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 #include <linux/gfp.h>
  29
  30 #include <asm/uaccess.h>
  31
  32 /*
  33  * Note that the native side is already converted to a timespec, because
  34  * that's what we want anyway.
  35  */
  36 static int compat_get_timeval(struct timespec *o,
  37                 struct compat_timeval __user *i)
  38 {
  39         long usec;
  40
  41         if (get_user(o->tv_sec, &i->tv_sec) ||
  42             get_user(usec, &i->tv_usec))
  43                 return -EFAULT;
  44         o->tv_nsec = usec * 1000;
  45         return 0;
  46 }
  47
  48 static int compat_put_timeval(struct compat_timeval __user *o,
  49                 struct timeval *i)
  50 {
  51         return (put_user(i->tv_sec, &o->tv_sec) ||
  52                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  53 }
  54
  55 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
  56                 struct timezone __user *tz)
  57 {
  58         if (tv) {
  59                 struct timeval ktv;
  60                 do_gettimeofday(&ktv);
  61                 if (compat_put_timeval(tv, &ktv))
  62                         return -EFAULT;
  63         }
  64         if (tz) {
  65                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
  66                         return -EFAULT;
  67         }
  68
  69         return 0;
  70 }
  71
  72 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
  73                 struct timezone __user *tz)
  74 {
  75         struct timespec kts;
  76         struct timezone ktz;
  77
  78         if (tv) {
  79                 if (compat_get_timeval(&kts, tv))
  80                         return -EFAULT;
  81         }
  82         if (tz) {
  83                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
  84                         return -EFAULT;
  85         }
  86
  87         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
  88 }
  89
  90 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  91 {
  92         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  93                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  94                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  95 }
  96
  97 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  98 {
  99         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 100                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 101                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 102 }
 103
 104 static long compat_nanosleep_restart(struct restart_block *restart)
 105 {
 106         struct compat_timespec __user *rmtp;
 107         struct timespec rmt;
 108         mm_segment_t oldfs;
 109         long ret;
 110
 111         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 112         oldfs = get_fs();
 113         set_fs(KERNEL_DS);
 114         ret = hrtimer_nanosleep_restart(restart);
 115         set_fs(oldfs);
 116
 117         if (ret) {
 118                 rmtp = restart->nanosleep.compat_rmtp;
 119
 120                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 121                         return -EFAULT;
 122         }
 123
 124         return ret;
 125 }
 126
 127 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 128                                      struct compat_timespec __user *rmtp)
 129 {
 130         struct timespec tu, rmt;
 131         mm_segment_t oldfs;
 132         long ret;
 133
 134         if (get_compat_timespec(&tu, rqtp))
 135                 return -EFAULT;
 136
 137         if (!timespec_valid(&tu))
 138                 return -EINVAL;
 139
 140         oldfs = get_fs();
 141         set_fs(KERNEL_DS);
 142         ret = hrtimer_nanosleep(&tu,
 143                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 144                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 145         set_fs(oldfs);
 146
 147         if (ret) {
 148                 struct restart_block *restart
 149                         = &current_thread_info()->restart_block;
 150
 151                 restart->fn = compat_nanosleep_restart;
 152                 restart->nanosleep.compat_rmtp = rmtp;
 153
 154                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 155                         return -EFAULT;
 156         }
 157
 158         return ret;
 159 }
 160
 161 static inline long get_compat_itimerval(struct itimerval *o,
 162                 struct compat_itimerval __user *i)
 163 {
 164         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 165                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 166                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 167                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 168                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 169 }
 170
 171 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 172                 struct itimerval *i)
 173 {
 174         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 175                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 176                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 177                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 178                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 179 }
 180
 181 asmlinkage long compat_sys_getitimer(int which,
 182                 struct compat_itimerval __user *it)
