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> |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 21 | #include <linux/fs_context.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/namei.h> |
| 23 | #include <linux/sysctl.h> |
| 24 | #include <linux/poll.h> |
| 25 | #include <linux/mqueue.h> |
| 26 | #include <linux/msg.h> |
| 27 | #include <linux/skbuff.h> |
Doug Ledford | 5b5c4d1 | 2012-05-31 16:26:30 -0700 | [diff] [blame] | 28 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/netlink.h> |
| 30 | #include <linux/syscalls.h> |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 31 | #include <linux/audit.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 32 | #include <linux/signal.h> |
Ingo Molnar | 5f921ae | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 33 | #include <linux/mutex.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 34 | #include <linux/nsproxy.h> |
| 35 | #include <linux/pid.h> |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 36 | #include <linux/ipc_namespace.h> |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 37 | #include <linux/user_namespace.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Ingo Molnar | 84f001e | 2017-02-01 16:36:40 +0100 | [diff] [blame] | 39 | #include <linux/sched/wake_q.h> |
Ingo Molnar | 3f07c01 | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 40 | #include <linux/sched/signal.h> |
Ingo Molnar | 8703e8a | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 41 | #include <linux/sched/user.h> |
Ingo Molnar | 5f921ae | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <net/sock.h> |
| 44 | #include "util.h" |
| 45 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 46 | struct mqueue_fs_context { |
| 47 | struct ipc_namespace *ipc_ns; |
| 48 | }; |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #define MQUEUE_MAGIC 0x19800202 |
| 51 | #define DIRENT_SIZE 20 |
| 52 | #define FILENT_SIZE 80 |
| 53 | |
| 54 | #define SEND 0 |
| 55 | #define RECV 1 |
| 56 | |
| 57 | #define STATE_NONE 0 |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 58 | #define STATE_READY 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 60 | struct posix_msg_tree_node { |
| 61 | struct rb_node rb_node; |
| 62 | struct list_head msg_list; |
| 63 | int priority; |
| 64 | }; |
| 65 | |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 66 | /* |
| 67 | * Locking: |
| 68 | * |
| 69 | * Accesses to a message queue are synchronized by acquiring info->lock. |
| 70 | * |
| 71 | * There are two notable exceptions: |
| 72 | * - The actual wakeup of a sleeping task is performed using the wake_q |
| 73 | * framework. info->lock is already released when wake_up_q is called. |
| 74 | * - The exit codepaths after sleeping check ext_wait_queue->state without |
| 75 | * any locks. If it is STATE_READY, then the syscall is completed without |
| 76 | * acquiring info->lock. |
| 77 | * |
| 78 | * MQ_BARRIER: |
| 79 | * To achieve proper release/acquire memory barrier pairing, the state is set to |
| 80 | * STATE_READY with smp_store_release(), and it is read with READ_ONCE followed |
| 81 | * by smp_acquire__after_ctrl_dep(). In addition, wake_q_add_safe() is used. |
| 82 | * |
| 83 | * This prevents the following races: |
| 84 | * |
| 85 | * 1) With the simple wake_q_add(), the task could be gone already before |
| 86 | * the increase of the reference happens |
| 87 | * Thread A |
| 88 | * Thread B |
| 89 | * WRITE_ONCE(wait.state, STATE_NONE); |
| 90 | * schedule_hrtimeout() |
| 91 | * wake_q_add(A) |
| 92 | * if (cmpxchg()) // success |
| 93 | * ->state = STATE_READY (reordered) |
| 94 | * <timeout returns> |
| 95 | * if (wait.state == STATE_READY) return; |
| 96 | * sysret to user space |
| 97 | * sys_exit() |
| 98 | * get_task_struct() // UaF |
| 99 | * |
| 100 | * Solution: Use wake_q_add_safe() and perform the get_task_struct() before |
| 101 | * the smp_store_release() that does ->state = STATE_READY. |
| 102 | * |
| 103 | * 2) Without proper _release/_acquire barriers, the woken up task |
| 104 | * could read stale data |
| 105 | * |
| 106 | * Thread A |
| 107 | * Thread B |
| 108 | * do_mq_timedreceive |
| 109 | * WRITE_ONCE(wait.state, STATE_NONE); |
| 110 | * schedule_hrtimeout() |
| 111 | * state = STATE_READY; |
| 112 | * <timeout returns> |
| 113 | * if (wait.state == STATE_READY) return; |
| 114 | * msg_ptr = wait.msg; // Access to stale data! |
| 115 | * receiver->msg = message; (reordered) |
| 116 | * |
| 117 | * Solution: use _release and _acquire barriers. |
| 118 | * |
| 119 | * 3) There is intentionally no barrier when setting current->state |
| 120 | * to TASK_INTERRUPTIBLE: spin_unlock(&info->lock) provides the |
| 121 | * release memory barrier, and the wakeup is triggered when holding |
| 122 | * info->lock, i.e. spin_lock(&info->lock) provided a pairing |
| 123 | * acquire memory barrier. |
| 124 | */ |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | struct ext_wait_queue { /* queue of sleeping tasks */ |
| 127 | struct task_struct *task; |
| 128 | struct list_head list; |
| 129 | struct msg_msg *msg; /* ptr of loaded message */ |
| 130 | int state; /* one of STATE_* values */ |
| 131 | }; |
| 132 | |
| 133 | struct mqueue_inode_info { |
| 134 | spinlock_t lock; |
| 135 | struct inode vfs_inode; |
| 136 | wait_queue_head_t wait_q; |
| 137 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 138 | struct rb_root msg_tree; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 139 | struct rb_node *msg_tree_rightmost; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 140 | struct posix_msg_tree_node *node_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | struct mq_attr attr; |
| 142 | |
| 143 | struct sigevent notify; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 144 | struct pid *notify_owner; |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 145 | u32 notify_self_exec_id; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 146 | struct user_namespace *notify_user_ns; |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 147 | struct user_struct *user; /* user who created, for accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | struct sock *notify_sock; |
| 149 | struct sk_buff *notify_cookie; |
| 150 | |
| 151 | /* for tasks waiting for free space and messages, respectively */ |
| 152 | struct ext_wait_queue e_wait_q[2]; |
| 153 | |
| 154 | unsigned long qsize; /* size of queue in memory (sum of all msgs) */ |
| 155 | }; |
| 156 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 157 | static struct file_system_type mqueue_fs_type; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 158 | static const struct inode_operations mqueue_dir_inode_operations; |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 159 | static const struct file_operations mqueue_file_operations; |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 160 | static const struct super_operations mqueue_super_ops; |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 161 | static const struct fs_context_operations mqueue_fs_context_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | static void remove_notification(struct mqueue_inode_info *info); |
| 163 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 164 | static struct kmem_cache *mqueue_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 166 | static struct ctl_table_header *mq_sysctl_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode) |
| 169 | { |
| 170 | return container_of(inode, struct mqueue_inode_info, vfs_inode); |
| 171 | } |
| 172 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 173 | /* |
| 174 | * This routine should be called with the mq_lock held. |
| 175 | */ |
| 176 | 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] | 177 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 178 | return get_ipc_ns(inode->i_sb->s_fs_info); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 181 | static struct ipc_namespace *get_ns_from_inode(struct inode *inode) |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 182 | { |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 183 | struct ipc_namespace *ns; |
| 184 | |
| 185 | spin_lock(&mq_lock); |
| 186 | ns = __get_ns_from_inode(inode); |
| 187 | spin_unlock(&mq_lock); |
| 188 | return ns; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 191 | /* Auxiliary functions to manipulate messages' list */ |
| 192 | static int msg_insert(struct msg_msg *msg, struct mqueue_inode_info *info) |
| 193 | { |
| 194 | struct rb_node **p, *parent = NULL; |
| 195 | struct posix_msg_tree_node *leaf; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 196 | bool rightmost = true; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 197 | |
| 198 | p = &info->msg_tree.rb_node; |
| 199 | while (*p) { |
| 200 | parent = *p; |
| 201 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
| 202 | |
| 203 | if (likely(leaf->priority == msg->m_type)) |
| 204 | goto insert_msg; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 205 | else if (msg->m_type < leaf->priority) { |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 206 | p = &(*p)->rb_left; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 207 | rightmost = false; |
| 208 | } else |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 209 | p = &(*p)->rb_right; |
| 210 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 211 | if (info->node_cache) { |
| 212 | leaf = info->node_cache; |
| 213 | info->node_cache = NULL; |
| 214 | } else { |
| 215 | leaf = kmalloc(sizeof(*leaf), GFP_ATOMIC); |
| 216 | if (!leaf) |
| 217 | return -ENOMEM; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 218 | INIT_LIST_HEAD(&leaf->msg_list); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 219 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 220 | leaf->priority = msg->m_type; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 221 | |
| 222 | if (rightmost) |
| 223 | info->msg_tree_rightmost = &leaf->rb_node; |
| 224 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 225 | rb_link_node(&leaf->rb_node, parent, p); |
| 226 | rb_insert_color(&leaf->rb_node, &info->msg_tree); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 227 | insert_msg: |
| 228 | info->attr.mq_curmsgs++; |
| 229 | info->qsize += msg->m_ts; |
| 230 | list_add_tail(&msg->m_list, &leaf->msg_list); |
| 231 | return 0; |
| 232 | } |
| 233 | |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 234 | static inline void msg_tree_erase(struct posix_msg_tree_node *leaf, |
