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
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
67static int compat_prepare_timeout(struct timespec __user * *p,
68                  const struct compat_timespec __user *u)
69{
70    struct timespec ts;
71    if (!u) {
72        *p = NULL;
73        return 0;
74    }
75    *p = compat_alloc_user_space(sizeof(ts));
76    if (get_compat_timespec(&ts, u) || copy_to_user(*p, &ts, sizeof(ts)))
77        return -EFAULT;
78    return 0;
79}
80
81asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
82            const char __user *u_msg_ptr,
83            size_t msg_len, unsigned int msg_prio,
84            const struct compat_timespec __user *u_abs_timeout)
85{
86    struct timespec __user *u_ts;
87
88    if (compat_prepare_timeout(&u_ts, u_abs_timeout))
89        return -EFAULT;
90
91    return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len,
92            msg_prio, u_ts);
93}
94
95asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
96            char __user *u_msg_ptr,
97            size_t msg_len, unsigned int __user *u_msg_prio,
98            const struct compat_timespec __user *u_abs_timeout)
99{
100    struct timespec __user *u_ts;
101    if (compat_prepare_timeout(&u_ts, u_abs_timeout))
102        return -EFAULT;
103
104    return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len,
105            u_msg_prio, u_ts);
106}
107
108asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
109            const struct compat_sigevent __user *u_notification)
110{
111    struct sigevent __user *p = NULL;
112    if (u_notification) {
113        struct sigevent n;
114        p = compat_alloc_user_space(sizeof(*p));
115        if (get_compat_sigevent(&n, u_notification))
116            return -EFAULT;
117        if (n.sigev_notify == SIGEV_THREAD)
118            n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int);
119        if (copy_to_user(p, &n, sizeof(*p)))
120            return -EFAULT;
121    }
122    return sys_mq_notify(mqdes, p);
123}
124
125asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
126            const struct compat_mq_attr __user *u_mqstat,
127            struct compat_mq_attr __user *u_omqstat)
128{
129    struct mq_attr mqstat;
130    struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
131    long ret;
132
133    memset(&mqstat, 0, sizeof(mqstat));
134
135    if (u_mqstat) {
136        if (get_compat_mq_attr(&mqstat, u_mqstat) ||
137            copy_to_user(p, &mqstat, sizeof(mqstat)))
138            return -EFAULT;
139    }
140    ret = sys_mq_getsetattr(mqdes,
141                u_mqstat ? p : NULL,
142                u_omqstat ? p + 1 : NULL);
143    if (ret)
144        return ret;
145    if (u_omqstat) {
146        if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) ||
147            put_compat_mq_attr(&mqstat, u_omqstat))
148            return -EFAULT;
149    }
150    return 0;
151}
152

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