FreeBSD/Linux Kernel Cross Reference
sys/fs/compat.c

     /*
      *  linux/fs/compat.c
      *
      *  Kernel compatibililty routines for e.g. 32 bit syscall support
      *  on 64 bit kernels.
      *
      *  Copyright (C) 2002       Stephen Rothwell, IBM Corporation
      *  Copyright (C) 1997-2000  Jakub Jelinek  (jakub@redhat.com)
      *  Copyright (C) 1998       Eddie C. Dost  (ecd@skynet.be)
     *  Copyright (C) 2001,2002  Andi Kleen, SuSE Labs 
     *  Copyright (C) 2003       Pavel Machek (pavel@ucw.cz)
     *
     *  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.
     */
    
    #include <linux/stddef.h>
    #include <linux/kernel.h>
    #include <linux/linkage.h>
    #include <linux/compat.h>
    #include <linux/errno.h>
    #include <linux/time.h>
    #include <linux/fs.h>
    #include <linux/fcntl.h>
    #include <linux/namei.h>
    #include <linux/file.h>
    #include <linux/fdtable.h>
    #include <linux/vfs.h>
    #include <linux/ioctl.h>
    #include <linux/init.h>
    #include <linux/ncp_mount.h>
    #include <linux/nfs4_mount.h>
    #include <linux/syscalls.h>
    #include <linux/ctype.h>
    #include <linux/dirent.h>
    #include <linux/fsnotify.h>
    #include <linux/highuid.h>
    #include <linux/personality.h>
    #include <linux/rwsem.h>
    #include <linux/tsacct_kern.h>
    #include <linux/security.h>
    #include <linux/highmem.h>
    #include <linux/signal.h>
    #include <linux/poll.h>
    #include <linux/mm.h>
    #include <linux/eventpoll.h>
    #include <linux/fs_struct.h>
    #include <linux/slab.h>
    #include <linux/pagemap.h>
    
    #include <asm/uaccess.h>
    #include <asm/mmu_context.h>
    #include <asm/ioctls.h>
    #include "internal.h"
    
    int compat_log = 1;
    
    int compat_printk(const char *fmt, ...)
    {
            va_list ap;
            int ret;
            if (!compat_log)
                    return 0;
            va_start(ap, fmt);
            ret = vprintk(fmt, ap);
            va_end(ap);
            return ret;
    }
    
    #include "read_write.h"
    
    /*
     * Not all architectures have sys_utime, so implement this in terms
     * of sys_utimes.
     */
    asmlinkage long compat_sys_utime(const char __user *filename,
                                     struct compat_utimbuf __user *t)
    {
            struct timespec tv[2];
    
            if (t) {
                    if (get_user(tv[0].tv_sec, &t->actime) ||
                        get_user(tv[1].tv_sec, &t->modtime))
                            return -EFAULT;
                    tv[0].tv_nsec = 0;
                    tv[1].tv_nsec = 0;
            }
            return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
    }
    
    asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
    {
            struct timespec tv[2];
    
            if  (t) {
                    if (get_compat_timespec(&tv[0], &t[0]) ||
                        get_compat_timespec(&tv[1], &t[1]))
                            return -EFAULT;
   
                   if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
                           return 0;
           }
           return do_utimes(dfd, filename, t ? tv : NULL, flags);
   }
   
   asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
   {
           struct timespec tv[2];
   
           if (t) {
                   if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
                       get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
                       get_user(tv[1].tv_sec, &t[1].tv_sec) ||
                       get_user(tv[1].tv_nsec, &t[1].tv_usec))
                           return -EFAULT;
                   if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
                       tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
                           return -EINVAL;
                   tv[0].tv_nsec *= 1000;
                   tv[1].tv_nsec *= 1000;
           }
           return do_utimes(dfd, filename, t ? tv : NULL, 0);
   }
   
   asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
   {
           return compat_sys_futimesat(AT_FDCWD, filename, t);
   }
   
   static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
   {
           struct compat_stat tmp;
   
           if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
                   return -EOVERFLOW;
   
           memset(&tmp, 0, sizeof(tmp));
           tmp.st_dev = old_encode_dev(stat->dev);
           tmp.st_ino = stat->ino;
           if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
                   return -EOVERFLOW;
           tmp.st_mode = stat->mode;
           tmp.st_nlink = stat->nlink;
           if (tmp.st_nlink != stat->nlink)
                   return -EOVERFLOW;
           SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
           SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
           tmp.st_rdev = old_encode_dev(stat->rdev);
           if ((u64) stat->size > MAX_NON_LFS)
                   return -EOVERFLOW;
           tmp.st_size = stat->size;
           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_blocks = stat->blocks;
           tmp.st_blksize = stat->blksize;
           return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
   }
   
   asmlinkage long compat_sys_newstat(const char __user * filename,
                   struct compat_stat __user *statbuf)
   {
           struct kstat stat;
           int error;
   
           error = vfs_stat(filename, &stat);
           if (error)
                   return error;
           return cp_compat_stat(&stat, statbuf);
   }
   
   asmlinkage long compat_sys_newlstat(const char __user * filename,
                   struct compat_stat __user *statbuf)
   {
           struct kstat stat;
           int error;
   
           error = vfs_lstat(filename, &stat);
           if (error)
                   return error;
           return cp_compat_stat(&stat, statbuf);
   }
   
   #ifndef __ARCH_WANT_STAT64
   asmlinkage long compat_sys_newfstatat(unsigned int dfd,
                   const char __user *filename,
                   struct compat_stat __user *statbuf, int flag)
   {
           struct kstat stat;
           int error;
   
           error = vfs_fstatat(dfd, filename, &stat, flag);
           if (error)
                   return error;
           return cp_compat_stat(&stat, statbuf);
   }
   #endif
   
   asmlinkage long compat_sys_newfstat(unsigned int fd,
                   struct compat_stat __user * statbuf)
   {
           struct kstat stat;
           int error = vfs_fstat(fd, &stat);
   
           if (!error)
                   error = cp_compat_stat(&stat, statbuf);
           return error;
   }
   
   static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
   {
           
           if (sizeof ubuf->f_blocks == 4) {
                   if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
                        kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
                           return -EOVERFLOW;
                   /* f_files and f_ffree may be -1; it's okay
                    * to stuff that into 32 bits */
                   if (kbuf->f_files != 0xffffffffffffffffULL
                    && (kbuf->f_files & 0xffffffff00000000ULL))
                           return -EOVERFLOW;
                   if (kbuf->f_ffree != 0xffffffffffffffffULL
                    && (kbuf->f_ffree & 0xffffffff00000000ULL))
                           return -EOVERFLOW;
           }
           if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
               __put_user(kbuf->f_type, &ubuf->f_type) ||
               __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
               __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
               __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
               __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
               __put_user(kbuf->f_files, &ubuf->f_files) ||
               __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
               __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
               __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
               __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
               __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
               __put_user(kbuf->f_flags, &ubuf->f_flags) ||
               __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
                   return -EFAULT;
           return 0;
   }
   
