Repl... |
1088 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 |
if (u_abs_timeout) { int res = prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); } SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, size_t, msg_len, unsigned int __user *, u_msg_prio, |
21fc538d8 y2038: ipc: Use _... |
1100 |
const struct __kernel_timespec __user *, u_abs_timeout) |
0d0606060 mqueue: move comp... |
1101 |
{ |
b90477263 ipc: mqueue: Repl... |
1102 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1103 1104 1105 1106 1107 1108 1109 1110 |
if (u_abs_timeout) { int res = prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } |
1da177e4c Linux-2.6.12-rc2 |
1111 1112 1113 1114 1115 |
/* * Notes: the case when user wants us to deregister (with NULL as pointer) * and he isn't currently owner of notification, will be silently discarded. * It isn't explicitly defined in the POSIX. */ |
0d0606060 mqueue: move comp... |
1116 |
static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
1da177e4c Linux-2.6.12-rc2 |
1117 |
{ |
2903ff019 switch simple cas... |
1118 1119 |
int ret; struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 |
struct sock *sock; struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
1122 1123 |
struct mqueue_inode_info *info; struct sk_buff *nc; |
0d0606060 mqueue: move comp... |
1124 |
audit_mq_notify(mqdes, notification); |
1da177e4c Linux-2.6.12-rc2 |
1125 |
|
20114f71b sanitize audit_mq... |
1126 1127 |
nc = NULL; sock = NULL; |
0d0606060 mqueue: move comp... |
1128 1129 1130 1131 |
if (notification != NULL) { if (unlikely(notification->sigev_notify != SIGEV_NONE && notification->sigev_notify != SIGEV_SIGNAL && notification->sigev_notify != SIGEV_THREAD)) |
1da177e4c Linux-2.6.12-rc2 |
1132 |
return -EINVAL; |
0d0606060 mqueue: move comp... |
1133 1134 |
if (notification->sigev_notify == SIGEV_SIGNAL && !valid_signal(notification->sigev_signo)) { |
1da177e4c Linux-2.6.12-rc2 |
1135 1136 |
return -EINVAL; } |
0d0606060 mqueue: move comp... |
1137 |
if (notification->sigev_notify == SIGEV_THREAD) { |
c3d8d1e30 [NETLINK]: Fix un... |
1138 |
long timeo; |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 |
/* create the notify skb */ nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
8d8ffefaa mqueue: only set ... |
1141 1142 |
if (!nc) { ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1143 |
goto out; |
8d8ffefaa mqueue: only set ... |
1144 |
} |
1da177e4c Linux-2.6.12-rc2 |
1145 |
if (copy_from_user(nc->data, |
0d0606060 mqueue: move comp... |
1146 |
notification->sigev_value.sival_ptr, |
1da177e4c Linux-2.6.12-rc2 |
1147 |
NOTIFY_COOKIE_LEN)) { |
8d8ffefaa mqueue: only set ... |
1148 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1149 1150 1151 1152 1153 1154 1155 |
goto out; } /* TODO: add a header? */ skb_put(nc, NOTIFY_COOKIE_LEN); /* and attach it to the socket */ retry: |
0d0606060 mqueue: move comp... |
1156 |
f = fdget(notification->sigev_signo); |
2903ff019 switch simple cas... |
1157 |
if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1158 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1159 |
goto out; |
8d8ffefaa mqueue: only set ... |
1160 |
} |
2903ff019 switch simple cas... |
1161 1162 |
sock = netlink_getsockbyfilp(f.file); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1163 1164 1165 1166 1167 |
if (IS_ERR(sock)) { ret = PTR_ERR(sock); sock = NULL; goto out; } |
c3d8d1e30 [NETLINK]: Fix un... |
1168 |
timeo = MAX_SCHEDULE_TIMEOUT; |
9457afee8 netlink: Remove n... |
1169 |
ret = netlink_attachskb(sock, nc, &timeo, NULL); |
f991af3da mqueue: fix a use... |
1170 1171 |
if (ret == 1) { sock = NULL; |
8d8ffefaa mqueue: only set ... |
1172 |
goto retry; |
f991af3da mqueue: fix a use... |
1173 |
} |
1da177e4c Linux-2.6.12-rc2 |
1174 1175 1176 1177 1178 1179 1180 |
if (ret) { sock = NULL; nc = NULL; goto out; } } } |
2903ff019 switch simple cas... |
1181 1182 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1183 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1184 |
goto out; |
8d8ffefaa mqueue: only set ... |
1185 |
} |
1da177e4c Linux-2.6.12-rc2 |
1186 |
|
496ad9aa8 new helper: file_... |