 183 {
 184         struct itimerval kit;
 185         int error;
 186
 187         error = do_getitimer(which, &kit);
 188         if (!error && put_compat_itimerval(it, &kit))
 189                 error = -EFAULT;
 190         return error;
 191 }
 192
 193 asmlinkage long compat_sys_setitimer(int which,
 194                 struct compat_itimerval __user *in,
 195                 struct compat_itimerval __user *out)
 196 {
 197         struct itimerval kin, kout;
 198         int error;
 199
 200         if (in) {
 201                 if (get_compat_itimerval(&kin, in))
 202                         return -EFAULT;
 203         } else
 204                 memset(&kin, 0, sizeof(kin));
 205
 206         error = do_setitimer(which, &kin, out ? &kout : NULL);
 207         if (error || !out)
 208                 return error;
 209         if (put_compat_itimerval(out, &kout))
 210                 return -EFAULT;
 211         return 0;
 212 }
 213
 214 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 215 {
 216         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 217 }
 218
 219 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 220 {
 221         if (tbuf) {
 222                 struct tms tms;
 223                 struct compat_tms tmp;
 224
 225                 do_sys_times(&tms);
 226                 /* Convert our struct tms to the compat version. */
 227                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 228                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 229                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 230                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 231                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 232                         return -EFAULT;
 233         }
 234         force_successful_syscall_return();
 235         return compat_jiffies_to_clock_t(jiffies);
 236 }
 237
 238 /*
 239  * Assumption: old_sigset_t and compat_old_sigset_t are both
 240  * types that can be passed to put_user()/get_user().
 241  */
 242
 243 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 244 {
 245         old_sigset_t s;
 246         long ret;
 247         mm_segment_t old_fs = get_fs();
 248
 249         set_fs(KERNEL_DS);
 250         ret = sys_sigpending((old_sigset_t __user *) &s);
 251         set_fs(old_fs);
 252         if (ret == 0)
 253                 ret = put_user(s, set);
 254         return ret;
 255 }
 256
 257 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 258                 compat_old_sigset_t __user *oset)
 259 {
 260         old_sigset_t s;
 261         long ret;
 262         mm_segment_t old_fs;
 263
 264         if (set && get_user(s, set))
 265                 return -EFAULT;
 266         old_fs = get_fs();
 267         set_fs(KERNEL_DS);
 268         ret = sys_sigprocmask(how,
 269                               set ? (old_sigset_t __user *) &s : NULL,
 270                               oset ? (old_sigset_t __user *) &s : NULL);
 271         set_fs(old_fs);
 272         if (ret == 0)
 273                 if (oset)
 274                         ret = put_user(s, oset);
 275         return ret;
 276 }
 277
 278 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 279                 struct compat_rlimit __user *rlim)
 280 {
 281         struct rlimit r;
 282
 283         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 284             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 285             __get_user(r.rlim_max, &rlim->rlim_max))
 286                 return -EFAULT;
 287
 288         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 289                 r.rlim_cur = RLIM_INFINITY;
 290         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 291                 r.rlim_max = RLIM_INFINITY;
 292         return do_prlimit(current, resource, &r, NULL);
 293 }
 294
 295 #ifdef COMPAT_RLIM_OLD_INFINITY
 296
 297 asmlinkage long compat_sys_old_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_old_getrlimit(resource, &r);
 306         set_fs(old_fs);
 307
 308         if (!ret) {
 309                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 310                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 311                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 312                         r.rlim_max = COMPAT_RLIM_INFINITY;
 313
 314                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 315                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 316                     __put_user(r.rlim_max, &rlim->rlim_max))
 317                         return -EFAULT;
 318         }
 319         return ret;
 320 }
 321
 322 #endif
 323
 324 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 325                 struct compat_rlimit __user *rlim)
 326 {
 327         struct rlimit r;
 328         int ret;
 329
 330         ret = do_prlimit(current, resource, NULL, &r);
 331         if (!ret) {
 332                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 333                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 334                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 335                         r.rlim_max = COMPAT_RLIM_INFINITY;
 336
 337                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 338                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 339                     __put_user(r.rlim_max, &rlim->rlim_max))