   /*
    * The following statfs calls are copies of code from fs/statfs.c and
    * should be checked against those from time to time
    */
   asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
   {
           struct kstatfs tmp;
           int error = user_statfs(pathname, &tmp);
           if (!error)
                   error = put_compat_statfs(buf, &tmp);
           return error;
   }
   
   asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
   {
           struct kstatfs tmp;
           int error = fd_statfs(fd, &tmp);
           if (!error)
                   error = put_compat_statfs(buf, &tmp);
           return error;
   }
   
   static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
   {
           if (sizeof ubuf->f_blocks == 4) {
                   if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
                        kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
                           return -EOVERFLOW;
                   /* f_files and f_ffree may be -1; it's okay
                    * to stuff that into 32 bits */
                   if (kbuf->f_files != 0xffffffffffffffffULL
                    && (kbuf->f_files & 0xffffffff00000000ULL))
                           return -EOVERFLOW;
                   if (kbuf->f_ffree != 0xffffffffffffffffULL
                    && (kbuf->f_ffree & 0xffffffff00000000ULL))
                           return -EOVERFLOW;
           }
           if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
               __put_user(kbuf->f_type, &ubuf->f_type) ||
               __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
               __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
               __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
               __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
               __put_user(kbuf->f_files, &ubuf->f_files) ||
               __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
               __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
               __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
               __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
               __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
               __put_user(kbuf->f_flags, &ubuf->f_flags) ||
               __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
                   return -EFAULT;
           return 0;
   }
   
   asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
   {
           struct kstatfs tmp;
           int error;
   
           if (sz != sizeof(*buf))
                   return -EINVAL;
   
           error = user_statfs(pathname, &tmp);
           if (!error)
                   error = put_compat_statfs64(buf, &tmp);
           return error;
   }
   
   asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
   {
           struct kstatfs tmp;
           int error;
   
           if (sz != sizeof(*buf))
                   return -EINVAL;
   
           error = fd_statfs(fd, &tmp);
           if (!error)
                   error = put_compat_statfs64(buf, &tmp);
           return error;
   }
   
   /*
    * This is a copy of sys_ustat, just dealing with a structure layout.
    * Given how simple this syscall is that apporach is more maintainable
    * than the various conversion hacks.
    */
   asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
   {
           struct compat_ustat tmp;
           struct kstatfs sbuf;
           int err = vfs_ustat(new_decode_dev(dev), &sbuf);
           if (err)
                   return err;
   
           memset(&tmp, 0, sizeof(struct compat_ustat));
           tmp.f_tfree = sbuf.f_bfree;
           tmp.f_tinode = sbuf.f_ffree;
           if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
                   return -EFAULT;
           return 0;
   }
   
   static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
   {
           if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
               __get_user(kfl->l_type, &ufl->l_type) ||
               __get_user(kfl->l_whence, &ufl->l_whence) ||
               __get_user(kfl->l_start, &ufl->l_start) ||
               __get_user(kfl->l_len, &ufl->l_len) ||
               __get_user(kfl->l_pid, &ufl->l_pid))
                   return -EFAULT;
           return 0;
   }
   
   static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
   {
           if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
               __put_user(kfl->l_type, &ufl->l_type) ||
               __put_user(kfl->l_whence, &ufl->l_whence) ||
               __put_user(kfl->l_start, &ufl->l_start) ||
               __put_user(kfl->l_len, &ufl->l_len) ||
               __put_user(kfl->l_pid, &ufl->l_pid))
                   return -EFAULT;
           return 0;
   }
   
   #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
   static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
   {
           if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
               __get_user(kfl->l_type, &ufl->l_type) ||
               __get_user(kfl->l_whence, &ufl->l_whence) ||
               __get_user(kfl->l_start, &ufl->l_start) ||
               __get_user(kfl->l_len, &ufl->l_len) ||
               __get_user(kfl->l_pid, &ufl->l_pid))
                   return -EFAULT;
           return 0;
   }
   #endif
   
   #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
   static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
   {
           if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
               __put_user(kfl->l_type, &ufl->l_type) ||
               __put_user(kfl->l_whence, &ufl->l_whence) ||
               __put_user(kfl->l_start, &ufl->l_start) ||
               __put_user(kfl->l_len, &ufl->l_len) ||
               __put_user(kfl->l_pid, &ufl->l_pid))
                   return -EFAULT;
           return 0;
   }
   #endif
   
   asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
                   unsigned long arg)
   {
           mm_segment_t old_fs;
           struct flock f;
           long ret;
   
           switch (cmd) {
           case F_GETLK:
           case F_SETLK:
           case F_SETLKW:
                   ret = get_compat_flock(&f, compat_ptr(arg));
                   if (ret != 0)
                           break;
                   old_fs = get_fs();
                   set_fs(KERNEL_DS);
                   ret = sys_fcntl(fd, cmd, (unsigned long)&f);
                   set_fs(old_fs);
                   if (cmd == F_GETLK && ret == 0) {
                           /* GETLK was successful and we need to return the data...
                            * but it needs to fit in the compat structure.
                            * l_start shouldn't be too big, unless the original
                            * start + end is greater than COMPAT_OFF_T_MAX, in which
                            * case the app was asking for trouble, so we return
                            * -EOVERFLOW in that case.
                            * l_len could be too big, in which case we just truncate it,
                            * and only allow the app to see that part of the conflicting
                            * lock that might make sense to it anyway
                            */
   
