kernel/compat.c

   1 /*
   2  *  linux/kernel/compat.c
   3  *
   4  *  Kernel compatibililty routines for e.g. 32 bit syscall support
   5  *  on 64 bit kernels.
   6  *
   7  *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/linkage.h>
  15 #include <linux/compat.h>
  16 #include <linux/errno.h>
  17 #include <linux/time.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>        /* for MAX_SCHEDULE_TIMEOUT */
  20 #include <linux/syscalls.h>
  21 #include <linux/unistd.h>
  22 #include <linux/security.h>
  23 #include <linux/timex.h>
  24 #include <linux/migrate.h>
  25 #include <linux/posix-timers.h>
  26 #include <linux/times.h>
  27 #include <linux/ptrace.h>
  28
  29 #include <asm/uaccess.h>
  30
  31 /*
  32  * Note that the native side is already converted to a timespec, because
  33  * that's what we want anyway.
  34  */
  35 static int compat_get_timeval(struct timespec *o,
  36                 struct compat_timeval __user *i)
  37 {
  38         long usec;
  39
  40         if (get_user(o->tv_sec, &i->tv_sec) ||
  41             get_user(usec, &i->tv_usec))
  42                 return -EFAULT;
  43         o->tv_nsec = usec * 1000;
  44         return 0;
  45 }
  46
  47 static int compat_put_timeval(struct compat_timeval __user *o,
  48                 struct timeval *i)
  49 {
  50         return (put_user(i->tv_sec, &o->tv_sec) ||
  51                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  52 }
  53
  54 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
  55                 struct timezone __user *tz)
  56 {
  57         if (tv) {
  58                 struct timeval ktv;
  59                 do_gettimeofday(&ktv);
  60                 if (compat_put_timeval(tv, &ktv))
  61                         return -EFAULT;
  62         }
  63         if (tz) {
  64                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
  65                         return -EFAULT;
  66         }
  67
  68         return 0;
  69 }
  70
  71 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
  72                 struct timezone __user *tz)
  73 {
  74         struct timespec kts;
  75         struct timezone ktz;
  76
  77         if (tv) {
  78                 if (compat_get_timeval(&kts, tv))
  79                         return -EFAULT;
  80         }
  81         if (tz) {
  82                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
  83                         return -EFAULT;
  84         }
  85
  86         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
  87 }
  88
  89 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  90 {
  91         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  92                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  93                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  94 }
  95
  96 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  97 {
  98         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  99                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 100                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 101 }
 102
 103 static long compat_nanosleep_restart(struct restart_block *restart)
 104 {
 105         struct compat_timespec __user *rmtp;
 106         struct timespec rmt;
 107         mm_segment_t oldfs;
 108         long ret;
 109
 110         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 111         oldfs = get_fs();
 112         set_fs(KERNEL_DS);
 113         ret = hrtimer_nanosleep_restart(restart);
 114         set_fs(oldfs);
 115
 116         if (ret) {
 117                 rmtp = restart->nanosleep.compat_rmtp;
 118
 119                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 120                         return -EFAULT;
 121         }
 122
 123         return ret;
 124 }
 125
 126 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 127                                      struct compat_timespec __user *rmtp)
 128 {
 129         struct timespec tu, rmt;
 130         mm_segment_t oldfs;
 131         long ret;
 132
 133         if (get_compat_timespec(&tu, rqtp))
 134                 return -EFAULT;
 135
 136         if (!timespec_valid(&tu))
 137                 return -EINVAL;
 138
 139         oldfs = get_fs();
 140         set_fs(KERNEL_DS);
 141         ret = hrtimer_nanosleep(&tu,
 142                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 143                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 144         set_fs(oldfs);
 145
 146         if (ret) {
 147                 struct restart_block *restart
 148                         = &current_thread_info()->restart_block;
 149
 150                 restart->fn = compat_nanosleep_restart;
 151                 restart->nanosleep.compat_rmtp = rmtp;
 152
 153                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 154                         return -EFAULT;
 155         }
 156
 157         return ret;
 158 }
 159
 160 static inline long get_compat_itimerval(struct itimerval *o,
 161                 struct compat_itimerval __user *i)
 162 {
 163         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 164                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 165                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 166                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 167                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 168 }