 340                         return -EFAULT;
 341         }
 342         return ret;
 343 }
 344
 345 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 346 {
 347         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 348             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 349             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 350             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 351             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 352             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 353             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 354             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 355             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 356             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 357             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 358             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 359             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 360             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 361             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 362             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 363             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 364             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 365             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 366                 return -EFAULT;
 367         return 0;
 368 }
 369
 370 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 371 {
 372         struct rusage r;
 373         int ret;
 374         mm_segment_t old_fs = get_fs();
 375
 376         set_fs(KERNEL_DS);
 377         ret = sys_getrusage(who, (struct rusage __user *) &r);
 378         set_fs(old_fs);
 379
 380         if (ret)
 381                 return ret;
 382
 383         if (put_compat_rusage(&r, ru))
 384                 return -EFAULT;
 385
 386         return 0;
 387 }
 388
 389 asmlinkage long
 390 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 391         struct compat_rusage __user *ru)
 392 {
 393         if (!ru) {
 394                 return sys_wait4(pid, stat_addr, options, NULL);
 395         } else {
 396                 struct rusage r;
 397                 int ret;
 398                 unsigned int status;
 399                 mm_segment_t old_fs = get_fs();
 400
 401                 set_fs (KERNEL_DS);
 402                 ret = sys_wait4(pid,
 403                                 (stat_addr ?
 404                                  (unsigned int __user *) &status : NULL),
 405                                 options, (struct rusage __user *) &r);
 406                 set_fs (old_fs);
 407
 408                 if (ret > 0) {
 409                         if (put_compat_rusage(&r, ru))
 410                                 return -EFAULT;
 411                         if (stat_addr && put_user(status, stat_addr))
 412                                 return -EFAULT;
 413                 }
 414                 return ret;
 415         }
 416 }
 417
 418 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 419                 struct compat_siginfo __user *uinfo, int options,
 420                 struct compat_rusage __user *uru)
 421 {
 422         siginfo_t info;
 423         struct rusage ru;
 424         long ret;
 425         mm_segment_t old_fs = get_fs();
 426
 427         memset(&info, 0, sizeof(info));
 428
 429         set_fs(KERNEL_DS);
 430         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 431                          uru ? (struct rusage __user *)&ru : NULL);
 432         set_fs(old_fs);
 433
 434         if ((ret < 0) || (info.si_signo == 0))
 435                 return ret;
 436
 437         if (uru) {
 438                 ret = put_compat_rusage(&ru, uru);
 439                 if (ret)
 440                         return ret;
 441         }
 442
 443         BUG_ON(info.si_code & __SI_MASK);
 444         info.si_code |= __SI_CHLD;
 445         return copy_siginfo_to_user32(uinfo, &info);
 446 }
 447
 448 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 449                                     unsigned len, struct cpumask *new_mask)
 450 {
 451         unsigned long *k;
 452
 453         if (len < cpumask_size())
 454                 memset(new_mask, 0, cpumask_size());
 455         else if (len > cpumask_size())
 456                 len = cpumask_size();
 457
 458         k = cpumask_bits(new_mask);
 459         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 460 }
 461
 462 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 463                                              unsigned int len,
 464                                              compat_ulong_t __user *user_mask_ptr)
 465 {
 466         cpumask_var_t new_mask;
 467         int retval;
 468
 469         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 470                 return -ENOMEM;
 471
 472         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 473         if (retval)
 474                 goto out;
 475
 476         retval = sched_setaffinity(pid, new_mask);
 477 out:
 478         free_cpumask_var(new_mask);
 479         return retval;
 480 }
 481
 482 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 483                                              compat_ulong_t __user *user_mask_ptr)
