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
 498         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 499                 return -EINVAL;
 500         if (len & (sizeof(compat_ulong_t)-1))
 501                 return -EINVAL;
 502
 503         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 504                 return -ENOMEM;
 505
 506         ret = sched_getaffinity(pid, mask);
 507         if (ret == 0) {
 508                 size_t retlen = min_t(size_t, len, cpumask_size());
 509
 510                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 511                         ret = -EFAULT;
 512                 else
 513                         ret = retlen;
 514         }
 515         free_cpumask_var(mask);
 516
 517         return ret;
 518 }
 519
 520 int get_compat_itimerspec(struct itimerspec *dst,
 521                           const struct compat_itimerspec __user *src)
 522 {
 523         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 524             get_compat_timespec(&dst->it_value, &src->it_value))
 525                 return -EFAULT;
 526         return 0;
 527 }
 528
 529 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 530                           const struct itimerspec *src)
 531 {
 532         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 533             put_compat_timespec(&src->it_value, &dst->it_value))
 534                 return -EFAULT;
 535         return 0;
 536 }
 537
 538 long compat_sys_timer_create(clockid_t which_clock,
 539                         struct compat_sigevent __user *timer_event_spec,
 540                         timer_t __user *created_timer_id)
 541 {
 542         struct sigevent __user *event = NULL;
 543
 544         if (timer_event_spec) {
 545                 struct sigevent kevent;
 546
 547                 event = compat_alloc_user_space(sizeof(*event));
 548                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 549                     copy_to_user(event, &kevent, sizeof(*event)))
 550                         return -EFAULT;
 551         }
 552
 553         return sys_timer_create(which_clock, event, created_timer_id);
 554 }
 555
 556 long compat_sys_timer_settime(timer_t timer_id, int flags,
 557                           struct compat_itimerspec __user *new,
 558                           struct compat_itimerspec __user *old)
 559 {
 560         long err;
 561         mm_segment_t oldfs;
 562         struct itimerspec newts, oldts;
 563
 564         if (!new)
 565                 return -EINVAL;
 566         if (get_compat_itimerspec(&newts, new))
 567                 return -EFAULT;
 568         oldfs = get_fs();
 569         set_fs(KERNEL_DS);
 570         err = sys_timer_settime(timer_id, flags,
 571                                 (struct itimerspec __user *) &newts,
 572                                 (struct itimerspec __user *) &oldts);
 573         set_fs(oldfs);
 574         if (!err && old && put_compat_itimerspec(old, &oldts))
 575                 return -EFAULT;
 576         return err;
 577 }
 578
 579 long compat_sys_timer_gettime(timer_t timer_id,
 580                 struct compat_itimerspec __user *setting)
 581 {
 582         long err;
 583         mm_segment_t oldfs;
 584         struct itimerspec ts;
 585
 586         oldfs = get_fs();
 587         set_fs(KERNEL_DS);
 588         err = sys_timer_gettime(timer_id,
 589                                 (struct itimerspec __user *) &ts);
 590         set_fs(oldfs);
 591         if (!err && put_compat_itimerspec(setting, &ts))
 592                 return -EFAULT;
 593         return err;
 594 }
 595
 596 long compat_sys_clock_settime(clockid_t which_clock,
 597                 struct compat_timespec __user *tp)
 598 {
 599         long err;
 600         mm_segment_t oldfs;
 601         struct timespec ts;
 602
 603         if (get_compat_timespec(&ts, tp))
 604                 return -EFAULT;
 605         oldfs = get_fs();
 606         set_fs(KERNEL_DS);
 607         err = sys_clock_settime(which_clock,
 608                                 (struct timespec __user *) &ts);
 609         set_fs(oldfs);
 610         return err;
 611 }
 612
 613 long compat_sys_clock_gettime(clockid_t which_clock,
 614                 struct compat_timespec __user *tp)
 615 {
 616         long err;
 617         mm_segment_t oldfs;
 618         struct timespec ts;
 619
 620         oldfs = get_fs();
 621         set_fs(KERNEL_DS);
 622         err = sys_clock_gettime(which_clock,
 623                                 (struct timespec __user *) &ts);
 624         set_fs(oldfs);
 625         if (!err && put_compat_timespec(&ts, tp))
