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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(); |
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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. */ 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 = 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 & MS_KERNMOUNT) { ns = data; data = NULL; } else { ns = current->nsproxy->ipc_ns; |
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} |
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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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} 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; |
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dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
431 432 433 434 |
d_instantiate(dentry, inode); dget(dentry); return 0; |
614b84cf4 namespaces: mqueu... |
435 |
out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
436 |
spin_unlock(&mq_lock); |
7eafd7c74 namespaces: ipc n... |
437 438 |
if (ipc_ns) put_ipc_ns(ipc_ns); |
1da177e4c Linux-2.6.12-rc2 |
439 440 441 442 443 |
return error; } static int mqueue_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
444 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
445 |
|
078cd8279 fs: Replace CURRE... |
446 |
dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
447 |
dir->i_size -= DIRENT_SIZE; |
239521f31 ipc: whitespace c... |
448 449 450 |
drop_nlink(inode); dput(dentry); return 0; |
1da177e4c Linux-2.6.12-rc2 |
451 452 453 454 455 456 457 458 459 460 |
} /* * 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... |
461 |
size_t count, loff_t *off) |
1da177e4c Linux-2.6.12-rc2 |
462 |
{ |
496ad9aa8 new helper: file_... |
463 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
464 |
char buffer[FILENT_SIZE]; |
f1a43f93f ipc: use simple_r... |
465 |
ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
466 467 468 469 470 471 472 473 474 475 |
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 ... |
476 |
pid_vnr(info->notify_owner)); |
1da177e4c Linux-2.6.12-rc2 |
477 478 |
spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; |
1da177e4c Linux-2.6.12-rc2 |
479 |
|
f1a43f93f ipc: use simple_r... |
480 481 482 483 |
ret = simple_read_from_buffer(u_data, count, off, buffer, strlen(buffer)); if (ret <= 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
484 |
|
078cd8279 fs: Replace CURRE... |
485 |
file_inode(filp)->i_atime = file_inode(filp)->i_ctime = current_time(file_inode(filp)); |
f1a43f93f ipc: use simple_r... |
486 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
487 |
} |
75e1fcc0b [PATCH] vfs: add ... |
488 |
static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
1da177e4c Linux-2.6.12-rc2 |
489 |
{ |
496ad9aa8 new helper: file_... |
490 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
491 492 |
spin_lock(&info->lock); |
a03fcb730 [PATCH] update mq... |
493 |
if (task_tgid(current) == info->notify_owner) |
1da177e4c Linux-2.6.12-rc2 |
494 495 496 497 498 499 500 501 |
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_... |
502 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
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... |
541 |
ktime_t *timeout, struct ext_wait_queue *ewp) |
1da177e4c Linux-2.6.12-rc2 |
542 543 544 545 546 547 548 |
{ int retval; signed long time; wq_add(info, sr, ewp); for (;;) { |
fa6004ad4 ipc/mqueue: Imple... |
549 |
__set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
550 551 |
spin_unlock(&info->lock); |
32ea845d5 ipc/mqueue.c: fix... |
552 553 |
time = schedule_hrtimeout_range_clock(timeout, 0, HRTIMER_MODE_ABS, CLOCK_REALTIME); |
1da177e4c Linux-2.6.12-rc2 |
554 |
|
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 |
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 |
593 594 595 |
static inline void set_cookie(struct sk_buff *skb, char code) { |
239521f31 ipc: whitespace c... |
596 |
((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
1da177e4c Linux-2.6.12-rc2 |
597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 |
} /* * 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... |
622 623 |