 169
 170 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 171                 struct itimerval *i)
 172 {
 173         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 174                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 175                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 176                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 177                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 178 }
 179
 180 asmlinkage long compat_sys_getitimer(int which,
 181                 struct compat_itimerval __user *it)
 182 {
 183         struct itimerval kit;
 184         int error;
 185
 186         error = do_getitimer(which, &kit);
 187         if (!error && put_compat_itimerval(it, &kit))
 188                 error = -EFAULT;
 189         return error;
 190 }
 191
 192 asmlinkage long compat_sys_setitimer(int which,
 193                 struct compat_itimerval __user *in,
 194                 struct compat_itimerval __user *out)
 195 {
 196         struct itimerval kin, kout;
 197         int error;
 198
 199         if (in) {
 200                 if (get_compat_itimerval(&kin, in))
 201                         return -EFAULT;
 202         } else
 203                 memset(&kin, 0, sizeof(kin));
 204
 205         error = do_setitimer(which, &kin, out ? &kout : NULL);
 206         if (error || !out)
 207                 return error;
 208         if (put_compat_itimerval(out, &kout))
 209                 return -EFAULT;
 210         return 0;
 211 }
 212
 213 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 214 {
 215         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 216 }
 217
 218 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 219 {
 220         if (tbuf) {
 221                 struct tms tms;
 222                 struct compat_tms tmp;
 223
 224                 do_sys_times(&tms);
 225                 /* Convert our struct tms to the compat version. */
 226                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 227                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 228                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 229                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 230                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 231                         return -EFAULT;
 232         }
 233         force_successful_syscall_return();
 234         return compat_jiffies_to_clock_t(jiffies);
 235 }
 236
 237 /*
 238  * Assumption: old_sigset_t and compat_old_sigset_t are both
 239  * types that can be passed to put_user()/get_user().
 240  */
 241
 242 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 243 {
 244         old_sigset_t s;
 245         long ret;
 246         mm_segment_t old_fs = get_fs();
 247
 248         set_fs(KERNEL_DS);
 249         ret = sys_sigpending((old_sigset_t __user *) &s);
 250         set_fs(old_fs);
 251         if (ret == 0)
 252                 ret = put_user(s, set);
 253         return ret;
 254 }
 255
 256 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 257                 compat_old_sigset_t __user *oset)
 258 {
 259         old_sigset_t s;
 260         long ret;
 261         mm_segment_t old_fs;
 262
 263         if (set && get_user(s, set))
 264                 return -EFAULT;
 265         old_fs = get_fs();
 266         set_fs(KERNEL_DS);
 267         ret = sys_sigprocmask(how,
 268                               set ? (old_sigset_t __user *) &s : NULL,
 269                               oset ? (old_sigset_t __user *) &s : NULL);
 270         set_fs(old_fs);
 271         if (ret == 0)
 272                 if (oset)
 273                         ret = put_user(s, oset);
 274         return ret;
 275 }
 276
 277 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 278                 struct compat_rlimit __user *rlim)
 279 {
 280         struct rlimit r;
 281         int ret;
 282         mm_segment_t old_fs = get_fs ();
 283
 284         if (resource >= RLIM_NLIMITS)
 285                 return -EINVAL;
 286
 287         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 288             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 289             __get_user(r.rlim_max, &rlim->rlim_max))
 290                 return -EFAULT;
 291
 292         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 293                 r.rlim_cur = RLIM_INFINITY;
 294         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 295                 r.rlim_max = RLIM_INFINITY;
 296         set_fs(KERNEL_DS);
 297         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 298         set_fs(old_fs);
 299         return ret;
 300 }
 301
 302 #ifdef COMPAT_RLIM_OLD_INFINITY
 303
 304 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 305                 struct compat_rlimit __user *rlim)
 306 {
 307         struct rlimit r;
 308         int ret;
 309         mm_segment_t old_fs = get_fs();
 310
 311         set_fs(KERNEL_DS);
 312         ret = sys_old_getrlimit(resource, &r);
 313         set_fs(old_fs);
 314
 315         if (!ret) {
 316                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 317                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 318                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 319                         r.rlim_max = COMPAT_RLIM_INFINITY;