| 235 | struct mqueue_inode_info *info) |
| 236 | { |
| 237 | struct rb_node *node = &leaf->rb_node; |
| 238 | |
| 239 | if (info->msg_tree_rightmost == node) |
| 240 | info->msg_tree_rightmost = rb_prev(node); |
| 241 | |
| 242 | rb_erase(node, &info->msg_tree); |
Somala Swaraj | 43afe4d | 2020-04-06 20:12:53 -0700 | [diff] [blame] | 243 | if (info->node_cache) |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 244 | kfree(leaf); |
Somala Swaraj | 43afe4d | 2020-04-06 20:12:53 -0700 | [diff] [blame] | 245 | else |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 246 | info->node_cache = leaf; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 249 | static inline struct msg_msg *msg_get(struct mqueue_inode_info *info) |
| 250 | { |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 251 | struct rb_node *parent = NULL; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 252 | struct posix_msg_tree_node *leaf; |
| 253 | struct msg_msg *msg; |
| 254 | |
| 255 | try_again: |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 256 | /* |
| 257 | * During insert, low priorities go to the left and high to the |
| 258 | * right. On receive, we want the highest priorities first, so |
| 259 | * walk all the way to the right. |
| 260 | */ |
| 261 | parent = info->msg_tree_rightmost; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 262 | if (!parent) { |
| 263 | if (info->attr.mq_curmsgs) { |
| 264 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 265 | "no tree element, but supposedly messages " |
| 266 | "should exist!\n"); |
| 267 | info->attr.mq_curmsgs = 0; |
| 268 | } |
| 269 | return NULL; |
| 270 | } |
| 271 | leaf = rb_entry(parent, struct posix_msg_tree_node, rb_node); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 272 | if (unlikely(list_empty(&leaf->msg_list))) { |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 273 | pr_warn_once("Inconsistency in POSIX message queue, " |
| 274 | "empty leaf node but we haven't implemented " |
| 275 | "lazy leaf delete!\n"); |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 276 | msg_tree_erase(leaf, info); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 277 | goto try_again; |
| 278 | } else { |
| 279 | msg = list_first_entry(&leaf->msg_list, |
| 280 | struct msg_msg, m_list); |
| 281 | list_del(&msg->m_list); |
| 282 | if (list_empty(&leaf->msg_list)) { |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 283 | msg_tree_erase(leaf, info); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 284 | } |
| 285 | } |
| 286 | info->attr.mq_curmsgs--; |
| 287 | info->qsize -= msg->m_ts; |
| 288 | return msg; |
| 289 | } |
| 290 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 291 | static struct inode *mqueue_get_inode(struct super_block *sb, |
Al Viro | 1b9d5ff7 | 2011-07-24 14:18:20 -0400 | [diff] [blame] | 292 | struct ipc_namespace *ipc_ns, umode_t mode, |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 293 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 295 | struct user_struct *u = current_user(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | struct inode *inode; |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 297 | int ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | inode = new_inode(sb); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 300 | if (!inode) |
| 301 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 303 | inode->i_ino = get_next_ino(); |
| 304 | inode->i_mode = mode; |
| 305 | inode->i_uid = current_fsuid(); |
| 306 | inode->i_gid = current_fsgid(); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 307 | inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 309 | if (S_ISREG(mode)) { |
| 310 | struct mqueue_inode_info *info; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 311 | unsigned long mq_bytes, mq_treesize; |
André Goddard Rosa | c8308b1 | 2010-02-23 04:04:23 -0300 | [diff] [blame] | 312 | |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 313 | inode->i_fop = &mqueue_file_operations; |
| 314 | inode->i_size = FILENT_SIZE; |
| 315 | /* mqueue specific info */ |
| 316 | info = MQUEUE_I(inode); |
| 317 | spin_lock_init(&info->lock); |
| 318 | init_waitqueue_head(&info->wait_q); |
| 319 | INIT_LIST_HEAD(&info->e_wait_q[0].list); |
| 320 | INIT_LIST_HEAD(&info->e_wait_q[1].list); |
| 321 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 322 | info->notify_user_ns = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 323 | info->qsize = 0; |
| 324 | info->user = NULL; /* set when all is ok */ |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 325 | info->msg_tree = RB_ROOT; |
Davidlohr Bueso | a5091fd | 2019-05-14 15:46:26 -0700 | [diff] [blame] | 326 | info->msg_tree_rightmost = NULL; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 327 | info->node_cache = NULL; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 328 | memset(&info->attr, 0, sizeof(info->attr)); |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 329 | info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, |
| 330 | ipc_ns->mq_msg_default); |
| 331 | info->attr.mq_msgsize = min(ipc_ns->mq_msgsize_max, |
| 332 | ipc_ns->mq_msgsize_default); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 333 | if (attr) { |
| 334 | info->attr.mq_maxmsg = attr->mq_maxmsg; |
| 335 | info->attr.mq_msgsize = attr->mq_msgsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 337 | /* |
| 338 | * We used to allocate a static array of pointers and account |
| 339 | * the size of that array as well as one msg_msg struct per |
| 340 | * possible message into the queue size. That's no longer |
| 341 | * accurate as the queue is now an rbtree and will grow and |
| 342 | * shrink depending on usage patterns. We can, however, still |
| 343 | * account one msg_msg struct per message, but the nodes are |
| 344 | * allocated depending on priority usage, and most programs |
| 345 | * only use one, or a handful, of priorities. However, since |
| 346 | * this is pinned memory, we need to assume worst case, so |
| 347 | * that means the min(mq_maxmsg, max_priorities) * struct |
| 348 | * posix_msg_tree_node. |
| 349 | */ |
Al Viro | 05c1b29 | 2017-12-01 17:43:43 -0500 | [diff] [blame] | 350 | |
| 351 | ret = -EINVAL; |
| 352 | if (info->attr.mq_maxmsg <= 0 || info->attr.mq_msgsize <= 0) |
| 353 | goto out_inode; |
| 354 | if (capable(CAP_SYS_RESOURCE)) { |
| 355 | if (info->attr.mq_maxmsg > HARD_MSGMAX || |
| 356 | info->attr.mq_msgsize > HARD_MSGSIZEMAX) |
| 357 | goto out_inode; |
| 358 | } else { |
| 359 | if (info->attr.mq_maxmsg > ipc_ns->mq_msg_max || |
| 360 | info->attr.mq_msgsize > ipc_ns->mq_msgsize_max) |
| 361 | goto out_inode; |
| 362 | } |
| 363 | ret = -EOVERFLOW; |
| 364 | /* check for overflow */ |
| 365 | if (info->attr.mq_msgsize > ULONG_MAX/info->attr.mq_maxmsg) |
| 366 | goto out_inode; |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 367 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 368 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 369 | sizeof(struct posix_msg_tree_node); |
Al Viro | 05c1b29 | 2017-12-01 17:43:43 -0500 | [diff] [blame] | 370 | mq_bytes = info->attr.mq_maxmsg * info->attr.mq_msgsize; |
| 371 | if (mq_bytes + mq_treesize < mq_bytes) |
| 372 | goto out_inode; |
| 373 | mq_bytes += mq_treesize; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 374 | spin_lock(&mq_lock); |
| 375 | if (u->mq_bytes + mq_bytes < u->mq_bytes || |
Davidlohr Bueso | 2a4e64b | 2012-01-20 14:34:01 -0800 | [diff] [blame] | 376 | u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) { |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 377 | spin_unlock(&mq_lock); |
| 378 | /* mqueue_evict_inode() releases info->messages */ |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 379 | ret = -EMFILE; |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 380 | goto out_inode; |
| 381 | } |
| 382 | u->mq_bytes += mq_bytes; |
| 383 | spin_unlock(&mq_lock); |
| 384 | |
| 385 | /* all is ok */ |
| 386 | info->user = get_uid(u); |
| 387 | } else if (S_ISDIR(mode)) { |
| 388 | inc_nlink(inode); |
| 389 | /* Some things misbehave if size == 0 on a directory */ |
| 390 | inode->i_size = 2 * DIRENT_SIZE; |
| 391 | inode->i_op = &mqueue_dir_inode_operations; |
| 392 | inode->i_fop = &simple_dir_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | return inode; |
| 396 | out_inode: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | iput(inode); |
Jiri Slaby | 0471520 | 2011-07-26 16:08:46 -0700 | [diff] [blame] | 398 | err: |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 399 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 402 | static int mqueue_fill_super(struct super_block *sb, struct fs_context *fc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
| 404 | struct inode *inode; |
Eric W. Biederman | cfb2f6f | 2018-03-24 11:28:14 -0500 | [diff] [blame] | 405 | struct ipc_namespace *ns = sb->s_fs_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
Eric W. Biederman | a2982cc | 2016-06-09 15:34:02 -0500 | [diff] [blame] | 407 | sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 408 | sb->s_blocksize = PAGE_SIZE; |
| 409 | sb->s_blocksize_bits = PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | sb->s_magic = MQUEUE_MAGIC; |
| 411 | sb->s_op = &mqueue_super_ops; |
| 412 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 413 | inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL); |
| 414 | if (IS_ERR(inode)) |
| 415 | return PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 417 | sb->s_root = d_make_root(inode); |
| 418 | if (!sb->s_root) |
| 419 | return -ENOMEM; |
| 420 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 423 | static int mqueue_get_tree(struct fs_context *fc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 425 | struct mqueue_fs_context *ctx = fc->fs_private; |
| 426 | |
Al Viro | 533770c | 2019-09-03 19:05:48 -0400 | [diff] [blame] | 427 | return get_tree_keyed(fc, mqueue_fill_super, ctx->ipc_ns); |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | static void mqueue_fs_context_free(struct fs_context *fc) |
| 431 | { |
| 432 | struct mqueue_fs_context *ctx = fc->fs_private; |
| 433 | |
Al Viro | 709a643d | 2019-05-12 17:46:05 -0400 | [diff] [blame] | 434 | put_ipc_ns(ctx->ipc_ns); |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 435 | kfree(ctx); |
| 436 | } |
| 437 | |
| 438 | static int mqueue_init_fs_context(struct fs_context *fc) |
| 439 | { |
| 440 | struct mqueue_fs_context *ctx; |
| 441 | |
| 442 | ctx = kzalloc(sizeof(struct mqueue_fs_context), GFP_KERNEL); |
