arch/arm/kernel/sys_oabi-compat.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *  arch/arm/kernel/sys_oabi-compat.c
  *
  *  Compatibility wrappers for syscalls that are used from
  *  old ABI user space binaries with an EABI kernel.
  *
  *  Author:	Nicolas Pitre
  *  Created:	Oct 7, 2005
  *  Copyright:	MontaVista Software, Inc.
  */

 /*
  * The legacy ABI and the new ARM EABI have different rules making some
  * syscalls incompatible especially with structure arguments.
  * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
  * simply word aligned.  EABI also pads structures to the size of the largest
  * member it contains instead of the invariant 32-bit.
  *
  * The following syscalls are affected:
  *
  * sys_stat64:
  * sys_lstat64:
  * sys_fstat64:
  * sys_fstatat64:
  *
  *   struct stat64 has different sizes and some members are shifted
  *   Compatibility wrappers are needed for them and provided below.
  *
  * sys_fcntl64:
  *
  *   struct flock64 has different sizes and some members are shifted
  *   A compatibility wrapper is needed and provided below.
  *
  * sys_statfs64:
  * sys_fstatfs64:
  *
  *   struct statfs64 has extra padding with EABI growing its size from
  *   84 to 88.  This struct is now __attribute__((packed,aligned(4)))
  *   with a small assembly wrapper to force the sz argument to 84 if it is 88
  *   to avoid copying the extra padding over user space unexpecting it.
  *
  * sys_newuname:
  *
  *   struct new_utsname has no padding with EABI.  No problem there.
  *
  * sys_epoll_ctl:
  * sys_epoll_wait:
  *
  *   struct epoll_event has its second member shifted also affecting the
  *   structure size. Compatibility wrappers are needed and provided below.
  *
  * sys_ipc:
  * sys_semop:
  * sys_semtimedop:
  *
  *   struct sembuf loses its padding with EABI.  Since arrays of them are
  *   used they have to be copyed to remove the padding. Compatibility wrappers
  *   provided below.
  *
  * sys_bind:
  * sys_connect:
  * sys_sendmsg:
  * sys_sendto:
  * sys_socketcall:
  *
  *   struct sockaddr_un loses its padding with EABI.  Since the size of the
  *   structure is used as a validation test in unix_mkname(), we need to
  *   change the length argument to 110 whenever it is 112.  Compatibility
  *   wrappers provided below.
  */

 #include <linux/syscalls.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/cred.h>
 #include <linux/fcntl.h>
 #include <linux/eventpoll.h>
 #include <linux/sem.h>
 #include <linux/socket.h>
 #include <linux/net.h>
 #include <linux/ipc.h>
 #include <linux/ipc_namespace.h>
 #include <linux/uaccess.h>
 #include <linux/slab.h>

 #include <asm/syscall.h>

 struct oldabi_stat64 {
 	unsigned long long st_dev;
 	unsigned int	__pad1;
 	unsigned long	__st_ino;
 	unsigned int	st_mode;
 	unsigned int	st_nlink;

 	unsigned long	st_uid;
 	unsigned long	st_gid;

 	unsigned long long st_rdev;
 	unsigned int	__pad2;

 	long long	st_size;
 	unsigned long	st_blksize;
 	unsigned long long st_blocks;

 	unsigned long	st_atime;
 	unsigned long	st_atime_nsec;

 	unsigned long	st_mtime;
 	unsigned long	st_mtime_nsec;

 	unsigned long	st_ctime;
 	unsigned long	st_ctime_nsec;

 	unsigned long long st_ino;
 } __attribute__ ((packed,aligned(4)));

 static long cp_oldabi_stat64(struct kstat *stat,
 			     struct oldabi_stat64 __user *statbuf)
 {
 	struct oldabi_stat64 tmp;

