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ipc/mqueue.c
35.7 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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|
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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(); inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME; 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. */ 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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|
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mq_bytes = mq_treesize + (info->attr.mq_maxmsg * info->attr.mq_msgsize); |
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|
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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 = data; |
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sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 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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if (!(flags & MS_KERNMOUNT)) { struct ipc_namespace *ns = current->nsproxy->ipc_ns; /* Don't allow mounting unless the caller has CAP_SYS_ADMIN * over the ipc namespace. */ if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN)) return ERR_PTR(-EPERM); data = ns; } |
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return mount_ns(fs_type, flags, data, 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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} static int mqueue_create(struct inode *dir, struct dentry *dentry, |
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umode_t mode, bool excl) |
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{ struct inode *inode; struct mq_attr *attr = dentry->d_fsdata; 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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ipc_ns->mq_queues_count++; |
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spin_unlock(&mq_lock); |
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inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
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if (IS_ERR(inode)) { error = PTR_ERR(inode); |
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spin_lock(&mq_lock); |
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ipc_ns->mq_queues_count--; goto out_unlock; |
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} |
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put_ipc_ns(ipc_ns); |
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dir->i_size += DIRENT_SIZE; dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; d_instantiate(dentry, inode); dget(dentry); return 0; |
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out_unlock: |
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spin_unlock(&mq_lock); |
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if (ipc_ns) put_ipc_ns(ipc_ns); |
1da177e4c Linux-2.6.12-rc2 |
441 442 443 444 445 |
return error; } static int mqueue_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
446 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
447 448 449 |
dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; dir->i_size -= DIRENT_SIZE; |
239521f31 ipc: whitespace c... |
450 451 452 |
drop_nlink(inode); dput(dentry); return 0; |
1da177e4c Linux-2.6.12-rc2 |
453 454 455 456 457 458 459 460 461 462 |
} /* * 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... |
463 |
size_t count, loff_t *off) |
1da177e4c Linux-2.6.12-rc2 |
464 |
{ |
496ad9aa8 new helper: file_... |
465 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
466 |
char buffer[FILENT_SIZE]; |
f1a43f93f ipc: use simple_r... |
467 |
ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
468 469 470 471 472 473 474 475 476 477 |
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 ... |
478 |
pid_vnr(info->notify_owner)); |
1da177e4c Linux-2.6.12-rc2 |
479 480 |
spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; |
1da177e4c Linux-2.6.12-rc2 |
481 |
|
f1a43f93f ipc: use simple_r... |
482 483 484 485 |
ret = simple_read_from_buffer(u_data, count, off, buffer, strlen(buffer)); if (ret <= 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
486 |
|
496ad9aa8 new helper: file_... |
487 |
file_inode(filp)->i_atime = file_inode(filp)->i_ctime = CURRENT_TIME; |
f1a43f93f ipc: use simple_r... |
488 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
489 |
} |
75e1fcc0b [PATCH] vfs: add ... |
490 |
static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
1da177e4c Linux-2.6.12-rc2 |
491 |
{ |
496ad9aa8 new helper: file_... |
492 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
493 494 |
spin_lock(&info->lock); |