 626                 return -EFAULT;
 627         return err;
 628 }
 629
 630 long compat_sys_clock_getres(clockid_t which_clock,
 631                 struct compat_timespec __user *tp)
 632 {
 633         long err;
 634         mm_segment_t oldfs;
 635         struct timespec ts;
 636
 637         oldfs = get_fs();
 638         set_fs(KERNEL_DS);
 639         err = sys_clock_getres(which_clock,
 640                                (struct timespec __user *) &ts);
 641         set_fs(oldfs);
 642         if (!err && tp && put_compat_timespec(&ts, tp))
 643                 return -EFAULT;
 644         return err;
 645 }
 646
 647 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 648 {
 649         long err;
 650         mm_segment_t oldfs;
 651         struct timespec tu;
 652         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 653
 654         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 655         oldfs = get_fs();
 656         set_fs(KERNEL_DS);
 657         err = clock_nanosleep_restart(restart);
 658         set_fs(oldfs);
 659
 660         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 661             put_compat_timespec(&tu, rmtp))
 662                 return -EFAULT;
 663
 664         if (err == -ERESTART_RESTARTBLOCK) {
 665                 restart->fn = compat_clock_nanosleep_restart;
 666                 restart->nanosleep.compat_rmtp = rmtp;
 667         }
 668         return err;
 669 }
 670
 671 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 672                             struct compat_timespec __user *rqtp,
 673                             struct compat_timespec __user *rmtp)
 674 {
 675         long err;
 676         mm_segment_t oldfs;
 677         struct timespec in, out;
 678         struct restart_block *restart;
 679
 680         if (get_compat_timespec(&in, rqtp))
 681                 return -EFAULT;
 682
 683         oldfs = get_fs();
 684         set_fs(KERNEL_DS);
 685         err = sys_clock_nanosleep(which_clock, flags,
 686                                   (struct timespec __user *) &in,
 687                                   (struct timespec __user *) &out);
 688         set_fs(oldfs);
 689
 690         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 691             put_compat_timespec(&out, rmtp))
 692                 return -EFAULT;
 693
 694         if (err == -ERESTART_RESTARTBLOCK) {
 695                 restart = &current_thread_info()->restart_block;
 696                 restart->fn = compat_clock_nanosleep_restart;
 697                 restart->nanosleep.compat_rmtp = rmtp;
 698         }
 699         return err;
 700 }
 701
 702 /*
 703  * We currently only need the following fields from the sigevent
 704  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 705  * sigev_notify_thread_id).  The others are handled in user mode.
 706  * We also assume that copying sigev_value.sival_int is sufficient
 707  * to keep all the bits of sigev_value.sival_ptr intact.
 708  */
 709 int get_compat_sigevent(struct sigevent *event,
 710                 const struct compat_sigevent __user *u_event)
 711 {
 712         memset(event, 0, sizeof(*event));
 713         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 714                 __get_user(event->sigev_value.sival_int,
 715                         &u_event->sigev_value.sival_int) ||
 716                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 717                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 718                 __get_user(event->sigev_notify_thread_id,
 719                         &u_event->sigev_notify_thread_id))
 720                 ? -EFAULT : 0;
 721 }
 722
 723 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 724                        unsigned long bitmap_size)
 725 {
 726         int i, j;
 727         unsigned long m;
 728         compat_ulong_t um;
 729         unsigned long nr_compat_longs;
 730
 731         /* align bitmap up to nearest compat_long_t boundary */
 732         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 733
 734         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 735                 return -EFAULT;
 736
 737         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 738
 739         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 740                 m = 0;
 741
 742                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 743                         /*
 744                          * We dont want to read past the end of the userspace
 745                          * bitmap. We must however ensure the end of the
 746                          * kernel bitmap is zeroed.
