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ipc/mqueue.c
30.4 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: * Manfred Spraul (manfred@colorfullife.com) * |
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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> #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/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 #define STATE_PENDING 1 #define STATE_READY 2 |
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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; struct msg_msg **messages; struct mq_attr attr; struct sigevent notify; |
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struct pid* notify_owner; |
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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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static struct ctl_table_header * mq_sysctl_table; 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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static struct inode *mqueue_get_inode(struct super_block *sb, struct ipc_namespace *ipc_ns, int mode, struct mq_attr *attr) |
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{ |
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struct user_struct *u = current_user(); |
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struct inode *inode; |
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int ret = -ENOMEM; |
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inode = new_inode(sb); |
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if (!inode) goto err; inode->i_ino = get_next_ino(); inode->i_mode = mode; inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME; if (S_ISREG(mode)) { struct mqueue_inode_info *info; struct task_struct *p = current; unsigned long mq_bytes, mq_msg_tblsz; 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; info->qsize = 0; info->user = NULL; /* set when all is ok */ memset(&info->attr, 0, sizeof(info->attr)); info->attr.mq_maxmsg = ipc_ns->mq_msg_max; info->attr.mq_msgsize = ipc_ns->mq_msgsize_max; if (attr) { info->attr.mq_maxmsg = attr->mq_maxmsg; info->attr.mq_msgsize = attr->mq_msgsize; } mq_msg_tblsz = info->attr.mq_maxmsg * sizeof(struct msg_msg *); info->messages = kmalloc(mq_msg_tblsz, GFP_KERNEL); if (!info->messages) goto out_inode; mq_bytes = (mq_msg_tblsz + (info->attr.mq_maxmsg * info->attr.mq_msgsize)); |
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spin_lock(&mq_lock); if (u->mq_bytes + mq_bytes < u->mq_bytes || u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) { spin_unlock(&mq_lock); /* mqueue_evict_inode() releases info->messages */ |
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ret = -EMFILE; |
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goto out_inode; |
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} |
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u->mq_bytes += mq_bytes; spin_unlock(&mq_lock); /* all is ok */ info->user = get_uid(u); } else if (S_ISDIR(mode)) { inc_nlink(inode); /* Some things misbehave if size == 0 on a directory */ inode->i_size = 2 * DIRENT_SIZE; inode->i_op = &mqueue_dir_inode_operations; inode->i_fop = &simple_dir_operations; |
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} |
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|
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return inode; out_inode: |
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iput(inode); |
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err: |
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return ERR_PTR(ret); |
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} static int mqueue_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; |
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struct ipc_namespace *ns = data; |
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int error; |
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sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = MQUEUE_MAGIC; sb->s_op = &mqueue_super_ops; |
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inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); |
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if (IS_ERR(inode)) { error = PTR_ERR(inode); |
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goto out; } |
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sb->s_root = d_alloc_root(inode); if (!sb->s_root) { iput(inode); |
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error = -ENOMEM; |
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goto out; |
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} |
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error = 0; |
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|
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out: return error; |
