Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/ipc/msg.c |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 3 | * Copyright (C) 1992 Krishna Balasubramanian |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Removed all the remaining kerneld mess |
| 6 | * Catch the -EFAULT stuff properly |
| 7 | * Use GFP_KERNEL for messages as in 1.2 |
| 8 | * Fixed up the unchecked user space derefs |
| 9 | * Copyright (C) 1998 Alan Cox & Andi Kleen |
| 10 | * |
| 11 | * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com> |
| 12 | * |
| 13 | * mostly rewritten, threaded and wake-one semantics added |
| 14 | * MSGMAX limit removed, sysctl's added |
Christian Kujau | 624dffc | 2006-01-15 02:43:54 +0100 | [diff] [blame] | 15 | * (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
Steve Grubb | 073115d | 2006-04-02 17:07:33 -0400 | [diff] [blame] | 16 | * |
| 17 | * support for audit of ipc object properties and permission changes |
| 18 | * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 19 | * |
| 20 | * namespaces support |
| 21 | * OpenVZ, SWsoft Inc. |
| 22 | * Pavel Emelianov <xemul@openvz.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 25 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/msg.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/init.h> |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 29 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/proc_fs.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <linux/security.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/syscalls.h> |
| 35 | #include <linux/audit.h> |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 36 | #include <linux/seq_file.h> |
Nadia Derbey | 3e148c7 | 2007-10-18 23:40:54 -0700 | [diff] [blame] | 37 | #include <linux/rwsem.h> |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 38 | #include <linux/nsproxy.h> |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 39 | #include <linux/ipc_namespace.h> |
Ingo Molnar | 5f921ae | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/current.h> |
| 42 | #include <asm/uaccess.h> |
| 43 | #include "util.h" |
| 44 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 45 | /* |
| 46 | * one msg_receiver structure for each sleeping receiver: |
| 47 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | struct msg_receiver { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 49 | struct list_head r_list; |
| 50 | struct task_struct *r_tsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 52 | int r_mode; |
| 53 | long r_msgtype; |
| 54 | long r_maxsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | 80491eb | 2006-11-04 09:55:00 -0800 | [diff] [blame] | 56 | struct msg_msg *volatile r_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | /* one msg_sender for each sleeping sender */ |
| 60 | struct msg_sender { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 61 | struct list_head list; |
| 62 | struct task_struct *tsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | #define SEARCH_ANY 1 |
| 66 | #define SEARCH_EQUAL 2 |
| 67 | #define SEARCH_NOTEQUAL 3 |
| 68 | #define SEARCH_LESSEQUAL 4 |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 69 | #define SEARCH_NUMBER 5 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Pierre Peiffer | ed2ddbf | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 71 | #define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 72 | |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 73 | static void freeque(struct ipc_namespace *, struct kern_ipc_perm *); |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 74 | static int newque(struct ipc_namespace *, struct ipc_params *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #ifdef CONFIG_PROC_FS |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 76 | static int sysvipc_msg_proc_show(struct seq_file *s, void *it); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #endif |
| 78 | |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 79 | /* |
| 80 | * Scale msgmni with the available lowmem size: the memory dedicated to msg |
| 81 | * queues should occupy at most 1/MSG_MEM_SCALE of lowmem. |
Nadia Derbey | 4d89dc6 | 2008-04-29 01:00:40 -0700 | [diff] [blame] | 82 | * Also take into account the number of nsproxies created so far. |
| 83 | * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range. |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 84 | */ |
Nadia Derbey | b6b337a | 2008-04-29 01:00:42 -0700 | [diff] [blame] | 85 | void recompute_msgmni(struct ipc_namespace *ns) |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 86 | { |
| 87 | struct sysinfo i; |
| 88 | unsigned long allowed; |
Nadia Derbey | 4d89dc6 | 2008-04-29 01:00:40 -0700 | [diff] [blame] | 89 | int nb_ns; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 90 | |
| 91 | si_meminfo(&i); |
| 92 | allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit) |
| 93 | / MSGMNB; |
Nadia Derbey | 4d89dc6 | 2008-04-29 01:00:40 -0700 | [diff] [blame] | 94 | nb_ns = atomic_read(&nr_ipc_ns); |
| 95 | allowed /= nb_ns; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 96 | |
| 97 | if (allowed < MSGMNI) { |
| 98 | ns->msg_ctlmni = MSGMNI; |
Nadia Derbey | dfcceb2 | 2008-06-05 22:46:38 -0700 | [diff] [blame] | 99 | return; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Nadia Derbey | 4d89dc6 | 2008-04-29 01:00:40 -0700 | [diff] [blame] | 102 | if (allowed > IPCMNI / nb_ns) { |
| 103 | ns->msg_ctlmni = IPCMNI / nb_ns; |
Nadia Derbey | dfcceb2 | 2008-06-05 22:46:38 -0700 | [diff] [blame] | 104 | return; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | ns->msg_ctlmni = allowed; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Pierre Peiffer | ed2ddbf | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 110 | void msg_init_ns(struct ipc_namespace *ns) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 112 | ns->msg_ctlmax = MSGMAX; |
| 113 | ns->msg_ctlmnb = MSGMNB; |
Nadia Derbey | f7bf3df | 2008-04-29 01:00:39 -0700 | [diff] [blame] | 114 | |
| 115 | recompute_msgmni(ns); |
| 116 | |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 117 | atomic_set(&ns->msg_bytes, 0); |
| 118 | atomic_set(&ns->msg_hdrs, 0); |
Pierre Peiffer | ed2ddbf | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 119 | ipc_init_ids(&ns->ids[IPC_MSG_IDS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 122 | #ifdef CONFIG_IPC_NS |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 123 | void msg_exit_ns(struct ipc_namespace *ns) |
| 124 | { |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 125 | free_ipcs(ns, &msg_ids(ns), freeque); |
Serge E. Hallyn | 7d6feeb | 2009-12-15 16:47:27 -0800 | [diff] [blame] | 126 | idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr); |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 127 | } |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 128 | #endif |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 129 | |
| 130 | void __init msg_init(void) |
