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
  27 #include <asm/uaccess.h>
  28
  29 /*
  30  * Note that the native side is already converted to a timespec, because
  31  * that's what we want anyway.
  32  */
  33 static int compat_get_timeval(struct timespec *o,
  34                 struct compat_timeval __user *i)
  35 {
  36         long usec;
  37
  38         if (get_user(o->tv_sec, &i->tv_sec) ||
  39             get_user(usec, &i->tv_usec))
  40                 return -EFAULT;
  41         o->tv_nsec = usec * 1000;
  42         return 0;
  43 }
  44
  45 static int compat_put_timeval(struct compat_timeval __user *o,
  46                 struct timeval *i)
  47 {
  48         return (put_user(i->tv_sec, &o->tv_sec) ||
  49                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  50 }
  51
  52 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
  53                 struct timezone __user *tz)
  54 {
  55         if (tv) {
  56                 struct timeval ktv;
  57                 do_gettimeofday(&ktv);
  58                 if (compat_put_timeval(tv, &ktv))
  59                         return -EFAULT;
  60         }
  61         if (tz) {
  62                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
  63                         return -EFAULT;
  64         }
  65
  66         return 0;
  67 }
  68
  69 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
  70                 struct timezone __user *tz)
  71 {
  72         struct timespec kts;
  73         struct timezone ktz;
  74
  75         if (tv) {
  76                 if (compat_get_timeval(&kts, tv))
  77                         return -EFAULT;
  78         }
  79         if (tz) {
  80                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
  81                         return -EFAULT;
  82         }
  83
  84         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
  85 }
  86
  87 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  88 {
  89         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  90                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  91                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  92 }
  93
  94 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  95 {
  96         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  97                         __put_user(ts->tv_sec, &cts->tv_sec) ||
  98                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  99 }
 100
 101 static long compat_nanosleep_restart(struct restart_block *restart)
 102 {
 103         struct compat_timespec __user *rmtp;
 104         struct timespec rmt;
 105         mm_segment_t oldfs;
 106         long ret;
 107
 108         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 109         oldfs = get_fs();
 110         set_fs(KERNEL_DS);
 111         ret = hrtimer_nanosleep_restart(restart);
 112         set_fs(oldfs);
 113
 114         if (ret) {
 115                 rmtp = restart->nanosleep.compat_rmtp;
 116
 117                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 118                         return -EFAULT;
 119         }
 120
 121         return ret;
 122 }
 123
 124 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 125                                      struct compat_timespec __user *rmtp)
 126 {
 127         struct timespec tu, rmt;
 128         mm_segment_t oldfs;
 129         long ret;
 130
 131         if (get_compat_timespec(&tu, rqtp))
 132                 return -EFAULT;
 133
 134         if (!timespec_valid(&tu))
 135                 return -EINVAL;
 136
 137         oldfs = get_fs();
 138         set_fs(KERNEL_DS);
 139         ret = hrtimer_nanosleep(&tu,
 140                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 141                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 142         set_fs(oldfs);
 143
 144         if (ret) {
 145                 struct restart_block *restart
 146                         = &current_thread_info()->restart_block;
 147
 148                 restart->fn = compat_nanosleep_restart;
 149                 restart->nanosleep.compat_rmtp = rmtp;
 150
 151                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 152                         return -EFAULT;
 153         }
 154
 155         return ret;
 156 }
 157
 158 static inline long get_compat_itimerval(struct itimerval *o,
 159                 struct compat_itimerval __user *i)
 160 {
 161         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 162                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 163                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 164                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 165                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 166 }
 167
 168 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 169                 struct itimerval *i)
 170 {
 171         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 172                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 173                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 174                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 175                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 176 }
 177
 178 asmlinkage long compat_sys_getitimer(int which,
 179                 struct compat_itimerval __user *it)
 180 {
 181         struct itimerval kit;
 182         int error;
 183
 184         error = do_getitimer(which, &kit);
 185         if (!error && put_compat_itimerval(it, &kit))
 186                 error = -EFAULT;
 187         return error;
 188 }
 189
 190 asmlinkage long compat_sys_setitimer(int which,
 191                 struct compat_itimerval __user *in,
 192                 struct compat_itimerval __user *out)
 193 {
 194         struct itimerval kin, kout;
 195         int error;
 196
 197         if (in) {
 198                 if (get_compat_itimerval(&kin, in))
 199                         return -EFAULT;
 200         } else
 201                 memset(&kin, 0, sizeof(kin));
 202
 203         error = do_setitimer(which, &kin, out ? &kout : NULL);
 204         if (error || !out)
 205                 return error;
 206         if (put_compat_itimerval(out, &kout))
 207                 return -EFAULT;
 208         return 0;
 209 }
 210
 211 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 212 {
 213         /*
 214          *      In the SMP world we might just be unlucky and have one of
 215          *      the times increment as we use it. Since the value is an
 216          *      atomically safe type this is just fine. Conceptually its
 217          *      as if the syscall took an instant longer to occur.
