3 * Copyright (C) 1999, 2004 Manfred Spraul
5 * This file is released under GNU General Public Licence version 2 or
6 * (at your option) any later version.
8 * See the file COPYING for more details.
11 #include <linux/spinlock.h>
12 #include <linux/init.h>
13 #include <linux/security.h>
14 #include <linux/slab.h>
15 #include <linux/ipc.h>
16 #include <linux/ipc_namespace.h>
17 #include <asm/uaccess.h>
21 DEFINE_SPINLOCK(mq_lock);
24 * The next 2 defines are here bc this is the only file
25 * compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE
26 * and not CONFIG_IPC_NS.
28 struct ipc_namespace init_ipc_ns = {
29 .count = ATOMIC_INIT(1),
30 #ifdef CONFIG_POSIX_MQUEUE
31 .mq_queues_max = DFLT_QUEUESMAX,
32 .mq_msg_max = DFLT_MSGMAX,
33 .mq_msgsize_max = DFLT_MSGSIZEMAX,
37 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
40 struct msg_msgseg* next;
41 /* the next part of the message follows immediately */
44 #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
45 #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
47 struct msg_msg *load_msg(const void __user *src, int len)
50 struct msg_msgseg **pseg;
55 if (alen > DATALEN_MSG)
58 msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
60 return ERR_PTR(-ENOMEM);
65 if (copy_from_user(msg + 1, src, alen)) {
71 src = ((char __user *)src) + alen;
74 struct msg_msgseg *seg;
76 if (alen > DATALEN_SEG)
78 seg = kmalloc(sizeof(*seg) + alen,
86 if (copy_from_user(seg + 1, src, alen)) {
92 src = ((char __user *)src) + alen;
95 err = security_msg_msg_alloc(msg);
106 int store_msg(void __user *dest, struct msg_msg *msg, int len)
109 struct msg_msgseg *seg;
112 if (alen > DATALEN_MSG)
114 if (copy_to_user(dest, msg + 1, alen))
118 dest = ((char __user *)dest) + alen;
122 if (alen > DATALEN_SEG)
124 if (copy_to_user(dest, seg + 1, alen))
127 dest = ((char __user *)dest) + alen;
133 void free_msg(struct msg_msg *msg)
135 struct msg_msgseg *seg;
137 security_msg_msg_free(msg);
141 while (seg != NULL) {
142 struct msg_msgseg *tmp = seg->next;