| 443 | if (!ctx) |
| 444 | return -ENOMEM; |
| 445 | |
| 446 | ctx->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns); |
Al Viro | 709a643d | 2019-05-12 17:46:05 -0400 | [diff] [blame] | 447 | put_user_ns(fc->user_ns); |
| 448 | fc->user_ns = get_user_ns(ctx->ipc_ns->user_ns); |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 449 | fc->fs_private = ctx; |
| 450 | fc->ops = &mqueue_fs_context_ops; |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static struct vfsmount *mq_create_mount(struct ipc_namespace *ns) |
| 455 | { |
| 456 | struct mqueue_fs_context *ctx; |
| 457 | struct fs_context *fc; |
| 458 | struct vfsmount *mnt; |
| 459 | |
| 460 | fc = fs_context_for_mount(&mqueue_fs_type, SB_KERNMOUNT); |
| 461 | if (IS_ERR(fc)) |
| 462 | return ERR_CAST(fc); |
| 463 | |
| 464 | ctx = fc->fs_private; |
| 465 | put_ipc_ns(ctx->ipc_ns); |
| 466 | ctx->ipc_ns = get_ipc_ns(ns); |
Al Viro | 709a643d | 2019-05-12 17:46:05 -0400 | [diff] [blame] | 467 | put_user_ns(fc->user_ns); |
| 468 | fc->user_ns = get_user_ns(ctx->ipc_ns->user_ns); |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 469 | |
| 470 | mnt = fc_mount(fc); |
| 471 | put_fs_context(fc); |
| 472 | return mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 475 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
| 477 | struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo; |
| 478 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 479 | inode_init_once(&p->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static struct inode *mqueue_alloc_inode(struct super_block *sb) |
| 483 | { |
| 484 | struct mqueue_inode_info *ei; |
| 485 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 486 | ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (!ei) |
| 488 | return NULL; |
| 489 | return &ei->vfs_inode; |
| 490 | } |
| 491 | |
Al Viro | 015d795 | 2019-04-15 22:30:30 -0400 | [diff] [blame] | 492 | static void mqueue_free_inode(struct inode *inode) |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 493 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 494 | kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode)); |
| 495 | } |
| 496 | |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 497 | static void mqueue_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | struct mqueue_inode_info *info; |
| 500 | struct user_struct *user; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 501 | struct ipc_namespace *ipc_ns; |
Li Rongqing | d6a2946 | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 502 | struct msg_msg *msg, *nmsg; |
| 503 | LIST_HEAD(tmp_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 505 | clear_inode(inode); |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 506 | |
| 507 | if (S_ISDIR(inode->i_mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return; |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 509 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 510 | ipc_ns = get_ns_from_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | info = MQUEUE_I(inode); |
| 512 | spin_lock(&info->lock); |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 513 | while ((msg = msg_get(info)) != NULL) |
Li Rongqing | d6a2946 | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 514 | list_add_tail(&msg->m_list, &tmp_msg); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 515 | kfree(info->node_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | spin_unlock(&info->lock); |
| 517 | |
Li Rongqing | d6a2946 | 2019-05-14 15:46:20 -0700 | [diff] [blame] | 518 | list_for_each_entry_safe(msg, nmsg, &tmp_msg, m_list) { |
| 519 | list_del(&msg->m_list); |
| 520 | free_msg(msg); |
| 521 | } |
| 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | user = info->user; |
| 524 | if (user) { |
Kees Cook | a318f12 | 2019-07-16 16:30:21 -0700 | [diff] [blame] | 525 | unsigned long mq_bytes, mq_treesize; |
| 526 | |
| 527 | /* Total amount of bytes accounted for the mqueue */ |
| 528 | mq_treesize = info->attr.mq_maxmsg * sizeof(struct msg_msg) + |
| 529 | min_t(unsigned int, info->attr.mq_maxmsg, MQ_PRIO_MAX) * |
| 530 | sizeof(struct posix_msg_tree_node); |
| 531 | |
| 532 | mq_bytes = mq_treesize + (info->attr.mq_maxmsg * |
| 533 | info->attr.mq_msgsize); |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | spin_lock(&mq_lock); |
| 536 | user->mq_bytes -= mq_bytes; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 537 | /* |
| 538 | * get_ns_from_inode() ensures that the |
| 539 | * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns |
| 540 | * to which we now hold a reference, or it is NULL. |
| 541 | * We can't put it here under mq_lock, though. |
| 542 | */ |
| 543 | if (ipc_ns) |
| 544 | ipc_ns->mq_queues_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | spin_unlock(&mq_lock); |
| 546 | free_uid(user); |
| 547 | } |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 548 | if (ipc_ns) |
| 549 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
Al Viro | eecec19 | 2017-12-01 17:26:05 -0500 | [diff] [blame] | 552 | static int mqueue_create_attr(struct dentry *dentry, umode_t mode, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | { |
Al Viro | eecec19 | 2017-12-01 17:26:05 -0500 | [diff] [blame] | 554 | struct inode *dir = dentry->d_parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | struct inode *inode; |
Al Viro | eecec19 | 2017-12-01 17:26:05 -0500 | [diff] [blame] | 556 | struct mq_attr *attr = arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | int error; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 558 | struct ipc_namespace *ipc_ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
| 560 | spin_lock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 561 | ipc_ns = __get_ns_from_inode(dir); |
| 562 | if (!ipc_ns) { |
| 563 | error = -EACCES; |
| 564 | goto out_unlock; |
| 565 | } |
Davidlohr Bueso | f3713fd | 2014-02-25 15:01:45 -0800 | [diff] [blame] | 566 | |
| 567 | if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max && |
| 568 | !capable(CAP_SYS_RESOURCE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | error = -ENOSPC; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 570 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 572 | ipc_ns->mq_queues_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | spin_unlock(&mq_lock); |
| 574 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 575 | inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr); |
Jiri Slaby | d40dcdb | 2011-07-26 16:08:47 -0700 | [diff] [blame] | 576 | if (IS_ERR(inode)) { |
| 577 | error = PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | spin_lock(&mq_lock); |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 579 | ipc_ns->mq_queues_count--; |
| 580 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 583 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | dir->i_size += DIRENT_SIZE; |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 585 | dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | d_instantiate(dentry, inode); |
| 588 | dget(dentry); |
| 589 | return 0; |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 590 | out_unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | spin_unlock(&mq_lock); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 592 | if (ipc_ns) |
| 593 | put_ipc_ns(ipc_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return error; |
| 595 | } |
| 596 | |
Al Viro | eecec19 | 2017-12-01 17:26:05 -0500 | [diff] [blame] | 597 | static int mqueue_create(struct inode *dir, struct dentry *dentry, |
| 598 | umode_t mode, bool excl) |
| 599 | { |
| 600 | return mqueue_create_attr(dentry, mode, NULL); |
| 601 | } |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | static int mqueue_unlink(struct inode *dir, struct dentry *dentry) |
| 604 | { |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 605 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 607 | dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | dir->i_size -= DIRENT_SIZE; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 609 | drop_nlink(inode); |
| 610 | dput(dentry); |
| 611 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | } |
| 613 | |
| 614 | /* |
| 615 | * This is routine for system read from queue file. |
| 616 | * To avoid mess with doing here some sort of mq_receive we allow |
| 617 | * to read only queue size & notification info (the only values |
| 618 | * that are interesting from user point of view and aren't accessible |
| 619 | * through std routines) |
| 620 | */ |
| 621 | 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] | 622 | size_t count, loff_t *off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 624 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | char buffer[FILENT_SIZE]; |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 626 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | spin_lock(&info->lock); |
| 629 | snprintf(buffer, sizeof(buffer), |
| 630 | "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d\n", |
| 631 | info->qsize, |
| 632 | info->notify_owner ? info->notify.sigev_notify : 0, |
| 633 | (info->notify_owner && |
| 634 | info->notify.sigev_notify == SIGEV_SIGNAL) ? |
| 635 | info->notify.sigev_signo : 0, |
Pavel Emelyanov | 6c5f3e7 | 2008-02-08 04:19:20 -0800 | [diff] [blame] | 636 | pid_vnr(info->notify_owner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | spin_unlock(&info->lock); |
| 638 | buffer[sizeof(buffer)-1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Akinobu Mita | f1a43f9 | 2008-07-25 01:48:07 -0700 | [diff] [blame] | 640 | ret = simple_read_from_buffer(u_data, count, off, buffer, |
| 641 | strlen(buffer)); |
| 642 | if (ret <= 0) |
| 643 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 645 | 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] | 646 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 649 | static int mqueue_flush_file(struct file *filp, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 651 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | spin_lock(&info->lock); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 654 | if (task_tgid(current) == info->notify_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | remove_notification(info); |
| 656 | |
| 657 | spin_unlock(&info->lock); |
| 658 | return 0; |
| 659 | } |
| 660 | |
Al Viro | 9dd9574 | 2017-07-03 00:42:43 -0400 | [diff] [blame] | 661 | static __poll_t mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 663 | struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp)); |
