[people/arne_f/kernel.git] / arch / arm / kernel / sys_oabi-compat.c

/*
 *  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.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

/*
 * 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/fcntl.h>
#include <linux/eventpoll.h>
#include <linux/sem.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <linux/slab.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)));

asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
				 unsigned long arg)
{
	struct oabi_flock64 user;
	struct flock64 kernel;
	mm_segment_t fs = USER_DS; /* initialized to kill a warning */
	unsigned long local_arg = arg;
	int ret;

	switch (cmd) {
	case F_GETLK64:
	case F_SETLK64:
	case F_SETLKW64:
		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;
		local_arg = (unsigned long)&kernel;
		fs = get_fs();
		set_fs(KERNEL_DS);
	}

	ret = sys_fcntl64(fd, cmd, local_arg);

	switch (cmd) {
	case F_GETLK64:
		if (!ret) {
			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)))
				ret = -EFAULT;
		}
	case F_SETLK64:
	case F_SETLKW64:
		set_fs(fs);
	}

	return ret;
}

struct oabi_epoll_event {
	__u32 events;
	__u64 data;
} __attribute__ ((packed,aligned(4)));

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;
	mm_segment_t fs;
	long ret;

	if (op == EPOLL_CTL_DEL)
		return sys_epoll_ctl(epfd, op, fd, NULL);
	if (copy_from_user(&user, event, sizeof(user)))
		return -EFAULT;
	kernel.events = user.events;
	kernel.data   = user.data;
	fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_epoll_ctl(epfd, op, fd, &kernel);
	set_fs(fs);
	return ret;
}

asmlinkage long sys_oabi_epoll_wait(int epfd,
				    struct oabi_epoll_event __user *events,
				    int maxevents, int timeout)
{
	struct epoll_event *kbuf;
	mm_segment_t fs;
	long ret, err, i;

	if (maxevents <= 0 ||
			maxevents > (INT_MAX/sizeof(*kbuf)) ||
			maxevents > (INT_MAX/sizeof(*events)))
		return -EINVAL;
	if (!access_ok(VERIFY_WRITE, events, sizeof(*events) * maxevents))
		return -EFAULT;
	kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
	if (!kbuf)
		return -ENOMEM;
	fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
	set_fs(fs);
	err = 0;
	for (i = 0; i < ret; i++) {
		__put_user_error(kbuf[i].events, &events->events, err);
		__put_user_error(kbuf[i].data,   &events->data,   err);
		events++;
	}
	kfree(kbuf);
	return err ? -EFAULT : ret;
}

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

asmlinkage long sys_oabi_semtimedop(int semid,
				    struct oabi_sembuf __user *tsops,
				    unsigned nsops,
				    const struct timespec __user *timeout)
{
	struct sembuf *sops;
	struct timespec local_timeout;
	long err;
	int i;

	if (nsops < 1 || nsops > SEMOPM)
		return -EINVAL;
	if (!access_ok(VERIFY_READ, tsops, sizeof(*tsops) * nsops))
		return -EFAULT;
	sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
	if (!sops)
		return -ENOMEM;
	err = 0;
	for (i = 0; i < nsops; i++) {
		__get_user_error(sops[i].sem_num, &tsops->sem_num, err);
		__get_user_error(sops[i].sem_op,  &tsops->sem_op,  err);
		__get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
		tsops++;
	}
	if (timeout) {
		/* copy this as well before changing domain protection */
		err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
		timeout = &local_timeout;
	}
	if (err) {
		err = -EFAULT;
	} else {
		mm_segment_t fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_semtimedop(semid, sops, nsops, timeout);
		set_fs(fs);
	}
	kfree(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 timespec __user *)fifth);
	default:
		return sys_ipc(call, first, second, third, ptr, fifth);
	}
}