| 131 | { |
Pierre Peiffer | ed2ddbf | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 132 | msg_init_ns(&init_ipc_ns); |
Nadia Derbey | dfcceb2 | 2008-06-05 22:46:38 -0700 | [diff] [blame] | 133 | |
| 134 | printk(KERN_INFO "msgmni has been set to %d\n", |
| 135 | init_ipc_ns.msg_ctlmni); |
| 136 | |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 137 | ipc_init_proc_interface("sysvipc/msg", |
| 138 | " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n", |
| 139 | IPC_MSG_IDS, sysvipc_msg_proc_show); |
| 140 | } |
| 141 | |
Davidlohr Bueso | a5001a0 | 2013-07-08 16:01:15 -0700 | [diff] [blame] | 142 | static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id) |
| 143 | { |
| 144 | struct kern_ipc_perm *ipcp = ipc_obtain_object(&msg_ids(ns), id); |
| 145 | |
| 146 | if (IS_ERR(ipcp)) |
| 147 | return ERR_CAST(ipcp); |
| 148 | |
| 149 | return container_of(ipcp, struct msg_queue, q_perm); |
| 150 | } |
| 151 | |
| 152 | static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns, |
| 153 | int id) |
| 154 | { |
| 155 | struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id); |
| 156 | |
| 157 | if (IS_ERR(ipcp)) |
| 158 | return ERR_CAST(ipcp); |
| 159 | |
| 160 | return container_of(ipcp, struct msg_queue, q_perm); |
| 161 | } |
| 162 | |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 163 | static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) |
| 164 | { |
| 165 | ipc_rmid(&msg_ids(ns), &s->q_perm); |
| 166 | } |
| 167 | |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 168 | static void msg_rcu_free(struct rcu_head *head) |
| 169 | { |
| 170 | struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu); |
| 171 | struct msg_queue *msq = ipc_rcu_to_struct(p); |
| 172 | |
| 173 | security_msg_queue_free(msq); |
| 174 | ipc_rcu_free(head); |
| 175 | } |
| 176 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 177 | /** |
| 178 | * newque - Create a new msg queue |
| 179 | * @ns: namespace |
| 180 | * @params: ptr to the structure that contains the key and msgflg |
| 181 | * |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 182 | * Called with msg_ids.rwsem held (writer) |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 183 | */ |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 184 | static int newque(struct ipc_namespace *ns, struct ipc_params *params) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct msg_queue *msq; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 187 | int id, retval; |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 188 | key_t key = params->key; |
| 189 | int msgflg = params->flg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 191 | msq = ipc_rcu_alloc(sizeof(*msq)); |
| 192 | if (!msq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | return -ENOMEM; |
| 194 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 195 | msq->q_perm.mode = msgflg & S_IRWXUGO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | msq->q_perm.key = key; |
| 197 | |
| 198 | msq->q_perm.security = NULL; |
| 199 | retval = security_msg_queue_alloc(msq); |
| 200 | if (retval) { |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 201 | ipc_rcu_putref(msq, ipc_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return retval; |
| 203 | } |
| 204 | |
Davidlohr Bueso | dbfcd91 | 2013-07-08 16:01:09 -0700 | [diff] [blame] | 205 | /* ipc_addid() locks msq upon success. */ |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 206 | id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); |
Pierre Peiffer | 283bb7f | 2007-10-18 23:40:57 -0700 | [diff] [blame] | 207 | if (id < 0) { |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 208 | ipc_rcu_putref(msq, msg_rcu_free); |
Pierre Peiffer | 283bb7f | 2007-10-18 23:40:57 -0700 | [diff] [blame] | 209 | return id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | msq->q_stime = msq->q_rtime = 0; |
| 213 | msq->q_ctime = get_seconds(); |
| 214 | msq->q_cbytes = msq->q_qnum = 0; |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 215 | msq->q_qbytes = ns->msg_ctlmnb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | msq->q_lspid = msq->q_lrpid = 0; |
| 217 | INIT_LIST_HEAD(&msq->q_messages); |
| 218 | INIT_LIST_HEAD(&msq->q_receivers); |
| 219 | INIT_LIST_HEAD(&msq->q_senders); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 220 | |
Davidlohr Bueso | cf9d5d7 | 2013-07-08 16:01:11 -0700 | [diff] [blame] | 221 | ipc_unlock_object(&msq->q_perm); |
Davidlohr Bueso | dbfcd91 | 2013-07-08 16:01:09 -0700 | [diff] [blame] | 222 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 224 | return msq->q_perm.id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 227 | static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 229 | mss->tsk = current; |
| 230 | current->state = TASK_INTERRUPTIBLE; |
| 231 | list_add_tail(&mss->list, &msq->q_senders); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 234 | static inline void ss_del(struct msg_sender *mss) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 236 | if (mss->list.next != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | list_del(&mss->list); |
| 238 | } |
| 239 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 240 | static void ss_wakeup(struct list_head *h, int kill) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 242 | struct msg_sender *mss, *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 244 | list_for_each_entry_safe(mss, t, h, list) { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 245 | if (kill) |
| 246 | mss->list.next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | wake_up_process(mss->tsk); |
| 248 | } |
| 249 | } |
| 250 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 251 | static void expunge_all(struct msg_queue *msq, int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | { |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 253 | struct msg_receiver *msr, *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 255 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 256 | msr->r_msg = NULL; /* initialize expunge ordering */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | wake_up_process(msr->r_tsk); |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 258 | /* |
| 259 | * Ensure that the wakeup is visible before setting r_msg as |
| 260 | * the receiving end depends on it: either spinning on a nil, |
| 261 | * or dealing with -EAGAIN cases. See lockless receive part 1 |
| 262 | * and 2 in do_msgrcv(). |
| 263 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | smp_mb(); |
| 265 | msr->r_msg = ERR_PTR(res); |
| 266 | } |
| 267 | } |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 268 | |
| 269 | /* |
| 270 | * freeque() wakes up waiters on the sender and receiver waiting queue, |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 271 | * removes the message queue from message queue ID IDR, and cleans up all the |
