Root/ipc/compat_mq.c

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
17struct 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
25static 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
37static 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
49asmlinkage 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
64static 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
78asmlinkage 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
92asmlinkage 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
105asmlinkage 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
122asmlinkage 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}
147

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