/* map current pid/uid into info->owner's namespaces */ rcu_read_lock(); |
a6684999f mqueue: fix si_pi... |
624 625 |
sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); |
76b6db010 userns: Replace u... |
626 |
sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid()); |
6b550f949 user namespace: m... |
627 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
628 |
|
a03fcb730 [PATCH] update mq... |
629 630 |
kill_pid_info(info->notify.sigev_signo, &sig_i, info->notify_owner); |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 |
break; case SIGEV_THREAD: set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
7ee015e0f [NET]: cleanup 3r... |
634 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
635 636 637 |
break; } /* after notification unregisters process */ |
a03fcb730 [PATCH] update mq... |
638 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
639 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
640 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
641 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
642 643 644 |
} wake_up(&info->wait_q); } |
9ca7d8e68 mqueue: Convert m... |
645 646 |
static int prepare_timeout(const struct timespec __user *u_abs_timeout, ktime_t *expires, struct timespec *ts) |
1da177e4c Linux-2.6.12-rc2 |
647 |
{ |
9ca7d8e68 mqueue: Convert m... |
648 649 650 651 |
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 |
652 |
|
9ca7d8e68 mqueue: Convert m... |
653 654 |
*expires = timespec_to_ktime(*ts); return 0; |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 |
} static void remove_notification(struct mqueue_inode_info *info) { |
a03fcb730 [PATCH] update mq... |
659 |
if (info->notify_owner != NULL && |
1da177e4c Linux-2.6.12-rc2 |
660 661 |
info->notify.sigev_notify == SIGEV_THREAD) { set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
7ee015e0f [NET]: cleanup 3r... |
662 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
663 |
} |
a03fcb730 [PATCH] update mq... |
664 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
665 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
666 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
667 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
668 |
} |
614b84cf4 namespaces: mqueu... |
669 |
static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
670 |
{ |
2c12ea498 ipc/mqueue: corre... |
671 672 |
int mq_treesize; unsigned long total_size; |
1da177e4c Linux-2.6.12-rc2 |
673 |
if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) |
113289cc0 ipc/mqueue: stren... |
674 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
675 |
if (capable(CAP_SYS_RESOURCE)) { |
02967ea08 ipc/mqueue: enfor... |
676 677 |
if (attr->mq_maxmsg > HARD_MSGMAX || attr->mq_msgsize > HARD_MSGSIZEMAX) |
113289cc0 ipc/mqueue: stren... |
678 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
679 |
} else { |
614b84cf4 namespaces: mqueu... |
680 681 |
if (attr->mq_maxmsg > ipc_ns->mq_msg_max || attr->mq_msgsize > ipc_ns->mq_msgsize_max) |
113289cc0 ipc/mqueue: stren... |
682 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
683 684 685 |
} /* check for overflow */ if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg) |
113289cc0 ipc/mqueue: stren... |
686 |
return -EOVERFLOW; |
2c12ea498 ipc/mqueue: corre... |
687 688 689 690 691 |
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... |
692 693 |
return -EOVERFLOW; return 0; |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 698 |
} /* * Invoked when creating a new queue via sys_mq_open */ |
765927b2d switch dentry_ope... |
699 700 |
static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir, struct path *path, int oflag, umode_t mode, |
614b84cf4 namespaces: mqueu... |
701 |
struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
702 |
{ |
745ca2475 CRED: Pass creden... |
703 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
704 |
int ret; |
564f6993f sanitize audit_mq... |
705 |
if (attr) { |
113289cc0 ipc/mqueue: stren... |
706 707 |
ret = mq_attr_ok(ipc_ns, attr); if (ret) |
765927b2d switch dentry_ope... |
708 |
return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
709 |
/* store for use during create */ |
765927b2d switch dentry_ope... |
710 |
path->dentry->d_fsdata = attr; |
