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: |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 9 | * Manfred Spraul (manfred@colorfullife.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 50 | #define STATE_READY 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 52 | struct posix_msg_tree_node { |
| 53 | struct rb_node rb_node; |
| 54 | struct list_head msg_list; |
| 55 | int priority; |
| 56 | }; |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | struct ext_wait_queue { /* queue of sleeping tasks */ |
| 59 | struct task_struct *task; |
| 60 | struct list_head list; |
| 61 | struct msg_msg *msg; /* ptr of loaded message */ |
| 62 | int state; /* one of STATE_* values */ |
| 63 | }; |
| 64 | |
| 65 | struct mqueue_inode_info { |
| 66 | spinlock_t lock; |
| 67 | struct inode vfs_inode; |
| 68 | wait_queue_head_t wait_q; |
| 69 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 70 | struct rb_root msg_tree; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 71 | struct posix_msg_tree_node *node_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | struct mq_attr attr; |
| 73 | |
| 74 | struct sigevent notify; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 75 | struct pid *notify_owner; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 76 | struct user_namespace *notify_user_ns; |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 77 | struct user_struct *user; /* user who created, for accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | struct sock *notify_sock; |
| 79 | struct sk_buff *notify_cookie; |
| 80 | |
| 81 | /* for tasks waiting for free space and messages, respectively */ |
| 82 | struct ext_wait_queue e_wait_q[2]; |
| 83 | |
| 84 | unsigned long qsize; /* size of queue in memory (sum of all msgs) */ |
| 85 | }; |
| 86 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 87 | static const struct inode_operations mqueue_dir_inode_operations; |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 88 | static const struct file_operations mqueue_file_operations; |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 89 | static const struct super_operations mqueue_super_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | static void remove_notification(struct mqueue_inode_info *info); |
| 91 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 92 | static struct kmem_cache *mqueue_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 94 | static struct ctl_table_header *mq_sysctl_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode) |
| 97 | { |
| 98 | return container_of(inode, struct mqueue_inode_info, vfs_inode); |
| 99 | } |
| 100 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 101 | /* |
| 102 | * This routine should be called with the mq_lock held. |
| 103 | */ |
| 104 | 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] | 105 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 106 | return get_ipc_ns(inode->i_sb->s_fs_info); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 109 | static struct ipc_namespace *get_ns_from_inode(struct inode *inode) |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 110 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 111 | struct ipc_namespace *ns; |
| 112 | |
| 113 | spin_lock(&mq_lock); |
| 114 | ns = __get_ns_from_inode(inode); |
| 115 | spin_unlock(&mq_lock); |
| 116 | return ns; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 119 | /* Auxiliary functions to manipulate messages' list */ |
| 120 | static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info) |
| 121 | { |
| 122 | struct rb_node **p, *parent = NULL; |
| 123 | struct posix_msg_tree_node *leaf; |
| 124 | |
| 125 | p = &info->msg_tree.rb_node; |
| 126 | while (*p) { |
| 127 | parent = *p; |
| 128 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
| 129 | |
| 130 | if (likely(leaf->priority == msg->m_type)) |
| 131 | goto insert_msg; |
| 132 | else if (msg->m_type < leaf->priority) |
| 133 | p = &(*p)->rb_left; |
| 134 | else |
| 135 | p = &(*p)->rb_right; |
| 136 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 137 | if (info->node_cache) { |
| 138 | leaf = info->node_cache; |
| 139 | info->node_cache = NULL; |
| 140 | } else { |
| 141 | leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC); |
| 142 | if (!leaf) |
| 143 | return -ENOMEM; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 144 | INIT_LIST_HEAD(&leaf->msg_list); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 145 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 146 | leaf->priority = msg->m_type; |
| 147 | rb_link_node(&leaf->rb_node, parent, p); |
| 148 | rb_insert_color(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 149 | insert_msg: |
| 150 | info->attr.mq_curmsgs++; |
| 151 | info->qsize += msg->m_ts; |
| 152 | list_add_tail(&msg->m_list, &leaf->msg_list); |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) |
| 157 | { |
| 158 | struct rb_node **p, *parent = NULL; |
| 159 | struct posix_msg_tree_node *leaf; |
| 160 | struct msg_msg *msg; |
| 161 | |
| 162 | try_again: |
| 163 | p = &info->msg_tree.rb_node; |
| 164 | while (*p) { |
| 165 | parent = *p; |
| 166 | /* |
| 167 | * During insert, low priorities go to the left and high to the |
| 168 | * right. On receive, we want the highest priorities first, so |
| 169 | * walk all the way to the right. |
| 170 | */ |
| 171 | p = &(*p)->rb_right; |
| 172 | } |
| 173 | if (!parent) { |
| 174 | if (info->attr.mq_curmsgs) { |
| 175 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 176 | "no tree element, but supposedly messages " |
| 177 | "should exist!\n"); |
| 178 | info->attr.mq_curmsgs = 0; |
| 179 | } |
| 180 | return NULL; |
| 181 | } |
| 182 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 183 | if (unlikely(list_empty(&leaf->msg_list))) { |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 184 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 185 | "empty leaf node but we haven't implemented " |
| 186 | "lazy leaf delete!\n"); |
| 187 | rb_erase(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 188 | if (info->node_cache) { |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 189 | kfree(leaf); |
| 190 | } else { |
| 191 | info->node_cache = leaf; |
| 192 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 193 | goto try_again; |
| 194 | } else { |
| 195 | msg = list_first_entry(&leaf->msg_list, |
| 196 | struct msg_msg, m_list); |
| 197 | list_del(&msg->m_list); |
| 198 | if (list_empty(&leaf->msg_list)) { |
| 199 | rb_erase(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 200 | if (info->node_cache) { |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 201 | kfree(leaf); |
| 202 | } else { |
| 203 | info->node_cache = leaf; |
| 204 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 205 | } |
| 206 | } |
| 207 | info->attr.mq_curmsgs--; |
| 208 | info->qsize -= msg->m_ts; |
| 209 | return msg; |
| 210 | } |
| 211 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 212 | static struct inode *mqueue_get_inode(struct super_block *sb, |
Al Viro | 1b9d5ff7 | 2011-07-24 14:18:20 -0400 | [diff] [blame] | 213 | struct ipc_namespace *ipc_ns, umode_t mode, |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 214 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 216 | struct user_struct *u = current_user(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | struct inode *inode; |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 218 | int ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | inode = new_inode(sb); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 221 | if (!inode) |
| 222 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 224 | inode->i_ino = get_next_ino(); |
| 225 | inode->i_mode = mode; |
| 226 | inode->i_uid = current_fsuid(); |
| 227 | inode->i_gid = current_fsgid(); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 228 | inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 230 | if (S_ISREG(mode)) { |
| 231 | struct mqueue_inode_info *info; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 232 | unsigned long mq_bytes, mq_treesize; |
André Goddard Rosa | c8308b1 | 2010-02-23 04:04:23 -0300 | [diff] [blame] | 233 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 234 | inode->i_fop = &mqueue_file_operations; |