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 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 msghdr __user *)a[1], a[2]);
		break;
	default:
		r = sys_socketcall(call, args);
	}

	return r;
}
Commit	Line	Data
687ad019 NP	1	/*
	2	* arch/arm/kernel/sys_oabi-compat.c
	3	*
	4	* Compatibility wrappers for syscalls that are used from
	5	* old ABI user space binaries with an EABI kernel.
	6	*
	7	* Author: Nicolas Pitre
	8	* Created: Oct 7, 2005
	9	* Copyright: MontaVista Software, Inc.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	/*
	17	* The legacy ABI and the new ARM EABI have different rules making some
	18	* syscalls incompatible especially with structure arguments.
	19	* Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
	20	* simply word aligned. EABI also pads structures to the size of the largest
	21	* member it contains instead of the invariant 32-bit.
	22	*
	23	* The following syscalls are affected:
	24	*
	25	* sys_stat64:
	26	* sys_lstat64:
	27	* sys_fstat64:
c60afe10	28	* sys_fstatat64:
687ad019 NP	29	*
	30	* struct stat64 has different sizes and some members are shifted
	31	* Compatibility wrappers are needed for them and provided below.
	32	*
	33	* sys_fcntl64:
	34	*
	35	* struct flock64 has different sizes and some members are shifted
	36	* A compatibility wrapper is needed and provided below.
	37	*
	38	* sys_statfs64:
	39	* sys_fstatfs64:
	40	*
	41	* struct statfs64 has extra padding with EABI growing its size from
	42	* 84 to 88. This struct is now __attribute__((packed,aligned(4)))
	43	* with a small assembly wrapper to force the sz argument to 84 if it is 88
	44	* to avoid copying the extra padding over user space unexpecting it.
	45	*
	46	* sys_newuname:
	47	*
	48	* struct new_utsname has no padding with EABI. No problem there.
	49	*
	50	* sys_epoll_ctl:
	51	* sys_epoll_wait:
	52	*
	53	* struct epoll_event has its second member shifted also affecting the
	54	* structure size. Compatibility wrappers are needed and provided below.
	55	*
	56	* sys_ipc:
	57	* sys_semop:
	58	* sys_semtimedop:
	59	*
	60	* struct sembuf loses its padding with EABI. Since arrays of them are
	61	* used they have to be copyed to remove the padding. Compatibility wrappers
	62	* provided below.
99595d02 NP	63	*
	64	* sys_bind:
	65	* sys_connect:
	66	* sys_sendmsg:
	67	* sys_sendto:
6c0fa49b	68	* sys_socketcall:
99595d02 NP	69	*
	70	* struct sockaddr_un loses its padding with EABI. Since the size of the
	71	* structure is used as a validation test in unix_mkname(), we need to
	72	* change the length argument to 110 whenever it is 112. Compatibility
	73	* wrappers provided below.
687ad019 NP	74	*/
	75
	76	#include <linux/syscalls.h>
	77	#include <linux/errno.h>
	78	#include <linux/fs.h>
	79	#include <linux/fcntl.h>
	80	#include <linux/eventpoll.h>
	81	#include <linux/sem.h>
99595d02	82	#include <linux/socket.h>
6c0fa49b	83	#include <linux/net.h>
cba4fbbf	84	#include <linux/ipc.h>
33fa9b13	85	#include <linux/uaccess.h>
cbb55092	86	#include <linux/slab.h>
687ad019 NP	87
	88	struct oldabi_stat64 {
	89	unsigned long long st_dev;
	90	unsigned int __pad1;
	91	unsigned long __st_ino;
	92	unsigned int st_mode;
	93	unsigned int st_nlink;
	94
	95	unsigned long st_uid;
	96	unsigned long st_gid;
	97
	98	unsigned long long st_rdev;
	99	unsigned int __pad2;
	100
	101	long long st_size;
	102	unsigned long st_blksize;
	103	unsigned long long st_blocks;
	104
	105	unsigned long st_atime;
