arch/x86_64/ia32/sys_ia32.c

   1 /*
   2  * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
   3  *             sys_sparc32
   4  *
   5  * Copyright (C) 2000           VA Linux Co
   6  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   8  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  10  * Copyright (C) 2000           Hewlett-Packard Co.
  11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  12  * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
  13  *
  14  * These routines maintain argument size conversion between 32bit and 64bit
  15  * environment. In 2.5 most of this should be moved to a generic directory.
  16  *
  17  * This file assumes that there is a hole at the end of user address space.
  18  *
  19  * Some of the functions are LE specific currently. These are hopefully all marked.
  20  * This should be fixed.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/fs.h>
  26 #include <linux/file.h>
  27 #include <linux/signal.h>
  28 #include <linux/syscalls.h>
  29 #include <linux/resource.h>
  30 #include <linux/times.h>
  31 #include <linux/utsname.h>
  32 #include <linux/smp.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/sem.h>
  35 #include <linux/msg.h>
  36 #include <linux/mm.h>
  37 #include <linux/shm.h>
  38 #include <linux/slab.h>
  39 #include <linux/uio.h>
  40 #include <linux/nfs_fs.h>
  41 #include <linux/quota.h>
  42 #include <linux/module.h>
  43 #include <linux/sunrpc/svc.h>
  44 #include <linux/nfsd/nfsd.h>
  45 #include <linux/nfsd/cache.h>
  46 #include <linux/nfsd/xdr.h>
  47 #include <linux/nfsd/syscall.h>
  48 #include <linux/poll.h>
  49 #include <linux/personality.h>
  50 #include <linux/stat.h>
  51 #include <linux/ipc.h>
  52 #include <linux/rwsem.h>
  53 #include <linux/binfmts.h>
  54 #include <linux/init.h>
  55 #include <linux/aio_abi.h>
  56 #include <linux/aio.h>
  57 #include <linux/compat.h>
  58 #include <linux/vfs.h>
  59 #include <linux/ptrace.h>
  60 #include <linux/highuid.h>
  61 #include <linux/vmalloc.h>
  62 #include <linux/fsnotify.h>
  63 #include <linux/sysctl.h>
  64 #include <asm/mman.h>
  65 #include <asm/types.h>
  66 #include <asm/uaccess.h>
  67 #include <asm/semaphore.h>
  68 #include <asm/atomic.h>
  69 #include <asm/ldt.h>
  70
  71 #include <net/scm.h>
  72 #include <net/sock.h>
  73 #include <asm/ia32.h>
  74
  75 #define AA(__x)         ((unsigned long)(__x))
  76
  77 int cp_compat_stat(struct kstat *kbuf, struct compat_stat __user *ubuf)
  78 {
  79         compat_ino_t ino;
  80
  81         typeof(ubuf->st_uid) uid = 0;
  82         typeof(ubuf->st_gid) gid = 0;
  83         SET_UID(uid, kbuf->uid);
  84         SET_GID(gid, kbuf->gid);
  85         if (!old_valid_dev(kbuf->dev) || !old_valid_dev(kbuf->rdev))
  86                 return -EOVERFLOW;
  87         if (kbuf->size >= 0x7fffffff)
  88                 return -EOVERFLOW;
  89         ino = kbuf->ino;
  90         if (sizeof(ino) < sizeof(kbuf->ino) && ino != kbuf->ino)
  91                 return -EOVERFLOW;
  92         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct compat_stat)) ||
  93             __put_user (old_encode_dev(kbuf->dev), &ubuf->st_dev) ||
  94             __put_user (ino, &ubuf->st_ino) ||
  95             __put_user (kbuf->mode, &ubuf->st_mode) ||
  96             __put_user (kbuf->nlink, &ubuf->st_nlink) ||
  97             __put_user (uid, &ubuf->st_uid) ||
  98             __put_user (gid, &ubuf->st_gid) ||
  99             __put_user (old_encode_dev(kbuf->rdev), &ubuf->st_rdev) ||
 100             __put_user (kbuf->size, &ubuf->st_size) ||
 101             __put_user (kbuf->atime.tv_sec, &ubuf->st_atime) ||
 102             __put_user (kbuf->atime.tv_nsec, &ubuf->st_atime_nsec) ||
 103             __put_user (kbuf->mtime.tv_sec, &ubuf->st_mtime) ||
 104             __put_user (kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
 105             __put_user (kbuf->ctime.tv_sec, &ubuf->st_ctime) ||
 106             __put_user (kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