113289cc0 ipc/mqueue: stren... |
711 712 713 714 715 716 717 718 719 |
} 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... |
720 |
return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
721 |
} |
ce3b0f8d5 New helper - curr... |
722 |
mode &= ~current_umask(); |
765927b2d switch dentry_ope... |
723 724 |
ret = vfs_create(dir, path->dentry, mode, true); path->dentry->d_fsdata = NULL; |
312b90fbe mqueue: lift mnt_... |
725 726 727 |
if (ret) return ERR_PTR(ret); return dentry_open(path, oflag, cred); |
1da177e4c Linux-2.6.12-rc2 |
728 729 730 |
} /* Opens existing queue */ |
765927b2d switch dentry_ope... |
731 |
static struct file *do_open(struct path *path, int oflag) |
1da177e4c Linux-2.6.12-rc2 |
732 |
{ |
745ca2475 CRED: Pass creden... |
733 734 |
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, MAY_READ | MAY_WRITE }; |
765927b2d switch dentry_ope... |
735 736 737 738 |
int acc; if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) return ERR_PTR(-EINVAL); acc = oflag2acc[oflag & O_ACCMODE]; |
75c3cfa85 VFS: assorted wei... |
739 |
if (inode_permission(d_inode(path->dentry), acc)) |
765927b2d switch dentry_ope... |
740 741 |
return ERR_PTR(-EACCES); return dentry_open(path, oflag, current_cred()); |
1da177e4c Linux-2.6.12-rc2 |
742 |
} |
df0a42837 switch mq_open() ... |
743 |
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, |
d5460c997 [CVE-2009-0029] S... |
744 |
struct mq_attr __user *, u_attr) |
1da177e4c Linux-2.6.12-rc2 |
745 |
{ |
765927b2d switch dentry_ope... |
746 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
747 |
struct file *filp; |
91a27b2a7 vfs: define struc... |
748 |
struct filename *name; |
564f6993f sanitize audit_mq... |
749 |
struct mq_attr attr; |
1da177e4c Linux-2.6.12-rc2 |
750 |
int fd, error; |
7eafd7c74 namespaces: ipc n... |
751 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
752 753 754 |
struct vfsmount *mnt = ipc_ns->mq_mnt; struct dentry *root = mnt->mnt_root; int ro; |
1da177e4c Linux-2.6.12-rc2 |
755 |
|
564f6993f sanitize audit_mq... |
756 757 758 759 |
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 ... |
760 |
|
1da177e4c Linux-2.6.12-rc2 |
761 762 |
if (IS_ERR(name = getname(u_name))) return PTR_ERR(name); |
269f21344 tiny mq_open opti... |
763 |
fd = get_unused_fd_flags(O_CLOEXEC); |
1da177e4c Linux-2.6.12-rc2 |
764 765 |
if (fd < 0) goto out_putname; |
312b90fbe mqueue: lift mnt_... |
766 |
ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
765927b2d switch dentry_ope... |
767 |
error = 0; |
5955102c9 wrappers for ->i_... |
768 |
inode_lock(d_inode(root)); |
91a27b2a7 vfs: define struc... |
769 |
path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
765927b2d switch dentry_ope... |
770 771 |
if (IS_ERR(path.dentry)) { error = PTR_ERR(path.dentry); |
4294a8eed mqueue: fix mq_op... |
772 |
goto out_putfd; |
1da177e4c Linux-2.6.12-rc2 |
773 |
} |
312b90fbe mqueue: lift mnt_... |
774 |
path.mnt = mntget(mnt); |
1da177e4c Linux-2.6.12-rc2 |
775 776 |
if (oflag & O_CREAT) { |
75c3cfa85 VFS: assorted wei... |
777 |
if (d_really_is_positive(path.dentry)) { /* entry already exists */ |
adb5c2473 audit: make audit... |
778 |
audit_inode(name, path.dentry, 0); |
8d8ffefaa mqueue: only set ... |
779 780 |
if (oflag & O_EXCL) { error = -EEXIST; |
7c7dce920 [PATCH] Fix doubl... |
781 |
goto out; |
8d8ffefaa mqueue: only set ... |
782 |
} |
765927b2d switch dentry_ope... |
783 |
filp = do_open(&path, oflag); |
1da177e4c Linux-2.6.12-rc2 |
784 |
} else { |
312b90fbe mqueue: lift mnt_... |
785 786 787 788 |
if (ro) { error = ro; goto out; } |
79f6530cb audit: fix mq_ope... |
789 |
audit_inode_parent_hidden(name, root); |
75c3cfa85 VFS: assorted wei... |
790 |
filp = do_create(ipc_ns, d_inode(root), |
765927b2d switch dentry_ope... |
791 |
&path, oflag, mode, |
564f6993f sanitize audit_mq... |
792 |
u_attr ? &attr : NULL); |
1da177e4c Linux-2.6.12-rc2 |
793 |
} |
7c7dce920 [PATCH] Fix doubl... |
794 |
} else { |
75c3cfa85 VFS: assorted wei... |
795 |
if (d_really_is_negative(path.dentry)) { |
8d8ffefaa mqueue: only set ... |
796 |
error = -ENOENT; |
7c7dce920 [PATCH] Fix doubl... |
797 |
goto out; |
8d8ffefaa mqueue: only set ... |