 	tmp.st_dev = huge_encode_dev(stat->dev);
 	tmp.__pad1 = 0;
 	tmp.__st_ino = stat->ino;
 	tmp.st_mode = stat->mode;
 	tmp.st_nlink = stat->nlink;
 	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 	tmp.st_rdev = huge_encode_dev(stat->rdev);
 	tmp.st_size = stat->size;
 	tmp.st_blocks = stat->blocks;
 	tmp.__pad2 = 0;
 	tmp.st_blksize = stat->blksize;
 	tmp.st_atime = stat->atime.tv_sec;
 	tmp.st_atime_nsec = stat->atime.tv_nsec;
 	tmp.st_mtime = stat->mtime.tv_sec;
 	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 	tmp.st_ctime = stat->ctime.tv_sec;
 	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 	tmp.st_ino = stat->ino;
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }

 asmlinkage long sys_oabi_stat64(const char __user * filename,
 				struct oldabi_stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_stat(filename, &stat);
 	if (!error)
 		error = cp_oldabi_stat64(&stat, statbuf);
 	return error;
 }

 asmlinkage long sys_oabi_lstat64(const char __user * filename,
 				 struct oldabi_stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_lstat(filename, &stat);
 	if (!error)
 		error = cp_oldabi_stat64(&stat, statbuf);
 	return error;
 }

 asmlinkage long sys_oabi_fstat64(unsigned long fd,
 				 struct oldabi_stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_fstat(fd, &stat);
 	if (!error)
 		error = cp_oldabi_stat64(&stat, statbuf);
 	return error;
 }

 asmlinkage long sys_oabi_fstatat64(int dfd,
 				   const char __user *filename,
 				   struct oldabi_stat64  __user *statbuf,
 				   int flag)
 {
 	struct kstat stat;
 	int error;

 	error = vfs_fstatat(dfd, filename, &stat, flag);
 	if (error)
 		return error;
 	return cp_oldabi_stat64(&stat, statbuf);
 }

 struct oabi_flock64 {
 	short	l_type;
 	short	l_whence;
 	loff_t	l_start;
 	loff_t	l_len;
 	pid_t	l_pid;
 } __attribute__ ((packed,aligned(4)));

 static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
 {
 	struct oabi_flock64 user;

 	if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
 			   sizeof(user)))
 		return -EFAULT;

 	kernel->l_type	 = user.l_type;
 	kernel->l_whence = user.l_whence;
 	kernel->l_start	 = user.l_start;
 	kernel->l_len	 = user.l_len;
 	kernel->l_pid	 = user.l_pid;

 	return 0;
 }

 static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
 {
 	struct oabi_flock64 user;

 	user.l_type	= kernel->l_type;
 	user.l_whence	= kernel->l_whence;
 	user.l_start	= kernel->l_start;
 	user.l_len	= kernel->l_len;
 	user.l_pid	= kernel->l_pid;

 	if (copy_to_user((struct oabi_flock64 __user *)arg,
 			 &user, sizeof(user)))
 		return -EFAULT;

 	return 0;
 }

 asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
 				 unsigned long arg)
 {
 	void __user *argp = (void __user *)arg;
 	struct fd f = fdget_raw(fd);
 	struct flock64 flock;
 	long err = -EBADF;

 	if (!f.file)
 		goto out;

 	switch (cmd) {
 	case F_GETLK64:
 	case F_OFD_GETLK:
 		err = security_file_fcntl(f.file, cmd, arg);
 		if (err)
 			break;
 		err = get_oabi_flock(&flock, argp);
 		if (err)
 			break;
 		err = fcntl_getlk64(f.file, cmd, &flock);
 		if (!err)
 		       err = put_oabi_flock(&flock, argp);
 		break;
 	case F_SETLK64:
 	case F_SETLKW64:
 	case F_OFD_SETLK:
 	case F_OFD_SETLKW:
 		err = security_file_fcntl(f.file, cmd, arg);
 		if (err)
 			break;
 		err = get_oabi_flock(&flock, argp);
 		if (err)
 			break;
 		err = fcntl_setlk64(fd, f.file, cmd, &flock);
 		break;
 	default:
 		err = sys_fcntl64(fd, cmd, arg);
 		break;
 	}
 	fdput(f);
 out:
 	return err;
 }

 struct oabi_epoll_event {
 	__poll_t events;
 	__u64 data;
 } __attribute__ ((packed,aligned(4)));