 218          */
 219         if (tbuf) {
 220                 struct compat_tms tmp;
 221                 struct task_struct *tsk = current;
 222                 struct task_struct *t;
 223                 cputime_t utime, stime, cutime, cstime;
 224
 225                 read_lock(&tasklist_lock);
 226                 utime = tsk->signal->utime;
 227                 stime = tsk->signal->stime;
 228                 t = tsk;
 229                 do {
 230                         utime = cputime_add(utime, t->utime);
 231                         stime = cputime_add(stime, t->stime);
 232                         t = next_thread(t);
 233                 } while (t != tsk);
 234
 235                 /*
 236                  * While we have tasklist_lock read-locked, no dying thread
 237                  * can be updating current->signal->[us]time.  Instead,
 238                  * we got their counts included in the live thread loop.
 239                  * However, another thread can come in right now and
 240                  * do a wait call that updates current->signal->c[us]time.
 241                  * To make sure we always see that pair updated atomically,
 242                  * we take the siglock around fetching them.
 243                  */
 244                 spin_lock_irq(&tsk->sighand->siglock);
 245                 cutime = tsk->signal->cutime;
 246                 cstime = tsk->signal->cstime;
 247                 spin_unlock_irq(&tsk->sighand->siglock);
 248                 read_unlock(&tasklist_lock);
 249
 250                 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
 251                 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
 252                 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
 253                 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
 254                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 255                         return -EFAULT;
 256         }
 257         return compat_jiffies_to_clock_t(jiffies);
 258 }
 259
 260 /*
 261  * Assumption: old_sigset_t and compat_old_sigset_t are both
 262  * types that can be passed to put_user()/get_user().
 263  */
 264
 265 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 266 {
 267         old_sigset_t s;
 268         long ret;
 269         mm_segment_t old_fs = get_fs();
 270
 271         set_fs(KERNEL_DS);
 272         ret = sys_sigpending((old_sigset_t __user *) &s);
 273         set_fs(old_fs);
 274         if (ret == 0)
 275                 ret = put_user(s, set);
 276         return ret;
 277 }
 278
 279 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 280                 compat_old_sigset_t __user *oset)
 281 {
 282         old_sigset_t s;
 283         long ret;
 284         mm_segment_t old_fs;
 285
 286         if (set && get_user(s, set))
 287                 return -EFAULT;
 288         old_fs = get_fs();
 289         set_fs(KERNEL_DS);
 290         ret = sys_sigprocmask(how,
 291                               set ? (old_sigset_t __user *) &s : NULL,
 292                               oset ? (old_sigset_t __user *) &s : NULL);
 293         set_fs(old_fs);
 294         if (ret == 0)
 295                 if (oset)
 296                         ret = put_user(s, oset);
 297         return ret;
 298 }
 299
 300 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 301                 struct compat_rlimit __user *rlim)
 302 {
 303         struct rlimit r;
 304         int ret;
 305         mm_segment_t old_fs = get_fs ();
 306
 307         if (resource >= RLIM_NLIMITS)
 308                 return -EINVAL;
 309
 310         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 311             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 312             __get_user(r.rlim_max, &rlim->rlim_max))
 313                 return -EFAULT;
 314
 315         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 316                 r.rlim_cur = RLIM_INFINITY;
 317         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 318                 r.rlim_max = RLIM_INFINITY;
 319         set_fs(KERNEL_DS);
 320         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 321         set_fs(old_fs);
 322         return ret;
 323 }
 324
 325 #ifdef COMPAT_RLIM_OLD_INFINITY
 326
 327 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 328                 struct compat_rlimit __user *rlim)
 329 {
 330         struct rlimit r;
 331         int ret;
 332         mm_segment_t old_fs = get_fs();
 333
 334         set_fs(KERNEL_DS);
 335         ret = sys_old_getrlimit(resource, &r);
 336         set_fs(old_fs);
 337
 338         if (!ret) {
 339                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 340                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 341                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 342                         r.rlim_max = COMPAT_RLIM_INFINITY;
 343
 344                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 345                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 346                     __put_user(r.rlim_max, &rlim->rlim_max))
