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ipc/mqueue.c
40.1 KB
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/* * POSIX message queues filesystem for Linux. * * Copyright (C) 2003,2004 Krzysztof Benedyczak (golbi@mat.uni.torun.pl) |
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* Michal Wronski (michal.wronski@gmail.com) |
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* * Spinlocks: Mohamed Abbas (abbas.mohamed@intel.com) * Lockless receive & send, fd based notify: |
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* Manfred Spraul (manfred@colorfullife.com) |
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* |
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* Audit: George Wilson (ltcgcw@us.ibm.com) * |
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* This file is released under the GPL. */ |
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#include <linux/capability.h> |
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#include <linux/init.h> #include <linux/pagemap.h> #include <linux/file.h> #include <linux/mount.h> #include <linux/namei.h> #include <linux/sysctl.h> #include <linux/poll.h> #include <linux/mqueue.h> #include <linux/msg.h> #include <linux/skbuff.h> |
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#include <linux/vmalloc.h> |
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#include <linux/netlink.h> #include <linux/syscalls.h> |
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#include <linux/audit.h> |
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#include <linux/signal.h> |
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#include <linux/mutex.h> |
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#include <linux/nsproxy.h> #include <linux/pid.h> |
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#include <linux/ipc_namespace.h> |
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#include <linux/user_namespace.h> |
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#include <linux/slab.h> |
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#include <linux/sched/wake_q.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/user.h> |
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|
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#include <net/sock.h> #include "util.h" #define MQUEUE_MAGIC 0x19800202 #define DIRENT_SIZE 20 #define FILENT_SIZE 80 #define SEND 0 #define RECV 1 #define STATE_NONE 0 |
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#define STATE_READY 1 |
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|
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struct posix_msg_tree_node { struct rb_node rb_node; struct list_head msg_list; int priority; }; |
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struct ext_wait_queue { /* queue of sleeping tasks */ struct task_struct *task; struct list_head list; struct msg_msg *msg; /* ptr of loaded message */ int state; /* one of STATE_* values */ }; struct mqueue_inode_info { spinlock_t lock; struct inode vfs_inode; wait_queue_head_t wait_q; |
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struct rb_root msg_tree; |
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struct posix_msg_tree_node *node_cache; |
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struct mq_attr attr; struct sigevent notify; |
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struct pid *notify_owner; |
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struct user_namespace *notify_user_ns; |
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struct user_struct *user; /* user who created, for accounting */ |
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struct sock *notify_sock; struct sk_buff *notify_cookie; /* for tasks waiting for free space and messages, respectively */ struct ext_wait_queue e_wait_q[2]; unsigned long qsize; /* size of queue in memory (sum of all msgs) */ }; |
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static const struct inode_operations mqueue_dir_inode_operations; |
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static const struct file_operations mqueue_file_operations; |
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static const struct super_operations mqueue_super_ops; |
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static void remove_notification(struct mqueue_inode_info *info); |
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static struct kmem_cache *mqueue_inode_cachep; |
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|
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static struct ctl_table_header *mq_sysctl_table; |
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static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode) { return container_of(inode, struct mqueue_inode_info, vfs_inode); } |
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/* * This routine should be called with the mq_lock held. */ static inline struct ipc_namespace *__get_ns_from_inode(struct inode *inode) |
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{ |
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return get_ipc_ns(inode->i_sb->s_fs_info); |
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} |
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static struct ipc_namespace *get_ns_from_inode(struct inode *inode) |
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{ |
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struct ipc_namespace *ns; spin_lock(&mq_lock); ns = __get_ns_from_inode(inode); spin_unlock(&mq_lock); return ns; |
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} |