a03fcb730 [PATCH] update mq... |
495 |
if (task_tgid(current) == info->notify_owner) |
1da177e4c Linux-2.6.12-rc2 |
496 497 498 499 500 501 502 503 |
remove_notification(info); spin_unlock(&info->lock); return 0; } static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) { |
496ad9aa8 new helper: file_... |
504 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 |
int retval = 0; poll_wait(filp, &info->wait_q, poll_tab); spin_lock(&info->lock); if (info->attr.mq_curmsgs) retval = POLLIN | POLLRDNORM; if (info->attr.mq_curmsgs < info->attr.mq_maxmsg) retval |= POLLOUT | POLLWRNORM; 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) { if (walk->task->static_prio <= current->static_prio) { 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... |
543 |
ktime_t *timeout, struct ext_wait_queue *ewp) |
1da177e4c Linux-2.6.12-rc2 |
544 545 546 547 548 549 550 |
{ int retval; signed long time; wq_add(info, sr, ewp); for (;;) { |
fa6004ad4 ipc/mqueue: Imple... |
551 |
__set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
552 553 |
spin_unlock(&info->lock); |
32ea845d5 ipc/mqueue.c: fix... |
554 555 |
time = schedule_hrtimeout_range_clock(timeout, 0, HRTIMER_MODE_ABS, CLOCK_REALTIME); |
1da177e4c Linux-2.6.12-rc2 |
556 |
|
1da177e4c Linux-2.6.12-rc2 |
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 |
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 |
595 596 597 |
static inline void set_cookie(struct sk_buff *skb, char code) { |
239521f31 ipc: whitespace c... |
598 |
((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
1da177e4c Linux-2.6.12-rc2 |
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 |
} /* * 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 */ 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... |
624 625 |
/* map current pid/uid into info->owner's namespaces */ rcu_read_lock(); |
a6684999f mqueue: fix si_pi... |
626 627 |
sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); |
76b6db010 userns: Replace u... |
628 |
sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid()); |
6b550f949 user namespace: m... |
629 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
630 |
|
a03fcb730 [PATCH] update mq... |
631 632 |
kill_pid_info(info->notify.sigev_signo, &sig_i, info->notify_owner); |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 |
break; case SIGEV_THREAD: set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
7ee015e0f [NET]: cleanup 3r... |
636 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
637 638 639 |
break; } /* after notification unregisters process */ |
a03fcb730 [PATCH] update mq... |
640 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
641 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
642 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
643 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
644 645 646 |
} wake_up(&info->wait_q); } |
9ca7d8e68 mqueue: Convert m... |
647 648 |
static int prepare_timeout(const struct timespec __user *u_abs_timeout, ktime_t *expires, struct timespec *ts) |
1da177e4c Linux-2.6.12-rc2 |
649 |
{ |
9ca7d8e68 mqueue: Convert m... |
650 651 652 653 |
if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec))) return -EFAULT; if (!timespec_valid(ts)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
654 |
|
9ca7d8e68 mqueue: Convert m... |
655 656 |
*expires = timespec_to_ktime(*ts); return 0; |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 660 |
} static void remove_notification(struct mqueue_inode_info *info) { |
a03fcb730 [PATCH] update mq... |
661 |
if (info->notify_owner != NULL && |
1da177e4c Linux-2.6.12-rc2 |
662 663 |
info->notify.sigev_notify == SIGEV_THREAD) { set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
7ee015e0f [NET]: cleanup 3r... |
664 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
665 |
} |
a03fcb730 [PATCH] update mq... |
666 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
667 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
668 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
669 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
670 |
} |
614b84cf4 namespaces: mqueu... |
671 |
static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
672 |
{ |
2c12ea498 ipc/mqueue: corre... |
673 674 |
int mq_treesize; unsigned long total_size; |
1da177e4c Linux-2.6.12-rc2 |
675 |
if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) |
113289cc0 ipc/mqueue: stren... |
676 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
677 |
if (capable(CAP_SYS_RESOURCE)) { |
02967ea08 ipc/mqueue: enfor... |
678 679 |
if (attr->mq_maxmsg > HARD_MSGMAX || attr->mq_msgsize > HARD_MSGSIZEMAX) |
113289cc0 ipc/mqueue: stren... |
680 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