 320
 321                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 322                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 323                     __put_user(r.rlim_max, &rlim->rlim_max))
 324                         return -EFAULT;
 325         }
 326         return ret;
 327 }
 328
 329 #endif
 330
 331 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 332                 struct compat_rlimit __user *rlim)
 333 {
 334         struct rlimit r;
 335         int ret;
 336         mm_segment_t old_fs = get_fs();
 337
 338         set_fs(KERNEL_DS);
 339         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 340         set_fs(old_fs);
 341         if (!ret) {
 342                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 343                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 344                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 345                         r.rlim_max = COMPAT_RLIM_INFINITY;
 346
 347                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 348                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 349                     __put_user(r.rlim_max, &rlim->rlim_max))
 350                         return -EFAULT;
 351         }
 352         return ret;
 353 }
 354
 355 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 356 {
 357         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 358             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 359             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 360             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 361             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 362             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 363             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 364             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 365             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 366             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 367             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 368             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 369             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 370             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 371             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 372             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 373             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 374             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 375             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 376                 return -EFAULT;
 377         return 0;
 378 }
 379
 380 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 381 {
 382         struct rusage r;
 383         int ret;
 384         mm_segment_t old_fs = get_fs();
 385
 386         set_fs(KERNEL_DS);
 387         ret = sys_getrusage(who, (struct rusage __user *) &r);
 388         set_fs(old_fs);
 389
 390         if (ret)
 391                 return ret;
 392
 393         if (put_compat_rusage(&r, ru))
 394                 return -EFAULT;
 395
 396         return 0;
 397 }
 398
 399 asmlinkage long
 400 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 401         struct compat_rusage __user *ru)
 402 {
 403         if (!ru) {
 404                 return sys_wait4(pid, stat_addr, options, NULL);
 405         } else {
 406                 struct rusage r;
 407                 int ret;
 408                 unsigned int status;
 409                 mm_segment_t old_fs = get_fs();
 410
 411                 set_fs (KERNEL_DS);
 412                 ret = sys_wait4(pid,
 413                                 (stat_addr ?
 414                                  (unsigned int __user *) &status : NULL),
 415                                 options, (struct rusage __user *) &r);
 416                 set_fs (old_fs);
 417
 418                 if (ret > 0) {
 419                         if (put_compat_rusage(&r, ru))
 420                                 return -EFAULT;
 421                         if (stat_addr && put_user(status, stat_addr))
 422                                 return -EFAULT;
 423                 }
 424                 return ret;
 425         }
 426 }
 427
 428 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 429                 struct compat_siginfo __user *uinfo, int options,
 430                 struct compat_rusage __user *uru)
 431 {
 432         siginfo_t info;
 433         struct rusage ru;
 434         long ret;
 435         mm_segment_t old_fs = get_fs();
 436
 437         memset(&info, 0, sizeof(info));
 438
 439         set_fs(KERNEL_DS);
 440         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 441                          uru ? (struct rusage __user *)&ru : NULL);
 442         set_fs(old_fs);
 443
 444         if ((ret < 0) || (info.si_signo == 0))
 445                 return ret;
 446
 447         if (uru) {
 448                 ret = put_compat_rusage(&ru, uru);
 449                 if (ret)
 450                         return ret;
 451         }
 452
 453         BUG_ON(info.si_code & __SI_MASK);
 454         info.si_code |= __SI_CHLD;