	106	unsigned long st_atime_nsec;
	107
	108	unsigned long st_mtime;
	109	unsigned long st_mtime_nsec;
	110
	111	unsigned long st_ctime;
	112	unsigned long st_ctime_nsec;
	113
	114	unsigned long long st_ino;
	115	} __attribute__ ((packed,aligned(4)));
	116
	117	static long cp_oldabi_stat64(struct kstat *stat,
	118	struct oldabi_stat64 __user *statbuf)
	119	{
	120	struct oldabi_stat64 tmp;
	121
	122	tmp.st_dev = huge_encode_dev(stat->dev);
	123	tmp.__pad1 = 0;
	124	tmp.__st_ino = stat->ino;
	125	tmp.st_mode = stat->mode;
	126	tmp.st_nlink = stat->nlink;
a7c1938e EB	127	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	128	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
687ad019 NP	129	tmp.st_rdev = huge_encode_dev(stat->rdev);
	130	tmp.st_size = stat->size;
	131	tmp.st_blocks = stat->blocks;
	132	tmp.__pad2 = 0;
	133	tmp.st_blksize = stat->blksize;
	134	tmp.st_atime = stat->atime.tv_sec;
	135	tmp.st_atime_nsec = stat->atime.tv_nsec;
	136	tmp.st_mtime = stat->mtime.tv_sec;
	137	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	138	tmp.st_ctime = stat->ctime.tv_sec;
	139	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	140	tmp.st_ino = stat->ino;
	141	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	142	}
	143
c7887325	144	asmlinkage long sys_oabi_stat64(const char __user * filename,
687ad019 NP	145	struct oldabi_stat64 __user * statbuf)
	146	{
	147	struct kstat stat;
	148	int error = vfs_stat(filename, &stat);
	149	if (!error)
	150	error = cp_oldabi_stat64(&stat, statbuf);
	151	return error;
	152	}
	153
c7887325	154	asmlinkage long sys_oabi_lstat64(const char __user * filename,
687ad019 NP	155	struct oldabi_stat64 __user * statbuf)
	156	{
	157	struct kstat stat;
	158	int error = vfs_lstat(filename, &stat);
	159	if (!error)
	160	error = cp_oldabi_stat64(&stat, statbuf);
	161	return error;
	162	}
	163
	164	asmlinkage long sys_oabi_fstat64(unsigned long fd,
	165	struct oldabi_stat64 __user * statbuf)
	166	{
	167	struct kstat stat;
	168	int error = vfs_fstat(fd, &stat);
	169	if (!error)
	170	error = cp_oldabi_stat64(&stat, statbuf);
	171	return error;
	172	}
	173
c60afe10	174	asmlinkage long sys_oabi_fstatat64(int dfd,
c7887325	175	const char __user *filename,
c60afe10 RV	176	struct oldabi_stat64 __user *statbuf,
	177	int flag)
	178	{
	179	struct kstat stat;
0112fc22	180	int error;
c60afe10	181
0112fc22 OD	182	error = vfs_fstatat(dfd, filename, &stat, flag);
	183	if (error)
	184	return error;
	185	return cp_oldabi_stat64(&stat, statbuf);
c60afe10 RV	186	}
c60afe10 RV	187
687ad019 NP	188	struct oabi_flock64 {
	189	short l_type;
	190	short l_whence;
	191	loff_t l_start;
	192	loff_t l_len;
	193	pid_t l_pid;
	194	} __attribute__ ((packed,aligned(4)));
	195
	196	asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
	197	unsigned long arg)
	198	{
	199	struct oabi_flock64 user;
	200	struct flock64 kernel;
	201	mm_segment_t fs = USER_DS; /* initialized to kill a warning */
	202	unsigned long local_arg = arg;
	203	int ret;
	204
	205	switch (cmd) {
	206	case F_GETLK64:
	207	case F_SETLK64:
	208	case F_SETLKW64:
	209	if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
	210	sizeof(user)))
	211	return -EFAULT;
	212	kernel.l_type = user.l_type;
	213	kernel.l_whence = user.l_whence;
	214	kernel.l_start = user.l_start;
	215	kernel.l_len = user.l_len;
	216	kernel.l_pid = user.l_pid;
	217	local_arg = (unsigned long)&kernel;
	218	fs = get_fs();
	219	set_fs(KERNEL_DS);
	220	}
	221