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/* Auxiliary functions to manipulate messages' list */ static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info) { struct rb_node **p, *parent = NULL; struct posix_msg_tree_node *leaf; p = &info->msg_tree.rb_node; while (*p) { parent = *p; leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); if (likely(leaf->priority == msg->m_type)) goto insert_msg; else if (msg->m_type < leaf->priority) p = &(*p)->rb_left; else p = &(*p)->rb_right; } |
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if (info->node_cache) { leaf = info->node_cache; info->node_cache = NULL; } else { leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC); if (!leaf) return -ENOMEM; |
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INIT_LIST_HEAD(&leaf->msg_list); |
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} |
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leaf->priority = msg->m_type; rb_link_node(&leaf->rb_node, parent, p); rb_insert_color(&leaf->rb_node, &info->msg_tree); |
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insert_msg: info->attr.mq_curmsgs++; info->qsize += msg->m_ts; list_add_tail(&msg->m_list, &leaf->msg_list); return 0; } static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) { struct rb_node **p, *parent = NULL; struct posix_msg_tree_node *leaf; struct msg_msg *msg; try_again: p = &info->msg_tree.rb_node; while (*p) { parent = *p; /* * During insert, low priorities go to the left and high to the * right. On receive, we want the highest priorities first, so * walk all the way to the right. */ p = &(*p)->rb_right; } if (!parent) { if (info->attr.mq_curmsgs) { pr_warn_once("Inconsistency in POSIX message queue, " "no tree element, but supposedly messages " "should exist! "); info->attr.mq_curmsgs = 0; } return NULL; } leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
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if (unlikely(list_empty(&leaf->msg_list))) { |
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pr_warn_once("Inconsistency in POSIX message queue, " "empty leaf node but we haven't implemented " "lazy leaf delete! "); rb_erase(&leaf->rb_node, &info->msg_tree); |
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if (info->node_cache) { |
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kfree(leaf); } else { info->node_cache = leaf; } |
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goto try_again; } else { msg = list_first_entry(&leaf->msg_list, struct msg_msg, m_list); list_del(&msg->m_list); if (list_empty(&leaf->msg_list)) { rb_erase(&leaf->rb_node, &info->msg_tree); |
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if (info->node_cache) { |
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kfree(leaf); } else { info->node_cache = leaf; } |
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} } info->attr.mq_curmsgs--; info->qsize -= msg->m_ts; return msg; } |
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static struct inode *mqueue_get_inode(struct super_block *sb, |
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struct ipc_namespace *ipc_ns, umode_t mode, |
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struct mq_attr *attr) |
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{ |
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struct user_struct *u = current_user(); |
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struct inode *inode; |
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int ret = -ENOMEM; |
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inode = new_inode(sb); |
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if (!inode) goto err; inode->i_ino = get_next_ino(); inode->i_mode = mode; inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); |
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inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode); |
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if (S_ISREG(mode)) { struct mqueue_inode_info *info; |
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unsigned long mq_bytes, mq_treesize; |
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inode->i_fop = &mqueue_file_operations; inode->i_size = FILENT_SIZE; /* mqueue specific info */ info = MQUEUE_I(inode); spin_lock_init(&info->lock); init_waitqueue_head(&info->wait_q); INIT_LIST_HEAD(&info->e_wait_q[0].list); INIT_LIST_HEAD(&info->e_wait_q[1].list); info->notify_owner = NULL; |
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info->notify_user_ns = NULL; |
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info->qsize = 0; info->user = NULL; /* set when all is ok */ |
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info->msg_tree = RB_ROOT; |
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info->node_cache = NULL; |
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memset(&info->attr, 0, sizeof(info->attr)); |
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info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, ipc_ns->mq_msg_default); info->attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, ipc_ns->mq_msgsize_default); |
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if (attr) { info->attr.mq_maxmsg = attr->mq_maxmsg; info->attr.mq_msgsize = attr->mq_msgsize; } |
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/* * We used to allocate a static array of pointers and account * the size of that array as well as one msg_msg struct per * possible message into the queue size. That's no longer * accurate as the queue is now an rbtree and will grow and * shrink depending on usage patterns. We can, however, still * account one msg_msg struct per message, but the nodes are * allocated depending on priority usage, and most programs * only use one, or a handful, of priorities. However, since * this is pinned memory, we need to assume worst case, so * that means the min(mq_maxmsg, max_priorities) * struct * posix_msg_tree_node. */ 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); |