Al Viro | 9dd9574 | 2017-07-03 00:42:43 -0400 | [diff] [blame] | 664 | __poll_t retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
| 666 | poll_wait(filp, &info->wait_q, poll_tab); |
| 667 | |
| 668 | spin_lock(&info->lock); |
| 669 | if (info->attr.mq_curmsgs) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 670 | retval = EPOLLIN | EPOLLRDNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
| 672 | if (info->attr.mq_curmsgs < info->attr.mq_maxmsg) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 673 | retval |= EPOLLOUT | EPOLLWRNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | spin_unlock(&info->lock); |
| 675 | |
| 676 | return retval; |
| 677 | } |
| 678 | |
| 679 | /* Adds current to info->e_wait_q[sr] before element with smaller prio */ |
| 680 | static void wq_add(struct mqueue_inode_info *info, int sr, |
| 681 | struct ext_wait_queue *ewp) |
| 682 | { |
| 683 | struct ext_wait_queue *walk; |
| 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | list_for_each_entry(walk, &info->e_wait_q[sr].list, list) { |
Jonathan Haws | 68e34f4 | 2018-02-06 15:40:52 -0800 | [diff] [blame] | 686 | if (walk->task->prio <= current->prio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | list_add_tail(&ewp->list, &walk->list); |
| 688 | return; |
| 689 | } |
| 690 | } |
| 691 | list_add_tail(&ewp->list, &info->e_wait_q[sr].list); |
| 692 | } |
| 693 | |
| 694 | /* |
| 695 | * Puts current task to sleep. Caller must hold queue lock. After return |
| 696 | * lock isn't held. |
| 697 | * sr: SEND or RECV |
| 698 | */ |
| 699 | static int wq_sleep(struct mqueue_inode_info *info, int sr, |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 700 | ktime_t *timeout, struct ext_wait_queue *ewp) |
Luc Van Oostenryck | eac0b1c | 2017-02-27 14:28:21 -0800 | [diff] [blame] | 701 | __releases(&info->lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | int retval; |
| 704 | signed long time; |
| 705 | |
| 706 | wq_add(info, sr, ewp); |
| 707 | |
| 708 | for (;;) { |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 709 | /* memory barrier not required, we hold info->lock */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 710 | __set_current_state(TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | spin_unlock(&info->lock); |
Wanlong Gao | 32ea845 | 2011-10-31 17:06:35 -0700 | [diff] [blame] | 713 | time = schedule_hrtimeout_range_clock(timeout, 0, |
| 714 | HRTIMER_MODE_ABS, CLOCK_REALTIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 716 | if (READ_ONCE(ewp->state) == STATE_READY) { |
| 717 | /* see MQ_BARRIER for purpose/pairing */ |
| 718 | smp_acquire__after_ctrl_dep(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | retval = 0; |
| 720 | goto out; |
| 721 | } |
| 722 | spin_lock(&info->lock); |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 723 | |
| 724 | /* we hold info->lock, so no memory barrier required */ |
| 725 | if (READ_ONCE(ewp->state) == STATE_READY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | retval = 0; |
| 727 | goto out_unlock; |
| 728 | } |
| 729 | if (signal_pending(current)) { |
| 730 | retval = -ERESTARTSYS; |
| 731 | break; |
| 732 | } |
| 733 | if (time == 0) { |
| 734 | retval = -ETIMEDOUT; |
| 735 | break; |
| 736 | } |
| 737 | } |
| 738 | list_del(&ewp->list); |
| 739 | out_unlock: |
| 740 | spin_unlock(&info->lock); |
| 741 | out: |
| 742 | return retval; |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * Returns waiting task that should be serviced first or NULL if none exists |
| 747 | */ |
| 748 | static struct ext_wait_queue *wq_get_first_waiter( |
| 749 | struct mqueue_inode_info *info, int sr) |
| 750 | { |
| 751 | struct list_head *ptr; |
| 752 | |
| 753 | ptr = info->e_wait_q[sr].list.prev; |
| 754 | if (ptr == &info->e_wait_q[sr].list) |
| 755 | return NULL; |
| 756 | return list_entry(ptr, struct ext_wait_queue, list); |
| 757 | } |
| 758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | static inline void set_cookie(struct sk_buff *skb, char code) |
| 761 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 762 | ((char *)skb->data)[NOTIFY_COOKIE_LEN-1] = code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | /* |
| 766 | * The next function is only to split too long sys_mq_timedsend |
| 767 | */ |
| 768 | static void __do_notify(struct mqueue_inode_info *info) |
| 769 | { |
| 770 | /* notification |
| 771 | * invoked when there is registered process and there isn't process |
| 772 | * waiting synchronously for message AND state of queue changed from |
| 773 | * empty to not empty. Here we are sure that no one is waiting |
| 774 | * synchronously. */ |
| 775 | if (info->notify_owner && |
| 776 | info->attr.mq_curmsgs == 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | switch (info->notify.sigev_notify) { |
| 778 | case SIGEV_NONE: |
| 779 | break; |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 780 | case SIGEV_SIGNAL: { |
| 781 | struct kernel_siginfo sig_i; |
| 782 | struct task_struct *task; |
| 783 | |
| 784 | /* do_mq_notify() accepts sigev_signo == 0, why?? */ |
| 785 | if (!info->notify.sigev_signo) |
| 786 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Eric W. Biederman | faf1f22 | 2018-01-05 17:27:42 -0600 | [diff] [blame] | 788 | clear_siginfo(&sig_i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | sig_i.si_signo = info->notify.sigev_signo; |
| 790 | sig_i.si_errno = 0; |
| 791 | sig_i.si_code = SI_MESGQ; |
| 792 | sig_i.si_value = info->notify.sigev_value; |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 793 | rcu_read_lock(); |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 794 | /* map current pid/uid into info->owner's namespaces */ |
Sukadev Bhattiprolu | a668499 | 2009-01-07 18:08:50 -0800 | [diff] [blame] | 795 | sig_i.si_pid = task_tgid_nr_ns(current, |
| 796 | ns_of_pid(info->notify_owner)); |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 797 | sig_i.si_uid = from_kuid_munged(info->notify_user_ns, |
| 798 | current_uid()); |
| 799 | /* |
| 800 | * We can't use kill_pid_info(), this signal should |
| 801 | * bypass check_kill_permission(). It is from kernel |
| 802 | * but si_fromuser() can't know this. |
| 803 | * We do check the self_exec_id, to avoid sending |
| 804 | * signals to programs that don't expect them. |
| 805 | */ |
| 806 | task = pid_task(info->notify_owner, PIDTYPE_TGID); |
| 807 | if (task && task->self_exec_id == |
| 808 | info->notify_self_exec_id) { |
| 809 | do_send_sig_info(info->notify.sigev_signo, |
| 810 | &sig_i, task, PIDTYPE_TGID); |
| 811 | } |
Serge E. Hallyn | 6b550f9 | 2012-01-10 15:11:37 -0800 | [diff] [blame] | 812 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | break; |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 814 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | case SIGEV_THREAD: |
| 816 | set_cookie(info->notify_cookie, NOTIFY_WOKENUP); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 817 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | break; |
| 819 | } |
| 820 | /* after notification unregisters process */ |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 821 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 822 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 823 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 824 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | wake_up(&info->wait_q); |
| 827 | } |
| 828 | |
Arnd Bergmann | 21fc538 | 2018-04-13 13:58:00 +0200 | [diff] [blame] | 829 | static int prepare_timeout(const struct __kernel_timespec __user *u_abs_timeout, |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 830 | struct timespec64 *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 832 | if (get_timespec64(ts, u_abs_timeout)) |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 833 | return -EFAULT; |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 834 | if (!timespec64_valid(ts)) |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 835 | return -EINVAL; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 836 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | static void remove_notification(struct mqueue_inode_info *info) |
| 840 | { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 841 | if (info->notify_owner != NULL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | info->notify.sigev_notify == SIGEV_THREAD) { |
| 843 | set_cookie(info->notify_cookie, NOTIFY_REMOVED); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 844 | netlink_sendskb(info->notify_sock, info->notify_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 846 | put_pid(info->notify_owner); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 847 | put_user_ns(info->notify_user_ns); |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 848 | info->notify_owner = NULL; |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 849 | info->notify_user_ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | } |
| 851 | |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 852 | static int prepare_open(struct dentry *dentry, int oflag, int ro, |
| 853 | umode_t mode, struct filename *name, |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 854 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 856 | static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE, |
| 857 | MAY_READ | MAY_WRITE }; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 858 | int acc; |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 859 | |
Al Viro | 9b20d7f | 2017-12-01 17:57:02 -0500 | [diff] [blame] | 860 | if (d_really_is_negative(dentry)) { |
| 861 | if (!(oflag & O_CREAT)) |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 862 | return -ENOENT; |
Al Viro | 9b20d7f | 2017-12-01 17:57:02 -0500 | [diff] [blame] | 863 | if (ro) |
| 864 | return ro; |
| 865 | audit_inode_parent_hidden(name, dentry->d_parent); |
| 866 | return vfs_mkobj(dentry, mode & ~current_umask(), |
| 867 | mqueue_create_attr, attr); |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 868 | } |
Al Viro | 9b20d7f | 2017-12-01 17:57:02 -0500 | [diff] [blame] | 869 | /* it already existed */ |
| 870 | audit_inode(name, dentry, 0); |
| 871 | if ((oflag & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) |
| 872 | return -EEXIST; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 873 | if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) |