| 272 | * messages associated with this queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | * |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 274 | * msg_ids.rwsem (writer) and the spinlock for this message queue are held |
| 275 | * before freeque() is called. msg_ids.rwsem remains locked on exit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | */ |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 277 | static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 279 | struct msg_msg *msg, *t; |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 280 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 282 | expunge_all(msq, -EIDRM); |
| 283 | ss_wakeup(&msq->q_senders, 1); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 284 | msg_rmid(ns, msq); |
Davidlohr Bueso | 4718787 | 2013-09-11 14:26:25 -0700 | [diff] [blame] | 285 | ipc_unlock_object(&msq->q_perm); |
| 286 | rcu_read_unlock(); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 287 | |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 288 | list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 289 | atomic_dec(&ns->msg_hdrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | free_msg(msg); |
| 291 | } |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 292 | atomic_sub(msq->q_cbytes, &ns->msg_bytes); |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 293 | ipc_rcu_putref(msq, msg_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 296 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 297 | * Called with msg_ids.rwsem and ipcp locked. |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 298 | */ |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 299 | static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg) |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 300 | { |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 301 | struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
| 302 | |
| 303 | return security_msg_queue_associate(msq, msgflg); |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 306 | SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | { |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 308 | struct ipc_namespace *ns; |
Mathias Krause | eb66ec4 | 2014-06-06 14:37:36 -0700 | [diff] [blame^] | 309 | static const struct ipc_ops msg_ops = { |
| 310 | .getnew = newque, |
| 311 | .associate = msg_security, |
| 312 | }; |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 313 | struct ipc_params msg_params; |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 314 | |
| 315 | ns = current->nsproxy->ipc_ns; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 316 | |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 317 | msg_params.key = key; |
| 318 | msg_params.flg = msgflg; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 319 | |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 320 | return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 323 | static inline unsigned long |
| 324 | copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 326 | switch (version) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | case IPC_64: |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 328 | return copy_to_user(buf, in, sizeof(*in)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | case IPC_OLD: |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 330 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct msqid_ds out; |
| 332 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 333 | memset(&out, 0, sizeof(out)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm); |
| 336 | |
| 337 | out.msg_stime = in->msg_stime; |
| 338 | out.msg_rtime = in->msg_rtime; |
| 339 | out.msg_ctime = in->msg_ctime; |
| 340 | |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 341 | if (in->msg_cbytes > USHRT_MAX) |
| 342 | out.msg_cbytes = USHRT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | else |
| 344 | out.msg_cbytes = in->msg_cbytes; |
| 345 | out.msg_lcbytes = in->msg_cbytes; |
| 346 | |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 347 | if (in->msg_qnum > USHRT_MAX) |
| 348 | out.msg_qnum = USHRT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | else |
| 350 | out.msg_qnum = in->msg_qnum; |
| 351 | |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 352 | if (in->msg_qbytes > USHRT_MAX) |
| 353 | out.msg_qbytes = USHRT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | else |
| 355 | out.msg_qbytes = in->msg_qbytes; |
| 356 | out.msg_lqbytes = in->msg_qbytes; |
| 357 | |
| 358 | out.msg_lspid = in->msg_lspid; |
| 359 | out.msg_lrpid = in->msg_lrpid; |
| 360 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 361 | return copy_to_user(buf, &out, sizeof(out)); |
| 362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | default: |
| 364 | return -EINVAL; |
| 365 | } |
| 366 | } |
| 367 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 368 | static inline unsigned long |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 369 | copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 371 | switch (version) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | case IPC_64: |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 373 | if (copy_from_user(out, buf, sizeof(*out))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | case IPC_OLD: |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 377 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | struct msqid_ds tbuf_old; |
| 379 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 380 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | return -EFAULT; |
| 382 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 383 | out->msg_perm.uid = tbuf_old.msg_perm.uid; |
| 384 | out->msg_perm.gid = tbuf_old.msg_perm.gid; |
| 385 | out->msg_perm.mode = tbuf_old.msg_perm.mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 387 | if (tbuf_old.msg_qbytes == 0) |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 388 | out->msg_qbytes = tbuf_old.msg_lqbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | else |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 390 | out->msg_qbytes = tbuf_old.msg_qbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | return 0; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 393 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | default: |
| 395 | return -EINVAL; |
| 396 | } |
| 397 | } |
| 398 | |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 399 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 400 | * This function handles some msgctl commands which require the rwsem |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 401 | * to be held in write mode. |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 402 | * NOTE: no locks must be held, the rwsem is taken inside this function. |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 403 | */ |
| 404 | static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, |