| 235 | inode->i_size = FILENT_SIZE; |
| 236 | /* mqueue specific info */ |
| 237 | info = MQUEUE_I(inode); |
| 238 | spin_lock_init(&info->lock); |
| 239 | init_waitqueue_head(&info->wait_q); |
| 240 | INIT_LIST_HEAD(&info->e_wait_q[0].list); |
| 241 | INIT_LIST_HEAD(&info->e_wait_q[1].list); |
| 242 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 243 | info->notify_user_ns = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 244 | info->qsize = 0; |
| 245 | info->user = NULL; /* set when all is ok */ |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 246 | info->msg_tree = RB_ROOT; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 247 | info->node_cache = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 248 | memset(&info->attr, 0, sizeof(info->attr)); |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 249 | info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, |
| 250 | ipc_ns->mq_msg_default); |
| 251 | info->attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, |
| 252 | ipc_ns->mq_msgsize_default); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 253 | if (attr) { |
| 254 | info->attr.mq_maxmsg = attr->mq_maxmsg; |
| 255 | info->attr.mq_msgsize = attr->mq_msgsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 257 | /* |
| 258 | * We used to allocate a static array of pointers and account |
| 259 | * the size of that array as well as one msg_msg struct per |
| 260 | * possible message into the queue size. That's no longer |
| 261 | * accurate as the queue is now an rbtree and will grow and |
| 262 | * shrink depending on usage patterns. We can, however, still |
| 263 | * account one msg_msg struct per message, but the nodes are |
| 264 | * allocated depending on priority usage, and most programs |
| 265 | * only use one, or a handful, of priorities. However, since |
| 266 | * this is pinned memory, we need to assume worst case, so |
| 267 | * that means the min(mq_maxmsg, max_priorities) * struct |
| 268 | * posix_msg_tree_node. |
| 269 | */ |
| 270 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 271 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 272 | sizeof(struct posix_msg_tree_node); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 273 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 274 | mq_bytes = mq_treesize + (info->attr.mq_maxmsg * |
| 275 | info->attr.mq_msgsize); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 276 | |
| 277 | spin_lock(&mq_lock); |
| 278 | if (u->mq_bytes + mq_bytes < u->mq_bytes || |
Davidlohr Bueso | 2a4e64b | 2012-01-20 14:34:01 -0800 | [diff] [blame] | 279 | u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) { |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 280 | spin_unlock(&mq_lock); |
| 281 | /* mqueue_evict_inode() releases info->messages */ |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 282 | ret = -EMFILE; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 283 | goto out_inode; |
| 284 | } |
| 285 | u->mq_bytes += mq_bytes; |
| 286 | spin_unlock(&mq_lock); |
| 287 | |
| 288 | /* all is ok */ |
| 289 | info->user = get_uid(u); |
| 290 | } else if (S_ISDIR(mode)) { |
| 291 | inc_nlink(inode); |
| 292 | /* Some things misbehave if size == 0 on a directory */ |
| 293 | inode->i_size = 2 * DIRENT_SIZE; |
| 294 | inode->i_op = &mqueue_dir_inode_operations; |
| 295 | inode->i_fop = &simple_dir_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | return inode; |
| 299 | out_inode: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | iput(inode); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 301 | err: |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 302 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | static int mqueue_fill_super(struct super_block *sb, void *data, int silent) |
| 306 | { |
| 307 | struct inode *inode; |
Eric W. Biederman | d91ee87 | 2016-05-23 14:51:59 -0500 | [diff] [blame] | 308 | struct ipc_namespace *ns = sb->s_fs_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Eric W. Biederman | a2982cc | 2016-06-09 15:34:02 -0500 | [diff] [blame] | 310 | sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 311 | sb->s_blocksize = PAGE_SIZE; |
| 312 | sb->s_blocksize_bits = PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | sb->s_magic = MQUEUE_MAGIC; |
| 314 | sb->s_op = &mqueue_super_ops; |
| 315 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 316 | inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); |
| 317 | if (IS_ERR(inode)) |
| 318 | return PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 320 | sb->s_root = d_make_root(inode); |
| 321 | if (!sb->s_root) |
| 322 | return -ENOMEM; |
| 323 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 326 | static struct dentry *mqueue_mount(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 327 | int flags, const char *dev_name, |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 328 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
Eric W. Biederman | d91ee87 | 2016-05-23 14:51:59 -0500 | [diff] [blame] | 330 | struct ipc_namespace *ns; |
| 331 | if (flags & MS_KERNMOUNT) { |
| 332 | ns = data; |
| 333 | data = NULL; |
| 334 | } else { |
| 335 | ns = current->nsproxy->ipc_ns; |
Eric W. Biederman | a636b70 | 2013-03-21 18:13:15 -0700 | [diff] [blame] | 336 | } |
Eric W. Biederman | d91ee87 | 2016-05-23 14:51:59 -0500 | [diff] [blame] | 337 | return mount_ns(fs_type, flags, data, ns, ns->user_ns, mqueue_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 340 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | { |
| 342 | struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo; |
| 343 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 344 | inode_init_once(&p->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | static struct inode *mqueue_alloc_inode(struct super_block *sb) |
| 348 | { |
| 349 | struct mqueue_inode_info *ei; |
| 350 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 351 | ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | if (!ei) |
| 353 | return NULL; |
| 354 | return &ei->vfs_inode; |
| 355 | } |
| 356 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 357 | static void mqueue_i_callback(struct rcu_head *head) |
| 358 | { |
| 359 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 360 | kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode)); |
| 361 | } |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | static void mqueue_destroy_inode(struct inode *inode) |
| 364 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 365 | call_rcu(&inode->i_rcu, mqueue_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 368 | static void mqueue_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
| 370 | struct mqueue_inode_info *info; |
| 371 | struct user_struct *user; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 372 | struct ipc_namespace *ipc_ns; |
Li Rongqing | 7b5598c | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 373 | struct msg_msg *msg, *nmsg; |
| 374 | LIST_HEAD(tmp_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 376 | clear_inode(inode); |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 377 | |
| 378 | if (S_ISDIR(inode->i_mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return; |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 380 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 381 | ipc_ns = get_ns_from_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | info = MQUEUE_I(inode); |
| 383 | spin_lock(&info->lock); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 384 | while ((msg = msg_get(info)) != NULL) |
Li Rongqing | 7b5598c | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 385 | list_add_tail(&msg->m_list, &tmp_msg); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 386 | kfree(info->node_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | spin_unlock(&info->lock); |
| 388 | |
Li Rongqing | 7b5598c | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 389 | list_for_each_entry_safe(msg, nmsg, &tmp_msg, m_list) { |
| 390 | list_del(&msg->m_list); |
| 391 | free_msg(msg); |
| 392 | } |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | user = info->user; |
| 395 | if (user) { |
Kees Cook | 62369d5 | 2019-07-16 16:30:21 -0700 | [diff] [blame] | 396 | unsigned long mq_bytes, mq_treesize; |