                           if (f.l_start > COMPAT_OFF_T_MAX)
                                   ret = -EOVERFLOW;
                           if (f.l_len > COMPAT_OFF_T_MAX)
                                   f.l_len = COMPAT_OFF_T_MAX;
                           if (ret == 0)
                                   ret = put_compat_flock(&f, compat_ptr(arg));
                   }
                   break;
   
           case F_GETLK64:
           case F_SETLK64:
           case F_SETLKW64:
                   ret = get_compat_flock64(&f, compat_ptr(arg));
                   if (ret != 0)
                           break;
                   old_fs = get_fs();
                   set_fs(KERNEL_DS);
                   ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
                                   ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
                                   (unsigned long)&f);
                   set_fs(old_fs);
                   if (cmd == F_GETLK64 && ret == 0) {
                           /* need to return lock information - see above for commentary */
                           if (f.l_start > COMPAT_LOFF_T_MAX)
                                   ret = -EOVERFLOW;
                           if (f.l_len > COMPAT_LOFF_T_MAX)
                                   f.l_len = COMPAT_LOFF_T_MAX;
                           if (ret == 0)
                                   ret = put_compat_flock64(&f, compat_ptr(arg));
                   }
                   break;
   
           default:
                   ret = sys_fcntl(fd, cmd, arg);
                   break;
           }
           return ret;
   }
   
   asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
                   unsigned long arg)
   {
           if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
                   return -EINVAL;
           return compat_sys_fcntl64(fd, cmd, arg);
   }
   
   asmlinkage long
   compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
   {
           long ret;
           aio_context_t ctx64;
   
           mm_segment_t oldfs = get_fs();
           if (unlikely(get_user(ctx64, ctx32p)))
                   return -EFAULT;
   
           set_fs(KERNEL_DS);
           /* The __user pointer cast is valid because of the set_fs() */
           ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
           set_fs(oldfs);
           /* truncating is ok because it's a user address */
           if (!ret)
                   ret = put_user((u32) ctx64, ctx32p);
           return ret;
   }
   
   asmlinkage long
   compat_sys_io_getevents(aio_context_t ctx_id,
                                    unsigned long min_nr,
                                    unsigned long nr,
                                    struct io_event __user *events,
                                    struct compat_timespec __user *timeout)
   {
           long ret;
           struct timespec t;
           struct timespec __user *ut = NULL;
   
           ret = -EFAULT;
           if (unlikely(!access_ok(VERIFY_WRITE, events, 
                                   nr * sizeof(struct io_event))))
                   goto out;
           if (timeout) {
                   if (get_compat_timespec(&t, timeout))
                           goto out;
   
                   ut = compat_alloc_user_space(sizeof(*ut));
                   if (copy_to_user(ut, &t, sizeof(t)) )
                           goto out;
           } 
           ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
   out:
           return ret;
   }
   
   /* A write operation does a read from user space and vice versa */
   #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
   
   ssize_t compat_rw_copy_check_uvector(int type,
                   const struct compat_iovec __user *uvector, unsigned long nr_segs,
                   unsigned long fast_segs, struct iovec *fast_pointer,
                   struct iovec **ret_pointer)
   {
           compat_ssize_t tot_len;
           struct iovec *iov = *ret_pointer = fast_pointer;
           ssize_t ret = 0;
           int seg;
   
           /*
            * SuS says "The readv() function *may* fail if the iovcnt argument
            * was less than or equal to 0, or greater than {IOV_MAX}.  Linux has
            * traditionally returned zero for zero segments, so...
            */
           if (nr_segs == 0)
                   goto out;
   
           ret = -EINVAL;
           if (nr_segs > UIO_MAXIOV || nr_segs < 0)
                   goto out;
           if (nr_segs > fast_segs) {
                   ret = -ENOMEM;
                   iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
                   if (iov == NULL)
                           goto out;
           }
           *ret_pointer = iov;
   
           /*
            * Single unix specification:
            * We should -EINVAL if an element length is not >= 0 and fitting an
            * ssize_t.
            *
            * In Linux, the total length is limited to MAX_RW_COUNT, there is
            * no overflow possibility.
            */
           tot_len = 0;
           ret = -EINVAL;
           for (seg = 0; seg < nr_segs; seg++) {
                   compat_uptr_t buf;
                   compat_ssize_t len;
   
                   if (__get_user(len, &uvector->iov_len) ||
                      __get_user(buf, &uvector->iov_base)) {
                           ret = -EFAULT;
                           goto out;
                   }
                   if (len < 0)    /* size_t not fitting in compat_ssize_t .. */
                           goto out;
                   if (type >= 0 &&
                       !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
                           ret = -EFAULT;
                           goto out;
                   }
                   if (len > MAX_RW_COUNT - tot_len)
                           len = MAX_RW_COUNT - tot_len;
                   tot_len += len;
                   iov->iov_base = compat_ptr(buf);
                   iov->iov_len = (compat_size_t) len;
                   uvector++;
                   iov++;
           }
           ret = tot_len;
   
   out:
           return ret;
   }
   
   static inline long
   copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
   {
           compat_uptr_t uptr;
           int i;
   
           for (i = 0; i < nr; ++i) {
                   if (get_user(uptr, ptr32 + i))
                           return -EFAULT;
                   if (put_user(compat_ptr(uptr), ptr64 + i))
                           return -EFAULT;
           }
           return 0;
   }
   
   #define MAX_AIO_SUBMITS         (PAGE_SIZE/sizeof(struct iocb *))
   
   asmlinkage long
   compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
   {
           struct iocb __user * __user *iocb64; 
           long ret;
   
           if (unlikely(nr < 0))
                   return -EINVAL;
   
           if (nr > MAX_AIO_SUBMITS)
                   nr = MAX_AIO_SUBMITS;
           
           iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
           ret = copy_iocb(nr, iocb, iocb64);
           if (!ret)
                   ret = do_io_submit(ctx_id, nr, iocb64, 1);
           return ret;
   }
   
   struct compat_ncp_mount_data {
           compat_int_t version;
           compat_uint_t ncp_fd;
           __compat_uid_t mounted_uid;
           compat_pid_t wdog_pid;
           unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
           compat_uint_t time_out;
           compat_uint_t retry_count;
           compat_uint_t flags;
           __compat_uid_t uid;
           __compat_gid_t gid;
           compat_mode_t file_mode;
           compat_mode_t dir_mode;
   };
   
   struct compat_ncp_mount_data_v4 {
           compat_int_t version;
           compat_ulong_t flags;
           compat_ulong_t mounted_uid;
           compat_long_t wdog_pid;
           compat_uint_t ncp_fd;
           compat_uint_t time_out;
           compat_uint_t retry_count;
           compat_ulong_t uid;
           compat_ulong_t gid;
           compat_ulong_t file_mode;
           compat_ulong_t dir_mode;
   };
   
