Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * POSIX message queues filesystem for Linux. |
| 3 | * |
| 4 | * Copyright (C) 2003,2004 Krzysztof Benedyczak (golbi@mat.uni.torun.pl) |
Michal Wronski | f66e928 | 2006-10-03 23:23:27 +0200 | [diff] [blame] | 5 | * Michal Wronski (michal.wronski@gmail.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * Spinlocks: Mohamed Abbas (abbas.mohamed@intel.com) |
| 8 | * Lockless receive & send, fd based notify: |
| 9 | * Manfred Spraul (manfred@colorfullife.com) |
| 10 | * |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 11 | * Audit: George Wilson (ltcgcw@us.ibm.com) |
| 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * This file is released under the GPL. |
| 14 | */ |
| 15 | |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/init.h> |
| 18 | #include <linux/pagemap.h> |
| 19 | #include <linux/file.h> |
| 20 | #include <linux/mount.h> |
| 21 | #include <linux/namei.h> |
| 22 | #include <linux/sysctl.h> |
| 23 | #include <linux/poll.h> |
| 24 | #include <linux/mqueue.h> |
| 25 | #include <linux/msg.h> |
| 26 | #include <linux/skbuff.h> |
Doug Ledford | 5b5c4d1 | 2012-05-31 16:26:30 -0700 | [diff] [blame] | 27 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netlink.h> |
| 29 | #include <linux/syscalls.h> |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 30 | #include <linux/audit.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 31 | #include <linux/signal.h> |
Ingo Molnar | 5f921ae | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 32 | #include <linux/mutex.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 33 | #include <linux/nsproxy.h> |
| 34 | #include <linux/pid.h> |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 35 | #include <linux/ipc_namespace.h> |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 36 | #include <linux/user_namespace.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Ingo Molnar | 5f921ae | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <net/sock.h> |
| 40 | #include "util.h" |
| 41 | |
| 42 | #define MQUEUE_MAGIC 0x19800202 |
| 43 | #define DIRENT_SIZE 20 |
| 44 | #define FILENT_SIZE 80 |
| 45 | |
| 46 | #define SEND 0 |
| 47 | #define RECV 1 |
| 48 | |
| 49 | #define STATE_NONE 0 |
| 50 | #define STATE_PENDING 1 |
| 51 | #define STATE_READY 2 |
| 52 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 53 | struct posix_msg_tree_node { |
| 54 | struct rb_node rb_node; |
| 55 | struct list_head msg_list; |
| 56 | int priority; |
| 57 | }; |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | struct ext_wait_queue { /* queue of sleeping tasks */ |
| 60 | struct task_struct *task; |
| 61 | struct list_head list; |
| 62 | struct msg_msg *msg; /* ptr of loaded message */ |
| 63 | int state; /* one of STATE_* values */ |
| 64 | }; |
| 65 | |
| 66 | struct mqueue_inode_info { |
| 67 | spinlock_t lock; |
| 68 | struct inode vfs_inode; |
| 69 | wait_queue_head_t wait_q; |
| 70 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 71 | struct rb_root msg_tree; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 72 | struct posix_msg_tree_node *node_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | struct mq_attr attr; |
| 74 | |
| 75 | struct sigevent notify; |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 76 | struct pid* notify_owner; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 77 | struct user_namespace *notify_user_ns; |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 78 | struct user_struct *user; /* user who created, for accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | struct sock *notify_sock; |
| 80 | struct sk_buff *notify_cookie; |
| 81 | |
| 82 | /* for tasks waiting for free space and messages, respectively */ |
| 83 | struct ext_wait_queue e_wait_q[2]; |
| 84 | |
| 85 | unsigned long qsize; /* size of queue in memory (sum of all msgs) */ |
| 86 | }; |
| 87 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 88 | static const struct inode_operations mqueue_dir_inode_operations; |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 89 | static const struct file_operations mqueue_file_operations; |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 90 | static const struct super_operations mqueue_super_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | static void remove_notification(struct mqueue_inode_info *info); |
| 92 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 93 | static struct kmem_cache *mqueue_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | static struct ctl_table_header * mq_sysctl_table; |
| 96 | |
| 97 | static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode) |
| 98 | { |
| 99 | return container_of(inode, struct mqueue_inode_info, vfs_inode); |
| 100 | } |
| 101 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 102 | /* |
| 103 | * This routine should be called with the mq_lock held. |
| 104 | */ |
| 105 | static inline struct ipc_namespace *__get_ns_from_inode(struct inode *inode) |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 106 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 107 | return get_ipc_ns(inode->i_sb->s_fs_info); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 110 | static struct ipc_namespace *get_ns_from_inode(struct inode *inode) |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 111 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 112 | struct ipc_namespace *ns; |
| 113 | |
| 114 | spin_lock(&mq_lock); |
| 115 | ns = __get_ns_from_inode(inode); |
| 116 | spin_unlock(&mq_lock); |
| 117 | return ns; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 118 | } |
| 119 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 120 | /* Auxiliary functions to manipulate messages' list */ |
| 121 | static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info) |
| 122 | { |
| 123 | struct rb_node **p, *parent = NULL; |
| 124 | struct posix_msg_tree_node *leaf; |
| 125 | |
| 126 | p = &info->msg_tree.rb_node; |
| 127 | while (*p) { |
| 128 | parent = *p; |
| 129 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
| 130 | |
| 131 | if (likely(leaf->priority == msg->m_type)) |
| 132 | goto insert_msg; |
| 133 | else if (msg->m_type < leaf->priority) |
| 134 | p = &(*p)->rb_left; |
| 135 | else |
| 136 | p = &(*p)->rb_right; |
| 137 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 138 | if (info->node_cache) { |
| 139 | leaf = info->node_cache; |
| 140 | info->node_cache = NULL; |
| 141 | } else { |
| 142 | leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC); |
| 143 | if (!leaf) |
| 144 | return -ENOMEM; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 145 | INIT_LIST_HEAD(&leaf->msg_list); |
| 146 | info->qsize += sizeof(*leaf); |
| 147 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 148 | leaf->priority = msg->m_type; |
| 149 | rb_link_node(&leaf->rb_node, parent, p); |
| 150 | rb_insert_color(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 151 | insert_msg: |
| 152 | info->attr.mq_curmsgs++; |
| 153 | info->qsize += msg->m_ts; |
| 154 | list_add_tail(&msg->m_list, &leaf->msg_list); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) |
| 159 | { |
| 160 | struct rb_node **p, *parent = NULL; |
| 161 | struct posix_msg_tree_node *leaf; |
| 162 | struct msg_msg *msg; |
| 163 | |
| 164 | try_again: |
| 165 | p = &info->msg_tree.rb_node; |
| 166 | while (*p) { |
| 167 | parent = *p; |
| 168 | /* |
| 169 | * During insert, low priorities go to the left and high to the |
| 170 | * right. On receive, we want the highest priorities first, so |
| 171 | * walk all the way to the right. |
| 172 | */ |
| 173 | p = &(*p)->rb_right; |
| 174 | } |
| 175 | if (!parent) { |
| 176 | if (info->attr.mq_curmsgs) { |
| 177 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 178 | "no tree element, but supposedly messages " |
| 179 | "should exist!\n"); |
| 180 | info->attr.mq_curmsgs = 0; |
| 181 | } |
| 182 | return NULL; |
| 183 | } |
| 184 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 185 | if (unlikely(list_empty(&leaf->msg_list))) { |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 186 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 187 | "empty leaf node but we haven't implemented " |