681 |
} else { |
614b84cf4 namespaces: mqueu... |
682 683 |
if (attr->mq_maxmsg > ipc_ns->mq_msg_max || attr->mq_msgsize > ipc_ns->mq_msgsize_max) |
113289cc0 ipc/mqueue: stren... |
684 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
685 686 687 |
} /* check for overflow */ if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg) |
113289cc0 ipc/mqueue: stren... |
688 |
return -EOVERFLOW; |
2c12ea498 ipc/mqueue: corre... |
689 690 691 692 693 |
mq_treesize = attr->mq_maxmsg * sizeof(struct msg_msg) + min_t(unsigned int, attr->mq_maxmsg, MQ_PRIO_MAX) * sizeof(struct posix_msg_tree_node); total_size = attr->mq_maxmsg * attr->mq_msgsize; if (total_size + mq_treesize < total_size) |
113289cc0 ipc/mqueue: stren... |
694 695 |
return -EOVERFLOW; return 0; |
1da177e4c Linux-2.6.12-rc2 |
696 697 698 699 700 |
} /* * Invoked when creating a new queue via sys_mq_open */ |
765927b2d switch dentry_ope... |
701 702 |
static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir, struct path *path, int oflag, umode_t mode, |
614b84cf4 namespaces: mqueu... |
703 |
struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
704 |
{ |
745ca2475 CRED: Pass creden... |
705 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
706 |
int ret; |
564f6993f sanitize audit_mq... |
707 |
if (attr) { |
113289cc0 ipc/mqueue: stren... |
708 709 |
ret = mq_attr_ok(ipc_ns, attr); if (ret) |
765927b2d switch dentry_ope... |
710 |
return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
711 |
/* store for use during create */ |
765927b2d switch dentry_ope... |
712 |
path->dentry->d_fsdata = attr; |
113289cc0 ipc/mqueue: stren... |
713 714 715 716 717 718 719 720 721 |
} else { struct mq_attr def_attr; def_attr.mq_maxmsg = min(ipc_ns->mq_msg_max, ipc_ns->mq_msg_default); def_attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, ipc_ns->mq_msgsize_default); ret = mq_attr_ok(ipc_ns, &def_attr); if (ret) |
765927b2d switch dentry_ope... |
722 |
return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
723 |
} |
ce3b0f8d5 New helper - curr... |
724 |
mode &= ~current_umask(); |
765927b2d switch dentry_ope... |
725 726 |
ret = vfs_create(dir, path->dentry, mode, true); path->dentry->d_fsdata = NULL; |
312b90fbe mqueue: lift mnt_... |
727 728 729 |
if (ret) return ERR_PTR(ret); return dentry_open(path, oflag, cred); |
1da177e4c Linux-2.6.12-rc2 |
730 731 732 |
} /* Opens existing queue */ |
765927b2d switch dentry_ope... |
733 |
static struct file *do_open(struct path *path, int oflag) |
1da177e4c Linux-2.6.12-rc2 |
734 |
{ |
745ca2475 CRED: Pass creden... |
735 736 |
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, MAY_READ | MAY_WRITE }; |
765927b2d switch dentry_ope... |
737 738 739 740 |
int acc; if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) return ERR_PTR(-EINVAL); acc = oflag2acc[oflag & O_ACCMODE]; |
75c3cfa85 VFS: assorted wei... |
741 |
if (inode_permission(d_inode(path->dentry), acc)) |
765927b2d switch dentry_ope... |
742 743 |
return ERR_PTR(-EACCES); return dentry_open(path, oflag, current_cred()); |
1da177e4c Linux-2.6.12-rc2 |
744 |
} |
df0a42837 switch mq_open() ... |
745 |
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, |
d5460c997 [CVE-2009-0029] S... |
746 |
struct mq_attr __user *, u_attr) |
1da177e4c Linux-2.6.12-rc2 |
747 |
{ |
765927b2d switch dentry_ope... |
748 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
749 |
struct file *filp; |
91a27b2a7 vfs: define struc... |
750 |
struct filename *name; |
564f6993f sanitize audit_mq... |
751 |
struct mq_attr attr; |
1da177e4c Linux-2.6.12-rc2 |
752 |
int fd, error; |
7eafd7c74 namespaces: ipc n... |
753 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
754 755 756 |
struct vfsmount *mnt = ipc_ns->mq_mnt; struct dentry *root = mnt->mnt_root; int ro; |
1da177e4c Linux-2.6.12-rc2 |
757 |
|
564f6993f sanitize audit_mq... |
758 759 760 761 |
if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) return -EFAULT; audit_mq_open(oflag, mode, u_attr ? &attr : NULL); |
20ca73bc7 [PATCH] Audit of ... |
762 |
|
1da177e4c Linux-2.6.12-rc2 |
763 764 |
if (IS_ERR(name = getname(u_name))) return PTR_ERR(name); |
269f21344 tiny mq_open opti... |
765 |
fd = get_unused_fd_flags(O_CLOEXEC); |
1da177e4c Linux-2.6.12-rc2 |
766 767 |
if (fd < 0) goto out_putname; |
312b90fbe mqueue: lift mnt_... |
768 |
ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
765927b2d switch dentry_ope... |
769 |
error = 0; |
5955102c9 wrappers for ->i_... |
770 |
inode_lock(d_inode(root)); |
91a27b2a7 vfs: define struc... |
771 |
path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
765927b2d switch dentry_ope... |
772 773 |