Al Viro | af4a537 | 2017-12-01 17:34:22 -0500 | [diff] [blame] | 874 | return -EINVAL; |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 875 | acc = oflag2acc[oflag & O_ACCMODE]; |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 876 | return inode_permission(d_inode(dentry), acc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 879 | static int do_mq_open(const char __user *u_name, int oflag, umode_t mode, |
| 880 | struct mq_attr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | { |
Eric W. Biederman | cfb2f6f | 2018-03-24 11:28:14 -0500 | [diff] [blame] | 882 | struct vfsmount *mnt = current->nsproxy->ipc_ns->mq_mnt; |
| 883 | struct dentry *root = mnt->mnt_root; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 884 | struct filename *name; |
Al Viro | a713fd7 | 2017-12-01 18:01:09 -0500 | [diff] [blame] | 885 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | int fd, error; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 887 | int ro; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 889 | audit_mq_open(oflag, mode, attr); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 890 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | if (IS_ERR(name = getname(u_name))) |
| 892 | return PTR_ERR(name); |
| 893 | |
Ulrich Drepper | 269f213 | 2008-05-03 15:28:45 -0400 | [diff] [blame] | 894 | fd = get_unused_fd_flags(O_CLOEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | if (fd < 0) |
| 896 | goto out_putname; |
| 897 | |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 898 | ro = mnt_want_write(mnt); /* we'll drop it in any case */ |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 899 | inode_lock(d_inode(root)); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 900 | path.dentry = lookup_one_len(name->name, root, strlen(name->name)); |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 901 | if (IS_ERR(path.dentry)) { |
| 902 | error = PTR_ERR(path.dentry); |
André Goddard Rosa | 4294a8e | 2010-02-23 04:04:28 -0300 | [diff] [blame] | 903 | goto out_putfd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | } |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 905 | path.mnt = mntget(mnt); |
Al Viro | 066cc81 | 2017-12-01 17:51:39 -0500 | [diff] [blame] | 906 | error = prepare_open(path.dentry, oflag, ro, mode, name, attr); |
| 907 | if (!error) { |
| 908 | struct file *file = dentry_open(&path, oflag, current_cred()); |
| 909 | if (!IS_ERR(file)) |
| 910 | fd_install(fd, file); |
| 911 | else |
| 912 | error = PTR_ERR(file); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 913 | } |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 914 | path_put(&path); |
Alexander Viro | 7c7dce9 | 2006-01-14 15:29:55 -0500 | [diff] [blame] | 915 | out_putfd: |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 916 | if (error) { |
| 917 | put_unused_fd(fd); |
| 918 | fd = error; |
| 919 | } |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 920 | inode_unlock(d_inode(root)); |
Vladimir Davydov | 38d78e5 | 2013-03-22 15:04:51 -0700 | [diff] [blame] | 921 | if (!ro) |
| 922 | mnt_drop_write(mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | out_putname: |
| 924 | putname(name); |
| 925 | return fd; |
| 926 | } |
| 927 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 928 | SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, |
| 929 | struct mq_attr __user *, u_attr) |
| 930 | { |
| 931 | struct mq_attr attr; |
| 932 | if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr))) |
| 933 | return -EFAULT; |
| 934 | |
| 935 | return do_mq_open(u_name, oflag, mode, u_attr ? &attr : NULL); |
| 936 | } |
| 937 | |
Heiko Carstens | d5460c9 | 2009-01-14 14:14:27 +0100 | [diff] [blame] | 938 | SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | { |
| 940 | int err; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 941 | struct filename *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | struct dentry *dentry; |
| 943 | struct inode *inode = NULL; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 944 | struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 945 | struct vfsmount *mnt = ipc_ns->mq_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | name = getname(u_name); |
| 948 | if (IS_ERR(name)) |
| 949 | return PTR_ERR(name); |
| 950 | |
Jeff Layton | 79f6530 | 2013-07-08 15:59:36 -0700 | [diff] [blame] | 951 | audit_inode_parent_hidden(name, mnt->mnt_root); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 952 | err = mnt_want_write(mnt); |
| 953 | if (err) |
| 954 | goto out_name; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 955 | inode_lock_nested(d_inode(mnt->mnt_root), I_MUTEX_PARENT); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 956 | dentry = lookup_one_len(name->name, mnt->mnt_root, |
| 957 | strlen(name->name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | if (IS_ERR(dentry)) { |
| 959 | err = PTR_ERR(dentry); |
| 960 | goto out_unlock; |
| 961 | } |
| 962 | |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 963 | inode = d_inode(dentry); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 964 | if (!inode) { |
| 965 | err = -ENOENT; |
| 966 | } else { |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 967 | ihold(inode); |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 968 | err = vfs_unlink(d_inode(dentry->d_parent), dentry, NULL); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 969 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | dput(dentry); |
| 971 | |
| 972 | out_unlock: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 973 | inode_unlock(d_inode(mnt->mnt_root)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | if (inode) |
| 975 | iput(inode); |
Al Viro | 312b90f | 2012-08-06 10:18:17 +0400 | [diff] [blame] | 976 | mnt_drop_write(mnt); |
| 977 | out_name: |
| 978 | putname(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
| 980 | return err; |
| 981 | } |
| 982 | |
| 983 | /* Pipelined send and receive functions. |
| 984 | * |
| 985 | * If a receiver finds no waiting message, then it registers itself in the |
| 986 | * list of waiting receivers. A sender checks that list before adding the new |
| 987 | * message into the message array. If there is a waiting receiver, then it |
| 988 | * bypasses the message array and directly hands the message over to the |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 989 | * receiver. The receiver accepts the message and returns without grabbing the |
| 990 | * queue spinlock: |
| 991 | * |
| 992 | * - Set pointer to message. |
| 993 | * - Queue the receiver task for later wakeup (without the info->lock). |
| 994 | * - Update its state to STATE_READY. Now the receiver can continue. |
| 995 | * - Wake up the process after the lock is dropped. Should the process wake up |
| 996 | * before this wakeup (due to a timeout or a signal) it will either see |
| 997 | * 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] | 998 | * |
| 999 | * The same algorithm is used for senders. |
| 1000 | */ |
| 1001 | |
Davidlohr Bueso | ed29f17 | 2020-02-03 17:34:32 -0800 | [diff] [blame] | 1002 | static inline void __pipelined_op(struct wake_q_head *wake_q, |
| 1003 | struct mqueue_inode_info *info, |
| 1004 | struct ext_wait_queue *this) |
| 1005 | { |
| 1006 | list_del(&this->list); |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 1007 | get_task_struct(this->task); |
| 1008 | |
| 1009 | /* see MQ_BARRIER for purpose/pairing */ |
| 1010 | smp_store_release(&this->state, STATE_READY); |
| 1011 | wake_q_add_safe(wake_q, this->task); |
Davidlohr Bueso | ed29f17 | 2020-02-03 17:34:32 -0800 | [diff] [blame] | 1012 | } |
| 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | /* pipelined_send() - send a message directly to the task waiting in |
| 1015 | * sys_mq_timedreceive() (without inserting message into a queue). |
| 1016 | */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1017 | static inline void pipelined_send(struct wake_q_head *wake_q, |
| 1018 | struct mqueue_inode_info *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | struct msg_msg *message, |
| 1020 | struct ext_wait_queue *receiver) |
| 1021 | { |
| 1022 | receiver->msg = message; |
Davidlohr Bueso | ed29f17 | 2020-02-03 17:34:32 -0800 | [diff] [blame] | 1023 | __pipelined_op(wake_q, info, receiver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
| 1026 | /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() |
| 1027 | * 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] | 1028 | static inline void pipelined_receive(struct wake_q_head *wake_q, |
| 1029 | struct mqueue_inode_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | { |
| 1031 | struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND); |
| 1032 | |
| 1033 | if (!sender) { |
| 1034 | /* for poll */ |
| 1035 | wake_up_interruptible(&info->wait_q); |
| 1036 | return; |
| 1037 | } |
Doug Ledford | d662985 | 2012-05-31 16:26:35 -0700 | [diff] [blame] | 1038 | if (msg_insert(sender->msg, info)) |
| 1039 | return; |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1040 | |
Davidlohr Bueso | ed29f17 | 2020-02-03 17:34:32 -0800 | [diff] [blame] | 1041 | __pipelined_op(wake_q, info, sender); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | } |
| 1043 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1044 | static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr, |
| 1045 | size_t msg_len, unsigned int msg_prio, |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1046 | struct timespec64 *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1048 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | struct inode *inode; |
| 1050 | struct ext_wait_queue wait; |
| 1051 | struct ext_wait_queue *receiver; |
| 1052 | struct msg_msg *msg_ptr; |
| 1053 | struct mqueue_inode_info *info; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1054 | ktime_t expires, *timeout = NULL; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1055 | struct posix_msg_tree_node *new_leaf = NULL; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1056 | int ret = 0; |
Waiman Long | 194a6b5 | 2016-11-17 11:46:38 -0500 | [diff] [blame] | 1057 | DEFINE_WAKE_Q(wake_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
| 1059 | if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX)) |
| 1060 | return -EINVAL; |
| 1061 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1062 | if (ts) { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1063 | expires = timespec64_to_ktime(*ts); |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1064 | timeout = &expires; |
| 1065 | } |
| 1066 | |