| 397 | |
| 398 | /* Total amount of bytes accounted for the mqueue */ |
| 399 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 400 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 401 | sizeof(struct posix_msg_tree_node); |
| 402 | |
| 403 | mq_bytes = mq_treesize + (info->attr.mq_maxmsg * |
| 404 | info->attr.mq_msgsize); |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | spin_lock(&mq_lock); |
| 407 | user->mq_bytes -= mq_bytes; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 408 | /* |
| 409 | * get_ns_from_inode() ensures that the |
| 410 | * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns |
| 411 | * to which we now hold a reference, or it is NULL. |
| 412 | * We can't put it here under mq_lock, though. |
| 413 | */ |
| 414 | if (ipc_ns) |
| 415 | ipc_ns->mq_queues_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | spin_unlock(&mq_lock); |
| 417 | free_uid(user); |
| 418 | } |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 419 | if (ipc_ns) |
| 420 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | static int mqueue_create(struct inode *dir, struct dentry *dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 424 | umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | { |
| 426 | struct inode *inode; |
| 427 | struct mq_attr *attr = dentry->d_fsdata; |
| 428 | int error; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 429 | struct ipc_namespace *ipc_ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | spin_lock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 432 | ipc_ns = __get_ns_from_inode(dir); |
| 433 | if (!ipc_ns) { |
| 434 | error = -EACCES; |
| 435 | goto out_unlock; |
| 436 | } |
Davidlohr Bueso | f3713fd | 2014-02-25 15:01:45 -0800 | [diff] [blame] | 437 | |
| 438 | if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max && |
| 439 | !capable(CAP_SYS_RESOURCE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | error = -ENOSPC; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 441 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 443 | ipc_ns->mq_queues_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | spin_unlock(&mq_lock); |
| 445 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 446 | inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 447 | if (IS_ERR(inode)) { |
| 448 | error = PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | spin_lock(&mq_lock); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 450 | ipc_ns->mq_queues_count--; |
| 451 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 454 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | dir->i_size += DIRENT_SIZE; |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 456 | dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | d_instantiate(dentry, inode); |
| 459 | dget(dentry); |
| 460 | return 0; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 461 | out_unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | spin_unlock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 463 | if (ipc_ns) |
| 464 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return error; |
| 466 | } |
| 467 | |
| 468 | static int mqueue_unlink(struct inode *dir, struct dentry *dentry) |
| 469 | { |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 470 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 472 | dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | dir->i_size -= DIRENT_SIZE; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 474 | drop_nlink(inode); |
| 475 | dput(dentry); |
| 476 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /* |
| 480 | * This is routine for system read from queue file. |
| 481 | * To avoid mess with doing here some sort of mq_receive we allow |
| 482 | * to read only queue size & notification info (the only values |
| 483 | * that are interesting from user point of view and aren't accessible |
| 484 | * through std routines) |
| 485 | */ |
| 486 | 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] | 487 | size_t count, loff_t *off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 489 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | char buffer[FILENT_SIZE]; |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 491 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
| 493 | spin_lock(&info->lock); |
| 494 | snprintf(buffer, sizeof(buffer), |
| 495 | "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d\n", |
| 496 | info->qsize, |
| 497 | info->notify_owner ? info->notify.sigev_notify : 0, |
| 498 | (info->notify_owner && |
| 499 | info->notify.sigev_notify == SIGEV_SIGNAL) ? |
| 500 | info->notify.sigev_signo : 0, |
Pavel Emelyanov | 6c5f3e7 | 2008-02-08 04:19:20 -0800 | [diff] [blame] | 501 | pid_vnr(info->notify_owner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | spin_unlock(&info->lock); |
| 503 | buffer[sizeof(buffer)-1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 505 | ret = simple_read_from_buffer(u_data, count, off, buffer, |
| 506 | strlen(buffer)); |
| 507 | if (ret <= 0) |
| 508 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 510 | file_inode(filp)->i_atime = file_inode(filp)->i_ctime = current_time(file_inode(filp)); |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 511 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
| 513 | |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 514 | static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 516 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | spin_lock(&info->lock); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 519 | if (task_tgid(current) == info->notify_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | remove_notification(info); |
| 521 | |
| 522 | spin_unlock(&info->lock); |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) |
| 527 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 528 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | int retval = 0; |
| 530 | |
| 531 | poll_wait(filp, &info->wait_q, poll_tab); |
| 532 | |
| 533 | spin_lock(&info->lock); |
| 534 | if (info->attr.mq_curmsgs) |
| 535 | retval = POLLIN | POLLRDNORM; |
| 536 | |
| 537 | if (info->attr.mq_curmsgs < info->attr.mq_maxmsg) |
| 538 | retval |= POLLOUT | POLLWRNORM; |
| 539 | spin_unlock(&info->lock); |
| 540 | |
| 541 | return retval; |
| 542 | } |
| 543 | |
| 544 | /* Adds current to info->e_wait_q[sr] before element with smaller prio */ |
| 545 | static void wq_add(struct mqueue_inode_info *info, int sr, |
| 546 | struct ext_wait_queue *ewp) |
| 547 | { |
| 548 | struct ext_wait_queue *walk; |
| 549 | |
| 550 | ewp->task = current; |
| 551 | |
| 552 | list_for_each_entry(walk, &info->e_wait_q[sr].list, list) { |
| 553 | if (walk->task->static_prio <= current->static_prio) { |
| 554 | list_add_tail(&ewp->list, &walk->list); |
| 555 | return; |
| 556 | } |
| 557 | } |
| 558 | list_add_tail(&ewp->list, &info->e_wait_q[sr].list); |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * Puts current task to sleep. Caller must hold queue lock. After return |
| 563 | * lock isn't held. |
| 564 | * sr: SEND or RECV |
| 565 | */ |
| 566 | static int wq_sleep(struct mqueue_inode_info *info, int sr, |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 567 | ktime_t *timeout, struct ext_wait_queue *ewp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
| 569 | int retval; |
| 570 | signed long time; |
| 571 | |
| 572 | wq_add(info, sr, ewp); |
| 573 | |
| 574 | for (;;) { |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 575 | __set_current_state(TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | spin_unlock(&info->lock); |
Wanlong Gao | 32ea845 | 2011-10-31 17:06:35 -0700 | [diff] [blame] | 578 | time = schedule_hrtimeout_range_clock(timeout, 0, |
| 579 | HRTIMER_MODE_ABS, CLOCK_REALTIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | if (ewp->state == STATE_READY) { |
| 582 | retval = 0; |
| 583 | goto out; |
| 584 | } |
| 585 | spin_lock(&info->lock); |
| 586 | if (ewp->state == STATE_READY) { |
| 587 | retval = 0; |
| 588 | goto out_unlock; |
| 589 | } |
| 590 | if (signal_pending(current)) { |
| 591 | retval = -ERESTARTSYS; |
| 592 | break; |
| 593 | } |
| 594 | if (time == 0) { |
| 595 | retval = -ETIMEDOUT; |
| 596 | break; |
| 597 | } |
| 598 | } |
| 599 | list_del(&ewp->list); |
| 600 | out_unlock: |