 484 {
 485         int ret;
 486         cpumask_var_t mask;
 487
 488         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 489                 return -EINVAL;
 490         if (len & (sizeof(compat_ulong_t)-1))
 491                 return -EINVAL;
 492
 493         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 494                 return -ENOMEM;
 495
 496         ret = sched_getaffinity(pid, mask);
 497         if (ret == 0) {
 498                 size_t retlen = min_t(size_t, len, cpumask_size());
 499
 500                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 501                         ret = -EFAULT;
 502                 else
 503                         ret = retlen;
 504         }
 505         free_cpumask_var(mask);
 506
 507         return ret;
 508 }
 509
 510 int get_compat_itimerspec(struct itimerspec *dst,
 511                           const struct compat_itimerspec __user *src)
 512 {
 513         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 514             get_compat_timespec(&dst->it_value, &src->it_value))
 515                 return -EFAULT;
 516         return 0;
 517 }
 518
 519 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 520                           const struct itimerspec *src)
 521 {
 522         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 523             put_compat_timespec(&src->it_value, &dst->it_value))
 524                 return -EFAULT;
 525         return 0;
 526 }
 527
 528 long compat_sys_timer_create(clockid_t which_clock,
 529                         struct compat_sigevent __user *timer_event_spec,
 530                         timer_t __user *created_timer_id)
 531 {
 532         struct sigevent __user *event = NULL;
 533
 534         if (timer_event_spec) {
 535                 struct sigevent kevent;
 536
 537                 event = compat_alloc_user_space(sizeof(*event));
 538                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 539                     copy_to_user(event, &kevent, sizeof(*event)))
 540                         return -EFAULT;
 541         }
 542
 543         return sys_timer_create(which_clock, event, created_timer_id);
 544 }
 545
 546 long compat_sys_timer_settime(timer_t timer_id, int flags,
 547                           struct compat_itimerspec __user *new,
 548                           struct compat_itimerspec __user *old)
 549 {
 550         long err;
 551         mm_segment_t oldfs;
 552         struct itimerspec newts, oldts;
 553
 554         if (!new)
 555                 return -EINVAL;
 556         if (get_compat_itimerspec(&newts, new))
 557                 return -EFAULT;
 558         oldfs = get_fs();
 559         set_fs(KERNEL_DS);
 560         err = sys_timer_settime(timer_id, flags,
 561                                 (struct itimerspec __user *) &newts,
 562                                 (struct itimerspec __user *) &oldts);
 563         set_fs(oldfs);
 564         if (!err && old && put_compat_itimerspec(old, &oldts))
 565                 return -EFAULT;
 566         return err;
 567 }
 568
 569 long compat_sys_timer_gettime(timer_t timer_id,
 570                 struct compat_itimerspec __user *setting)
 571 {
 572         long err;
 573         mm_segment_t oldfs;
 574         struct itimerspec ts;
 575
 576         oldfs = get_fs();
 577         set_fs(KERNEL_DS);
 578         err = sys_timer_gettime(timer_id,
 579                                 (struct itimerspec __user *) &ts);
 580         set_fs(oldfs);
 581         if (!err && put_compat_itimerspec(setting, &ts))
 582                 return -EFAULT;
 583         return err;
 584 }
 585
 586 long compat_sys_clock_settime(clockid_t which_clock,
 587                 struct compat_timespec __user *tp)
 588 {
 589         long err;
 590         mm_segment_t oldfs;
 591         struct timespec ts;
 592
 593         if (get_compat_timespec(&ts, tp))
 594                 return -EFAULT;
 595         oldfs = get_fs();
 596         set_fs(KERNEL_DS);
 597         err = sys_clock_settime(which_clock,
 598                                 (struct timespec __user *) &ts);
 599         set_fs(oldfs);
 600         return err;
 601 }
 602
 603 long compat_sys_clock_gettime(clockid_t which_clock,
 604                 struct compat_timespec __user *tp)
 605 {
 606         long err;
 607         mm_segment_t oldfs;
 608         struct timespec ts;
 609
 610         oldfs = get_fs();
 611         set_fs(KERNEL_DS);
 612         err = sys_clock_gettime(which_clock,
 613                                 (struct timespec __user *) &ts);
 614         set_fs(oldfs);
 615         if (!err && put_compat_timespec(&ts, tp))
 616                 return -EFAULT;
 617         return err;
 618 }
 619
 620 long compat_sys_clock_getres(clockid_t which_clock,
 621                 struct compat_timespec __user *tp)
 622 {
 623         long err;
 624         mm_segment_t oldfs;
 625         struct timespec ts;
 626
 627         oldfs = get_fs();
 628         set_fs(KERNEL_DS);
 629         err = sys_clock_getres(which_clock,
 630                                (struct timespec __user *) &ts);
 631         set_fs(oldfs);
 632         if (!err && tp && put_compat_timespec(&ts, tp))
 633                 return -EFAULT;
 634         return err;
 635 }
 636
 637 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 638 {
 639         long err;
