Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 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 | |
Heiko Carstens | 5d70a59 | 2014-03-04 11:17:50 +0100 | [diff] [blame^] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
| 53 | void __user *p = NULL; |
| 54 | if (u_attr && oflag & O_CREAT) { |
| 55 | struct mq_attr attr; |
Dan Rosenberg | 03145be | 2010-10-27 15:34:17 -0700 | [diff] [blame] | 56 | |
| 57 | memset(&attr, 0, sizeof(attr)); |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 67 | static int compat_prepare_timeout(struct timespec __user **p, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 81 | asmlinkage 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 | |
| 95 | asmlinkage 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 | |
Heiko Carstens | 5d70a59 | 2014-03-04 11:17:50 +0100 | [diff] [blame^] | 108 | COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, |
| 109 | const struct compat_sigevent __user *, u_notification) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Heiko Carstens | 5d70a59 | 2014-03-04 11:17:50 +0100 | [diff] [blame^] | 125 | COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, |
| 126 | const struct compat_mq_attr __user *, u_mqstat, |
| 127 | struct compat_mq_attr __user *, u_omqstat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | struct mq_attr mqstat; |
| 130 | struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p)); |
| 131 | long ret; |
| 132 | |
Dan Rosenberg | 03145be | 2010-10-27 15:34:17 -0700 | [diff] [blame] | 133 | memset(&mqstat, 0, sizeof(mqstat)); |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |