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TOMOYO Linux Cross Reference
Linux/ipc/msgutil.c

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  1 /*
  2  * linux/ipc/msgutil.c
  3  * Copyright (C) 1999, 2004 Manfred Spraul
  4  *
  5  * This file is released under GNU General Public Licence version 2 or
  6  * (at your option) any later version.
  7  *
  8  * See the file COPYING for more details.
  9  */
 10 
 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_fs.h>
 20 #include <asm/uaccess.h>
 21 
 22 #include "util.h"
 23 
 24 DEFINE_SPINLOCK(mq_lock);
 25 
 26 /*
 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.
 30  */
 31 struct ipc_namespace init_ipc_ns = {
 32         .count          = ATOMIC_INIT(1),
 33         .user_ns = &init_user_ns,
 34         .proc_inum = PROC_IPC_INIT_INO,
 35 };
 36 
 37 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
 38 
 39 struct msg_msgseg {
 40         struct msg_msgseg* next;
 41         /* the next part of the message follows immediately */
 42 };
 43 
 44 #define DATALEN_MSG     (PAGE_SIZE-sizeof(struct msg_msg))
 45 #define DATALEN_SEG     (PAGE_SIZE-sizeof(struct msg_msgseg))
 46 
 47 struct msg_msg *load_msg(const void __user *src, int len)
 48 {
 49         struct msg_msg *msg;
 50         struct msg_msgseg **pseg;
 51         int err;
 52         int alen;
 53 
 54         alen = len;
 55         if (alen > DATALEN_MSG)
 56                 alen = DATALEN_MSG;
 57 
 58         msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
 59         if (msg == NULL)
 60                 return ERR_PTR(-ENOMEM);
 61 
 62         msg->next = NULL;
 63         msg->security = NULL;
 64 
 65         if (copy_from_user(msg + 1, src, alen)) {
 66                 err = -EFAULT;
 67                 goto out_err;
 68         }
 69 
 70         len -= alen;
 71         src = ((char __user *)src) + alen;
 72         pseg = &msg->next;
 73         while (len > 0) {
 74                 struct msg_msgseg *seg;
 75                 alen = len;
 76                 if (alen > DATALEN_SEG)
 77                         alen = DATALEN_SEG;
 78                 seg = kmalloc(sizeof(*seg) + alen,
 79                                                  GFP_KERNEL);
 80                 if (seg == NULL) {
 81                         err = -ENOMEM;
 82                         goto out_err;
 83                 }
 84                 *pseg = seg;
 85                 seg->next = NULL;
 86                 if (copy_from_user(seg + 1, src, alen)) {
 87                         err = -EFAULT;
 88                         goto out_err;
 89                 }
 90                 pseg = &seg->next;
 91                 len -= alen;
 92                 src = ((char __user *)src) + alen;
 93         }
 94 
 95         err = security_msg_msg_alloc(msg);
 96         if (err)
 97                 goto out_err;
 98 
 99         return msg;
100 
101 out_err:
102         free_msg(msg);
103         return ERR_PTR(err);
104 }
105 #ifdef CONFIG_CHECKPOINT_RESTORE
106 struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
107 {
108         struct msg_msgseg *dst_pseg, *src_pseg;
109         int len = src->m_ts;
110         int alen;
111 
112         BUG_ON(dst == NULL);
113         if (src->m_ts > dst->m_ts)
114                 return ERR_PTR(-EINVAL);
115 
116         alen = len;
117         if (alen > DATALEN_MSG)
118                 alen = DATALEN_MSG;
119 
120         memcpy(dst + 1, src + 1, alen);
121 
122         len -= alen;
123         dst_pseg = dst->next;
124         src_pseg = src->next;
125         while (len > 0) {
126                 alen = len;
127                 if (alen > DATALEN_SEG)
128                         alen = DATALEN_SEG;
129                 memcpy(dst_pseg + 1, src_pseg + 1, alen);
130                 dst_pseg = dst_pseg->next;
131                 len -= alen;
132                 src_pseg = src_pseg->next;
133         }
134 
135         dst->m_type = src->m_type;
136         dst->m_ts = src->m_ts;
137 
138         return dst;
139 }
140 #else
141 struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
142 {
143         return ERR_PTR(-ENOSYS);
144 }
145 #endif
146 int store_msg(void __user *dest, struct msg_msg *msg, int len)
147 {
148         int alen;
149         struct msg_msgseg *seg;
150 
151         alen = len;
152         if (alen > DATALEN_MSG)
153                 alen = DATALEN_MSG;
154         if (copy_to_user(dest, msg + 1, alen))
155                 return -1;
156 
157         len -= alen;
158         dest = ((char __user *)dest) + alen;
159         seg = msg->next;
160         while (len > 0) {
161                 alen = len;
162                 if (alen > DATALEN_SEG)
163                         alen = DATALEN_SEG;
164                 if (copy_to_user(dest, seg + 1, alen))
165                         return -1;
166                 len -= alen;
167                 dest = ((char __user *)dest) + alen;
168                 seg = seg->next;
169         }
170         return 0;
171 }
172 
173 void free_msg(struct msg_msg *msg)
174 {
175         struct msg_msgseg *seg;
176 
177         security_msg_msg_free(msg);
178 
179         seg = msg->next;
180         kfree(msg);
181         while (seg != NULL) {
182                 struct msg_msgseg *tmp = seg->next;
183                 kfree(seg);
184                 seg = tmp;
185         }
186 }
187 

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