if (IS_ERR(path.dentry)) { error = PTR_ERR(path.dentry); |
4294a8eed mqueue: fix mq_op... |
774 |
goto out_putfd; |
1da177e4c Linux-2.6.12-rc2 |
775 |
} |
312b90fbe mqueue: lift mnt_... |
776 |
path.mnt = mntget(mnt); |
1da177e4c Linux-2.6.12-rc2 |
777 778 |
if (oflag & O_CREAT) { |
75c3cfa85 VFS: assorted wei... |
779 |
if (d_really_is_positive(path.dentry)) { /* entry already exists */ |
adb5c2473 audit: make audit... |
780 |
audit_inode(name, path.dentry, 0); |
8d8ffefaa mqueue: only set ... |
781 782 |
if (oflag & O_EXCL) { error = -EEXIST; |
7c7dce920 [PATCH] Fix doubl... |
783 |
goto out; |
8d8ffefaa mqueue: only set ... |
784 |
} |
765927b2d switch dentry_ope... |
785 |
filp = do_open(&path, oflag); |
1da177e4c Linux-2.6.12-rc2 |
786 |
} else { |
312b90fbe mqueue: lift mnt_... |
787 788 789 790 |
if (ro) { error = ro; goto out; } |
79f6530cb audit: fix mq_ope... |
791 |
audit_inode_parent_hidden(name, root); |
75c3cfa85 VFS: assorted wei... |
792 |
filp = do_create(ipc_ns, d_inode(root), |
765927b2d switch dentry_ope... |
793 |
&path, oflag, mode, |
564f6993f sanitize audit_mq... |
794 |
u_attr ? &attr : NULL); |
1da177e4c Linux-2.6.12-rc2 |
795 |
} |
7c7dce920 [PATCH] Fix doubl... |
796 |
} else { |
75c3cfa85 VFS: assorted wei... |
797 |
if (d_really_is_negative(path.dentry)) { |
8d8ffefaa mqueue: only set ... |
798 |
error = -ENOENT; |
7c7dce920 [PATCH] Fix doubl... |
799 |
goto out; |
8d8ffefaa mqueue: only set ... |
800 |
} |
adb5c2473 audit: make audit... |
801 |
audit_inode(name, path.dentry, 0); |
765927b2d switch dentry_ope... |
802 |
filp = do_open(&path, oflag); |
7c7dce920 [PATCH] Fix doubl... |
803 |
} |
1da177e4c Linux-2.6.12-rc2 |
804 |
|
765927b2d switch dentry_ope... |
805 806 807 |
if (!IS_ERR(filp)) fd_install(fd, filp); else |
1da177e4c Linux-2.6.12-rc2 |
808 |
error = PTR_ERR(filp); |
7c7dce920 [PATCH] Fix doubl... |
809 |
out: |
765927b2d switch dentry_ope... |
810 |
path_put(&path); |
7c7dce920 [PATCH] Fix doubl... |
811 |
out_putfd: |
765927b2d switch dentry_ope... |
812 813 814 815 |
if (error) { put_unused_fd(fd); fd = error; } |
5955102c9 wrappers for ->i_... |
816 |
inode_unlock(d_inode(root)); |
38d78e587 mqueue: sys_mq_op... |
817 818 |
if (!ro) mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
819 820 821 822 |
out_putname: putname(name); return fd; } |
d5460c997 [CVE-2009-0029] S... |
823 |
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
1da177e4c Linux-2.6.12-rc2 |
824 825 |
{ int err; |
91a27b2a7 vfs: define struc... |
826 |
struct filename *name; |
1da177e4c Linux-2.6.12-rc2 |
827 828 |
struct dentry *dentry; struct inode *inode = NULL; |
7eafd7c74 namespaces: ipc n... |
829 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
830 |
struct vfsmount *mnt = ipc_ns->mq_mnt; |
1da177e4c Linux-2.6.12-rc2 |
831 832 833 834 |
name = getname(u_name); if (IS_ERR(name)) return PTR_ERR(name); |
79f6530cb audit: fix mq_ope... |
835 |
audit_inode_parent_hidden(name, mnt->mnt_root); |
312b90fbe mqueue: lift mnt_... |
836 837 838 |
err = mnt_want_write(mnt); if (err) goto out_name; |
5955102c9 wrappers for ->i_... |
839 |
inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
91a27b2a7 vfs: define struc... |
840 841 |
dentry = lookup_one_len(name->name, mnt->mnt_root, strlen(name->name)); |
1da177e4c Linux-2.6.12-rc2 |
842 843 844 845 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_unlock; } |
75c3cfa85 VFS: assorted wei... |
846 |
inode = d_inode(dentry); |
312b90fbe mqueue: lift mnt_... |
847 848 849 |
if (!inode) { err = -ENOENT; } else { |
7de9c6ee3 new helper: ihold() |
850 |
ihold(inode); |
75c3cfa85 VFS: assorted wei... |
851 |
err = vfs_unlink(d_inode(dentry->d_parent), dentry, NULL); |
312b90fbe mqueue: lift mnt_... |
852 |
} |
1da177e4c Linux-2.6.12-rc2 |
853 854 855 |
dput(dentry); out_unlock: |
5955102c9 wrappers for ->i_... |
856 |
inode_unlock(d_inode(mnt->mnt_root)); |
1da177e4c Linux-2.6.12-rc2 |
857 858 |
if (inode) iput(inode); |
312b90fbe mqueue: lift mnt_... |
859 860 861 |
mnt_drop_write(mnt); out_name: putname(name); |
1da177e4c Linux-2.6.12-rc2 |
862 863 864 865 866 867 868 869 870 871 |
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... |
872 873 874 875 876 877 878 879 880 |
* 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 |
881 882 883 884 885 886 887 |
* * 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... |
888 889 |
static inline void pipelined_send(struct wake_q_head *wake_q, struct mqueue_inode_info *info, |
1da177e4c Linux-2.6.12-rc2 |
890 891 892 893 894 |
struct msg_msg *message, struct ext_wait_queue *receiver) { receiver->msg = message; list_del(&receiver->list); |
fa6004ad4 ipc/mqueue: Imple... |
895 896 897 898 899 900 901 902 903 |
