ipc/compat.c - kernel/msm-4.9 - Gitiles

 /*
  * 32 bit compatibility code for System V IPC
  *
  * Copyright (C) 1997,1998	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  * Copyright (C) 1997		David S. Miller (davem@caip.rutgers.edu)
  * Copyright (C) 1999		Arun Sharma <arun.sharma@intel.com>
  * Copyright (C) 2000		VA Linux Co
  * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
  * Copyright (C) 2000           Hewlett-Packard Co.
  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
  * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
  * Copyright (C) 2000		Silicon Graphics, Inc.
  * Copyright (C) 2001		IBM
  * Copyright (C) 2004		IBM Deutschland Entwicklung GmbH, IBM Corporation
  * Copyright (C) 2004		Arnd Bergmann (arnd@arndb.de)
  *
  * This code is collected from the versions for sparc64, mips64, s390x, ia64,
  * ppc64 and x86_64, all of which are based on the original sparc64 version
  * by Jakub Jelinek.
  *
  */
 #include <linux/compat.h>
 #include <linux/errno.h>
 #include <linux/highuid.h>
 #include <linux/init.h>
 #include <linux/msg.h>
 #include <linux/shm.h>
 #include <linux/syscalls.h>
 #include <linux/ptrace.h>

 #include <linux/mutex.h>
 #include <asm/uaccess.h>

 #include "util.h"

 struct compat_msgbuf {
 	compat_long_t mtype;
 	char mtext[1];
 };

 struct compat_ipc_perm {
 	key_t key;
 	__compat_uid_t uid;
 	__compat_gid_t gid;
 	__compat_uid_t cuid;
 	__compat_gid_t cgid;
 	compat_mode_t mode;
 	unsigned short seq;
 };

 struct compat_semid_ds {
 	struct compat_ipc_perm sem_perm;
 	compat_time_t sem_otime;
 	compat_time_t sem_ctime;
 	compat_uptr_t sem_base;
 	compat_uptr_t sem_pending;
 	compat_uptr_t sem_pending_last;
 	compat_uptr_t undo;
 	unsigned short sem_nsems;
 };

 struct compat_msqid_ds {
 	struct compat_ipc_perm msg_perm;
 	compat_uptr_t msg_first;
 	compat_uptr_t msg_last;
 	compat_time_t msg_stime;
 	compat_time_t msg_rtime;
 	compat_time_t msg_ctime;
 	compat_ulong_t msg_lcbytes;
 	compat_ulong_t msg_lqbytes;
 	unsigned short msg_cbytes;
 	unsigned short msg_qnum;
 	unsigned short msg_qbytes;
 	compat_ipc_pid_t msg_lspid;
 	compat_ipc_pid_t msg_lrpid;
 };

 struct compat_shmid_ds {
 	struct compat_ipc_perm shm_perm;
 	int shm_segsz;
 	compat_time_t shm_atime;
 	compat_time_t shm_dtime;
 	compat_time_t shm_ctime;
 	compat_ipc_pid_t shm_cpid;
 	compat_ipc_pid_t shm_lpid;
 	unsigned short shm_nattch;
 	unsigned short shm_unused;
 	compat_uptr_t shm_unused2;
 	compat_uptr_t shm_unused3;
 };

 struct compat_ipc_kludge {
 	compat_uptr_t msgp;
 	compat_long_t msgtyp;
 };

 struct compat_shminfo64 {
 	compat_ulong_t shmmax;
 	compat_ulong_t shmmin;
 	compat_ulong_t shmmni;
 	compat_ulong_t shmseg;
 	compat_ulong_t shmall;
 	compat_ulong_t __unused1;
 	compat_ulong_t __unused2;
 	compat_ulong_t __unused3;
 	compat_ulong_t __unused4;
 };

 struct compat_shm_info {
 	compat_int_t used_ids;
 	compat_ulong_t shm_tot, shm_rss, shm_swp;
 	compat_ulong_t swap_attempts, swap_successes;
 };

 extern int sem_ctls[];
 #define sc_semopm	(sem_ctls[2])

 static inline int compat_ipc_parse_version(int *cmd)
 {
 #ifdef	CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 	int version = *cmd & IPC_64;

 	/* this is tricky: architectures that have support for the old
 	 * ipc structures in 64 bit binaries need to have IPC_64 set
 	 * in cmd, the others need to have it cleared */
 #ifndef ipc_parse_version
 	*cmd |= IPC_64;
 #else
 	*cmd &= ~IPC_64;
 #endif
 	return version;
 #else
 	/* With the asm-generic APIs, we always use the 64-bit versions. */
 	return IPC_64;
 #endif
 }

 static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
 					  struct compat_ipc64_perm __user *up64)
 {
 	int err;

 	err  = __get_user(p64->uid, &up64->uid);
 	err |= __get_user(p64->gid, &up64->gid);
 	err |= __get_user(p64->mode, &up64->mode);
 	return err;
 }

 static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
 					struct compat_ipc_perm __user *up)
 {
 	int err;

 	err  = __get_user(p->uid, &up->uid);
 	err |= __get_user(p->gid, &up->gid);
 	err |= __get_user(p->mode, &up->mode);
 	return err;
 }

 static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
 					  struct compat_ipc64_perm __user *up64)
 {
 	int err;