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} |
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static struct dentry *mqueue_mount(struct file_system_type *fs_type, |
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int flags, const char *dev_name, |
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void *data) |
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{ |
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if (!(flags & MS_KERNMOUNT)) data = current->nsproxy->ipc_ns; |
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return mount_ns(fs_type, flags, data, mqueue_fill_super); |
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} |
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static void init_once(void *foo) |
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{ struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo; |
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inode_init_once(&p->vfs_inode); |
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} static struct inode *mqueue_alloc_inode(struct super_block *sb) { struct mqueue_inode_info *ei; |
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ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL); |
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if (!ei) return NULL; return &ei->vfs_inode; } |
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static void mqueue_i_callback(struct rcu_head *head) |
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{ |
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struct inode *inode = container_of(head, struct inode, i_rcu); INIT_LIST_HEAD(&inode->i_dentry); |
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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; unsigned long mq_bytes; int i; |
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struct ipc_namespace *ipc_ns; |
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|
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end_writeback(inode); if (S_ISDIR(inode->i_mode)) |
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return; |
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ipc_ns = get_ns_from_inode(inode); |
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info = MQUEUE_I(inode); spin_lock(&info->lock); for (i = 0; i < info->attr.mq_curmsgs; i++) free_msg(info->messages[i]); kfree(info->messages); spin_unlock(&info->lock); |
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/* Total amount of bytes accounted for the mqueue */ mq_bytes = info->attr.mq_maxmsg * (sizeof(struct msg_msg *) + 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, int mode, struct nameidata *nd) { struct inode *inode; struct mq_attr *attr = dentry->d_fsdata; int error; |
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struct ipc_namespace *ipc_ns; |
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spin_lock(&mq_lock); |
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ipc_ns = __get_ns_from_inode(dir); if (!ipc_ns) { error = -EACCES; goto out_unlock; } |
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if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max && !capable(CAP_SYS_RESOURCE)) { |
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error = -ENOSPC; |
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goto out_unlock; |
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} |
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ipc_ns->mq_queues_count++; |
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spin_unlock(&mq_lock); |
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inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
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if (IS_ERR(inode)) { error = PTR_ERR(inode); |
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spin_lock(&mq_lock); |
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ipc_ns->mq_queues_count--; goto out_unlock; |
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} |
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put_ipc_ns(ipc_ns); |
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dir->i_size += DIRENT_SIZE; dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; d_instantiate(dentry, inode); dget(dentry); return 0; |
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out_unlock: |
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spin_unlock(&mq_lock); |
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if (ipc_ns) put_ipc_ns(ipc_ns); |
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return error; } static int mqueue_unlink(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; dir->i_size -= DIRENT_SIZE; |
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drop_nlink(inode); |
