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 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  30 {
  31         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  32                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  33                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  34 }
  35
  36 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  37 {
  38         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  39                         __put_user(ts->tv_sec, &cts->tv_sec) ||
  40                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  41 }
  42
  43 static long compat_nanosleep_restart(struct restart_block *restart)
  44 {
  45         struct compat_timespec __user *rmtp;
  46         struct timespec rmt;
  47         mm_segment_t oldfs;
  48         long ret;
  49
  50         rmtp = (struct compat_timespec __user *)(restart->arg1);
  51         restart->arg1 = (unsigned long)&rmt;
  52         oldfs = get_fs();
  53         set_fs(KERNEL_DS);
  54         ret = hrtimer_nanosleep_restart(restart);
  55         set_fs(oldfs);
  56
  57         if (ret) {
  58                 restart->arg1 = (unsigned long)rmtp;
  59
  60                 if (rmtp && put_compat_timespec(&rmt, rmtp))
  61                         return -EFAULT;
  62         }
  63
  64         return ret;
  65 }
  66
  67 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
  68                                      struct compat_timespec __user *rmtp)
  69 {
  70         struct timespec tu, rmt;
  71         mm_segment_t oldfs;
  72         long ret;
  73
  74         if (get_compat_timespec(&tu, rqtp))
  75                 return -EFAULT;
  76
  77         if (!timespec_valid(&tu))
  78                 return -EINVAL;
  79
  80         oldfs = get_fs();
  81         set_fs(KERNEL_DS);
  82         ret = hrtimer_nanosleep(&tu,
  83                                 rmtp ? (struct timespec __user *)&rmt : NULL,
  84                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
  85         set_fs(oldfs);
  86
  87         if (ret) {
  88                 struct restart_block *restart
  89                         = &current_thread_info()->restart_block;
  90
  91                 restart->fn = compat_nanosleep_restart;
  92                 restart->arg1 = (unsigned long)rmtp;
  93
  94                 if (rmtp && put_compat_timespec(&rmt, rmtp))
  95                         return -EFAULT;
  96         }
  97
  98         return ret;
  99 }
 100
 101 static inline long get_compat_itimerval(struct itimerval *o,
 102                 struct compat_itimerval __user *i)
 103 {
 104         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 105                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 106                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 107                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 108                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 109 }
 110
 111 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 112                 struct itimerval *i)
 113 {
 114         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 115                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 116                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 117                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 118                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 119 }
 120
 121 asmlinkage long compat_sys_getitimer(int which,
 122                 struct compat_itimerval __user *it)
 123 {
 124         struct itimerval kit;
 125         int error;
 126
 127         error = do_getitimer(which, &kit);
 128         if (!error && put_compat_itimerval(it, &kit))
 129                 error = -EFAULT;
 130         return error;
 131 }
 132
 133 asmlinkage long compat_sys_setitimer(int which,
 134                 struct compat_itimerval __user *in,
 135                 struct compat_itimerval __user *out)
 136 {
 137         struct itimerval kin, kout;
 138         int error;
 139
 140         if (in) {
 141                 if (get_compat_itimerval(&kin, in))
 142                         return -EFAULT;
 143         } else
 144                 memset(&kin, 0, sizeof(kin));
 145
 146         error = do_setitimer(which, &kin, out ? &kout : NULL);
 147         if (error || !out)
 148                 return error;
 149         if (put_compat_itimerval(out, &kout))
 150                 return -EFAULT;
 151         return 0;
 152 }
 153
 154 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 155 {
 156         /*
 157          *      In the SMP world we might just be unlucky and have one of
 158          *      the times increment as we use it. Since the value is an
 159          *      atomically safe type this is just fine. Conceptually its
 160          *      as if the syscall took an instant longer to occur.
