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 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 49COMPAT_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 67COMPAT_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 81COMPAT_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 95COMPAT_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 112COMPAT_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