798 |
} |
adb5c2473 audit: make audit... |
799 |
audit_inode(name, path.dentry, 0); |
765927b2d switch dentry_ope... |
800 |
filp = do_open(&path, oflag); |
7c7dce920 [PATCH] Fix doubl... |
801 |
} |
1da177e4c Linux-2.6.12-rc2 |
802 |
|
765927b2d switch dentry_ope... |
803 804 805 |
if (!IS_ERR(filp)) fd_install(fd, filp); else |
1da177e4c Linux-2.6.12-rc2 |
806 |
error = PTR_ERR(filp); |
7c7dce920 [PATCH] Fix doubl... |
807 |
out: |
765927b2d switch dentry_ope... |
808 |
path_put(&path); |
7c7dce920 [PATCH] Fix doubl... |
809 |
out_putfd: |
765927b2d switch dentry_ope... |
810 811 812 813 |
if (error) { put_unused_fd(fd); fd = error; } |
5955102c9 wrappers for ->i_... |
814 |
inode_unlock(d_inode(root)); |
38d78e587 mqueue: sys_mq_op... |
815 816 |
if (!ro) mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
817 818 819 820 |
out_putname: putname(name); return fd; } |
d5460c997 [CVE-2009-0029] S... |
821 |
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
1da177e4c Linux-2.6.12-rc2 |
822 823 |
{ int err; |
91a27b2a7 vfs: define struc... |
824 |
struct filename *name; |
1da177e4c Linux-2.6.12-rc2 |
825 826 |
struct dentry *dentry; struct inode *inode = NULL; |
7eafd7c74 namespaces: ipc n... |
827 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
828 |
struct vfsmount *mnt = ipc_ns->mq_mnt; |
1da177e4c Linux-2.6.12-rc2 |
829 830 831 832 |
name = getname(u_name); if (IS_ERR(name)) return PTR_ERR(name); |
79f6530cb audit: fix mq_ope... |
833 |
audit_inode_parent_hidden(name, mnt->mnt_root); |
312b90fbe mqueue: lift mnt_... |
834 835 836 |
err = mnt_want_write(mnt); if (err) goto out_name; |
5955102c9 wrappers for ->i_... |
837 |
inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
91a27b2a7 vfs: define struc... |
838 839 |
dentry = lookup_one_len(name->name, mnt->mnt_root, strlen(name->name)); |
1da177e4c Linux-2.6.12-rc2 |
840 841 842 843 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_unlock; } |
75c3cfa85 VFS: assorted wei... |
844 |
inode = d_inode(dentry); |
312b90fbe mqueue: lift mnt_... |
845 846 847 |
if (!inode) { err = -ENOENT; } else { |
7de9c6ee3 new helper: ihold() |
848 |
ihold(inode); |
75c3cfa85 VFS: assorted wei... |
849 |
err = vfs_unlink(d_inode(dentry->d_parent), dentry, NULL); |
312b90fbe mqueue: lift mnt_... |
850 |
} |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 |
dput(dentry); out_unlock: |
5955102c9 wrappers for ->i_... |
854 |
inode_unlock(d_inode(mnt->mnt_root)); |
1da177e4c Linux-2.6.12-rc2 |
855 856 |
if (inode) iput(inode); |
312b90fbe mqueue: lift mnt_... |
857 858 859 |
mnt_drop_write(mnt); out_name: putname(name); |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 863 864 865 866 867 868 869 |
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... |
870 871 872 873 874 875 876 877 878 |
* 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 |
879 880 881 882 883 884 885 |
* * 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... |
886 887 |
static inline void pipelined_send(struct wake_q_head *wake_q, struct mqueue_inode_info *info, |
1da177e4c Linux-2.6.12-rc2 |
888 889 890 891 892 |
struct msg_msg *message, struct ext_wait_queue *receiver) { receiver->msg = message; list_del(&receiver->list); |
fa6004ad4 ipc/mqueue: Imple... |
893 894 895 896 897 898 899 900 901 |
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 |
902 903 904 905 906 |
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... |
907 908 |
static inline void pipelined_receive(struct wake_q_head *wake_q, struct mqueue_inode_info *info) |
1da177e4c Linux-2.6.12-rc2 |
909 910 911 912 913 914 915 916 |
{ 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... |
917 918 |
if (msg_insert(sender->msg, info)) return; |
fa6004ad4 ipc/mqueue: Imple... |
919 |
|
1da177e4c Linux-2.6.12-rc2 |
920 |
list_del(&sender->list); |
fa6004ad4 ipc/mqueue: Imple... |
921 |
wake_q_add(wake_q, sender->task); |
1da177e4c Linux-2.6.12-rc2 |
922 923 |
sender->state = STATE_READY; } |
c4ea37c26 [CVE-2009-0029] S... |
924 925 926 |
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 |
927 |
{ |
2903ff019 switch simple cas... |
928 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
929 930 931 932 933 |