	222	ret = sys_fcntl64(fd, cmd, local_arg);
	223
	224	switch (cmd) {
	225	case F_GETLK64:
	226	if (!ret) {
	227	user.l_type = kernel.l_type;
	228	user.l_whence = kernel.l_whence;
	229	user.l_start = kernel.l_start;
	230	user.l_len = kernel.l_len;
	231	user.l_pid = kernel.l_pid;
	232	if (copy_to_user((struct oabi_flock64 __user *)arg,
	233	&user, sizeof(user)))
	234	ret = -EFAULT;
	235	}
	236	case F_SETLK64:
	237	case F_SETLKW64:
	238	set_fs(fs);
	239	}
	240
	241	return ret;
	242	}
	243
	244	struct oabi_epoll_event {
	245	__u32 events;
	246	__u64 data;
	247	} __attribute__ ((packed,aligned(4)));
	248
	249	asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
	250	struct oabi_epoll_event __user *event)
	251	{
252	struct oabi_epoll_event user;
253	struct epoll_event kernel;
254	mm_segment_t fs;
255	long ret;
256
257	if (op == EPOLL_CTL_DEL)
258	return sys_epoll_ctl(epfd, op, fd, NULL);
259	if (copy_from_user(&user, event, sizeof(user)))
260	return -EFAULT;
261	kernel.events = user.events;
262	kernel.data = user.data;
263	fs = get_fs();
264	set_fs(KERNEL_DS);
265	ret = sys_epoll_ctl(epfd, op, fd, &kernel);
266	set_fs(fs);
267	return ret;
268	}
269
270	asmlinkage long sys_oabi_epoll_wait(int epfd,
271	struct oabi_epoll_event __user *events,
272	int maxevents, int timeout)
273	{
274	struct epoll_event *kbuf;
275	mm_segment_t fs;
276	long ret, err, i;
277
e380a271 DW	278	if (maxevents <= 0 \|\|
	279	maxevents > (INT_MAX/sizeof(*kbuf)) \|\|
	280	maxevents > (INT_MAX/sizeof(*events)))
687ad019	281	return -EINVAL;
e380a271 DW	282	if (!access_ok(VERIFY_WRITE, events, sizeof(events) maxevents))
e380a271 DW	283	return -EFAULT;
687ad019 NP	284	kbuf = kmalloc(sizeof(kbuf) maxevents, GFP_KERNEL);
	285	if (!kbuf)
	286	return -ENOMEM;
	287	fs = get_fs();
	288	set_fs(KERNEL_DS);
	289	ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
	290	set_fs(fs);
	291	err = 0;
	292	for (i = 0; i < ret; i++) {
	293	__put_user_error(kbuf[i].events, &events->events, err);
	294	__put_user_error(kbuf[i].data, &events->data, err);
	295	events++;
	296	}
	297	kfree(kbuf);
	298	return err ? -EFAULT : ret;
	299	}
	300
	301	struct oabi_sembuf {
	302	unsigned short sem_num;
	303	short sem_op;
	304	short sem_flg;
	305	unsigned short __pad;
	306	};
	307
	308	asmlinkage long sys_oabi_semtimedop(int semid,
	309	struct oabi_sembuf __user *tsops,
	310	unsigned nsops,
	311	const struct timespec __user *timeout)
	312	{
	313	struct sembuf *sops;
	314	struct timespec local_timeout;
	315	long err;
	316	int i;
	317
0f22072a	318	if (nsops < 1 \|\| nsops > SEMOPM)
687ad019	319	return -EINVAL;
e380a271 DW	320	if (!access_ok(VERIFY_READ, tsops, sizeof(tsops) nsops))
e380a271 DW	321	return -EFAULT;
687ad019 NP	322	sops = kmalloc(sizeof(sops) nsops, GFP_KERNEL);
	323	if (!sops)
	324	return -ENOMEM;
	325	err = 0;
	326	for (i = 0; i < nsops; i++) {
	327	__get_user_error(sops[i].sem_num, &tsops->sem_num, err);
	328	__get_user_error(sops[i].sem_op, &tsops->sem_op, err);
	329	__get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
	330	tsops++;
	331	}
	332	if (timeout) {
	333	/* copy this as well before changing domain protection */
	334	err \|= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
	335	timeout = &local_timeout;
	336	}
	337	if (err) {
	338	err = -EFAULT;
	339	} else {
	340	mm_segment_t fs = get_fs();
	341	set_fs(KERNEL_DS);
	342	err = sys_semtimedop(semid, sops, nsops, timeout);
	343	set_fs(fs);
	344	}
	345	kfree(sops);