 	err  = __put_user(p64->key, &up64->key);
 	err |= __put_user(p64->uid, &up64->uid);
 	err |= __put_user(p64->gid, &up64->gid);
 	err |= __put_user(p64->cuid, &up64->cuid);
 	err |= __put_user(p64->cgid, &up64->cgid);
 	err |= __put_user(p64->mode, &up64->mode);
 	err |= __put_user(p64->seq, &up64->seq);
 	return err;
 }

 static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
 					struct compat_ipc_perm __user *up)
 {
 	int err;
 	__compat_uid_t u;
 	__compat_gid_t g;

 	err  = __put_user(p->key, &up->key);
 	SET_UID(u, p->uid);
 	err |= __put_user(u, &up->uid);
 	SET_GID(g, p->gid);
 	err |= __put_user(g, &up->gid);
 	SET_UID(u, p->cuid);
 	err |= __put_user(u, &up->cuid);
 	SET_GID(g, p->cgid);
 	err |= __put_user(g, &up->cgid);
 	err |= __put_user(p->mode, &up->mode);
 	err |= __put_user(p->seq, &up->seq);
 	return err;
 }

 static inline int get_compat_semid64_ds(struct semid64_ds *s64,
 					struct compat_semid64_ds __user *up64)
 {
 	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 		return -EFAULT;
 	return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 }

 static inline int get_compat_semid_ds(struct semid64_ds *s,
 				      struct compat_semid_ds __user *up)
 {
 	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 		return -EFAULT;
 	return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 }

 static inline int put_compat_semid64_ds(struct semid64_ds *s64,
 					struct compat_semid64_ds __user *up64)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
 	err  = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
 	err |= __put_user(s64->sem_otime, &up64->sem_otime);
 	err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
 	err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
 	return err;
 }

 static inline int put_compat_semid_ds(struct semid64_ds *s,
 				      struct compat_semid_ds __user *up)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
 	err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
 	err |= __put_user(s->sem_otime, &up->sem_otime);
 	err |= __put_user(s->sem_ctime, &up->sem_ctime);
 	err |= __put_user(s->sem_nsems, &up->sem_nsems);
 	return err;
 }

 static long do_compat_semctl(int first, int second, int third, u32 pad)
 {
 	unsigned long fourth;
 	int err, err2;
 	struct semid64_ds s64;
 	struct semid64_ds __user *up64;
 	int version = compat_ipc_parse_version(&third);

 	memset(&s64, 0, sizeof(s64));

 	if ((third & (~IPC_64)) == SETVAL)
 #ifdef __BIG_ENDIAN
 		fourth = (unsigned long)pad << 32;
 #else
 		fourth = pad;
 #endif
 	else
 		fourth = (unsigned long)compat_ptr(pad);
 	switch (third & (~IPC_64)) {
 	case IPC_INFO:
 	case IPC_RMID:
 	case SEM_INFO:
 	case GETVAL:
 	case GETPID:
 	case GETNCNT:
 	case GETZCNT:
 	case GETALL:
 	case SETVAL:
 	case SETALL:
 		err = sys_semctl(first, second, third, fourth);
 		break;

 	case IPC_STAT:
 	case SEM_STAT:
 		up64 = compat_alloc_user_space(sizeof(s64));
 		fourth = (unsigned long)up64;
 		err = sys_semctl(first, second, third, fourth);
 		if (err < 0)
 			break;
 		if (copy_from_user(&s64, up64, sizeof(s64)))
 			err2 = -EFAULT;
 		else if (version == IPC_64)
 			err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
 		else
 			err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
 		if (err2)
 			err = -EFAULT;
 		break;

 	case IPC_SET:
 		if (version == IPC_64)
 			err = get_compat_semid64_ds(&s64, compat_ptr(pad));
 		else
 			err = get_compat_semid_ds(&s64, compat_ptr(pad));

 		up64 = compat_alloc_user_space(sizeof(s64));
 		if (copy_to_user(up64, &s64, sizeof(s64)))
 			err = -EFAULT;
 		if (err)
 			break;

 		fourth = (unsigned long)up64;
 		err = sys_semctl(first, second, third, fourth);
 		break;

 	default:
 		err = -EINVAL;
 		break;
 	}
 	return err;
 }

 static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
 {
 	struct compat_msgbuf __user *msgp = dest;
 	size_t msgsz;

 	if (put_user(msg->m_type, &msgp->mtype))
 		return -EFAULT;

 	msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
 	if (store_msg(msgp->mtext, msg, msgsz))
 		return -EFAULT;
 	return msgsz;
 }

 #ifndef COMPAT_SHMLBA
 #define COMPAT_SHMLBA	SHMLBA
 #endif

 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
 COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
 	u32, third, compat_uptr_t, ptr, u32, fifth)
 {
 	int version;
 	u32 pad;

 	version = call >> 16; /* hack for backward compatibility */
 	call &= 0xffff;

 	switch (call) {
 	case SEMOP:
 		/* struct sembuf is the same on 32 and 64bit :)) */
 		return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 	case SEMTIMEDOP:
 		return compat_sys_semtimedop(first, compat_ptr(ptr), second,
 						compat_ptr(fifth));
 	case SEMGET:
 		return sys_semget(first, second, third);
 	case SEMCTL:
 		if (!ptr)
 			return -EINVAL;
 		if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
 			return -EFAULT;
 		return do_compat_semctl(first, second, third, pad);

 	case MSGSND: {
 		struct compat_msgbuf __user *up = compat_ptr(ptr);
 		compat_long_t type;