| 601 | spin_unlock(&info->lock); |
| 602 | out: |
| 603 | return retval; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * Returns waiting task that should be serviced first or NULL if none exists |
| 608 | */ |
| 609 | static struct ext_wait_queue *wq_get_first_waiter( |
| 610 | struct mqueue_inode_info *info, int sr) |
| 611 | { |
| 612 | struct list_head *ptr; |
| 613 | |
| 614 | ptr = info->e_wait_q[sr].list.prev; |
| 615 | if (ptr == &info->e_wait_q[sr].list) |
| 616 | return NULL; |
| 617 | return list_entry(ptr, struct ext_wait_queue, list); |
| 618 | } |
| 619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
| 621 | static inline void set_cookie(struct sk_buff *skb, char code) |
| 622 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 623 | ((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | /* |
| 627 | * The next function is only to split too long sys_mq_timedsend |
| 628 | */ |
| 629 | static void __do_notify(struct mqueue_inode_info *info) |
| 630 | { |
| 631 | /* notification |
| 632 | * invoked when there is registered process and there isn't process |
| 633 | * waiting synchronously for message AND state of queue changed from |
| 634 | * empty to not empty. Here we are sure that no one is waiting |
| 635 | * synchronously. */ |
| 636 | if (info->notify_owner && |
| 637 | info->attr.mq_curmsgs == 1) { |
| 638 | struct siginfo sig_i; |
| 639 | switch (info->notify.sigev_notify) { |
| 640 | case SIGEV_NONE: |
| 641 | break; |
| 642 | case SIGEV_SIGNAL: |
| 643 | /* sends signal */ |
| 644 | |
| 645 | sig_i.si_signo = info->notify.sigev_signo; |
| 646 | sig_i.si_errno = 0; |
| 647 | sig_i.si_code = SI_MESGQ; |
| 648 | sig_i.si_value = info->notify.sigev_value; |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 649 | /* map current pid/uid into info->owner's namespaces */ |
| 650 | rcu_read_lock(); |
Sukadev Bhattiprolu | a668499 | 2009-01-07 18:08:50 -0800 | [diff] [blame] | 651 | sig_i.si_pid = task_tgid_nr_ns(current, |
| 652 | ns_of_pid(info->notify_owner)); |
Eric W. Biederman | 76b6db0 | 2012-03-14 15:24:19 -0700 | [diff] [blame] | 653 | 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] | 654 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 656 | kill_pid_info(info->notify.sigev_signo, |
| 657 | &sig_i, info->notify_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | break; |
| 659 | case SIGEV_THREAD: |
| 660 | set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 661 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | break; |
| 663 | } |
| 664 | /* after notification unregisters process */ |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 665 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 666 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 667 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 668 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | wake_up(&info->wait_q); |
| 671 | } |
| 672 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 673 | static int prepare_timeout(const struct timespec __user *u_abs_timeout, |
| 674 | ktime_t *expires, struct timespec *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 676 | if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec))) |
| 677 | return -EFAULT; |
| 678 | if (!timespec_valid(ts)) |
| 679 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 681 | *expires = timespec_to_ktime(*ts); |
| 682 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
| 685 | static void remove_notification(struct mqueue_inode_info *info) |
| 686 | { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 687 | if (info->notify_owner != NULL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | info->notify.sigev_notify == SIGEV_THREAD) { |
| 689 | set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 690 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 692 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 693 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 694 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 695 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
| 697 | |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 698 | 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] | 699 | { |
Doug Ledford | 2c12ea4 | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 700 | int mq_treesize; |
| 701 | unsigned long total_size; |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 704 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (capable(CAP_SYS_RESOURCE)) { |
Doug Ledford | 02967ea | 2012-05-31 16:26:29 -0700 | [diff] [blame] | 706 | if (attr->mq_maxmsg > HARD_MSGMAX || |
| 707 | attr->mq_msgsize > HARD_MSGSIZEMAX) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 708 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } else { |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 710 | if (attr->mq_maxmsg > ipc_ns->mq_msg_max || |
| 711 | attr->mq_msgsize > ipc_ns->mq_msgsize_max) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 712 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
| 714 | /* check for overflow */ |
| 715 | if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 716 | return -EOVERFLOW; |
Doug Ledford | 2c12ea4 | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 717 | mq_treesize = attr->mq_maxmsg * sizeof(struct msg_msg) + |
| 718 | min_t(unsigned int, attr->mq_maxmsg, MQ_PRIO_MAX) * |
| 719 | sizeof(struct posix_msg_tree_node); |
| 720 | total_size = attr->mq_maxmsg * attr->mq_msgsize; |
| 721 | if (total_size + mq_treesize < total_size) |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 722 | return -EOVERFLOW; |
| 723 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Invoked when creating a new queue via sys_mq_open |
| 728 | */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 729 | static struct file *do_create(struct ipc_namespace *ipc_ns, struct inode *dir, |
| 730 | struct path *path, int oflag, umode_t mode, |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 731 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 733 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | int ret; |
| 735 | |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 736 | if (attr) { |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 737 | ret = mq_attr_ok(ipc_ns, attr); |
| 738 | if (ret) |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 739 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | /* store for use during create */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 741 | path->dentry->d_fsdata = attr; |
Doug Ledford | 113289c | 2012-05-31 16:26:36 -0700 | [diff] [blame] | 742 | } else { |
| 743 | struct mq_attr def_attr; |
| 744 | |
| 745 | def_attr.mq_maxmsg = min(ipc_ns->mq_msg_max, |
| 746 | ipc_ns->mq_msg_default); |
| 747 | def_attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, |
| 748 | ipc_ns->mq_msgsize_default); |
| 749 | ret = mq_attr_ok(ipc_ns, &def_attr); |
| 750 | if (ret) |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 751 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 754 | mode &= ~current_umask(); |
Daniel Rosenberg | bbcd0ff | 2016-10-26 16:27:45 -0700 | [diff] [blame] | 755 | ret = vfs_create2(path->mnt, dir, path->dentry, mode, true); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 756 | path->dentry->d_fsdata = NULL; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 757 | if (ret) |
| 758 | return ERR_PTR(ret); |
| 759 | return dentry_open(path, oflag, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | /* Opens existing queue */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 763 | static struct file *do_open(struct path *path, int oflag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 765 | static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, |
| 766 | MAY_READ | MAY_WRITE }; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 767 | int acc; |
| 768 | if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) |
| 769 | return ERR_PTR(-EINVAL); |
| 770 | acc = oflag2acc[oflag & O_ACCMODE]; |
Daniel Rosenberg | bbcd0ff | 2016-10-26 16:27:45 -0700 | [diff] [blame] | 771 | if (inode_permission2(path->mnt, d_inode(path->dentry), acc)) |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 772 | return ERR_PTR(-EACCES); |