 161          */
 162         if (tbuf) {
 163                 struct compat_tms tmp;
 164                 struct task_struct *tsk = current;
 165                 struct task_struct *t;
 166                 cputime_t utime, stime, cutime, cstime;
 167
 168                 read_lock(&tasklist_lock);
 169                 utime = tsk->signal->utime;
 170                 stime = tsk->signal->stime;
 171                 t = tsk;
 172                 do {
 173                         utime = cputime_add(utime, t->utime);
 174                         stime = cputime_add(stime, t->stime);
 175                         t = next_thread(t);
 176                 } while (t != tsk);
 177
 178                 /*
 179                  * While we have tasklist_lock read-locked, no dying thread
 180                  * can be updating current->signal->[us]time.  Instead,
 181                  * we got their counts included in the live thread loop.
 182                  * However, another thread can come in right now and
 183                  * do a wait call that updates current->signal->c[us]time.
 184                  * To make sure we always see that pair updated atomically,
 185                  * we take the siglock around fetching them.
 186                  */
 187                 spin_lock_irq(&tsk->sighand->siglock);
 188                 cutime = tsk->signal->cutime;
 189                 cstime = tsk->signal->cstime;
 190                 spin_unlock_irq(&tsk->sighand->siglock);
 191                 read_unlock(&tasklist_lock);
 192
 193                 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
 194                 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
 195                 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
 196                 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
 197                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 198                         return -EFAULT;
 199         }
 200         return compat_jiffies_to_clock_t(jiffies);
 201 }
 202
 203 /*
 204  * Assumption: old_sigset_t and compat_old_sigset_t are both
 205  * types that can be passed to put_user()/get_user().
 206  */
 207
 208 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 209 {
 210         old_sigset_t s;
 211         long ret;
 212         mm_segment_t old_fs = get_fs();
 213
 214         set_fs(KERNEL_DS);
 215         ret = sys_sigpending((old_sigset_t __user *) &s);
 216         set_fs(old_fs);
 217         if (ret == 0)
 218                 ret = put_user(s, set);
 219         return ret;
 220 }
 221
 222 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 223                 compat_old_sigset_t __user *oset)
 224 {
 225         old_sigset_t s;
 226         long ret;
 227         mm_segment_t old_fs;
 228
 229         if (set && get_user(s, set))
 230                 return -EFAULT;
 231         old_fs = get_fs();
 232         set_fs(KERNEL_DS);
 233         ret = sys_sigprocmask(how,
 234                               set ? (old_sigset_t __user *) &s : NULL,
 235                               oset ? (old_sigset_t __user *) &s : NULL);
 236         set_fs(old_fs);
 237         if (ret == 0)
 238                 if (oset)
 239                         ret = put_user(s, oset);
 240         return ret;
 241 }
 242
 243 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 244                 struct compat_rlimit __user *rlim)
 245 {
 246         struct rlimit r;
 247         int ret;
 248         mm_segment_t old_fs = get_fs ();
 249
 250         if (resource >= RLIM_NLIMITS)
 251                 return -EINVAL;
 252
 253         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 254             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 255             __get_user(r.rlim_max, &rlim->rlim_max))
 256                 return -EFAULT;
 257
 258         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 259                 r.rlim_cur = RLIM_INFINITY;
 260         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 261                 r.rlim_max = RLIM_INFINITY;
 262         set_fs(KERNEL_DS);
 263         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 264         set_fs(old_fs);
 265         return ret;
 266 }
 267
 268 #ifdef COMPAT_RLIM_OLD_INFINITY
 269
 270 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 271                 struct compat_rlimit __user *rlim)
 272 {
 273         struct rlimit r;
 274         int ret;
 275         mm_segment_t old_fs = get_fs();
 276
 277         set_fs(KERNEL_DS);
 278         ret = sys_old_getrlimit(resource, &r);
 279         set_fs(old_fs);
 280
 281         if (!ret) {
 282                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 283                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 284                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 285                         r.rlim_max = COMPAT_RLIM_INFINITY;
 286
 287                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 288                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 289                     __put_user(r.rlim_max, &rlim->rlim_max))