1187 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1188 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1189 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1190 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1191 |
} |
1da177e4c Linux-2.6.12-rc2 |
1192 1193 1194 1195 |
info = MQUEUE_I(inode); ret = 0; spin_lock(&info->lock); |
0d0606060 mqueue: move comp... |
1196 |
if (notification == NULL) { |
a03fcb730 [PATCH] update mq... |
1197 |
if (info->notify_owner == task_tgid(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1198 |
remove_notification(info); |
078cd8279 fs: Replace CURRE... |
1199 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1200 |
} |
a03fcb730 [PATCH] update mq... |
1201 |
} else if (info->notify_owner != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 |
ret = -EBUSY; } else { |
0d0606060 mqueue: move comp... |
1204 |
switch (notification->sigev_notify) { |
1da177e4c Linux-2.6.12-rc2 |
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 |
case SIGEV_NONE: info->notify.sigev_notify = SIGEV_NONE; break; case SIGEV_THREAD: info->notify_sock = sock; info->notify_cookie = nc; sock = NULL; nc = NULL; info->notify.sigev_notify = SIGEV_THREAD; break; case SIGEV_SIGNAL: |
0d0606060 mqueue: move comp... |
1216 1217 |
info->notify.sigev_signo = notification->sigev_signo; info->notify.sigev_value = notification->sigev_value; |
1da177e4c Linux-2.6.12-rc2 |
1218 1219 1220 |
info->notify.sigev_notify = SIGEV_SIGNAL; break; } |
a03fcb730 [PATCH] update mq... |
1221 1222 |
info->notify_owner = get_pid(task_tgid(current)); |
6f9ac6d93 mqueue: Explicitl... |
1223 |
info->notify_user_ns = get_user_ns(current_user_ns()); |
078cd8279 fs: Replace CURRE... |
1224 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1225 1226 1227 |
} spin_unlock(&info->lock); out_fput: |
2903ff019 switch simple cas... |
1228 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1229 |
out: |
3ab08fe20 ipc: remove brace... |
1230 |
if (sock) |
1da177e4c Linux-2.6.12-rc2 |
1231 |
netlink_detachskb(sock, nc); |
3ab08fe20 ipc: remove brace... |
1232 |
else if (nc) |
1da177e4c Linux-2.6.12-rc2 |
1233 |
dev_kfree_skb(nc); |
3ab08fe20 ipc: remove brace... |
1234 |
|
1da177e4c Linux-2.6.12-rc2 |
1235 1236 |
return ret; } |
0d0606060 mqueue: move comp... |
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 |
SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification) { struct sigevent n, *p = NULL; if (u_notification) { if (copy_from_user(&n, u_notification, sizeof(struct sigevent))) return -EFAULT; p = &n; } return do_mq_notify(mqdes, p); } static int do_mq_getsetattr(int mqdes, struct mq_attr *new, struct mq_attr *old) |
1da177e4c Linux-2.6.12-rc2 |
1250 |
{ |
2903ff019 switch simple cas... |
1251 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1252 1253 |
struct inode *inode; struct mqueue_inode_info *info; |
0d0606060 mqueue: move comp... |
1254 1255 |
if (new && (new->mq_flags & (~O_NONBLOCK))) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1256 |
|
2903ff019 switch simple cas... |
1257 |
f = fdget(mqdes); |
0d0606060 mqueue: move comp... |
1258 1259 |
if (!f.file) return -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1260 |
|
2903ff019 switch simple cas... |
1261 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
0d0606060 mqueue: move comp... |
1262 1263 |
fdput(f); return -EBADF; |
8d8ffefaa mqueue: only set ... |
1264 |
} |
0d0606060 mqueue: move comp... |
1265 1266 |
inode = file_inode(f.file); |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 1269 |
info = MQUEUE_I(inode); spin_lock(&info->lock); |
0d0606060 mqueue: move comp... |
1270 1271 1272 1273 1274 1275 |
if (old) { *old = info->attr; old->mq_flags = f.file->f_flags & O_NONBLOCK; } if (new) { audit_mq_getsetattr(mqdes, new); |
2903ff019 switch simple cas... |
1276 |
spin_lock(&f.file->f_lock); |
0d0606060 mqueue: move comp... |
1277 |
if (new->mq_flags & O_NONBLOCK) |
2903ff019 switch simple cas... |
1278 |
f.file->f_flags |= O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1279 |
else |
2903ff019 switch simple cas... |
1280 1281 |
f.file->f_flags &= ~O_NONBLOCK; spin_unlock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1282 |
|