	346	return err;
	347	}
	348
	349	asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
	350	unsigned nsops)
	351	{
	352	return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
	353	}
	354
687ad019 NP	355	asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
	356	void __user *ptr, long fifth)
	357	{
	358	switch (call & 0xffff) {
	359	case SEMOP:
	360	return sys_oabi_semtimedop(first,
	361	(struct oabi_sembuf __user *)ptr,
	362	second, NULL);
	363	case SEMTIMEDOP:
	364	return sys_oabi_semtimedop(first,
	365	(struct oabi_sembuf __user *)ptr,
	366	second,
	367	(const struct timespec __user *)fifth);
	368	default:
	369	return sys_ipc(call, first, second, third, ptr, fifth);
	370	}
	371	}
99595d02 NP	372
	373	asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
	374	{
	375	sa_family_t sa_family;
	376	if (addrlen == 112 &&
	377	get_user(sa_family, &addr->sa_family) == 0 &&
	378	sa_family == AF_UNIX)
	379	addrlen = 110;
	380	return sys_bind(fd, addr, addrlen);
	381	}
	382
	383	asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
	384	{
	385	sa_family_t sa_family;
	386	if (addrlen == 112 &&
	387	get_user(sa_family, &addr->sa_family) == 0 &&
	388	sa_family == AF_UNIX)
	389	addrlen = 110;
	390	return sys_connect(fd, addr, addrlen);
	391	}
	392
	393	asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
	394	size_t len, unsigned flags,
	395	struct sockaddr __user *addr,
	396	int addrlen)
	397	{
	398	sa_family_t sa_family;
	399	if (addrlen == 112 &&
	400	get_user(sa_family, &addr->sa_family) == 0 &&
	401	sa_family == AF_UNIX)
	402	addrlen = 110;
	403	return sys_sendto(fd, buff, len, flags, addr, addrlen);
	404	}
	405
	406	asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
	407	{
	408	struct sockaddr __user *addr;
	409	int msg_namelen;
	410	sa_family_t sa_family;
	411	if (msg &&
	412	get_user(msg_namelen, &msg->msg_namelen) == 0 &&
	413	msg_namelen == 112 &&
	414	get_user(addr, &msg->msg_name) == 0 &&
	415	get_user(sa_family, &addr->sa_family) == 0 &&
	416	sa_family == AF_UNIX)
	417	{
	418	/*
	419	* HACK ALERT: there is a limit to how much backward bending
	420	* we should do for what is actually a transitional
	421	* compatibility layer. This already has known flaws with
	422	* a few ioctls that we don't intend to fix. Therefore
	423	* consider this blatent hack as another one... and take care
	424	* to run for cover. In most cases it will "just work fine".
	425	* If it doesn't, well, tough.
	426	*/
	427	put_user(110, &msg->msg_namelen);
	428	}
	429	return sys_sendmsg(fd, msg, flags);
	430	}
	431
6c0fa49b NP	432	asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
	433	{
	434	unsigned long r = -EFAULT, a[6];
	435
	436	switch (call) {
	437	case SYS_BIND:
	438	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	439	r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
	440	break;
	441	case SYS_CONNECT:
	442	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	443	r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
	444	break;
	445	case SYS_SENDTO:
	446	if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
	447	r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
	448	(struct sockaddr __user *)a[4], a[5]);
	449	break;
	450	case SYS_SENDMSG:
	451	if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
	452	r = sys_oabi_sendmsg(a[0], (struct msghdr __user *)a[1], a[2]);
	453	break;
	454	default:
	455	r = sys_socketcall(call, args);
	456	}
	457
	458	return r;
	459	}