 		if (first < 0 || second < 0)
 			return -EINVAL;

 		if (get_user(type, &up->mtype))
 			return -EFAULT;

 		return do_msgsnd(first, type, up->mtext, second, third);
 	}
 	case MSGRCV: {
 		void __user *uptr = compat_ptr(ptr);

 		if (first < 0 || second < 0)
 			return -EINVAL;

 		if (!version) {
 			struct compat_ipc_kludge ipck;
 			if (!uptr)
 				return -EINVAL;
 			if (copy_from_user(&ipck, uptr, sizeof(ipck)))
 				return -EFAULT;
 			uptr = compat_ptr(ipck.msgp);
 			fifth = ipck.msgtyp;
 		}
 		return do_msgrcv(first, uptr, second, (s32)fifth, third,
 				 compat_do_msg_fill);
 	}
 	case MSGGET:
 		return sys_msgget(first, second);
 	case MSGCTL:
 		return compat_sys_msgctl(first, second, compat_ptr(ptr));

 	case SHMAT: {
 		int err;
 		unsigned long raddr;

 		if (version == 1)
 			return -EINVAL;
 		err = do_shmat(first, compat_ptr(ptr), second, &raddr,
 			       COMPAT_SHMLBA);
 		if (err < 0)
 			return err;
 		return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
 	}
 	case SHMDT:
 		return sys_shmdt(compat_ptr(ptr));
 	case SHMGET:
 		return sys_shmget(first, (unsigned)second, third);
 	case SHMCTL:
 		return compat_sys_shmctl(first, second, compat_ptr(ptr));
 	}

 	return -ENOSYS;
 }
 #endif

 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
 {
 	return do_compat_semctl(semid, semnum, cmd, arg);
 }

 COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
 		       compat_ssize_t, msgsz, int, msgflg)
 {
 	struct compat_msgbuf __user *up = compat_ptr(msgp);
 	compat_long_t mtype;

 	if (get_user(mtype, &up->mtype))
 		return -EFAULT;
 	return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
 }

 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
 		       compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
 {
 	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
 			 msgflg, compat_do_msg_fill);
 }

 static inline int get_compat_msqid64(struct msqid64_ds *m64,
 				     struct compat_msqid64_ds __user *up64)
 {
 	int err;

 	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 		return -EFAULT;
 	err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 	err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
 	return err;
 }

 static inline int get_compat_msqid(struct msqid64_ds *m,
 				   struct compat_msqid_ds __user *up)
 {
 	int err;

 	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 		return -EFAULT;
 	err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 	err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
 	return err;
 }

 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
 				 struct compat_msqid64_ds __user *up64)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
 	err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
 	err |= __put_user(m64->msg_stime, &up64->msg_stime);
 	err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
 	err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
 	err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
 	err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
 	err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
 	err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
 	err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
 	return err;
 }

 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
 				      struct compat_msqid_ds __user *up)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
 	err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
 	err |= __put_user(m->msg_stime, &up->msg_stime);
 	err |= __put_user(m->msg_rtime, &up->msg_rtime);
 	err |= __put_user(m->msg_ctime, &up->msg_ctime);
 	err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
 	err |= __put_user(m->msg_qnum, &up->msg_qnum);
 	err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
 	err |= __put_user(m->msg_lspid, &up->msg_lspid);
 	err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
 	return err;
 }

 COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
 {
 	int err, err2;
 	struct msqid64_ds m64;
 	int version = compat_ipc_parse_version(&second);
 	void __user *p;

 	memset(&m64, 0, sizeof(m64));

 	switch (second & (~IPC_64)) {
 	case IPC_INFO:
 	case IPC_RMID:
 	case MSG_INFO:
 		err = sys_msgctl(first, second, uptr);
 		break;

 	case IPC_SET:
 		if (version == IPC_64)
 			err = get_compat_msqid64(&m64, uptr);
 		else
 			err = get_compat_msqid(&m64, uptr);

 		if (err)
 			break;
 		p = compat_alloc_user_space(sizeof(m64));
 		if (copy_to_user(p, &m64, sizeof(m64)))
 			err = -EFAULT;
 		else
 			err = sys_msgctl(first, second, p);
 		break;

 	case IPC_STAT:
 	case MSG_STAT:
 		p = compat_alloc_user_space(sizeof(m64));
 		err = sys_msgctl(first, second, p);
 		if (err < 0)
 			break;
 		if (copy_from_user(&m64, p, sizeof(m64)))
 			err2 = -EFAULT;
 		else if (version == IPC_64)
 			err2 = put_compat_msqid64_ds(&m64, uptr);
 		else
 			err2 = put_compat_msqid_ds(&m64, uptr);
 		if (err2)
 			err = -EFAULT;
 		break;

 	default:
 		err = -EINVAL;
 		break;
 	}
 	return err;
 }

 COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
 {
 	unsigned long ret;
 	long err;

 	err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
 	if (err)
 		return err;
 	force_successful_syscall_return();
 	return (long)ret;
 }

 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
 					struct compat_shmid64_ds __user *up64)
 {
 	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
 		return -EFAULT;
 	return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 }

 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
 				      struct compat_shmid_ds __user *up)
 {
 	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
 		return -EFAULT;
 	return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 }