078cd8279 fs: Replace CURRE... |
1283 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1284 1285 1286 |
} spin_unlock(&info->lock); |
0d0606060 mqueue: move comp... |
1287 1288 1289 |
fdput(f); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1290 |
|
0d0606060 mqueue: move comp... |
1291 1292 1293 1294 1295 1296 1297 |
SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct mq_attr __user *, u_mqstat, struct mq_attr __user *, u_omqstat) { int ret; struct mq_attr mqstat, omqstat; struct mq_attr *new = NULL, *old = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1298 |
|
0d0606060 mqueue: move comp... |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 |
if (u_mqstat) { new = &mqstat; if (copy_from_user(new, u_mqstat, sizeof(struct mq_attr))) return -EFAULT; } if (u_omqstat) old = &omqstat; ret = do_mq_getsetattr(mqdes, new, old); if (ret || !old) return ret; if (copy_to_user(u_omqstat, old, sizeof(struct mq_attr))) return -EFAULT; return 0; } #ifdef CONFIG_COMPAT struct compat_mq_attr { compat_long_t mq_flags; /* message queue flags */ compat_long_t mq_maxmsg; /* maximum number of messages */ compat_long_t mq_msgsize; /* maximum message size */ compat_long_t mq_curmsgs; /* number of messages currently queued */ compat_long_t __reserved[4]; /* ignored for input, zeroed for output */ }; static inline int get_compat_mq_attr(struct mq_attr *attr, const struct compat_mq_attr __user *uattr) { struct compat_mq_attr v; if (copy_from_user(&v, uattr, sizeof(*uattr))) return -EFAULT; memset(attr, 0, sizeof(*attr)); attr->mq_flags = v.mq_flags; attr->mq_maxmsg = v.mq_maxmsg; attr->mq_msgsize = v.mq_msgsize; attr->mq_curmsgs = v.mq_curmsgs; return 0; } static inline int put_compat_mq_attr(const struct mq_attr *attr, struct compat_mq_attr __user *uattr) { struct compat_mq_attr v; memset(&v, 0, sizeof(v)); v.mq_flags = attr->mq_flags; v.mq_maxmsg = attr->mq_maxmsg; v.mq_msgsize = attr->mq_msgsize; v.mq_curmsgs = attr->mq_curmsgs; if (copy_to_user(uattr, &v, sizeof(*uattr))) return -EFAULT; return 0; } COMPAT_SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, compat_mode_t, mode, struct compat_mq_attr __user *, u_attr) { struct mq_attr attr, *p = NULL; if (u_attr && oflag & O_CREAT) { p = &attr; if (get_compat_mq_attr(&attr, u_attr)) return -EFAULT; } return do_mq_open(u_name, oflag, mode, p); } |
b0d175781 y2038: ipc: Enabl... |
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 |
COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct compat_sigevent __user *, u_notification) { struct sigevent n, *p = NULL; if (u_notification) { if (get_compat_sigevent(&n, u_notification)) return -EFAULT; if (n.sigev_notify == SIGEV_THREAD) n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); p = &n; } return do_mq_notify(mqdes, p); } COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct compat_mq_attr __user *, u_mqstat, struct compat_mq_attr __user *, u_omqstat) { int ret; struct mq_attr mqstat, omqstat; struct mq_attr *new = NULL, *old = NULL; if (u_mqstat) { new = &mqstat; if (get_compat_mq_attr(new, u_mqstat)) return -EFAULT; } if (u_omqstat) old = &omqstat; ret = do_mq_getsetattr(mqdes, new, old); if (ret || !old) return ret; if (put_compat_mq_attr(old, u_omqstat)) return -EFAULT; return 0; } #endif #ifdef CONFIG_COMPAT_32BIT_TIME |
0d0606060 mqueue: move comp... |
1410 |
static int compat_prepare_timeout(const struct compat_timespec __user *p, |
b90477263 ipc: mqueue: Repl... |
1411 |
struct timespec64 *ts) |
0d0606060 mqueue: move comp... |
1412 |
{ |
b90477263 ipc: mqueue: Repl... |
1413 |
if (compat_get_timespec64(ts, p)) |
0d0606060 mqueue: move comp... |
1414 |
return -EFAULT; |
b90477263 ipc: mqueue: Repl... |
1415 |
if (!timespec64_valid(ts)) |
0d0606060 mqueue: move comp... |
1416 1417 1418 1419 1420 1421 1422 1423 1424 |
return -EINVAL; return 0; } COMPAT_SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int, msg_prio, const struct compat_timespec __user *, u_abs_timeout) { |
b90477263 ipc: mqueue: Repl... |
1425 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 |
if (u_abs_timeout) { int res = compat_prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); } COMPAT_SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int __user *, u_msg_prio, const struct compat_timespec __user *, u_abs_timeout) { |