| 773 | return dentry_open(path, oflag, current_cred()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Al Viro | df0a428 | 2011-07-26 05:26:10 -0400 | [diff] [blame] | 776 | 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] | 777 | struct mq_attr __user *, u_attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | { |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 779 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | struct file *filp; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 781 | struct filename *name; |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 782 | struct mq_attr attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | int fd, error; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 784 | struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 785 | struct vfsmount *mnt = ipc_ns->mq_mnt; |
| 786 | struct dentry *root = mnt->mnt_root; |
| 787 | int ro; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 789 | if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) |
| 790 | return -EFAULT; |
| 791 | |
| 792 | audit_mq_open(oflag, mode, u_attr ? &attr : NULL); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | if (IS_ERR(name = getname(u_name))) |
| 795 | return PTR_ERR(name); |
| 796 | |
Ulrich Drepper | 269f213 | 2008-05-03 15:28:45 -0400 | [diff] [blame] | 797 | fd = get_unused_fd_flags(O_CLOEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | if (fd < 0) |
| 799 | goto out_putname; |
| 800 | |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 801 | ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 802 | error = 0; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 803 | inode_lock(d_inode(root)); |
Daniel Rosenberg | bbcd0ff | 2016-10-26 16:27:45 -0700 | [diff] [blame] | 804 | path.dentry = lookup_one_len2(name->name, mnt, root, strlen(name->name)); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 805 | if (IS_ERR(path.dentry)) { |
| 806 | error = PTR_ERR(path.dentry); |
André Goddard Rosa | 4294a8e | 2010-02-23 04:04:28 -0300 | [diff] [blame] | 807 | goto out_putfd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | } |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 809 | path.mnt = mntget(mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | if (oflag & O_CREAT) { |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 812 | if (d_really_is_positive(path.dentry)) { /* entry already exists */ |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 813 | audit_inode(name, path.dentry, 0); |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 814 | if (oflag & O_EXCL) { |
| 815 | error = -EEXIST; |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 816 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 817 | } |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 818 | filp = do_open(&path, oflag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | } else { |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 820 | if (ro) { |
| 821 | error = ro; |
| 822 | goto out; |
| 823 | } |
Jeff Layton | 79f6530 | 2013-07-08 15:59:36 -0700 | [diff] [blame] | 824 | audit_inode_parent_hidden(name, root); |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 825 | filp = do_create(ipc_ns, d_inode(root), |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 826 | &path, oflag, mode, |
Al Viro | 564f699 | 2008-12-14 04:02:26 -0500 | [diff] [blame] | 827 | u_attr ? &attr : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 829 | } else { |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 830 | if (d_really_is_negative(path.dentry)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 831 | error = -ENOENT; |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 832 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 833 | } |
Jeff Layton | adb5c24 | 2012-10-10 16:43:13 -0400 | [diff] [blame] | 834 | audit_inode(name, path.dentry, 0); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 835 | filp = do_open(&path, oflag); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 836 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 838 | if (!IS_ERR(filp)) |
| 839 | fd_install(fd, filp); |
| 840 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | error = PTR_ERR(filp); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 842 | out: |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 843 | path_put(&path); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 844 | out_putfd: |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 845 | if (error) { |
| 846 | put_unused_fd(fd); |
| 847 | fd = error; |
| 848 | } |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 849 | inode_unlock(d_inode(root)); |
Vladimir Davydov | 38d78e5 | 2013-03-22 15:04:51 -0700 | [diff] [blame] | 850 | if (!ro) |
| 851 | mnt_drop_write(mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | out_putname: |
| 853 | putname(name); |
| 854 | return fd; |
| 855 | } |
| 856 | |
Heiko Carstens | d5460c9 | 2009-01-14 14:14:27 +0100 | [diff] [blame] | 857 | SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
| 859 | int err; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 860 | struct filename *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | struct dentry *dentry; |
| 862 | struct inode *inode = NULL; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 863 | struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 864 | struct vfsmount *mnt = ipc_ns->mq_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
| 866 | name = getname(u_name); |
| 867 | if (IS_ERR(name)) |
| 868 | return PTR_ERR(name); |
| 869 | |
Jeff Layton | 79f6530 | 2013-07-08 15:59:36 -0700 | [diff] [blame] | 870 | audit_inode_parent_hidden(name, mnt->mnt_root); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 871 | err = mnt_want_write(mnt); |
| 872 | if (err) |
| 873 | goto out_name; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 874 | inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
Daniel Rosenberg | bbcd0ff | 2016-10-26 16:27:45 -0700 | [diff] [blame] | 875 | dentry = lookup_one_len2(name->name, mnt, mnt->mnt_root, |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 876 | strlen(name->name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | if (IS_ERR(dentry)) { |
| 878 | err = PTR_ERR(dentry); |
| 879 | goto out_unlock; |
| 880 | } |
| 881 | |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 882 | inode = d_inode(dentry); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 883 | if (!inode) { |
| 884 | err = -ENOENT; |
| 885 | } else { |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 886 | ihold(inode); |
Daniel Rosenberg | bbcd0ff | 2016-10-26 16:27:45 -0700 | [diff] [blame] | 887 | err = vfs_unlink2(mnt, d_inode(dentry->d_parent), dentry, NULL); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 888 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | dput(dentry); |
| 890 | |
| 891 | out_unlock: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 892 | inode_unlock(d_inode(mnt->mnt_root)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | if (inode) |
| 894 | iput(inode); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 895 | mnt_drop_write(mnt); |
| 896 | out_name: |
| 897 | putname(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
| 899 | return err; |
| 900 | } |
| 901 | |
| 902 | /* Pipelined send and receive functions. |
| 903 | * |
| 904 | * If a receiver finds no waiting message, then it registers itself in the |
| 905 | * list of waiting receivers. A sender checks that list before adding the new |
| 906 | * message into the message array. If there is a waiting receiver, then it |
| 907 | * bypasses the message array and directly hands the message over to the |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 908 | * receiver. The receiver accepts the message and returns without grabbing the |
| 909 | * queue spinlock: |
| 910 | * |
| 911 | * - Set pointer to message. |
| 912 | * - Queue the receiver task for later wakeup (without the info->lock). |
| 913 | * - Update its state to STATE_READY. Now the receiver can continue. |
| 914 | * - Wake up the process after the lock is dropped. Should the process wake up |
| 915 | * before this wakeup (due to a timeout or a signal) it will either see |
| 916 | * STATE_READY and continue or acquire the lock to check the state again. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | * |
| 918 | * The same algorithm is used for senders. |
| 919 | */ |
| 920 | |
| 921 | /* pipelined_send() - send a message directly to the task waiting in |
| 922 | * sys_mq_timedreceive() (without inserting message into a queue). |
| 923 | */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 924 | static inline void pipelined_send(struct wake_q_head *wake_q, |
| 925 | struct mqueue_inode_info *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | struct msg_msg *message, |
| 927 | struct ext_wait_queue *receiver) |
| 928 | { |
| 929 | receiver->msg = message; |
| 930 | list_del(&receiver->list); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 931 | wake_q_add(wake_q, receiver->task); |
| 932 | /* |
| 933 | * Rely on the implicit cmpxchg barrier from wake_q_add such |
| 934 | * that we can ensure that updating receiver->state is the last |
| 935 | * write operation: As once set, the receiver can continue, |
| 936 | * and if we don't have the reference count from the wake_q, |
| 937 | * yet, at that point we can later have a use-after-free |
| 938 | * condition and bogus wakeup. |
| 939 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | receiver->state = STATE_READY; |
| 941 | } |
| 942 | |
| 943 | /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() |
| 944 | * gets its message and put to the queue (we have one free place for sure). */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 945 | static inline void pipelined_receive(struct wake_q_head *wake_q, |
| 946 | struct mqueue_inode_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
| 948 | struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND); |
| 949 | |
| 950 | if (!sender) { |
| 951 | /* for poll */ |
| 952 | wake_up_interruptible(&info->wait_q); |
| 953 | return; |
| 954 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 955 | if (msg_insert(sender->msg, info)) |
| 956 | return; |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | list_del(&sender->list); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 959 | wake_q_add(wake_q, sender->task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | sender->state = STATE_READY; |
| 961 | } |
| 962 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 963 | SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, |
| 964 | size_t, msg_len, unsigned int, msg_prio, |
| 965 | const struct timespec __user *, u_abs_timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 967 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | struct inode *inode; |
| 969 | struct ext_wait_queue wait; |
| 970 | struct ext_wait_queue *receiver; |
| 971 | struct msg_msg *msg_ptr; |
| 972 | struct mqueue_inode_info *info; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 973 | ktime_t expires, *timeout = NULL; |
| 974 | struct timespec ts; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 975 | struct posix_msg_tree_node *new_leaf = NULL; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 976 | int ret = 0; |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 977 | WAKE_Q(wake_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 979 | if (u_abs_timeout) { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 980 | int res = prepare_timeout(u_abs_timeout, &expires, &ts); |
| 981 | if (res) |
| 982 | return res; |
| 983 | timeout = &expires; |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 984 | } |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 985 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) |
| 987 | return -EINVAL; |
| 988 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 989 | audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 991 | f = fdget(mqdes); |
| 992 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 993 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 995 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 997 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 998 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 999 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1001 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | info = MQUEUE_I(inode); |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 1003 | audit_file(f.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1005 | if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1006 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1008 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | if (unlikely(msg_len > info->attr.mq_msgsize)) { |
| 1011 | ret = -EMSGSIZE; |
| 1012 | goto out_fput; |
| 1013 | } |
| 1014 | |
| 1015 | /* First try to allocate memory, before doing anything with |
| 1016 | * existing queues. */ |
| 1017 | msg_ptr = load_msg(u_msg_ptr, msg_len); |
| 1018 | if (IS_ERR(msg_ptr)) { |
| 1019 | ret = PTR_ERR(msg_ptr); |
| 1020 | goto out_fput; |
| 1021 | } |
| 1022 | msg_ptr->m_ts = msg_len; |
| 1023 | msg_ptr->m_type = msg_prio; |
| 1024 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1025 | /* |
| 1026 | * msg_insert really wants us to have a valid, spare node struct so |
| 1027 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1028 | * fall back to that if necessary. |
| 1029 | */ |
| 1030 | if (!info->node_cache) |
| 1031 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | spin_lock(&info->lock); |
| 1034 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1035 | if (!info->node_cache && new_leaf) { |
| 1036 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1037 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1038 | info->node_cache = new_leaf; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1039 | new_leaf = NULL; |
| 1040 | } else { |
| 1041 | kfree(new_leaf); |
| 1042 | } |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1045 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | } else { |
| 1048 | wait.task = current; |
| 1049 | wait.msg = (void *) msg_ptr; |
| 1050 | wait.state = STATE_NONE; |
| 1051 | ret = wq_sleep(info, SEND, timeout, &wait); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1052 | /* |
| 1053 | * wq_sleep must be called with info->lock held, and |
| 1054 | * returns with the lock released |
| 1055 | */ |
| 1056 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | } else { |
| 1059 | receiver = wq_get_first_waiter(info, RECV); |
| 1060 | if (receiver) { |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1061 | pipelined_send(&wake_q, info, msg_ptr, receiver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } else { |
| 1063 | /* adds message to the queue */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1064 | ret = msg_insert(msg_ptr, info); |
| 1065 | if (ret) |
| 1066 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | __do_notify(info); |
| 1068 | } |
| 1069 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1070 | current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1072 | out_unlock: |
| 1073 | spin_unlock(&info->lock); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1074 | wake_up_q(&wake_q); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1075 | out_free: |
| 1076 | if (ret) |
| 1077 | free_msg(msg_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1079 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | out: |
| 1081 | return ret; |
| 1082 | } |
| 1083 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1084 | SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, |
| 1085 | size_t, msg_len, unsigned int __user *, u_msg_prio, |
| 1086 | const struct timespec __user *, u_abs_timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | ssize_t ret; |
| 1089 | struct msg_msg *msg_ptr; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1090 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | struct inode *inode; |
| 1092 | struct mqueue_inode_info *info; |
| 1093 | struct ext_wait_queue wait; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1094 | ktime_t expires, *timeout = NULL; |
| 1095 | struct timespec ts; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1096 | struct posix_msg_tree_node *new_leaf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 1098 | if (u_abs_timeout) { |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1099 | int res = prepare_timeout(u_abs_timeout, &expires, &ts); |
| 1100 | if (res) |