 107             __put_user (kbuf->blksize, &ubuf->st_blksize) ||
 108             __put_user (kbuf->blocks, &ubuf->st_blocks))
 109                 return -EFAULT;
 110         return 0;
 111 }
 112
 113 asmlinkage long
 114 sys32_truncate64(char __user * filename, unsigned long offset_low, unsigned long offset_high)
 115 {
 116        return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
 117 }
 118
 119 asmlinkage long
 120 sys32_ftruncate64(unsigned int fd, unsigned long offset_low, unsigned long offset_high)
 121 {
 122        return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
 123 }
 124
 125 /* Another set for IA32/LFS -- x86_64 struct stat is different due to
 126    support for 64bit inode numbers. */
 127
 128 static int
 129 cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
 130 {
 131         typeof(ubuf->st_uid) uid = 0;
 132         typeof(ubuf->st_gid) gid = 0;
 133         SET_UID(uid, stat->uid);
 134         SET_GID(gid, stat->gid);
 135         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
 136             __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
 137             __put_user (stat->ino, &ubuf->__st_ino) ||
 138             __put_user (stat->ino, &ubuf->st_ino) ||
 139             __put_user (stat->mode, &ubuf->st_mode) ||
 140             __put_user (stat->nlink, &ubuf->st_nlink) ||
 141             __put_user (uid, &ubuf->st_uid) ||
 142             __put_user (gid, &ubuf->st_gid) ||
 143             __put_user (huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
 144             __put_user (stat->size, &ubuf->st_size) ||
 145             __put_user (stat->atime.tv_sec, &ubuf->st_atime) ||
 146             __put_user (stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
 147             __put_user (stat->mtime.tv_sec, &ubuf->st_mtime) ||
 148             __put_user (stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
 149             __put_user (stat->ctime.tv_sec, &ubuf->st_ctime) ||
 150             __put_user (stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
 151             __put_user (stat->blksize, &ubuf->st_blksize) ||
 152             __put_user (stat->blocks, &ubuf->st_blocks))
 153                 return -EFAULT;
 154         return 0;
 155 }
 156
 157 asmlinkage long
 158 sys32_stat64(char __user * filename, struct stat64 __user *statbuf)
 159 {
 160         struct kstat stat;
 161         int ret = vfs_stat(filename, &stat);
 162         if (!ret)
 163                 ret = cp_stat64(statbuf, &stat);
 164         return ret;
 165 }
 166
 167 asmlinkage long
 168 sys32_lstat64(char __user * filename, struct stat64 __user *statbuf)
 169 {
 170         struct kstat stat;
 171         int ret = vfs_lstat(filename, &stat);
 172         if (!ret)
 173                 ret = cp_stat64(statbuf, &stat);
 174         return ret;
 175 }
 176
 177 asmlinkage long
 178 sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
 179 {
 180         struct kstat stat;
 181         int ret = vfs_fstat(fd, &stat);
 182         if (!ret)
 183                 ret = cp_stat64(statbuf, &stat);
 184         return ret;
 185 }
 186
 187 asmlinkage long
 188 sys32_fstatat(unsigned int dfd, char __user *filename,
 189               struct stat64 __user* statbuf, int flag)
 190 {
 191         struct kstat stat;
 192         int error = -EINVAL;
 193
 194         if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
 195                 goto out;
 196
 197         if (flag & AT_SYMLINK_NOFOLLOW)
 198                 error = vfs_lstat_fd(dfd, filename, &stat);
 199         else
 200                 error = vfs_stat_fd(dfd, filename, &stat);
 201
 202         if (!error)
 203                 error = cp_stat64(statbuf, &stat);
 204
 205 out:
 206         return error;
 207 }
 208
 209 /*
 210  * Linux/i386 didn't use to be able to handle more than
 211  * 4 system call parameters, so these system calls used a memory
 212  * block for parameter passing..