b90477263 ipc: mqueue: Repl... |
1440 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1441 1442 1443 1444 1445 1446 1447 1448 |
if (u_abs_timeout) { int res = compat_prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } |
0d0606060 mqueue: move comp... |
1449 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1450 |
|
92e1d5be9 [PATCH] mark stru... |
1451 |
static const struct inode_operations mqueue_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1452 1453 1454 1455 |
.lookup = simple_lookup, .create = mqueue_create, .unlink = mqueue_unlink, }; |
9a32144e9 [PATCH] mark stru... |
1456 |
static const struct file_operations mqueue_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1457 1458 1459 |
.flush = mqueue_flush_file, .poll = mqueue_poll_file, .read = mqueue_read_file, |
6038f373a llseek: automatic... |
1460 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1461 |
}; |
b87221de6 const: mark remai... |
1462 |
static const struct super_operations mqueue_super_ops = { |
1da177e4c Linux-2.6.12-rc2 |
1463 1464 |
.alloc_inode = mqueue_alloc_inode, .destroy_inode = mqueue_destroy_inode, |
6d8af64c1 switch mqueue to ... |
1465 |
.evict_inode = mqueue_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
1466 |
.statfs = simple_statfs, |
1da177e4c Linux-2.6.12-rc2 |
1467 1468 1469 1470 |
}; static struct file_system_type mqueue_fs_type = { .name = "mqueue", |
ceefda693 switch get_sb_ns(... |
1471 |
.mount = mqueue_mount, |
1da177e4c Linux-2.6.12-rc2 |
1472 |
.kill_sb = kill_litter_super, |
bc1b69ed2 userns: Allow the... |
1473 |
.fs_flags = FS_USERNS_MOUNT, |
1da177e4c Linux-2.6.12-rc2 |
1474 |
}; |
7eafd7c74 namespaces: ipc n... |
1475 1476 1477 1478 1479 1480 |
int mq_init_ns(struct ipc_namespace *ns) { ns->mq_queues_count = 0; ns->mq_queues_max = DFLT_QUEUESMAX; ns->mq_msg_max = DFLT_MSGMAX; ns->mq_msgsize_max = DFLT_MSGSIZEMAX; |
cef0184c1 mqueue: separate ... |
1481 1482 |
ns->mq_msg_default = DFLT_MSG; ns->mq_msgsize_default = DFLT_MSGSIZE; |
7eafd7c74 namespaces: ipc n... |
1483 |
|
cfb2f6f6e Revert "mqueue: s... |
1484 1485 1486 1487 1488 1489 |
ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns); if (IS_ERR(ns->mq_mnt)) { int err = PTR_ERR(ns->mq_mnt); ns->mq_mnt = NULL; return err; } |
7eafd7c74 namespaces: ipc n... |
1490 1491 1492 1493 1494 |
return 0; } void mq_clear_sbinfo(struct ipc_namespace *ns) { |
cfb2f6f6e Revert "mqueue: s... |
1495 |
ns->mq_mnt->mnt_sb->s_fs_info = NULL; |
7eafd7c74 namespaces: ipc n... |
1496 1497 1498 1499 |
} void mq_put_mnt(struct ipc_namespace *ns) { |
cfb2f6f6e Revert "mqueue: s... |
1500 |
kern_unmount(ns->mq_mnt); |
7eafd7c74 namespaces: ipc n... |
1501 |
} |
1da177e4c Linux-2.6.12-rc2 |
1502 1503 1504 1505 1506 1507 |
static int __init init_mqueue_fs(void) { int error; mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache", sizeof(struct mqueue_inode_info), 0, |
5d097056c kmemcg: account c... |
1508 |
SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
1da177e4c Linux-2.6.12-rc2 |
1509 1510 |
if (mqueue_inode_cachep == NULL) return -ENOMEM; |
2329e392a mqueue: fix typo ... |
1511 |
/* ignore failures - they are not fatal */ |
bdc8e5f85 namespaces: mqueu... |
1512 |
mq_sysctl_table = mq_register_sysctl_table(); |
1da177e4c Linux-2.6.12-rc2 |
1513 1514 1515 1516 |
error = register_filesystem(&mqueue_fs_type); if (error) goto out_sysctl; |
7eafd7c74 namespaces: ipc n... |
1517 |
spin_lock_init(&mq_lock); |
6f686574c ... and the same ... |
1518 1519 |
error = mq_init_ns(&init_ipc_ns); if (error) |
1da177e4c Linux-2.6.12-rc2 |
1520 |
goto out_filesystem; |
1da177e4c Linux-2.6.12-rc2 |
1521 |
|
1da177e4c Linux-2.6.12-rc2 |
1522 1523 1524 1525 1526 1527 1528 |
return 0; out_filesystem: unregister_filesystem(&mqueue_fs_type); out_sysctl: if (mq_sysctl_table) unregister_sysctl_table(mq_sysctl_table); |
1a1d92c10 [PATCH] Really ig... |
1529 |
kmem_cache_destroy(mqueue_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
1530 1531 |
return error; } |
6d08a2567 ipc: use device_i... |
1532 |
device_initcall(init_mqueue_fs); |