   static void *do_ncp_super_data_conv(void *raw_data)
   {
           int version = *(unsigned int *)raw_data;
   
           if (version == 3) {
                   struct compat_ncp_mount_data *c_n = raw_data;
                   struct ncp_mount_data *n = raw_data;
   
                   n->dir_mode = c_n->dir_mode;
                   n->file_mode = c_n->file_mode;
                   n->gid = c_n->gid;
                   n->uid = c_n->uid;
                   memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
                   n->wdog_pid = c_n->wdog_pid;
                   n->mounted_uid = c_n->mounted_uid;
           } else if (version == 4) {
                   struct compat_ncp_mount_data_v4 *c_n = raw_data;
                   struct ncp_mount_data_v4 *n = raw_data;
   
                   n->dir_mode = c_n->dir_mode;
                   n->file_mode = c_n->file_mode;
                   n->gid = c_n->gid;
                   n->uid = c_n->uid;
                   n->retry_count = c_n->retry_count;
                   n->time_out = c_n->time_out;
                   n->ncp_fd = c_n->ncp_fd;
                   n->wdog_pid = c_n->wdog_pid;
                   n->mounted_uid = c_n->mounted_uid;
                   n->flags = c_n->flags;
           } else if (version != 5) {
                   return NULL;
           }
   
           return raw_data;
   }
   
   
   struct compat_nfs_string {
           compat_uint_t len;
           compat_uptr_t data;
   };
   
   static inline void compat_nfs_string(struct nfs_string *dst,
                                        struct compat_nfs_string *src)
   {
           dst->data = compat_ptr(src->data);
           dst->len = src->len;
   }
   
   struct compat_nfs4_mount_data_v1 {
           compat_int_t version;
           compat_int_t flags;
           compat_int_t rsize;
           compat_int_t wsize;
           compat_int_t timeo;
           compat_int_t retrans;
           compat_int_t acregmin;
           compat_int_t acregmax;
           compat_int_t acdirmin;
           compat_int_t acdirmax;
           struct compat_nfs_string client_addr;
           struct compat_nfs_string mnt_path;
           struct compat_nfs_string hostname;
           compat_uint_t host_addrlen;
           compat_uptr_t host_addr;
           compat_int_t proto;
           compat_int_t auth_flavourlen;
           compat_uptr_t auth_flavours;
   };
   
   static int do_nfs4_super_data_conv(void *raw_data)
   {
           int version = *(compat_uint_t *) raw_data;
   
           if (version == 1) {
                   struct compat_nfs4_mount_data_v1 *raw = raw_data;
                   struct nfs4_mount_data *real = raw_data;
   
                   /* copy the fields backwards */
                   real->auth_flavours = compat_ptr(raw->auth_flavours);
                   real->auth_flavourlen = raw->auth_flavourlen;
                   real->proto = raw->proto;
                   real->host_addr = compat_ptr(raw->host_addr);
                   real->host_addrlen = raw->host_addrlen;
                   compat_nfs_string(&real->hostname, &raw->hostname);
                   compat_nfs_string(&real->mnt_path, &raw->mnt_path);
                   compat_nfs_string(&real->client_addr, &raw->client_addr);
                   real->acdirmax = raw->acdirmax;
                   real->acdirmin = raw->acdirmin;
                   real->acregmax = raw->acregmax;
                   real->acregmin = raw->acregmin;
                   real->retrans = raw->retrans;
                   real->timeo = raw->timeo;
                   real->wsize = raw->wsize;
                   real->rsize = raw->rsize;
                   real->flags = raw->flags;
                   real->version = raw->version;
           }
   
           return 0;
   }
   
   #define NCPFS_NAME      "ncpfs"
   #define NFS4_NAME       "nfs4"
   
   asmlinkage long compat_sys_mount(const char __user * dev_name,
                                    const char __user * dir_name,
                                    const char __user * type, unsigned long flags,
                                    const void __user * data)
   {
           char *kernel_type;
           unsigned long data_page;
           char *kernel_dev;
           struct filename *dir;
           int retval;
   
           retval = copy_mount_string(type, &kernel_type);
           if (retval < 0)
                   goto out;
   
           dir = getname(dir_name);
           retval = PTR_ERR(dir);
           if (IS_ERR(dir))
                   goto out1;
   
           retval = copy_mount_string(dev_name, &kernel_dev);
           if (retval < 0)
                   goto out2;
   
           retval = copy_mount_options(data, &data_page);
           if (retval < 0)
                   goto out3;
   
           retval = -EINVAL;
   
           if (kernel_type && data_page) {
                   if (!strcmp(kernel_type, NCPFS_NAME)) {
                           do_ncp_super_data_conv((void *)data_page);
                   } else if (!strcmp(kernel_type, NFS4_NAME)) {
                           if (do_nfs4_super_data_conv((void *) data_page))
                                   goto out4;
                   }
           }
   
           retval = do_mount(kernel_dev, dir->name, kernel_type,
                           flags, (void*)data_page);
   
    out4:
           free_page(data_page);
    out3:
           kfree(kernel_dev);
    out2:
           putname(dir);
    out1:
           kfree(kernel_type);
    out:
           return retval;
   }
   
   struct compat_old_linux_dirent {
           compat_ulong_t  d_ino;
           compat_ulong_t  d_offset;
           unsigned short  d_namlen;
           char            d_name[1];
   };
   
   struct compat_readdir_callback {
           struct compat_old_linux_dirent __user *dirent;
           int result;
   };
   
   static int compat_fillonedir(void *__buf, const char *name, int namlen,
                           loff_t offset, u64 ino, unsigned int d_type)
   {
           struct compat_readdir_callback *buf = __buf;
           struct compat_old_linux_dirent __user *dirent;
           compat_ulong_t d_ino;
   
           if (buf->result)
                   return -EINVAL;
           d_ino = ino;
           if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
                   buf->result = -EOVERFLOW;
                   return -EOVERFLOW;
           }
           buf->result++;
           dirent = buf->dirent;
           if (!access_ok(VERIFY_WRITE, dirent,
                           (unsigned long)(dirent->d_name + namlen + 1) -
                                   (unsigned long)dirent))
                   goto efault;
           if (    __put_user(d_ino, &dirent->d_ino) ||
                   __put_user(offset, &dirent->d_offset) ||
                   __put_user(namlen, &dirent->d_namlen) ||
                   __copy_to_user(dirent->d_name, name, namlen) ||
                   __put_user(0, dirent->d_name + namlen))
                   goto efault;
           return 0;
   efault:
           buf->result = -EFAULT;
           return -EFAULT;
   }
   