 213  */
 214
 215 struct mmap_arg_struct {
 216         unsigned int addr;
 217         unsigned int len;
 218         unsigned int prot;
 219         unsigned int flags;
 220         unsigned int fd;
 221         unsigned int offset;
 222 };
 223
 224 asmlinkage long
 225 sys32_mmap(struct mmap_arg_struct __user *arg)
 226 {
 227         struct mmap_arg_struct a;
 228         struct file *file = NULL;
 229         unsigned long retval;
 230         struct mm_struct *mm ;
 231
 232         if (copy_from_user(&a, arg, sizeof(a)))
 233                 return -EFAULT;
 234
 235         if (a.offset & ~PAGE_MASK)
 236                 return -EINVAL;
 237
 238         if (!(a.flags & MAP_ANONYMOUS)) {
 239                 file = fget(a.fd);
 240                 if (!file)
 241                         return -EBADF;
 242         }
 243
 244         mm = current->mm;
 245         down_write(&mm->mmap_sem);
 246         retval = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, a.offset>>PAGE_SHIFT);
 247         if (file)
 248                 fput(file);
 249
 250         up_write(&mm->mmap_sem);
 251
 252         return retval;
 253 }
 254
 255 asmlinkage long
 256 sys32_mprotect(unsigned long start, size_t len, unsigned long prot)
 257 {
 258         return sys_mprotect(start,len,prot);
 259 }
 260
 261 asmlinkage long
 262 sys32_pipe(int __user *fd)
 263 {
 264         int retval;
 265         int fds[2];
 266
 267         retval = do_pipe(fds);
 268         if (retval)
 269                 goto out;
 270         if (copy_to_user(fd, fds, sizeof(fds)))
 271                 retval = -EFAULT;
 272   out:
 273         return retval;
 274 }
 275
 276 asmlinkage long
 277 sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
 278                    struct sigaction32 __user *oact,  unsigned int sigsetsize)
 279 {
 280         struct k_sigaction new_ka, old_ka;
 281         int ret;
 282         compat_sigset_t set32;
 283
 284         /* XXX: Don't preclude handling different sized sigset_t's.  */
 285         if (sigsetsize != sizeof(compat_sigset_t))
 286                 return -EINVAL;
 287
 288         if (act) {
 289                 compat_uptr_t handler, restorer;
 290
 291                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 292                     __get_user(handler, &act->sa_handler) ||
 293                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 294                     __get_user(restorer, &act->sa_restorer)||
 295                     __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t)))
 296                         return -EFAULT;
 297                 new_ka.sa.sa_handler = compat_ptr(handler);
 298                 new_ka.sa.sa_restorer = compat_ptr(restorer);
 299                 /* FIXME: here we rely on _COMPAT_NSIG_WORS to be >= than _NSIG_WORDS << 1 */
 300                 switch (_NSIG_WORDS) {
 301                 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
 302                                 | (((long)set32.sig[7]) << 32);
 303                 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
 304                                 | (((long)set32.sig[5]) << 32);
 305                 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
 306                                 | (((long)set32.sig[3]) << 32);
 307                 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
 308                                 | (((long)set32.sig[1]) << 32);
 309                 }
 310         }
 311
 312         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 313
 314         if (!ret && oact) {
 315                 /* FIXME: here we rely on _COMPAT_NSIG_WORS to be >= than _NSIG_WORDS << 1 */
 316                 switch (_NSIG_WORDS) {
 317                 case 4:
 318                         set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
 319                         set32.sig[6] = old_ka.sa.sa_mask.sig[3];
 320                 case 3:
 321                         set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
 322                         set32.sig[4] = old_ka.sa.sa_mask.sig[2];
 323                 case 2:
 324                         set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
 325                         set32.sig[2] = old_ka.sa.sa_mask.sig[1];
 326                 case 1:
 327                         set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
 328                         set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 329                 }
 330                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 331                     __put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler) ||
 332                     __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer) ||
 333                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 334                     __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t)))