 747                          */
 748                         if (nr_compat_longs-- > 0) {
 749                                 if (__get_user(um, umask))
 750                                         return -EFAULT;
 751                         } else {
 752                                 um = 0;
 753                         }
 754
 755                         umask++;
 756                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 757                 }
 758                 *mask++ = m;
 759         }
 760
 761         return 0;
 762 }
 763
 764 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 765                        unsigned long bitmap_size)
 766 {
 767         int i, j;
 768         unsigned long m;
 769         compat_ulong_t um;
 770         unsigned long nr_compat_longs;
 771
 772         /* align bitmap up to nearest compat_long_t boundary */
 773         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 774
 775         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 776                 return -EFAULT;
 777
 778         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 779
 780         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 781                 m = *mask++;
 782
 783                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 784                         um = m;
 785
 786                         /*
 787                          * We dont want to write past the end of the userspace
 788                          * bitmap.
 789                          */
 790                         if (nr_compat_longs-- > 0) {
 791                                 if (__put_user(um, umask))
 792                                         return -EFAULT;
 793                         }
 794
 795                         umask++;
 796                         m >>= 4*sizeof(um);
 797                         m >>= 4*sizeof(um);
 798                 }
 799         }
 800
 801         return 0;
 802 }
 803
 804 void
 805 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 806 {
 807         switch (_NSIG_WORDS) {
 808         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 809         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 810         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 811         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 812         }
 813 }
 814
 815 asmlinkage long
 816 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 817                 struct compat_siginfo __user *uinfo,
 818                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 819 {
 820         compat_sigset_t s32;
 821         sigset_t s;
 822         int sig;
 823         struct timespec t;
 824         siginfo_t info;
 825         long ret, timeout = 0;
 826
 827         if (sigsetsize != sizeof(sigset_t))
 828                 return -EINVAL;
 829
 830         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 831                 return -EFAULT;
 832         sigset_from_compat(&s, &s32);
 833         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 834         signotset(&s);
 835
 836         if (uts) {
 837                 if (get_compat_timespec (&t, uts))
 838                         return -EFAULT;
 839                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 840                                 || t.tv_sec < 0)
 841                         return -EINVAL;
 842         }
 843
 844         spin_lock_irq(&current->sighand->siglock);
 845         sig = dequeue_signal(current, &s, &info);
 846         if (!sig) {
 847                 timeout = MAX_SCHEDULE_TIMEOUT;
 848                 if (uts)
 849                         timeout = timespec_to_jiffies(&t)
 850                                 +(t.tv_sec || t.tv_nsec);
 851                 if (timeout) {
 852                         current->real_blocked = current->blocked;
 853                         sigandsets(&current->blocked, &current->blocked, &s);
 854
 855                         recalc_sigpending();
 856                         spin_unlock_irq(&current->sighand->siglock);
 857
 858                         timeout = schedule_timeout_interruptible(timeout);
 859
 860                         spin_lock_irq(&current->sighand->siglock);
 861                         sig = dequeue_signal(current, &s, &info);
 862                         current->blocked = current->real_blocked;
 863                         siginitset(&current->real_blocked, 0);
 864                         recalc_sigpending();
 865                 }
 866         }
 867         spin_unlock_irq(&current->sighand->siglock);
 868
 869         if (sig) {
 870                 ret = sig;
 871                 if (uinfo) {
 872                         if (copy_siginfo_to_user32(uinfo, &info))
 873                                 ret = -EFAULT;
 874                 }
 875         }else {
 876                 ret = timeout?-EINTR:-EAGAIN;
 877         }
 878         return ret;
 879
 880 }
 881
 882 asmlinkage long
 883 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 884                              struct compat_siginfo __user *uinfo)
 885 {