1da177e4c Linux-2.6.12-rc2 |
432 |
dir->i_size += DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
433 |
dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
434 435 436 437 |
d_instantiate(dentry, inode); dget(dentry); return 0; |
614b84cf4 namespaces: mqueu... |
438 |
out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
439 |
spin_unlock(&mq_lock); |
7eafd7c74 namespaces: ipc n... |
440 441 |
if (ipc_ns) put_ipc_ns(ipc_ns); |
1da177e4c Linux-2.6.12-rc2 |
442 443 444 445 446 |
return error; } static int mqueue_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
447 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
448 |
|
078cd8279 fs: Replace CURRE... |
449 |
dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
450 |
dir->i_size -= DIRENT_SIZE; |
239521f31 ipc: whitespace c... |
451 452 453 |
drop_nlink(inode); dput(dentry); return 0; |
1da177e4c Linux-2.6.12-rc2 |
454 455 456 457 458 459 460 461 462 463 |
} /* * 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... |
464 |
size_t count, loff_t *off) |
1da177e4c Linux-2.6.12-rc2 |
465 |
{ |
496ad9aa8 new helper: file_... |
466 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
467 |
char buffer[FILENT_SIZE]; |
f1a43f93f ipc: use simple_r... |
468 |
ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
469 470 471 472 473 474 475 476 477 478 |
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 ... |
479 |
pid_vnr(info->notify_owner)); |
1da177e4c Linux-2.6.12-rc2 |
480 481 |
spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; |
1da177e4c Linux-2.6.12-rc2 |
482 |
|
f1a43f93f ipc: use simple_r... |
483 484 485 486 |
ret = simple_read_from_buffer(u_data, count, off, buffer, strlen(buffer)); if (ret <= 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
487 |
|
078cd8279 fs: Replace CURRE... |
488 |
file_inode(filp)->i_atime = file_inode(filp)->i_ctime = current_time(file_inode(filp)); |
f1a43f93f ipc: use simple_r... |
489 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
490 |
} |
75e1fcc0b [PATCH] vfs: add ... |
491 |
static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
1da177e4c Linux-2.6.12-rc2 |
492 |
{ |
496ad9aa8 new helper: file_... |
493 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
494 495 |
spin_lock(&info->lock); |
a03fcb730 [PATCH] update mq... |
496 |
if (task_tgid(current) == info->notify_owner) |
1da177e4c Linux-2.6.12-rc2 |
497 498 499 500 501 502 503 504 |
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_... |
505 |
struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 |
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... |
544 |
ktime_t *timeout, struct ext_wait_queue *ewp) |
eac0b1c36 ipc/mqueue: add m... |
545 |
__releases(&info->lock) |
1da177e4c Linux-2.6.12-rc2 |
546 547 548 549 550 551 552 |
{ int retval; signed long time; wq_add(info, sr, ewp); for (;;) { |
fa6004ad4 ipc/mqueue: Imple... |
553 |
__set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
554 555 |
spin_unlock(&info->lock); |
32ea845d5 ipc/mqueue.c: fix... |
556 557 |
time = schedule_hrtimeout_range_clock(timeout, 0, HRTIMER_MODE_ABS, CLOCK_REALTIME); |
1da177e4c Linux-2.6.12-rc2 |
558 |
|
1da177e4c Linux-2.6.12-rc2 |
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 |
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 |
597 598 599 |
static inline void set_cookie(struct sk_buff *skb, char code) { |
239521f31 ipc: whitespace c... |
600 |
((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
1da177e4c Linux-2.6.12-rc2 |
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 |
} /* * 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... |
626 627 |
/* map current pid/uid into info->owner's namespaces */ rcu_read_lock(); |
a6684999f mqueue: fix si_pi... |
628 629 |
sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); |
76b6db010 userns: Replace u... |
630 |
sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid()); |
6b550f949 user namespace: m... |
631 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
632 |
|
a03fcb730 [PATCH] update mq... |
633 634 |
kill_pid_info(info->notify.sigev_signo, &sig_i, info->notify_owner); |
1da177e4c Linux-2.6.12-rc2 |
635 636 637 |
break; case SIGEV_THREAD: set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
7ee015e0f [NET]: cleanup 3r... |
638 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
639 640 641 |
break; } /* after notification unregisters process */ |
a03fcb730 [PATCH] update mq... |
642 |
put_pid(info->notify_owner); |
6f9ac6d93 mqueue: Explicitl... |
643 |
put_user_ns(info->notify_user_ns); |
a03fcb730 [PATCH] update mq... |
644 |
info->notify_owner = NULL; |
6f9ac6d93 mqueue: Explicitl... |
645 |
info->notify_user_ns = NULL; |
1da177e4c Linux-2.6.12-rc2 |
646 647 648 |
} wake_up(&info->wait_q); } |
9ca7d8e68 mqueue: Convert m... |
649 |
static int prepare_timeout(const struct timespec __user *u_abs_timeout, |
b90477263 ipc: mqueue: Repl... |
650 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
651 |
{ |
b90477263 ipc: mqueue: Repl... |
652 |
if (get_timespec64(ts, u_abs_timeout)) |
9ca7d8e68 mqueue: Convert m... |
653 |
return -EFAULT; |
b90477263 ipc: mqueue: Repl... |
654 |
if (!timespec64_valid(ts)) |
9ca7d8e68 mqueue: Convert m... |
655 |
return -EINVAL; |
9ca7d8e68 mqueue: Convert m... |
656 |
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 |
} |
0d0606060 mqueue: move comp... |
745 746 |
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