| 1101 | return res; |
| 1102 | timeout = &expires; |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 1103 | } |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1104 | |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1105 | audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1107 | f = fdget(mqdes); |
| 1108 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1109 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1113 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1114 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1115 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | info = MQUEUE_I(inode); |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 1119 | audit_file(f.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1121 | if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1122 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
| 1126 | /* checks if buffer is big enough */ |
| 1127 | if (unlikely(msg_len < info->attr.mq_msgsize)) { |
| 1128 | ret = -EMSGSIZE; |
| 1129 | goto out_fput; |
| 1130 | } |
| 1131 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1132 | /* |
| 1133 | * msg_insert really wants us to have a valid, spare node struct so |
| 1134 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1135 | * fall back to that if necessary. |
| 1136 | */ |
| 1137 | if (!info->node_cache) |
| 1138 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | spin_lock(&info->lock); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1141 | |
| 1142 | if (!info->node_cache && new_leaf) { |
| 1143 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1144 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1145 | info->node_cache = new_leaf; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1146 | } else { |
| 1147 | kfree(new_leaf); |
| 1148 | } |
| 1149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | if (info->attr.mq_curmsgs == 0) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1151 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | spin_unlock(&info->lock); |
| 1153 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } else { |
| 1155 | wait.task = current; |
| 1156 | wait.state = STATE_NONE; |
| 1157 | ret = wq_sleep(info, RECV, timeout, &wait); |
| 1158 | msg_ptr = wait.msg; |
| 1159 | } |
| 1160 | } else { |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1161 | WAKE_Q(wake_q); |
| 1162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | msg_ptr = msg_get(info); |
| 1164 | |
| 1165 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1166 | current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | |
| 1168 | /* There is now free space in queue. */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1169 | pipelined_receive(&wake_q, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | spin_unlock(&info->lock); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1171 | wake_up_q(&wake_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | ret = 0; |
| 1173 | } |
| 1174 | if (ret == 0) { |
| 1175 | ret = msg_ptr->m_ts; |
| 1176 | |
| 1177 | if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) || |
| 1178 | store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) { |
| 1179 | ret = -EFAULT; |
| 1180 | } |
| 1181 | free_msg(msg_ptr); |
| 1182 | } |
| 1183 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1184 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | out: |
| 1186 | return ret; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * Notes: the case when user wants us to deregister (with NULL as pointer) |
| 1191 | * and he isn't currently owner of notification, will be silently discarded. |
| 1192 | * It isn't explicitly defined in the POSIX. |
| 1193 | */ |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1194 | SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
| 1195 | const struct sigevent __user *, u_notification) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1197 | int ret; |
| 1198 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | struct sock *sock; |
| 1200 | struct inode *inode; |
| 1201 | struct sigevent notification; |
| 1202 | struct mqueue_inode_info *info; |
| 1203 | struct sk_buff *nc; |
| 1204 | |
Al Viro | 20114f7 | 2008-12-10 07:16:12 -0500 | [diff] [blame] | 1205 | if (u_notification) { |
| 1206 | if (copy_from_user(¬ification, u_notification, |
| 1207 | sizeof(struct sigevent))) |
| 1208 | return -EFAULT; |
| 1209 | } |
| 1210 | |
| 1211 | audit_mq_notify(mqdes, u_notification ? ¬ification : NULL); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | nc = NULL; |
| 1214 | sock = NULL; |
| 1215 | if (u_notification != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | if (unlikely(notification.sigev_notify != SIGEV_NONE && |
| 1217 | notification.sigev_notify != SIGEV_SIGNAL && |
| 1218 | notification.sigev_notify != SIGEV_THREAD)) |
| 1219 | return -EINVAL; |
| 1220 | if (notification.sigev_notify == SIGEV_SIGNAL && |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 1221 | !valid_signal(notification.sigev_signo)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | return -EINVAL; |
| 1223 | } |
| 1224 | if (notification.sigev_notify == SIGEV_THREAD) { |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1225 | long timeo; |
| 1226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | /* create the notify skb */ |
| 1228 | nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1229 | if (!nc) { |
| 1230 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | if (copy_from_user(nc->data, |
| 1234 | notification.sigev_value.sival_ptr, |
| 1235 | NOTIFY_COOKIE_LEN)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1236 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | goto out; |
| 1238 | } |
| 1239 | |
| 1240 | /* TODO: add a header? */ |
| 1241 | skb_put(nc, NOTIFY_COOKIE_LEN); |
| 1242 | /* and attach it to the socket */ |
| 1243 | retry: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1244 | f = fdget(notification.sigev_signo); |
| 1245 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1246 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1248 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1249 | sock = netlink_getsockbyfilp(f.file); |
| 1250 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | if (IS_ERR(sock)) { |
| 1252 | ret = PTR_ERR(sock); |
| 1253 | sock = NULL; |
| 1254 | goto out; |
| 1255 | } |
| 1256 | |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1257 | timeo = MAX_SCHEDULE_TIMEOUT; |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1258 | ret = netlink_attachskb(sock, nc, &timeo, NULL); |
Cong Wang | e695284 | 2017-07-09 13:19:55 -0700 | [diff] [blame] | 1259 | if (ret == 1) { |
| 1260 | sock = NULL; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1261 | goto retry; |
Cong Wang | e695284 | 2017-07-09 13:19:55 -0700 | [diff] [blame] | 1262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | if (ret) { |
| 1264 | sock = NULL; |
| 1265 | nc = NULL; |
| 1266 | goto out; |
| 1267 | } |
| 1268 | } |
| 1269 | } |
| 1270 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1271 | f = fdget(mqdes); |
| 1272 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1273 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1275 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1277 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1278 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1279 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | info = MQUEUE_I(inode); |
| 1283 | |
| 1284 | ret = 0; |
| 1285 | spin_lock(&info->lock); |
| 1286 | if (u_notification == NULL) { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1287 | if (info->notify_owner == task_tgid(current)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | remove_notification(info); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1289 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1291 | } else if (info->notify_owner != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | ret = -EBUSY; |
| 1293 | } else { |
| 1294 | switch (notification.sigev_notify) { |
| 1295 | case SIGEV_NONE: |
| 1296 | info->notify.sigev_notify = SIGEV_NONE; |
| 1297 | break; |
| 1298 | case SIGEV_THREAD: |
| 1299 | info->notify_sock = sock; |
| 1300 | info->notify_cookie = nc; |
| 1301 | sock = NULL; |