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dput(dentry); return 0; } /* * 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, |
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size_t count, loff_t *off) |
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{ |
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struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode); |
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char buffer[FILENT_SIZE]; |
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ssize_t ret; |
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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, |
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pid_vnr(info->notify_owner)); |
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spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; |
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ret = simple_read_from_buffer(u_data, count, off, buffer, strlen(buffer)); if (ret <= 0) return ret; |
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filp->f_path.dentry->d_inode->i_atime = filp->f_path.dentry->d_inode->i_ctime = CURRENT_TIME; |
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return ret; |
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} |
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static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
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{ |
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struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode); |
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spin_lock(&info->lock); |
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if (task_tgid(current) == info->notify_owner) |
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remove_notification(info); spin_unlock(&info->lock); return 0; } static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) { |
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struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode); |
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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, |
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ktime_t *timeout, struct ext_wait_queue *ewp) |
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{ int retval; signed long time; wq_add(info, sr, ewp); for (;;) { set_current_state(TASK_INTERRUPTIBLE); spin_unlock(&info->lock); |
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time = schedule_hrtimeout_range_clock(timeout, 0, HRTIMER_MODE_ABS, CLOCK_REALTIME); |
1da177e4c Linux-2.6.12-rc2 |
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 |
while (ewp->state == STATE_PENDING) cpu_relax(); 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); } /* Auxiliary functions to manipulate messages' list */ static void msg_insert(struct msg_msg *ptr, struct mqueue_inode_info *info) { int k; k = info->attr.mq_curmsgs - 1; while (k >= 0 && info->messages[k]->m_type >= ptr->m_type) { info->messages[k + 1] = info->messages[k]; k--; } info->attr.mq_curmsgs++; info->qsize += ptr->m_ts; info->messages[k + 1] = ptr; } static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) { info->qsize -= info->messages[--info->attr.mq_curmsgs]->m_ts; return info->messages[info->attr.mq_curmsgs]; } static inline void set_cookie(struct sk_buff *skb, char code) { ((char*)skb->data)[NOTIFY_COOKIE_LEN-1] = code; } /* * 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; |
a6684999f mqueue: fix si_pi... |
528 529 |
sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); |
414c0708d CRED: Wrap task c... |
530 |
sig_i.si_uid = current_uid(); |
1da177e4c Linux-2.6.12-rc2 |
531 |
|
a03fcb730 [PATCH] update mq... |
532 533 |
kill_pid_info(info->notify.sigev_signo, &sig_i, info->notify_owner); |
1da177e4c Linux-2.6.12-rc2 |
534 535 536 |
break; case SIGEV_THREAD: set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
7ee015e0f [NET]: cleanup 3r... |
537 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 |
break; } /* after notification unregisters process */ |
a03fcb730 [PATCH] update mq... |
541 542 |
put_pid(info->notify_owner); info->notify_owner = NULL; |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 |
} wake_up(&info->wait_q); } |
9ca7d8e68 mqueue: Convert m... |
546 547 |
static int prepare_timeout(const struct timespec __user *u_abs_timeout, ktime_t *expires, struct timespec *ts) |
1da177e4c Linux-2.6.12-rc2 |
548 |
{ |
9ca7d8e68 mqueue: Convert m... |
549 550 551 552 |
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 |
553 |
|
9ca7d8e68 mqueue: Convert m... |
554 555 |
*expires = timespec_to_ktime(*ts); return 0; |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 559 |
} static void remove_notification(struct mqueue_inode_info *info) { |
a03fcb730 [PATCH] update mq... |
560 |
if (info->notify_owner != NULL && |