| 188 | "lazy leaf delete!\n"); |
| 189 | rb_erase(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 190 | if (info->node_cache) { |
| 191 | info->qsize -= sizeof(*leaf); |
| 192 | kfree(leaf); |
| 193 | } else { |
| 194 | info->node_cache = leaf; |
| 195 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 196 | goto try_again; |
| 197 | } else { |
| 198 | msg = list_first_entry(&leaf->msg_list, |
| 199 | struct msg_msg, m_list); |
| 200 | list_del(&msg->m_list); |
| 201 | if (list_empty(&leaf->msg_list)) { |
| 202 | rb_erase(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 203 | if (info->node_cache) { |
| 204 | info->qsize -= sizeof(*leaf); |
| 205 | kfree(leaf); |
| 206 | } else { |
| 207 | info->node_cache = leaf; |
| 208 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 209 | } |
| 210 | } |
| 211 | info->attr.mq_curmsgs--; |
| 212 | info->qsize -= msg->m_ts; |
| 213 | return msg; |
| 214 | } |
| 215 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 216 | static struct inode *mqueue_get_inode(struct super_block *sb, |
Al Viro | 1b9d5ff7 | 2011-07-24 14:18:20 -0400 | [diff] [blame] | 217 | struct ipc_namespace *ipc_ns, umode_t mode, |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 218 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 220 | struct user_struct *u = current_user(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | struct inode *inode; |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 222 | int ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | inode = new_inode(sb); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 225 | if (!inode) |
| 226 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 228 | inode->i_ino = get_next_ino(); |
| 229 | inode->i_mode = mode; |
| 230 | inode->i_uid = current_fsuid(); |
| 231 | inode->i_gid = current_fsgid(); |
| 232 | inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 234 | if (S_ISREG(mode)) { |
| 235 | struct mqueue_inode_info *info; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 236 | unsigned long mq_bytes, mq_treesize; |
André Goddard Rosa | c8308b1 | 2010-02-23 04:04:23 -0300 | [diff] [blame] | 237 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 238 | inode->i_fop = &mqueue_file_operations; |
| 239 | inode->i_size = FILENT_SIZE; |
| 240 | /* mqueue specific info */ |
| 241 | info = MQUEUE_I(inode); |
| 242 | spin_lock_init(&info->lock); |
| 243 | init_waitqueue_head(&info->wait_q); |
| 244 | INIT_LIST_HEAD(&info->e_wait_q[0].list); |
| 245 | INIT_LIST_HEAD(&info->e_wait_q[1].list); |
| 246 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 247 | info->notify_user_ns = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 248 | info->qsize = 0; |
| 249 | info->user = NULL; /* set when all is ok */ |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 250 | info->msg_tree = RB_ROOT; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 251 | info->node_cache = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 252 | memset(&info->attr, 0, sizeof(info->attr)); |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 253 | info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, |
| 254 | ipc_ns->mq_msg_default); |
| 255 | info->attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, |
| 256 | ipc_ns->mq_msgsize_default); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 257 | if (attr) { |
| 258 | info->attr.mq_maxmsg = attr->mq_maxmsg; |
| 259 | info->attr.mq_msgsize = attr->mq_msgsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 261 | /* |
| 262 | * We used to allocate a static array of pointers and account |
| 263 | * the size of that array as well as one msg_msg struct per |
| 264 | * possible message into the queue size. That's no longer |
| 265 | * accurate as the queue is now an rbtree and will grow and |
| 266 | * shrink depending on usage patterns. We can, however, still |
| 267 | * account one msg_msg struct per message, but the nodes are |
| 268 | * allocated depending on priority usage, and most programs |
| 269 | * only use one, or a handful, of priorities. However, since |
| 270 | * this is pinned memory, we need to assume worst case, so |
| 271 | * that means the min(mq_maxmsg, max_priorities) * struct |
| 272 | * posix_msg_tree_node. |
| 273 | */ |
| 274 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 275 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 276 | sizeof(struct posix_msg_tree_node); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 277 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 278 | mq_bytes = mq_treesize + (info->attr.mq_maxmsg * |
| 279 | info->attr.mq_msgsize); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 280 | |
| 281 | spin_lock(&mq_lock); |
| 282 | if (u->mq_bytes + mq_bytes < u->mq_bytes || |
Davidlohr Bueso | 2a4e64b | 2012-01-20 14:34:01 -0800 | [diff] [blame] | 283 | u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) { |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 284 | spin_unlock(&mq_lock); |
| 285 | /* mqueue_evict_inode() releases info->messages */ |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 286 | ret = -EMFILE; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 287 | goto out_inode; |
| 288 | } |
| 289 | u->mq_bytes += mq_bytes; |
| 290 | spin_unlock(&mq_lock); |
| 291 | |
| 292 | /* all is ok */ |
| 293 | info->user = get_uid(u); |
| 294 | } else if (S_ISDIR(mode)) { |
| 295 | inc_nlink(inode); |
| 296 | /* Some things misbehave if size == 0 on a directory */ |
| 297 | inode->i_size = 2 * DIRENT_SIZE; |
| 298 | inode->i_op = &mqueue_dir_inode_operations; |
| 299 | inode->i_fop = &simple_dir_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | return inode; |
| 303 | out_inode: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | iput(inode); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 305 | err: |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 306 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | static int mqueue_fill_super(struct super_block *sb, void *data, int silent) |
| 310 | { |
| 311 | struct inode *inode; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 312 | struct ipc_namespace *ns = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 315 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 316 | sb->s_magic = MQUEUE_MAGIC; |
| 317 | sb->s_op = &mqueue_super_ops; |
| 318 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 319 | inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); |
| 320 | if (IS_ERR(inode)) |
| 321 | return PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 323 | sb->s_root = d_make_root(inode); |
| 324 | if (!sb->s_root) |
| 325 | return -ENOMEM; |
| 326 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 329 | static struct dentry *mqueue_mount(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 330 | int flags, const char *dev_name, |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 331 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | { |
Eric W. Biederman | a636b70 | 2013-03-21 18:13:15 -0700 | [diff] [blame] | 333 | if (!(flags & MS_KERNMOUNT)) { |
| 334 | struct ipc_namespace *ns = current->nsproxy->ipc_ns; |
| 335 | /* Don't allow mounting unless the caller has CAP_SYS_ADMIN |
| 336 | * over the ipc namespace. |
| 337 | */ |
| 338 | if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN)) |
| 339 | return ERR_PTR(-EPERM); |
| 340 | |
| 341 | data = ns; |
| 342 | } |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 343 | return mount_ns(fs_type, flags, data, mqueue_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 346 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | { |
| 348 | struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo; |
| 349 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 350 | inode_init_once(&p->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | static struct inode *mqueue_alloc_inode(struct super_block *sb) |
| 354 | { |
| 355 | struct mqueue_inode_info *ei; |
| 356 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 357 | ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | if (!ei) |