| 1302 | nc = NULL; |
| 1303 | info->notify.sigev_notify = SIGEV_THREAD; |
| 1304 | break; |
| 1305 | case SIGEV_SIGNAL: |
| 1306 | info->notify.sigev_signo = notification.sigev_signo; |
| 1307 | info->notify.sigev_value = notification.sigev_value; |
| 1308 | info->notify.sigev_notify = SIGEV_SIGNAL; |
| 1309 | break; |
| 1310 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1311 | |
| 1312 | info->notify_owner = get_pid(task_tgid(current)); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 1313 | info->notify_user_ns = get_user_ns(current_user_ns()); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1314 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | } |
| 1316 | spin_unlock(&info->lock); |
| 1317 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1318 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | out: |
Davidlohr Bueso | 3ab08fe | 2014-01-27 17:07:06 -0800 | [diff] [blame] | 1320 | if (sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | netlink_detachskb(sock, nc); |
Davidlohr Bueso | 3ab08fe | 2014-01-27 17:07:06 -0800 | [diff] [blame] | 1322 | else if (nc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | dev_kfree_skb(nc); |
Davidlohr Bueso | 3ab08fe | 2014-01-27 17:07:06 -0800 | [diff] [blame] | 1324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | return ret; |
| 1326 | } |
| 1327 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 1328 | SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
| 1329 | const struct mq_attr __user *, u_mqstat, |
| 1330 | struct mq_attr __user *, u_omqstat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | { |
| 1332 | int ret; |
| 1333 | struct mq_attr mqstat, omqstat; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1334 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | struct inode *inode; |
| 1336 | struct mqueue_inode_info *info; |
| 1337 | |
| 1338 | if (u_mqstat != NULL) { |
| 1339 | if (copy_from_user(&mqstat, u_mqstat, sizeof(struct mq_attr))) |
| 1340 | return -EFAULT; |
| 1341 | if (mqstat.mq_flags & (~O_NONBLOCK)) |
| 1342 | return -EINVAL; |
| 1343 | } |
| 1344 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1345 | f = fdget(mqdes); |
| 1346 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1347 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1349 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1351 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1352 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1353 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1355 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | info = MQUEUE_I(inode); |
| 1357 | |
| 1358 | spin_lock(&info->lock); |
| 1359 | |
| 1360 | omqstat = info->attr; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1361 | omqstat.mq_flags = f.file->f_flags & O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | if (u_mqstat) { |
Al Viro | 7392906 | 2008-12-10 06:58:59 -0500 | [diff] [blame] | 1363 | audit_mq_getsetattr(mqdes, &mqstat); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1364 | spin_lock(&f.file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | if (mqstat.mq_flags & O_NONBLOCK) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1366 | f.file->f_flags |= O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | else |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1368 | f.file->f_flags &= ~O_NONBLOCK; |
| 1369 | spin_unlock(&f.file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1371 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | } |
| 1373 | |
| 1374 | spin_unlock(&info->lock); |
| 1375 | |
| 1376 | ret = 0; |
| 1377 | if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat, |
| 1378 | sizeof(struct mq_attr))) |
| 1379 | ret = -EFAULT; |
| 1380 | |
| 1381 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1382 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | out: |
| 1384 | return ret; |
| 1385 | } |
| 1386 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 1387 | static const struct inode_operations mqueue_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | .lookup = simple_lookup, |
| 1389 | .create = mqueue_create, |
| 1390 | .unlink = mqueue_unlink, |
| 1391 | }; |
| 1392 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 1393 | static const struct file_operations mqueue_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | .flush = mqueue_flush_file, |
| 1395 | .poll = mqueue_poll_file, |
| 1396 | .read = mqueue_read_file, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1397 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | }; |
| 1399 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1400 | static const struct super_operations mqueue_super_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | .alloc_inode = mqueue_alloc_inode, |
| 1402 | .destroy_inode = mqueue_destroy_inode, |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 1403 | .evict_inode = mqueue_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | .statfs = simple_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | }; |
| 1406 | |
| 1407 | static struct file_system_type mqueue_fs_type = { |
| 1408 | .name = "mqueue", |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 1409 | .mount = mqueue_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | .kill_sb = kill_litter_super, |
Gao feng | bc1b69e | 2013-01-28 11:09:01 +0800 | [diff] [blame] | 1411 | .fs_flags = FS_USERNS_MOUNT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | }; |
| 1413 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1414 | int mq_init_ns(struct ipc_namespace *ns) |
| 1415 | { |
| 1416 | ns->mq_queues_count = 0; |
| 1417 | ns->mq_queues_max = DFLT_QUEUESMAX; |
| 1418 | ns->mq_msg_max = DFLT_MSGMAX; |
| 1419 | ns->mq_msgsize_max = DFLT_MSGSIZEMAX; |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 1420 | ns->mq_msg_default = DFLT_MSG; |
| 1421 | ns->mq_msgsize_default = DFLT_MSGSIZE; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1422 | |
| 1423 | ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns); |
| 1424 | if (IS_ERR(ns->mq_mnt)) { |
| 1425 | int err = PTR_ERR(ns->mq_mnt); |
| 1426 | ns->mq_mnt = NULL; |
| 1427 | return err; |
| 1428 | } |
| 1429 | return 0; |
| 1430 | } |
| 1431 | |
| 1432 | void mq_clear_sbinfo(struct ipc_namespace *ns) |
| 1433 | { |
| 1434 | ns->mq_mnt->mnt_sb->s_fs_info = NULL; |
| 1435 | } |
| 1436 | |
| 1437 | void mq_put_mnt(struct ipc_namespace *ns) |
| 1438 | { |
Al Viro | 6f68657 | 2011-12-09 00:38:50 -0500 | [diff] [blame] | 1439 | kern_unmount(ns->mq_mnt); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1440 | } |
| 1441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | static int __init init_mqueue_fs(void) |
| 1443 | { |
| 1444 | int error; |
| 1445 | |
| 1446 | mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache", |
| 1447 | sizeof(struct mqueue_inode_info), 0, |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 1448 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | if (mqueue_inode_cachep == NULL) |
| 1450 | return -ENOMEM; |
| 1451 | |
André Goddard Rosa | 2329e39 | 2010-02-23 04:04:27 -0300 | [diff] [blame] | 1452 | /* ignore failures - they are not fatal */ |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 1453 | mq_sysctl_table = mq_register_sysctl_table(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
| 1455 | error = register_filesystem(&mqueue_fs_type); |
| 1456 | if (error) |
| 1457 | goto out_sysctl; |
| 1458 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1459 | spin_lock_init(&mq_lock); |
| 1460 | |
Al Viro | 6f68657 | 2011-12-09 00:38:50 -0500 | [diff] [blame] | 1461 | error = mq_init_ns(&init_ipc_ns); |
| 1462 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | goto out_filesystem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | return 0; |
| 1466 | |
| 1467 | out_filesystem: |
| 1468 | unregister_filesystem(&mqueue_fs_type); |
| 1469 | out_sysctl: |
| 1470 | if (mq_sysctl_table) |
| 1471 | unregister_sysctl_table(mq_sysctl_table); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1472 | kmem_cache_destroy(mqueue_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | return error; |
| 1474 | } |
| 1475 | |
Davidlohr Bueso | 6d08a25 | 2014-04-07 15:39:18 -0700 | [diff] [blame] | 1476 | device_initcall(init_mqueue_fs); |