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 |
904 905 906 907 908 |
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... |
909 910 |
static inline void pipelined_receive(struct wake_q_head *wake_q, struct mqueue_inode_info *info) |
1da177e4c Linux-2.6.12-rc2 |
911 912 913 914 915 916 917 918 |
{ 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... |
919 920 |
if (msg_insert(sender->msg, info)) return; |
fa6004ad4 ipc/mqueue: Imple... |
921 |
|
1da177e4c Linux-2.6.12-rc2 |
922 |
list_del(&sender->list); |
fa6004ad4 ipc/mqueue: Imple... |
923 |
wake_q_add(wake_q, sender->task); |
1da177e4c Linux-2.6.12-rc2 |
924 925 |
sender->state = STATE_READY; } |
c4ea37c26 [CVE-2009-0029] S... |
926 927 928 |
SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, size_t, msg_len, unsigned int, msg_prio, const struct timespec __user *, u_abs_timeout) |
1da177e4c Linux-2.6.12-rc2 |
929 |
{ |
2903ff019 switch simple cas... |
930 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 934 935 |
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... |
936 937 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
ce2d52cc1 ipc/mqueue: add r... |
938 |
struct posix_msg_tree_node *new_leaf = NULL; |
2903ff019 switch simple cas... |
939 |
int ret = 0; |
fa6004ad4 ipc/mqueue: Imple... |
940 |
WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
941 |
|
c32c8af43 sanitize AUDIT_MQ... |
942 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
943 944 945 946 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
947 |
} |
20ca73bc7 [PATCH] Audit of ... |
948 |
|
1da177e4c Linux-2.6.12-rc2 |
949 950 |
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) return -EINVAL; |
9ca7d8e68 mqueue: Convert m... |
951 |
audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
952 |
|
2903ff019 switch simple cas... |
953 954 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
955 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
956 |
goto out; |
8d8ffefaa mqueue: only set ... |
957 |
} |
1da177e4c Linux-2.6.12-rc2 |
958 |
|
496ad9aa8 new helper: file_... |
959 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
960 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
961 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
962 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
963 |
} |
1da177e4c Linux-2.6.12-rc2 |
964 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
965 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
966 |
|
2903ff019 switch simple cas... |
967 |
if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
8d8ffefaa mqueue: only set ... |
968 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
969 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
970 |
} |
1da177e4c Linux-2.6.12-rc2 |
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 |
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... |
986 987 988 989 990 991 992 |
/* * 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 |
993 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
994 995 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
996 997 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
998 999 1000 1001 |
new_leaf = NULL; } else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1002 |
if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
2903ff019 switch simple cas... |
1003 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1004 |
ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1005 1006 1007 1008 1009 |
} 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... |
1010 1011 1012 1013 1014 |
/* * wq_sleep must be called with info->lock held, and * returns with the lock released */ goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
1015 |
} |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 |
} else { receiver = wq_get_first_waiter(info, RECV); if (receiver) { |
fa6004ad4 ipc/mqueue: Imple... |
1019 |
pipelined_send(&wake_q, info, msg_ptr, receiver); |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 |
} else { /* adds message to the queue */ |
ce2d52cc1 ipc/mqueue: add r... |
1022 1023 1024 |
ret = msg_insert(msg_ptr, info); if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1025 1026 1027 1028 |
__do_notify(info); } inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
1da177e4c Linux-2.6.12-rc2 |
1029 |
} |
ce2d52cc1 ipc/mqueue: add r... |
1030 1031 |
out_unlock: spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1032 |
wake_up_q(&wake_q); |
ce2d52cc1 ipc/mqueue: add r... |
1033 1034 1035 |
out_free: if (ret) free_msg(msg_ptr); |
1da177e4c Linux-2.6.12-rc2 |
1036 |
out_fput: |
2903ff019 switch simple cas... |
1037 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 |