 886         siginfo_t info;
 887
 888         if (copy_siginfo_from_user32(&info, uinfo))
 889                 return -EFAULT;
 890         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 891 }
 892
 893 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 894
 895 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 896
 897 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 898 {
 899         compat_time_t i;
 900         struct timeval tv;
 901
 902         do_gettimeofday(&tv);
 903         i = tv.tv_sec;
 904
 905         if (tloc) {
 906                 if (put_user(i,tloc))
 907                         return -EFAULT;
 908         }
 909         force_successful_syscall_return();
 910         return i;
 911 }
 912
 913 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 914 {
 915         struct timespec tv;
 916         int err;
 917
 918         if (get_user(tv.tv_sec, tptr))
 919                 return -EFAULT;
 920
 921         tv.tv_nsec = 0;
 922
 923         err = security_settime(&tv, NULL);
 924         if (err)
 925                 return err;
 926
 927         do_settimeofday(&tv);
 928         return 0;
 929 }
 930
 931 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 932
 933 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 934 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 935 {
 936         sigset_t newset;
 937         compat_sigset_t newset32;
 938
 939         /* XXX: Don't preclude handling different sized sigset_t's.  */
 940         if (sigsetsize != sizeof(sigset_t))
 941                 return -EINVAL;
 942
 943         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 944                 return -EFAULT;
 945         sigset_from_compat(&newset, &newset32);
 946         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 947
 948         spin_lock_irq(&current->sighand->siglock);
 949         current->saved_sigmask = current->blocked;
 950         current->blocked = newset;
 951         recalc_sigpending();
 952         spin_unlock_irq(&current->sighand->siglock);
 953
 954         current->state = TASK_INTERRUPTIBLE;
 955         schedule();
 956         set_restore_sigmask();
 957         return -ERESTARTNOHAND;
 958 }
 959 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 960
 961 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 962 {
 963         struct timex txc;
 964         int ret;
 965
 966         memset(&txc, 0, sizeof(struct timex));
 967
 968         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 969                         __get_user(txc.modes, &utp->modes) ||
 970                         __get_user(txc.offset, &utp->offset) ||
 971                         __get_user(txc.freq, &utp->freq) ||
 972                         __get_user(txc.maxerror, &utp->maxerror) ||
 973                         __get_user(txc.esterror, &utp->esterror) ||
 974                         __get_user(txc.status, &utp->status) ||
 975                         __get_user(txc.constant, &utp->constant) ||
 976                         __get_user(txc.precision, &utp->precision) ||
 977                         __get_user(txc.tolerance, &utp->tolerance) ||
 978                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 979                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 980                         __get_user(txc.tick, &utp->tick) ||
 981                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 982                         __get_user(txc.jitter, &utp->jitter) ||
 983                         __get_user(txc.shift, &utp->shift) ||
 984                         __get_user(txc.stabil, &utp->stabil) ||
 985                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 986                         __get_user(txc.calcnt, &utp->calcnt) ||
 987                         __get_user(txc.errcnt, &utp->errcnt) ||
 988                         __get_user(txc.stbcnt, &utp->stbcnt))
 989                 return -EFAULT;
 990
 991         ret = do_adjtimex(&txc);
 992
 993         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 994                         __put_user(txc.modes, &utp->modes) ||
 995                         __put_user(txc.offset, &utp->offset) ||
 996                         __put_user(txc.freq, &utp->freq) ||
 997                         __put_user(txc.maxerror, &utp->maxerror) ||
 998                         __put_user(txc.esterror, &utp->esterror) ||
 999                         __put_user(txc.status, &utp->status) ||
1000                         __put_user(txc.constant, &utp->constant) ||
1001                         __put_user(txc.precision, &utp->precision) ||
1002                         __put_user(txc.tolerance, &utp->tolerance) ||
1003                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1004                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1005                         __put_user(txc.tick, &utp->tick) ||
1006                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1007                         __put_user(txc.jitter, &utp->jitter) ||
1008                         __put_user(txc.shift, &utp->shift) ||
