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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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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 <asm/uaccess.h> |
20 | |
21 | #include "util.h" |
22 | |
23 | DEFINE_SPINLOCK(mq_lock); |
24 | |
25 | /* |
26 | * The next 2 defines are here bc this is the only file |
27 | * compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE |
28 | * and not CONFIG_IPC_NS. |
29 | */ |
30 | struct ipc_namespace init_ipc_ns = { |
31 | .count = ATOMIC_INIT(1), |
32 | .user_ns = &init_user_ns, |
33 | }; |
34 | |
35 | atomic_t nr_ipc_ns = ATOMIC_INIT(1); |
36 | |
37 | struct msg_msgseg { |
38 | struct msg_msgseg* next; |
39 | /* the next part of the message follows immediately */ |
40 | }; |
41 | |
42 | #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg)) |
43 | #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg)) |
44 | |
45 | struct msg_msg *load_msg(const void __user *src, int len) |
46 | { |
47 | struct msg_msg *msg; |
48 | struct msg_msgseg **pseg; |
49 | int err; |
50 | int alen; |
51 | |
52 | alen = len; |
53 | if (alen > DATALEN_MSG) |
54 | alen = DATALEN_MSG; |
55 | |
56 | msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL); |
57 | if (msg == NULL) |
58 | return ERR_PTR(-ENOMEM); |
59 | |
60 | msg->next = NULL; |
61 | msg->security = NULL; |
62 | |
63 | if (copy_from_user(msg + 1, src, alen)) { |
64 | err = -EFAULT; |
65 | goto out_err; |
66 | } |
67 | |
68 | len -= alen; |
69 | src = ((char __user *)src) + alen; |
70 | pseg = &msg->next; |
71 | while (len > 0) { |
72 | struct msg_msgseg *seg; |
73 | alen = len; |
74 | if (alen > DATALEN_SEG) |
75 | alen = DATALEN_SEG; |
76 | seg = kmalloc(sizeof(*seg) + alen, |
77 | GFP_KERNEL); |
78 | if (seg == NULL) { |
79 | err = -ENOMEM; |
80 | goto out_err; |
81 | } |
82 | *pseg = seg; |
83 | seg->next = NULL; |
84 | if (copy_from_user(seg + 1, src, alen)) { |
85 | err = -EFAULT; |
86 | goto out_err; |
87 | } |
88 | pseg = &seg->next; |
89 | len -= alen; |
90 | src = ((char __user *)src) + alen; |
91 | } |
92 | |
93 | err = security_msg_msg_alloc(msg); |
94 | if (err) |
95 | goto out_err; |
96 | |
97 | return msg; |
98 | |
99 | out_err: |
100 | free_msg(msg); |
101 | return ERR_PTR(err); |
102 | } |
103 | |
104 | int store_msg(void __user *dest, struct msg_msg *msg, int len) |
105 | { |
106 | int alen; |
107 | struct msg_msgseg *seg; |
108 | |
109 | alen = len; |
110 | if (alen > DATALEN_MSG) |
111 | alen = DATALEN_MSG; |
112 | if (copy_to_user(dest, msg + 1, alen)) |
113 | return -1; |
114 | |
115 | len -= alen; |
116 | dest = ((char __user *)dest) + alen; |
117 | seg = msg->next; |
118 | while (len > 0) { |
119 | alen = len; |
120 | if (alen > DATALEN_SEG) |
121 | alen = DATALEN_SEG; |
122 | if (copy_to_user(dest, seg + 1, alen)) |
123 | return -1; |
124 | len -= alen; |
125 | dest = ((char __user *)dest) + alen; |
126 | seg = seg->next; |
127 | } |
128 | return 0; |
129 | } |
130 | |
131 | void free_msg(struct msg_msg *msg) |
132 | { |
133 | struct msg_msgseg *seg; |
134 | |
135 | security_msg_msg_free(msg); |
136 | |
137 | seg = msg->next; |
138 | kfree(msg); |
139 | while (seg != NULL) { |
140 | struct msg_msgseg *tmp = seg->next; |
141 | kfree(seg); |
142 | seg = tmp; |
143 | } |
144 | } |
145 |
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od-2011-09-04
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v2.6.34-rc5
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