 347                         return -EFAULT;
 348         }
 349         return ret;
 350 }
 351
 352 #endif
 353
 354 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 355                 struct compat_rlimit __user *rlim)
 356 {
 357         struct rlimit r;
 358         int ret;
 359         mm_segment_t old_fs = get_fs();
 360
 361         set_fs(KERNEL_DS);
 362         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 363         set_fs(old_fs);
 364         if (!ret) {
 365                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 366                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 367                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 368                         r.rlim_max = COMPAT_RLIM_INFINITY;
 369
 370                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 371                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 372                     __put_user(r.rlim_max, &rlim->rlim_max))
 373                         return -EFAULT;
 374         }
 375         return ret;
 376 }
 377
 378 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 379 {
 380         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 381             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 382             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 383             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 384             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 385             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 386             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 387             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 388             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 389             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 390             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 391             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 392             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 393             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 394             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 395             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 396             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 397             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 398             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 399                 return -EFAULT;
 400         return 0;
 401 }
 402
 403 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 404 {
 405         struct rusage r;
 406         int ret;
 407         mm_segment_t old_fs = get_fs();
 408
 409         set_fs(KERNEL_DS);
 410         ret = sys_getrusage(who, (struct rusage __user *) &r);
 411         set_fs(old_fs);
 412
 413         if (ret)
 414                 return ret;
 415
 416         if (put_compat_rusage(&r, ru))
 417                 return -EFAULT;
 418
 419         return 0;
 420 }
 421
 422 asmlinkage long
 423 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 424         struct compat_rusage __user *ru)
 425 {
 426         if (!ru) {
 427                 return sys_wait4(pid, stat_addr, options, NULL);
 428         } else {
 429                 struct rusage r;
 430                 int ret;
 431                 unsigned int status;
 432                 mm_segment_t old_fs = get_fs();
 433
 434                 set_fs (KERNEL_DS);
 435                 ret = sys_wait4(pid,
 436                                 (stat_addr ?
 437                                  (unsigned int __user *) &status : NULL),
 438                                 options, (struct rusage __user *) &r);
 439                 set_fs (old_fs);
 440
 441                 if (ret > 0) {
 442                         if (put_compat_rusage(&r, ru))
 443                                 return -EFAULT;
 444                         if (stat_addr && put_user(status, stat_addr))
 445                                 return -EFAULT;
 446                 }
 447                 return ret;
 448         }
 449 }
 450
 451 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 452                 struct compat_siginfo __user *uinfo, int options,
 453                 struct compat_rusage __user *uru)
 454 {
 455         siginfo_t info;
 456         struct rusage ru;
 457         long ret;
 458         mm_segment_t old_fs = get_fs();
 459
 460         memset(&info, 0, sizeof(info));
 461
 462         set_fs(KERNEL_DS);
 463         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 464                          uru ? (struct rusage __user *)&ru : NULL);
 465         set_fs(old_fs);
 466
 467         if ((ret < 0) || (info.si_signo == 0))
 468                 return ret;
 469
 470         if (uru) {
 471                 ret = put_compat_rusage(&ru, uru);
 472                 if (ret)
 473                         return ret;
 474         }
 475
 476         BUG_ON(info.si_code & __SI_MASK);
 477         info.si_code |= __SI_CHLD;
 478         return copy_siginfo_to_user32(uinfo, &info);
 479 }
 480
