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         int ret;
 283         mm_segment_t old_fs = get_fs ();
 284
 285         if (resource >= RLIM_NLIMITS)
 286                 return -EINVAL;
 287
 288         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 289             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 290             __get_user(r.rlim_max, &rlim->rlim_max))
 291                 return -EFAULT;
 292
 293         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 294                 r.rlim_cur = RLIM_INFINITY;
 295         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 296                 r.rlim_max = RLIM_INFINITY;
 297         set_fs(KERNEL_DS);
 298         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 299         set_fs(old_fs);
 300         return ret;
 301 }
 302
 303 #ifdef COMPAT_RLIM_OLD_INFINITY
 304
 305 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 306                 struct compat_rlimit __user *rlim)
 307 {
 308         struct rlimit r;
 309         int ret;
 310         mm_segment_t old_fs = get_fs();
 311
 312         set_fs(KERNEL_DS);
 313         ret = sys_old_getrlimit(resource, &r);
 314         set_fs(old_fs);
 315
 316         if (!ret) {
 317                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 318                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 319                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 320                         r.rlim_max = COMPAT_RLIM_INFINITY;
 321
 322                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 323                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 324                     __put_user(r.rlim_max, &rlim->rlim_max))
 325                         return -EFAULT;
 326         }
 327         return ret;
 328 }
 329
 330 #endif
 331
 332 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 333                 struct compat_rlimit __user *rlim)
 334 {
 335         struct rlimit r;
 336         int ret;
 337         mm_segment_t old_fs = get_fs();
 338
 339         set_fs(KERNEL_DS);
 340         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 341         set_fs(old_fs);
 342         if (!ret) {
 343                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 344                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 345                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 346                         r.rlim_max = COMPAT_RLIM_INFINITY;
 347
 348                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 349                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 350                     __put_user(r.rlim_max, &rlim->rlim_max))
 351                         return -EFAULT;
 352         }
 353         return ret;
 354 }
 355
 356 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 357 {
 358         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 359             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 360             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 361             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 362             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 363             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 364             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 365             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 366             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 367             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 368             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 369             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 370             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 371             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 372             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 373             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 374             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 375             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 376             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 377                 return -EFAULT;
 378         return 0;
 379 }
 380
 381 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 382 {
 383         struct rusage r;
 384         int ret;
 385         mm_segment_t old_fs = get_fs();
 386
 387         set_fs(KERNEL_DS);
 388         ret = sys_getrusage(who, (struct rusage __user *) &r);
 389         set_fs(old_fs);
 390
 391         if (ret)
 392                 return ret;
 393
 394         if (put_compat_rusage(&r, ru))
 395                 return -EFAULT;
 396
 397         return 0;
 398 }
 399
 400 asmlinkage long
 401 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 402         struct compat_rusage __user *ru)
 403 {
 404         if (!ru) {
 405                 return sys_wait4(pid, stat_addr, options, NULL);
 406         } else {
 407                 struct rusage r;
 408                 int ret;
 409                 unsigned int status;
 410                 mm_segment_t old_fs = get_fs();
 411
 412                 set_fs (KERNEL_DS);
 413                 ret = sys_wait4(pid,
 414                                 (stat_addr ?
