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 <asm/uaccess.h>
21 struct msg_msgseg* next;
22 /* the next part of the message follows immediately */
25 #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
26 #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
28 struct msg_msg *load_msg(const void __user *src, int len)
31 struct msg_msgseg **pseg;
36 if (alen > DATALEN_MSG)
39 msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
41 return ERR_PTR(-ENOMEM);
46 if (copy_from_user(msg + 1, src, alen)) {
52 src = ((char __user *)src) + alen;
55 struct msg_msgseg *seg;
57 if (alen > DATALEN_SEG)
59 seg = kmalloc(sizeof(*seg) + alen,
67 if (copy_from_user(seg + 1, src, alen)) {
73 src = ((char __user *)src) + alen;
76 err = security_msg_msg_alloc(msg);
87 int store_msg(void __user *dest, struct msg_msg *msg, int len)
90 struct msg_msgseg *seg;
93 if (alen > DATALEN_MSG)
95 if (copy_to_user(dest, msg + 1, alen))
99 dest = ((char __user *)dest) + alen;
103 if (alen > DATALEN_SEG)
105 if (copy_to_user(dest, seg + 1, alen))
108 dest = ((char __user *)dest) + alen;
114 void free_msg(struct msg_msg *msg)
116 struct msg_msgseg *seg;
118 security_msg_msg_free(msg);
122 while (seg != NULL) {
123 struct msg_msgseg *tmp = seg->next;