 #ifdef CONFIG_EPOLL
 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
 				   struct oabi_epoll_event __user *event)
 {
 	struct oabi_epoll_event user;
 	struct epoll_event kernel;

 	if (ep_op_has_event(op) &&
 	    copy_from_user(&user, event, sizeof(user)))
 		return -EFAULT;

 	kernel.events = user.events;
 	kernel.data   = user.data;

 	return do_epoll_ctl(epfd, op, fd, &kernel, false);
 }
 #else
 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
 				   struct oabi_epoll_event __user *event)
 {
 	return -EINVAL;
 }
 #endif

 struct epoll_event __user *
 epoll_put_uevent(__poll_t revents, __u64 data,
 		 struct epoll_event __user *uevent)
 {
 	if (in_oabi_syscall()) {
 		struct oabi_epoll_event __user *oevent = (void __user *)uevent;

 		if (__put_user(revents, &oevent->events) ||
 		    __put_user(data, &oevent->data))
 			return NULL;

 		return (void __user *)(oevent+1);
 	}

 	if (__put_user(revents, &uevent->events) ||
 	    __put_user(data, &uevent->data))
 		return NULL;

 	return uevent+1;
 }

 struct oabi_sembuf {
 	unsigned short	sem_num;
 	short		sem_op;
 	short		sem_flg;
 	unsigned short	__pad;
 };

 #define sc_semopm     sem_ctls[2]

 #ifdef CONFIG_SYSVIPC
 asmlinkage long sys_oabi_semtimedop(int semid,
 				    struct oabi_sembuf __user *tsops,
 				    unsigned nsops,
 				    const struct old_timespec32 __user *timeout)
 {
 	struct ipc_namespace *ns;
 	struct sembuf *sops;
 	long err;
 	int i;

 	ns = current->nsproxy->ipc_ns;
 	if (nsops > ns->sc_semopm)
 		return -E2BIG;
 	if (nsops < 1 || nsops > SEMOPM)
 		return -EINVAL;
 	sops = kvmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
 	if (!sops)
 		return -ENOMEM;
 	err = 0;
 	for (i = 0; i < nsops; i++) {
 		struct oabi_sembuf osb;
 		err |= copy_from_user(&osb, tsops, sizeof(osb));
 		sops[i].sem_num = osb.sem_num;
 		sops[i].sem_op = osb.sem_op;
 		sops[i].sem_flg = osb.sem_flg;
 		tsops++;
 	}
 	if (err) {
 		err = -EFAULT;
 		goto out;
 	}

 	if (timeout) {
 		struct timespec64 ts;
 		err = get_old_timespec32(&ts, timeout);
 		if (err)
 			goto out;
 		err = __do_semtimedop(semid, sops, nsops, &ts, ns);
 		goto out;
 	}
 	err = __do_semtimedop(semid, sops, nsops, NULL, ns);
 out:
 	kvfree(sops);
 	return err;
 }

 asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
 			       unsigned nsops)
 {
 	return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
 }

 asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
 			    void __user *ptr, long fifth)
 {
 	switch (call & 0xffff) {
 	case SEMOP:
 		return  sys_oabi_semtimedop(first,
 					    (struct oabi_sembuf __user *)ptr,
 					    second, NULL);
 	case SEMTIMEDOP:
 		return  sys_oabi_semtimedop(first,
 					    (struct oabi_sembuf __user *)ptr,
 					    second,
 					    (const struct old_timespec32 __user *)fifth);
 	default:
 		return sys_ipc(call, first, second, third, ptr, fifth);
 	}
 }
 #else
 asmlinkage long sys_oabi_semtimedop(int semid,
 				    struct oabi_sembuf __user *tsops,
 				    unsigned nsops,
 				    const struct old_timespec32 __user *timeout)
 {
 	return -ENOSYS;
 }

 asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
 			       unsigned nsops)
 {
 	return -ENOSYS;
 }

 asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
 			    void __user *ptr, long fifth)
 {
 	return -ENOSYS;
 }
 #endif

 asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
 {
 	sa_family_t sa_family;
 	if (addrlen == 112 &&
 	    get_user(sa_family, &addr->sa_family) == 0 &&
 	    sa_family == AF_UNIX)
 			addrlen = 110;
 	return sys_bind(fd, addr, addrlen);
 }

 asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
 {
 	sa_family_t sa_family;
 	if (addrlen == 112 &&
 	    get_user(sa_family, &addr->sa_family) == 0 &&
 	    sa_family == AF_UNIX)
 			addrlen = 110;
 	return sys_connect(fd, addr, addrlen);
 }

 asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
 				size_t len, unsigned flags,
 				struct sockaddr __user *addr,
 				int addrlen)
 {
 	sa_family_t sa_family;
 	if (addrlen == 112 &&
 	    get_user(sa_family, &addr->sa_family) == 0 &&
 	    sa_family == AF_UNIX)
 			addrlen = 110;
 	return sys_sendto(fd, buff, len, flags, addr, addrlen);
 }

 asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
 {
 	struct sockaddr __user *addr;
 	int msg_namelen;
 	sa_family_t sa_family;
 	if (msg &&
 	    get_user(msg_namelen, &msg->msg_namelen) == 0 &&
 	    msg_namelen == 112 &&
 	    get_user(addr, &msg->msg_name) == 0 &&
 	    get_user(sa_family, &addr->sa_family) == 0 &&
 	    sa_family == AF_UNIX)
 	{
 		/*
 		 * HACK ALERT: there is a limit to how much backward bending
 		 * we should do for what is actually a transitional
 		 * compatibility layer.  This already has known flaws with
 		 * a few ioctls that we don't intend to fix.  Therefore
 		 * consider this blatent hack as another one... and take care
 		 * to run for cover.  In most cases it will "just work fine".
 		 * If it doesn't, well, tough.
 		 */
 		put_user(110, &msg->msg_namelen);
 	}
 	return sys_sendmsg(fd, msg, flags);
 }

 asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
 {
 	unsigned long r = -EFAULT, a[6];

 	switch (call) {
 	case SYS_BIND:
 		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
 			r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
 		break;
 	case SYS_CONNECT:
 		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
 			r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
 		break;
 	case SYS_SENDTO:
 		if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
 			r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
 					    (struct sockaddr __user *)a[4], a[5]);
 		break;
 	case SYS_SENDMSG:
 		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
 			r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
 		break;
 	default:
 		r = sys_socketcall(call, args);
 	}

 	return r;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* arch/arm/kernel/sys_oabi-compat.c
	*
	* Compatibility wrappers for syscalls that are used from
	* old ABI user space binaries with an EABI kernel.
	*
	* Author: Nicolas Pitre
	* Created: Oct 7, 2005
	* Copyright: MontaVista Software, Inc.
	*/