 335                         return -EFAULT;
 336         }
 337
 338         return ret;
 339 }
 340
 341 asmlinkage long
 342 sys32_sigaction (int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact)
 343 {
 344         struct k_sigaction new_ka, old_ka;
 345         int ret;
 346
 347         if (act) {
 348                 compat_old_sigset_t mask;
 349                 compat_uptr_t handler, restorer;
 350
 351                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 352                     __get_user(handler, &act->sa_handler) ||
 353                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 354                     __get_user(restorer, &act->sa_restorer) ||
 355                     __get_user(mask, &act->sa_mask))
 356                         return -EFAULT;
 357
 358                 new_ka.sa.sa_handler = compat_ptr(handler);
 359                 new_ka.sa.sa_restorer = compat_ptr(restorer);
 360
 361                 siginitset(&new_ka.sa.sa_mask, mask);
 362         }
 363
 364         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 365
 366         if (!ret && oact) {
 367                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 368                     __put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler) ||
 369                     __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer) ||
 370                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 371                     __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 372                         return -EFAULT;
 373         }
 374
 375         return ret;
 376 }
 377
 378 asmlinkage long
 379 sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 380                         compat_sigset_t __user *oset, unsigned int sigsetsize)
 381 {
 382         sigset_t s;
 383         compat_sigset_t s32;
 384         int ret;
 385         mm_segment_t old_fs = get_fs();
 386
 387         if (set) {
 388                 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 389                         return -EFAULT;
 390                 switch (_NSIG_WORDS) {
 391                 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 392                 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 393                 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 394                 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 395                 }
 396         }
 397         set_fs (KERNEL_DS);
 398         ret = sys_rt_sigprocmask(how,
 399                                  set ? (sigset_t __user *)&s : NULL,
 400                                  oset ? (sigset_t __user *)&s : NULL,
 401                                  sigsetsize);
 402         set_fs (old_fs);
 403         if (ret) return ret;
 404         if (oset) {
 405                 switch (_NSIG_WORDS) {
 406                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 407                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 408                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 409                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 410                 }
 411                 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 412                         return -EFAULT;
 413         }
 414         return 0;
 415 }
 416
 417 static inline long
 418 get_tv32(struct timeval *o, struct compat_timeval __user *i)
 419 {
 420         int err = -EFAULT;
 421         if (access_ok(VERIFY_READ, i, sizeof(*i))) {
 422                 err = __get_user(o->tv_sec, &i->tv_sec);
 423                 err |= __get_user(o->tv_usec, &i->tv_usec);
 424         }
 425         return err;
 426 }
 427
 428 static inline long
 429 put_tv32(struct compat_timeval __user *o, struct timeval *i)
 430 {
 431         int err = -EFAULT;
 432         if (access_ok(VERIFY_WRITE, o, sizeof(*o))) {
 433                 err = __put_user(i->tv_sec, &o->tv_sec);
 434                 err |= __put_user(i->tv_usec, &o->tv_usec);
 435         }
 436         return err;
 437 }
 438
 439 extern unsigned int alarm_setitimer(unsigned int seconds);
 440
 441 asmlinkage long
 442 sys32_alarm(unsigned int seconds)
 443 {
 444         return alarm_setitimer(seconds);
 445 }
 446
 447 /* Translations due to time_t size differences.  Which affects all
 448    sorts of things, like timeval and itimerval.  */
 449
 450 extern struct timezone sys_tz;
 451
 452 asmlinkage long
 453 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 454 {
 455         if (tv) {
 456                 struct timeval ktv;
 457                 do_gettimeofday(&ktv);
 458                 if (put_tv32(tv, &ktv))
 459                         return -EFAULT;
 460         }
 461         if (tz) {
 462                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 463                         return -EFAULT;
 464         }
 465         return 0;
 466 }
 467
 468 asmlinkage long