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; |
1da177e4c Linux-2.6.12-rc2 |
751 |
int fd, error; |
7eafd7c74 namespaces: ipc n... |
752 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
753 754 755 |
struct vfsmount *mnt = ipc_ns->mq_mnt; struct dentry *root = mnt->mnt_root; int ro; |
1da177e4c Linux-2.6.12-rc2 |
756 |
|
0d0606060 mqueue: move comp... |
757 |
audit_mq_open(oflag, mode, attr); |
20ca73bc7 [PATCH] Audit of ... |
758 |
|
1da177e4c Linux-2.6.12-rc2 |
759 760 |
if (IS_ERR(name = getname(u_name))) return PTR_ERR(name); |
269f21344 tiny mq_open opti... |
761 |
fd = get_unused_fd_flags(O_CLOEXEC); |
1da177e4c Linux-2.6.12-rc2 |
762 763 |
if (fd < 0) goto out_putname; |
312b90fbe mqueue: lift mnt_... |
764 |
ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
765927b2d switch dentry_ope... |
765 |
error = 0; |
5955102c9 wrappers for ->i_... |
766 |
inode_lock(d_inode(root)); |
91a27b2a7 vfs: define struc... |
767 |
path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
765927b2d switch dentry_ope... |
768 769 |
if (IS_ERR(path.dentry)) { error = PTR_ERR(path.dentry); |
4294a8eed mqueue: fix mq_op... |
770 |
goto out_putfd; |
1da177e4c Linux-2.6.12-rc2 |
771 |
} |
312b90fbe mqueue: lift mnt_... |
772 |
path.mnt = mntget(mnt); |
1da177e4c Linux-2.6.12-rc2 |
773 774 |
if (oflag & O_CREAT) { |
75c3cfa85 VFS: assorted wei... |
775 |
if (d_really_is_positive(path.dentry)) { /* entry already exists */ |
adb5c2473 audit: make audit... |
776 |
audit_inode(name, path.dentry, 0); |
8d8ffefaa mqueue: only set ... |
777 778 |
if (oflag & O_EXCL) { error = -EEXIST; |
7c7dce920 [PATCH] Fix doubl... |
779 |
goto out; |
8d8ffefaa mqueue: only set ... |
780 |
} |
765927b2d switch dentry_ope... |
781 |
filp = do_open(&path, oflag); |
1da177e4c Linux-2.6.12-rc2 |
782 |
} else { |
312b90fbe mqueue: lift mnt_... |
783 784 785 786 |
if (ro) { error = ro; goto out; } |
79f6530cb audit: fix mq_ope... |
787 |
audit_inode_parent_hidden(name, root); |
0d0606060 mqueue: move comp... |
788 789 |
filp = do_create(ipc_ns, d_inode(root), &path, oflag, mode, attr); |
1da177e4c Linux-2.6.12-rc2 |
790 |
} |
7c7dce920 [PATCH] Fix doubl... |
791 |
} else { |
75c3cfa85 VFS: assorted wei... |
792 |
if (d_really_is_negative(path.dentry)) { |
8d8ffefaa mqueue: only set ... |
793 |
error = -ENOENT; |
7c7dce920 [PATCH] Fix doubl... |
794 |
goto out; |
8d8ffefaa mqueue: only set ... |
795 |
} |
adb5c2473 audit: make audit... |
796 |
audit_inode(name, path.dentry, 0); |
765927b2d switch dentry_ope... |
797 |
filp = do_open(&path, oflag); |
7c7dce920 [PATCH] Fix doubl... |
798 |
} |
1da177e4c Linux-2.6.12-rc2 |
799 |
|
765927b2d switch dentry_ope... |
800 801 802 |
if (!IS_ERR(filp)) fd_install(fd, filp); else |
1da177e4c Linux-2.6.12-rc2 |
803 |
error = PTR_ERR(filp); |
7c7dce920 [PATCH] Fix doubl... |
804 |
out: |
765927b2d switch dentry_ope... |
805 |
path_put(&path); |
7c7dce920 [PATCH] Fix doubl... |
806 |
out_putfd: |
765927b2d switch dentry_ope... |
807 808 809 810 |
if (error) { put_unused_fd(fd); fd = error; } |
5955102c9 wrappers for ->i_... |
811 |
inode_unlock(d_inode(root)); |
38d78e587 mqueue: sys_mq_op... |
812 813 |
if (!ro) mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
814 815 816 817 |
out_putname: putname(name); return fd; } |
0d0606060 mqueue: move comp... |
818 819 820 821 822 823 824 825 826 |
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, struct mq_attr __user *, u_attr) { struct mq_attr attr; if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) return -EFAULT; return do_mq_open(u_name, oflag, mode, u_attr ? &attr : NULL); } |
d5460c997 [CVE-2009-0029] S... |
827 |
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
1da177e4c Linux-2.6.12-rc2 |
828 829 |
{ int err; |
91a27b2a7 vfs: define struc... |
830 |
struct filename *name; |
1da177e4c Linux-2.6.12-rc2 |
831 832 |
struct dentry *dentry; struct inode *inode = NULL; |
7eafd7c74 namespaces: ipc n... |
833 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
312b90fbe mqueue: lift mnt_... |
834 |
struct vfsmount *mnt = ipc_ns->mq_mnt; |
1da177e4c Linux-2.6.12-rc2 |
835 836 837 838 |
name = getname(u_name); if (IS_ERR(name)) return PTR_ERR(name); |
79f6530cb audit: fix mq_ope... |
839 |
audit_inode_parent_hidden(name, mnt->mnt_root); |
312b90fbe mqueue: lift mnt_... |
840 841 842 |
err = mnt_want_write(mnt); if (err) goto out_name; |
5955102c9 wrappers for ->i_... |
843 |
inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
91a27b2a7 vfs: define struc... |
844 845 |
dentry = lookup_one_len(name->name, mnt->mnt_root, strlen(name->name)); |
1da177e4c Linux-2.6.12-rc2 |
846 847 848 849 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_unlock; } |
75c3cfa85 VFS: assorted wei... |
850 |
inode = d_inode(dentry); |
312b90fbe mqueue: lift mnt_... |
851 852 853 |
if (!inode) { err = -ENOENT; } else { |
7de9c6ee3 new helper: ihold() |
854 |
ihold(inode); |
75c3cfa85 VFS: assorted wei... |
855 |
err = vfs_unlink(d_inode(dentry->d_parent), dentry, NULL); |
312b90fbe mqueue: lift mnt_... |
856 |
} |
1da177e4c Linux-2.6.12-rc2 |
857 858 859 |
dput(dentry); out_unlock: |
5955102c9 wrappers for ->i_... |
860 |
inode_unlock(d_inode(mnt->mnt_root)); |
1da177e4c Linux-2.6.12-rc2 |
861 862 |
if (inode) iput(inode); |
312b90fbe mqueue: lift mnt_... |
863 864 865 |
mnt_drop_write(mnt); out_name: putname(name); |
1da177e4c Linux-2.6.12-rc2 |
866 867 868 869 870 871 872 873 874 875 |
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... |
876 877 878 879 880 881 882 883 884 |
* 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 |
885 886 887 888 889 890 891 |
* * 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... |
892 893 |
static inline void pipelined_send(struct wake_q_head *wake_q, struct mqueue_inode_info *info, |