 640         mm_segment_t oldfs;
 641         struct timespec tu;
 642         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 643
 644         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 645         oldfs = get_fs();
 646         set_fs(KERNEL_DS);
 647         err = clock_nanosleep_restart(restart);
 648         set_fs(oldfs);
 649
 650         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 651             put_compat_timespec(&tu, rmtp))
 652                 return -EFAULT;
 653
 654         if (err == -ERESTART_RESTARTBLOCK) {
 655                 restart->fn = compat_clock_nanosleep_restart;
 656                 restart->nanosleep.compat_rmtp = rmtp;
 657         }
 658         return err;
 659 }
 660
 661 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 662                             struct compat_timespec __user *rqtp,
 663                             struct compat_timespec __user *rmtp)
 664 {
 665         long err;
 666         mm_segment_t oldfs;
 667         struct timespec in, out;
 668         struct restart_block *restart;
 669
 670         if (get_compat_timespec(&in, rqtp))
 671                 return -EFAULT;
 672
 673         oldfs = get_fs();
 674         set_fs(KERNEL_DS);
 675         err = sys_clock_nanosleep(which_clock, flags,
 676                                   (struct timespec __user *) &in,
 677                                   (struct timespec __user *) &out);
 678         set_fs(oldfs);
 679
 680         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 681             put_compat_timespec(&out, rmtp))
 682                 return -EFAULT;
 683
 684         if (err == -ERESTART_RESTARTBLOCK) {
 685                 restart = &current_thread_info()->restart_block;
 686                 restart->fn = compat_clock_nanosleep_restart;
 687                 restart->nanosleep.compat_rmtp = rmtp;
 688         }
 689         return err;
 690 }
 691
 692 /*
 693  * We currently only need the following fields from the sigevent
 694  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 695  * sigev_notify_thread_id).  The others are handled in user mode.
 696  * We also assume that copying sigev_value.sival_int is sufficient
 697  * to keep all the bits of sigev_value.sival_ptr intact.
 698  */
 699 int get_compat_sigevent(struct sigevent *event,
 700                 const struct compat_sigevent __user *u_event)
 701 {
 702         memset(event, 0, sizeof(*event));
 703         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 704                 __get_user(event->sigev_value.sival_int,
 705                         &u_event->sigev_value.sival_int) ||
 706                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 707                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 708                 __get_user(event->sigev_notify_thread_id,
 709                         &u_event->sigev_notify_thread_id))
 710                 ? -EFAULT : 0;
 711 }
 712
 713 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 714                        unsigned long bitmap_size)
 715 {
 716         int i, j;
 717         unsigned long m;
 718         compat_ulong_t um;
 719         unsigned long nr_compat_longs;
 720
 721         /* align bitmap up to nearest compat_long_t boundary */
 722         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 723
 724         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 725                 return -EFAULT;
 726
 727         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 728
 729         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 730                 m = 0;
 731
 732                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 733                         /*
 734                          * We dont want to read past the end of the userspace
 735                          * bitmap. We must however ensure the end of the
 736                          * kernel bitmap is zeroed.
 737                          */
 738                         if (nr_compat_longs-- > 0) {
 739                                 if (__get_user(um, umask))
 740                                         return -EFAULT;
 741                         } else {
 742                                 um = 0;
 743                         }
 744
 745                         umask++;
 746                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 747                 }
 748                 *mask++ = m;
 749         }
 750
 751         return 0;
 752 }
 753
 754 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 755                        unsigned long bitmap_size)
 756 {
 757         int i, j;
 758         unsigned long m;
 759         compat_ulong_t um;
 760         unsigned long nr_compat_longs;
 761
 762         /* align bitmap up to nearest compat_long_t boundary */
 763         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 764
 765         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 766                 return -EFAULT;
 767
 768         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 769
 770         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 771                 m = *mask++;
 772
 773                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 774                         um = m;
 775
 776                         /*
 777                          * We dont want to write past the end of the userspace
 778                          * bitmap.