| 359 | return NULL; |
| 360 | return &ei->vfs_inode; |
| 361 | } |
| 362 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 363 | static void mqueue_i_callback(struct rcu_head *head) |
| 364 | { |
| 365 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 366 | kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode)); |
| 367 | } |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | static void mqueue_destroy_inode(struct inode *inode) |
| 370 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 371 | call_rcu(&inode->i_rcu, mqueue_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 374 | static void mqueue_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
| 376 | struct mqueue_inode_info *info; |
| 377 | struct user_struct *user; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 378 | unsigned long mq_bytes, mq_treesize; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 379 | struct ipc_namespace *ipc_ns; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 380 | struct msg_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 382 | clear_inode(inode); |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 383 | |
| 384 | if (S_ISDIR(inode->i_mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | return; |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 386 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 387 | ipc_ns = get_ns_from_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | info = MQUEUE_I(inode); |
| 389 | spin_lock(&info->lock); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 390 | while ((msg = msg_get(info)) != NULL) |
| 391 | free_msg(msg); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 392 | kfree(info->node_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | spin_unlock(&info->lock); |
| 394 | |
André Goddard Rosa | 8834cf7 | 2010-02-23 04:04:24 -0300 | [diff] [blame] | 395 | /* Total amount of bytes accounted for the mqueue */ |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 396 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 397 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 398 | sizeof(struct posix_msg_tree_node); |
| 399 | |
| 400 | mq_bytes = mq_treesize + (info->attr.mq_maxmsg * |
| 401 | info->attr.mq_msgsize); |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | user = info->user; |
| 404 | if (user) { |
| 405 | spin_lock(&mq_lock); |
| 406 | user->mq_bytes -= mq_bytes; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 407 | /* |
| 408 | * get_ns_from_inode() ensures that the |
| 409 | * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns |
| 410 | * to which we now hold a reference, or it is NULL. |
| 411 | * We can't put it here under mq_lock, though. |
| 412 | */ |
| 413 | if (ipc_ns) |
| 414 | ipc_ns->mq_queues_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | spin_unlock(&mq_lock); |
| 416 | free_uid(user); |
| 417 | } |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 418 | if (ipc_ns) |
| 419 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | static int mqueue_create(struct inode *dir, struct dentry *dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 423 | umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
| 425 | struct inode *inode; |
| 426 | struct mq_attr *attr = dentry->d_fsdata; |
| 427 | int error; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 428 | struct ipc_namespace *ipc_ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | spin_lock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 431 | ipc_ns = __get_ns_from_inode(dir); |
| 432 | if (!ipc_ns) { |
| 433 | error = -EACCES; |
| 434 | goto out_unlock; |
| 435 | } |
Doug Ledford | 02967ea | 2012-05-31 16:26:29 -0700 | [diff] [blame] | 436 | if (ipc_ns->mq_queues_count >= HARD_QUEUESMAX || |
| 437 | (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max && |
| 438 | !capable(CAP_SYS_RESOURCE))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | error = -ENOSPC; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 440 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 442 | ipc_ns->mq_queues_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | spin_unlock(&mq_lock); |
| 444 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 445 | inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 446 | if (IS_ERR(inode)) { |
| 447 | error = PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | spin_lock(&mq_lock); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 449 | ipc_ns->mq_queues_count--; |
| 450 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 453 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | dir->i_size += DIRENT_SIZE; |
| 455 | dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; |
| 456 | |
| 457 | d_instantiate(dentry, inode); |
| 458 | dget(dentry); |
| 459 | return 0; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 460 | out_unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | spin_unlock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 462 | if (ipc_ns) |
| 463 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | return error; |
| 465 | } |
| 466 | |
| 467 | static int mqueue_unlink(struct inode *dir, struct dentry *dentry) |
| 468 | { |
| 469 | struct inode *inode = dentry->d_inode; |
| 470 | |
| 471 | dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME; |
| 472 | dir->i_size -= DIRENT_SIZE; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 473 | drop_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | dput(dentry); |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * This is routine for system read from queue file. |
| 480 | * To avoid mess with doing here some sort of mq_receive we allow |
| 481 | * to read only queue size & notification info (the only values |
| 482 | * that are interesting from user point of view and aren't accessible |
| 483 | * through std routines) |
| 484 | */ |
| 485 | static ssize_t mqueue_read_file(struct file *filp, char __user *u_data, |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 486 | size_t count, loff_t *off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 488 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | char buffer[FILENT_SIZE]; |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 490 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | spin_lock(&info->lock); |
| 493 | snprintf(buffer, sizeof(buffer), |
| 494 | "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d\n", |
| 495 | info->qsize, |
| 496 | info->notify_owner ? info->notify.sigev_notify : 0, |
| 497 | (info->notify_owner && |
| 498 | info->notify.sigev_notify == SIGEV_SIGNAL) ? |
| 499 | info->notify.sigev_signo : 0, |
Pavel Emelyanov | 6c5f3e7 | 2008-02-08 04:19:20 -0800 | [diff] [blame] | 500 | pid_vnr(info->notify_owner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | spin_unlock(&info->lock); |
| 502 | buffer[sizeof(buffer)-1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 504 | ret = simple_read_from_buffer(u_data, count, off, buffer, |
| 505 | strlen(buffer)); |
| 506 | if (ret <= 0) |
| 507 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 509 | file_inode(filp)->i_atime = file_inode(filp)->i_ctime = CURRENT_TIME; |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 510 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 513 | static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 515 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
| 517 | spin_lock(&info->lock); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 518 | if (task_tgid(current) == info->notify_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | remove_notification(info); |
| 520 | |
| 521 | spin_unlock(&info->lock); |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) |
| 526 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 527 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | int retval = 0; |
| 529 | |
| 530 | poll_wait(filp, &info->wait_q, poll_tab); |
| 531 | |
| 532 | spin_lock(&info->lock); |
| 533 | if (info->attr.mq_curmsgs) |
| 534 | retval = POLLIN | POLLRDNORM; |
| 535 | |
| 536 | if (info->attr.mq_curmsgs < info->attr.mq_maxmsg) |
| 537 | retval |= POLLOUT | POLLWRNORM; |