1da177e4c Linux-2.6.12-rc2 |
561 562 |
info->notify.sigev_notify == SIGEV_THREAD) { set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
7ee015e0f [NET]: cleanup 3r... |
563 |
netlink_sendskb(info->notify_sock, info->notify_cookie); |
1da177e4c Linux-2.6.12-rc2 |
564 |
} |
a03fcb730 [PATCH] update mq... |
565 566 |
put_pid(info->notify_owner); info->notify_owner = NULL; |
1da177e4c Linux-2.6.12-rc2 |
567 |
} |
614b84cf4 namespaces: mqueu... |
568 |
static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
569 570 571 572 573 574 575 |
{ if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) return 0; if (capable(CAP_SYS_RESOURCE)) { if (attr->mq_maxmsg > HARD_MSGMAX) return 0; } else { |
614b84cf4 namespaces: mqueu... |
576 577 |
if (attr->mq_maxmsg > ipc_ns->mq_msg_max || attr->mq_msgsize > ipc_ns->mq_msgsize_max) |
1da177e4c Linux-2.6.12-rc2 |
578 579 580 581 582 |
return 0; } /* check for overflow */ if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg) return 0; |
8834cf796 mqueue: apply mat... |
583 584 |
if ((unsigned long)(attr->mq_maxmsg * (attr->mq_msgsize + sizeof (struct msg_msg *))) < |
1da177e4c Linux-2.6.12-rc2 |
585 586 587 588 589 590 591 592 |
(unsigned long)(attr->mq_maxmsg * attr->mq_msgsize)) return 0; return 1; } /* * Invoked when creating a new queue via sys_mq_open */ |
614b84cf4 namespaces: mqueu... |
593 594 595 |
static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir, struct dentry *dentry, int oflag, mode_t mode, struct mq_attr *attr) |
1da177e4c Linux-2.6.12-rc2 |
596 |
{ |
745ca2475 CRED: Pass creden... |
597 |
const struct cred *cred = current_cred(); |
4a3fd211c [PATCH] r/o bind ... |
598 |
struct file *result; |
1da177e4c Linux-2.6.12-rc2 |
599 |
int ret; |
564f6993f sanitize audit_mq... |
600 |
if (attr) { |
8d8ffefaa mqueue: only set ... |
601 602 |
if (!mq_attr_ok(ipc_ns, attr)) { ret = -EINVAL; |
7c7dce920 [PATCH] Fix doubl... |
603 |
goto out; |
8d8ffefaa mqueue: only set ... |
604 |
} |
1da177e4c Linux-2.6.12-rc2 |
605 |
/* store for use during create */ |
564f6993f sanitize audit_mq... |
606 |
dentry->d_fsdata = attr; |
1da177e4c Linux-2.6.12-rc2 |
607 |
} |
ce3b0f8d5 New helper - curr... |
608 |
mode &= ~current_umask(); |
614b84cf4 namespaces: mqueu... |
609 |
ret = mnt_want_write(ipc_ns->mq_mnt); |
4a3fd211c [PATCH] r/o bind ... |
610 611 |
if (ret) goto out; |
1da177e4c Linux-2.6.12-rc2 |
612 613 614 |
ret = vfs_create(dir->d_inode, dentry, mode, NULL); dentry->d_fsdata = NULL; if (ret) |
4a3fd211c [PATCH] r/o bind ... |
615 |
goto out_drop_write; |
614b84cf4 namespaces: mqueu... |
616 |
result = dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred); |
4a3fd211c [PATCH] r/o bind ... |
617 618 619 620 |
/* * dentry_open() took a persistent mnt_want_write(), * so we can now drop this one. */ |
614b84cf4 namespaces: mqueu... |
621 |
mnt_drop_write(ipc_ns->mq_mnt); |
4a3fd211c [PATCH] r/o bind ... |
622 623 624 |
return result; out_drop_write: |
614b84cf4 namespaces: mqueu... |
625 |
mnt_drop_write(ipc_ns->mq_mnt); |
7c7dce920 [PATCH] Fix doubl... |
626 627 |
out: dput(dentry); |
614b84cf4 namespaces: mqueu... |
628 |
mntput(ipc_ns->mq_mnt); |
7c7dce920 [PATCH] Fix doubl... |
629 |
return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
630 631 632 |
} /* Opens existing queue */ |
614b84cf4 namespaces: mqueu... |
633 634 |
static struct file *do_open(struct ipc_namespace *ipc_ns, struct dentry *dentry, int oflag) |
1da177e4c Linux-2.6.12-rc2 |
635 |
{ |
04db0dde0 mqueue: simplify ... |
636 |
int ret; |
745ca2475 CRED: Pass creden... |
637 638 639 640 |
const struct cred *cred = current_cred(); static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, MAY_READ | MAY_WRITE }; |
1da177e4c Linux-2.6.12-rc2 |
641 |
|
7c7dce920 [PATCH] Fix doubl... |
642 |
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) { |
04db0dde0 mqueue: simplify ... |
643 644 |
ret = -EINVAL; goto err; |
7c7dce920 [PATCH] Fix doubl... |
645 |
} |
1da177e4c Linux-2.6.12-rc2 |
646 |
|
f419a2e3b [PATCH] kill name... |
647 |
if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) { |
04db0dde0 mqueue: simplify ... |
648 649 |
ret = -EACCES; goto err; |
7c7dce920 [PATCH] Fix doubl... |
650 |
} |
1da177e4c Linux-2.6.12-rc2 |
651 |
|
614b84cf4 namespaces: mqueu... |
652 |
return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred); |
04db0dde0 mqueue: simplify ... |
653 654 655 656 657 |
err: dput(dentry); mntput(ipc_ns->mq_mnt); return ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
658 |
} |
d5460c997 [CVE-2009-0029] S... |
659 660 |
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode, struct mq_attr __user *, u_attr) |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 |
{ struct dentry *dentry; struct file *filp; char *name; |
564f6993f sanitize audit_mq... |
665 |
struct mq_attr attr; |