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... |
934 935 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
ce2d52cc1 ipc/mqueue: add r... |
936 |
struct posix_msg_tree_node *new_leaf = NULL; |
2903ff019 switch simple cas... |
937 |
int ret = 0; |
fa6004ad4 ipc/mqueue: Imple... |
938 |
WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
939 |
|
c32c8af43 sanitize AUDIT_MQ... |
940 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
941 942 943 944 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
945 |
} |
20ca73bc7 [PATCH] Audit of ... |
946 |
|
1da177e4c Linux-2.6.12-rc2 |
947 948 |
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) return -EINVAL; |
9ca7d8e68 mqueue: Convert m... |
949 |
audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
950 |
|
2903ff019 switch simple cas... |
951 952 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
953 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
954 |
goto out; |
8d8ffefaa mqueue: only set ... |
955 |
} |
1da177e4c Linux-2.6.12-rc2 |
956 |
|
496ad9aa8 new helper: file_... |
957 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
958 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
959 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
960 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
961 |
} |
1da177e4c Linux-2.6.12-rc2 |
962 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
963 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
964 |
|
2903ff019 switch simple cas... |
965 |
if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
8d8ffefaa mqueue: only set ... |
966 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
967 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
968 |
} |
1da177e4c Linux-2.6.12-rc2 |
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 |
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... |
984 985 986 987 988 989 990 |
/* * 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 |
991 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
992 993 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
994 995 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
996 997 998 999 |
new_leaf = NULL; } else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1000 |
if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
2903ff019 switch simple cas... |
1001 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1002 |
ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 |
} 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... |
1008 1009 1010 1011 1012 |
/* * wq_sleep must be called with info->lock held, and * returns with the lock released */ goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
1013 |
} |
1da177e4c Linux-2.6.12-rc2 |
1014 1015 1016 |
} else { receiver = wq_get_first_waiter(info, RECV); if (receiver) { |
fa6004ad4 ipc/mqueue: Imple... |
1017 |
pipelined_send(&wake_q, info, msg_ptr, receiver); |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 |
} else { /* adds message to the queue */ |
ce2d52cc1 ipc/mqueue: add r... |
1020 1021 1022 |
ret = msg_insert(msg_ptr, info); if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1023 1024 1025 |
__do_notify(info); } inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
1026 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1027 |
} |
ce2d52cc1 ipc/mqueue: add r... |
1028 1029 |
out_unlock: spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1030 |
wake_up_q(&wake_q); |
ce2d52cc1 ipc/mqueue: add r... |
1031 1032 1033 |
out_free: if (ret) free_msg(msg_ptr); |
1da177e4c Linux-2.6.12-rc2 |
1034 |
out_fput: |
2903ff019 switch simple cas... |
1035 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 |
out: return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
1039 1040 1041 |
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 |
1042 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1043 1044 |
ssize_t ret; struct msg_msg *msg_ptr; |
2903ff019 switch simple cas... |
1045 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 1048 |
struct inode *inode; struct mqueue_inode_info *info; struct ext_wait_queue wait; |
9ca7d8e68 mqueue: Convert m... |
1049 1050 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