 779                          */
 780                         if (nr_compat_longs-- > 0) {
 781                                 if (__put_user(um, umask))
 782                                         return -EFAULT;
 783                         }
 784
 785                         umask++;
 786                         m >>= 4*sizeof(um);
 787                         m >>= 4*sizeof(um);
 788                 }
 789         }
 790
 791         return 0;
 792 }
 793
 794 void
 795 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 796 {
 797         switch (_NSIG_WORDS) {
 798         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 799         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 800         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 801         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 802         }
 803 }
 804
 805 asmlinkage long
 806 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 807                 struct compat_siginfo __user *uinfo,
 808                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 809 {
 810         compat_sigset_t s32;
 811         sigset_t s;
 812         int sig;
 813         struct timespec t;
 814         siginfo_t info;
 815         long ret, timeout = 0;
 816
 817         if (sigsetsize != sizeof(sigset_t))
 818                 return -EINVAL;
 819
 820         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 821                 return -EFAULT;
 822         sigset_from_compat(&s, &s32);
 823         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 824         signotset(&s);
 825
 826         if (uts) {
 827                 if (get_compat_timespec (&t, uts))
 828                         return -EFAULT;
 829                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 830                                 || t.tv_sec < 0)
 831                         return -EINVAL;
 832         }
 833
 834         spin_lock_irq(&current->sighand->siglock);
 835         sig = dequeue_signal(current, &s, &info);
 836         if (!sig) {
 837                 timeout = MAX_SCHEDULE_TIMEOUT;
 838                 if (uts)
 839                         timeout = timespec_to_jiffies(&t)
 840                                 +(t.tv_sec || t.tv_nsec);
 841                 if (timeout) {
 842                         current->real_blocked = current->blocked;
 843                         sigandsets(&current->blocked, &current->blocked, &s);
 844
 845                         recalc_sigpending();
 846                         spin_unlock_irq(&current->sighand->siglock);
 847
 848                         timeout = schedule_timeout_interruptible(timeout);
 849
 850                         spin_lock_irq(&current->sighand->siglock);
 851                         sig = dequeue_signal(current, &s, &info);
 852                         current->blocked = current->real_blocked;
 853                         siginitset(&current->real_blocked, 0);
 854                         recalc_sigpending();
 855                 }
 856         }
 857         spin_unlock_irq(&current->sighand->siglock);
 858
 859         if (sig) {
 860                 ret = sig;
 861                 if (uinfo) {
 862                         if (copy_siginfo_to_user32(uinfo, &info))
 863                                 ret = -EFAULT;
 864                 }
 865         }else {
 866                 ret = timeout?-EINTR:-EAGAIN;
 867         }
 868         return ret;
 869
 870 }
 871
 872 asmlinkage long
 873 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 874                              struct compat_siginfo __user *uinfo)
 875 {
 876         siginfo_t info;
 877
 878         if (copy_siginfo_from_user32(&info, uinfo))
 879                 return -EFAULT;
 880         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 881 }
 882
 883 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 884
 885 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 886
 887 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 888 {
 889         compat_time_t i;
 890         struct timeval tv;
 891
 892         do_gettimeofday(&tv);
 893         i = tv.tv_sec;
 894
 895         if (tloc) {
 896                 if (put_user(i,tloc))
 897                         return -EFAULT;
 898         }
 899         force_successful_syscall_return();
 900         return i;
 901 }
 902
 903 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 904 {
 905         struct timespec tv;
 906         int err;
 907
 908         if (get_user(tv.tv_sec, tptr))
 909                 return -EFAULT;
 910
 911         tv.tv_nsec = 0;
 912
 913         err = security_settime(&tv, NULL);
 914         if (err)
 915                 return err;
 916
 917         do_settimeofday(&tv);
 918         return 0;
 919 }
 920
 921 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 922
