linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.

 *

 * Copyright (C) 2000       VA Linux Co

 * Copyright (C) 2000       Don Dugger <n0ano@valinux.com>

 * Copyright (C) 1999       Arun Sharma <arun.sharma@intel.com>

 * Copyright (C) 1997,1998  Jakub Jelinek (jj@sunsite.mff.cuni.cz)

 * Copyright (C) 1997       David S. Miller (davem@caip.rutgers.edu)

 * Copyright (C) 2000       Hewlett-Packard Co.

 * Copyright (C) 2000       David Mosberger-Tang <davidm@hpl.hp.com>

 * Copyright (C) 2000,2001  Andi Kleen, SuSE Labs

 */

​

#include <linux/kernel.h>

#include <linux/gfp.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/file.h>

#include <linux/icmpv6.h>

#include <linux/socket.h>

#include <linux/syscalls.h>

#include <linux/filter.h>

#include <linux/compat.h>

#include <linux/security.h>

#include <linux/audit.h>

#include <linux/export.h>

​

#include <net/scm.h>

#include <net/sock.h>

#include <net/ip.h>

#include <net/ipv6.h>

#include <linux/uaccess.h>

#include <net/compat.h>

​

int get_compat_msghdr(struct msghdr *kmsg,

              struct compat_msghdr __user *umsg,

              struct sockaddr __user **save_addr,

              struct iovec **iov)

{

    struct compat_msghdr msg;

    ssize_t err;

​

    if (copy_from_user(&msg, umsg, sizeof(*umsg)))

        return -EFAULT;

​

    kmsg->msg_flags = msg.msg_flags;

    kmsg->msg_namelen = msg.msg_namelen;

​

    if (!msg.msg_name)

        kmsg->msg_namelen = 0;

​

    if (kmsg->msg_namelen < 0)

        return -EINVAL;

​

    if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))

        kmsg->msg_namelen = sizeof(struct sockaddr_storage);

​

    kmsg->msg_control = compat_ptr(msg.msg_control);

    kmsg->msg_controllen = msg.msg_controllen;

​

    if (save_addr)

        *save_addr = compat_ptr(msg.msg_name);