1da177e4c Linux-2.6.12-rc2 |
894 895 896 897 898 |
struct msg_msg *message, struct ext_wait_queue *receiver) { receiver->msg = message; list_del(&receiver->list); |
fa6004ad4 ipc/mqueue: Imple... |
899 900 901 902 903 904 905 906 907 |
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 |
908 909 910 911 912 |
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... |
913 914 |
static inline void pipelined_receive(struct wake_q_head *wake_q, struct mqueue_inode_info *info) |
1da177e4c Linux-2.6.12-rc2 |
915 916 917 918 919 920 921 922 |
{ 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... |
923 924 |
if (msg_insert(sender->msg, info)) return; |
fa6004ad4 ipc/mqueue: Imple... |
925 |
|
1da177e4c Linux-2.6.12-rc2 |
926 |
list_del(&sender->list); |
fa6004ad4 ipc/mqueue: Imple... |
927 |
wake_q_add(wake_q, sender->task); |
1da177e4c Linux-2.6.12-rc2 |
928 929 |
sender->state = STATE_READY; } |
0d0606060 mqueue: move comp... |
930 931 |
static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr, size_t msg_len, unsigned int msg_prio, |
b90477263 ipc: mqueue: Repl... |
932 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
933 |
{ |
2903ff019 switch simple cas... |
934 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
935 936 937 938 939 |
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... |
940 |
ktime_t expires, *timeout = NULL; |
ce2d52cc1 ipc/mqueue: add r... |
941 |
struct posix_msg_tree_node *new_leaf = NULL; |
2903ff019 switch simple cas... |
942 |
int ret = 0; |
194a6b5b9 sched/wake_q: Ren... |
943 |
DEFINE_WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
944 945 946 |
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) return -EINVAL; |
0d0606060 mqueue: move comp... |
947 |
if (ts) { |
b90477263 ipc: mqueue: Repl... |
948 |
expires = timespec64_to_ktime(*ts); |
0d0606060 mqueue: move comp... |
949 950 951 952 |
timeout = &expires; } audit_mq_sendrecv(mqdes, msg_len, msg_prio, ts); |
1da177e4c Linux-2.6.12-rc2 |
953 |
|
2903ff019 switch simple cas... |
954 955 |
f = fdget(mqdes); if (unlikely(!f.file)) { |
8d8ffefaa mqueue: only set ... |
956 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
957 |
goto out; |
8d8ffefaa mqueue: only set ... |
958 |
} |
1da177e4c Linux-2.6.12-rc2 |
959 |
|
496ad9aa8 new helper: file_... |
960 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
961 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
962 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
963 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
964 |
} |
1da177e4c Linux-2.6.12-rc2 |
965 |
info = MQUEUE_I(inode); |
9f45f5bf3 new helper: audit... |
966 |
audit_file(f.file); |
1da177e4c Linux-2.6.12-rc2 |
967 |
|
2903ff019 switch simple cas... |
968 |
if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
8d8ffefaa mqueue: only set ... |
969 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
970 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
971 |
} |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 |
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... |
987 988 989 990 991 992 993 |
/* * 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 |
994 |
spin_lock(&info->lock); |
ce2d52cc1 ipc/mqueue: add r... |
995 996 |
if (!info->node_cache && new_leaf) { /* Save our speculative allocation into the cache */ |
ce2d52cc1 ipc/mqueue: add r... |
997 998 |
INIT_LIST_HEAD(&new_leaf->msg_list); info->node_cache = new_leaf; |
ce2d52cc1 ipc/mqueue: add r... |
999 1000 1001 1002 |
new_leaf = NULL; } else { kfree(new_leaf); } |
1da177e4c Linux-2.6.12-rc2 |
1003 |
if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
2903ff019 switch simple cas... |
1004 |
if (f.file->f_flags & O_NONBLOCK) { |
1da177e4c Linux-2.6.12-rc2 |
1005 |
ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 1008 1009 1010 |
} 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... |
1011 1012 1013 1014 1015 |
/* * wq_sleep must be called with info->lock held, and * returns with the lock released */ goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
1016 |
} |
1da177e4c Linux-2.6.12-rc2 |
1017 1018 1019 |
} else { receiver = wq_get_first_waiter(info, RECV); if (receiver) { |
fa6004ad4 ipc/mqueue: Imple... |
1020 |
pipelined_send(&wake_q, info, msg_ptr, receiver); |
1da177e4c Linux-2.6.12-rc2 |
1021 1022 |
} else { /* adds message to the queue */ |
ce2d52cc1 ipc/mqueue: add r... |
1023 1024 1025 |
ret = msg_insert(msg_ptr, info); if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 1028 |
__do_notify(info); } inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
1029 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1030 |
} |
ce2d52cc1 ipc/mqueue: add r... |
1031 1032 |
out_unlock: spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1033 |
wake_up_q(&wake_q); |
ce2d52cc1 ipc/mqueue: add r... |
1034 1035 1036 |
out_free: if (ret) free_msg(msg_ptr); |
1da177e4c Linux-2.6.12-rc2 |
1037 |
out_fput: |
2903ff019 switch simple cas... |
1038 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 1041 |
out: return ret; } |
0d0606060 mqueue: move comp... |
1042 1043 |
static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr, size_t msg_len, unsigned int __user *u_msg_prio, |
b90477263 ipc: mqueue: Repl... |
1044 |
struct timespec64 *ts) |
1da177e4c Linux-2.6.12-rc2 |
1045 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
ssize_t ret; struct msg_msg *msg_ptr; |
2903ff019 switch simple cas... |
1048 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 1051 |
struct inode *inode; struct mqueue_inode_info *info; struct ext_wait_queue wait; |
9ca7d8e68 mqueue: Convert m... |
1052 |
ktime_t expires, *timeout = NULL; |
ce2d52cc1 ipc/mqueue: add r... |
1053 |