 455         return copy_siginfo_to_user32(uinfo, &info);
 456 }
 457
 458 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 459                                     unsigned len, struct cpumask *new_mask)
 460 {
 461         unsigned long *k;
 462
 463         if (len < cpumask_size())
 464                 memset(new_mask, 0, cpumask_size());
 465         else if (len > cpumask_size())
 466                 len = cpumask_size();
 467
 468         k = cpumask_bits(new_mask);
 469         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 470 }
 471
 472 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 473                                              unsigned int len,
 474                                              compat_ulong_t __user *user_mask_ptr)
 475 {
 476         cpumask_var_t new_mask;
 477         int retval;
 478
 479         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 480                 return -ENOMEM;
 481
 482         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 483         if (retval)
 484                 goto out;
 485
 486         retval = sched_setaffinity(pid, new_mask);
 487 out:
 488         free_cpumask_var(new_mask);
 489         return retval;
 490 }
 491
 492 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 493                                              compat_ulong_t __user *user_mask_ptr)
 494 {
 495         int ret;
 496         cpumask_var_t mask;
 497         unsigned long *k;
 498         unsigned int min_length = cpumask_size();
 499
 500         if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
 501                 min_length = sizeof(compat_ulong_t);
 502
 503         if (len < min_length)
 504                 return -EINVAL;
 505
 506         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 507                 return -ENOMEM;
 508
 509         ret = sched_getaffinity(pid, mask);
 510         if (ret < 0)
 511                 goto out;
 512
 513         k = cpumask_bits(mask);
 514         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 515         if (ret == 0)
 516                 ret = min_length;
 517
 518 out:
 519         free_cpumask_var(mask);
 520         return ret;
 521 }
 522
 523 int get_compat_itimerspec(struct itimerspec *dst,
 524                           const struct compat_itimerspec __user *src)
 525 {
 526         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 527             get_compat_timespec(&dst->it_value, &src->it_value))
 528                 return -EFAULT;
 529         return 0;
 530 }
 531
 532 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 533                           const struct itimerspec *src)
 534 {
 535         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 536             put_compat_timespec(&src->it_value, &dst->it_value))
 537                 return -EFAULT;
 538         return 0;
 539 }
 540
 541 long compat_sys_timer_create(clockid_t which_clock,
 542                         struct compat_sigevent __user *timer_event_spec,
 543                         timer_t __user *created_timer_id)
 544 {
 545         struct sigevent __user *event = NULL;
 546
 547         if (timer_event_spec) {
 548                 struct sigevent kevent;
 549
 550                 event = compat_alloc_user_space(sizeof(*event));
 551                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 552                     copy_to_user(event, &kevent, sizeof(*event)))
 553                         return -EFAULT;
 554         }
 555
 556         return sys_timer_create(which_clock, event, created_timer_id);
 557 }
 558
 559 long compat_sys_timer_settime(timer_t timer_id, int flags,
 560                           struct compat_itimerspec __user *new,
 561                           struct compat_itimerspec __user *old)
 562 {
 563         long err;
 564         mm_segment_t oldfs;
 565         struct itimerspec newts, oldts;
 566
 567         if (!new)
 568                 return -EINVAL;
 569         if (get_compat_itimerspec(&newts, new))
 570                 return -EFAULT;
 571         oldfs = get_fs();
 572         set_fs(KERNEL_DS);
 573         err = sys_timer_settime(timer_id, flags,
 574                                 (struct itimerspec __user *) &newts,
 575                                 (struct itimerspec __user *) &oldts);
 576         set_fs(oldfs);
 577         if (!err && old && put_compat_itimerspec(old, &oldts))
 578                 return -EFAULT;
 579         return err;
 580 }
 581
 582 long compat_sys_timer_gettime(timer_t timer_id,
 583                 struct compat_itimerspec __user *setting)
 584 {
 585         long err;
 586         mm_segment_t oldfs;
 587         struct itimerspec ts;
 588
 589         oldfs = get_fs();
 590         set_fs(KERNEL_DS);
 591         err = sys_timer_gettime(timer_id,
 592                                 (struct itimerspec __user *) &ts);
 593         set_fs(oldfs);
 594         if (!err && put_compat_itimerspec(setting, &ts))
 595                 return -EFAULT;
 596         return err;
 597 }
 598
 599 long compat_sys_clock_settime(clockid_t which_clock,
 600                 struct compat_timespec __user *tp)
 601 {
 602         long err;
 603         mm_segment_t oldfs;
 604         struct timespec ts;
 605
 606         if (get_compat_timespec(&ts, tp))
 607                 return -EFAULT;
 608         oldfs = get_fs();