ce2d52cc1 ipc/mqueue: add r... |
1051 |
struct posix_msg_tree_node *new_leaf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1052 |
|
c32c8af43 sanitize AUDIT_MQ... |
1053 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
1054 1055 1056 1057 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
1058 |
} |
20ca73bc7 [PATCH] Audit of ... |
1059 |
|
9ca7d8e68 mqueue: Convert m... |
1060 |
audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
1061 |
|
2903ff019 switch simple cas... |
1062 1063 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
1064 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1065 |
goto out; |
8d8ffefaa mqueue: only set ... |
1066 |
} |
1da177e4c Linux-2.6.12-rc2 |
1067 |
|
496ad9aa8 new helper: file_... |
1068 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1069 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1070 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1071 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1072 |
} |
1da177e4c Linux-2.6.12-rc2 |
1073 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
1074 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
1075 |
|
2903ff019 switch simple cas... |
1076 |
if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
8d8ffefaa mqueue: only set ... |
1077 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1078 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1079 |
} |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 1083 1084 1085 |
/* checks if buffer is big enough */ if (unlikely(msg_len < info->attr.mq_msgsize)) { ret = -EMSGSIZE; goto out_fput; } |
ce2d52cc1 ipc/mqueue: add r... |
1086 1087 1088 1089 1090 1091 1092 |
/* * 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 |
1093 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
1094 1095 1096 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
1097 1098 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
1099 1100 1101 |
} else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1102 |
if (info->attr.mq_curmsgs == 0) { |
2903ff019 switch simple cas... |
1103 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1104 1105 |
spin_unlock(&info->lock); ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 1108 1109 1110 1111 1112 |
} else { wait.task = current; wait.state = STATE_NONE; ret = wq_sleep(info, RECV, timeout, &wait); msg_ptr = wait.msg; } } else { |
fa6004ad4 ipc/mqueue: Imple... |
1113 |
WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1114 1115 1116 |
msg_ptr = msg_get(info); inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
1117 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1118 1119 |
/* There is now free space in queue. */ |
fa6004ad4 ipc/mqueue: Imple... |
1120 |
pipelined_receive(&wake_q, info); |
1da177e4c Linux-2.6.12-rc2 |
1121 |
spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1122 |
wake_up_q(&wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 |
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... |
1135 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 1139 1140 1141 1142 1143 1144 |
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... |
1145 1146 |
SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification) |
1da177e4c Linux-2.6.12-rc2 |
1147 |
{ |
2903ff019 switch simple cas... |
1148 1149 |
int ret; struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1150 1151 1152 1153 1154 |
struct sock *sock; struct inode *inode; struct sigevent notification; struct mqueue_inode_info *info; struct sk_buff *nc; |
20114f71b sanitize audit_mq... |
1155 |
if (u_notification) { |
1da177e4c Linux-2.6.12-rc2 |
1156 1157 1158 |
if (copy_from_user(¬ification, u_notification, sizeof(struct sigevent))) return -EFAULT; |
20114f71b sanitize audit_mq... |
1159 1160 1161 |
} audit_mq_notify(mqdes, u_notification ? ¬ification : NULL); |
1da177e4c Linux-2.6.12-rc2 |
1162 |
|
20114f71b sanitize audit_mq... |
1163 1164 1165 |
nc = NULL; sock = NULL; if (u_notification != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 1168 1169 1170 |
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... |
1171 |
!valid_signal(notification.sigev_signo)) { |
1da177e4c Linux-2.6.12-rc2 |
1172 1173 1174 |