1da177e4c Linux-2.6.12-rc2 |
666 |
int fd, error; |
7eafd7c74 namespaces: ipc n... |
667 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
668 |
|
564f6993f sanitize audit_mq... |
669 670 671 672 |
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 ... |
673 |
|
1da177e4c Linux-2.6.12-rc2 |
674 675 |
if (IS_ERR(name = getname(u_name))) return PTR_ERR(name); |
269f21344 tiny mq_open opti... |
676 |
fd = get_unused_fd_flags(O_CLOEXEC); |
1da177e4c Linux-2.6.12-rc2 |
677 678 |
if (fd < 0) goto out_putname; |
614b84cf4 namespaces: mqueu... |
679 680 |
mutex_lock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex); dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name)); |
1da177e4c Linux-2.6.12-rc2 |
681 682 |
if (IS_ERR(dentry)) { error = PTR_ERR(dentry); |
4294a8eed mqueue: fix mq_op... |
683 |
goto out_putfd; |
1da177e4c Linux-2.6.12-rc2 |
684 |
} |
614b84cf4 namespaces: mqueu... |
685 |
mntget(ipc_ns->mq_mnt); |
1da177e4c Linux-2.6.12-rc2 |
686 687 688 |
if (oflag & O_CREAT) { if (dentry->d_inode) { /* entry already exists */ |
5a190ae69 [PATCH] pass dent... |
689 |
audit_inode(name, dentry); |
8d8ffefaa mqueue: only set ... |
690 691 |
if (oflag & O_EXCL) { error = -EEXIST; |
7c7dce920 [PATCH] Fix doubl... |
692 |
goto out; |
8d8ffefaa mqueue: only set ... |
693 |
} |
614b84cf4 namespaces: mqueu... |
694 |
filp = do_open(ipc_ns, dentry, oflag); |
1da177e4c Linux-2.6.12-rc2 |
695 |
} else { |
614b84cf4 namespaces: mqueu... |
696 697 |
filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root, dentry, oflag, mode, |
564f6993f sanitize audit_mq... |
698 |
u_attr ? &attr : NULL); |
1da177e4c Linux-2.6.12-rc2 |
699 |
} |
7c7dce920 [PATCH] Fix doubl... |
700 |
} else { |
8d8ffefaa mqueue: only set ... |
701 702 |
if (!dentry->d_inode) { error = -ENOENT; |
7c7dce920 [PATCH] Fix doubl... |
703 |
goto out; |
8d8ffefaa mqueue: only set ... |
704 |
} |
5a190ae69 [PATCH] pass dent... |
705 |
audit_inode(name, dentry); |
614b84cf4 namespaces: mqueu... |
706 |
filp = do_open(ipc_ns, dentry, oflag); |
7c7dce920 [PATCH] Fix doubl... |
707 |
} |
1da177e4c Linux-2.6.12-rc2 |
708 709 710 711 712 |
if (IS_ERR(filp)) { error = PTR_ERR(filp); goto out_putfd; } |
1da177e4c Linux-2.6.12-rc2 |
713 714 |
fd_install(fd, filp); goto out_upsem; |
7c7dce920 [PATCH] Fix doubl... |
715 716 |
out: dput(dentry); |
614b84cf4 namespaces: mqueu... |
717 |
mntput(ipc_ns->mq_mnt); |
7c7dce920 [PATCH] Fix doubl... |
718 |
out_putfd: |
1da177e4c Linux-2.6.12-rc2 |
719 |
put_unused_fd(fd); |
1da177e4c Linux-2.6.12-rc2 |
720 721 |
fd = error; out_upsem: |
614b84cf4 namespaces: mqueu... |
722 |
mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
723 724 725 726 |
out_putname: putname(name); return fd; } |
d5460c997 [CVE-2009-0029] S... |
727 |
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
1da177e4c Linux-2.6.12-rc2 |
728 729 730 731 732 |
{ int err; char *name; struct dentry *dentry; struct inode *inode = NULL; |
7eafd7c74 namespaces: ipc n... |
733 |
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
734 735 736 737 |
name = getname(u_name); if (IS_ERR(name)) return PTR_ERR(name); |
614b84cf4 namespaces: mqueu... |
738 |
mutex_lock_nested(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex, |
7a434814c [PATCH] mqueue: n... |
739 |
I_MUTEX_PARENT); |
614b84cf4 namespaces: mqueu... |
740 |
dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name)); |
1da177e4c Linux-2.6.12-rc2 |
741 742 743 744 745 746 747 748 749 750 751 752 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_unlock; } if (!dentry->d_inode) { err = -ENOENT; goto out_err; } inode = dentry->d_inode; if (inode) |
7de9c6ee3 new helper: ihold() |
753 |
ihold(inode); |
614b84cf4 namespaces: mqueu... |
754 |
err = mnt_want_write(ipc_ns->mq_mnt); |
0622753b8 [PATCH] r/o bind ... |
755 756 |
if (err) goto out_err; |
1da177e4c Linux-2.6.12-rc2 |
757 |
err = vfs_unlink(dentry->d_parent->d_inode, dentry); |
614b84cf4 namespaces: mqueu... |
758 |
mnt_drop_write(ipc_ns->mq_mnt); |
1da177e4c Linux-2.6.12-rc2 |
759 760 761 762 |
out_err: dput(dentry); out_unlock: |
614b84cf4 namespaces: mqueu... |
763 |
mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
putname(name); if (inode) iput(inode); 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 * receiver. * The receiver accepts the message and returns without grabbing the queue * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers * are necessary. The same algorithm is used for sysv semaphores, see |
7b7a317cf [PATCH] mqueue co... |
781 |
* ipc/sem.c for more details. |
1da177e4c Linux-2.6.12-rc2 |
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 |
* * 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). */ static inline void pipelined_send(struct mqueue_inode_info *info, struct msg_msg *message, struct ext_wait_queue *receiver) { receiver->msg = message; list_del(&receiver->list); receiver->state = STATE_PENDING; wake_up_process(receiver->task); |