struct posix_msg_tree_node *new_leaf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1054 |
|
0d0606060 mqueue: move comp... |
1055 |
if (ts) { |
b90477263 ipc: mqueue: Repl... |
1056 |
expires = timespec64_to_ktime(*ts); |
9ca7d8e68 mqueue: Convert m... |
1057 |
timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
1058 |
} |
20ca73bc7 [PATCH] Audit of ... |
1059 |
|
0d0606060 mqueue: move comp... |
1060 |
audit_mq_sendrecv(mqdes, msg_len, 0, ts); |
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 { |
194a6b5b9 sched/wake_q: Ren... |
1113 |
DEFINE_WAKE_Q(wake_q); |
fa6004ad4 ipc/mqueue: Imple... |
1114 |
|
1da177e4c Linux-2.6.12-rc2 |
1115 1116 1117 |
msg_ptr = msg_get(info); inode->i_atime = inode->i_mtime = inode->i_ctime = |
078cd8279 fs: Replace CURRE... |
1118 |
current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 |
/* There is now free space in queue. */ |
fa6004ad4 ipc/mqueue: Imple... |
1121 |
pipelined_receive(&wake_q, info); |
1da177e4c Linux-2.6.12-rc2 |
1122 |
spin_unlock(&info->lock); |
fa6004ad4 ipc/mqueue: Imple... |
1123 |
wake_up_q(&wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 |
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... |
1136 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 1139 |
out: return ret; } |
0d0606060 mqueue: move comp... |
1140 1141 1142 1143 |
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) { |
b90477263 ipc: mqueue: Repl... |
1144 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 |
if (u_abs_timeout) { int res = prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); } SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, size_t, msg_len, unsigned int __user *, u_msg_prio, const struct timespec __user *, u_abs_timeout) { |
b90477263 ipc: mqueue: Repl... |
1158 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1159 1160 1161 1162 1163 1164 1165 1166 |
if (u_abs_timeout) { int res = prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } |
1da177e4c Linux-2.6.12-rc2 |
1167 1168 1169 1170 1171 |
/* * Notes: the case when user wants us to deregister (with NULL as pointer) * and he isn't currently owner of notification, will be silently discarded. * It isn't explicitly defined in the POSIX. */ |
0d0606060 mqueue: move comp... |
1172 |
static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
1da177e4c Linux-2.6.12-rc2 |
1173 |
{ |
2903ff019 switch simple cas... |
1174 1175 |
int ret; struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 |
struct sock *sock; struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
1178 1179 |
struct mqueue_inode_info *info; struct sk_buff *nc; |
0d0606060 mqueue: move comp... |
1180 |
audit_mq_notify(mqdes, notification); |
1da177e4c Linux-2.6.12-rc2 |
1181 |
|
20114f71b sanitize audit_mq... |
1182 1183 |
nc = NULL; sock = NULL; |
0d0606060 mqueue: move comp... |
1184 1185 1186 1187 |
if (notification != NULL) { if (unlikely(notification->sigev_notify != SIGEV_NONE && notification->sigev_notify != SIGEV_SIGNAL && notification->sigev_notify != SIGEV_THREAD)) |
1da177e4c Linux-2.6.12-rc2 |
1188 |
return -EINVAL; |
0d0606060 mqueue: move comp... |
1189 1190 |
if (notification->sigev_notify == SIGEV_SIGNAL && !valid_signal(notification->sigev_signo)) { |
1da177e4c Linux-2.6.12-rc2 |
1191 1192 |
return -EINVAL; } |
0d0606060 mqueue: move comp... |
1193 |
if (notification->sigev_notify == SIGEV_THREAD) { |
c3d8d1e30 [NETLINK]: Fix un... |
1194 |
long timeo; |
1da177e4c Linux-2.6.12-rc2 |
1195 1196 |
/* create the notify skb */ nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
8d8ffefaa mqueue: only set ... |
1197 1198 |
if (!nc) { ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1199 |
goto out; |
8d8ffefaa mqueue: only set ... |
1200 |
} |
1da177e4c Linux-2.6.12-rc2 |
1201 |
if (copy_from_user(nc->data, |
0d0606060 mqueue: move comp... |
1202 |
notification->sigev_value.sival_ptr, |
1da177e4c Linux-2.6.12-rc2 |
1203 |
NOTIFY_COOKIE_LEN)) { |
8d8ffefaa mqueue: only set ... |
1204 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1205 1206 1207 1208 1209 1210 1211 |
goto out; } /* TODO: add a header? */ skb_put(nc, NOTIFY_COOKIE_LEN); /* and attach it to the socket */ retry: |
0d0606060 mqueue: move comp... |
1212 |
f = fdget(notification->sigev_signo); |
2903ff019 switch simple cas... |
1213 |
if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1214 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1215 |
goto out; |
8d8ffefaa mqueue: only set ... |
1216 |
} |
2903ff019 switch simple cas... |
1217 1218 |
sock = netlink_getsockbyfilp(f.file); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1219 1220 1221 1222 1223 |
if (IS_ERR(sock)) { ret = PTR_ERR(sock); sock = NULL; goto out; } |
c3d8d1e30 [NETLINK]: Fix un... |
1224 |
timeo = MAX_SCHEDULE_TIMEOUT; |
9457afee8 netlink: Remove n... |
1225 |
ret = netlink_attachskb(sock, nc, &timeo, NULL); |
f991af3da mqueue: fix a use... |
1226 1227 |
if (ret == 1) { sock = NULL; |
8d8ffefaa mqueue: only set ... |
1228 |
goto retry; |
f991af3da mqueue: fix a use... |
1229 |
} |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 1234 1235 1236 |
if (ret) { sock = NULL; nc = NULL; goto out; } } } |
2903ff019 switch simple cas... |
1237 1238 |
f = fdget(mqdes); if (!f.file) { |
8d8ffefaa mqueue: only set ... |
1239 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1240 |
goto out; |
8d8ffefaa mqueue: only set ... |
1241 |
} |
1da177e4c Linux-2.6.12-rc2 |
1242 |
|
496ad9aa8 new helper: file_... |
1243 |
inode = file_inode(f.file); |
2903ff019 switch simple cas... |
1244 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
8d8ffefaa mqueue: only set ... |
1245 |
ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1246 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1247 |