| 405 | struct msqid_ds __user *buf, int version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | struct kern_ipc_perm *ipcp; |
Felipe Contreras | f1970c4 | 2009-10-19 01:54:29 +0300 | [diff] [blame] | 408 | struct msqid64_ds uninitialized_var(msqid64); |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 409 | struct msg_queue *msq; |
| 410 | int err; |
| 411 | |
| 412 | if (cmd == IPC_SET) { |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 413 | if (copy_msqid_from_user(&msqid64, buf, version)) |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 414 | return -EFAULT; |
| 415 | } |
| 416 | |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 417 | down_write(&msg_ids(ns).rwsem); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 418 | rcu_read_lock(); |
| 419 | |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 420 | ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd, |
| 421 | &msqid64.msg_perm, msqid64.msg_qbytes); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 422 | if (IS_ERR(ipcp)) { |
| 423 | err = PTR_ERR(ipcp); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 424 | goto out_unlock1; |
| 425 | } |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 426 | |
Pierre Peiffer | a5f75e7 | 2008-04-29 01:00:54 -0700 | [diff] [blame] | 427 | msq = container_of(ipcp, struct msg_queue, q_perm); |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 428 | |
| 429 | err = security_msg_queue_msgctl(msq, cmd); |
| 430 | if (err) |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 431 | goto out_unlock1; |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 432 | |
| 433 | switch (cmd) { |
| 434 | case IPC_RMID: |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 435 | ipc_lock_object(&msq->q_perm); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 436 | /* freeque unlocks the ipc object and rcu */ |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 437 | freeque(ns, ipcp); |
| 438 | goto out_up; |
| 439 | case IPC_SET: |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 440 | if (msqid64.msg_qbytes > ns->msg_ctlmnb && |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 441 | !capable(CAP_SYS_RESOURCE)) { |
| 442 | err = -EPERM; |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 443 | goto out_unlock1; |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 446 | ipc_lock_object(&msq->q_perm); |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 447 | err = ipc_update_perm(&msqid64.msg_perm, ipcp); |
| 448 | if (err) |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 449 | goto out_unlock0; |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 450 | |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 451 | msq->q_qbytes = msqid64.msg_qbytes; |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 452 | |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 453 | msq->q_ctime = get_seconds(); |
| 454 | /* sleeping receivers might be excluded by |
| 455 | * stricter permissions. |
| 456 | */ |
| 457 | expunge_all(msq, -EAGAIN); |
| 458 | /* sleeping senders might be able to send |
| 459 | * due to a larger queue size. |
| 460 | */ |
| 461 | ss_wakeup(&msq->q_senders, 0); |
| 462 | break; |
| 463 | default: |
| 464 | err = -EINVAL; |
Davidlohr Bueso | 15724ec | 2013-07-08 16:01:13 -0700 | [diff] [blame] | 465 | goto out_unlock1; |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 466 | } |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 467 | |
| 468 | out_unlock0: |
| 469 | ipc_unlock_object(&msq->q_perm); |
| 470 | out_unlock1: |
| 471 | rcu_read_unlock(); |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 472 | out_up: |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 473 | up_write(&msg_ids(ns).rwsem); |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 474 | return err; |
| 475 | } |
| 476 | |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 477 | static int msgctl_nolock(struct ipc_namespace *ns, int msqid, |
| 478 | int cmd, int version, void __user *buf) |
Pierre Peiffer | a0d092f | 2008-04-29 01:00:48 -0700 | [diff] [blame] | 479 | { |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 480 | int err; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 481 | struct msg_queue *msq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | switch (cmd) { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 484 | case IPC_INFO: |
| 485 | case MSG_INFO: |
| 486 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | struct msginfo msginfo; |
| 488 | int max_id; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | if (!buf) |
| 491 | return -EFAULT; |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 492 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 493 | /* |
| 494 | * We must not return kernel stack data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | * due to padding, it's not enough |
| 496 | * to set all member fields. |
| 497 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | err = security_msg_queue_msgctl(NULL, cmd); |
| 499 | if (err) |
| 500 | return err; |
| 501 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 502 | memset(&msginfo, 0, sizeof(msginfo)); |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 503 | msginfo.msgmni = ns->msg_ctlmni; |
| 504 | msginfo.msgmax = ns->msg_ctlmax; |
| 505 | msginfo.msgmnb = ns->msg_ctlmnb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | msginfo.msgssz = MSGSSZ; |
| 507 | msginfo.msgseg = MSGSEG; |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 508 | down_read(&msg_ids(ns).rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (cmd == MSG_INFO) { |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 510 | msginfo.msgpool = msg_ids(ns).in_use; |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 511 | msginfo.msgmap = atomic_read(&ns->msg_hdrs); |
| 512 | msginfo.msgtql = atomic_read(&ns->msg_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } else { |
| 514 | msginfo.msgmap = MSGMAP; |
| 515 | msginfo.msgpool = MSGPOOL; |
| 516 | msginfo.msgtql = MSGTQL; |
| 517 | } |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 518 | max_id = ipc_get_maxid(&msg_ids(ns)); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 519 | up_read(&msg_ids(ns).rwsem); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 520 | if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | return -EFAULT; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 522 | return (max_id < 0) ? 0 : max_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 524 | |
| 525 | case MSG_STAT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | case IPC_STAT: |
| 527 | { |
| 528 | struct msqid64_ds tbuf; |
| 529 | int success_return; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | if (!buf) |
| 532 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 534 | memset(&tbuf, 0, sizeof(tbuf)); |
| 535 | |
| 536 | rcu_read_lock(); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 537 | if (cmd == MSG_STAT) { |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 538 | msq = msq_obtain_object(ns, msqid); |