| 1067 | audit_mq_sendrecv(mqdes, msg_len, msg_prio, ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1069 | f = fdget(mqdes); |
| 1070 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1071 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1073 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1075 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1076 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1077 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1079 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | info = MQUEUE_I(inode); |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 1081 | audit_file(f.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1083 | if (unlikely(!(f.file->f_mode & FMODE_WRITE))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1084 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1086 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | if (unlikely(msg_len > info->attr.mq_msgsize)) { |
| 1089 | ret = -EMSGSIZE; |
| 1090 | goto out_fput; |
| 1091 | } |
| 1092 | |
| 1093 | /* First try to allocate memory, before doing anything with |
| 1094 | * existing queues. */ |
| 1095 | msg_ptr = load_msg(u_msg_ptr, msg_len); |
| 1096 | if (IS_ERR(msg_ptr)) { |
| 1097 | ret = PTR_ERR(msg_ptr); |
| 1098 | goto out_fput; |
| 1099 | } |
| 1100 | msg_ptr->m_ts = msg_len; |
| 1101 | msg_ptr->m_type = msg_prio; |
| 1102 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1103 | /* |
| 1104 | * msg_insert really wants us to have a valid, spare node struct so |
| 1105 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1106 | * fall back to that if necessary. |
| 1107 | */ |
| 1108 | if (!info->node_cache) |
| 1109 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | spin_lock(&info->lock); |
| 1112 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1113 | if (!info->node_cache && new_leaf) { |
| 1114 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1115 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1116 | info->node_cache = new_leaf; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1117 | new_leaf = NULL; |
| 1118 | } else { |
| 1119 | kfree(new_leaf); |
| 1120 | } |
| 1121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1123 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | } else { |
| 1126 | wait.task = current; |
| 1127 | wait.msg = (void *) msg_ptr; |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 1128 | |
| 1129 | /* memory barrier not required, we hold info->lock */ |
| 1130 | WRITE_ONCE(wait.state, STATE_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | ret = wq_sleep(info, SEND, timeout, &wait); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1132 | /* |
| 1133 | * wq_sleep must be called with info->lock held, and |
| 1134 | * returns with the lock released |
| 1135 | */ |
| 1136 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | } else { |
| 1139 | receiver = wq_get_first_waiter(info, RECV); |
| 1140 | if (receiver) { |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1141 | pipelined_send(&wake_q, info, msg_ptr, receiver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } else { |
| 1143 | /* adds message to the queue */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1144 | ret = msg_insert(msg_ptr, info); |
| 1145 | if (ret) |
| 1146 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | __do_notify(info); |
| 1148 | } |
| 1149 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1150 | current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1152 | out_unlock: |
| 1153 | spin_unlock(&info->lock); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1154 | wake_up_q(&wake_q); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1155 | out_free: |
| 1156 | if (ret) |
| 1157 | free_msg(msg_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1159 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | out: |
| 1161 | return ret; |
| 1162 | } |
| 1163 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1164 | static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr, |
| 1165 | size_t msg_len, unsigned int __user *u_msg_prio, |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1166 | struct timespec64 *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | ssize_t ret; |
| 1169 | struct msg_msg *msg_ptr; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1170 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | struct inode *inode; |
| 1172 | struct mqueue_inode_info *info; |
| 1173 | struct ext_wait_queue wait; |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1174 | ktime_t expires, *timeout = NULL; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1175 | struct posix_msg_tree_node *new_leaf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1177 | if (ts) { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1178 | expires = timespec64_to_ktime(*ts); |
Carsten Emde | 9ca7d8e | 2010-04-02 22:40:20 +0200 | [diff] [blame] | 1179 | timeout = &expires; |
Al Viro | c32c8af | 2008-12-14 03:46:48 -0500 | [diff] [blame] | 1180 | } |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1181 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1182 | audit_mq_sendrecv(mqdes, msg_len, 0, ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1184 | f = fdget(mqdes); |
| 1185 | if (unlikely(!f.file)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1186 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1190 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1191 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1192 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1194 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | info = MQUEUE_I(inode); |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 1196 | audit_file(f.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1198 | if (unlikely(!(f.file->f_mode & FMODE_READ))) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1199 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | /* checks if buffer is big enough */ |
| 1204 | if (unlikely(msg_len < info->attr.mq_msgsize)) { |
| 1205 | ret = -EMSGSIZE; |
| 1206 | goto out_fput; |
| 1207 | } |
| 1208 | |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1209 | /* |
| 1210 | * msg_insert really wants us to have a valid, spare node struct so |
| 1211 | * it doesn't have to kmalloc a GFP_ATOMIC allocation, but it will |
| 1212 | * fall back to that if necessary. |
| 1213 | */ |
| 1214 | if (!info->node_cache) |
| 1215 | new_leaf = kmalloc(sizeof(*new_leaf), GFP_KERNEL); |
| 1216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | spin_lock(&info->lock); |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1218 | |
| 1219 | if (!info->node_cache && new_leaf) { |
| 1220 | /* Save our speculative allocation into the cache */ |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1221 | INIT_LIST_HEAD(&new_leaf->msg_list); |
| 1222 | info->node_cache = new_leaf; |
Doug Ledford | ce2d52c | 2012-05-31 16:26:38 -0700 | [diff] [blame] | 1223 | } else { |
| 1224 | kfree(new_leaf); |
| 1225 | } |
| 1226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | if (info->attr.mq_curmsgs == 0) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1228 | if (f.file->f_flags & O_NONBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | spin_unlock(&info->lock); |
| 1230 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } else { |
| 1232 | wait.task = current; |
Manfred Spraul | c5b2cbd | 2020-02-03 17:34:36 -0800 | [diff] [blame] | 1233 | |
| 1234 | /* memory barrier not required, we hold info->lock */ |
| 1235 | WRITE_ONCE(wait.state, STATE_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | ret = wq_sleep(info, RECV, timeout, &wait); |
| 1237 | msg_ptr = wait.msg; |
| 1238 | } |
| 1239 | } else { |
Waiman Long | 194a6b5 | 2016-11-17 11:46:38 -0500 | [diff] [blame] | 1240 | DEFINE_WAKE_Q(wake_q); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | msg_ptr = msg_get(info); |
| 1243 | |
| 1244 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1245 | current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | |
| 1247 | /* There is now free space in queue. */ |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1248 | pipelined_receive(&wake_q, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | spin_unlock(&info->lock); |
Davidlohr Bueso | fa6004a | 2015-05-04 07:02:46 -0700 | [diff] [blame] | 1250 | wake_up_q(&wake_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | ret = 0; |
| 1252 | } |
| 1253 | if (ret == 0) { |
| 1254 | ret = msg_ptr->m_ts; |
| 1255 | |
| 1256 | if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) || |
| 1257 | store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) { |
| 1258 | ret = -EFAULT; |
| 1259 | } |
| 1260 | free_msg(msg_ptr); |
| 1261 | } |
| 1262 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1263 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | out: |
| 1265 | return ret; |
| 1266 | } |
| 1267 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1268 | SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, |
| 1269 | size_t, msg_len, unsigned int, msg_prio, |
Arnd Bergmann | 21fc538 | 2018-04-13 13:58:00 +0200 | [diff] [blame] | 1270 | const struct __kernel_timespec __user *, u_abs_timeout) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1271 | { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1272 | struct timespec64 ts, *p = NULL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1273 | if (u_abs_timeout) { |
| 1274 | int res = prepare_timeout(u_abs_timeout, &ts); |
| 1275 | if (res) |
| 1276 | return res; |
| 1277 | p = &ts; |
| 1278 | } |
| 1279 | return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); |
| 1280 | } |
| 1281 | |
| 1282 | SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, |
| 1283 | size_t, msg_len, unsigned int __user *, u_msg_prio, |
Arnd Bergmann | 21fc538 | 2018-04-13 13:58:00 +0200 | [diff] [blame] | 1284 | const struct __kernel_timespec __user *, u_abs_timeout) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1285 | { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1286 | struct timespec64 ts, *p = NULL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1287 | if (u_abs_timeout) { |
| 1288 | int res = prepare_timeout(u_abs_timeout, &ts); |
| 1289 | if (res) |
| 1290 | return res; |
| 1291 | p = &ts; |
| 1292 | } |
| 1293 | return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); |
| 1294 | } |
| 1295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | /* |
| 1297 | * Notes: the case when user wants us to deregister (with NULL as pointer) |