 469 sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 470 {
 471         struct timeval ktv;
 472         struct timespec kts;
 473         struct timezone ktz;
 474
 475         if (tv) {
 476                 if (get_tv32(&ktv, tv))
 477                         return -EFAULT;
 478                 kts.tv_sec = ktv.tv_sec;
 479                 kts.tv_nsec = ktv.tv_usec * NSEC_PER_USEC;
 480         }
 481         if (tz) {
 482                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 483                         return -EFAULT;
 484         }
 485
 486         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 487 }
 488
 489 struct sel_arg_struct {
 490         unsigned int n;
 491         unsigned int inp;
 492         unsigned int outp;
 493         unsigned int exp;
 494         unsigned int tvp;
 495 };
 496
 497 asmlinkage long
 498 sys32_old_select(struct sel_arg_struct __user *arg)
 499 {
 500         struct sel_arg_struct a;
 501
 502         if (copy_from_user(&a, arg, sizeof(a)))
 503                 return -EFAULT;
 504         return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
 505                                  compat_ptr(a.exp), compat_ptr(a.tvp));
 506 }
 507
 508 extern asmlinkage long
 509 compat_sys_wait4(compat_pid_t pid, compat_uint_t * stat_addr, int options,
 510                  struct compat_rusage *ru);
 511
 512 asmlinkage long
 513 sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr, int options)
 514 {
 515         return compat_sys_wait4(pid, stat_addr, options, NULL);
 516 }
 517
 518 /* 32-bit timeval and related flotsam.  */
 519
 520 asmlinkage long
 521 sys32_sysfs(int option, u32 arg1, u32 arg2)
 522 {
 523         return sys_sysfs(option, arg1, arg2);
 524 }
 525
 526 asmlinkage long
 527 sys32_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
 528 {
 529         struct timespec t;
 530         int ret;
 531         mm_segment_t old_fs = get_fs ();
 532
 533         set_fs (KERNEL_DS);
 534         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 535         set_fs (old_fs);
 536         if (put_compat_timespec(&t, interval))
 537                 return -EFAULT;
 538         return ret;
 539 }
 540
 541 asmlinkage long
 542 sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
 543 {
 544         sigset_t s;
 545         compat_sigset_t s32;
 546         int ret;
 547         mm_segment_t old_fs = get_fs();
 548
 549         set_fs (KERNEL_DS);
 550         ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
 551         set_fs (old_fs);
 552         if (!ret) {
 553                 switch (_NSIG_WORDS) {
 554                 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 555                 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 556                 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 557                 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 558                 }
 559                 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 560                         return -EFAULT;
 561         }
 562         return ret;
 563 }
 564
 565 asmlinkage long
 566 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 567 {
 568         siginfo_t info;
 569         int ret;
 570         mm_segment_t old_fs = get_fs();
 571
 572         if (copy_siginfo_from_user32(&info, uinfo))
 573                 return -EFAULT;
 574         set_fs (KERNEL_DS);
 575         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
 576         set_fs (old_fs);
 577         return ret;
 578 }
 579
 580 /* These are here just in case some old ia32 binary calls it. */
 581 asmlinkage long
 582 sys32_pause(void)
 583 {
 584         current->state = TASK_INTERRUPTIBLE;
 585         schedule();
 586         return -ERESTARTNOHAND;
 587 }
 588
 589
 590 #ifdef CONFIG_SYSCTL_SYSCALL
 591 struct sysctl_ia32 {
 592         unsigned int    name;
 593         int             nlen;
 594         unsigned int    oldval;
 595         unsigned int    oldlenp;
 596         unsigned int    newval;
 597         unsigned int    newlen;
 598         unsigned int    __unused[4];
 599 };
 600
 601
 602 asmlinkage long
 603 sys32_sysctl(struct sysctl_ia32 __user *args32)
 604 {
 605         struct sysctl_ia32 a32;
 606         mm_segment_t old_fs = get_fs ();
 607         void __user *oldvalp, *newvalp;
 608         size_t oldlen;
 609         int __user *namep;
 610         long ret;
 611
 612         if (copy_from_user(&a32, args32, sizeof (a32)))
 613                 return -EFAULT;
 614
 615         /*
 616          * We need to pre-validate these because we have to disable address checking
 617          * before calling do_sysctl() because of OLDLEN but we can't run the risk of the
 618          * user specifying bad addresses here.  Well, since we're dealing with 32 bit
 619          * addresses, we KNOW that access_ok() will always succeed, so this is an
 620          * expensive NOP, but so what...