| 539 | if (IS_ERR(msq)) { |
| 540 | err = PTR_ERR(msq); |
| 541 | goto out_unlock; |
| 542 | } |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 543 | success_return = msq->q_perm.id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } else { |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 545 | msq = msq_obtain_object_check(ns, msqid); |
| 546 | if (IS_ERR(msq)) { |
| 547 | err = PTR_ERR(msq); |
| 548 | goto out_unlock; |
| 549 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | success_return = 0; |
| 551 | } |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | err = -EACCES; |
Serge E. Hallyn | b0e7759 | 2011-03-23 16:43:24 -0700 | [diff] [blame] | 554 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | goto out_unlock; |
| 556 | |
| 557 | err = security_msg_queue_msgctl(msq, cmd); |
| 558 | if (err) |
| 559 | goto out_unlock; |
| 560 | |
| 561 | kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm); |
| 562 | tbuf.msg_stime = msq->q_stime; |
| 563 | tbuf.msg_rtime = msq->q_rtime; |
| 564 | tbuf.msg_ctime = msq->q_ctime; |
| 565 | tbuf.msg_cbytes = msq->q_cbytes; |
| 566 | tbuf.msg_qnum = msq->q_qnum; |
| 567 | tbuf.msg_qbytes = msq->q_qbytes; |
| 568 | tbuf.msg_lspid = msq->q_lspid; |
| 569 | tbuf.msg_lrpid = msq->q_lrpid; |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 570 | rcu_read_unlock(); |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (copy_msqid_to_user(buf, &tbuf, version)) |
| 573 | return -EFAULT; |
| 574 | return success_return; |
| 575 | } |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | default: |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 578 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 581 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | out_unlock: |
Davidlohr Bueso | ac0ba20 | 2013-07-08 16:01:16 -0700 | [diff] [blame] | 583 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return err; |
| 585 | } |
| 586 | |
Davidlohr Bueso | 2cafed3 | 2013-07-08 16:01:14 -0700 | [diff] [blame] | 587 | SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) |
| 588 | { |
| 589 | int version; |
| 590 | struct ipc_namespace *ns; |
| 591 | |
| 592 | if (msqid < 0 || cmd < 0) |
| 593 | return -EINVAL; |
| 594 | |
| 595 | version = ipc_parse_version(&cmd); |
| 596 | ns = current->nsproxy->ipc_ns; |
| 597 | |
| 598 | switch (cmd) { |
| 599 | case IPC_INFO: |
| 600 | case MSG_INFO: |
| 601 | case MSG_STAT: /* msqid is an index rather than a msg queue id */ |
| 602 | case IPC_STAT: |
| 603 | return msgctl_nolock(ns, msqid, cmd, version, buf); |
| 604 | case IPC_SET: |
| 605 | case IPC_RMID: |
| 606 | return msgctl_down(ns, msqid, cmd, buf, version); |
| 607 | default: |
| 608 | return -EINVAL; |
| 609 | } |
| 610 | } |
| 611 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 612 | static int testmsg(struct msg_msg *msg, long type, int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 614 | switch (mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | { |
| 616 | case SEARCH_ANY: |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 617 | case SEARCH_NUMBER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | return 1; |
| 619 | case SEARCH_LESSEQUAL: |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 620 | if (msg->m_type <= type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return 1; |
| 622 | break; |
| 623 | case SEARCH_EQUAL: |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 624 | if (msg->m_type == type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | return 1; |
| 626 | break; |
| 627 | case SEARCH_NOTEQUAL: |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 628 | if (msg->m_type != type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | return 1; |
| 630 | break; |
| 631 | } |
| 632 | return 0; |
| 633 | } |
| 634 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 635 | static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | { |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 637 | struct msg_receiver *msr, *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Nikola Pajkovsky | 41239fe | 2013-04-30 19:15:49 -0700 | [diff] [blame] | 639 | list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 640 | if (testmsg(msg, msr->r_msgtype, msr->r_mode) && |
| 641 | !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, |
| 642 | msr->r_msgtype, msr->r_mode)) { |
| 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | list_del(&msr->r_list); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 645 | if (msr->r_maxsize < msg->m_ts) { |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 646 | /* initialize pipelined send ordering */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | msr->r_msg = NULL; |
| 648 | wake_up_process(msr->r_tsk); |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 649 | smp_mb(); /* see barrier comment below */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | msr->r_msg = ERR_PTR(-E2BIG); |
| 651 | } else { |
| 652 | msr->r_msg = NULL; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 653 | msq->q_lrpid = task_pid_vnr(msr->r_tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | msq->q_rtime = get_seconds(); |
| 655 | wake_up_process(msr->r_tsk); |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 656 | /* |
| 657 | * Ensure that the wakeup is visible before |
| 658 | * setting r_msg, as the receiving end depends |
| 659 | * on it. See lockless receive part 1 and 2 in |
| 660 | * do_msgrcv(). |
| 661 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | smp_mb(); |
| 663 | msr->r_msg = msg; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return 1; |
| 666 | } |
| 667 | } |
| 668 | } |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | return 0; |
| 671 | } |
| 672 | |
suzuki | 651971c | 2006-12-06 20:37:48 -0800 | [diff] [blame] | 673 | long do_msgsnd(int msqid, long mtype, void __user *mtext, |
| 674 | size_t msgsz, int msgflg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
| 676 | struct msg_queue *msq; |
| 677 | struct msg_msg *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | int err; |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 679 | struct ipc_namespace *ns; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 680 | |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 681 | ns = current->nsproxy->ipc_ns; |
| 682 | |
| 683 | if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | if (mtype < 1) |
| 686 | return -EINVAL; |
| 687 | |
suzuki | 651971c | 2006-12-06 20:37:48 -0800 | [diff] [blame] | 688 | msg = load_msg(mtext, msgsz); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 689 | if (IS_ERR(msg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return PTR_ERR(msg); |
| 691 | |
| 692 | msg->m_type = mtype; |
| 693 | msg->m_ts = msgsz; |
| 694 | |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 695 | rcu_read_lock(); |
