blob: ef6f91cc4490b5a36311083c1530c345507d0246
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 <linux/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 | COMPAT_SYSCALL_DEFINE4(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 | |
57 | memset(&attr, 0, sizeof(attr)); |
58 | |
59 | p = compat_alloc_user_space(sizeof(attr)); |
60 | if (get_compat_mq_attr(&attr, u_attr) || |
61 | copy_to_user(p, &attr, sizeof(attr))) |
62 | return -EFAULT; |
63 | } |
64 | return sys_mq_open(u_name, oflag, mode, p); |
65 | } |
66 | |
67 | COMPAT_SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, |
68 | const char __user *, u_msg_ptr, |
69 | compat_size_t, msg_len, unsigned int, msg_prio, |
70 | const struct compat_timespec __user *, u_abs_timeout) |
71 | { |
72 | struct timespec __user *u_ts; |
73 | |
74 | if (compat_convert_timespec(&u_ts, u_abs_timeout)) |
75 | return -EFAULT; |
76 | |
77 | return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len, |
78 | msg_prio, u_ts); |
79 | } |
80 | |
81 | COMPAT_SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, |
82 | char __user *, u_msg_ptr, |
83 | compat_size_t, msg_len, unsigned int __user *, u_msg_prio, |
84 | const struct compat_timespec __user *, u_abs_timeout) |
85 | { |
86 | struct timespec __user *u_ts; |
87 | |
88 | if (compat_convert_timespec(&u_ts, u_abs_timeout)) |
89 | return -EFAULT; |
90 | |
91 | return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len, |
92 | u_msg_prio, u_ts); |
93 | } |
94 | |
95 | COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
96 | const struct compat_sigevent __user *, u_notification) |
97 | { |
98 | struct sigevent __user *p = NULL; |
99 | if (u_notification) { |
100 | struct sigevent n; |
101 | p = compat_alloc_user_space(sizeof(*p)); |
102 | if (get_compat_sigevent(&n, u_notification)) |
103 | return -EFAULT; |
104 | if (n.sigev_notify == SIGEV_THREAD) |
105 | n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); |
106 | if (copy_to_user(p, &n, sizeof(*p))) |
107 | return -EFAULT; |
108 | } |
109 | return sys_mq_notify(mqdes, p); |
110 | } |
111 | |
112 | COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
113 | const struct compat_mq_attr __user *, u_mqstat, |
114 | struct compat_mq_attr __user *, u_omqstat) |
115 | { |
116 | struct mq_attr mqstat; |
117 | struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p)); |
118 | long ret; |
119 | |
120 | memset(&mqstat, 0, sizeof(mqstat)); |
121 | |
122 | if (u_mqstat) { |
123 | if (get_compat_mq_attr(&mqstat, u_mqstat) || |
124 | copy_to_user(p, &mqstat, sizeof(mqstat))) |
125 | return -EFAULT; |
126 | } |
127 | ret = sys_mq_getsetattr(mqdes, |
128 | u_mqstat ? p : NULL, |
129 | u_omqstat ? p + 1 : NULL); |
130 | if (ret) |
131 | return ret; |
132 | if (u_omqstat) { |
133 | if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) || |
134 | put_compat_mq_attr(&mqstat, u_omqstat)) |
135 | return -EFAULT; |
136 | } |
137 | return 0; |
138 | } |
139 |