 290                         return -EFAULT;
 291         }
 292         return ret;
 293 }
 294
 295 #endif
 296
 297 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 298                 struct compat_rlimit __user *rlim)
 299 {
 300         struct rlimit r;
 301         int ret;
 302         mm_segment_t old_fs = get_fs();
 303
 304         set_fs(KERNEL_DS);
 305         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 306         set_fs(old_fs);
 307         if (!ret) {
 308                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 309                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 310                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 311                         r.rlim_max = COMPAT_RLIM_INFINITY;
 312
 313                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 314                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 315                     __put_user(r.rlim_max, &rlim->rlim_max))
 316                         return -EFAULT;
 317         }
 318         return ret;
 319 }
 320
 321 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 322 {
 323         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 324             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 325             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 326             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 327             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 328             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 329             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 330             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 331             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 332             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 333             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 334             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 335             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 336             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 337             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 338             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 339             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 340             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 341             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 342                 return -EFAULT;
 343         return 0;
 344 }
 345
 346 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 347 {
 348         struct rusage r;
 349         int ret;
 350         mm_segment_t old_fs = get_fs();
 351
 352         set_fs(KERNEL_DS);
 353         ret = sys_getrusage(who, (struct rusage __user *) &r);
 354         set_fs(old_fs);
 355
 356         if (ret)
 357                 return ret;
 358
 359         if (put_compat_rusage(&r, ru))
 360                 return -EFAULT;
 361
 362         return 0;
 363 }
 364
 365 asmlinkage long
 366 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 367         struct compat_rusage __user *ru)
 368 {
 369         if (!ru) {
 370                 return sys_wait4(pid, stat_addr, options, NULL);
 371         } else {
 372                 struct rusage r;
 373                 int ret;
 374                 unsigned int status;
 375                 mm_segment_t old_fs = get_fs();
 376
 377                 set_fs (KERNEL_DS);
 378                 ret = sys_wait4(pid,
 379                                 (stat_addr ?
 380                                  (unsigned int __user *) &status : NULL),
 381                                 options, (struct rusage __user *) &r);
 382                 set_fs (old_fs);
 383
 384                 if (ret > 0) {
 385                         if (put_compat_rusage(&r, ru))
 386                                 return -EFAULT;
 387                         if (stat_addr && put_user(status, stat_addr))
 388                                 return -EFAULT;
 389                 }
 390                 return ret;
 391         }
 392 }
 393
 394 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 395                 struct compat_siginfo __user *uinfo, int options,
 396                 struct compat_rusage __user *uru)
 397 {
 398         siginfo_t info;
 399         struct rusage ru;
 400         long ret;
 401         mm_segment_t old_fs = get_fs();
 402
 403         memset(&info, 0, sizeof(info));
 404
 405         set_fs(KERNEL_DS);
 406         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 407                          uru ? (struct rusage __user *)&ru : NULL);
 408         set_fs(old_fs);
 409
 410         if ((ret < 0) || (info.si_signo == 0))
 411                 return ret;
 412
 413         if (uru) {
 414                 ret = put_compat_rusage(&ru, uru);
 415                 if (ret)
 416                         return ret;
 417         }
 418
 419         BUG_ON(info.si_code & __SI_MASK);
 420         info.si_code |= __SI_CHLD;
 421         return copy_siginfo_to_user32(uinfo, &info);
 422 }
 423