out: return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
1041 1042 1043 |
SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, size_t, msg_len, unsigned int __user *, u_msg_prio, const struct timespec __user *, u_abs_timeout) |
1da177e4c Linux-2.6.12-rc2 |
1044 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
ssize_t ret; struct msg_msg *msg_ptr; |
2903ff019 switch simple cas... |
1047 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1048 1049 1050 |
struct inode *inode; struct mqueue_inode_info *info; struct ext_wait_queue wait; |
9ca7d8e68 mqueue: Convert m... |
1051 1052 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
ce2d52cc1 ipc/mqueue: add r... |
1053 |
struct posix_msg_tree_node *new_leaf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1054 |
|
c32c8af43 sanitize AUDIT_MQ... |
1055 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
1056 1057 1058 1059 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
1060 |
} |
20ca73bc7 [PATCH] Audit of ... |
1061 |
|
9ca7d8e68 mqueue: Convert m... |
1062 |
audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
1063 |
|
2903ff019 switch simple cas... |
1064 1065 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
1066 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1067 |
goto out; |
8d8ffefaa mqueue: only set ... |
1068 |
} |
1da177e4c Linux-2.6.12-rc2 |
1069 |
|
496ad9aa8 new helper: file_... |
1070 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1071 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1072 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1073 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1074 |
} |
1da177e4c Linux-2.6.12-rc2 |
1075 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
1076 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
1077 |
|
2903ff019 switch simple cas... |
1078 |
if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
8d8ffefaa mqueue: only set ... |
1079 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1080 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1081 |
} |
1da177e4c Linux-2.6.12-rc2 |
1082 1083 1084 1085 1086 1087 |
/* checks if buffer is big enough */ if (unlikely(msg_len < info->attr.mq_msgsize)) { ret = -EMSGSIZE; goto out_fput; } |
ce2d52cc1 ipc/mqueue: add r... |
1088 1089 1090 1091 1092 1093 1094 |
/* * 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 |
1095 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
1096 1097 1098 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
1099 1100 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
1101 1102 1103 |
} else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1104 |
if (info->attr.mq_curmsgs == 0) { |
2903ff019 switch simple cas... |
1105 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 |
spin_unlock(&info->lock); ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1108 1109 1110 1111 1112 1113 1114 |
} else { wait.task = current; wait.state = STATE_NONE; ret = wq_sleep(info, RECV, timeout, &wait); msg_ptr = wait.msg; } } else { |
fa6004ad4 ipc/mqueue: Imple... |
1115 |
WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1116 1117 1118 1119 1120 1121 |
msg_ptr = msg_get(info); inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; /* There is now free space in queue. */ |
fa6004ad4 ipc/mqueue: Imple... |
1122 |
pipelined_receive(&wake_q, info); |
1da177e4c Linux-2.6.12-rc2 |
1123 |
spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1124 |
wake_up_q(&wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 |
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... |
1137 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1138 1139 1140 1141 1142 1143 1144 1145 1146 |
out: return ret; } /* * 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. */ |
c4ea37c26 [CVE-2009-0029] S... |
1147 1148 |
SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification) |
1da177e4c Linux-2.6.12-rc2 |
1149 |
{ |
2903ff019 switch simple cas... |
1150 1151 |
int ret; struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 1154 1155 1156 |
struct sock *sock; struct inode *inode; struct sigevent notification; struct mqueue_inode_info *info; struct sk_buff *nc; |
20114f71b sanitize audit_mq... |
1157 |
if (u_notification) { |
1da177e4c Linux-2.6.12-rc2 |
1158 1159 1160 |
if (copy_from_user(¬ification, u_notification, sizeof(struct sigevent))) return -EFAULT; |
20114f71b sanitize audit_mq... |
1161 1162 1163 |
} audit_mq_notify(mqdes, u_notification ? ¬ification : NULL); |
1da177e4c Linux-2.6.12-rc2 |
1164 |
|
20114f71b sanitize audit_mq... |
1165 1166 1167 |
nc = NULL; sock = NULL; if (u_notification != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1168 1169 1170 1171 1172 |