	/*
	* The legacy ABI and the new ARM EABI have different rules making some
	* syscalls incompatible especially with structure arguments.
	* Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
	* simply word aligned. EABI also pads structures to the size of the largest
	* member it contains instead of the invariant 32-bit.
	*
	* The following syscalls are affected:
	*
	* sys_stat64:
	* sys_lstat64:
	* sys_fstat64:
	* sys_fstatat64:
	*
	* struct stat64 has different sizes and some members are shifted
	* Compatibility wrappers are needed for them and provided below.
	*
	* sys_fcntl64:
	*
	* struct flock64 has different sizes and some members are shifted
	* A compatibility wrapper is needed and provided below.
	*
	* sys_statfs64:
	* sys_fstatfs64:
	*
	* struct statfs64 has extra padding with EABI growing its size from
	* 84 to 88. This struct is now __attribute__((packed,aligned(4)))
	* with a small assembly wrapper to force the sz argument to 84 if it is 88
	* to avoid copying the extra padding over user space unexpecting it.
	*
	* sys_newuname:
	*
	* struct new_utsname has no padding with EABI. No problem there.
	*
	* sys_epoll_ctl:
	* sys_epoll_wait:
	*
	* struct epoll_event has its second member shifted also affecting the
	* structure size. Compatibility wrappers are needed and provided below.
	*
	* sys_ipc:
	* sys_semop:
	* sys_semtimedop:
	*
	* struct sembuf loses its padding with EABI. Since arrays of them are
	* used they have to be copyed to remove the padding. Compatibility wrappers
	* provided below.
	*
	* sys_bind:
	* sys_connect:
	* sys_sendmsg:
	* sys_sendto:
	* sys_socketcall:
	*
	* struct sockaddr_un loses its padding with EABI. Since the size of the
	* structure is used as a validation test in unix_mkname(), we need to
	* change the length argument to 110 whenever it is 112. Compatibility
	* wrappers provided below.
	*/

	#include <linux/syscalls.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/cred.h>
	#include <linux/fcntl.h>
	#include <linux/eventpoll.h>
	#include <linux/sem.h>
	#include <linux/socket.h>
	#include <linux/net.h>
	#include <linux/ipc.h>
	#include <linux/ipc_namespace.h>
	#include <linux/uaccess.h>
	#include <linux/slab.h>

	#include <asm/syscall.h>

	struct oldabi_stat64 {
	unsigned long long st_dev;
	unsigned int __pad1;
	unsigned long __st_ino;
	unsigned int st_mode;
	unsigned int st_nlink;

	unsigned long st_uid;
	unsigned long st_gid;

	unsigned long long st_rdev;
	unsigned int __pad2;

	long long st_size;
	unsigned long st_blksize;
	unsigned long long st_blocks;

	unsigned long st_atime;
	unsigned long st_atime_nsec;

	unsigned long st_mtime;
	unsigned long st_mtime_nsec;

	unsigned long st_ctime;
	unsigned long st_ctime_nsec;

	unsigned long long st_ino;
	} __attribute__ ((packed,aligned(4)));

	static long cp_oldabi_stat64(struct kstat *stat,
	struct oldabi_stat64 __user *statbuf)
	{
	struct oldabi_stat64 tmp;

	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.__pad1 = 0;
	tmp.__st_ino = stat->ino;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
	tmp.st_size = stat->size;
	tmp.st_blocks = stat->blocks;
	tmp.__pad2 = 0;
	tmp.st_blksize = stat->blksize;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime = stat->ctime.tv_sec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	tmp.st_ino = stat->ino;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	}

	asmlinkage long sys_oabi_stat64(const char __user * filename,
	struct oldabi_stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);
	if (!error)
	error = cp_oldabi_stat64(&stat, statbuf);
	return error;
	}

	asmlinkage long sys_oabi_lstat64(const char __user * filename,
	struct oldabi_stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_lstat(filename, &stat);
	if (!error)
	error = cp_oldabi_stat64(&stat, statbuf);
	return error;
	}

	asmlinkage long sys_oabi_fstat64(unsigned long fd,
	struct oldabi_stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);
	if (!error)
	error = cp_oldabi_stat64(&stat, statbuf);
	return error;
	}

	asmlinkage long sys_oabi_fstatat64(int dfd,
	const char __user *filename,
	struct oldabi_stat64 __user *statbuf,
	int flag)
	{
	struct kstat stat;
	int error;

