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>
22 * The next 2 defines are here bc this is the only file
23 * compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE
24 * and not CONFIG_IPC_NS.
26 struct ipc_namespace init_ipc_ns = {
28 /* It's not for this patch to change, but should this be 1? */
29 .refcount = ATOMIC_INIT(2),
31 #ifdef CONFIG_POSIX_MQUEUE
34 .mq_queues_max = DFLT_QUEUESMAX,
35 .mq_msg_max = DFLT_MSGMAX,
36 .mq_msgsize_max = DFLT_MSGSIZEMAX,
40 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
43 struct msg_msgseg* next;
44 /* the next part of the message follows immediately */
47 #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
48 #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
50 struct msg_msg *load_msg(const void __user *src, int len)
53 struct msg_msgseg **pseg;
58 if (alen > DATALEN_MSG)
61 msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
63 return ERR_PTR(-ENOMEM);
68 if (copy_from_user(msg + 1, src, alen)) {
74 src = ((char __user *)src) + alen;
77 struct msg_msgseg *seg;
79 if (alen > DATALEN_SEG)
81 seg = kmalloc(sizeof(*seg) + alen,
89 if (copy_from_user(seg + 1, src, alen)) {
95 src = ((char __user *)src) + alen;
98 err = security_msg_msg_alloc(msg);
109 int store_msg(void __user *dest, struct msg_msg *msg, int len)
112 struct msg_msgseg *seg;
115 if (alen > DATALEN_MSG)
117 if (copy_to_user(dest, msg + 1, alen))
121 dest = ((char __user *)dest) + alen;
125 if (alen > DATALEN_SEG)
127 if (copy_to_user(dest, seg + 1, alen))
130 dest = ((char __user *)dest) + alen;
136 void free_msg(struct msg_msg *msg)
138 struct msg_msgseg *seg;
140 security_msg_msg_free(msg);
144 while (seg != NULL) {
145 struct msg_msgseg *tmp = seg->next;