| 696 | msq = msq_obtain_object_check(ns, msqid); |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 697 | if (IS_ERR(msq)) { |
| 698 | err = PTR_ERR(msq); |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 699 | goto out_unlock1; |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 700 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Manfred Spraul | bebcb92 | 2013-09-03 16:00:08 +0200 | [diff] [blame] | 702 | ipc_lock_object(&msq->q_perm); |
| 703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | for (;;) { |
| 705 | struct msg_sender s; |
| 706 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 707 | err = -EACCES; |
Serge E. Hallyn | b0e7759 | 2011-03-23 16:43:24 -0700 | [diff] [blame] | 708 | if (ipcperms(ns, &msq->q_perm, S_IWUGO)) |
Manfred Spraul | bebcb92 | 2013-09-03 16:00:08 +0200 | [diff] [blame] | 709 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Davidlohr Bueso | 4271b05 | 2013-09-30 13:45:26 -0700 | [diff] [blame] | 711 | /* raced with RMID? */ |
Rafael Aquini | 0f3d2b0 | 2014-01-27 17:07:01 -0800 | [diff] [blame] | 712 | if (!ipc_valid_object(&msq->q_perm)) { |
Davidlohr Bueso | 4271b05 | 2013-09-30 13:45:26 -0700 | [diff] [blame] | 713 | err = -EIDRM; |
| 714 | goto out_unlock0; |
| 715 | } |
| 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | err = security_msg_queue_msgsnd(msq, msg, msgflg); |
| 718 | if (err) |
Manfred Spraul | bebcb92 | 2013-09-03 16:00:08 +0200 | [diff] [blame] | 719 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 721 | if (msgsz + msq->q_cbytes <= msq->q_qbytes && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | 1 + msq->q_qnum <= msq->q_qbytes) { |
| 723 | break; |
| 724 | } |
| 725 | |
| 726 | /* queue full, wait: */ |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 727 | if (msgflg & IPC_NOWAIT) { |
| 728 | err = -EAGAIN; |
Manfred Spraul | bebcb92 | 2013-09-03 16:00:08 +0200 | [diff] [blame] | 729 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 731 | |
Davidlohr Bueso | ffa571d | 2014-01-27 17:07:10 -0800 | [diff] [blame] | 732 | /* enqueue the sender and prepare to block */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | ss_add(msq, &s); |
Rik van Riel | 6062a8d | 2013-04-30 19:15:44 -0700 | [diff] [blame] | 734 | |
| 735 | if (!ipc_rcu_getref(msq)) { |
| 736 | err = -EIDRM; |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 737 | goto out_unlock0; |
Rik van Riel | 6062a8d | 2013-04-30 19:15:44 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 740 | ipc_unlock_object(&msq->q_perm); |
| 741 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | schedule(); |
| 743 | |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 744 | rcu_read_lock(); |
| 745 | ipc_lock_object(&msq->q_perm); |
| 746 | |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 747 | ipc_rcu_putref(msq, ipc_rcu_free); |
Rafael Aquini | 0f3d2b0 | 2014-01-27 17:07:01 -0800 | [diff] [blame] | 748 | /* raced with RMID? */ |
| 749 | if (!ipc_valid_object(&msq->q_perm)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | err = -EIDRM; |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 751 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | ss_del(&s); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | if (signal_pending(current)) { |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 757 | err = -ERESTARTNOHAND; |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 758 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | } |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | } |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 762 | msq->q_lspid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | msq->q_stime = get_seconds(); |
| 764 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 765 | if (!pipelined_send(msq, msg)) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 766 | /* no one is waiting for this message, enqueue it */ |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 767 | list_add_tail(&msg->m_list, &msq->q_messages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | msq->q_cbytes += msgsz; |
| 769 | msq->q_qnum++; |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 770 | atomic_add(msgsz, &ns->msg_bytes); |
| 771 | atomic_inc(&ns->msg_hdrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | err = 0; |
| 775 | msg = NULL; |
| 776 | |
Davidlohr Bueso | 3dd1f78 | 2013-07-08 16:01:17 -0700 | [diff] [blame] | 777 | out_unlock0: |
| 778 | ipc_unlock_object(&msq->q_perm); |
| 779 | out_unlock1: |
| 780 | rcu_read_unlock(); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 781 | if (msg != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | free_msg(msg); |
| 783 | return err; |
| 784 | } |
| 785 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 786 | SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
| 787 | int, msgflg) |
suzuki | 651971c | 2006-12-06 20:37:48 -0800 | [diff] [blame] | 788 | { |
| 789 | long mtype; |
| 790 | |
| 791 | if (get_user(mtype, &msgp->mtype)) |
| 792 | return -EFAULT; |
| 793 | return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); |
| 794 | } |
| 795 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 796 | static inline int convert_mode(long *msgtyp, int msgflg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 798 | if (msgflg & MSG_COPY) |
| 799 | return SEARCH_NUMBER; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 800 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | * find message of correct type. |
| 802 | * msgtyp = 0 => get first. |
| 803 | * msgtyp > 0 => get first message of matching type. |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 804 | * msgtyp < 0 => get message with least type must be < abs(msgtype). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | */ |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 806 | if (*msgtyp == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | return SEARCH_ANY; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 808 | if (*msgtyp < 0) { |
| 809 | *msgtyp = -*msgtyp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | return SEARCH_LESSEQUAL; |
| 811 | } |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 812 | if (msgflg & MSG_EXCEPT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | return SEARCH_NOTEQUAL; |
| 814 | return SEARCH_EQUAL; |
| 815 | } |
| 816 | |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 817 | static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) |
| 818 | { |
| 819 | struct msgbuf __user *msgp = dest; |
| 820 | size_t msgsz; |
| 821 | |
| 822 | if (put_user(msg->m_type, &msgp->mtype)) |
| 823 | return -EFAULT; |
| 824 | |
| 825 | msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; |
| 826 | if (store_msg(msgp->mtext, msg, msgsz)) |
| 827 | return -EFAULT; |
| 828 | return msgsz; |
| 829 | } |
| 830 | |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 831 | #ifdef CONFIG_CHECKPOINT_RESTORE |
Stanislav Kinsbursky | 3fcfe78 | 2013-01-04 15:35:03 -0800 | [diff] [blame] | 832 | /* |