| 538 | spin_unlock(&info->lock); |
| 539 | |
| 540 | return retval; |
| 541 | } |
| 542 | |
| 543 | /* Adds current to info->e_wait_q[sr] before element with smaller prio */ |
| 544 | static void wq_add(struct mqueue_inode_info *info, int sr, |
| 545 | struct ext_wait_queue *ewp) |
| 546 | { |
| 547 | struct ext_wait_queue *walk; |
| 548 | |
| 549 | ewp->task = current; |
| 550 | |
| 551 | list_for_each_entry(walk, &info->e_wait_q[sr].list, list) { |
| 552 | if (walk->task->static_prio <= current->static_prio) { |
| 553 | list_add_tail(&ewp->list, &walk->list); |
| 554 | return; |
| 555 | } |
| 556 | } |
| 557 | list_add_tail(&ewp->list, &info->e_wait_q[sr].list); |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * Puts current task to sleep. Caller must hold queue lock. After return |
| 562 | * lock isn't held. |
| 563 | * sr: SEND or RECV |
| 564 | */ |
| 565 | static int wq_sleep(struct mqueue_inode_info *info, int sr, |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 566 | ktime_t *timeout, struct ext_wait_queue *ewp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | { |
| 568 | int retval; |
| 569 | signed long time; |
| 570 | |
| 571 | wq_add(info, sr, ewp); |
| 572 | |
| 573 | for (;;) { |
| 574 | set_current_state(TASK_INTERRUPTIBLE); |
| 575 | |
| 576 | spin_unlock(&info->lock); |
Wanlong Gao | 32ea845 | 2011-10-31 17:06:35 -0700 | [diff] [blame] | 577 | time = schedule_hrtimeout_range_clock(timeout, 0, |
| 578 | HRTIMER_MODE_ABS, CLOCK_REALTIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | while (ewp->state == STATE_PENDING) |
| 581 | cpu_relax(); |
| 582 | |
| 583 | if (ewp->state == STATE_READY) { |
| 584 | retval = 0; |
| 585 | goto out; |
| 586 | } |
| 587 | spin_lock(&info->lock); |
| 588 | if (ewp->state == STATE_READY) { |
| 589 | retval = 0; |
| 590 | goto out_unlock; |
| 591 | } |
| 592 | if (signal_pending(current)) { |
| 593 | retval = -ERESTARTSYS; |
| 594 | break; |
| 595 | } |
| 596 | if (time == 0) { |
| 597 | retval = -ETIMEDOUT; |
| 598 | break; |
| 599 | } |
| 600 | } |
| 601 | list_del(&ewp->list); |
| 602 | out_unlock: |
| 603 | spin_unlock(&info->lock); |
| 604 | out: |
| 605 | return retval; |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Returns waiting task that should be serviced first or NULL if none exists |
| 610 | */ |
| 611 | static struct ext_wait_queue *wq_get_first_waiter( |
| 612 | struct mqueue_inode_info *info, int sr) |
| 613 | { |
| 614 | struct list_head *ptr; |
| 615 | |
| 616 | ptr = info->e_wait_q[sr].list.prev; |
| 617 | if (ptr == &info->e_wait_q[sr].list) |
| 618 | return NULL; |
| 619 | return list_entry(ptr, struct ext_wait_queue, list); |
| 620 | } |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | static inline void set_cookie(struct sk_buff *skb, char code) |
| 624 | { |
| 625 | ((char*)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
| 626 | } |
| 627 | |
| 628 | /* |
| 629 | * The next function is only to split too long sys_mq_timedsend |
| 630 | */ |
| 631 | static void __do_notify(struct mqueue_inode_info *info) |
| 632 | { |
| 633 | /* notification |
| 634 | * invoked when there is registered process and there isn't process |
| 635 | * waiting synchronously for message AND state of queue changed from |
| 636 | * empty to not empty. Here we are sure that no one is waiting |
| 637 | * synchronously. */ |
| 638 | if (info->notify_owner && |
| 639 | info->attr.mq_curmsgs == 1) { |
| 640 | struct siginfo sig_i; |
| 641 | switch (info->notify.sigev_notify) { |
| 642 | case SIGEV_NONE: |
| 643 | break; |
| 644 | case SIGEV_SIGNAL: |
| 645 | /* sends signal */ |
| 646 | |
| 647 | sig_i.si_signo = info->notify.sigev_signo; |
| 648 | sig_i.si_errno = 0; |
| 649 | sig_i.si_code = SI_MESGQ; |
| 650 | sig_i.si_value = info->notify.sigev_value; |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 651 | /* map current pid/uid into info->owner's namespaces */ |
| 652 | rcu_read_lock(); |
Sukadev Bhattiprolu | a668499 | 2009-01-07 18:08:50 -0800 | [diff] [blame] | 653 | sig_i.si_pid = task_tgid_nr_ns(current, |
| 654 | ns_of_pid(info->notify_owner)); |
Eric W. Biederman | 76b6db0 | 2012-03-14 15:24:19 -0700 | [diff] [blame] | 655 | sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid()); |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 656 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 658 | kill_pid_info(info->notify.sigev_signo, |
| 659 | &sig_i, info->notify_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | break; |
| 661 | case SIGEV_THREAD: |
| 662 | set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 663 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | break; |
| 665 | } |
| 666 | /* after notification unregisters process */ |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 667 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 668 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 669 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 670 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | wake_up(&info->wait_q); |
| 673 | } |
| 674 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 675 | static int prepare_timeout(const struct timespec __user *u_abs_timeout, |
| 676 | ktime_t *expires, struct timespec *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 678 | if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec))) |
| 679 | return -EFAULT; |
| 680 | if (!timespec_valid(ts)) |
| 681 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 683 | *expires = timespec_to_ktime(*ts); |
| 684 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | static void remove_notification(struct mqueue_inode_info *info) |
| 688 | { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 689 | if (info->notify_owner != NULL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | info->notify.sigev_notify == SIGEV_THREAD) { |
| 691 | set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 692 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 694 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 695 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 696 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 697 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 700 | static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | { |
Doug Ledford | 2c12ea4 | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 702 | int mq_treesize; |
| 703 | unsigned long total_size; |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 706 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | if (capable(CAP_SYS_RESOURCE)) { |
Doug Ledford | 02967ea | 2012-05-31 16:26:29 -0700 | [diff] [blame] | 708 | if (attr->mq_maxmsg > HARD_MSGMAX || |
| 709 | attr->mq_msgsize > HARD_MSGSIZEMAX) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 710 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } else { |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 712 | if (attr->mq_maxmsg > ipc_ns->mq_msg_max || |
| 713 | attr->mq_msgsize > ipc_ns->mq_msgsize_max) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 714 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | /* check for overflow */ |
| 717 | if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 718 | return -EOVERFLOW; |
Doug Ledford | 2c12ea4 | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 719 | mq_treesize = attr->mq_maxmsg * sizeof(struct msg_msg) + |
| 720 | min_t(unsigned int, attr->mq_maxmsg, MQ_PRIO_MAX) * |
| 721 | sizeof(struct posix_msg_tree_node); |
| 722 | total_size = attr->mq_maxmsg * attr->mq_msgsize; |
| 723 | if (total_size + mq_treesize < total_size) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 724 | return -EOVERFLOW; |
| 725 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Invoked when creating a new queue via sys_mq_open |
| 730 | */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 731 | static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir, |
| 732 | struct path *path, int oflag, umode_t mode, |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 733 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 735 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | int ret; |