 424 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 425                                     unsigned len, cpumask_t *new_mask)
 426 {
 427         unsigned long *k;
 428
 429         if (len < sizeof(cpumask_t))
 430                 memset(new_mask, 0, sizeof(cpumask_t));
 431         else if (len > sizeof(cpumask_t))
 432                 len = sizeof(cpumask_t);
 433
 434         k = cpus_addr(*new_mask);
 435         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 436 }
 437
 438 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 439                                              unsigned int len,
 440                                              compat_ulong_t __user *user_mask_ptr)
 441 {
 442         cpumask_t new_mask;
 443         int retval;
 444
 445         retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
 446         if (retval)
 447                 return retval;
 448
 449         return sched_setaffinity(pid, new_mask);
 450 }
 451
 452 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 453                                              compat_ulong_t __user *user_mask_ptr)
 454 {
 455         int ret;
 456         cpumask_t mask;
 457         unsigned long *k;
 458         unsigned int min_length = sizeof(cpumask_t);
 459
 460         if (NR_CPUS <= BITS_PER_COMPAT_LONG)
 461                 min_length = sizeof(compat_ulong_t);
 462
 463         if (len < min_length)
 464                 return -EINVAL;
 465
 466         ret = sched_getaffinity(pid, &mask);
 467         if (ret < 0)
 468                 return ret;
 469
 470         k = cpus_addr(mask);
 471         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 472         if (ret)
 473                 return ret;
 474
 475         return min_length;
 476 }
 477
 478 int get_compat_itimerspec(struct itimerspec *dst,
 479                           const struct compat_itimerspec __user *src)
 480 {
 481         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 482             get_compat_timespec(&dst->it_value, &src->it_value))
 483                 return -EFAULT;
 484         return 0;
 485 }
 486
 487 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 488                           const struct itimerspec *src)
 489 {
 490         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 491             put_compat_timespec(&src->it_value, &dst->it_value))
 492                 return -EFAULT;
 493         return 0;
 494 }
 495
 496 long compat_sys_timer_create(clockid_t which_clock,
 497                         struct compat_sigevent __user *timer_event_spec,
 498                         timer_t __user *created_timer_id)
 499 {
 500         struct sigevent __user *event = NULL;
 501
 502         if (timer_event_spec) {
 503                 struct sigevent kevent;
 504
 505                 event = compat_alloc_user_space(sizeof(*event));
 506                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 507                     copy_to_user(event, &kevent, sizeof(*event)))
 508                         return -EFAULT;
 509         }
 510
 511         return sys_timer_create(which_clock, event, created_timer_id);
 512 }
 513
 514 long compat_sys_timer_settime(timer_t timer_id, int flags,
 515                           struct compat_itimerspec __user *new,
 516                           struct compat_itimerspec __user *old)
 517 {
 518         long err;
 519         mm_segment_t oldfs;
 520         struct itimerspec newts, oldts;
 521
 522         if (!new)
 523                 return -EINVAL;
 524         if (get_compat_itimerspec(&newts, new))
 525                 return -EFAULT;
 526         oldfs = get_fs();
 527         set_fs(KERNEL_DS);
 528         err = sys_timer_settime(timer_id, flags,
 529                                 (struct itimerspec __user *) &newts,
 530                                 (struct itimerspec __user *) &oldts);
 531         set_fs(oldfs);
 532         if (!err && old && put_compat_itimerspec(old, &oldts))
 533                 return -EFAULT;
 534         return err;
 535 }
 536
 537 long compat_sys_timer_gettime(timer_t timer_id,
 538                 struct compat_itimerspec __user *setting)
 539 {
 540         long err;
 541         mm_segment_t oldfs;
 542         struct itimerspec ts;
 543
 544         oldfs = get_fs();
 545         set_fs(KERNEL_DS);
 546         err = sys_timer_gettime(timer_id,
 547                                 (struct itimerspec __user *) &ts);
 548         set_fs(oldfs);
 549         if (!err && put_compat_itimerspec(setting, &ts))
 550                 return -EFAULT;
 551         return err;
 552 }
 553
 554 long compat_sys_clock_settime(clockid_t which_clock,
 555                 struct compat_timespec __user *tp)
 556 {
 557         long err;
 558         mm_segment_t oldfs;
 559         struct timespec ts;
 560
 561         if (get_compat_timespec(&ts, tp))
 562                 return -EFAULT;
 563         oldfs = get_fs();
 564         set_fs(KERNEL_DS);
 565         err = sys_clock_settime(which_clock,
 566                                 (struct timespec __user *) &ts);
 567         set_fs(oldfs);
 568         return err;
 569 }