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
	return error;
	return cp_oldabi_stat64(&stat, statbuf);
	}

	struct oabi_flock64 {
	short l_type;
	short l_whence;
	loff_t l_start;
	loff_t l_len;
	pid_t l_pid;
	} __attribute__ ((packed,aligned(4)));

	static int get_oabi_flock(struct flock64 kernel, struct oabi_flock64 __user arg)
	{
	struct oabi_flock64 user;

	if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
	sizeof(user)))
	return -EFAULT;

	kernel->l_type = user.l_type;
	kernel->l_whence = user.l_whence;
	kernel->l_start = user.l_start;
	kernel->l_len = user.l_len;
	kernel->l_pid = user.l_pid;

	return 0;
	}

	static int put_oabi_flock(struct flock64 kernel, struct oabi_flock64 __user arg)
	{
	struct oabi_flock64 user;

	user.l_type = kernel->l_type;
	user.l_whence = kernel->l_whence;
	user.l_start = kernel->l_start;
	user.l_len = kernel->l_len;
	user.l_pid = kernel->l_pid;

	if (copy_to_user((struct oabi_flock64 __user *)arg,
	&user, sizeof(user)))
	return -EFAULT;

	return 0;
	}

	asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
	unsigned long arg)
	{
	void __user argp = (void __user )arg;
	struct fd f = fdget_raw(fd);
	struct flock64 flock;
	long err = -EBADF;

	if (!f.file)
	goto out;

	switch (cmd) {
	case F_GETLK64:
	case F_OFD_GETLK:
	err = security_file_fcntl(f.file, cmd, arg);
	if (err)
	break;
	err = get_oabi_flock(&flock, argp);
	if (err)
	break;
	err = fcntl_getlk64(f.file, cmd, &flock);
	if (!err)
	err = put_oabi_flock(&flock, argp);
	break;
	case F_SETLK64:
	case F_SETLKW64:
	case F_OFD_SETLK:
	case F_OFD_SETLKW:
	err = security_file_fcntl(f.file, cmd, arg);
	if (err)
	break;
	err = get_oabi_flock(&flock, argp);
	if (err)
	break;
	err = fcntl_setlk64(fd, f.file, cmd, &flock);
	break;
	default:
	err = sys_fcntl64(fd, cmd, arg);
	break;
	}
	fdput(f);
	out:
	return err;
	}

	struct oabi_epoll_event {
	__poll_t events;
	__u64 data;
	} __attribute__ ((packed,aligned(4)));

	#ifdef CONFIG_EPOLL
	asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
	struct oabi_epoll_event __user *event)
	{
	struct oabi_epoll_event user;
	struct epoll_event kernel;

	if (ep_op_has_event(op) &&
	copy_from_user(&user, event, sizeof(user)))
	return -EFAULT;

	kernel.events = user.events;
	kernel.data = user.data;

	return do_epoll_ctl(epfd, op, fd, &kernel, false);
	}
	#else
	asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
	struct oabi_epoll_event __user *event)
	{
	return -EINVAL;
	}
	#endif

	struct epoll_event __user *
	epoll_put_uevent(__poll_t revents, __u64 data,
	struct epoll_event __user *uevent)
	{
	if (in_oabi_syscall()) {
	struct oabi_epoll_event __user oevent = (void __user )uevent;

	if (__put_user(revents, &oevent->events) \|\|
	__put_user(data, &oevent->data))
	return NULL;

	return (void __user *)(oevent+1);
	}

	if (__put_user(revents, &uevent->events) \|\|
	__put_user(data, &uevent->data))
	return NULL;

	return uevent+1;
	}

	struct oabi_sembuf {
	unsigned short sem_num;
	short sem_op;
	short sem_flg;
	unsigned short __pad;
	};

	#define sc_semopm sem_ctls[2]

	#ifdef CONFIG_SYSVIPC
	asmlinkage long sys_oabi_semtimedop(int semid,
	struct oabi_sembuf __user *tsops,
	unsigned nsops,
	const struct old_timespec32 __user *timeout)
	{
	struct ipc_namespace *ns;
	struct sembuf *sops;
	long err;
	int i;