} |
1da177e4c Linux-2.6.12-rc2 |
1248 1249 1250 1251 |
info = MQUEUE_I(inode); ret = 0; spin_lock(&info->lock); |
0d0606060 mqueue: move comp... |
1252 |
if (notification == NULL) { |
a03fcb730 [PATCH] update mq... |
1253 |
if (info->notify_owner == task_tgid(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1254 |
remove_notification(info); |
078cd8279 fs: Replace CURRE... |
1255 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1256 |
} |
a03fcb730 [PATCH] update mq... |
1257 |
} else if (info->notify_owner != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1258 1259 |
ret = -EBUSY; } else { |
0d0606060 mqueue: move comp... |
1260 |
switch (notification->sigev_notify) { |
1da177e4c Linux-2.6.12-rc2 |
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 |
case SIGEV_NONE: info->notify.sigev_notify = SIGEV_NONE; break; case SIGEV_THREAD: info->notify_sock = sock; info->notify_cookie = nc; sock = NULL; nc = NULL; info->notify.sigev_notify = SIGEV_THREAD; break; case SIGEV_SIGNAL: |
0d0606060 mqueue: move comp... |
1272 1273 |
info->notify.sigev_signo = notification->sigev_signo; info->notify.sigev_value = notification->sigev_value; |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 |
info->notify.sigev_notify = SIGEV_SIGNAL; break; } |
a03fcb730 [PATCH] update mq... |
1277 1278 |
info->notify_owner = get_pid(task_tgid(current)); |
6f9ac6d93 mqueue: Explicitl... |
1279 |
info->notify_user_ns = get_user_ns(current_user_ns()); |
078cd8279 fs: Replace CURRE... |
1280 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1281 1282 1283 |
} spin_unlock(&info->lock); out_fput: |
2903ff019 switch simple cas... |
1284 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
1285 |
out: |
3ab08fe20 ipc: remove brace... |
1286 |
if (sock) |
1da177e4c Linux-2.6.12-rc2 |
1287 |
netlink_detachskb(sock, nc); |
3ab08fe20 ipc: remove brace... |
1288 |
else if (nc) |
1da177e4c Linux-2.6.12-rc2 |
1289 |
dev_kfree_skb(nc); |
3ab08fe20 ipc: remove brace... |
1290 |
|
1da177e4c Linux-2.6.12-rc2 |
1291 1292 |
return ret; } |
0d0606060 mqueue: move comp... |
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 |
SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification) { struct sigevent n, *p = NULL; if (u_notification) { if (copy_from_user(&n, u_notification, sizeof(struct sigevent))) return -EFAULT; p = &n; } return do_mq_notify(mqdes, p); } static int do_mq_getsetattr(int mqdes, struct mq_attr *new, struct mq_attr *old) |
1da177e4c Linux-2.6.12-rc2 |
1306 |
{ |
2903ff019 switch simple cas... |
1307 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
1308 1309 |
struct inode *inode; struct mqueue_inode_info *info; |
0d0606060 mqueue: move comp... |
1310 1311 |
if (new && (new->mq_flags & (~O_NONBLOCK))) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1312 |
|
2903ff019 switch simple cas... |
1313 |
f = fdget(mqdes); |
0d0606060 mqueue: move comp... |
1314 1315 |
if (!f.file) return -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1316 |
|
2903ff019 switch simple cas... |
1317 |
if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
0d0606060 mqueue: move comp... |
1318 1319 |
fdput(f); return -EBADF; |
8d8ffefaa mqueue: only set ... |
1320 |
} |
0d0606060 mqueue: move comp... |
1321 1322 |
inode = file_inode(f.file); |
1da177e4c Linux-2.6.12-rc2 |
1323 1324 1325 |
info = MQUEUE_I(inode); spin_lock(&info->lock); |
0d0606060 mqueue: move comp... |
1326 1327 1328 1329 1330 1331 |
if (old) { *old = info->attr; old->mq_flags = f.file->f_flags & O_NONBLOCK; } if (new) { audit_mq_getsetattr(mqdes, new); |
2903ff019 switch simple cas... |
1332 |
spin_lock(&f.file->f_lock); |
0d0606060 mqueue: move comp... |
1333 |
if (new->mq_flags & O_NONBLOCK) |
2903ff019 switch simple cas... |
1334 |
f.file->f_flags |= O_NONBLOCK; |
1da177e4c Linux-2.6.12-rc2 |
1335 |
else |
2903ff019 switch simple cas... |
1336 1337 |
f.file->f_flags &= ~O_NONBLOCK; spin_unlock(&f.file->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1338 |
|
078cd8279 fs: Replace CURRE... |
1339 |
inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1340 1341 1342 |
} spin_unlock(&info->lock); |
0d0606060 mqueue: move comp... |
1343 1344 1345 |
fdput(f); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1346 |
|
0d0606060 mqueue: move comp... |
1347 1348 1349 1350 1351 1352 1353 |
SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct mq_attr __user *, u_mqstat, struct mq_attr __user *, u_omqstat) { int ret; struct mq_attr mqstat, omqstat; struct mq_attr *new = NULL, *old = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1354 |
|
0d0606060 mqueue: move comp... |
1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 |
if (u_mqstat) { new = &mqstat; if (copy_from_user(new, u_mqstat, sizeof(struct mq_attr))) return -EFAULT; } if (u_omqstat) old = &omqstat; ret = do_mq_getsetattr(mqdes, new, old); if (ret || !old) return ret; if (copy_to_user(u_omqstat, old, sizeof(struct mq_attr))) return -EFAULT; return 0; } #ifdef CONFIG_COMPAT struct compat_mq_attr { compat_long_t mq_flags; /* message queue flags */ compat_long_t mq_maxmsg; /* maximum number of messages */ compat_long_t mq_msgsize; /* maximum message size */ compat_long_t mq_curmsgs; /* number of messages currently queued */ compat_long_t __reserved[4]; /* ignored for input, zeroed for output */ }; static inline int get_compat_mq_attr(struct mq_attr *attr, const struct compat_mq_attr __user *uattr) { struct compat_mq_attr v; if (copy_from_user(&v, uattr, sizeof(*uattr))) return -EFAULT; memset(attr, 0, sizeof(*attr)); attr->mq_flags = v.mq_flags; attr->mq_maxmsg = v.mq_maxmsg; attr->mq_msgsize = v.mq_msgsize; attr->mq_curmsgs = v.mq_curmsgs; return 0; } static inline int put_compat_mq_attr(const struct mq_attr *attr, struct compat_mq_attr __user *uattr) { struct compat_mq_attr v; memset(&v, 0, sizeof(v)); v.mq_flags = attr->mq_flags; v.mq_maxmsg = attr->mq_maxmsg; v.mq_msgsize = attr->mq_msgsize; v.mq_curmsgs = attr->mq_curmsgs; if (copy_to_user(uattr, &v, sizeof(*uattr))) return -EFAULT; return 0; } COMPAT_SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, compat_mode_t, mode, struct compat_mq_attr __user *, u_attr) { struct mq_attr attr, *p = NULL; if (u_attr && oflag & O_CREAT) { p = &attr; if (get_compat_mq_attr(&attr, u_attr)) return -EFAULT; } return do_mq_open(u_name, oflag, mode, p); } static int compat_prepare_timeout(const struct compat_timespec __user *p, |
