Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/ipc/compat_mq.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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File size: 4132 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 4132 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * ipc/compat_mq.c |
3 | * 32 bit emulation for POSIX message queue system calls |
4 | * |
5 | * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation |
6 | * Author: Arnd Bergmann <arnd@arndb.de> |
7 | */ |
8 | |
9 | #include <linux/compat.h> |
10 | #include <linux/fs.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/mqueue.h> |
13 | #include <linux/syscalls.h> |
14 | |
15 | #include <asm/uaccess.h> |
16 | |
17 | struct compat_mq_attr { |
18 | compat_long_t mq_flags; /* message queue flags */ |
19 | compat_long_t mq_maxmsg; /* maximum number of messages */ |
20 | compat_long_t mq_msgsize; /* maximum message size */ |
21 | compat_long_t mq_curmsgs; /* number of messages currently queued */ |
22 | compat_long_t __reserved[4]; /* ignored for input, zeroed for output */ |
23 | }; |
24 | |
25 | static inline int get_compat_mq_attr(struct mq_attr *attr, |
26 | const struct compat_mq_attr __user *uattr) |
27 | { |
28 | if (!access_ok(VERIFY_READ, uattr, sizeof *uattr)) |
29 | return -EFAULT; |
30 | |
31 | return __get_user(attr->mq_flags, &uattr->mq_flags) |
32 | | __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg) |
33 | | __get_user(attr->mq_msgsize, &uattr->mq_msgsize) |
34 | | __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs); |
35 | } |
36 | |
37 | static inline int put_compat_mq_attr(const struct mq_attr *attr, |
38 | struct compat_mq_attr __user *uattr) |
39 | { |
40 | if (clear_user(uattr, sizeof *uattr)) |
41 | return -EFAULT; |
42 | |
43 | return __put_user(attr->mq_flags, &uattr->mq_flags) |
44 | | __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg) |
45 | | __put_user(attr->mq_msgsize, &uattr->mq_msgsize) |
46 | | __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs); |
47 | } |
48 | |
49 | asmlinkage long compat_sys_mq_open(const char __user *u_name, |
50 | int oflag, compat_mode_t mode, |
51 | struct compat_mq_attr __user *u_attr) |
52 | { |
53 | void __user *p = NULL; |
54 | if (u_attr && oflag & O_CREAT) { |
55 | struct mq_attr attr; |
56 | p = compat_alloc_user_space(sizeof(attr)); |
57 | if (get_compat_mq_attr(&attr, u_attr) || |
58 | copy_to_user(p, &attr, sizeof(attr))) |
59 | return -EFAULT; |
60 | } |
61 | return sys_mq_open(u_name, oflag, mode, p); |
62 | } |
63 | |
64 | static int compat_prepare_timeout(struct timespec __user * *p, |
65 | const struct compat_timespec __user *u) |
66 | { |
67 | struct timespec ts; |
68 | if (!u) { |
69 | *p = NULL; |
70 | return 0; |
71 | } |
72 | *p = compat_alloc_user_space(sizeof(ts)); |
73 | if (get_compat_timespec(&ts, u) || copy_to_user(*p, &ts, sizeof(ts))) |
74 | return -EFAULT; |
75 | return 0; |
76 | } |
77 | |
78 | asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes, |
79 | const char __user *u_msg_ptr, |
80 | size_t msg_len, unsigned int msg_prio, |
81 | const struct compat_timespec __user *u_abs_timeout) |
82 | { |
83 | struct timespec __user *u_ts; |
84 | |
85 | if (compat_prepare_timeout(&u_ts, u_abs_timeout)) |
86 | return -EFAULT; |
87 | |
88 | return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len, |
89 | msg_prio, u_ts); |
90 | } |
91 | |
92 | asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes, |
93 | char __user *u_msg_ptr, |
94 | size_t msg_len, unsigned int __user *u_msg_prio, |
95 | const struct compat_timespec __user *u_abs_timeout) |
96 | { |
97 | struct timespec __user *u_ts; |
98 | if (compat_prepare_timeout(&u_ts, u_abs_timeout)) |
99 | return -EFAULT; |
100 | |
101 | return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len, |
102 | u_msg_prio, u_ts); |
103 | } |
104 | |
105 | asmlinkage long compat_sys_mq_notify(mqd_t mqdes, |
106 | const struct compat_sigevent __user *u_notification) |
107 | { |
108 | struct sigevent __user *p = NULL; |
109 | if (u_notification) { |
110 | struct sigevent n; |
111 | p = compat_alloc_user_space(sizeof(*p)); |
112 | if (get_compat_sigevent(&n, u_notification)) |
113 | return -EFAULT; |
114 | if (n.sigev_notify == SIGEV_THREAD) |
115 | n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); |
116 | if (copy_to_user(p, &n, sizeof(*p))) |
117 | return -EFAULT; |
118 | } |
119 | return sys_mq_notify(mqdes, p); |
120 | } |
121 | |
122 | asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes, |
123 | const struct compat_mq_attr __user *u_mqstat, |
124 | struct compat_mq_attr __user *u_omqstat) |
125 | { |
126 | struct mq_attr mqstat; |
127 | struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p)); |
128 | long ret; |
129 | |
130 | if (u_mqstat) { |
131 | if (get_compat_mq_attr(&mqstat, u_mqstat) || |
132 | copy_to_user(p, &mqstat, sizeof(mqstat))) |
133 | return -EFAULT; |
134 | } |
135 | ret = sys_mq_getsetattr(mqdes, |
136 | u_mqstat ? p : NULL, |
137 | u_omqstat ? p + 1 : NULL); |
138 | if (ret) |
139 | return ret; |
140 | if (u_omqstat) { |
141 | if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) || |
142 | put_compat_mq_attr(&mqstat, u_omqstat)) |
143 | return -EFAULT; |
144 | } |
145 | return 0; |
146 | } |