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/msg.h>
17 #include <linux/ipc_namespace.h>
18 #include <linux/utsname.h>
19 #include <linux/proc_ns.h>
20 #include <linux/uaccess.h>
24 DEFINE_SPINLOCK(mq_lock);
27 * The next 2 defines are here bc this is the only file
28 * compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE
29 * and not CONFIG_IPC_NS.
31 struct ipc_namespace init_ipc_ns = {
32 .count = ATOMIC_INIT(1),
33 .user_ns = &init_user_ns,
34 .ns.inum = PROC_IPC_INIT_INO,
36 .ns.ops = &ipcns_operations,
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 ((size_t)PAGE_SIZE-sizeof(struct msg_msg))
48 #define DATALEN_SEG ((size_t)PAGE_SIZE-sizeof(struct msg_msgseg))
51 static struct msg_msg *alloc_msg(size_t len)
54 struct msg_msgseg **pseg;
57 alen = min(len, DATALEN_MSG);
58 msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
68 struct msg_msgseg *seg;
69 alen = min(len, DATALEN_SEG);
70 seg = kmalloc(sizeof(*seg) + alen, GFP_KERNEL);
86 struct msg_msg *load_msg(const void __user *src, size_t len)
89 struct msg_msgseg *seg;
95 return ERR_PTR(-ENOMEM);
97 alen = min(len, DATALEN_MSG);
98 if (copy_from_user(msg + 1, src, alen))
101 for (seg = msg->next; seg != NULL; seg = seg->next) {
103 src = (char __user *)src + alen;
104 alen = min(len, DATALEN_SEG);
105 if (copy_from_user(seg + 1, src, alen))
109 err = security_msg_msg_alloc(msg);
119 #ifdef CONFIG_CHECKPOINT_RESTORE
120 struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
122 struct msg_msgseg *dst_pseg, *src_pseg;
123 size_t len = src->m_ts;
126 if (src->m_ts > dst->m_ts)
127 return ERR_PTR(-EINVAL);
129 alen = min(len, DATALEN_MSG);
130 memcpy(dst + 1, src + 1, alen);
132 for (dst_pseg = dst->next, src_pseg = src->next;
134 dst_pseg = dst_pseg->next, src_pseg = src_pseg->next) {
137 alen = min(len, DATALEN_SEG);
138 memcpy(dst_pseg + 1, src_pseg + 1, alen);
141 dst->m_type = src->m_type;
142 dst->m_ts = src->m_ts;
147 struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
149 return ERR_PTR(-ENOSYS);
152 int store_msg(void __user *dest, struct msg_msg *msg, size_t len)
155 struct msg_msgseg *seg;
157 alen = min(len, DATALEN_MSG);
158 if (copy_to_user(dest, msg + 1, alen))
161 for (seg = msg->next; seg != NULL; seg = seg->next) {
163 dest = (char __user *)dest + alen;
164 alen = min(len, DATALEN_SEG);
165 if (copy_to_user(dest, seg + 1, alen))
171 void free_msg(struct msg_msg *msg)
173 struct msg_msgseg *seg;
175 security_msg_msg_free(msg);
179 while (seg != NULL) {
180 struct msg_msgseg *tmp = seg->next;