| 737 | |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 738 | if (attr) { |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 739 | ret = mq_attr_ok(ipc_ns, attr); |
| 740 | if (ret) |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 741 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | /* store for use during create */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 743 | path->dentry->d_fsdata = attr; |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 744 | } else { |
| 745 | struct mq_attr def_attr; |
| 746 | |
| 747 | def_attr.mq_maxmsg = min(ipc_ns->mq_msg_max, |
| 748 | ipc_ns->mq_msg_default); |
| 749 | def_attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, |
| 750 | ipc_ns->mq_msgsize_default); |
| 751 | ret = mq_attr_ok(ipc_ns, &def_attr); |
| 752 | if (ret) |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 753 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 756 | mode &= ~current_umask(); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 757 | ret = vfs_create(dir, path->dentry, mode, true); |
| 758 | path->dentry->d_fsdata = NULL; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 759 | if (ret) |
| 760 | return ERR_PTR(ret); |
| 761 | return dentry_open(path, oflag, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /* Opens existing queue */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 765 | static struct file *do_open(struct path *path, int oflag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 767 | static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, |
| 768 | MAY_READ | MAY_WRITE }; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 769 | int acc; |
| 770 | if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) |
| 771 | return ERR_PTR(-EINVAL); |
| 772 | acc = oflag2acc[oflag & O_ACCMODE]; |
| 773 | if (inode_permission(path->dentry->d_inode, acc)) |
| 774 | return ERR_PTR(-EACCES); |
| 775 | return dentry_open(path, oflag, current_cred()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Al Viro | df0a428 | 2011-07-26 05:26:10 -0400 | [diff] [blame] | 778 | SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, |
Heiko Carstens | d5460c9 | 2009-01-14 14:14:27 +0100 | [diff] [blame] | 779 | struct mq_attr __user *, u_attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 781 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | struct file *filp; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 783 | struct filename *name; |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 784 | struct mq_attr attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | int fd, error; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 786 | struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 787 | struct vfsmount *mnt = ipc_ns->mq_mnt; |
| 788 | struct dentry *root = mnt->mnt_root; |
| 789 | int ro; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 791 | if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) |
| 792 | return -EFAULT; |
| 793 | |
| 794 | audit_mq_open(oflag, mode, u_attr ? &attr : NULL); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | if (IS_ERR(name = getname(u_name))) |
| 797 | return PTR_ERR(name); |
| 798 | |
Ulrich Drepper | 269f213 | 2008-05-03 15:28:45 -0400 | [diff] [blame] | 799 | fd = get_unused_fd_flags(O_CLOEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | if (fd < 0) |
| 801 | goto out_putname; |
| 802 | |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 803 | ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 804 | error = 0; |
| 805 | mutex_lock(&root->d_inode->i_mutex); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 806 | path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 807 | if (IS_ERR(path.dentry)) { |
| 808 | error = PTR_ERR(path.dentry); |
André Goddard Rosa | 4294a8e | 2010-02-23 04:04:28 -0300 | [diff] [blame] | 809 | goto out_putfd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 811 | path.mnt = mntget(mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | if (oflag & O_CREAT) { |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 814 | if (path.dentry->d_inode) { /* entry already exists */ |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 815 | audit_inode(name, path.dentry, 0); |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 816 | if (oflag & O_EXCL) { |
| 817 | error = -EEXIST; |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 818 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 819 | } |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 820 | filp = do_open(&path, oflag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } else { |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 822 | if (ro) { |
| 823 | error = ro; |
| 824 | goto out; |
| 825 | } |
Jeff Layton | 79f6530 | 2013-07-08 15:59:36 -0700 | [diff] [blame] | 826 | audit_inode_parent_hidden(name, root); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 827 | filp = do_create(ipc_ns, root->d_inode, |
| 828 | &path, oflag, mode, |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 829 | u_attr ? &attr : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 831 | } else { |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 832 | if (!path.dentry->d_inode) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 833 | error = -ENOENT; |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 834 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 835 | } |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 836 | audit_inode(name, path.dentry, 0); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 837 | filp = do_open(&path, oflag); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 838 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 840 | if (!IS_ERR(filp)) |
| 841 | fd_install(fd, filp); |
| 842 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | error = PTR_ERR(filp); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 844 | out: |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 845 | path_put(&path); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 846 | out_putfd: |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 847 | if (error) { |
| 848 | put_unused_fd(fd); |
| 849 | fd = error; |
| 850 | } |
| 851 | mutex_unlock(&root->d_inode->i_mutex); |
Vladimir Davydov | 38d78e5 | 2013-03-22 15:04:51 -0700 | [diff] [blame] | 852 | if (!ro) |
| 853 | mnt_drop_write(mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | out_putname: |
| 855 | putname(name); |
| 856 | return fd; |
| 857 | } |
| 858 | |
Heiko Carstens | d5460c9 | 2009-01-14 14:14:27 +0100 | [diff] [blame] | 859 | SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | { |
| 861 | int err; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 862 | struct filename *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | struct dentry *dentry; |
| 864 | struct inode *inode = NULL; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 865 | struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 866 | struct vfsmount *mnt = ipc_ns->mq_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
| 868 | name = getname(u_name); |
| 869 | if (IS_ERR(name)) |
| 870 | return PTR_ERR(name); |
| 871 | |
Jeff Layton | 79f6530 | 2013-07-08 15:59:36 -0700 | [diff] [blame] | 872 | audit_inode_parent_hidden(name, mnt->mnt_root); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 873 | err = mnt_want_write(mnt); |
| 874 | if (err) |
| 875 | goto out_name; |
| 876 | mutex_lock_nested(&mnt->mnt_root->d_inode->i_mutex, I_MUTEX_PARENT); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 877 | dentry = lookup_one_len(name->name, mnt->mnt_root, |
| 878 | strlen(name->name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | if (IS_ERR(dentry)) { |
| 880 | err = PTR_ERR(dentry); |
| 881 | goto out_unlock; |
| 882 | } |
| 883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | inode = dentry->d_inode; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 885 | if (!inode) { |
| 886 | err = -ENOENT; |
| 887 | } else { |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 888 | ihold(inode); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 889 | err = vfs_unlink(dentry->d_parent->d_inode, dentry); |