d59dd4620 [PATCH] use smp_m... |
797 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 |
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). */ static inline void pipelined_receive(struct mqueue_inode_info *info) { struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND); if (!sender) { /* for poll */ wake_up_interruptible(&info->wait_q); return; } msg_insert(sender->msg, info); list_del(&sender->list); sender->state = STATE_PENDING; wake_up_process(sender->task); |
d59dd4620 [PATCH] use smp_m... |
816 |
smp_wmb(); |
1da177e4c Linux-2.6.12-rc2 |
817 818 |
sender->state = STATE_READY; } |
c4ea37c26 [CVE-2009-0029] S... |
819 820 821 |
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 |
822 823 824 825 826 827 828 |
{ struct file *filp; 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... |
829 830 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
1da177e4c Linux-2.6.12-rc2 |
831 |
int ret; |
c32c8af43 sanitize AUDIT_MQ... |
832 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
833 834 835 836 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
837 |
} |
20ca73bc7 [PATCH] Audit of ... |
838 |
|
1da177e4c Linux-2.6.12-rc2 |
839 840 |
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) return -EINVAL; |
9ca7d8e68 mqueue: Convert m... |
841 |
audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
842 |
|
1da177e4c Linux-2.6.12-rc2 |
843 |
filp = fget(mqdes); |
8d8ffefaa mqueue: only set ... |
844 845 |
if (unlikely(!filp)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
846 |
goto out; |
8d8ffefaa mqueue: only set ... |
847 |
} |
1da177e4c Linux-2.6.12-rc2 |
848 |
|
6d63079ad [PATCH] struct pa... |
849 |
inode = filp->f_path.dentry->d_inode; |
8d8ffefaa mqueue: only set ... |
850 851 |
if (unlikely(filp->f_op != &mqueue_file_operations)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
852 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
853 |
} |
1da177e4c Linux-2.6.12-rc2 |
854 |
info = MQUEUE_I(inode); |
5a190ae69 [PATCH] pass dent... |
855 |
audit_inode(NULL, filp->f_path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
856 |
|
8d8ffefaa mqueue: only set ... |
857 858 |
if (unlikely(!(filp->f_mode & FMODE_WRITE))) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
859 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
860 |
} |
1da177e4c Linux-2.6.12-rc2 |
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 |
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; spin_lock(&info->lock); if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { if (filp->f_flags & O_NONBLOCK) { spin_unlock(&info->lock); ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 |
} else { wait.task = current; wait.msg = (void *) msg_ptr; wait.state = STATE_NONE; ret = wq_sleep(info, SEND, timeout, &wait); } if (ret < 0) free_msg(msg_ptr); } else { receiver = wq_get_first_waiter(info, RECV); if (receiver) { pipelined_send(info, msg_ptr, receiver); } else { /* adds message to the queue */ msg_insert(msg_ptr, info); __do_notify(info); } inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; spin_unlock(&info->lock); ret = 0; } out_fput: fput(filp); out: return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
910 911 912 |
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 |
913 |
{ |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 917 918 919 |
ssize_t ret; struct msg_msg *msg_ptr; struct file *filp; struct inode *inode; struct mqueue_inode_info *info; struct ext_wait_queue wait; |
9ca7d8e68 mqueue: Convert m... |
920 921 |
ktime_t expires, *timeout = NULL; struct timespec ts; |
1da177e4c Linux-2.6.12-rc2 |
922 |
|
c32c8af43 sanitize AUDIT_MQ... |
923 |
if (u_abs_timeout) { |
9ca7d8e68 mqueue: Convert m... |
924 925 926 927 |
int res = prepare_timeout(u_abs_timeout, &expires, &ts); if (res) return res; timeout = &expires; |
c32c8af43 sanitize AUDIT_MQ... |
928 |
} |
20ca73bc7 [PATCH] Audit of ... |
929 |
|
9ca7d8e68 mqueue: Convert m... |
930 |
audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL); |
1da177e4c Linux-2.6.12-rc2 |
931 |
|
1da177e4c Linux-2.6.12-rc2 |
932 |
filp = fget(mqdes); |
8d8ffefaa mqueue: only set ... |
933 934 |
if (unlikely(!filp)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
935 |
goto out; |
8d8ffefaa mqueue: only set ... |
936 |
} |
1da177e4c Linux-2.6.12-rc2 |
937 |
|
6d63079ad [PATCH] struct pa... |
938 |
inode = filp->f_path.dentry->d_inode; |
8d8ffefaa mqueue: only set ... |
939 940 |
if (unlikely(filp->f_op != &mqueue_file_operations)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
941 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
942 |
} |
1da177e4c Linux-2.6.12-rc2 |
943 |
info = MQUEUE_I(inode); |