 621          */
 622         namep = compat_ptr(a32.name);
 623         oldvalp = compat_ptr(a32.oldval);
 624         newvalp =  compat_ptr(a32.newval);
 625
 626         if ((oldvalp && get_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
 627             || !access_ok(VERIFY_WRITE, namep, 0)
 628             || !access_ok(VERIFY_WRITE, oldvalp, 0)
 629             || !access_ok(VERIFY_WRITE, newvalp, 0))
 630                 return -EFAULT;
 631
 632         set_fs(KERNEL_DS);
 633         lock_kernel();
 634         ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
 635                         newvalp, (size_t) a32.newlen);
 636         unlock_kernel();
 637         set_fs(old_fs);
 638
 639         if (oldvalp && put_user (oldlen, (int __user *)compat_ptr(a32.oldlenp)))
 640                 return -EFAULT;
 641
 642         return ret;
 643 }
 644 #endif
 645
 646 /* warning: next two assume little endian */
 647 asmlinkage long
 648 sys32_pread(unsigned int fd, char __user *ubuf, u32 count, u32 poslo, u32 poshi)
 649 {
 650         return sys_pread64(fd, ubuf, count,
 651                          ((loff_t)AA(poshi) << 32) | AA(poslo));
 652 }
 653
 654 asmlinkage long
 655 sys32_pwrite(unsigned int fd, char __user *ubuf, u32 count, u32 poslo, u32 poshi)
 656 {
 657         return sys_pwrite64(fd, ubuf, count,
 658                           ((loff_t)AA(poshi) << 32) | AA(poslo));
 659 }
 660
 661
 662 asmlinkage long
 663 sys32_personality(unsigned long personality)
 664 {
 665         int ret;
 666         if (personality(current->personality) == PER_LINUX32 &&
 667                 personality == PER_LINUX)
 668                 personality = PER_LINUX32;
 669         ret = sys_personality(personality);
 670         if (ret == PER_LINUX32)
 671                 ret = PER_LINUX;
 672         return ret;
 673 }
 674
 675 asmlinkage long
 676 sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 677 {
 678         mm_segment_t old_fs = get_fs();
 679         int ret;
 680         off_t of;
 681
 682         if (offset && get_user(of, offset))
 683                 return -EFAULT;
 684
 685         set_fs(KERNEL_DS);
 686         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
 687                            count);
 688         set_fs(old_fs);
 689
 690         if (offset && put_user(of, offset))
 691                 return -EFAULT;
 692
 693         return ret;
 694 }
 695
 696 asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
 697         unsigned long prot, unsigned long flags,
 698         unsigned long fd, unsigned long pgoff)
 699 {
 700         struct mm_struct *mm = current->mm;
 701         unsigned long error;
 702         struct file * file = NULL;
 703
 704         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 705         if (!(flags & MAP_ANONYMOUS)) {
 706                 file = fget(fd);
 707                 if (!file)
 708                         return -EBADF;
 709         }
 710
 711         down_write(&mm->mmap_sem);
 712         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 713         up_write(&mm->mmap_sem);
 714
 715         if (file)
 716                 fput(file);
 717         return error;
 718 }
 719
 720 asmlinkage long sys32_olduname(struct oldold_utsname __user * name)
 721 {
 722         int err;
 723
 724         if (!name)
 725                 return -EFAULT;
 726         if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
 727                 return -EFAULT;
 728
 729         down_read(&uts_sem);
 730
 731         err = __copy_to_user(&name->sysname,&utsname()->sysname,
 732                                 __OLD_UTS_LEN);
 733         err |= __put_user(0,name->sysname+__OLD_UTS_LEN);
 734         err |= __copy_to_user(&name->nodename,&utsname()->nodename,
 735                                 __OLD_UTS_LEN);
 736         err |= __put_user(0,name->nodename+__OLD_UTS_LEN);
 737         err |= __copy_to_user(&name->release,&utsname()->release,
 738                                 __OLD_UTS_LEN);
 739         err |= __put_user(0,name->release+__OLD_UTS_LEN);
 740         err |= __copy_to_user(&name->version,&utsname()->version,
 741                                 __OLD_UTS_LEN);
 742         err |= __put_user(0,name->version+__OLD_UTS_LEN);
 743         {
 744                 char *arch = "x86_64";
 745                 if (personality(current->personality) == PER_LINUX32)
 746                         arch = "i686";
 747
 748                 err |= __copy_to_user(&name->machine, arch, strlen(arch)+1);
 749         }
 750
 751         up_read(&uts_sem);
 752
 753         err = err ? -EFAULT : 0;
 754
 755         return err;
 756 }
 757
 758 long sys32_uname(struct old_utsname __user * name)
 759 {
 760         int err;
 761         if (!name)