   asmlinkage long compat_sys_old_readdir(unsigned int fd,
           struct compat_old_linux_dirent __user *dirent, unsigned int count)
   {
           int error;
           struct fd f = fdget(fd);
           struct compat_readdir_callback buf;
   
           if (!f.file)
                   return -EBADF;
   
           buf.result = 0;
           buf.dirent = dirent;
   
           error = vfs_readdir(f.file, compat_fillonedir, &buf);
           if (buf.result)
                   error = buf.result;
   
           fdput(f);
           return error;
   }
   
   struct compat_linux_dirent {
           compat_ulong_t  d_ino;
           compat_ulong_t  d_off;
           unsigned short  d_reclen;
           char            d_name[1];
   };
   
   struct compat_getdents_callback {
           struct compat_linux_dirent __user *current_dir;
           struct compat_linux_dirent __user *previous;
           int count;
           int error;
   };
   
   static int compat_filldir(void *__buf, const char *name, int namlen,
                   loff_t offset, u64 ino, unsigned int d_type)
   {
           struct compat_linux_dirent __user * dirent;
           struct compat_getdents_callback *buf = __buf;
           compat_ulong_t d_ino;
           int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
                   namlen + 2, sizeof(compat_long_t));
   
           buf->error = -EINVAL;   /* only used if we fail.. */
           if (reclen > buf->count)
                   return -EINVAL;
           d_ino = ino;
           if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
                   buf->error = -EOVERFLOW;
                   return -EOVERFLOW;
           }
           dirent = buf->previous;
           if (dirent) {
                   if (__put_user(offset, &dirent->d_off))
                           goto efault;
           }
           dirent = buf->current_dir;
           if (__put_user(d_ino, &dirent->d_ino))
                   goto efault;
           if (__put_user(reclen, &dirent->d_reclen))
                   goto efault;
           if (copy_to_user(dirent->d_name, name, namlen))
                   goto efault;
           if (__put_user(0, dirent->d_name + namlen))
                   goto efault;
           if (__put_user(d_type, (char  __user *) dirent + reclen - 1))
                   goto efault;
           buf->previous = dirent;
           dirent = (void __user *)dirent + reclen;
           buf->current_dir = dirent;
           buf->count -= reclen;
           return 0;
   efault:
           buf->error = -EFAULT;
           return -EFAULT;
   }
   
   asmlinkage long compat_sys_getdents(unsigned int fd,
                   struct compat_linux_dirent __user *dirent, unsigned int count)
   {
           struct fd f;
           struct compat_linux_dirent __user * lastdirent;
           struct compat_getdents_callback buf;
           int error;
   
           if (!access_ok(VERIFY_WRITE, dirent, count))
                   return -EFAULT;
   
           f = fdget(fd);
           if (!f.file)
                   return -EBADF;
   
           buf.current_dir = dirent;
           buf.previous = NULL;
           buf.count = count;
           buf.error = 0;
   
           error = vfs_readdir(f.file, compat_filldir, &buf);
           if (error >= 0)
                   error = buf.error;
           lastdirent = buf.previous;
           if (lastdirent) {
                   if (put_user(f.file->f_pos, &lastdirent->d_off))
                           error = -EFAULT;
                   else
                           error = count - buf.count;
           }
           fdput(f);
           return error;
   }
   
   #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
   
   struct compat_getdents_callback64 {
           struct linux_dirent64 __user *current_dir;
           struct linux_dirent64 __user *previous;
           int count;
           int error;
   };
   
   static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
                        u64 ino, unsigned int d_type)
   {
           struct linux_dirent64 __user *dirent;
           struct compat_getdents_callback64 *buf = __buf;
           int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
                   sizeof(u64));
           u64 off;
   
           buf->error = -EINVAL;   /* only used if we fail.. */
          if (reclen > buf->count)
                  return -EINVAL;
          dirent = buf->previous;
  
          if (dirent) {
                  if (__put_user_unaligned(offset, &dirent->d_off))
                          goto efault;
          }
          dirent = buf->current_dir;
          if (__put_user_unaligned(ino, &dirent->d_ino))
                  goto efault;
          off = 0;
          if (__put_user_unaligned(off, &dirent->d_off))
                  goto efault;
          if (__put_user(reclen, &dirent->d_reclen))
                  goto efault;
          if (__put_user(d_type, &dirent->d_type))
                  goto efault;
          if (copy_to_user(dirent->d_name, name, namlen))
                  goto efault;
          if (__put_user(0, dirent->d_name + namlen))
                  goto efault;
          buf->previous = dirent;
          dirent = (void __user *)dirent + reclen;
          buf->current_dir = dirent;
          buf->count -= reclen;
          return 0;
  efault:
          buf->error = -EFAULT;
          return -EFAULT;
  }
  
  asmlinkage long compat_sys_getdents64(unsigned int fd,
                  struct linux_dirent64 __user * dirent, unsigned int count)
  {
          struct fd f;
          struct linux_dirent64 __user * lastdirent;
          struct compat_getdents_callback64 buf;
          int error;
  
          if (!access_ok(VERIFY_WRITE, dirent, count))
                  return -EFAULT;
  
          f = fdget(fd);
          if (!f.file)
                  return -EBADF;
  
          buf.current_dir = dirent;
          buf.previous = NULL;
          buf.count = count;
          buf.error = 0;
  
          error = vfs_readdir(f.file, compat_filldir64, &buf);
          if (error >= 0)
                  error = buf.error;
          lastdirent = buf.previous;
          if (lastdirent) {
                  typeof(lastdirent->d_off) d_off = f.file->f_pos;
                  if (__put_user_unaligned(d_off, &lastdirent->d_off))
                          error = -EFAULT;
                  else
                          error = count - buf.count;
          }
          fdput(f);
          return error;
  }
  #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
  
  static ssize_t compat_do_readv_writev(int type, struct file *file,
                                 const struct compat_iovec __user *uvector,
                                 unsigned long nr_segs, loff_t *pos)
  {
          compat_ssize_t tot_len;
          struct iovec iovstack[UIO_FASTIOV];
          struct iovec *iov = iovstack;
          ssize_t ret;
          io_fn_t fn;
          iov_fn_t fnv;
  
          ret = -EINVAL;
          if (!file->f_op)
                  goto out;
  
