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Linux/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 <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 

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