 762                 return -EFAULT;
 763         down_read(&uts_sem);
 764         err = copy_to_user(name, utsname(), sizeof (*name));
 765         up_read(&uts_sem);
 766         if (personality(current->personality) == PER_LINUX32)
 767                 err |= copy_to_user(&name->machine, "i686", 5);
 768         return err?-EFAULT:0;
 769 }
 770
 771 long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
 772 {
 773         struct ustat u;
 774         mm_segment_t seg;
 775         int ret;
 776
 777         seg = get_fs();
 778         set_fs(KERNEL_DS);
 779         ret = sys_ustat(dev, (struct ustat __user *)&u);
 780         set_fs(seg);
 781         if (ret >= 0) {
 782                 if (!access_ok(VERIFY_WRITE,u32p,sizeof(struct ustat32)) ||
 783                     __put_user((__u32) u.f_tfree, &u32p->f_tfree) ||
 784                     __put_user((__u32) u.f_tinode, &u32p->f_tfree) ||
 785                     __copy_to_user(&u32p->f_fname, u.f_fname, sizeof(u.f_fname)) ||
 786                     __copy_to_user(&u32p->f_fpack, u.f_fpack, sizeof(u.f_fpack)))
 787                         ret = -EFAULT;
 788         }
 789         return ret;
 790 }
 791
 792 asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
 793                              compat_uptr_t __user *envp, struct pt_regs *regs)
 794 {
 795         long error;
 796         char * filename;
 797
 798         filename = getname(name);
 799         error = PTR_ERR(filename);
 800         if (IS_ERR(filename))
 801                 return error;
 802         error = compat_do_execve(filename, argv, envp, regs);
 803         if (error == 0) {
 804                 task_lock(current);
 805                 current->ptrace &= ~PT_DTRACE;
 806                 task_unlock(current);
 807         }
 808         putname(filename);
 809         return error;
 810 }
 811
 812 asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
 813                             struct pt_regs *regs)
 814 {
 815         void __user *parent_tid = (void __user *)regs->rdx;
 816         void __user *child_tid = (void __user *)regs->rdi;
 817         if (!newsp)
 818                 newsp = regs->rsp;
 819         return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
 820 }
 821
 822 /*
 823  * Some system calls that need sign extended arguments. This could be done by a generic wrapper.
 824  */
 825
 826 long sys32_lseek (unsigned int fd, int offset, unsigned int whence)
 827 {
 828         return sys_lseek(fd, offset, whence);
 829 }
 830
 831 long sys32_kill(int pid, int sig)
 832 {
 833         return sys_kill(pid, sig);
 834 }
 835
 836 long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
 837                         __u32 len_low, __u32 len_high, int advice)
 838 {
 839         return sys_fadvise64_64(fd,
 840                                (((u64)offset_high)<<32) | offset_low,
 841                                (((u64)len_high)<<32) | len_low,
 842                                advice);
 843 }
 844
 845 long sys32_vm86_warning(void)
 846 {
 847         struct task_struct *me = current;
 848         static char lastcomm[sizeof(me->comm)];
 849         if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
 850                 compat_printk(KERN_INFO "%s: vm86 mode not supported on 64 bit kernel\n",
 851                        me->comm);
 852                 strncpy(lastcomm, me->comm, sizeof(lastcomm));
 853         }
 854         return -ENOSYS;
 855 }
 856
 857 long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
 858                           char __user * buf, size_t len)
 859 {
 860         return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 861 }
 862
 863 asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
 864 {
 865         return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
 866 }
 867
 868 asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
 869                            unsigned n_low, unsigned n_hi,  int flags)
 870 {
 871         return sys_sync_file_range(fd,
 872                                    ((u64)off_hi << 32) | off_low,
 873                                    ((u64)n_hi << 32) | n_low, flags);
 874 }
 875
 876 asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
 877                      int advice)
 878 {
 879         return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
 880                                 len, advice);
 881 }
 882
 883 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
 884                                 unsigned offset_hi, unsigned len_lo,
 885                                 unsigned len_hi)
 886 {
 887         return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
 888                              ((u64)len_hi << 32) | len_lo);
 889 }