| 890 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | dput(dentry); |
| 892 | |
| 893 | out_unlock: |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 894 | mutex_unlock(&mnt->mnt_root->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | if (inode) |
| 896 | iput(inode); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 897 | mnt_drop_write(mnt); |
| 898 | out_name: |
| 899 | putname(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
| 901 | return err; |
| 902 | } |
| 903 | |
| 904 | /* Pipelined send and receive functions. |
| 905 | * |
| 906 | * If a receiver finds no waiting message, then it registers itself in the |
| 907 | * list of waiting receivers. A sender checks that list before adding the new |
| 908 | * message into the message array. If there is a waiting receiver, then it |
| 909 | * bypasses the message array and directly hands the message over to the |
| 910 | * receiver. |
| 911 | * The receiver accepts the message and returns without grabbing the queue |
| 912 | * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers |
| 913 | * are necessary. The same algorithm is used for sysv semaphores, see |
Serge E. Hallyn | 7b7a317 | 2006-03-28 01:56:23 -0800 | [diff] [blame] | 914 | * ipc/sem.c for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | * |
| 916 | * The same algorithm is used for senders. |
| 917 | */ |
| 918 | |
| 919 | /* pipelined_send() - send a message directly to the task waiting in |
| 920 | * sys_mq_timedreceive() (without inserting message into a queue). |
| 921 | */ |
| 922 | static inline void pipelined_send(struct mqueue_inode_info *info, |
| 923 | struct msg_msg *message, |
| 924 | struct ext_wait_queue *receiver) |
| 925 | { |
| 926 | receiver->msg = message; |
| 927 | list_del(&receiver->list); |
| 928 | receiver->state = STATE_PENDING; |
| 929 | wake_up_process(receiver->task); |
akpm@osdl.org | d59dd46 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 930 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | receiver->state = STATE_READY; |
| 932 | } |
| 933 | |
| 934 | /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() |
| 935 | * gets its message and put to the queue (we have one free place for sure). */ |
| 936 | static inline void pipelined_receive(struct mqueue_inode_info *info) |
| 937 | { |
| 938 | struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND); |
| 939 | |
| 940 | if (!sender) { |
| 941 | /* for poll */ |
| 942 | wake_up_interruptible(&info->wait_q); |
| 943 | return; |
| 944 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 945 | if (msg_insert(sender->msg, info)) |
| 946 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | list_del(&sender->list); |
| 948 | sender->state = STATE_PENDING; |
| 949 | wake_up_process(sender->task); |
akpm@osdl.org | d59dd46 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 950 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | sender->state = STATE_READY; |
| 952 | } |
| 953 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 954 | SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, |
| 955 | size_t, msg_len, unsigned int, msg_prio, |
| 956 | const struct timespec __user *, u_abs_timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 958 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | struct inode *inode; |
| 960 | struct ext_wait_queue wait; |
| 961 | struct ext_wait_queue *receiver; |
| 962 | struct msg_msg *msg_ptr; |
| 963 | struct mqueue_inode_info *info; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 964 | ktime_t expires, *timeout = NULL; |
| 965 | struct timespec ts; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 966 | struct posix_msg_tree_node *new_leaf = NULL; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 967 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 969 | if (u_abs_timeout) { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 970 | int res = prepare_timeout(u_abs_timeout, &expires, &ts); |
| 971 | if (res) |
| 972 | return res; |
| 973 | timeout = &expires; |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 974 | } |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) |
| 977 | return -EINVAL; |
| 978 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 979 | audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 981 | f = fdget(mqdes); |
| 982 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 983 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 985 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 987 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 988 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 989 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 991 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | info = MQUEUE_I(inode); |
Jeff Layton | bfcec70 | 2012-10-10 15:25:23 -0400 | [diff] [blame] | 993 | audit_inode(NULL, f.file->f_path.dentry, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 995 | if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 996 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 998 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | if (unlikely(msg_len > info->attr.mq_msgsize)) { |
| 1001 | ret = -EMSGSIZE; |
| 1002 | goto out_fput; |
| 1003 | } |
| 1004 | |
| 1005 | /* First try to allocate memory, before doing anything with |
| 1006 | * existing queues. */ |
| 1007 | msg_ptr = load_msg(u_msg_ptr, msg_len); |
| 1008 | if (IS_ERR(msg_ptr)) { |
| 1009 | ret = PTR_ERR(msg_ptr); |
| 1010 | goto out_fput; |
| 1011 | } |
| 1012 | msg_ptr->m_ts = msg_len; |
| 1013 | msg_ptr->m_type = msg_prio; |
| 1014 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1015 | /* |
| 1016 | * msg_insert really wants us to have a valid, spare node struct so |
| 1017 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1018 | * fall back to that if necessary. |
| 1019 | */ |
| 1020 | if (!info->node_cache) |
| 1021 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | spin_lock(&info->lock); |
| 1024 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1025 | if (!info->node_cache && new_leaf) { |
| 1026 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1027 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1028 | info->node_cache = new_leaf; |
| 1029 | info->qsize += sizeof(*new_leaf); |
| 1030 | new_leaf = NULL; |
| 1031 | } else { |
| 1032 | kfree(new_leaf); |
| 1033 | } |
| 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1036 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } else { |
| 1039 | wait.task = current; |
| 1040 | wait.msg = (void *) msg_ptr; |
| 1041 | wait.state = STATE_NONE; |
| 1042 | ret = wq_sleep(info, SEND, timeout, &wait); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1043 | /* |
| 1044 | * wq_sleep must be called with info->lock held, and |
| 1045 | * returns with the lock released |
| 1046 | */ |
| 1047 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | } else { |
| 1050 | receiver = wq_get_first_waiter(info, RECV); |
| 1051 | if (receiver) { |
| 1052 | pipelined_send(info, msg_ptr, receiver); |
| 1053 | } else { |
| 1054 | /* adds message to the queue */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1055 | ret = msg_insert(msg_ptr, info); |
| 1056 | if (ret) |
| 1057 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | __do_notify(info); |
| 1059 | } |
| 1060 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
| 1061 | CURRENT_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1063 | out_unlock: |
| 1064 | spin_unlock(&info->lock); |
| 1065 | out_free: |
| 1066 | if (ret) |
| 1067 | free_msg(msg_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1069 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | out: |
| 1071 | return ret; |
| 1072 | } |
| 1073 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1074 | SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, |
| 1075 | size_t, msg_len, unsigned int __user *, u_msg_prio, |
| 1076 | const struct timespec __user *, u_abs_timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | ssize_t ret; |
| 1079 | struct msg_msg *msg_ptr; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1080 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | struct inode *inode; |