5a190ae69 [PATCH] pass dent... |
944 |
audit_inode(NULL, filp->f_path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
945 |
|
8d8ffefaa mqueue: only set ... |
946 947 |
if (unlikely(!(filp->f_mode & FMODE_READ))) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
948 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
949 |
} |
1da177e4c Linux-2.6.12-rc2 |
950 951 952 953 954 955 956 957 958 959 960 961 |
/* checks if buffer is big enough */ if (unlikely(msg_len < info->attr.mq_msgsize)) { ret = -EMSGSIZE; goto out_fput; } spin_lock(&info->lock); if (info->attr.mq_curmsgs == 0) { if (filp->f_flags & O_NONBLOCK) { spin_unlock(&info->lock); ret = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 |
} else { wait.task = current; wait.state = STATE_NONE; ret = wq_sleep(info, RECV, timeout, &wait); msg_ptr = wait.msg; } } else { msg_ptr = msg_get(info); inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; /* There is now free space in queue. */ pipelined_receive(info); spin_unlock(&info->lock); 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: fput(filp); 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... |
999 1000 |
SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification) |
1da177e4c Linux-2.6.12-rc2 |
1001 1002 1003 1004 1005 1006 1007 1008 |
{ int ret; struct file *filp; struct sock *sock; struct inode *inode; struct sigevent notification; struct mqueue_inode_info *info; struct sk_buff *nc; |
20114f71b sanitize audit_mq... |
1009 |
if (u_notification) { |
1da177e4c Linux-2.6.12-rc2 |
1010 1011 1012 |
if (copy_from_user(¬ification, u_notification, sizeof(struct sigevent))) return -EFAULT; |
20114f71b sanitize audit_mq... |
1013 1014 1015 |
} audit_mq_notify(mqdes, u_notification ? ¬ification : NULL); |
1da177e4c Linux-2.6.12-rc2 |
1016 |
|
20114f71b sanitize audit_mq... |
1017 1018 1019 |
nc = NULL; sock = NULL; if (u_notification != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 1022 1023 1024 |
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... |
1025 |
!valid_signal(notification.sigev_signo)) { |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 1028 |
return -EINVAL; } if (notification.sigev_notify == SIGEV_THREAD) { |
c3d8d1e30 [NETLINK]: Fix un... |
1029 |
long timeo; |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 |
/* create the notify skb */ nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
8d8ffefaa mqueue: only set ... |
1032 1033 |
if (!nc) { ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1034 |
goto out; |
8d8ffefaa mqueue: only set ... |
1035 |
} |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 |
if (copy_from_user(nc->data, notification.sigev_value.sival_ptr, NOTIFY_COOKIE_LEN)) { |
8d8ffefaa mqueue: only set ... |
1039 |
ret = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 1043 1044 1045 1046 1047 |
goto out; } /* TODO: add a header? */ skb_put(nc, NOTIFY_COOKIE_LEN); /* and attach it to the socket */ retry: filp = fget(notification.sigev_signo); |
8d8ffefaa mqueue: only set ... |
1048 1049 |
if (!filp) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1050 |
goto out; |
8d8ffefaa mqueue: only set ... |
1051 |
} |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 1054 1055 1056 1057 1058 |
sock = netlink_getsockbyfilp(filp); fput(filp); if (IS_ERR(sock)) { ret = PTR_ERR(sock); sock = NULL; goto out; } |
c3d8d1e30 [NETLINK]: Fix un... |
1059 |
timeo = MAX_SCHEDULE_TIMEOUT; |
9457afee8 netlink: Remove n... |
1060 |
ret = netlink_attachskb(sock, nc, &timeo, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1061 |
if (ret == 1) |
8d8ffefaa mqueue: only set ... |
1062 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1063 1064 1065 1066 1067 1068 1069 |
if (ret) { sock = NULL; nc = NULL; goto out; } } } |
1da177e4c Linux-2.6.12-rc2 |
1070 |
filp = fget(mqdes); |
8d8ffefaa mqueue: only set ... |
1071 1072 |
if (!filp) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1073 |
goto out; |
8d8ffefaa mqueue: only set ... |
1074 |
} |
1da177e4c Linux-2.6.12-rc2 |
1075 |
|
6d63079ad [PATCH] struct pa... |
1076 |
inode = filp->f_path.dentry->d_inode; |
8d8ffefaa mqueue: only set ... |
1077 1078 |
if (unlikely(filp->f_op != &mqueue_file_operations)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1079 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1080 |
} |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 1084 1085 |
info = MQUEUE_I(inode); ret = 0; spin_lock(&info->lock); if (u_notification == NULL) { |
a03fcb730 [PATCH] update mq... |
1086 |
if (info->notify_owner == task_tgid(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1087 1088 1089 |
remove_notification(info); inode->i_atime = inode->i_ctime = CURRENT_TIME; } |
a03fcb730 [PATCH] update mq... |
1090 |
} else if (info->notify_owner != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 |