 609         set_fs(KERNEL_DS);
 610         err = sys_clock_settime(which_clock,
 611                                 (struct timespec __user *) &ts);
 612         set_fs(oldfs);
 613         return err;
 614 }
 615
 616 long compat_sys_clock_gettime(clockid_t which_clock,
 617                 struct compat_timespec __user *tp)
 618 {
 619         long err;
 620         mm_segment_t oldfs;
 621         struct timespec ts;
 622
 623         oldfs = get_fs();
 624         set_fs(KERNEL_DS);
 625         err = sys_clock_gettime(which_clock,
 626                                 (struct timespec __user *) &ts);
 627         set_fs(oldfs);
 628         if (!err && put_compat_timespec(&ts, tp))
 629                 return -EFAULT;
 630         return err;
 631 }
 632
 633 long compat_sys_clock_getres(clockid_t which_clock,
 634                 struct compat_timespec __user *tp)
 635 {
 636         long err;
 637         mm_segment_t oldfs;
 638         struct timespec ts;
 639
 640         oldfs = get_fs();
 641         set_fs(KERNEL_DS);
 642         err = sys_clock_getres(which_clock,
 643                                (struct timespec __user *) &ts);
 644         set_fs(oldfs);
 645         if (!err && tp && put_compat_timespec(&ts, tp))
 646                 return -EFAULT;
 647         return err;
 648 }
 649
 650 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 651 {
 652         long err;
 653         mm_segment_t oldfs;
 654         struct timespec tu;
 655         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 656
 657         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 658         oldfs = get_fs();
 659         set_fs(KERNEL_DS);
 660         err = clock_nanosleep_restart(restart);
 661         set_fs(oldfs);
 662
 663         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 664             put_compat_timespec(&tu, rmtp))
 665                 return -EFAULT;
 666
 667         if (err == -ERESTART_RESTARTBLOCK) {
 668                 restart->fn = compat_clock_nanosleep_restart;
 669                 restart->nanosleep.compat_rmtp = rmtp;
 670         }
 671         return err;
 672 }
 673
 674 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 675                             struct compat_timespec __user *rqtp,
 676                             struct compat_timespec __user *rmtp)
 677 {
 678         long err;
 679         mm_segment_t oldfs;
 680         struct timespec in, out;
 681         struct restart_block *restart;
 682
 683         if (get_compat_timespec(&in, rqtp))
 684                 return -EFAULT;
 685
 686         oldfs = get_fs();
 687         set_fs(KERNEL_DS);
 688         err = sys_clock_nanosleep(which_clock, flags,
 689                                   (struct timespec __user *) &in,
 690                                   (struct timespec __user *) &out);
 691         set_fs(oldfs);
 692
 693         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 694             put_compat_timespec(&out, rmtp))
 695                 return -EFAULT;
 696
 697         if (err == -ERESTART_RESTARTBLOCK) {
 698                 restart = &current_thread_info()->restart_block;
 699                 restart->fn = compat_clock_nanosleep_restart;
 700                 restart->nanosleep.compat_rmtp = rmtp;
 701         }
 702         return err;
 703 }
 704
 705 /*
 706  * We currently only need the following fields from the sigevent
 707  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 708  * sigev_notify_thread_id).  The others are handled in user mode.
 709  * We also assume that copying sigev_value.sival_int is sufficient
 710  * to keep all the bits of sigev_value.sival_ptr intact.
 711  */
 712 int get_compat_sigevent(struct sigevent *event,
 713                 const struct compat_sigevent __user *u_event)
 714 {
 715         memset(event, 0, sizeof(*event));
 716         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 717                 __get_user(event->sigev_value.sival_int,
 718                         &u_event->sigev_value.sival_int) ||
 719                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 720                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 721                 __get_user(event->sigev_notify_thread_id,
 722                         &u_event->sigev_notify_thread_id))
 723                 ? -EFAULT : 0;
 724 }
 725
 726 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 727                        unsigned long bitmap_size)
 728 {
 729         int i, j;
 730         unsigned long m;
 731         compat_ulong_t um;
 732         unsigned long nr_compat_longs;
 733
 734         /* align bitmap up to nearest compat_long_t boundary */
 735         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 736
 737         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 738                 return -EFAULT;
 739
 740         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 741
 742         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 743                 m = 0;
 744
 745                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 746                         /*
 747                          * We dont want to read past the end of the userspace
 748                          * bitmap. We must however ensure the end of the
 749                          * kernel bitmap is zeroed.