if (unlikely(notification.sigev_notify != SIGEV_NONE && notification.sigev_notify != SIGEV_SIGNAL && notification.sigev_notify != SIGEV_THREAD)) return -EINVAL; if (notification.sigev_notify == SIGEV_SIGNAL && |
7ed20e1ad [PATCH] convert t... |
1173 |
!valid_signal(notification.sigev_signo)) { |
1da177e4c Linux-2.6.12-rc2 |
1174 1175 1176 |
return -EINVAL; } if (notification.sigev_notify == SIGEV_THREAD) { |
c3d8d1e30 [NETLINK]: Fix un... |
1177 |
long timeo; |
1da177e4c Linux-2.6.12-rc2 |
1178 1179 |
/* create the notify skb */ nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
8d8ffefaa mqueue: only set ... |
1180 1181 |
if (!nc) { ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1182 |
goto out; |
8d8ffefaa mqueue: only set ... |
1183 |
} |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 1186 |
if (copy_from_user(nc->data, notification.sigev_value.sival_ptr, NOTIFY_COOKIE_LEN)) { |
8d8ffefaa mqueue: only set ... |
1187 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1188 1189 1190 1191 1192 1193 1194 |
goto out; } /* TODO: add a header? */ skb_put(nc, NOTIFY_COOKIE_LEN); /* and attach it to the socket */ retry: |
2903ff019 switch simple cas... |
1195 1196 |
f = fdget(notification.sigev_signo); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1197 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1198 |
goto out; |
8d8ffefaa mqueue: only set ... |
1199 |
} |
2903ff019 switch simple cas... |
1200 1201 |
sock = netlink_getsockbyfilp(f.file); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 1204 1205 1206 |
if (IS_ERR(sock)) { ret = PTR_ERR(sock); sock = NULL; goto out; } |
c3d8d1e30 [NETLINK]: Fix un... |
1207 |
timeo = MAX_SCHEDULE_TIMEOUT; |
9457afee8 netlink: Remove n... |
1208 |
ret = netlink_attachskb(sock, nc, &timeo, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1209 |
if (ret == 1) |
8d8ffefaa mqueue: only set ... |
1210 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1211 1212 1213 1214 1215 1216 1217 |
if (ret) { sock = NULL; nc = NULL; goto out; } } } |
2903ff019 switch simple cas... |
1218 1219 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1220 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1221 |
goto out; |
8d8ffefaa mqueue: only set ... |
1222 |
} |
1da177e4c Linux-2.6.12-rc2 |
1223 |
|
496ad9aa8 new helper: file_... |
1224 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1225 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1226 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1227 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1228 |
} |
1da177e4c Linux-2.6.12-rc2 |
1229 1230 1231 1232 1233 |
info = MQUEUE_I(inode); ret = 0; spin_lock(&info->lock); if (u_notification == NULL) { |
a03fcb730 [PATCH] update mq... |
1234 |
if (info->notify_owner == task_tgid(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1235 1236 1237 |
remove_notification(info); inode->i_atime = inode->i_ctime = CURRENT_TIME; } |
a03fcb730 [PATCH] update mq... |
1238 |
} else if (info->notify_owner != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 |
ret = -EBUSY; } else { switch (notification.sigev_notify) { 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: info->notify.sigev_signo = notification.sigev_signo; info->notify.sigev_value = notification.sigev_value; info->notify.sigev_notify = SIGEV_SIGNAL; break; } |
a03fcb730 [PATCH] update mq... |
1258 1259 |
info->notify_owner = get_pid(task_tgid(current)); |
6f9ac6d93 mqueue: Explicitl... |
1260 |
info->notify_user_ns = get_user_ns(current_user_ns()); |
1da177e4c Linux-2.6.12-rc2 |
1261 1262 1263 1264 |
inode->i_atime = inode->i_ctime = CURRENT_TIME; } spin_unlock(&info->lock); out_fput: |
2903ff019 switch simple cas... |
1265 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1266 |
out: |
3ab08fe20 ipc: remove brace... |
1267 |
if (sock) |
1da177e4c Linux-2.6.12-rc2 |
1268 |
netlink_detachskb(sock, nc); |
3ab08fe20 ipc: remove brace... |
1269 |
else if (nc) |
1da177e4c Linux-2.6.12-rc2 |
1270 |
dev_kfree_skb(nc); |
3ab08fe20 ipc: remove brace... |
1271 |
|
1da177e4c Linux-2.6.12-rc2 |
1272 1273 |
return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
1274 1275 1276 |
SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct mq_attr __user *, u_mqstat, struct mq_attr __user *, u_omqstat) |
1da177e4c Linux-2.6.12-rc2 |
1277 1278 1279 |
{ int ret; struct mq_attr mqstat, omqstat; |
2903ff019 switch simple cas... |
1280 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1281 1282 1283 1284 1285 1286 1287 1288 1289 |
struct inode *inode; struct mqueue_inode_info *info; if (u_mqstat != NULL) { if (copy_from_user(&mqstat, u_mqstat, sizeof(struct mq_attr))) return -EFAULT; if (mqstat.mq_flags & (~O_NONBLOCK)) return -EINVAL; } |