| 833 | * This function creates new kernel message structure, large enough to store |
| 834 | * bufsz message bytes. |
| 835 | */ |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 836 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 837 | { |
| 838 | struct msg_msg *copy; |
| 839 | |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 840 | /* |
| 841 | * Create dummy message to copy real message to. |
| 842 | */ |
| 843 | copy = load_msg(buf, bufsz); |
| 844 | if (!IS_ERR(copy)) |
| 845 | copy->m_ts = bufsz; |
| 846 | return copy; |
| 847 | } |
| 848 | |
Stanislav Kinsbursky | 85398aa | 2013-01-04 15:34:58 -0800 | [diff] [blame] | 849 | static inline void free_copy(struct msg_msg *copy) |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 850 | { |
Stanislav Kinsbursky | 85398aa | 2013-01-04 15:34:58 -0800 | [diff] [blame] | 851 | if (copy) |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 852 | free_msg(copy); |
| 853 | } |
| 854 | #else |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 855 | static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
Stanislav Kinsbursky | b30efe2 | 2013-01-04 15:35:00 -0800 | [diff] [blame] | 856 | { |
| 857 | return ERR_PTR(-ENOSYS); |
| 858 | } |
| 859 | |
Stanislav Kinsbursky | 85398aa | 2013-01-04 15:34:58 -0800 | [diff] [blame] | 860 | static inline void free_copy(struct msg_msg *copy) |
| 861 | { |
| 862 | } |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 863 | #endif |
| 864 | |
Peter Hurley | daaf74c | 2013-04-30 19:15:04 -0700 | [diff] [blame] | 865 | static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) |
| 866 | { |
Svenning Sørensen | 368ae53 | 2013-08-28 16:35:17 -0700 | [diff] [blame] | 867 | struct msg_msg *msg, *found = NULL; |
Peter Hurley | daaf74c | 2013-04-30 19:15:04 -0700 | [diff] [blame] | 868 | long count = 0; |
| 869 | |
| 870 | list_for_each_entry(msg, &msq->q_messages, m_list) { |
| 871 | if (testmsg(msg, *msgtyp, mode) && |
| 872 | !security_msg_queue_msgrcv(msq, msg, current, |
| 873 | *msgtyp, mode)) { |
| 874 | if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { |
| 875 | *msgtyp = msg->m_type - 1; |
Svenning Sørensen | 368ae53 | 2013-08-28 16:35:17 -0700 | [diff] [blame] | 876 | found = msg; |
Peter Hurley | daaf74c | 2013-04-30 19:15:04 -0700 | [diff] [blame] | 877 | } else if (mode == SEARCH_NUMBER) { |
| 878 | if (*msgtyp == count) |
| 879 | return msg; |
| 880 | } else |
| 881 | return msg; |
| 882 | count++; |
| 883 | } |
| 884 | } |
| 885 | |
Svenning Sørensen | 368ae53 | 2013-08-28 16:35:17 -0700 | [diff] [blame] | 886 | return found ?: ERR_PTR(-EAGAIN); |
Peter Hurley | daaf74c | 2013-04-30 19:15:04 -0700 | [diff] [blame] | 887 | } |
| 888 | |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 889 | long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 890 | long (*msg_handler)(void __user *, struct msg_msg *, size_t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | int mode; |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 893 | struct msg_queue *msq; |
Kirill Korotaev | 1e78693 | 2006-10-02 02:18:21 -0700 | [diff] [blame] | 894 | struct ipc_namespace *ns; |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 895 | struct msg_msg *msg, *copy = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Peter Hurley | 88b9e45 | 2013-03-08 12:43:27 -0800 | [diff] [blame] | 897 | ns = current->nsproxy->ipc_ns; |
| 898 | |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 899 | if (msqid < 0 || (long) bufsz < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | return -EINVAL; |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 901 | |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 902 | if (msgflg & MSG_COPY) { |
Michael Kerrisk | 4f87dac | 2014-03-10 14:46:07 +0100 | [diff] [blame] | 903 | if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT)) |
| 904 | return -EINVAL; |
Peter Hurley | 8ac6ed5 | 2013-04-30 19:14:54 -0700 | [diff] [blame] | 905 | copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax)); |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 906 | if (IS_ERR(copy)) |
| 907 | return PTR_ERR(copy); |
| 908 | } |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 909 | mode = convert_mode(&msgtyp, msgflg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 911 | rcu_read_lock(); |
| 912 | msq = msq_obtain_object_check(ns, msqid); |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 913 | if (IS_ERR(msq)) { |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 914 | rcu_read_unlock(); |
Stanislav Kinsbursky | 85398aa | 2013-01-04 15:34:58 -0800 | [diff] [blame] | 915 | free_copy(copy); |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 916 | return PTR_ERR(msq); |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 917 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | for (;;) { |
| 920 | struct msg_receiver msr_d; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
| 922 | msg = ERR_PTR(-EACCES); |
Serge E. Hallyn | b0e7759 | 2011-03-23 16:43:24 -0700 | [diff] [blame] | 923 | if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 924 | goto out_unlock1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 926 | ipc_lock_object(&msq->q_perm); |
Davidlohr Bueso | 4271b05 | 2013-09-30 13:45:26 -0700 | [diff] [blame] | 927 | |
| 928 | /* raced with RMID? */ |
Rafael Aquini | 0f3d2b0 | 2014-01-27 17:07:01 -0800 | [diff] [blame] | 929 | if (!ipc_valid_object(&msq->q_perm)) { |
Davidlohr Bueso | 4271b05 | 2013-09-30 13:45:26 -0700 | [diff] [blame] | 930 | msg = ERR_PTR(-EIDRM); |
| 931 | goto out_unlock0; |
| 932 | } |
| 933 | |
Peter Hurley | daaf74c | 2013-04-30 19:15:04 -0700 | [diff] [blame] | 934 | msg = find_msg(msq, &msgtyp, mode); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 935 | if (!IS_ERR(msg)) { |
| 936 | /* |
| 937 | * Found a suitable message. |
| 938 | * Unlink it from the queue. |
| 939 | */ |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 940 | if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | msg = ERR_PTR(-E2BIG); |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 942 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
Stanislav Kinsbursky | 3fcfe78 | 2013-01-04 15:35:03 -0800 | [diff] [blame] | 944 | /* |
| 945 | * If we are copying, then do not unlink message and do |
| 946 | * not update queue parameters. |
| 947 | */ |
Peter Hurley | 852028a | 2013-04-30 19:14:48 -0700 | [diff] [blame] | 948 | if (msgflg & MSG_COPY) { |
| 949 | msg = copy_msg(msg, copy); |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 950 | goto out_unlock0; |
Peter Hurley | 852028a | 2013-04-30 19:14:48 -0700 | [diff] [blame] | 951 | } |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | list_del(&msg->m_list); |
| 954 | msq->q_qnum--; |
| 955 | msq->q_rtime = get_seconds(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 956 | msq->q_lrpid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | msq->q_cbytes -= msg->m_ts; |
