1 files changed, 146 insertions, 0 deletions

diff --git a/ipc/compat_mq.c b/ipc/compat_mq.c
new file mode 100644
index 000000000000..d8d1e9ff4e88
--- /dev/null
+++ b/ipc/compat_mq.c
@@ -0,0 +1,146 @@
+/*
+ *  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;
+}