 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
 					struct compat_shmid64_ds __user *up64)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
 	err  = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
 	err |= __put_user(s64->shm_atime, &up64->shm_atime);
 	err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
 	err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
 	err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
 	err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
 	err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
 	err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
 	return err;
 }

 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
 				      struct compat_shmid_ds __user *up)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
 	err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
 	err |= __put_user(s->shm_atime, &up->shm_atime);
 	err |= __put_user(s->shm_dtime, &up->shm_dtime);
 	err |= __put_user(s->shm_ctime, &up->shm_ctime);
 	err |= __put_user(s->shm_segsz, &up->shm_segsz);
 	err |= __put_user(s->shm_nattch, &up->shm_nattch);
 	err |= __put_user(s->shm_cpid, &up->shm_cpid);
 	err |= __put_user(s->shm_lpid, &up->shm_lpid);
 	return err;
 }

 static inline int put_compat_shminfo64(struct shminfo64 *smi,
 				       struct compat_shminfo64 __user *up64)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
 	if (smi->shmmax > INT_MAX)
 		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up64->shmmax);
 	err |= __put_user(smi->shmmin, &up64->shmmin);
 	err |= __put_user(smi->shmmni, &up64->shmmni);
 	err |= __put_user(smi->shmseg, &up64->shmseg);
 	err |= __put_user(smi->shmall, &up64->shmall);
 	return err;
 }

 static inline int put_compat_shminfo(struct shminfo64 *smi,
 				     struct shminfo __user *up)
 {
 	int err;

 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
 	if (smi->shmmax > INT_MAX)
 		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up->shmmax);
 	err |= __put_user(smi->shmmin, &up->shmmin);
 	err |= __put_user(smi->shmmni, &up->shmmni);
 	err |= __put_user(smi->shmseg, &up->shmseg);
 	err |= __put_user(smi->shmall, &up->shmall);
 	return err;
 }

 static inline int put_compat_shm_info(struct shm_info __user *ip,
 				      struct compat_shm_info __user *uip)
 {
 	int err;
 	struct shm_info si;

 	if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
 	    copy_from_user(&si, ip, sizeof(si)))
 		return -EFAULT;
 	err  = __put_user(si.used_ids, &uip->used_ids);
 	err |= __put_user(si.shm_tot, &uip->shm_tot);
 	err |= __put_user(si.shm_rss, &uip->shm_rss);
 	err |= __put_user(si.shm_swp, &uip->shm_swp);
 	err |= __put_user(si.swap_attempts, &uip->swap_attempts);
 	err |= __put_user(si.swap_successes, &uip->swap_successes);
 	return err;
 }

 COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
 {
 	void __user *p;
 	struct shmid64_ds s64;
 	struct shminfo64 smi;
 	int err, err2;
 	int version = compat_ipc_parse_version(&second);

 	memset(&s64, 0, sizeof(s64));

 	switch (second & (~IPC_64)) {
 	case IPC_RMID:
 	case SHM_LOCK:
 	case SHM_UNLOCK:
 		err = sys_shmctl(first, second, uptr);
 		break;

 	case IPC_INFO:
 		p = compat_alloc_user_space(sizeof(smi));
 		err = sys_shmctl(first, second, p);
 		if (err < 0)
 			break;
 		if (copy_from_user(&smi, p, sizeof(smi)))
 			err2 = -EFAULT;
 		else if (version == IPC_64)
 			err2 = put_compat_shminfo64(&smi, uptr);
 		else
 			err2 = put_compat_shminfo(&smi, uptr);
 		if (err2)
 			err = -EFAULT;
 		break;


 	case IPC_SET:
 		if (version == IPC_64)
 			err = get_compat_shmid64_ds(&s64, uptr);
 		else
 			err = get_compat_shmid_ds(&s64, uptr);

 		if (err)
 			break;
 		p = compat_alloc_user_space(sizeof(s64));
 		if (copy_to_user(p, &s64, sizeof(s64)))
 			err = -EFAULT;
 		else
 			err = sys_shmctl(first, second, p);
 		break;

 	case IPC_STAT:
 	case SHM_STAT:
 		p = compat_alloc_user_space(sizeof(s64));
 		err = sys_shmctl(first, second, p);
 		if (err < 0)
 			break;
 		if (copy_from_user(&s64, p, sizeof(s64)))
 			err2 = -EFAULT;
 		else if (version == IPC_64)
 			err2 = put_compat_shmid64_ds(&s64, uptr);
 		else
 			err2 = put_compat_shmid_ds(&s64, uptr);
 		if (err2)
 			err = -EFAULT;
 		break;

 	case SHM_INFO:
 		p = compat_alloc_user_space(sizeof(struct shm_info));
 		err = sys_shmctl(first, second, p);
 		if (err < 0)
 			break;
 		err2 = put_compat_shm_info(p, uptr);
 		if (err2)
 			err = -EFAULT;
 		break;

