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