 923 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 924 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 925 {
 926         sigset_t newset;
 927         compat_sigset_t newset32;
 928
 929         /* XXX: Don't preclude handling different sized sigset_t's.  */
 930         if (sigsetsize != sizeof(sigset_t))
 931                 return -EINVAL;
 932
 933         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 934                 return -EFAULT;
 935         sigset_from_compat(&newset, &newset32);
 936         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 937
 938         spin_lock_irq(&current->sighand->siglock);
 939         current->saved_sigmask = current->blocked;
 940         current->blocked = newset;
 941         recalc_sigpending();
 942         spin_unlock_irq(&current->sighand->siglock);
 943
 944         current->state = TASK_INTERRUPTIBLE;
 945         schedule();
 946         set_restore_sigmask();
 947         return -ERESTARTNOHAND;
 948 }
 949 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 950
 951 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 952 {
 953         struct timex txc;
 954         int ret;
 955
 956         memset(&txc, 0, sizeof(struct timex));
 957
 958         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 959                         __get_user(txc.modes, &utp->modes) ||
 960                         __get_user(txc.offset, &utp->offset) ||
 961                         __get_user(txc.freq, &utp->freq) ||
 962                         __get_user(txc.maxerror, &utp->maxerror) ||
 963                         __get_user(txc.esterror, &utp->esterror) ||
 964                         __get_user(txc.status, &utp->status) ||
 965                         __get_user(txc.constant, &utp->constant) ||
 966                         __get_user(txc.precision, &utp->precision) ||
 967                         __get_user(txc.tolerance, &utp->tolerance) ||
 968                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 969                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 970                         __get_user(txc.tick, &utp->tick) ||
 971                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 972                         __get_user(txc.jitter, &utp->jitter) ||
 973                         __get_user(txc.shift, &utp->shift) ||
 974                         __get_user(txc.stabil, &utp->stabil) ||
 975                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 976                         __get_user(txc.calcnt, &utp->calcnt) ||
 977                         __get_user(txc.errcnt, &utp->errcnt) ||
 978                         __get_user(txc.stbcnt, &utp->stbcnt))
 979                 return -EFAULT;
 980
 981         ret = do_adjtimex(&txc);
 982
 983         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 984                         __put_user(txc.modes, &utp->modes) ||
 985                         __put_user(txc.offset, &utp->offset) ||
 986                         __put_user(txc.freq, &utp->freq) ||
 987                         __put_user(txc.maxerror, &utp->maxerror) ||
 988                         __put_user(txc.esterror, &utp->esterror) ||
 989                         __put_user(txc.status, &utp->status) ||
 990                         __put_user(txc.constant, &utp->constant) ||
 991                         __put_user(txc.precision, &utp->precision) ||
 992                         __put_user(txc.tolerance, &utp->tolerance) ||
 993                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 994                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 995                         __put_user(txc.tick, &utp->tick) ||
 996                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
 997                         __put_user(txc.jitter, &utp->jitter) ||
 998                         __put_user(txc.shift, &utp->shift) ||
 999                         __put_user(txc.stabil, &utp->stabil) ||
1000                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1001                         __put_user(txc.calcnt, &utp->calcnt) ||
1002                         __put_user(txc.errcnt, &utp->errcnt) ||
1003                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1004                         __put_user(txc.tai, &utp->tai))
1005                 ret = -EFAULT;
1006
1007         return ret;
1008 }
1009
1010 #ifdef CONFIG_NUMA
1011 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1012                 compat_uptr_t __user *pages32,
1013                 const int __user *nodes,
1014                 int __user *status,
1015                 int flags)
1016 {
1017         const void __user * __user *pages;
1018         int i;
1019
1020         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1021         for (i = 0; i < nr_pages; i++) {
1022                 compat_uptr_t p;