 750                          */
 751                         if (nr_compat_longs-- > 0) {
 752                                 if (__get_user(um, umask))
 753                                         return -EFAULT;
 754                         } else {
 755                                 um = 0;
 756                         }
 757
 758                         umask++;
 759                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 760                 }
 761                 *mask++ = m;
 762         }
 763
 764         return 0;
 765 }
 766
 767 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 768                        unsigned long bitmap_size)
 769 {
 770         int i, j;
 771         unsigned long m;
 772         compat_ulong_t um;
 773         unsigned long nr_compat_longs;
 774
 775         /* align bitmap up to nearest compat_long_t boundary */
 776         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 777
 778         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 779                 return -EFAULT;
 780
 781         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 782
 783         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 784                 m = *mask++;
 785
 786                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 787                         um = m;
 788
 789                         /*
 790                          * We dont want to write past the end of the userspace
 791                          * bitmap.
 792                          */
 793                         if (nr_compat_longs-- > 0) {
 794                                 if (__put_user(um, umask))
 795                                         return -EFAULT;
 796                         }
 797
 798                         umask++;
 799                         m >>= 4*sizeof(um);
 800                         m >>= 4*sizeof(um);
 801                 }
 802         }
 803
 804         return 0;
 805 }
 806
 807 void
 808 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 809 {
 810         switch (_NSIG_WORDS) {
 811         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 812         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 813         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 814         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 815         }
 816 }
 817
 818 asmlinkage long
 819 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 820                 struct compat_siginfo __user *uinfo,
 821                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 822 {
 823         compat_sigset_t s32;
 824         sigset_t s;
 825         int sig;
 826         struct timespec t;
 827         siginfo_t info;
 828         long ret, timeout = 0;
 829
 830         if (sigsetsize != sizeof(sigset_t))
 831                 return -EINVAL;
 832
 833         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 834                 return -EFAULT;
 835         sigset_from_compat(&s, &s32);
 836         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 837         signotset(&s);
 838
 839         if (uts) {
 840                 if (get_compat_timespec (&t, uts))
 841                         return -EFAULT;
 842                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 843                                 || t.tv_sec < 0)
 844                         return -EINVAL;
 845         }
 846
 847         spin_lock_irq(&current->sighand->siglock);
 848         sig = dequeue_signal(current, &s, &info);
 849         if (!sig) {
 850                 timeout = MAX_SCHEDULE_TIMEOUT;
 851                 if (uts)
 852                         timeout = timespec_to_jiffies(&t)
 853                                 +(t.tv_sec || t.tv_nsec);
 854                 if (timeout) {
 855                         current->real_blocked = current->blocked;
 856                         sigandsets(&current->blocked, &current->blocked, &s);
 857
 858                         recalc_sigpending();
 859                         spin_unlock_irq(&current->sighand->siglock);
 860
 861                         timeout = schedule_timeout_interruptible(timeout);
 862
 863                         spin_lock_irq(&current->sighand->siglock);
 864                         sig = dequeue_signal(current, &s, &info);
 865                         current->blocked = current->real_blocked;
 866                         siginitset(&current->real_blocked, 0);
 867                         recalc_sigpending();
 868                 }
 869         }
 870         spin_unlock_irq(&current->sighand->siglock);
 871
 872         if (sig) {
 873                 ret = sig;
 874                 if (uinfo) {
 875                         if (copy_siginfo_to_user32(uinfo, &info))
 876                                 ret = -EFAULT;
 877                 }
 878         }else {
 879                 ret = timeout?-EINTR:-EAGAIN;
 880         }
 881         return ret;
 882
 883 }
 884
 885 asmlinkage long
 886 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 887                              struct compat_siginfo __user *uinfo)