 570
 571 long compat_sys_clock_gettime(clockid_t which_clock,
 572                 struct compat_timespec __user *tp)
 573 {
 574         long err;
 575         mm_segment_t oldfs;
 576         struct timespec ts;
 577
 578         oldfs = get_fs();
 579         set_fs(KERNEL_DS);
 580         err = sys_clock_gettime(which_clock,
 581                                 (struct timespec __user *) &ts);
 582         set_fs(oldfs);
 583         if (!err && put_compat_timespec(&ts, tp))
 584                 return -EFAULT;
 585         return err;
 586 }
 587
 588 long compat_sys_clock_getres(clockid_t which_clock,
 589                 struct compat_timespec __user *tp)
 590 {
 591         long err;
 592         mm_segment_t oldfs;
 593         struct timespec ts;
 594
 595         oldfs = get_fs();
 596         set_fs(KERNEL_DS);
 597         err = sys_clock_getres(which_clock,
 598                                (struct timespec __user *) &ts);
 599         set_fs(oldfs);
 600         if (!err && tp && put_compat_timespec(&ts, tp))
 601                 return -EFAULT;
 602         return err;
 603 }
 604
 605 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 606 {
 607         long err;
 608         mm_segment_t oldfs;
 609         struct timespec tu;
 610         struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
 611
 612         restart->arg1 = (unsigned long) &tu;
 613         oldfs = get_fs();
 614         set_fs(KERNEL_DS);
 615         err = clock_nanosleep_restart(restart);
 616         set_fs(oldfs);
 617
 618         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 619             put_compat_timespec(&tu, rmtp))
 620                 return -EFAULT;
 621
 622         if (err == -ERESTART_RESTARTBLOCK) {
 623                 restart->fn = compat_clock_nanosleep_restart;
 624                 restart->arg1 = (unsigned long) rmtp;
 625         }
 626         return err;
 627 }
 628
 629 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 630                             struct compat_timespec __user *rqtp,
 631                             struct compat_timespec __user *rmtp)
 632 {
 633         long err;
 634         mm_segment_t oldfs;
 635         struct timespec in, out;
 636         struct restart_block *restart;
 637
 638         if (get_compat_timespec(&in, rqtp))
 639                 return -EFAULT;
 640
 641         oldfs = get_fs();
 642         set_fs(KERNEL_DS);
 643         err = sys_clock_nanosleep(which_clock, flags,
 644                                   (struct timespec __user *) &in,
 645                                   (struct timespec __user *) &out);
 646         set_fs(oldfs);
 647
 648         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 649             put_compat_timespec(&out, rmtp))
 650                 return -EFAULT;
 651
 652         if (err == -ERESTART_RESTARTBLOCK) {
 653                 restart = &current_thread_info()->restart_block;
 654                 restart->fn = compat_clock_nanosleep_restart;
 655                 restart->arg1 = (unsigned long) rmtp;
 656         }
 657         return err;
 658 }
 659
 660 /*
 661  * We currently only need the following fields from the sigevent
 662  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 663  * sigev_notify_thread_id).  The others are handled in user mode.
 664  * We also assume that copying sigev_value.sival_int is sufficient
 665  * to keep all the bits of sigev_value.sival_ptr intact.
 666  */
 667 int get_compat_sigevent(struct sigevent *event,
 668                 const struct compat_sigevent __user *u_event)
 669 {
 670         memset(event, 0, sizeof(*event));
 671         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 672                 __get_user(event->sigev_value.sival_int,
 673                         &u_event->sigev_value.sival_int) ||
 674                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 675                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 676                 __get_user(event->sigev_notify_thread_id,
 677                         &u_event->sigev_notify_thread_id))
 678                 ? -EFAULT : 0;
 679 }
 680
 681 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 682                        unsigned long bitmap_size)
 683 {
 684         int i, j;
 685         unsigned long m;
 686         compat_ulong_t um;
 687         unsigned long nr_compat_longs;
 688
 689         /* align bitmap up to nearest compat_long_t boundary */
 690         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 691
 692         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 693                 return -EFAULT;
 694
 695         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 696
 697         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 698                 m = 0;
 699
 700                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 701                         /*
 702                          * We dont want to read past the end of the userspace
 703                          * bitmap. We must however ensure the end of the
 704                          * kernel bitmap is zeroed.