 	default:
 		err = -EINVAL;
 		break;
 	}
 	return err;
 }

 COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
 		       unsigned, nsops,
 		       const struct compat_timespec __user *, timeout)
 {
 	struct timespec __user *ts64;
 	if (compat_convert_timespec(&ts64, timeout))
 		return -EFAULT;
 	return sys_semtimedop(semid, tsems, nsops, ts64);
 }
	/*
	* 32 bit compatibility code for System V IPC
	*
	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
	* Copyright (C) 2000 VA Linux Co
	* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
	* Copyright (C) 2000 Hewlett-Packard Co.
	* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
	* Copyright (C) 2000 Gerhard Tonn (ton@de.ibm.com)
	* Copyright (C) 2000-2002 Andi Kleen, SuSE Labs (x86-64 port)
	* Copyright (C) 2000 Silicon Graphics, Inc.
	* Copyright (C) 2001 IBM
	* Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
	* Copyright (C) 2004 Arnd Bergmann (arnd@arndb.de)
	*
	* This code is collected from the versions for sparc64, mips64, s390x, ia64,
	* ppc64 and x86_64, all of which are based on the original sparc64 version
	* by Jakub Jelinek.
	*
	*/
	#include <linux/compat.h>
	#include <linux/errno.h>
	#include <linux/highuid.h>
	#include <linux/init.h>
	#include <linux/msg.h>
	#include <linux/shm.h>
	#include <linux/syscalls.h>
	#include <linux/ptrace.h>

	#include <linux/mutex.h>
	#include <asm/uaccess.h>

	#include "util.h"

	struct compat_msgbuf {
	compat_long_t mtype;
	char mtext[1];
	};

	struct compat_ipc_perm {
	key_t key;
	__compat_uid_t uid;
	__compat_gid_t gid;
	__compat_uid_t cuid;
	__compat_gid_t cgid;
	compat_mode_t mode;
	unsigned short seq;
	};

	struct compat_semid_ds {
	struct compat_ipc_perm sem_perm;
	compat_time_t sem_otime;
	compat_time_t sem_ctime;
	compat_uptr_t sem_base;
	compat_uptr_t sem_pending;
	compat_uptr_t sem_pending_last;
	compat_uptr_t undo;
	unsigned short sem_nsems;
	};

	struct compat_msqid_ds {
	struct compat_ipc_perm msg_perm;
	compat_uptr_t msg_first;
	compat_uptr_t msg_last;
	compat_time_t msg_stime;
	compat_time_t msg_rtime;
	compat_time_t msg_ctime;
	compat_ulong_t msg_lcbytes;
	compat_ulong_t msg_lqbytes;
	unsigned short msg_cbytes;
	unsigned short msg_qnum;
	unsigned short msg_qbytes;
	compat_ipc_pid_t msg_lspid;
	compat_ipc_pid_t msg_lrpid;
	};

	struct compat_shmid_ds {
	struct compat_ipc_perm shm_perm;
	int shm_segsz;
	compat_time_t shm_atime;
	compat_time_t shm_dtime;
	compat_time_t shm_ctime;
	compat_ipc_pid_t shm_cpid;
	compat_ipc_pid_t shm_lpid;
	unsigned short shm_nattch;
	unsigned short shm_unused;
	compat_uptr_t shm_unused2;
	compat_uptr_t shm_unused3;
	};

	struct compat_ipc_kludge {
	compat_uptr_t msgp;
	compat_long_t msgtyp;
	};

	struct compat_shminfo64 {
	compat_ulong_t shmmax;
	compat_ulong_t shmmin;
	compat_ulong_t shmmni;
	compat_ulong_t shmseg;
	compat_ulong_t shmall;
	compat_ulong_t __unused1;
	compat_ulong_t __unused2;
	compat_ulong_t __unused3;
	compat_ulong_t __unused4;
	};

	struct compat_shm_info {
	compat_int_t used_ids;
	compat_ulong_t shm_tot, shm_rss, shm_swp;
	compat_ulong_t swap_attempts, swap_successes;
	};

	extern int sem_ctls[];
	#define sc_semopm (sem_ctls[2])

	static inline int compat_ipc_parse_version(int *cmd)
	{
	#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	int version = *cmd & IPC_64;

	/* this is tricky: architectures that have support for the old
	* ipc structures in 64 bit binaries need to have IPC_64 set
	* in cmd, the others need to have it cleared */
	#ifndef ipc_parse_version
	*cmd \|= IPC_64;
	#else
	*cmd &= ~IPC_64;
	#endif
	return version;
	#else
	/* With the asm-generic APIs, we always use the 64-bit versions. */
	return IPC_64;
	#endif
	}

	static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
	struct compat_ipc64_perm __user *up64)
	{
	int err;

	err = __get_user(p64->uid, &up64->uid);
	err \|= __get_user(p64->gid, &up64->gid);
	err \|= __get_user(p64->mode, &up64->mode);
	return err;
	}

	static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
	struct compat_ipc_perm __user *up)
	{
	int err;

	err = __get_user(p->uid, &up->uid);
	err \|= __get_user(p->gid, &up->gid);
	err \|= __get_user(p->mode, &up->mode);
	return err;
	}

	static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
	struct compat_ipc64_perm __user *up64)
	{
	int err;

	err = __put_user(p64->key, &up64->key);
	err \|= __put_user(p64->uid, &up64->uid);
	err \|= __put_user(p64->gid, &up64->gid);
	err \|= __put_user(p64->cuid, &up64->cuid);
	err \|= __put_user(p64->cgid, &up64->cgid);
	err \|= __put_user(p64->mode, &up64->mode);
	err \|= __put_user(p64->seq, &up64->seq);
	return err;
	}

	static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
	struct compat_ipc_perm __user *up)
	{
	int err;
	__compat_uid_t u;
	__compat_gid_t g;