	ns = current->nsproxy->ipc_ns;
	if (nsops > ns->sc_semopm)
	return -E2BIG;
	if (nsops < 1 \|\| nsops > SEMOPM)
	return -EINVAL;
	sops = kvmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
	if (!sops)
	return -ENOMEM;
	err = 0;
	for (i = 0; i < nsops; i++) {
	struct oabi_sembuf osb;
	err \|= copy_from_user(&osb, tsops, sizeof(osb));
	sops[i].sem_num = osb.sem_num;
	sops[i].sem_op = osb.sem_op;
	sops[i].sem_flg = osb.sem_flg;
	tsops++;
	}
	if (err) {
	err = -EFAULT;
	goto out;
	}

	if (timeout) {
	struct timespec64 ts;
	err = get_old_timespec32(&ts, timeout);
	if (err)
	goto out;
	err = __do_semtimedop(semid, sops, nsops, &ts, ns);
	goto out;
	}
	err = __do_semtimedop(semid, sops, nsops, NULL, ns);
	out:
	kvfree(sops);
	return err;
	}

	asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
	unsigned nsops)
	{
	return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
	}

	asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
	void __user *ptr, long fifth)
	{
	switch (call & 0xffff) {
	case SEMOP:
	return sys_oabi_semtimedop(first,
	(struct oabi_sembuf __user *)ptr,
	second, NULL);
	case SEMTIMEDOP:
	return sys_oabi_semtimedop(first,
	(struct oabi_sembuf __user *)ptr,
	second,
	(const struct old_timespec32 __user *)fifth);
	default:
	return sys_ipc(call, first, second, third, ptr, fifth);
	}
	}
	#else
	asmlinkage long sys_oabi_semtimedop(int semid,
	struct oabi_sembuf __user *tsops,
	unsigned nsops,
	const struct old_timespec32 __user *timeout)
	{
	return -ENOSYS;
	}

	asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
	unsigned nsops)
	{
	return -ENOSYS;
	}

	asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
	void __user *ptr, long fifth)
	{
	return -ENOSYS;
	}
	#endif

	asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
	{
	sa_family_t sa_family;
	if (addrlen == 112 &&
	get_user(sa_family, &addr->sa_family) == 0 &&
	sa_family == AF_UNIX)
	addrlen = 110;
	return sys_bind(fd, addr, addrlen);
	}

	asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
	{
	sa_family_t sa_family;
	if (addrlen == 112 &&
	get_user(sa_family, &addr->sa_family) == 0 &&
	sa_family == AF_UNIX)
	addrlen = 110;
	return sys_connect(fd, addr, addrlen);
	}

	asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
	size_t len, unsigned flags,
	struct sockaddr __user *addr,
	int addrlen)
	{
	sa_family_t sa_family;
	if (addrlen == 112 &&
	get_user(sa_family, &addr->sa_family) == 0 &&
	sa_family == AF_UNIX)
	addrlen = 110;
	return sys_sendto(fd, buff, len, flags, addr, addrlen);
	}

	asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
	{
	struct sockaddr __user *addr;
	int msg_namelen;
	sa_family_t sa_family;
	if (msg &&
	get_user(msg_namelen, &msg->msg_namelen) == 0 &&
	msg_namelen == 112 &&
	get_user(addr, &msg->msg_name) == 0 &&
	get_user(sa_family, &addr->sa_family) == 0 &&
	sa_family == AF_UNIX)
	{
	/*
	* HACK ALERT: there is a limit to how much backward bending
	* we should do for what is actually a transitional
	* compatibility layer. This already has known flaws with
	* a few ioctls that we don't intend to fix. Therefore
	* consider this blatent hack as another one... and take care
	* to run for cover. In most cases it will "just work fine".
	* If it doesn't, well, tough.
	*/
	put_user(110, &msg->msg_namelen);
	}
	return sys_sendmsg(fd, msg, flags);
	}

	asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
	{
	unsigned long r = -EFAULT, a[6];

	switch (call) {
	case SYS_BIND:
	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
	break;
	case SYS_CONNECT:
	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
	break;
	case SYS_SENDTO:
	if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
	r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
	(struct sockaddr __user *)a[4], a[5]);
	break;
	case SYS_SENDMSG:
	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
	break;
	default:
	r = sys_socketcall(call, args);
	}

	return r;
	}