return -EINVAL; } if (notification.sigev_notify == SIGEV_THREAD) { |
c3d8d1e30 [NETLINK]: Fix un... |
1175 |
long timeo; |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 |
/* create the notify skb */ nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
8d8ffefaa mqueue: only set ... |
1178 1179 |
if (!nc) { ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1180 |
goto out; |
8d8ffefaa mqueue: only set ... |
1181 |
} |
1da177e4c Linux-2.6.12-rc2 |
1182 1183 1184 |
if (copy_from_user(nc->data, notification.sigev_value.sival_ptr, NOTIFY_COOKIE_LEN)) { |
8d8ffefaa mqueue: only set ... |
1185 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1186 1187 1188 1189 1190 1191 1192 |
goto out; } /* TODO: add a header? */ skb_put(nc, NOTIFY_COOKIE_LEN); /* and attach it to the socket */ retry: |
2903ff019 switch simple cas... |
1193 1194 |
f = fdget(notification.sigev_signo); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1195 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1196 |
goto out; |
8d8ffefaa mqueue: only set ... |
1197 |
} |
2903ff019 switch simple cas... |
1198 1199 |
sock = netlink_getsockbyfilp(f.file); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1200 1201 1202 1203 1204 |
if (IS_ERR(sock)) { ret = PTR_ERR(sock); sock = NULL; goto out; } |
c3d8d1e30 [NETLINK]: Fix un... |
1205 |
timeo = MAX_SCHEDULE_TIMEOUT; |
9457afee8 netlink: Remove n... |
1206 |
ret = netlink_attachskb(sock, nc, &timeo, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1207 |
if (ret == 1) |
8d8ffefaa mqueue: only set ... |
1208 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1209 1210 1211 1212 1213 1214 1215 |
if (ret) { sock = NULL; nc = NULL; goto out; } } } |
2903ff019 switch simple cas... |
1216 1217 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1218 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1219 |
goto out; |
8d8ffefaa mqueue: only set ... |
1220 |
} |
1da177e4c Linux-2.6.12-rc2 |
1221 |
|
496ad9aa8 new helper: file_... |
1222 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1223 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1224 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1225 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1226 |
} |
1da177e4c Linux-2.6.12-rc2 |
1227 1228 1229 1230 1231 |
info = MQUEUE_I(inode); ret = 0; spin_lock(&info->lock); if (u_notification == NULL) { |
a03fcb730 [PATCH] update mq... |
1232 |
if (info->notify_owner == task_tgid(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1233 |
remove_notification(info); |
078cd8279 fs: Replace CURRE... |
1234 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1235 |
} |
a03fcb730 [PATCH] update mq... |
1236 |
} else if (info->notify_owner != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 |
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... |
1256 1257 |
info->notify_owner = get_pid(task_tgid(current)); |
6f9ac6d93 mqueue: Explicitl... |
1258 |
info->notify_user_ns = get_user_ns(current_user_ns()); |
078cd8279 fs: Replace CURRE... |
1259 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1260 1261 1262 |
} spin_unlock(&info->lock); out_fput: |
2903ff019 switch simple cas... |
1263 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1264 |
out: |
3ab08fe20 ipc: remove brace... |
1265 |
if (sock) |
1da177e4c Linux-2.6.12-rc2 |
1266 |
netlink_detachskb(sock, nc); |
3ab08fe20 ipc: remove brace... |
1267 |
else if (nc) |
1da177e4c Linux-2.6.12-rc2 |
1268 |
dev_kfree_skb(nc); |
3ab08fe20 ipc: remove brace... |
1269 |
|
1da177e4c Linux-2.6.12-rc2 |
1270 1271 |
return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
1272 1273 1274 |
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 |
1275 1276 1277 |
{ int ret; struct mq_attr mqstat, omqstat; |
2903ff019 switch simple cas... |
1278 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1279 1280 1281 1282 1283 1284 1285 1286 1287 |
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... |
1288 1289 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1290 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1291 |
goto out; |
8d8ffefaa mqueue: only set ... |
1292 |
} |
1da177e4c Linux-2.6.12-rc2 |
1293 |
|
496ad9aa8 new helper: file_... |