 888 {
 889         siginfo_t info;
 890
 891         if (copy_siginfo_from_user32(&info, uinfo))
 892                 return -EFAULT;
 893         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 894 }
 895
 896 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 897
 898 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 899
 900 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 901 {
 902         compat_time_t i;
 903         struct timeval tv;
 904
 905         do_gettimeofday(&tv);
 906         i = tv.tv_sec;
 907
 908         if (tloc) {
 909                 if (put_user(i,tloc))
 910                         return -EFAULT;
 911         }
 912         force_successful_syscall_return();
 913         return i;
 914 }
 915
 916 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 917 {
 918         struct timespec tv;
 919         int err;
 920
 921         if (get_user(tv.tv_sec, tptr))
 922                 return -EFAULT;
 923
 924         tv.tv_nsec = 0;
 925
 926         err = security_settime(&tv, NULL);
 927         if (err)
 928                 return err;
 929
 930         do_settimeofday(&tv);
 931         return 0;
 932 }
 933
 934 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 935
 936 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 937 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 938 {
 939         sigset_t newset;
 940         compat_sigset_t newset32;
 941
 942         /* XXX: Don't preclude handling different sized sigset_t's.  */
 943         if (sigsetsize != sizeof(sigset_t))
 944                 return -EINVAL;
 945
 946         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 947                 return -EFAULT;
 948         sigset_from_compat(&newset, &newset32);
 949         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 950
 951         spin_lock_irq(&current->sighand->siglock);
 952         current->saved_sigmask = current->blocked;
 953         current->blocked = newset;
 954         recalc_sigpending();
 955         spin_unlock_irq(&current->sighand->siglock);
 956
 957         current->state = TASK_INTERRUPTIBLE;
 958         schedule();
 959         set_restore_sigmask();
 960         return -ERESTARTNOHAND;
 961 }
 962 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 963
 964 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 965 {
 966         struct timex txc;
 967         int ret;
 968
 969         memset(&txc, 0, sizeof(struct timex));
 970
 971         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 972                         __get_user(txc.modes, &utp->modes) ||
 973                         __get_user(txc.offset, &utp->offset) ||
 974                         __get_user(txc.freq, &utp->freq) ||
 975                         __get_user(txc.maxerror, &utp->maxerror) ||
 976                         __get_user(txc.esterror, &utp->esterror) ||
 977                         __get_user(txc.status, &utp->status) ||
 978                         __get_user(txc.constant, &utp->constant) ||
 979                         __get_user(txc.precision, &utp->precision) ||
 980                         __get_user(txc.tolerance, &utp->tolerance) ||
 981                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 982                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 983                         __get_user(txc.tick, &utp->tick) ||
 984                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 985                         __get_user(txc.jitter, &utp->jitter) ||
 986                         __get_user(txc.shift, &utp->shift) ||
 987                         __get_user(txc.stabil, &utp->stabil) ||
 988                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 989                         __get_user(txc.calcnt, &utp->calcnt) ||
 990                         __get_user(txc.errcnt, &utp->errcnt) ||
 991                         __get_user(txc.stbcnt, &utp->stbcnt))
 992                 return -EFAULT;
 993
 994         ret = do_adjtimex(&txc);
 995
 996         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 997                         __put_user(txc.modes, &utp->modes) ||
 998                         __put_user(txc.offset, &utp->offset) ||
 999                         __put_user(txc.freq, &utp->freq) ||
1000                         __put_user(txc.maxerror, &utp->maxerror) ||
1001                         __put_user(txc.esterror, &utp->esterror) ||
1002                         __put_user(txc.status, &utp->status) ||
1003                         __put_user(txc.constant, &utp->constant) ||
1004                         __put_user(txc.precision, &utp->precision) ||
1005                         __put_user(txc.tolerance, &utp->tolerance) ||
1006                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1007                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1008                         __put_user(txc.tick, &utp->tick) ||
1009                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1010                         __put_user(txc.jitter, &utp->jitter) ||