          ret = -EFAULT;
          if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
                  goto out;
  
          tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
                                                 UIO_FASTIOV, iovstack, &iov);
          if (tot_len == 0) {
                  ret = 0;
                  goto out;
          }
  
          ret = rw_verify_area(type, file, pos, tot_len);
          if (ret < 0)
                  goto out;
  
          fnv = NULL;
          if (type == READ) {
                  fn = file->f_op->read;
                  fnv = file->f_op->aio_read;
          } else {
                  fn = (io_fn_t)file->f_op->write;
                  fnv = file->f_op->aio_write;
          }
  
          if (fnv)
                  ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
                                                  pos, fnv);
          else
                  ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
  
  out:
          if (iov != iovstack)
                  kfree(iov);
          if ((ret + (type == READ)) > 0) {
                  if (type == READ)
                          fsnotify_access(file);
                  else
                          fsnotify_modify(file);
          }
          return ret;
  }
  
  static size_t compat_readv(struct file *file,
                             const struct compat_iovec __user *vec,
                             unsigned long vlen, loff_t *pos)
  {
          ssize_t ret = -EBADF;
  
          if (!(file->f_mode & FMODE_READ))
                  goto out;
  
          ret = -EINVAL;
          if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
                  goto out;
  
          ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
  
  out:
          if (ret > 0)
                  add_rchar(current, ret);
          inc_syscr(current);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
                   unsigned long vlen)
  {
          struct fd f = fdget(fd);
          ssize_t ret;
          loff_t pos;
  
          if (!f.file)
                  return -EBADF;
          pos = f.file->f_pos;
          ret = compat_readv(f.file, vec, vlen, &pos);
          f.file->f_pos = pos;
          fdput(f);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
                      unsigned long vlen, loff_t pos)
  {
          struct fd f;
          ssize_t ret;
  
          if (pos < 0)
                  return -EINVAL;
          f = fdget(fd);
          if (!f.file)
                  return -EBADF;
          ret = -ESPIPE;
          if (f.file->f_mode & FMODE_PREAD)
                  ret = compat_readv(f.file, vec, vlen, &pos);
          fdput(f);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
                    unsigned long vlen, u32 pos_low, u32 pos_high)
  {
          loff_t pos = ((loff_t)pos_high << 32) | pos_low;
          return compat_sys_preadv64(fd, vec, vlen, pos);
  }
  
  static size_t compat_writev(struct file *file,
                              const struct compat_iovec __user *vec,
                              unsigned long vlen, loff_t *pos)
  {
          ssize_t ret = -EBADF;
  
          if (!(file->f_mode & FMODE_WRITE))
                  goto out;
  
          ret = -EINVAL;
          if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
                  goto out;
  
          ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
  
  out:
          if (ret > 0)
                  add_wchar(current, ret);
          inc_syscw(current);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
                    unsigned long vlen)
  {
          struct fd f = fdget(fd);
          ssize_t ret;
          loff_t pos;
  
          if (!f.file)
                  return -EBADF;
          pos = f.file->f_pos;
          ret = compat_writev(f.file, vec, vlen, &pos);
          f.file->f_pos = pos;
          fdput(f);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
                       unsigned long vlen, loff_t pos)
  {
          struct fd f;
          ssize_t ret;
  
          if (pos < 0)
                  return -EINVAL;
          f = fdget(fd);
          if (!f.file)
                  return -EBADF;
          ret = -ESPIPE;
          if (f.file->f_mode & FMODE_PWRITE)
                  ret = compat_writev(f.file, vec, vlen, &pos);
          fdput(f);
          return ret;
  }
  
  asmlinkage ssize_t
  compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
                     unsigned long vlen, u32 pos_low, u32 pos_high)
  {
          loff_t pos = ((loff_t)pos_high << 32) | pos_low;
          return compat_sys_pwritev64(fd, vec, vlen, pos);
  }
  
  asmlinkage long
  compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
                      unsigned int nr_segs, unsigned int flags)
  {
          unsigned i;
          struct iovec __user *iov;
          if (nr_segs > UIO_MAXIOV)
                  return -EINVAL;
          iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
          for (i = 0; i < nr_segs; i++) {
                  struct compat_iovec v;
                  if (get_user(v.iov_base, &iov32[i].iov_base) ||
                      get_user(v.iov_len, &iov32[i].iov_len) ||
                      put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
                      put_user(v.iov_len, &iov[i].iov_len))
                          return -EFAULT;
          }
          return sys_vmsplice(fd, iov, nr_segs, flags);
  }
  
  /*
   * Exactly like fs/open.c:sys_open(), except that it doesn't set the
   * O_LARGEFILE flag.
   */
  asmlinkage long
  compat_sys_open(const char __user *filename, int flags, umode_t mode)
  {
          return do_sys_open(AT_FDCWD, filename, flags, mode);
  }
  
  /*
   * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
   * O_LARGEFILE flag.
   */
  asmlinkage long
  compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
  {
          return do_sys_open(dfd, filename, flags, mode);
  }
  
  #define __COMPAT_NFDBITS       (8 * sizeof(compat_ulong_t))
  
  static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
                                        int timeval, int ret)
  {
          struct timespec ts;
  
          if (!p)
                  return ret;
  
          if (current->personality & STICKY_TIMEOUTS)
                  goto sticky;
  
          /* No update for zero timeout */
          if (!end_time->tv_sec && !end_time->tv_nsec)
                  return ret;
  
          ktime_get_ts(&ts);
          ts = timespec_sub(*end_time, ts);
          if (ts.tv_sec < 0)
                  ts.tv_sec = ts.tv_nsec = 0;
  
          if (timeval) {
                  struct compat_timeval rtv;
  
                  rtv.tv_sec = ts.tv_sec;
                  rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
  
                  if (!copy_to_user(p, &rtv, sizeof(rtv)))
                          return ret;
          } else {
                  struct compat_timespec rts;
  
                  rts.tv_sec = ts.tv_sec;
                  rts.tv_nsec = ts.tv_nsec;
  
                  if (!copy_to_user(p, &rts, sizeof(rts)))
                          return ret;
          }
          /*
           * If an application puts its timeval in read-only memory, we
           * don't want the Linux-specific update to the timeval to
           * cause a fault after the select has completed
           * successfully. However, because we're not updating the
           * timeval, we can't restart the system call.
           */
  
  sticky:
          if (ret == -ERESTARTNOHAND)
                  ret = -EINTR;
          return ret;
  }
  