	err = __put_user(p->key, &up->key);
	SET_UID(u, p->uid);
	err \|= __put_user(u, &up->uid);
	SET_GID(g, p->gid);
	err \|= __put_user(g, &up->gid);
	SET_UID(u, p->cuid);
	err \|= __put_user(u, &up->cuid);
	SET_GID(g, p->cgid);
	err \|= __put_user(g, &up->cgid);
	err \|= __put_user(p->mode, &up->mode);
	err \|= __put_user(p->seq, &up->seq);
	return err;
	}

	static inline int get_compat_semid64_ds(struct semid64_ds *s64,
	struct compat_semid64_ds __user *up64)
	{
	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
	return -EFAULT;
	return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
	}

	static inline int get_compat_semid_ds(struct semid64_ds *s,
	struct compat_semid_ds __user *up)
	{
	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
	return -EFAULT;
	return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
	}

	static inline int put_compat_semid64_ds(struct semid64_ds *s64,
	struct compat_semid64_ds __user *up64)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
	return -EFAULT;
	err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
	err \|= __put_user(s64->sem_otime, &up64->sem_otime);
	err \|= __put_user(s64->sem_ctime, &up64->sem_ctime);
	err \|= __put_user(s64->sem_nsems, &up64->sem_nsems);
	return err;
	}

	static inline int put_compat_semid_ds(struct semid64_ds *s,
	struct compat_semid_ds __user *up)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
	return -EFAULT;
	err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
	err \|= __put_user(s->sem_otime, &up->sem_otime);
	err \|= __put_user(s->sem_ctime, &up->sem_ctime);
	err \|= __put_user(s->sem_nsems, &up->sem_nsems);
	return err;
	}

	static long do_compat_semctl(int first, int second, int third, u32 pad)
	{
	unsigned long fourth;
	int err, err2;
	struct semid64_ds s64;
	struct semid64_ds __user *up64;
	int version = compat_ipc_parse_version(&third);

	memset(&s64, 0, sizeof(s64));

	if ((third & (~IPC_64)) == SETVAL)
	#ifdef __BIG_ENDIAN
	fourth = (unsigned long)pad << 32;
	#else
	fourth = pad;
	#endif
	else
	fourth = (unsigned long)compat_ptr(pad);
	switch (third & (~IPC_64)) {
	case IPC_INFO:
	case IPC_RMID:
	case SEM_INFO:
	case GETVAL:
	case GETPID:
	case GETNCNT:
	case GETZCNT:
	case GETALL:
	case SETVAL:
	case SETALL:
	err = sys_semctl(first, second, third, fourth);
	break;

	case IPC_STAT:
	case SEM_STAT:
	up64 = compat_alloc_user_space(sizeof(s64));
	fourth = (unsigned long)up64;
	err = sys_semctl(first, second, third, fourth);
	if (err < 0)
	break;
	if (copy_from_user(&s64, up64, sizeof(s64)))
	err2 = -EFAULT;
	else if (version == IPC_64)
	err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
	else
	err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
	if (err2)
	err = -EFAULT;
	break;

	case IPC_SET:
	if (version == IPC_64)
	err = get_compat_semid64_ds(&s64, compat_ptr(pad));
	else
	err = get_compat_semid_ds(&s64, compat_ptr(pad));

	up64 = compat_alloc_user_space(sizeof(s64));
	if (copy_to_user(up64, &s64, sizeof(s64)))
	err = -EFAULT;
	if (err)
	break;

	fourth = (unsigned long)up64;
	err = sys_semctl(first, second, third, fourth);
	break;

	default:
	err = -EINVAL;
	break;
	}
	return err;
	}

	static long compat_do_msg_fill(void __user dest, struct msg_msg msg, size_t bufsz)
	{
	struct compat_msgbuf __user *msgp = dest;
	size_t msgsz;

	if (put_user(msg->m_type, &msgp->mtype))
	return -EFAULT;

	msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
	if (store_msg(msgp->mtext, msg, msgsz))
	return -EFAULT;
	return msgsz;
	}

	#ifndef COMPAT_SHMLBA
	#define COMPAT_SHMLBA SHMLBA
	#endif

	#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
	COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	u32, third, compat_uptr_t, ptr, u32, fifth)
	{
	int version;
	u32 pad;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	switch (call) {
	case SEMOP:
	/* struct sembuf is the same on 32 and 64bit :)) */
	return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
	case SEMTIMEDOP:
	return compat_sys_semtimedop(first, compat_ptr(ptr), second,
	compat_ptr(fifth));
	case SEMGET:
	return sys_semget(first, second, third);
	case SEMCTL:
	if (!ptr)
	return -EINVAL;
	if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
	return -EFAULT;
	return do_compat_semctl(first, second, third, pad);

	case MSGSND: {
	struct compat_msgbuf __user *up = compat_ptr(ptr);
	compat_long_t type;

	if (first < 0 \|\| second < 0)
	return -EINVAL;

	if (get_user(type, &up->mtype))
	return -EFAULT;

	return do_msgsnd(first, type, up->mtext, second, third);
	}
	case MSGRCV: {
	void __user *uptr = compat_ptr(ptr);

	if (first < 0 \|\| second < 0)
	return -EINVAL;

	if (!version) {
	struct compat_ipc_kludge ipck;
	if (!uptr)
	return -EINVAL;
	if (copy_from_user(&ipck, uptr, sizeof(ipck)))
	return -EFAULT;
	uptr = compat_ptr(ipck.msgp);
	fifth = ipck.msgtyp;
	}
	return do_msgrcv(first, uptr, second, (s32)fifth, third,
	compat_do_msg_fill);
	}
	case MSGGET:
	return sys_msgget(first, second);
	case MSGCTL:
	return compat_sys_msgctl(first, second, compat_ptr(ptr));