| 1082 | struct mqueue_inode_info *info; |
| 1083 | struct ext_wait_queue wait; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1084 | ktime_t expires, *timeout = NULL; |
| 1085 | struct timespec ts; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1086 | struct posix_msg_tree_node *new_leaf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 1088 | if (u_abs_timeout) { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1089 | int res = prepare_timeout(u_abs_timeout, &expires, &ts); |
| 1090 | if (res) |
| 1091 | return res; |
| 1092 | timeout = &expires; |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 1093 | } |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1094 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1095 | audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1097 | f = fdget(mqdes); |
| 1098 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1099 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1101 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1103 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1104 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1105 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1107 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | info = MQUEUE_I(inode); |
Jeff Layton | bfcec70 | 2012-10-10 15:25:23 -0400 | [diff] [blame] | 1109 | audit_inode(NULL, f.file->f_path.dentry, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1111 | if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1112 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1114 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | /* checks if buffer is big enough */ |
| 1117 | if (unlikely(msg_len < info->attr.mq_msgsize)) { |
| 1118 | ret = -EMSGSIZE; |
| 1119 | goto out_fput; |
| 1120 | } |
| 1121 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1122 | /* |
| 1123 | * msg_insert really wants us to have a valid, spare node struct so |
| 1124 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1125 | * fall back to that if necessary. |
| 1126 | */ |
| 1127 | if (!info->node_cache) |
| 1128 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | spin_lock(&info->lock); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1131 | |
| 1132 | if (!info->node_cache && new_leaf) { |
| 1133 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1134 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1135 | info->node_cache = new_leaf; |
| 1136 | info->qsize += sizeof(*new_leaf); |
| 1137 | } else { |
| 1138 | kfree(new_leaf); |
| 1139 | } |
| 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | if (info->attr.mq_curmsgs == 0) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1142 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | spin_unlock(&info->lock); |
| 1144 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | } else { |
| 1146 | wait.task = current; |
| 1147 | wait.state = STATE_NONE; |
| 1148 | ret = wq_sleep(info, RECV, timeout, &wait); |
| 1149 | msg_ptr = wait.msg; |
| 1150 | } |
| 1151 | } else { |
| 1152 | msg_ptr = msg_get(info); |
| 1153 | |
| 1154 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
| 1155 | CURRENT_TIME; |
| 1156 | |
| 1157 | /* There is now free space in queue. */ |
| 1158 | pipelined_receive(info); |
| 1159 | spin_unlock(&info->lock); |
| 1160 | ret = 0; |
| 1161 | } |
| 1162 | if (ret == 0) { |
| 1163 | ret = msg_ptr->m_ts; |
| 1164 | |
| 1165 | if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) || |
| 1166 | store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) { |
| 1167 | ret = -EFAULT; |
| 1168 | } |
| 1169 | free_msg(msg_ptr); |
| 1170 | } |
| 1171 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1172 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | out: |
| 1174 | return ret; |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * Notes: the case when user wants us to deregister (with NULL as pointer) |
| 1179 | * and he isn't currently owner of notification, will be silently discarded. |
| 1180 | * It isn't explicitly defined in the POSIX. |
| 1181 | */ |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1182 | SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
| 1183 | const struct sigevent __user *, u_notification) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1185 | int ret; |
| 1186 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | struct sock *sock; |
| 1188 | struct inode *inode; |
| 1189 | struct sigevent notification; |
| 1190 | struct mqueue_inode_info *info; |
| 1191 | struct sk_buff *nc; |
| 1192 | |
Al Viro | 20114f7 | 2008-12-10 07:16:12 -0500 | [diff] [blame] | 1193 | if (u_notification) { |
| 1194 | if (copy_from_user(¬ification, u_notification, |
| 1195 | sizeof(struct sigevent))) |
| 1196 | return -EFAULT; |
| 1197 | } |
| 1198 | |
| 1199 | audit_mq_notify(mqdes, u_notification ? ¬ification : NULL); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | nc = NULL; |
| 1202 | sock = NULL; |
| 1203 | if (u_notification != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | if (unlikely(notification.sigev_notify != SIGEV_NONE && |
| 1205 | notification.sigev_notify != SIGEV_SIGNAL && |
| 1206 | notification.sigev_notify != SIGEV_THREAD)) |
| 1207 | return -EINVAL; |
| 1208 | if (notification.sigev_notify == SIGEV_SIGNAL && |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 1209 | !valid_signal(notification.sigev_signo)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | return -EINVAL; |
| 1211 | } |
| 1212 | if (notification.sigev_notify == SIGEV_THREAD) { |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1213 | long timeo; |
| 1214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | /* create the notify skb */ |
| 1216 | nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1217 | if (!nc) { |
| 1218 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | if (copy_from_user(nc->data, |
| 1222 | notification.sigev_value.sival_ptr, |
| 1223 | NOTIFY_COOKIE_LEN)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1224 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | goto out; |
| 1226 | } |
| 1227 | |
| 1228 | /* TODO: add a header? */ |
| 1229 | skb_put(nc, NOTIFY_COOKIE_LEN); |
| 1230 | /* and attach it to the socket */ |
| 1231 | retry: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1232 | f = fdget(notification.sigev_signo); |
| 1233 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1234 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1236 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1237 | sock = netlink_getsockbyfilp(f.file); |
| 1238 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | if (IS_ERR(sock)) { |
| 1240 | ret = PTR_ERR(sock); |
| 1241 | sock = NULL; |
| 1242 | goto out; |
| 1243 | } |
| 1244 | |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1245 | timeo = MAX_SCHEDULE_TIMEOUT; |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1246 | ret = netlink_attachskb(sock, nc, &timeo, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | if (ret == 1) |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1248 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | if (ret) { |
| 1250 | sock = NULL; |
| 1251 | nc = NULL; |
| 1252 | goto out; |
| 1253 | } |
| 1254 | } |
| 1255 | } |
| 1256 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1257 | f = fdget(mqdes); |
| 1258 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1259 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1263 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1264 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1265 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | info = MQUEUE_I(inode); |
| 1269 | |
| 1270 | ret = 0; |
| 1271 | spin_lock(&info->lock); |
| 1272 | if (u_notification == NULL) { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1273 | if (info->notify_owner == task_tgid(current)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | remove_notification(info); |
| 1275 | inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 1276 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1277 | } else if (info->notify_owner != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | ret = -EBUSY; |