1294 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1295 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1296 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1297 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1298 |
} |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 |
info = MQUEUE_I(inode); spin_lock(&info->lock); omqstat = info->attr; |
2903ff019 switch simple cas... |
1304 |
omqstat.mq_flags = f.file->f_flags & O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1305 |
if (u_mqstat) { |
7392906ea sanitize audit_mq... |
1306 |
audit_mq_getsetattr(mqdes, &mqstat); |
2903ff019 switch simple cas... |
1307 |
spin_lock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1308 |
if (mqstat.mq_flags & O_NONBLOCK) |
2903ff019 switch simple cas... |
1309 |
f.file->f_flags |= O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1310 |
else |
2903ff019 switch simple cas... |
1311 1312 |
f.file->f_flags &= ~O_NONBLOCK; spin_unlock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1313 |
|
078cd8279 fs: Replace CURRE... |
1314 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 |
} 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... |
1325 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1326 1327 1328 |
out: return ret; } |
92e1d5be9 [PATCH] mark stru... |
1329 |
static const struct inode_operations mqueue_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 1333 |
.lookup = simple_lookup, .create = mqueue_create, .unlink = mqueue_unlink, }; |
9a32144e9 [PATCH] mark stru... |
1334 |
static const struct file_operations mqueue_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1335 1336 1337 |
.flush = mqueue_flush_file, .poll = mqueue_poll_file, .read = mqueue_read_file, |
6038f373a llseek: automatic... |
1338 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1339 |
}; |
b87221de6 const: mark remai... |
1340 |
static const struct super_operations mqueue_super_ops = { |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 |
.alloc_inode = mqueue_alloc_inode, .destroy_inode = mqueue_destroy_inode, |
6d8af64c1 switch mqueue to ... |
1343 |
.evict_inode = mqueue_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
1344 |
.statfs = simple_statfs, |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 1347 1348 |
}; static struct file_system_type mqueue_fs_type = { .name = "mqueue", |
ceefda693 switch get_sb_ns(... |
1349 |
.mount = mqueue_mount, |
1da177e4c Linux-2.6.12-rc2 |
1350 |
.kill_sb = kill_litter_super, |
bc1b69ed2 userns: Allow the... |
1351 |
.fs_flags = FS_USERNS_MOUNT, |
1da177e4c Linux-2.6.12-rc2 |
1352 |
}; |
7eafd7c74 namespaces: ipc n... |
1353 1354 1355 1356 1357 1358 |
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 ... |
1359 1360 |
ns->mq_msg_default = DFLT_MSG; ns->mq_msgsize_default = DFLT_MSGSIZE; |
7eafd7c74 namespaces: ipc n... |
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 |
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 ... |
1378 |
kern_unmount(ns->mq_mnt); |
7eafd7c74 namespaces: ipc n... |
1379 |
} |
1da177e4c Linux-2.6.12-rc2 |
1380 1381 1382 1383 1384 1385 |
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... |
1386 |
SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
1da177e4c Linux-2.6.12-rc2 |
1387 1388 |
if (mqueue_inode_cachep == NULL) return -ENOMEM; |
2329e392a mqueue: fix typo ... |
1389 |
/* ignore failures - they are not fatal */ |
bdc8e5f85 namespaces: mqueu... |
1390 |
mq_sysctl_table = mq_register_sysctl_table(); |
1da177e4c Linux-2.6.12-rc2 |
1391 1392 1393 1394 |
error = register_filesystem(&mqueue_fs_type); if (error) goto out_sysctl; |
7eafd7c74 namespaces: ipc n... |
1395 |
spin_lock_init(&mq_lock); |
6f686574c ... and the same ... |
1396 1397 |
error = mq_init_ns(&init_ipc_ns); if (error) |
1da177e4c Linux-2.6.12-rc2 |
1398 |
goto out_filesystem; |
1da177e4c Linux-2.6.12-rc2 |
1399 |
|
1da177e4c Linux-2.6.12-rc2 |
1400 1401 1402 1403 1404 1405 1406 |
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... |
1407 |
kmem_cache_destroy(mqueue_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
1408 1409 |
return error; } |
6d08a2567 ipc: use device_i... |
1410 |
device_initcall(init_mqueue_fs); |