	case SHMAT: {
	int err;
	unsigned long raddr;

	if (version == 1)
	return -EINVAL;
	err = do_shmat(first, compat_ptr(ptr), second, &raddr,
	COMPAT_SHMLBA);
	if (err < 0)
	return err;
	return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
	}
	case SHMDT:
	return sys_shmdt(compat_ptr(ptr));
	case SHMGET:
	return sys_shmget(first, (unsigned)second, third);
	case SHMCTL:
	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	}

	return -ENOSYS;
	}
	#endif

	COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
	{
	return do_compat_semctl(semid, semnum, cmd, arg);
	}

	COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
	compat_ssize_t, msgsz, int, msgflg)
	{
	struct compat_msgbuf __user *up = compat_ptr(msgp);
	compat_long_t mtype;

	if (get_user(mtype, &up->mtype))
	return -EFAULT;
	return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
	}

	COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
	compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
	{
	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
	msgflg, compat_do_msg_fill);
	}

	static inline int get_compat_msqid64(struct msqid64_ds *m64,
	struct compat_msqid64_ds __user *up64)
	{
	int err;

	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
	return -EFAULT;
	err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
	err \|= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
	return err;
	}

	static inline int get_compat_msqid(struct msqid64_ds *m,
	struct compat_msqid_ds __user *up)
	{
	int err;

	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
	return -EFAULT;
	err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
	err \|= __get_user(m->msg_qbytes, &up->msg_qbytes);
	return err;
	}

	static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
	struct compat_msqid64_ds __user *up64)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
	return -EFAULT;
	err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
	err \|= __put_user(m64->msg_stime, &up64->msg_stime);
	err \|= __put_user(m64->msg_rtime, &up64->msg_rtime);
	err \|= __put_user(m64->msg_ctime, &up64->msg_ctime);
	err \|= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
	err \|= __put_user(m64->msg_qnum, &up64->msg_qnum);
	err \|= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
	err \|= __put_user(m64->msg_lspid, &up64->msg_lspid);
	err \|= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
	return err;
	}

	static inline int put_compat_msqid_ds(struct msqid64_ds *m,
	struct compat_msqid_ds __user *up)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
	return -EFAULT;
	err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
	err \|= __put_user(m->msg_stime, &up->msg_stime);
	err \|= __put_user(m->msg_rtime, &up->msg_rtime);
	err \|= __put_user(m->msg_ctime, &up->msg_ctime);
	err \|= __put_user(m->msg_cbytes, &up->msg_cbytes);
	err \|= __put_user(m->msg_qnum, &up->msg_qnum);
	err \|= __put_user(m->msg_qbytes, &up->msg_qbytes);
	err \|= __put_user(m->msg_lspid, &up->msg_lspid);
	err \|= __put_user(m->msg_lrpid, &up->msg_lrpid);
	return err;
	}

	COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
	{
	int err, err2;
	struct msqid64_ds m64;
	int version = compat_ipc_parse_version(&second);
	void __user *p;

	memset(&m64, 0, sizeof(m64));

	switch (second & (~IPC_64)) {
	case IPC_INFO:
	case IPC_RMID:
	case MSG_INFO:
	err = sys_msgctl(first, second, uptr);
	break;

	case IPC_SET:
	if (version == IPC_64)
	err = get_compat_msqid64(&m64, uptr);
	else
	err = get_compat_msqid(&m64, uptr);

	if (err)
	break;
	p = compat_alloc_user_space(sizeof(m64));
	if (copy_to_user(p, &m64, sizeof(m64)))
	err = -EFAULT;
	else
	err = sys_msgctl(first, second, p);
	break;

	case IPC_STAT:
	case MSG_STAT:
	p = compat_alloc_user_space(sizeof(m64));
	err = sys_msgctl(first, second, p);
	if (err < 0)
	break;
	if (copy_from_user(&m64, p, sizeof(m64)))
	err2 = -EFAULT;
	else if (version == IPC_64)
	err2 = put_compat_msqid64_ds(&m64, uptr);
	else
	err2 = put_compat_msqid_ds(&m64, uptr);
	if (err2)
	err = -EFAULT;
	break;

	default:
	err = -EINVAL;
	break;
	}
	return err;
	}

	COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
	{
	unsigned long ret;
	long err;

	err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
	if (err)
	return err;
	force_successful_syscall_return();
	return (long)ret;
	}

	static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
	struct compat_shmid64_ds __user *up64)
	{
	if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
	return -EFAULT;
	return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
	}

	static inline int get_compat_shmid_ds(struct shmid64_ds *s,
	struct compat_shmid_ds __user *up)
	{
	if (!access_ok(VERIFY_READ, up, sizeof(*up)))
	return -EFAULT;
	return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
	}

	static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
	struct compat_shmid64_ds __user *up64)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
	return -EFAULT;
	err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
	err \|= __put_user(s64->shm_atime, &up64->shm_atime);
	err \|= __put_user(s64->shm_dtime, &up64->shm_dtime);
	err \|= __put_user(s64->shm_ctime, &up64->shm_ctime);
	err \|= __put_user(s64->shm_segsz, &up64->shm_segsz);
	err \|= __put_user(s64->shm_nattch, &up64->shm_nattch);
	err \|= __put_user(s64->shm_cpid, &up64->shm_cpid);
	err \|= __put_user(s64->shm_lpid, &up64->shm_lpid);
	return err;
	}