 481 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 482                                     unsigned len, cpumask_t *new_mask)
 483 {
 484         unsigned long *k;
 485
 486         if (len < sizeof(cpumask_t))
 487                 memset(new_mask, 0, sizeof(cpumask_t));
 488         else if (len > sizeof(cpumask_t))
 489                 len = sizeof(cpumask_t);
 490
 491         k = cpus_addr(*new_mask);
 492         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 493 }
 494
 495 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 496                                              unsigned int len,
 497                                              compat_ulong_t __user *user_mask_ptr)
 498 {
 499         cpumask_t new_mask;
 500         int retval;
 501
 502         retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
 503         if (retval)
 504                 return retval;
 505
 506         return sched_setaffinity(pid, &new_mask);
 507 }
 508
 509 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 510                                              compat_ulong_t __user *user_mask_ptr)
 511 {
 512         int ret;
 513         cpumask_t mask;
 514         unsigned long *k;
 515         unsigned int min_length = sizeof(cpumask_t);
 516
 517         if (NR_CPUS <= BITS_PER_COMPAT_LONG)
 518                 min_length = sizeof(compat_ulong_t);
 519
 520         if (len < min_length)
 521                 return -EINVAL;
 522
 523         ret = sched_getaffinity(pid, &mask);
 524         if (ret < 0)
 525                 return ret;
 526
 527         k = cpus_addr(mask);
 528         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 529         if (ret)
 530                 return ret;
 531
 532         return min_length;
 533 }
 534
 535 int get_compat_itimerspec(struct itimerspec *dst,
 536                           const struct compat_itimerspec __user *src)
 537 {
 538         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 539             get_compat_timespec(&dst->it_value, &src->it_value))
 540                 return -EFAULT;
 541         return 0;
 542 }
 543
 544 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 545                           const struct itimerspec *src)
 546 {
 547         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 548             put_compat_timespec(&src->it_value, &dst->it_value))
 549                 return -EFAULT;
 550         return 0;
 551 }
 552
 553 long compat_sys_timer_create(clockid_t which_clock,
 554                         struct compat_sigevent __user *timer_event_spec,
 555                         timer_t __user *created_timer_id)
 556 {
 557         struct sigevent __user *event = NULL;
 558
 559         if (timer_event_spec) {
 560                 struct sigevent kevent;
 561
 562                 event = compat_alloc_user_space(sizeof(*event));
 563                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 564                     copy_to_user(event, &kevent, sizeof(*event)))
 565                         return -EFAULT;
 566         }
 567
 568         return sys_timer_create(which_clock, event, created_timer_id);
 569 }
 570
 571 long compat_sys_timer_settime(timer_t timer_id, int flags,
 572                           struct compat_itimerspec __user *new,
 573                           struct compat_itimerspec __user *old)
 574 {
 575         long err;
 576         mm_segment_t oldfs;
 577         struct itimerspec newts, oldts;
 578
 579         if (!new)
 580                 return -EINVAL;
 581         if (get_compat_itimerspec(&newts, new))
 582                 return -EFAULT;
 583         oldfs = get_fs();
 584         set_fs(KERNEL_DS);
 585         err = sys_timer_settime(timer_id, flags,
 586                                 (struct itimerspec __user *) &newts,
 587                                 (struct itimerspec __user *) &oldts);
 588         set_fs(oldfs);
 589         if (!err && old && put_compat_itimerspec(old, &oldts))
 590                 return -EFAULT;
 591         return err;
 592 }
 593
 594 long compat_sys_timer_gettime(timer_t timer_id,
 595                 struct compat_itimerspec __user *setting)
 596 {
 597         long err;
 598         mm_segment_t oldfs;
 599         struct itimerspec ts;
 600
 601         oldfs = get_fs();
 602         set_fs(KERNEL_DS);
 603         err = sys_timer_gettime(timer_id,
 604                                 (struct itimerspec __user *) &ts);
 605         set_fs(oldfs);
 606         if (!err && put_compat_itimerspec(setting, &ts))
 607                 return -EFAULT;
 608         return err;
 609 }
 610
 611 long compat_sys_clock_settime(clockid_t which_clock,
 612                 struct compat_timespec __user *tp)
 613 {
 614         long err;
 615         mm_segment_t oldfs;
 616         struct timespec ts;
 617
 618         if (get_compat_timespec(&ts, tp))
 619                 return -EFAULT;
 620         oldfs = get_fs();
 621         set_fs(KERNEL_DS);
 622         err = sys_clock_settime(which_clock,
 623                                 (struct timespec __user *) &ts);
 624         set_fs(oldfs);
 625         return err;
 626 }
 627