2903ff019 switch simple cas... |
1290 1291 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1292 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1293 |
goto out; |
8d8ffefaa mqueue: only set ... |
1294 |
} |
1da177e4c Linux-2.6.12-rc2 |
1295 |
|
496ad9aa8 new helper: file_... |
1296 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1297 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1298 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1299 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1300 |
} |
1da177e4c Linux-2.6.12-rc2 |
1301 1302 1303 1304 1305 |
info = MQUEUE_I(inode); spin_lock(&info->lock); omqstat = info->attr; |
2903ff019 switch simple cas... |
1306 |
omqstat.mq_flags = f.file->f_flags & O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1307 |
if (u_mqstat) { |
7392906ea sanitize audit_mq... |
1308 |
audit_mq_getsetattr(mqdes, &mqstat); |
2903ff019 switch simple cas... |
1309 |
spin_lock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1310 |
if (mqstat.mq_flags & O_NONBLOCK) |
2903ff019 switch simple cas... |
1311 |
f.file->f_flags |= O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1312 |
else |
2903ff019 switch simple cas... |
1313 1314 |
f.file->f_flags &= ~O_NONBLOCK; spin_unlock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 |
inode->i_atime = inode->i_ctime = CURRENT_TIME; } spin_unlock(&info->lock); ret = 0; if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat, sizeof(struct mq_attr))) ret = -EFAULT; out_fput: |
2903ff019 switch simple cas... |
1327 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1328 1329 1330 |
out: return ret; } |
92e1d5be9 [PATCH] mark stru... |
1331 |
static const struct inode_operations mqueue_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1332 1333 1334 1335 |
.lookup = simple_lookup, .create = mqueue_create, .unlink = mqueue_unlink, }; |
9a32144e9 [PATCH] mark stru... |
1336 |
static const struct file_operations mqueue_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 |
.flush = mqueue_flush_file, .poll = mqueue_poll_file, .read = mqueue_read_file, |
6038f373a llseek: automatic... |
1340 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1341 |
}; |
b87221de6 const: mark remai... |
1342 |
static const struct super_operations mqueue_super_ops = { |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 |
.alloc_inode = mqueue_alloc_inode, .destroy_inode = mqueue_destroy_inode, |
6d8af64c1 switch mqueue to ... |
1345 |
.evict_inode = mqueue_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
1346 |
.statfs = simple_statfs, |
1da177e4c Linux-2.6.12-rc2 |
1347 1348 1349 1350 |
}; static struct file_system_type mqueue_fs_type = { .name = "mqueue", |
ceefda693 switch get_sb_ns(... |
1351 |
.mount = mqueue_mount, |
1da177e4c Linux-2.6.12-rc2 |
1352 |
.kill_sb = kill_litter_super, |
bc1b69ed2 userns: Allow the... |
1353 |
.fs_flags = FS_USERNS_MOUNT, |
1da177e4c Linux-2.6.12-rc2 |
1354 |
}; |
7eafd7c74 namespaces: ipc n... |
1355 1356 1357 1358 1359 1360 |
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 ... |
1361 1362 |
ns->mq_msg_default = DFLT_MSG; ns->mq_msgsize_default = DFLT_MSGSIZE; |
7eafd7c74 namespaces: ipc n... |
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
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; } return 0; } void mq_clear_sbinfo(struct ipc_namespace *ns) { ns->mq_mnt->mnt_sb->s_fs_info = NULL; } void mq_put_mnt(struct ipc_namespace *ns) { |
6f686574c ... and the same ... |
1380 |
kern_unmount(ns->mq_mnt); |
7eafd7c74 namespaces: ipc n... |
1381 |
} |
1da177e4c Linux-2.6.12-rc2 |
1382 1383 1384 1385 1386 1387 |
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... |
1388 |
SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 |
if (mqueue_inode_cachep == NULL) return -ENOMEM; |
2329e392a mqueue: fix typo ... |
1391 |
/* ignore failures - they are not fatal */ |
bdc8e5f85 namespaces: mqueu... |
1392 |
mq_sysctl_table = mq_register_sysctl_table(); |
1da177e4c Linux-2.6.12-rc2 |
1393 1394 1395 1396 |
error = register_filesystem(&mqueue_fs_type); if (error) goto out_sysctl; |
7eafd7c74 namespaces: ipc n... |
1397 |
spin_lock_init(&mq_lock); |
6f686574c ... and the same ... |
1398 1399 |
error = mq_init_ns(&init_ipc_ns); if (error) |
1da177e4c Linux-2.6.12-rc2 |
1400 |
goto out_filesystem; |
1da177e4c Linux-2.6.12-rc2 |
1401 |
|
1da177e4c Linux-2.6.12-rc2 |
1402 1403 1404 1405 1406 1407 1408 |
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... |
1409 |
kmem_cache_destroy(mqueue_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
1410 1411 |
return error; } |
6d08a2567 ipc: use device_i... |
1412 |
device_initcall(init_mqueue_fs); |