	static inline int put_compat_shmid_ds(struct shmid64_ds *s,
	struct compat_shmid_ds __user *up)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
	return -EFAULT;
	err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
	err \|= __put_user(s->shm_atime, &up->shm_atime);
	err \|= __put_user(s->shm_dtime, &up->shm_dtime);
	err \|= __put_user(s->shm_ctime, &up->shm_ctime);
	err \|= __put_user(s->shm_segsz, &up->shm_segsz);
	err \|= __put_user(s->shm_nattch, &up->shm_nattch);
	err \|= __put_user(s->shm_cpid, &up->shm_cpid);
	err \|= __put_user(s->shm_lpid, &up->shm_lpid);
	return err;
	}

	static inline int put_compat_shminfo64(struct shminfo64 *smi,
	struct compat_shminfo64 __user *up64)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
	return -EFAULT;
	if (smi->shmmax > INT_MAX)
	smi->shmmax = INT_MAX;
	err = __put_user(smi->shmmax, &up64->shmmax);
	err \|= __put_user(smi->shmmin, &up64->shmmin);
	err \|= __put_user(smi->shmmni, &up64->shmmni);
	err \|= __put_user(smi->shmseg, &up64->shmseg);
	err \|= __put_user(smi->shmall, &up64->shmall);
	return err;
	}

	static inline int put_compat_shminfo(struct shminfo64 *smi,
	struct shminfo __user *up)
	{
	int err;

	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
	return -EFAULT;
	if (smi->shmmax > INT_MAX)
	smi->shmmax = INT_MAX;
	err = __put_user(smi->shmmax, &up->shmmax);
	err \|= __put_user(smi->shmmin, &up->shmmin);
	err \|= __put_user(smi->shmmni, &up->shmmni);
	err \|= __put_user(smi->shmseg, &up->shmseg);
	err \|= __put_user(smi->shmall, &up->shmall);
	return err;
	}

	static inline int put_compat_shm_info(struct shm_info __user *ip,
	struct compat_shm_info __user *uip)
	{
	int err;
	struct shm_info si;

	if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) \|\|
	copy_from_user(&si, ip, sizeof(si)))
	return -EFAULT;
	err = __put_user(si.used_ids, &uip->used_ids);
	err \|= __put_user(si.shm_tot, &uip->shm_tot);
	err \|= __put_user(si.shm_rss, &uip->shm_rss);
	err \|= __put_user(si.shm_swp, &uip->shm_swp);
	err \|= __put_user(si.swap_attempts, &uip->swap_attempts);
	err \|= __put_user(si.swap_successes, &uip->swap_successes);
	return err;
	}

	COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
	{
	void __user *p;
	struct shmid64_ds s64;
	struct shminfo64 smi;
	int err, err2;
	int version = compat_ipc_parse_version(&second);

	memset(&s64, 0, sizeof(s64));

	switch (second & (~IPC_64)) {
	case IPC_RMID:
	case SHM_LOCK:
	case SHM_UNLOCK:
	err = sys_shmctl(first, second, uptr);
	break;

	case IPC_INFO:
	p = compat_alloc_user_space(sizeof(smi));
	err = sys_shmctl(first, second, p);
	if (err < 0)
	break;
	if (copy_from_user(&smi, p, sizeof(smi)))
	err2 = -EFAULT;
	else if (version == IPC_64)
	err2 = put_compat_shminfo64(&smi, uptr);
	else
	err2 = put_compat_shminfo(&smi, uptr);
	if (err2)
	err = -EFAULT;
	break;


	case IPC_SET:
	if (version == IPC_64)
	err = get_compat_shmid64_ds(&s64, uptr);
	else
	err = get_compat_shmid_ds(&s64, uptr);

	if (err)
	break;
	p = compat_alloc_user_space(sizeof(s64));
	if (copy_to_user(p, &s64, sizeof(s64)))
	err = -EFAULT;
	else
	err = sys_shmctl(first, second, p);
	break;

	case IPC_STAT:
	case SHM_STAT:
	p = compat_alloc_user_space(sizeof(s64));
	err = sys_shmctl(first, second, p);
	if (err < 0)
	break;
	if (copy_from_user(&s64, p, sizeof(s64)))
	err2 = -EFAULT;
	else if (version == IPC_64)
	err2 = put_compat_shmid64_ds(&s64, uptr);
	else
	err2 = put_compat_shmid_ds(&s64, uptr);
	if (err2)
	err = -EFAULT;
	break;

	case SHM_INFO:
	p = compat_alloc_user_space(sizeof(struct shm_info));
	err = sys_shmctl(first, second, p);
	if (err < 0)
	break;
	err2 = put_compat_shm_info(p, uptr);
	if (err2)
	err = -EFAULT;
	break;

	default:
	err = -EINVAL;
	break;
	}
	return err;
	}

	COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
	unsigned, nsops,
	const struct compat_timespec __user *, timeout)
	{
	struct timespec __user *ts64;
	if (compat_convert_timespec(&ts64, timeout))
	return -EFAULT;
	return sys_semtimedop(semid, tsems, nsops, ts64);
	}