1011                         __put_user(txc.shift, &utp->shift) ||
1012                         __put_user(txc.stabil, &utp->stabil) ||
1013                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1014                         __put_user(txc.calcnt, &utp->calcnt) ||
1015                         __put_user(txc.errcnt, &utp->errcnt) ||
1016                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1017                         __put_user(txc.tai, &utp->tai))
1018                 ret = -EFAULT;
1019
1020         return ret;
1021 }
1022
1023 #ifdef CONFIG_NUMA
1024 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1025                 compat_uptr_t __user *pages32,
1026                 const int __user *nodes,
1027                 int __user *status,
1028                 int flags)
1029 {
1030         const void __user * __user *pages;
1031         int i;
1032
1033         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034         for (i = 0; i < nr_pages; i++) {
1035                 compat_uptr_t p;
1036
1037                 if (get_user(p, pages32 + i) ||
1038                         put_user(compat_ptr(p), pages + i))
1039                         return -EFAULT;
1040         }
1041         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042 }
1043
1044 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045                         compat_ulong_t maxnode,
1046                         const compat_ulong_t __user *old_nodes,
1047                         const compat_ulong_t __user *new_nodes)
1048 {
1049         unsigned long __user *old = NULL;
1050         unsigned long __user *new = NULL;
1051         nodemask_t tmp_mask;
1052         unsigned long nr_bits;
1053         unsigned long size;
1054
1055         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057         if (old_nodes) {
1058                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059                         return -EFAULT;
1060                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061                 if (new_nodes)
1062                         new = old + size / sizeof(unsigned long);
1063                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064                         return -EFAULT;
1065         }
1066         if (new_nodes) {
1067                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068                         return -EFAULT;
1069                 if (new == NULL)
1070                         new = compat_alloc_user_space(size);
1071                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072                         return -EFAULT;
1073         }
1074         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075 }
1076 #endif
1077
1078 struct compat_sysinfo {
1079         s32 uptime;
1080         u32 loads[3];
1081         u32 totalram;
1082         u32 freeram;
1083         u32 sharedram;
1084         u32 bufferram;
1085         u32 totalswap;
1086         u32 freeswap;
1087         u16 procs;
1088         u16 pad;
1089         u32 totalhigh;
1090         u32 freehigh;
1091         u32 mem_unit;
1092         char _f[20-2*sizeof(u32)-sizeof(int)];
1093 };
1094
1095 asmlinkage long
1096 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097 {
1098         struct sysinfo s;
1099
1100         do_sysinfo(&s);
1101
1102         /* Check to see if any memory value is too large for 32-bit and scale
1103          *  down if needed
1104          */
1105         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106                 int bitcount = 0;
1107
1108                 while (s.mem_unit < PAGE_SIZE) {
1109                         s.mem_unit <<= 1;
1110                         bitcount++;
1111                 }
1112
1113                 s.totalram >>= bitcount;
1114                 s.freeram >>= bitcount;
1115                 s.sharedram >>= bitcount;
1116                 s.bufferram >>= bitcount;
1117                 s.totalswap >>= bitcount;
1118                 s.freeswap >>= bitcount;
1119                 s.totalhigh >>= bitcount;
1120                 s.freehigh >>= bitcount;
1121         }
1122
1123         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124             __put_user (s.uptime, &info->uptime) ||
1125             __put_user (s.loads[0], &info->loads[0]) ||
1126             __put_user (s.loads[1], &info->loads[1]) ||
1127             __put_user (s.loads[2], &info->loads[2]) ||
1128             __put_user (s.totalram, &info->totalram) ||
1129             __put_user (s.freeram, &info->freeram) ||
1130             __put_user (s.sharedram, &info->sharedram) ||
1131             __put_user (s.bufferram, &info->bufferram) ||
1132             __put_user (s.totalswap, &info->totalswap) ||
1133             __put_user (s.freeswap, &info->freeswap) ||
1134             __put_user (s.procs, &info->procs) ||
1135             __put_user (s.totalhigh, &info->totalhigh) ||
1136             __put_user (s.freehigh, &info->freehigh) ||
1137             __put_user (s.mem_unit, &info->mem_unit))
1138                 return -EFAULT;
1139
1140         return 0;
1141 }