1023
1024                 if (get_user(p, pages32 + i) ||
1025                         put_user(compat_ptr(p), pages + i))
1026                         return -EFAULT;
1027         }
1028         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1029 }
1030
1031 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1032                         compat_ulong_t maxnode,
1033                         const compat_ulong_t __user *old_nodes,
1034                         const compat_ulong_t __user *new_nodes)
1035 {
1036         unsigned long __user *old = NULL;
1037         unsigned long __user *new = NULL;
1038         nodemask_t tmp_mask;
1039         unsigned long nr_bits;
1040         unsigned long size;
1041
1042         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1043         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1044         if (old_nodes) {
1045                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1046                         return -EFAULT;
1047                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1048                 if (new_nodes)
1049                         new = old + size / sizeof(unsigned long);
1050                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1051                         return -EFAULT;
1052         }
1053         if (new_nodes) {
1054                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1055                         return -EFAULT;
1056                 if (new == NULL)
1057                         new = compat_alloc_user_space(size);
1058                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1059                         return -EFAULT;
1060         }
1061         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1062 }
1063 #endif
1064
1065 struct compat_sysinfo {
1066         s32 uptime;
1067         u32 loads[3];
1068         u32 totalram;
1069         u32 freeram;
1070         u32 sharedram;
1071         u32 bufferram;
1072         u32 totalswap;
1073         u32 freeswap;
1074         u16 procs;
1075         u16 pad;
1076         u32 totalhigh;
1077         u32 freehigh;
1078         u32 mem_unit;
1079         char _f[20-2*sizeof(u32)-sizeof(int)];
1080 };
1081
1082 asmlinkage long
1083 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1084 {
1085         struct sysinfo s;
1086
1087         do_sysinfo(&s);
1088
1089         /* Check to see if any memory value is too large for 32-bit and scale
1090          *  down if needed
1091          */
1092         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1093                 int bitcount = 0;
1094
1095                 while (s.mem_unit < PAGE_SIZE) {
1096                         s.mem_unit <<= 1;
1097                         bitcount++;
1098                 }
1099
1100                 s.totalram >>= bitcount;
1101                 s.freeram >>= bitcount;
1102                 s.sharedram >>= bitcount;
1103                 s.bufferram >>= bitcount;
1104                 s.totalswap >>= bitcount;
1105                 s.freeswap >>= bitcount;
1106                 s.totalhigh >>= bitcount;
1107                 s.freehigh >>= bitcount;
1108         }
1109
1110         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1111             __put_user (s.uptime, &info->uptime) ||
1112             __put_user (s.loads[0], &info->loads[0]) ||
1113             __put_user (s.loads[1], &info->loads[1]) ||
1114             __put_user (s.loads[2], &info->loads[2]) ||
1115             __put_user (s.totalram, &info->totalram) ||
1116             __put_user (s.freeram, &info->freeram) ||
1117             __put_user (s.sharedram, &info->sharedram) ||
1118             __put_user (s.bufferram, &info->bufferram) ||
1119             __put_user (s.totalswap, &info->totalswap) ||
1120             __put_user (s.freeswap, &info->freeswap) ||
1121             __put_user (s.procs, &info->procs) ||
1122             __put_user (s.totalhigh, &info->totalhigh) ||
1123             __put_user (s.freehigh, &info->freehigh) ||
1124             __put_user (s.mem_unit, &info->mem_unit))
1125                 return -EFAULT;
1126
1127         return 0;
1128 }
1129
1130 /*
1131  * Allocate user-space memory for the duration of a single system call,
1132  * in order to marshall parameters inside a compat thunk.
1133  */
1134 void __user *compat_alloc_user_space(unsigned long len)
1135 {
1136         void __user *ptr;
1137
1138         /* If len would occupy more than half of the entire compat space... */
1139         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1140                 return NULL;
1141
1142         ptr = arch_compat_alloc_user_space(len);
1143
1144         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1145                 return NULL;
1146
1147         return ptr;
1148 }
1149 EXPORT_SYMBOL_GPL(compat_alloc_user_space);