1009                         __put_user(txc.stabil, &utp->stabil) ||
1010                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1011                         __put_user(txc.calcnt, &utp->calcnt) ||
1012                         __put_user(txc.errcnt, &utp->errcnt) ||
1013                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1014                         __put_user(txc.tai, &utp->tai))
1015                 ret = -EFAULT;
1016
1017         return ret;
1018 }
1019
1020 #ifdef CONFIG_NUMA
1021 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1022                 compat_uptr_t __user *pages32,
1023                 const int __user *nodes,
1024                 int __user *status,
1025                 int flags)
1026 {
1027         const void __user * __user *pages;
1028         int i;
1029
1030         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1031         for (i = 0; i < nr_pages; i++) {
1032                 compat_uptr_t p;
1033
1034                 if (get_user(p, pages32 + i) ||
1035                         put_user(compat_ptr(p), pages + i))
1036                         return -EFAULT;
1037         }
1038         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1039 }
1040
1041 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1042                         compat_ulong_t maxnode,
1043                         const compat_ulong_t __user *old_nodes,
1044                         const compat_ulong_t __user *new_nodes)
1045 {
1046         unsigned long __user *old = NULL;
1047         unsigned long __user *new = NULL;
1048         nodemask_t tmp_mask;
1049         unsigned long nr_bits;
1050         unsigned long size;
1051
1052         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1053         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1054         if (old_nodes) {
1055                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1056                         return -EFAULT;
1057                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1058                 if (new_nodes)
1059                         new = old + size / sizeof(unsigned long);
1060                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1061                         return -EFAULT;
1062         }
1063         if (new_nodes) {
1064                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1065                         return -EFAULT;
1066                 if (new == NULL)
1067                         new = compat_alloc_user_space(size);
1068                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1069                         return -EFAULT;
1070         }
1071         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1072 }
1073 #endif
1074
1075 struct compat_sysinfo {
1076         s32 uptime;
1077         u32 loads[3];
1078         u32 totalram;
1079         u32 freeram;
1080         u32 sharedram;
1081         u32 bufferram;
1082         u32 totalswap;
1083         u32 freeswap;
1084         u16 procs;
1085         u16 pad;
1086         u32 totalhigh;
1087         u32 freehigh;
1088         u32 mem_unit;
1089         char _f[20-2*sizeof(u32)-sizeof(int)];
1090 };
1091
1092 asmlinkage long
1093 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1094 {
1095         struct sysinfo s;
1096
1097         do_sysinfo(&s);
1098
1099         /* Check to see if any memory value is too large for 32-bit and scale
1100          *  down if needed
1101          */
1102         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1103                 int bitcount = 0;
1104
1105                 while (s.mem_unit < PAGE_SIZE) {
1106                         s.mem_unit <<= 1;
1107                         bitcount++;
1108                 }
1109
1110                 s.totalram >>= bitcount;
1111                 s.freeram >>= bitcount;
1112                 s.sharedram >>= bitcount;
1113                 s.bufferram >>= bitcount;
1114                 s.totalswap >>= bitcount;
1115                 s.freeswap >>= bitcount;
1116                 s.totalhigh >>= bitcount;
1117                 s.freehigh >>= bitcount;
1118         }
1119
1120         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1121             __put_user (s.uptime, &info->uptime) ||
1122             __put_user (s.loads[0], &info->loads[0]) ||
1123             __put_user (s.loads[1], &info->loads[1]) ||
1124             __put_user (s.loads[2], &info->loads[2]) ||
1125             __put_user (s.totalram, &info->totalram) ||
1126             __put_user (s.freeram, &info->freeram) ||
1127             __put_user (s.sharedram, &info->sharedram) ||
1128             __put_user (s.bufferram, &info->bufferram) ||
1129             __put_user (s.totalswap, &info->totalswap) ||
1130             __put_user (s.freeswap, &info->freeswap) ||
1131             __put_user (s.procs, &info->procs) ||
1132             __put_user (s.totalhigh, &info->totalhigh) ||
1133             __put_user (s.freehigh, &info->freehigh) ||
1134             __put_user (s.mem_unit, &info->mem_unit))
1135                 return -EFAULT;
1136
1137         return 0;
1138 }