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... |
1110 1111 |
info->notify_owner = get_pid(task_tgid(current)); |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 |
inode->i_atime = inode->i_ctime = CURRENT_TIME; } spin_unlock(&info->lock); out_fput: fput(filp); out: if (sock) { netlink_detachskb(sock, nc); } else if (nc) { dev_kfree_skb(nc); } return ret; } |
c4ea37c26 [CVE-2009-0029] S... |
1125 1126 1127 |
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 |
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 |
{ int ret; struct mq_attr mqstat, omqstat; struct file *filp; 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; } |
1da177e4c Linux-2.6.12-rc2 |
1141 |
filp = fget(mqdes); |
8d8ffefaa mqueue: only set ... |
1142 1143 |
if (!filp) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1144 |
goto out; |
8d8ffefaa mqueue: only set ... |
1145 |
} |
1da177e4c Linux-2.6.12-rc2 |
1146 |
|
6d63079ad [PATCH] struct pa... |
1147 |
inode = filp->f_path.dentry->d_inode; |
8d8ffefaa mqueue: only set ... |
1148 1149 |
if (unlikely(filp->f_op != &mqueue_file_operations)) { ret = -EBADF; |
1da177e4c Linux-2.6.12-rc2 |
1150 |
goto out_fput; |
8d8ffefaa mqueue: only set ... |
1151 |
} |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 1154 1155 1156 1157 1158 |
info = MQUEUE_I(inode); spin_lock(&info->lock); omqstat = info->attr; omqstat.mq_flags = filp->f_flags & O_NONBLOCK; if (u_mqstat) { |
7392906ea sanitize audit_mq... |
1159 |
audit_mq_getsetattr(mqdes, &mqstat); |
db1dd4d37 Use f_lock to pro... |
1160 |
spin_lock(&filp->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1161 1162 1163 1164 |
if (mqstat.mq_flags & O_NONBLOCK) filp->f_flags |= O_NONBLOCK; else filp->f_flags &= ~O_NONBLOCK; |
db1dd4d37 Use f_lock to pro... |
1165 |
spin_unlock(&filp->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 |
inode->i_atime = inode->i_ctime = CURRENT_TIME; } spin_unlock(&info->lock); ret = 0; if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat, sizeof(struct mq_attr))) ret = -EFAULT; out_fput: fput(filp); out: return ret; } |
92e1d5be9 [PATCH] mark stru... |
1182 |
static const struct inode_operations mqueue_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1183 1184 1185 1186 |
.lookup = simple_lookup, .create = mqueue_create, .unlink = mqueue_unlink, }; |
9a32144e9 [PATCH] mark stru... |
1187 |
static const struct file_operations mqueue_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
1188 1189 1190 |
.flush = mqueue_flush_file, .poll = mqueue_poll_file, .read = mqueue_read_file, |
6038f373a llseek: automatic... |
1191 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1192 |
}; |
b87221de6 const: mark remai... |
1193 |
static const struct super_operations mqueue_super_ops = { |
1da177e4c Linux-2.6.12-rc2 |
1194 1195 |
.alloc_inode = mqueue_alloc_inode, .destroy_inode = mqueue_destroy_inode, |
6d8af64c1 switch mqueue to ... |
1196 |
.evict_inode = mqueue_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
1197 |
.statfs = simple_statfs, |
1da177e4c Linux-2.6.12-rc2 |
1198 1199 1200 1201 |
}; static struct file_system_type mqueue_fs_type = { .name = "mqueue", |
ceefda693 switch get_sb_ns(... |
1202 |
.mount = mqueue_mount, |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 |
.kill_sb = kill_litter_super, }; |
7eafd7c74 namespaces: ipc n... |
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 |
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; 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 ... |
1228 |
kern_unmount(ns->mq_mnt); |
7eafd7c74 namespaces: ipc n... |
1229 |
} |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 1234 1235 |
static int __init init_mqueue_fs(void) { int error; mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache", sizeof(struct mqueue_inode_info), 0, |
20c2df83d mm: Remove slab d... |
1236 |
SLAB_HWCACHE_ALIGN, init_once); |
1da177e4c Linux-2.6.12-rc2 |
1237 1238 |
if (mqueue_inode_cachep == NULL) return -ENOMEM; |
2329e392a mqueue: fix typo ... |
1239 |
/* ignore failures - they are not fatal */ |
bdc8e5f85 namespaces: mqueu... |
1240 |
mq_sysctl_table = mq_register_sysctl_table(); |
1da177e4c Linux-2.6.12-rc2 |
1241 1242 1243 1244 |
error = register_filesystem(&mqueue_fs_type); if (error) goto out_sysctl; |
7eafd7c74 namespaces: ipc n... |
1245 |
spin_lock_init(&mq_lock); |
6f686574c ... and the same ... |
1246 1247 |
error = mq_init_ns(&init_ipc_ns); if (error) |
1da177e4c Linux-2.6.12-rc2 |
1248 |
goto out_filesystem; |
1da177e4c Linux-2.6.12-rc2 |
1249 |
|
1da177e4c Linux-2.6.12-rc2 |
1250 1251 1252 1253 1254 1255 1256 |
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... |
1257 |
kmem_cache_destroy(mqueue_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
1258 1259 1260 1261 |
return error; } __initcall(init_mqueue_fs); |