 705                          */
 706                         if (nr_compat_longs-- > 0) {
 707                                 if (__get_user(um, umask))
 708                                         return -EFAULT;
 709                         } else {
 710                                 um = 0;
 711                         }
 712
 713                         umask++;
 714                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 715                 }
 716                 *mask++ = m;
 717         }
 718
 719         return 0;
 720 }
 721
 722 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 723                        unsigned long bitmap_size)
 724 {
 725         int i, j;
 726         unsigned long m;
 727         compat_ulong_t um;
 728         unsigned long nr_compat_longs;
 729
 730         /* align bitmap up to nearest compat_long_t boundary */
 731         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 732
 733         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 734                 return -EFAULT;
 735
 736         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 737
 738         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 739                 m = *mask++;
 740
 741                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 742                         um = m;
 743
 744                         /*
 745                          * We dont want to write past the end of the userspace
 746                          * bitmap.
 747                          */
 748                         if (nr_compat_longs-- > 0) {
 749                                 if (__put_user(um, umask))
 750                                         return -EFAULT;
 751                         }
 752
 753                         umask++;
 754                         m >>= 4*sizeof(um);
 755                         m >>= 4*sizeof(um);
 756                 }
 757         }
 758
 759         return 0;
 760 }
 761
 762 void
 763 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 764 {
 765         switch (_NSIG_WORDS) {
 766         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 767         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 768         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 769         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 770         }
 771 }
 772
 773 asmlinkage long
 774 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 775                 struct compat_siginfo __user *uinfo,
 776                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 777 {
 778         compat_sigset_t s32;
 779         sigset_t s;
 780         int sig;
 781         struct timespec t;
 782         siginfo_t info;
 783         long ret, timeout = 0;
 784
 785         if (sigsetsize != sizeof(sigset_t))
 786                 return -EINVAL;
 787
 788         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 789                 return -EFAULT;
 790         sigset_from_compat(&s, &s32);
 791         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 792         signotset(&s);
 793
 794         if (uts) {
 795                 if (get_compat_timespec (&t, uts))
 796                         return -EFAULT;
 797                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 798                                 || t.tv_sec < 0)
 799                         return -EINVAL;
 800         }
 801
 802         spin_lock_irq(&current->sighand->siglock);
 803         sig = dequeue_signal(current, &s, &info);
 804         if (!sig) {
 805                 timeout = MAX_SCHEDULE_TIMEOUT;
 806                 if (uts)
 807                         timeout = timespec_to_jiffies(&t)
 808                                 +(t.tv_sec || t.tv_nsec);
 809                 if (timeout) {
 810                         current->real_blocked = current->blocked;
 811                         sigandsets(&current->blocked, &current->blocked, &s);
 812
 813                         recalc_sigpending();
 814                         spin_unlock_irq(&current->sighand->siglock);
 815
 816                         timeout = schedule_timeout_interruptible(timeout);
 817
 818                         spin_lock_irq(&current->sighand->siglock);
 819                         sig = dequeue_signal(current, &s, &info);
 820                         current->blocked = current->real_blocked;
 821                         siginitset(&current->real_blocked, 0);
 822                         recalc_sigpending();
 823                 }
 824         }
 825         spin_unlock_irq(&current->sighand->siglock);
 826
 827         if (sig) {
 828                 ret = sig;
 829                 if (uinfo) {
 830                         if (copy_siginfo_to_user32(uinfo, &info))
 831                                 ret = -EFAULT;
 832                 }
 833         }else {
 834                 ret = timeout?-EINTR:-EAGAIN;
 835         }
 836         return ret;
 837
 838 }
 839