Kirill Korotaev | 3ac88a4 | 2007-10-18 23:40:56 -0700 | [diff] [blame] | 958 | atomic_sub(msg->m_ts, &ns->msg_bytes); |
| 959 | atomic_dec(&ns->msg_hdrs); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 960 | ss_wakeup(&msq->q_senders, 0); |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 961 | |
| 962 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 964 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | /* No message waiting. Wait for a message */ |
| 966 | if (msgflg & IPC_NOWAIT) { |
| 967 | msg = ERR_PTR(-ENOMSG); |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 968 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 970 | |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 971 | list_add_tail(&msr_d.r_list, &msq->q_receivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | msr_d.r_tsk = current; |
| 973 | msr_d.r_msgtype = msgtyp; |
| 974 | msr_d.r_mode = mode; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 975 | if (msgflg & MSG_NOERROR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | msr_d.r_maxsize = INT_MAX; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 977 | else |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 978 | msr_d.r_maxsize = bufsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | msr_d.r_msg = ERR_PTR(-EAGAIN); |
| 980 | current->state = TASK_INTERRUPTIBLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 982 | ipc_unlock_object(&msq->q_perm); |
| 983 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | schedule(); |
| 985 | |
| 986 | /* Lockless receive, part 1: |
| 987 | * Disable preemption. We don't hold a reference to the queue |
| 988 | * and getting a reference would defeat the idea of a lockless |
| 989 | * operation, thus the code relies on rcu to guarantee the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 990 | * existence of msq: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | * Prior to destruction, expunge_all(-EIRDM) changes r_msg. |
| 992 | * Thus if r_msg is -EAGAIN, then the queue not yet destroyed. |
| 993 | * rcu_read_lock() prevents preemption between reading r_msg |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 994 | * and acquiring the q_perm.lock in ipc_lock_object(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | */ |
| 996 | rcu_read_lock(); |
| 997 | |
| 998 | /* Lockless receive, part 2: |
| 999 | * Wait until pipelined_send or expunge_all are outside of |
| 1000 | * wake_up_process(). There is a race with exit(), see |
| 1001 | * ipc/mqueue.c for the details. |
| 1002 | */ |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 1003 | msg = (struct msg_msg *)msr_d.r_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | while (msg == NULL) { |
| 1005 | cpu_relax(); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1006 | msg = (struct msg_msg *)msr_d.r_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
| 1009 | /* Lockless receive, part 3: |
| 1010 | * If there is a message or an error then accept it without |
| 1011 | * locking. |
| 1012 | */ |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1013 | if (msg != ERR_PTR(-EAGAIN)) |
| 1014 | goto out_unlock1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | /* Lockless receive, part 3: |
| 1017 | * Acquire the queue spinlock. |
| 1018 | */ |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1019 | ipc_lock_object(&msq->q_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
| 1021 | /* Lockless receive, part 4: |
| 1022 | * Repeat test after acquiring the spinlock. |
| 1023 | */ |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 1024 | msg = (struct msg_msg *)msr_d.r_msg; |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1025 | if (msg != ERR_PTR(-EAGAIN)) |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1026 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | |
| 1028 | list_del(&msr_d.r_list); |
| 1029 | if (signal_pending(current)) { |
| 1030 | msg = ERR_PTR(-ERESTARTNOHAND); |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1031 | goto out_unlock0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1033 | |
| 1034 | ipc_unlock_object(&msq->q_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | } |
Davidlohr Bueso | 41a0d52 | 2013-07-08 16:01:18 -0700 | [diff] [blame] | 1036 | |
| 1037 | out_unlock0: |
| 1038 | ipc_unlock_object(&msq->q_perm); |
| 1039 | out_unlock1: |
| 1040 | rcu_read_unlock(); |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 1041 | if (IS_ERR(msg)) { |
Stanislav Kinsbursky | 85398aa | 2013-01-04 15:34:58 -0800 | [diff] [blame] | 1042 | free_copy(copy); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1043 | return PTR_ERR(msg); |
Stanislav Kinsbursky | 4a674f3 | 2013-01-04 15:34:55 -0800 | [diff] [blame] | 1044 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 1046 | bufsz = msg_handler(buf, msg, bufsz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | free_msg(msg); |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1048 | |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 1049 | return bufsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | } |
| 1051 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1052 | SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
| 1053 | long, msgtyp, int, msgflg) |
suzuki | 651971c | 2006-12-06 20:37:48 -0800 | [diff] [blame] | 1054 | { |
Stanislav Kinsbursky | f9dd87f | 2013-01-04 15:34:52 -0800 | [diff] [blame] | 1055 | return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill); |
suzuki | 651971c | 2006-12-06 20:37:48 -0800 | [diff] [blame] | 1056 | } |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | #ifdef CONFIG_PROC_FS |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 1059 | static int sysvipc_msg_proc_show(struct seq_file *s, void *it) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | { |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 1061 | struct user_namespace *user_ns = seq_user_ns(s); |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 1062 | struct msg_queue *msq = it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 1064 | return seq_printf(s, |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1065 | "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n", |
| 1066 | msq->q_perm.key, |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 1067 | msq->q_perm.id, |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1068 | msq->q_perm.mode, |
| 1069 | msq->q_cbytes, |
| 1070 | msq->q_qnum, |
| 1071 | msq->q_lspid, |
| 1072 | msq->q_lrpid, |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 1073 | from_kuid_munged(user_ns, msq->q_perm.uid), |
| 1074 | from_kgid_munged(user_ns, msq->q_perm.gid), |
| 1075 | from_kuid_munged(user_ns, msq->q_perm.cuid), |
| 1076 | from_kgid_munged(user_ns, msq->q_perm.cgid), |
Ingo Molnar | 5a06a36 | 2006-07-30 03:04:11 -0700 | [diff] [blame] | 1077 | msq->q_stime, |
| 1078 | msq->q_rtime, |
| 1079 | msq->q_ctime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | #endif |