 628 long compat_sys_clock_gettime(clockid_t which_clock,
 629                 struct compat_timespec __user *tp)
 630 {
 631         long err;
 632         mm_segment_t oldfs;
 633         struct timespec ts;
 634
 635         oldfs = get_fs();
 636         set_fs(KERNEL_DS);
 637         err = sys_clock_gettime(which_clock,
 638                                 (struct timespec __user *) &ts);
 639         set_fs(oldfs);
 640         if (!err && put_compat_timespec(&ts, tp))
 641                 return -EFAULT;
 642         return err;
 643 }
 644
 645 long compat_sys_clock_getres(clockid_t which_clock,
 646                 struct compat_timespec __user *tp)
 647 {
 648         long err;
 649         mm_segment_t oldfs;
 650         struct timespec ts;
 651
 652         oldfs = get_fs();
 653         set_fs(KERNEL_DS);
 654         err = sys_clock_getres(which_clock,
 655                                (struct timespec __user *) &ts);
 656         set_fs(oldfs);
 657         if (!err && tp && put_compat_timespec(&ts, tp))
 658                 return -EFAULT;
 659         return err;
 660 }
 661
 662 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 663 {
 664         long err;
 665         mm_segment_t oldfs;
 666         struct timespec tu;
 667         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 668
 669         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 670         oldfs = get_fs();
 671         set_fs(KERNEL_DS);
 672         err = clock_nanosleep_restart(restart);
 673         set_fs(oldfs);
 674
 675         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 676             put_compat_timespec(&tu, rmtp))
 677                 return -EFAULT;
 678
 679         if (err == -ERESTART_RESTARTBLOCK) {
 680                 restart->fn = compat_clock_nanosleep_restart;
 681                 restart->nanosleep.compat_rmtp = rmtp;
 682         }
 683         return err;
 684 }
 685
 686 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 687                             struct compat_timespec __user *rqtp,
 688                             struct compat_timespec __user *rmtp)
 689 {
 690         long err;
 691         mm_segment_t oldfs;
 692         struct timespec in, out;
 693         struct restart_block *restart;
 694
 695         if (get_compat_timespec(&in, rqtp))
 696                 return -EFAULT;
 697
 698         oldfs = get_fs();
 699         set_fs(KERNEL_DS);
 700         err = sys_clock_nanosleep(which_clock, flags,
 701                                   (struct timespec __user *) &in,
 702                                   (struct timespec __user *) &out);
 703         set_fs(oldfs);
 704
 705         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 706             put_compat_timespec(&out, rmtp))
 707                 return -EFAULT;
 708
 709         if (err == -ERESTART_RESTARTBLOCK) {
 710                 restart = &current_thread_info()->restart_block;
 711                 restart->fn = compat_clock_nanosleep_restart;
 712                 restart->nanosleep.compat_rmtp = rmtp;
 713         }
 714         return err;
 715 }
 716
 717 /*
 718  * We currently only need the following fields from the sigevent
 719  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 720  * sigev_notify_thread_id).  The others are handled in user mode.
 721  * We also assume that copying sigev_value.sival_int is sufficient
 722  * to keep all the bits of sigev_value.sival_ptr intact.
 723  */
 724 int get_compat_sigevent(struct sigevent *event,
 725                 const struct compat_sigevent __user *u_event)
 726 {
 727         memset(event, 0, sizeof(*event));
 728         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 729                 __get_user(event->sigev_value.sival_int,
 730                         &u_event->sigev_value.sival_int) ||
 731                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 732                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 733                 __get_user(event->sigev_notify_thread_id,
 734                         &u_event->sigev_notify_thread_id))
 735                 ? -EFAULT : 0;
 736 }
 737
 738 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 739                        unsigned long bitmap_size)
 740 {
 741         int i, j;
 742         unsigned long m;
 743         compat_ulong_t um;
 744         unsigned long nr_compat_longs;
 745
 746         /* align bitmap up to nearest compat_long_t boundary */
 747         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 748
 749         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 750                 return -EFAULT;
 751
 752         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 753
 754         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 755                 m = 0;
 756
 757                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 758                         /*
 759                          * We dont want to read past the end of the userspace
 760                          * bitmap. We must however ensure the end of the
 761                          * kernel bitmap is zeroed.
 762                          */
 763                         if (nr_compat_longs-- > 0) {
 764                                 if (__get_user(um, umask))
 765                                         return -EFAULT;
 766                         } else {
 767                                 um = 0;
 768                         }
 769
 770                         umask++;
 771                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 772                 }
 773                 *mask++ = m;
 774         }
 775
 776         return 0;
 777 }
 778
 779 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 780                        unsigned long bitmap_size)
 781 {
 782         int i, j;
 783         unsigned long m;
 784         compat_ulong_t um;
 785         unsigned long nr_compat_longs;
 786
 787         /* align bitmap up to nearest compat_long_t boundary */
 788         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 789
 790         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 791                 return -EFAULT;
 792
 793         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 794
 795         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 796                 m = *mask++;
 797
 798                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 799                         um = m;
 800
 801                         /*
 802                          * We dont want to write past the end of the userspace
 803                          * bitmap.
 804                          */
 805                         if (nr_compat_longs-- > 0) {
 806                                 if (__put_user(um, umask))
 807                                         return -EFAULT;
 808                         }
 809
 810                         umask++;
 811                         m >>= 4*sizeof(um);
 812                         m >>= 4*sizeof(um);
 813                 }
 814         }
 815
 816         return 0;
 817 }
 818
 819 void
 820 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 821 {
 822         switch (_NSIG_WORDS) {
 823         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 824         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 825         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 826         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 827         }
 828 }
 829
 830 asmlinkage long
 831 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 832                 struct compat_siginfo __user *uinfo,
 833                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 834 {
 835         compat_sigset_t s32;
 836         sigset_t s;
 837         int sig;
 838         struct timespec t;
 839         siginfo_t info;
 840         long ret, timeout = 0;
 841
 842         if (sigsetsize != sizeof(sigset_t))
 843                 return -EINVAL;
 844
 845         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 846                 return -EFAULT;
 847         sigset_from_compat(&s, &s32);
 848         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 849         signotset(&s);
 850
 851         if (uts) {
 852                 if (get_compat_timespec (&t, uts))
 853                         return -EFAULT;
 854                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 855                                 || t.tv_sec < 0)
 856                         return -EINVAL;
 857         }
 858
 859         spin_lock_irq(&current->sighand->siglock);
 860         sig = dequeue_signal(current, &s, &info);
 861         if (!sig) {
 862                 timeout = MAX_SCHEDULE_TIMEOUT;
 863                 if (uts)
 864                         timeout = timespec_to_jiffies(&t)
 865                                 +(t.tv_sec || t.tv_nsec);
 866                 if (timeout) {
 867                         current->real_blocked = current->blocked;
 868                         sigandsets(&current->blocked, &current->blocked, &s);
 869
 870                         recalc_sigpending();
 871                         spin_unlock_irq(&current->sighand->siglock);
 872
 873                         timeout = schedule_timeout_interruptible(timeout);
 874
 875                         spin_lock_irq(&current->sighand->siglock);
 876                         sig = dequeue_signal(current, &s, &info);
 877                         current->blocked = current->real_blocked;
 878                         siginitset(&current->real_blocked, 0);
 879                         recalc_sigpending();
 880                 }
 881         }
 882         spin_unlock_irq(&current->sighand->siglock);
 883
 884         if (sig) {
 885                 ret = sig;
 886                 if (uinfo) {
 887                         if (copy_siginfo_to_user32(uinfo, &info))
 888                                 ret = -EFAULT;
 889                 }
 890         }else {
 891                 ret = timeout?-EINTR:-EAGAIN;
 892         }
 893         return ret;
 894
 895 }
 896
 897 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 898
 899 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 900
 901 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 902 {
 903         compat_time_t i;
 904         struct timeval tv;
 905
 906         do_gettimeofday(&tv);
 907         i = tv.tv_sec;
 908
 909         if (tloc) {
 910                 if (put_user(i,tloc))
 911                         i = -EFAULT;
 912         }
 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 }