 840 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 841
 842 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 843
 844 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 845 {
 846         compat_time_t i;
 847         struct timeval tv;
 848
 849         do_gettimeofday(&tv);
 850         i = tv.tv_sec;
 851
 852         if (tloc) {
 853                 if (put_user(i,tloc))
 854                         i = -EFAULT;
 855         }
 856         return i;
 857 }
 858
 859 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 860 {
 861         struct timespec tv;
 862         int err;
 863
 864         if (get_user(tv.tv_sec, tptr))
 865                 return -EFAULT;
 866
 867         tv.tv_nsec = 0;
 868
 869         err = security_settime(&tv, NULL);
 870         if (err)
 871                 return err;
 872
 873         do_settimeofday(&tv);
 874         return 0;
 875 }
 876
 877 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 878
 879 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 880 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 881 {
 882         sigset_t newset;
 883         compat_sigset_t newset32;
 884
 885         /* XXX: Don't preclude handling different sized sigset_t's.  */
 886         if (sigsetsize != sizeof(sigset_t))
 887                 return -EINVAL;
 888
 889         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 890                 return -EFAULT;
 891         sigset_from_compat(&newset, &newset32);
 892         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 893
 894         spin_lock_irq(&current->sighand->siglock);
 895         current->saved_sigmask = current->blocked;
 896         current->blocked = newset;
 897         recalc_sigpending();
 898         spin_unlock_irq(&current->sighand->siglock);
 899
 900         current->state = TASK_INTERRUPTIBLE;
 901         schedule();
 902         set_thread_flag(TIF_RESTORE_SIGMASK);
 903         return -ERESTARTNOHAND;
 904 }
 905 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 906
 907 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 908 {
 909         struct timex txc;
 910         int ret;
 911
 912         memset(&txc, 0, sizeof(struct timex));
 913
 914         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 915                         __get_user(txc.modes, &utp->modes) ||
 916                         __get_user(txc.offset, &utp->offset) ||
 917                         __get_user(txc.freq, &utp->freq) ||
 918                         __get_user(txc.maxerror, &utp->maxerror) ||
 919                         __get_user(txc.esterror, &utp->esterror) ||
 920                         __get_user(txc.status, &utp->status) ||
 921                         __get_user(txc.constant, &utp->constant) ||
 922                         __get_user(txc.precision, &utp->precision) ||
 923                         __get_user(txc.tolerance, &utp->tolerance) ||
 924                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 925                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 926                         __get_user(txc.tick, &utp->tick) ||
 927                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 928                         __get_user(txc.jitter, &utp->jitter) ||
 929                         __get_user(txc.shift, &utp->shift) ||
 930                         __get_user(txc.stabil, &utp->stabil) ||
 931                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 932                         __get_user(txc.calcnt, &utp->calcnt) ||
 933                         __get_user(txc.errcnt, &utp->errcnt) ||
 934                         __get_user(txc.stbcnt, &utp->stbcnt))
 935                 return -EFAULT;
 936
 937         ret = do_adjtimex(&txc);
 938
 939         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 940                         __put_user(txc.modes, &utp->modes) ||
 941                         __put_user(txc.offset, &utp->offset) ||
 942                         __put_user(txc.freq, &utp->freq) ||
 943                         __put_user(txc.maxerror, &utp->maxerror) ||
 944                         __put_user(txc.esterror, &utp->esterror) ||
 945                         __put_user(txc.status, &utp->status) ||
 946                         __put_user(txc.constant, &utp->constant) ||
 947                         __put_user(txc.precision, &utp->precision) ||
 948                         __put_user(txc.tolerance, &utp->tolerance) ||
 949                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 950                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 951                         __put_user(txc.tick, &utp->tick) ||
 952                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
 953                         __put_user(txc.jitter, &utp->jitter) ||
 954                         __put_user(txc.shift, &utp->shift) ||
 955                         __put_user(txc.stabil, &utp->stabil) ||