| 1298 | * and he isn't currently owner of notification, will be silently discarded. |
| 1299 | * It isn't explicitly defined in the POSIX. |
| 1300 | */ |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1301 | static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1303 | int ret; |
| 1304 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | struct sock *sock; |
| 1306 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | struct mqueue_inode_info *info; |
| 1308 | struct sk_buff *nc; |
| 1309 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1310 | audit_mq_notify(mqdes, notification); |
George C. Wilson | 20ca73b | 2006-05-24 16:09:55 -0500 | [diff] [blame] | 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | nc = NULL; |
| 1313 | sock = NULL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1314 | if (notification != NULL) { |
| 1315 | if (unlikely(notification->sigev_notify != SIGEV_NONE && |
| 1316 | notification->sigev_notify != SIGEV_SIGNAL && |
| 1317 | notification->sigev_notify != SIGEV_THREAD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | return -EINVAL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1319 | if (notification->sigev_notify == SIGEV_SIGNAL && |
| 1320 | !valid_signal(notification->sigev_signo)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | return -EINVAL; |
| 1322 | } |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1323 | if (notification->sigev_notify == SIGEV_THREAD) { |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1324 | long timeo; |
| 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | /* create the notify skb */ |
| 1327 | nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL); |
Markus Elfring | c231740 | 2019-09-25 16:48:17 -0700 | [diff] [blame] | 1328 | if (!nc) |
| 1329 | return -ENOMEM; |
| 1330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | if (copy_from_user(nc->data, |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1332 | notification->sigev_value.sival_ptr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | NOTIFY_COOKIE_LEN)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1334 | ret = -EFAULT; |
Markus Elfring | c231740 | 2019-09-25 16:48:17 -0700 | [diff] [blame] | 1335 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | } |
| 1337 | |
| 1338 | /* TODO: add a header? */ |
| 1339 | skb_put(nc, NOTIFY_COOKIE_LEN); |
| 1340 | /* and attach it to the socket */ |
| 1341 | retry: |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1342 | f = fdget(notification->sigev_signo); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1343 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1344 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1346 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1347 | sock = netlink_getsockbyfilp(f.file); |
| 1348 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | if (IS_ERR(sock)) { |
| 1350 | ret = PTR_ERR(sock); |
Markus Elfring | c231740 | 2019-09-25 16:48:17 -0700 | [diff] [blame] | 1351 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | } |
| 1353 | |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1354 | timeo = MAX_SCHEDULE_TIMEOUT; |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1355 | ret = netlink_attachskb(sock, nc, &timeo, NULL); |
Cong Wang | f991af3 | 2017-07-09 13:19:55 -0700 | [diff] [blame] | 1356 | if (ret == 1) { |
| 1357 | sock = NULL; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1358 | goto retry; |
Cong Wang | f991af3 | 2017-07-09 13:19:55 -0700 | [diff] [blame] | 1359 | } |
Markus Elfring | c231740 | 2019-09-25 16:48:17 -0700 | [diff] [blame] | 1360 | if (ret) |
| 1361 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | } |
| 1364 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1365 | f = fdget(mqdes); |
| 1366 | if (!f.file) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1367 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | goto out; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1371 | inode = file_inode(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1372 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1373 | ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | goto out_fput; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | info = MQUEUE_I(inode); |
| 1377 | |
| 1378 | ret = 0; |
| 1379 | spin_lock(&info->lock); |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1380 | if (notification == NULL) { |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1381 | if (info->notify_owner == task_tgid(current)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | remove_notification(info); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1383 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1385 | } else if (info->notify_owner != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | ret = -EBUSY; |
| 1387 | } else { |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1388 | switch (notification->sigev_notify) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | case SIGEV_NONE: |
| 1390 | info->notify.sigev_notify = SIGEV_NONE; |
| 1391 | break; |
| 1392 | case SIGEV_THREAD: |
| 1393 | info->notify_sock = sock; |
| 1394 | info->notify_cookie = nc; |
| 1395 | sock = NULL; |
| 1396 | nc = NULL; |
| 1397 | info->notify.sigev_notify = SIGEV_THREAD; |
| 1398 | break; |
| 1399 | case SIGEV_SIGNAL: |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1400 | info->notify.sigev_signo = notification->sigev_signo; |
| 1401 | info->notify.sigev_value = notification->sigev_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | info->notify.sigev_notify = SIGEV_SIGNAL; |
Oleg Nesterov | b5f2006 | 2020-05-07 18:35:39 -0700 | [diff] [blame] | 1403 | info->notify_self_exec_id = current->self_exec_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | break; |
| 1405 | } |
Cedric Le Goater | a03fcb7 | 2006-10-02 02:17:26 -0700 | [diff] [blame] | 1406 | |
| 1407 | info->notify_owner = get_pid(task_tgid(current)); |
Eric W. Biederman | 6f9ac6d | 2011-11-16 22:57:55 -0800 | [diff] [blame] | 1408 | info->notify_user_ns = get_user_ns(current_user_ns()); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1409 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | } |
| 1411 | spin_unlock(&info->lock); |
| 1412 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1413 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | out: |
Davidlohr Bueso | 3ab08fe | 2014-01-27 17:07:06 -0800 | [diff] [blame] | 1415 | if (sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | netlink_detachskb(sock, nc); |
Markus Elfring | 97b0b1a | 2019-09-25 16:48:14 -0700 | [diff] [blame] | 1417 | else |
Markus Elfring | c231740 | 2019-09-25 16:48:17 -0700 | [diff] [blame] | 1418 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | dev_kfree_skb(nc); |
Davidlohr Bueso | 3ab08fe | 2014-01-27 17:07:06 -0800 | [diff] [blame] | 1420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | return ret; |
| 1422 | } |
| 1423 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1424 | SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
| 1425 | const struct sigevent __user *, u_notification) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | { |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1427 | struct sigevent n, *p = NULL; |
| 1428 | if (u_notification) { |
| 1429 | if (copy_from_user(&n, u_notification, sizeof(struct sigevent))) |
| 1430 | return -EFAULT; |
| 1431 | p = &n; |
| 1432 | } |
| 1433 | return do_mq_notify(mqdes, p); |
| 1434 | } |
| 1435 | |
| 1436 | static int do_mq_getsetattr(int mqdes, struct mq_attr *new, struct mq_attr *old) |
| 1437 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1438 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | struct inode *inode; |
| 1440 | struct mqueue_inode_info *info; |
| 1441 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1442 | if (new && (new->mq_flags & (~O_NONBLOCK))) |
| 1443 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1445 | f = fdget(mqdes); |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1446 | if (!f.file) |
| 1447 | return -EBADF; |
| 1448 | |
| 1449 | if (unlikely(f.file->f_op != &mqueue_file_operations)) { |
| 1450 | fdput(f); |
| 1451 | return -EBADF; |
André Goddard Rosa | 8d8ffef | 2010-02-23 04:04:26 -0300 | [diff] [blame] | 1452 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1454 | inode = file_inode(f.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | info = MQUEUE_I(inode); |
| 1456 | |
| 1457 | spin_lock(&info->lock); |
| 1458 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1459 | if (old) { |
| 1460 | *old = info->attr; |
| 1461 | old->mq_flags = f.file->f_flags & O_NONBLOCK; |
| 1462 | } |
| 1463 | if (new) { |
| 1464 | audit_mq_getsetattr(mqdes, new); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1465 | spin_lock(&f.file->f_lock); |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1466 | if (new->mq_flags & O_NONBLOCK) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1467 | f.file->f_flags |= O_NONBLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | else |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1469 | f.file->f_flags &= ~O_NONBLOCK; |
| 1470 | spin_unlock(&f.file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1472 | inode->i_atime = inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | spin_unlock(&info->lock); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1476 | fdput(f); |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1477 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | } |
| 1479 | |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1480 | SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
| 1481 | const struct mq_attr __user *, u_mqstat, |
| 1482 | struct mq_attr __user *, u_omqstat) |
| 1483 | { |
| 1484 | int ret; |
| 1485 | struct mq_attr mqstat, omqstat; |
| 1486 | struct mq_attr *new = NULL, *old = NULL; |
| 1487 | |
| 1488 | if (u_mqstat) { |
| 1489 | new = &mqstat; |
| 1490 | if (copy_from_user(new, u_mqstat, sizeof(struct mq_attr))) |
| 1491 | return -EFAULT; |
| 1492 | } |
| 1493 | if (u_omqstat) |
| 1494 | old = &omqstat; |
| 1495 | |
| 1496 | ret = do_mq_getsetattr(mqdes, new, old); |
| 1497 | if (ret || !old) |
| 1498 | return ret; |
| 1499 | |
| 1500 | if (copy_to_user(u_omqstat, old, sizeof(struct mq_attr))) |
| 1501 | return -EFAULT; |
| 1502 | return 0; |
| 1503 | } |
| 1504 | |
| 1505 | #ifdef CONFIG_COMPAT |
| 1506 | |
| 1507 | struct compat_mq_attr { |
| 1508 | compat_long_t mq_flags; /* message queue flags */ |