  /*
   * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
   * 64-bit unsigned longs.
   */
  static
  int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
                          unsigned long *fdset)
  {
          nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
          if (ufdset) {
                  unsigned long odd;
  
                  if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
                          return -EFAULT;
  
                  odd = nr & 1UL;
                  nr &= ~1UL;
                  while (nr) {
                          unsigned long h, l;
                          if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
                                  return -EFAULT;
                          ufdset += 2;
                          *fdset++ = h << 32 | l;
                          nr -= 2;
                  }
                  if (odd && __get_user(*fdset, ufdset))
                          return -EFAULT;
          } else {
                  /* Tricky, must clear full unsigned long in the
                   * kernel fdset at the end, this makes sure that
                   * actually happens.
                   */
                  memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
          }
          return 0;
  }
  
  static
  int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
                        unsigned long *fdset)
  {
          unsigned long odd;
          nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
  
          if (!ufdset)
                  return 0;
  
          odd = nr & 1UL;
          nr &= ~1UL;
          while (nr) {
                  unsigned long h, l;
                  l = *fdset++;
                  h = l >> 32;
                  if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
                          return -EFAULT;
                  ufdset += 2;
                  nr -= 2;
          }
          if (odd && __put_user(*fdset, ufdset))
                  return -EFAULT;
          return 0;
  }
  
  
  /*
   * This is a virtual copy of sys_select from fs/select.c and probably
   * should be compared to it from time to time
   */
  
  /*
   * We can actually return ERESTARTSYS instead of EINTR, but I'd
   * like to be certain this leads to no problems. So I return
   * EINTR just for safety.
   *
   * Update: ERESTARTSYS breaks at least the xview clock binary, so
   * I'm trying ERESTARTNOHAND which restart only when you want to.
   */
  int compat_core_sys_select(int n, compat_ulong_t __user *inp,
          compat_ulong_t __user *outp, compat_ulong_t __user *exp,
          struct timespec *end_time)
  {
          fd_set_bits fds;
          void *bits;
          int size, max_fds, ret = -EINVAL;
          struct fdtable *fdt;
          long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
  
          if (n < 0)
                  goto out_nofds;
  
          /* max_fds can increase, so grab it once to avoid race */
          rcu_read_lock();
          fdt = files_fdtable(current->files);
          max_fds = fdt->max_fds;
          rcu_read_unlock();
          if (n > max_fds)
                  n = max_fds;
  
          /*
           * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
           * since we used fdset we need to allocate memory in units of
           * long-words.
           */
          size = FDS_BYTES(n);
          bits = stack_fds;
          if (size > sizeof(stack_fds) / 6) {
                  bits = kmalloc(6 * size, GFP_KERNEL);
                  ret = -ENOMEM;
                  if (!bits)
                          goto out_nofds;
          }
          fds.in      = (unsigned long *)  bits;
          fds.out     = (unsigned long *) (bits +   size);
          fds.ex      = (unsigned long *) (bits + 2*size);
          fds.res_in  = (unsigned long *) (bits + 3*size);
          fds.res_out = (unsigned long *) (bits + 4*size);
          fds.res_ex  = (unsigned long *) (bits + 5*size);
  
          if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
              (ret = compat_get_fd_set(n, outp, fds.out)) ||
              (ret = compat_get_fd_set(n, exp, fds.ex)))
                  goto out;
          zero_fd_set(n, fds.res_in);
          zero_fd_set(n, fds.res_out);
          zero_fd_set(n, fds.res_ex);
  
          ret = do_select(n, &fds, end_time);
  
          if (ret < 0)
                  goto out;
          if (!ret) {
                  ret = -ERESTARTNOHAND;
                  if (signal_pending(current))
                          goto out;
                  ret = 0;
          }
  
          if (compat_set_fd_set(n, inp, fds.res_in) ||
              compat_set_fd_set(n, outp, fds.res_out) ||
              compat_set_fd_set(n, exp, fds.res_ex))
                  ret = -EFAULT;
  out:
          if (bits != stack_fds)
                  kfree(bits);
  out_nofds:
          return ret;
  }
  
  asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
          compat_ulong_t __user *outp, compat_ulong_t __user *exp,
          struct compat_timeval __user *tvp)
  {
          struct timespec end_time, *to = NULL;
          struct compat_timeval tv;
          int ret;
  
          if (tvp) {
                  if (copy_from_user(&tv, tvp, sizeof(tv)))
                          return -EFAULT;
  
                  to = &end_time;
                  if (poll_select_set_timeout(to,
                                  tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
                                  (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
                          return -EINVAL;
          }
  
          ret = compat_core_sys_select(n, inp, outp, exp, to);
          ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
  
          return ret;
  }
  
  struct compat_sel_arg_struct {
          compat_ulong_t n;
          compat_uptr_t inp;
          compat_uptr_t outp;
          compat_uptr_t exp;
          compat_uptr_t tvp;
  };
  
  asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
  {
          struct compat_sel_arg_struct a;
  
          if (copy_from_user(&a, arg, sizeof(a)))
                  return -EFAULT;
          return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
                                   compat_ptr(a.exp), compat_ptr(a.tvp));
  }
  
  static long do_compat_pselect(int n, compat_ulong_t __user *inp,
          compat_ulong_t __user *outp, compat_ulong_t __user *exp,
          struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
          compat_size_t sigsetsize)
  {
          compat_sigset_t ss32;
          sigset_t ksigmask, sigsaved;
          struct compat_timespec ts;
          struct timespec end_time, *to = NULL;
          int ret;
  
          if (tsp) {
                  if (copy_from_user(&ts, tsp, sizeof(ts)))
                          return -EFAULT;
  
                  to = &end_time;
                  if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
                          return -EINVAL;
          }
  
          if (sigmask) {
                  if (sigsetsize != sizeof(compat_sigset_t))
                          return -EINVAL;
                  if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
                          return -EFAULT;
                  sigset_from_compat(&ksigmask, &ss32);
  
                  sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
                  sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
          }
  
          ret = compat_core_sys_select(n, inp, outp, exp, to);
          ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
  
          if (ret == -ERESTARTNOHAND) {
                  /*
                   * Don't restore the signal mask yet. Let do_signal() deliver
                   * the signal on the way back to userspace, before the signal
                   * mask is restored.
                   */
                  if (sigmask) {
                          memcpy(&current->saved_sigmask, &sigsaved,
                                          sizeof(sigsaved));
                          set_restore_sigmask();
                  }
          } else if (sigmask)
                  sigprocmask(SIG_SETMASK, &sigsaved, NULL);
  