b90477263 ipc: mqueue: Repl... |
1427 |
struct timespec64 *ts) |
0d0606060 mqueue: move comp... |
1428 |
{ |
b90477263 ipc: mqueue: Repl... |
1429 |
if (compat_get_timespec64(ts, p)) |
0d0606060 mqueue: move comp... |
1430 |
return -EFAULT; |
b90477263 ipc: mqueue: Repl... |
1431 |
if (!timespec64_valid(ts)) |
0d0606060 mqueue: move comp... |
1432 1433 1434 1435 1436 1437 1438 1439 1440 |
return -EINVAL; return 0; } COMPAT_SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int, msg_prio, const struct compat_timespec __user *, u_abs_timeout) { |
b90477263 ipc: mqueue: Repl... |
1441 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 |
if (u_abs_timeout) { int res = compat_prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); } COMPAT_SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int __user *, u_msg_prio, const struct compat_timespec __user *, u_abs_timeout) { |
b90477263 ipc: mqueue: Repl... |
1456 |
struct timespec64 ts, *p = NULL; |
0d0606060 mqueue: move comp... |
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 |
if (u_abs_timeout) { int res = compat_prepare_timeout(u_abs_timeout, &ts); if (res) return res; p = &ts; } return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct compat_sigevent __user *, u_notification) { struct sigevent n, *p = NULL; if (u_notification) { if (get_compat_sigevent(&n, u_notification)) return -EFAULT; if (n.sigev_notify == SIGEV_THREAD) n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); p = &n; } return do_mq_notify(mqdes, p); } COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct compat_mq_attr __user *, u_mqstat, struct compat_mq_attr __user *, u_omqstat) { int ret; struct mq_attr mqstat, omqstat; struct mq_attr *new = NULL, *old = NULL; if (u_mqstat) { new = &mqstat; if (get_compat_mq_attr(new, u_mqstat)) return -EFAULT; } if (u_omqstat) old = &omqstat; ret = do_mq_getsetattr(mqdes, new, old); if (ret || !old) return ret; if (put_compat_mq_attr(old, u_omqstat)) return -EFAULT; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1503 |
} |
0d0606060 mqueue: move comp... |
1504 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1505 |
|
92e1d5be9 [PATCH] mark stru... |
1506 |
static const struct inode_operations mqueue_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1507 1508 1509 1510 |
.lookup = simple_lookup, .create = mqueue_create, .unlink = mqueue_unlink, }; |
9a32144e9 [PATCH] mark stru... |
1511 |
static const struct file_operations mqueue_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1512 1513 1514 |
.flush = mqueue_flush_file, .poll = mqueue_poll_file, .read = mqueue_read_file, |
6038f373a llseek: automatic... |
1515 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1516 |
}; |
b87221de6 const: mark remai... |
1517 |
static const struct super_operations mqueue_super_ops = { |
1da177e4c Linux-2.6.12-rc2 |
1518 1519 |
.alloc_inode = mqueue_alloc_inode, .destroy_inode = mqueue_destroy_inode, |
6d8af64c1 switch mqueue to ... |
1520 |
.evict_inode = mqueue_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
1521 |
.statfs = simple_statfs, |
1da177e4c Linux-2.6.12-rc2 |
1522 1523 1524 1525 |
}; static struct file_system_type mqueue_fs_type = { .name = "mqueue", |
ceefda693 switch get_sb_ns(... |
1526 |
.mount = mqueue_mount, |
1da177e4c Linux-2.6.12-rc2 |
1527 |
.kill_sb = kill_litter_super, |
bc1b69ed2 userns: Allow the... |
1528 |
.fs_flags = FS_USERNS_MOUNT, |
1da177e4c Linux-2.6.12-rc2 |
1529 |
}; |
7eafd7c74 namespaces: ipc n... |
1530 1531 1532 1533 1534 1535 |
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 ... |
1536 1537 |
ns->mq_msg_default = DFLT_MSG; ns->mq_msgsize_default = DFLT_MSGSIZE; |
7eafd7c74 namespaces: ipc n... |
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 |
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 ... |
1555 |
kern_unmount(ns->mq_mnt); |
7eafd7c74 namespaces: ipc n... |
1556 |
} |
1da177e4c Linux-2.6.12-rc2 |
1557 1558 1559 1560 1561 1562 |
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... |
1563 |
SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 |
if (mqueue_inode_cachep == NULL) return -ENOMEM; |
2329e392a mqueue: fix typo ... |
1566 |
/* ignore failures - they are not fatal */ |
bdc8e5f85 namespaces: mqueu... |
1567 |
mq_sysctl_table = mq_register_sysctl_table(); |
1da177e4c Linux-2.6.12-rc2 |
1568 1569 1570 1571 |
error = register_filesystem(&mqueue_fs_type); if (error) goto out_sysctl; |
7eafd7c74 namespaces: ipc n... |
1572 |
spin_lock_init(&mq_lock); |
6f686574c ... and the same ... |
1573 1574 |
error = mq_init_ns(&init_ipc_ns); if (error) |
1da177e4c Linux-2.6.12-rc2 |
1575 |
goto out_filesystem; |
1da177e4c Linux-2.6.12-rc2 |
1576 |
|
1da177e4c Linux-2.6.12-rc2 |
1577 1578 1579 1580 1581 1582 1583 |
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... |
1584 |
kmem_cache_destroy(mqueue_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
1585 1586 |
return error; } |
6d08a2567 ipc: use device_i... |
1587 |
device_initcall(init_mqueue_fs); |