| 1509 | compat_long_t mq_maxmsg; /* maximum number of messages */ |
| 1510 | compat_long_t mq_msgsize; /* maximum message size */ |
| 1511 | compat_long_t mq_curmsgs; /* number of messages currently queued */ |
| 1512 | compat_long_t __reserved[4]; /* ignored for input, zeroed for output */ |
| 1513 | }; |
| 1514 | |
| 1515 | static inline int get_compat_mq_attr(struct mq_attr *attr, |
| 1516 | const struct compat_mq_attr __user *uattr) |
| 1517 | { |
| 1518 | struct compat_mq_attr v; |
| 1519 | |
| 1520 | if (copy_from_user(&v, uattr, sizeof(*uattr))) |
| 1521 | return -EFAULT; |
| 1522 | |
| 1523 | memset(attr, 0, sizeof(*attr)); |
| 1524 | attr->mq_flags = v.mq_flags; |
| 1525 | attr->mq_maxmsg = v.mq_maxmsg; |
| 1526 | attr->mq_msgsize = v.mq_msgsize; |
| 1527 | attr->mq_curmsgs = v.mq_curmsgs; |
| 1528 | return 0; |
| 1529 | } |
| 1530 | |
| 1531 | static inline int put_compat_mq_attr(const struct mq_attr *attr, |
| 1532 | struct compat_mq_attr __user *uattr) |
| 1533 | { |
| 1534 | struct compat_mq_attr v; |
| 1535 | |
| 1536 | memset(&v, 0, sizeof(v)); |
| 1537 | v.mq_flags = attr->mq_flags; |
| 1538 | v.mq_maxmsg = attr->mq_maxmsg; |
| 1539 | v.mq_msgsize = attr->mq_msgsize; |
| 1540 | v.mq_curmsgs = attr->mq_curmsgs; |
| 1541 | if (copy_to_user(uattr, &v, sizeof(*uattr))) |
| 1542 | return -EFAULT; |
| 1543 | return 0; |
| 1544 | } |
| 1545 | |
| 1546 | COMPAT_SYSCALL_DEFINE4(mq_open, const char __user *, u_name, |
| 1547 | int, oflag, compat_mode_t, mode, |
| 1548 | struct compat_mq_attr __user *, u_attr) |
| 1549 | { |
| 1550 | struct mq_attr attr, *p = NULL; |
| 1551 | if (u_attr && oflag & O_CREAT) { |
| 1552 | p = &attr; |
| 1553 | if (get_compat_mq_attr(&attr, u_attr)) |
| 1554 | return -EFAULT; |
| 1555 | } |
| 1556 | return do_mq_open(u_name, oflag, mode, p); |
| 1557 | } |
| 1558 | |
Arnd Bergmann | b0d1757 | 2018-04-13 13:58:23 +0200 | [diff] [blame] | 1559 | COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
| 1560 | const struct compat_sigevent __user *, u_notification) |
| 1561 | { |
| 1562 | struct sigevent n, *p = NULL; |
| 1563 | if (u_notification) { |
| 1564 | if (get_compat_sigevent(&n, u_notification)) |
| 1565 | return -EFAULT; |
| 1566 | if (n.sigev_notify == SIGEV_THREAD) |
| 1567 | n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); |
| 1568 | p = &n; |
| 1569 | } |
| 1570 | return do_mq_notify(mqdes, p); |
| 1571 | } |
| 1572 | |
| 1573 | COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
| 1574 | const struct compat_mq_attr __user *, u_mqstat, |
| 1575 | struct compat_mq_attr __user *, u_omqstat) |
| 1576 | { |
| 1577 | int ret; |
| 1578 | struct mq_attr mqstat, omqstat; |
| 1579 | struct mq_attr *new = NULL, *old = NULL; |
| 1580 | |
| 1581 | if (u_mqstat) { |
| 1582 | new = &mqstat; |
| 1583 | if (get_compat_mq_attr(new, u_mqstat)) |
| 1584 | return -EFAULT; |
| 1585 | } |
| 1586 | if (u_omqstat) |
| 1587 | old = &omqstat; |
| 1588 | |
| 1589 | ret = do_mq_getsetattr(mqdes, new, old); |
| 1590 | if (ret || !old) |
| 1591 | return ret; |
| 1592 | |
| 1593 | if (put_compat_mq_attr(old, u_omqstat)) |
| 1594 | return -EFAULT; |
| 1595 | return 0; |
| 1596 | } |
| 1597 | #endif |
| 1598 | |
| 1599 | #ifdef CONFIG_COMPAT_32BIT_TIME |
Arnd Bergmann | 9afc5ee | 2018-07-13 12:52:28 +0200 | [diff] [blame] | 1600 | static int compat_prepare_timeout(const struct old_timespec32 __user *p, |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1601 | struct timespec64 *ts) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1602 | { |
Arnd Bergmann | 9afc5ee | 2018-07-13 12:52:28 +0200 | [diff] [blame] | 1603 | if (get_old_timespec32(ts, p)) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1604 | return -EFAULT; |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1605 | if (!timespec64_valid(ts)) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1606 | return -EINVAL; |
| 1607 | return 0; |
| 1608 | } |
| 1609 | |
Arnd Bergmann | 8dabe72 | 2019-01-07 00:33:08 +0100 | [diff] [blame] | 1610 | SYSCALL_DEFINE5(mq_timedsend_time32, mqd_t, mqdes, |
| 1611 | const char __user *, u_msg_ptr, |
| 1612 | unsigned int, msg_len, unsigned int, msg_prio, |
| 1613 | const struct old_timespec32 __user *, u_abs_timeout) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1614 | { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1615 | struct timespec64 ts, *p = NULL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1616 | if (u_abs_timeout) { |
| 1617 | int res = compat_prepare_timeout(u_abs_timeout, &ts); |
| 1618 | if (res) |
| 1619 | return res; |
| 1620 | p = &ts; |
| 1621 | } |
| 1622 | return do_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, p); |
| 1623 | } |
| 1624 | |
Arnd Bergmann | 8dabe72 | 2019-01-07 00:33:08 +0100 | [diff] [blame] | 1625 | SYSCALL_DEFINE5(mq_timedreceive_time32, mqd_t, mqdes, |
| 1626 | char __user *, u_msg_ptr, |
| 1627 | unsigned int, msg_len, unsigned int __user *, u_msg_prio, |
| 1628 | const struct old_timespec32 __user *, u_abs_timeout) |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1629 | { |
Deepa Dinamani | b904772 | 2017-08-02 19:51:11 -0700 | [diff] [blame] | 1630 | struct timespec64 ts, *p = NULL; |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1631 | if (u_abs_timeout) { |
| 1632 | int res = compat_prepare_timeout(u_abs_timeout, &ts); |
| 1633 | if (res) |
| 1634 | return res; |
| 1635 | p = &ts; |
| 1636 | } |
| 1637 | return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); |
| 1638 | } |
Al Viro | 0d06060 | 2017-06-27 21:32:36 -0400 | [diff] [blame] | 1639 | #endif |
| 1640 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 1641 | static const struct inode_operations mqueue_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | .lookup = simple_lookup, |
| 1643 | .create = mqueue_create, |
| 1644 | .unlink = mqueue_unlink, |
| 1645 | }; |
| 1646 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 1647 | static const struct file_operations mqueue_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | .flush = mqueue_flush_file, |
| 1649 | .poll = mqueue_poll_file, |
| 1650 | .read = mqueue_read_file, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1651 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | }; |
| 1653 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1654 | static const struct super_operations mqueue_super_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | .alloc_inode = mqueue_alloc_inode, |
Al Viro | 015d795 | 2019-04-15 22:30:30 -0400 | [diff] [blame] | 1656 | .free_inode = mqueue_free_inode, |
Al Viro | 6d8af64 | 2010-06-05 16:29:45 -0400 | [diff] [blame] | 1657 | .evict_inode = mqueue_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | .statfs = simple_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | }; |
| 1660 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 1661 | static const struct fs_context_operations mqueue_fs_context_ops = { |
| 1662 | .free = mqueue_fs_context_free, |
| 1663 | .get_tree = mqueue_get_tree, |
| 1664 | }; |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | static struct file_system_type mqueue_fs_type = { |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 1667 | .name = "mqueue", |
| 1668 | .init_fs_context = mqueue_init_fs_context, |
| 1669 | .kill_sb = kill_litter_super, |
| 1670 | .fs_flags = FS_USERNS_MOUNT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | }; |
| 1672 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1673 | int mq_init_ns(struct ipc_namespace *ns) |
| 1674 | { |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 1675 | struct vfsmount *m; |
| 1676 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1677 | ns->mq_queues_count = 0; |
| 1678 | ns->mq_queues_max = DFLT_QUEUESMAX; |
| 1679 | ns->mq_msg_max = DFLT_MSGMAX; |
| 1680 | ns->mq_msgsize_max = DFLT_MSGSIZEMAX; |
KOSAKI Motohiro | cef0184 | 2012-05-31 16:26:33 -0700 | [diff] [blame] | 1681 | ns->mq_msg_default = DFLT_MSG; |
| 1682 | ns->mq_msgsize_default = DFLT_MSGSIZE; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1683 | |
David Howells | 935c6912 | 2018-11-01 23:07:25 +0000 | [diff] [blame] | 1684 | m = mq_create_mount(ns); |
| 1685 | if (IS_ERR(m)) |
| 1686 | return PTR_ERR(m); |
| 1687 | ns->mq_mnt = m; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1688 | return 0; |
| 1689 | } |
| 1690 | |
| 1691 | void mq_clear_sbinfo(struct ipc_namespace *ns) |
| 1692 | { |
Eric W. Biederman | cfb2f6f | 2018-03-24 11:28:14 -0500 | [diff] [blame] | 1693 | ns->mq_mnt->mnt_sb->s_fs_info = NULL; |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1694 | } |
| 1695 | |
| 1696 | void mq_put_mnt(struct ipc_namespace *ns) |
| 1697 | { |
Eric W. Biederman | cfb2f6f | 2018-03-24 11:28:14 -0500 | [diff] [blame] | 1698 | kern_unmount(ns->mq_mnt); |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1699 | } |
| 1700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | static int __init init_mqueue_fs(void) |
| 1702 | { |
| 1703 | int error; |
| 1704 | |
| 1705 | mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache", |
| 1706 | sizeof(struct mqueue_inode_info), 0, |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 1707 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | if (mqueue_inode_cachep == NULL) |
| 1709 | return -ENOMEM; |
| 1710 | |
André Goddard Rosa | 2329e392 | 2010-02-23 04:04:27 -0300 | [diff] [blame] | 1711 | /* ignore failures - they are not fatal */ |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 1712 | mq_sysctl_table = mq_register_sysctl_table(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
| 1714 | error = register_filesystem(&mqueue_fs_type); |
| 1715 | if (error) |
| 1716 | goto out_sysctl; |
| 1717 | |
Serge E. Hallyn | 7eafd7c | 2009-04-06 19:01:10 -0700 | [diff] [blame] | 1718 | spin_lock_init(&mq_lock); |
| 1719 | |
Al Viro | 6f68657 | 2011-12-09 00:38:50 -0500 | [diff] [blame] | 1720 | error = mq_init_ns(&init_ipc_ns); |
| 1721 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | goto out_filesystem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | return 0; |
| 1725 | |
| 1726 | out_filesystem: |
| 1727 | unregister_filesystem(&mqueue_fs_type); |
| 1728 | out_sysctl: |
| 1729 | if (mq_sysctl_table) |
| 1730 | unregister_sysctl_table(mq_sysctl_table); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1731 | kmem_cache_destroy(mqueue_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | return error; |
| 1733 | } |
| 1734 | |
Davidlohr Bueso | 6d08a25 | 2014-04-07 15:39:18 -0700 | [diff] [blame] | 1735 | device_initcall(init_mqueue_fs); |