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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/ipc_namespace.h> |
17 | #include <asm/uaccess.h> |
18 | |
19 | #include "util.h" |
20 | |
21 | DEFINE_SPINLOCK(mq_lock); |
22 | |
23 | /* |
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. |
27 | */ |
28 | struct ipc_namespace init_ipc_ns = { |
29 | .count = ATOMIC_INIT(1), |
30 | .user_ns = &init_user_ns, |
31 | }; |
32 | |
33 | atomic_t nr_ipc_ns = ATOMIC_INIT(1); |
34 | |
35 | struct msg_msgseg { |
36 | struct msg_msgseg* next; |
37 | /* the next part of the message follows immediately */ |
38 | }; |
39 | |
40 | #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg)) |
41 | #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg)) |
42 | |
43 | struct msg_msg *load_msg(const void __user *src, int len) |
44 | { |
45 | struct msg_msg *msg; |
46 | struct msg_msgseg **pseg; |
47 | int err; |
48 | int alen; |
49 | |
50 | alen = len; |
51 | if (alen > DATALEN_MSG) |
52 | alen = DATALEN_MSG; |
53 | |
54 | msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL); |
55 | if (msg == NULL) |
56 | return ERR_PTR(-ENOMEM); |
57 | |
58 | msg->next = NULL; |
59 | msg->security = NULL; |
60 | |
61 | if (copy_from_user(msg + 1, src, alen)) { |
62 | err = -EFAULT; |
63 | goto out_err; |
64 | } |
65 | |
66 | len -= alen; |
67 | src = ((char __user *)src) + alen; |
68 | pseg = &msg->next; |
69 | while (len > 0) { |
70 | struct msg_msgseg *seg; |
71 | alen = len; |
72 | if (alen > DATALEN_SEG) |
73 | alen = DATALEN_SEG; |
74 | seg = kmalloc(sizeof(*seg) + alen, |
75 | GFP_KERNEL); |
76 | if (seg == NULL) { |
77 | err = -ENOMEM; |
78 | goto out_err; |
79 | } |
80 | *pseg = seg; |
81 | seg->next = NULL; |
82 | if (copy_from_user(seg + 1, src, alen)) { |
83 | err = -EFAULT; |
84 | goto out_err; |
85 | } |
86 | pseg = &seg->next; |
87 | len -= alen; |
88 | src = ((char __user *)src) + alen; |
89 | } |
90 | |
91 | err = security_msg_msg_alloc(msg); |
92 | if (err) |
93 | goto out_err; |
94 | |
95 | return msg; |
96 | |
97 | out_err: |
98 | free_msg(msg); |
99 | return ERR_PTR(err); |
100 | } |
101 | |
102 | int store_msg(void __user *dest, struct msg_msg *msg, int len) |
103 | { |
104 | int alen; |
105 | struct msg_msgseg *seg; |
106 | |
107 | alen = len; |
108 | if (alen > DATALEN_MSG) |
109 | alen = DATALEN_MSG; |
110 | if (copy_to_user(dest, msg + 1, alen)) |
111 | return -1; |
112 | |
113 | len -= alen; |
114 | dest = ((char __user *)dest) + alen; |
115 | seg = msg->next; |
116 | while (len > 0) { |
117 | alen = len; |
118 | if (alen > DATALEN_SEG) |
119 | alen = DATALEN_SEG; |
120 | if (copy_to_user(dest, seg + 1, alen)) |
121 | return -1; |
122 | len -= alen; |
123 | dest = ((char __user *)dest) + alen; |
124 | seg = seg->next; |
125 | } |
126 | return 0; |
127 | } |
128 | |
129 | void free_msg(struct msg_msg *msg) |
130 | { |
131 | struct msg_msgseg *seg; |
132 | |
133 | security_msg_msg_free(msg); |
134 | |
135 | seg = msg->next; |
136 | kfree(msg); |
137 | while (seg != NULL) { |
138 | struct msg_msgseg *tmp = seg->next; |
139 | kfree(seg); |
140 | seg = tmp; |
141 | } |
142 | } |
143 |
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