| 1279 | } else { |
| 1280 | switch (notification.sigev_notify) { |
| 1281 | case SIGEV_NONE: |
| 1282 | info->notify.sigev_notify = SIGEV_NONE; |
| 1283 | break; |
| 1284 | case SIGEV_THREAD: |
| 1285 | info->notify_sock = sock; |
| 1286 | info->notify_cookie = nc; |
| 1287 | sock = NULL; |
| 1288 | nc = NULL; |
| 1289 | info->notify.sigev_notify = SIGEV_THREAD; |
| 1290 | break; |
| 1291 | case SIGEV_SIGNAL: |
| 1292 | info->notify.sigev_signo = notification.sigev_signo; |
| 1293 | info->notify.sigev_value = notification.sigev_value; |
| 1294 | info->notify.sigev_notify = SIGEV_SIGNAL; |
| 1295 | break; |
| 1296 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1297 | |
| 1298 | info->notify_owner = get_pid(task_tgid(current)); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 1299 | info->notify_user_ns = get_user_ns(current_user_ns()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 1301 | } |
| 1302 | spin_unlock(&info->lock); |
| 1303 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1304 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | out: |
| 1306 | if (sock) { |
| 1307 | netlink_detachskb(sock, nc); |
| 1308 | } else if (nc) { |
| 1309 | dev_kfree_skb(nc); |
| 1310 | } |
| 1311 | return ret; |
| 1312 | } |
| 1313 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1314 | SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
| 1315 | const struct mq_attr __user *, u_mqstat, |
| 1316 | struct mq_attr __user *, u_omqstat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | { |
| 1318 | int ret; |
| 1319 | struct mq_attr mqstat, omqstat; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1320 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | struct inode *inode; |
| 1322 | struct mqueue_inode_info *info; |
| 1323 | |
| 1324 | if (u_mqstat != NULL) { |
| 1325 | if (copy_from_user(&mqstat, u_mqstat, sizeof(struct mq_attr))) |
| 1326 | return -EFAULT; |
| 1327 | if (mqstat.mq_flags & (~O_NONBLOCK)) |
| 1328 | return -EINVAL; |
| 1329 | } |
| 1330 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1331 | f = fdget(mqdes); |
| 1332 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1333 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1335 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1337 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1338 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1339 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1341 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | info = MQUEUE_I(inode); |
| 1343 | |
| 1344 | spin_lock(&info->lock); |
| 1345 | |
| 1346 | omqstat = info->attr; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1347 | omqstat.mq_flags = f.file->f_flags & O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | if (u_mqstat) { |
Al Viro | 7392906 | 2008-12-10 06:58:59 -0500 | [diff] [blame] | 1349 | audit_mq_getsetattr(mqdes, &mqstat); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1350 | spin_lock(&f.file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | if (mqstat.mq_flags & O_NONBLOCK) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1352 | f.file->f_flags |= O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | else |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1354 | f.file->f_flags &= ~O_NONBLOCK; |
| 1355 | spin_unlock(&f.file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
| 1357 | inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 1358 | } |
| 1359 | |
| 1360 | spin_unlock(&info->lock); |
| 1361 | |
| 1362 | ret = 0; |
| 1363 | if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat, |
| 1364 | sizeof(struct mq_attr))) |
| 1365 | ret = -EFAULT; |
| 1366 | |
| 1367 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1368 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | out: |
| 1370 | return ret; |
| 1371 | } |
| 1372 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 1373 | static const struct inode_operations mqueue_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | .lookup = simple_lookup, |
| 1375 | .create = mqueue_create, |
| 1376 | .unlink = mqueue_unlink, |
| 1377 | }; |
| 1378 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 1379 | static const struct file_operations mqueue_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | .flush = mqueue_flush_file, |
| 1381 | .poll = mqueue_poll_file, |
| 1382 | .read = mqueue_read_file, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1383 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | }; |
| 1385 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1386 | static const struct super_operations mqueue_super_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | .alloc_inode = mqueue_alloc_inode, |
| 1388 | .destroy_inode = mqueue_destroy_inode, |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 1389 | .evict_inode = mqueue_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | .statfs = simple_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | }; |
| 1392 | |
| 1393 | static struct file_system_type mqueue_fs_type = { |
| 1394 | .name = "mqueue", |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 1395 | .mount = mqueue_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | .kill_sb = kill_litter_super, |
Gao feng | bc1b69e | 2013-01-28 11:09:01 +0800 | [diff] [blame] | 1397 | .fs_flags = FS_USERNS_MOUNT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | }; |
| 1399 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1400 | int mq_init_ns(struct ipc_namespace *ns) |
| 1401 | { |
| 1402 | ns->mq_queues_count = 0; |
| 1403 | ns->mq_queues_max = DFLT_QUEUESMAX; |
| 1404 | ns->mq_msg_max = DFLT_MSGMAX; |
| 1405 | ns->mq_msgsize_max = DFLT_MSGSIZEMAX; |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 1406 | ns->mq_msg_default = DFLT_MSG; |
| 1407 | ns->mq_msgsize_default = DFLT_MSGSIZE; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1408 | |
| 1409 | ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns); |
| 1410 | if (IS_ERR(ns->mq_mnt)) { |
| 1411 | int err = PTR_ERR(ns->mq_mnt); |
| 1412 | ns->mq_mnt = NULL; |
| 1413 | return err; |
| 1414 | } |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
| 1418 | void mq_clear_sbinfo(struct ipc_namespace *ns) |
| 1419 | { |
| 1420 | ns->mq_mnt->mnt_sb->s_fs_info = NULL; |
| 1421 | } |
| 1422 | |
| 1423 | void mq_put_mnt(struct ipc_namespace *ns) |
| 1424 | { |
Al Viro | 6f68657 | 2011-12-09 00:38:50 -0500 | [diff] [blame] | 1425 | kern_unmount(ns->mq_mnt); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | static int __init init_mqueue_fs(void) |
| 1429 | { |
| 1430 | int error; |
| 1431 | |
| 1432 | mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache", |
| 1433 | sizeof(struct mqueue_inode_info), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1434 | SLAB_HWCACHE_ALIGN, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | if (mqueue_inode_cachep == NULL) |
| 1436 | return -ENOMEM; |
| 1437 | |
André Goddard Rosa | 2329e39 | 2010-02-23 04:04:27 -0300 | [diff] [blame] | 1438 | /* ignore failures - they are not fatal */ |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 1439 | mq_sysctl_table = mq_register_sysctl_table(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | error = register_filesystem(&mqueue_fs_type); |
| 1442 | if (error) |
| 1443 | goto out_sysctl; |
| 1444 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1445 | spin_lock_init(&mq_lock); |
| 1446 | |
Al Viro | 6f68657 | 2011-12-09 00:38:50 -0500 | [diff] [blame] | 1447 | error = mq_init_ns(&init_ipc_ns); |
| 1448 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | goto out_filesystem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | return 0; |
| 1452 | |
| 1453 | out_filesystem: |
| 1454 | unregister_filesystem(&mqueue_fs_type); |
| 1455 | out_sysctl: |
| 1456 | if (mq_sysctl_table) |
| 1457 | unregister_sysctl_table(mq_sysctl_table); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1458 | kmem_cache_destroy(mqueue_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | return error; |
| 1460 | } |
| 1461 | |
| 1462 | __initcall(init_mqueue_fs); |