          return ret;
  }
  
  asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
          compat_ulong_t __user *outp, compat_ulong_t __user *exp,
          struct compat_timespec __user *tsp, void __user *sig)
  {
          compat_size_t sigsetsize = 0;
          compat_uptr_t up = 0;
  
          if (sig) {
                  if (!access_ok(VERIFY_READ, sig,
                                  sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
                          __get_user(up, (compat_uptr_t __user *)sig) ||
                          __get_user(sigsetsize,
                                  (compat_size_t __user *)(sig+sizeof(up))))
                          return -EFAULT;
          }
          return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
                                   sigsetsize);
  }
  
  asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
          unsigned int nfds, struct compat_timespec __user *tsp,
          const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
  {
          compat_sigset_t ss32;
          sigset_t ksigmask, sigsaved;
          struct compat_timespec ts;
          struct timespec end_time, *to = NULL;
          int ret;
  
          if (tsp) {
                  if (copy_from_user(&ts, tsp, sizeof(ts)))
                          return -EFAULT;
  
                  to = &end_time;
                  if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
                          return -EINVAL;
          }
  
          if (sigmask) {
                  if (sigsetsize != sizeof(compat_sigset_t))
                          return -EINVAL;
                  if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
                          return -EFAULT;
                  sigset_from_compat(&ksigmask, &ss32);
  
                  sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
                  sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
          }
  
          ret = do_sys_poll(ufds, nfds, to);
  
          /* We can restart this syscall, usually */
          if (ret == -EINTR) {
                  /*
                   * Don't restore the signal mask yet. Let do_signal() deliver
                   * the signal on the way back to userspace, before the signal
                   * mask is restored.
                   */
                  if (sigmask) {
                          memcpy(&current->saved_sigmask, &sigsaved,
                                  sizeof(sigsaved));
                          set_restore_sigmask();
                  }
                  ret = -ERESTARTNOHAND;
          } else if (sigmask)
                  sigprocmask(SIG_SETMASK, &sigsaved, NULL);
  
          ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
  
          return ret;
  }
  
  #ifdef CONFIG_EPOLL
  
  asmlinkage long compat_sys_epoll_pwait(int epfd,
                          struct compat_epoll_event __user *events,
                          int maxevents, int timeout,
                          const compat_sigset_t __user *sigmask,
                          compat_size_t sigsetsize)
  {
          long err;
          compat_sigset_t csigmask;
          sigset_t ksigmask, sigsaved;
  
          /*
           * If the caller wants a certain signal mask to be set during the wait,
           * we apply it here.
           */
          if (sigmask) {
                  if (sigsetsize != sizeof(compat_sigset_t))
                          return -EINVAL;
                  if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
                          return -EFAULT;
                  sigset_from_compat(&ksigmask, &csigmask);
                  sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
                  sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
          }
  
          err = sys_epoll_wait(epfd, events, maxevents, timeout);
  
          /*
           * If we changed the signal mask, we need to restore the original one.
           * In case we've got a signal while waiting, we do not restore the
           * signal mask yet, and we allow do_signal() to deliver the signal on
           * the way back to userspace, before the signal mask is restored.
           */
          if (sigmask) {
                  if (err == -EINTR) {
                          memcpy(&current->saved_sigmask, &sigsaved,
                                 sizeof(sigsaved));
                          set_restore_sigmask();
                  } else
                          sigprocmask(SIG_SETMASK, &sigsaved, NULL);
          }
  
          return err;
  }
  
  #endif /* CONFIG_EPOLL */
  
  #ifdef CONFIG_SIGNALFD
  
  asmlinkage long compat_sys_signalfd4(int ufd,
                                       const compat_sigset_t __user *sigmask,
                                       compat_size_t sigsetsize, int flags)
  {
          compat_sigset_t ss32;
          sigset_t tmp;
          sigset_t __user *ksigmask;
  
          if (sigsetsize != sizeof(compat_sigset_t))
                  return -EINVAL;
          if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
                  return -EFAULT;
          sigset_from_compat(&tmp, &ss32);
          ksigmask = compat_alloc_user_space(sizeof(sigset_t));
          if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
                  return -EFAULT;
  
          return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
  }
  
  asmlinkage long compat_sys_signalfd(int ufd,
                                      const compat_sigset_t __user *sigmask,
                                      compat_size_t sigsetsize)
  {
          return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
  }
  #endif /* CONFIG_SIGNALFD */
  
  #ifdef CONFIG_TIMERFD
  
  asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
                                     const struct compat_itimerspec __user *utmr,
                                     struct compat_itimerspec __user *otmr)
  {
          int error;
          struct itimerspec t;
          struct itimerspec __user *ut;
  
          if (get_compat_itimerspec(&t, utmr))
                  return -EFAULT;
          ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
          if (copy_to_user(&ut[0], &t, sizeof(t)))
                  return -EFAULT;
          error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
          if (!error && otmr)
                  error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
                           put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
  
          return error;
  }
  
  asmlinkage long compat_sys_timerfd_gettime(int ufd,
                                     struct compat_itimerspec __user *otmr)
  {
          int error;
          struct itimerspec t;
          struct itimerspec __user *ut;
  
          ut = compat_alloc_user_space(sizeof(struct itimerspec));
          error = sys_timerfd_gettime(ufd, ut);
          if (!error)
                  error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
                           put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
  
          return error;
  }
  
  #endif /* CONFIG_TIMERFD */
  
  #ifdef CONFIG_FHANDLE
  /*
   * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
   * doesn't set the O_LARGEFILE flag.
   */
  asmlinkage long
  compat_sys_open_by_handle_at(int mountdirfd,
                               struct file_handle __user *handle, int flags)
  {
          return do_handle_open(mountdirfd, handle, flags);
  }
  #endif
  
  #ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE
  asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
                                      compat_off_t __user *offset, compat_size_t count)
  {
          loff_t pos;
          off_t off;
          ssize_t ret;
  
          if (offset) {
                  if (unlikely(get_user(off, offset)))
                          return -EFAULT;
                  pos = off;
                  ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
                  if (unlikely(put_user(pos, offset)))
                          return -EFAULT;
                  return ret;
          }
  
          return do_sendfile(out_fd, in_fd, NULL, count, 0);
  }
  #endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */

Cache object: 1c4f79601ec462742527f7cb03b95491