152 строки
4.1 KiB
C
152 строки
4.1 KiB
C
/*
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* ipc/compat_mq.c
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* 32 bit emulation for POSIX message queue system calls
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*
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* Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author: Arnd Bergmann <arnd@arndb.de>
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*/
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#include <linux/compat.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/mqueue.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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struct compat_mq_attr {
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compat_long_t mq_flags; /* message queue flags */
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compat_long_t mq_maxmsg; /* maximum number of messages */
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compat_long_t mq_msgsize; /* maximum message size */
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compat_long_t mq_curmsgs; /* number of messages currently queued */
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compat_long_t __reserved[4]; /* ignored for input, zeroed for output */
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};
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static inline int get_compat_mq_attr(struct mq_attr *attr,
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const struct compat_mq_attr __user *uattr)
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{
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if (!access_ok(VERIFY_READ, uattr, sizeof *uattr))
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return -EFAULT;
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return __get_user(attr->mq_flags, &uattr->mq_flags)
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| __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
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| __get_user(attr->mq_msgsize, &uattr->mq_msgsize)
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| __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
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}
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static inline int put_compat_mq_attr(const struct mq_attr *attr,
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struct compat_mq_attr __user *uattr)
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{
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if (clear_user(uattr, sizeof *uattr))
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return -EFAULT;
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return __put_user(attr->mq_flags, &uattr->mq_flags)
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| __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
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| __put_user(attr->mq_msgsize, &uattr->mq_msgsize)
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| __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
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}
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asmlinkage long compat_sys_mq_open(const char __user *u_name,
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int oflag, compat_mode_t mode,
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struct compat_mq_attr __user *u_attr)
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{
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void __user *p = NULL;
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if (u_attr && oflag & O_CREAT) {
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struct mq_attr attr;
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memset(&attr, 0, sizeof(attr));
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p = compat_alloc_user_space(sizeof(attr));
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if (get_compat_mq_attr(&attr, u_attr) ||
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copy_to_user(p, &attr, sizeof(attr)))
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return -EFAULT;
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}
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return sys_mq_open(u_name, oflag, mode, p);
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}
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static int compat_prepare_timeout(struct timespec __user **p,
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const struct compat_timespec __user *u)
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{
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struct timespec ts;
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if (!u) {
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*p = NULL;
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return 0;
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}
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*p = compat_alloc_user_space(sizeof(ts));
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if (get_compat_timespec(&ts, u) || copy_to_user(*p, &ts, sizeof(ts)))
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return -EFAULT;
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return 0;
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}
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asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
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const char __user *u_msg_ptr,
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size_t msg_len, unsigned int msg_prio,
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const struct compat_timespec __user *u_abs_timeout)
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{
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struct timespec __user *u_ts;
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if (compat_prepare_timeout(&u_ts, u_abs_timeout))
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return -EFAULT;
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return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len,
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msg_prio, u_ts);
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}
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asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
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char __user *u_msg_ptr,
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size_t msg_len, unsigned int __user *u_msg_prio,
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const struct compat_timespec __user *u_abs_timeout)
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{
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struct timespec __user *u_ts;
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if (compat_prepare_timeout(&u_ts, u_abs_timeout))
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return -EFAULT;
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return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len,
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u_msg_prio, u_ts);
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}
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asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
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const struct compat_sigevent __user *u_notification)
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{
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struct sigevent __user *p = NULL;
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if (u_notification) {
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struct sigevent n;
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p = compat_alloc_user_space(sizeof(*p));
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if (get_compat_sigevent(&n, u_notification))
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return -EFAULT;
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if (n.sigev_notify == SIGEV_THREAD)
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n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int);
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if (copy_to_user(p, &n, sizeof(*p)))
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return -EFAULT;
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}
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return sys_mq_notify(mqdes, p);
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}
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asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
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const struct compat_mq_attr __user *u_mqstat,
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struct compat_mq_attr __user *u_omqstat)
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{
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struct mq_attr mqstat;
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struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
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long ret;
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memset(&mqstat, 0, sizeof(mqstat));
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if (u_mqstat) {
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if (get_compat_mq_attr(&mqstat, u_mqstat) ||
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copy_to_user(p, &mqstat, sizeof(mqstat)))
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return -EFAULT;
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}
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ret = sys_mq_getsetattr(mqdes,
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u_mqstat ? p : NULL,
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u_omqstat ? p + 1 : NULL);
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if (ret)
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return ret;
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if (u_omqstat) {
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if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) ||
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put_compat_mq_attr(&mqstat, u_omqstat))
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return -EFAULT;
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}
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return 0;
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}
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