 956                         __put_user(txc.jitcnt, &utp->jitcnt) ||
 957                         __put_user(txc.calcnt, &utp->calcnt) ||
 958                         __put_user(txc.errcnt, &utp->errcnt) ||
 959                         __put_user(txc.stbcnt, &utp->stbcnt))
 960                 ret = -EFAULT;
 961
 962         return ret;
 963 }
 964
 965 #ifdef CONFIG_NUMA
 966 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
 967                 compat_uptr_t __user *pages32,
 968                 const int __user *nodes,
 969                 int __user *status,
 970                 int flags)
 971 {
 972         const void __user * __user *pages;
 973         int i;
 974
 975         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
 976         for (i = 0; i < nr_pages; i++) {
 977                 compat_uptr_t p;
 978
 979                 if (get_user(p, pages32 + i) ||
 980                         put_user(compat_ptr(p), pages + i))
 981                         return -EFAULT;
 982         }
 983         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
 984 }
 985
 986 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 987                         compat_ulong_t maxnode,
 988                         const compat_ulong_t __user *old_nodes,
 989                         const compat_ulong_t __user *new_nodes)
 990 {
 991         unsigned long __user *old = NULL;
 992         unsigned long __user *new = NULL;
 993         nodemask_t tmp_mask;
 994         unsigned long nr_bits;
 995         unsigned long size;
 996
 997         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
 998         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
 999         if (old_nodes) {
1000                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1001                         return -EFAULT;
1002                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1003                 if (new_nodes)
1004                         new = old + size / sizeof(unsigned long);
1005                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1006                         return -EFAULT;
1007         }
1008         if (new_nodes) {
1009                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1010                         return -EFAULT;
1011                 if (new == NULL)
1012                         new = compat_alloc_user_space(size);
1013                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1014                         return -EFAULT;
1015         }
1016         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1017 }
1018 #endif
1019
1020 struct compat_sysinfo {
1021         s32 uptime;
1022         u32 loads[3];
1023         u32 totalram;
1024         u32 freeram;
1025         u32 sharedram;
1026         u32 bufferram;
1027         u32 totalswap;
1028         u32 freeswap;
1029         u16 procs;
1030         u16 pad;
1031         u32 totalhigh;
1032         u32 freehigh;
1033         u32 mem_unit;
1034         char _f[20-2*sizeof(u32)-sizeof(int)];
1035 };
1036
1037 asmlinkage long
1038 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1039 {
1040         struct sysinfo s;
1041
1042         do_sysinfo(&s);
1043
1044         /* Check to see if any memory value is too large for 32-bit and scale
1045          *  down if needed
1046          */
1047         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1048                 int bitcount = 0;
1049
1050                 while (s.mem_unit < PAGE_SIZE) {
1051                         s.mem_unit <<= 1;
1052                         bitcount++;
1053                 }
1054
1055                 s.totalram >>= bitcount;
1056                 s.freeram >>= bitcount;
1057                 s.sharedram >>= bitcount;
1058                 s.bufferram >>= bitcount;
1059                 s.totalswap >>= bitcount;
1060                 s.freeswap >>= bitcount;
1061                 s.totalhigh >>= bitcount;
1062                 s.freehigh >>= bitcount;
1063         }
1064
1065         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1066             __put_user (s.uptime, &info->uptime) ||
1067             __put_user (s.loads[0], &info->loads[0]) ||
1068             __put_user (s.loads[1], &info->loads[1]) ||
1069             __put_user (s.loads[2], &info->loads[2]) ||
1070             __put_user (s.totalram, &info->totalram) ||
1071             __put_user (s.freeram, &info->freeram) ||
1072             __put_user (s.sharedram, &info->sharedram) ||
1073             __put_user (s.bufferram, &info->bufferram) ||
1074             __put_user (s.totalswap, &info->totalswap) ||
1075             __put_user (s.freeswap, &info->freeswap) ||
1076             __put_user (s.procs, &info->procs) ||
1077             __put_user (s.totalhigh, &info->totalhigh) ||
1078             __put_user (s.freehigh, &info->freehigh) ||
1079             __put_user (s.mem_unit, &info->mem_unit))
1080                 return -EFAULT;
1081
1082         return 0;
1083 }
1084