 415                                  (unsigned int __user *) &status : NULL),
 416                                 options, (struct rusage __user *) &r);
 417                 set_fs (old_fs);
 418
 419                 if (ret > 0) {
 420                         if (put_compat_rusage(&r, ru))
 421                                 return -EFAULT;
 422                         if (stat_addr && put_user(status, stat_addr))
 423                                 return -EFAULT;
 424                 }
 425                 return ret;
 426         }
 427 }
 428
 429 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 430                 struct compat_siginfo __user *uinfo, int options,
 431                 struct compat_rusage __user *uru)
 432 {
 433         siginfo_t info;
 434         struct rusage ru;
 435         long ret;
 436         mm_segment_t old_fs = get_fs();
 437
 438         memset(&info, 0, sizeof(info));
 439
 440         set_fs(KERNEL_DS);
 441         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 442                          uru ? (struct rusage __user *)&ru : NULL);
 443         set_fs(old_fs);
 444
 445         if ((ret < 0) || (info.si_signo == 0))
 446                 return ret;
 447
 448         if (uru) {
 449                 ret = put_compat_rusage(&ru, uru);
 450                 if (ret)
 451                         return ret;
 452         }
 453
 454         BUG_ON(info.si_code & __SI_MASK);
 455         info.si_code |= __SI_CHLD;
 456         return copy_siginfo_to_user32(uinfo, &info);
 457 }
 458
 459 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 460                                     unsigned len, struct cpumask *new_mask)
 461 {
 462         unsigned long *k;
 463
 464         if (len < cpumask_size())
 465                 memset(new_mask, 0, cpumask_size());
 466         else if (len > cpumask_size())
 467                 len = cpumask_size();
 468
 469         k = cpumask_bits(new_mask);
 470         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 471 }
 472
 473 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 474                                              unsigned int len,
 475                                              compat_ulong_t __user *user_mask_ptr)
 476 {
 477         cpumask_var_t new_mask;
 478         int retval;
 479
 480         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 481                 return -ENOMEM;
 482
 483         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 484         if (retval)
 485                 goto out;
 486
 487         retval = sched_setaffinity(pid, new_mask);
 488 out:
 489         free_cpumask_var(new_mask);
 490         return retval;
 491 }
 492
 493 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 494                                              compat_ulong_t __user *user_mask_ptr)
 495 {
 496         int ret;
 497         cpumask_var_t mask;
 498
 499         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 500                 return -EINVAL;
 501         if (len & (sizeof(compat_ulong_t)-1))
 502                 return -EINVAL;
 503
 504         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 505                 return -ENOMEM;
 506
 507         ret = sched_getaffinity(pid, mask);
 508         if (ret == 0) {
 509                 size_t retlen = min_t(size_t, len, cpumask_size());
 510
 511                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 512                         ret = -EFAULT;
 513                 else
 514                         ret = retlen;
 515         }
 516         free_cpumask_var(mask);
 517
 518         return ret;
 519 }
 520
 521 int get_compat_itimerspec(struct itimerspec *dst,
 522                           const struct compat_itimerspec __user *src)
 523 {
 524         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 525             get_compat_timespec(&dst->it_value, &src->it_value))
 526                 return -EFAULT;
 527         return 0;
 528 }
 529
 530 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 531                           const struct itimerspec *src)
 532 {
 533         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 534             put_compat_timespec(&src->it_value, &dst->it_value))
 535                 return -EFAULT;
 536         return 0;
 537 }
 538
 539 long compat_sys_timer_create(clockid_t which_clock,
 540                         struct compat_sigevent __user *timer_event_spec,
 541                         timer_t __user *created_timer_id)
 542 {
 543         struct sigevent __user *event = NULL;
 544
 545         if (timer_event_spec) {
 546                 struct sigevent kevent;
 547
 548                 event = compat_alloc_user_space(sizeof(*event));
 549                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 550                     copy_to_user(event, &kevent, sizeof(*event)))
 551                         return -EFAULT;
 552         }
 553
 554         return sys_timer_create(which_clock, event, created_timer_id);
 555 }
 556
 557 long compat_sys_timer_settime(timer_t timer_id, int flags,
 558                           struct compat_itimerspec __user *new,
 559                           struct compat_itimerspec __user *old)
 560 {
 561         long err;
 562         mm_segment_t oldfs;
 563         struct itimerspec newts, oldts;
 564
 565         if (!new)
 566                 return -EINVAL;
 567         if (get_compat_itimerspec(&newts, new))
 568                 return -EFAULT;
 569         oldfs = get_fs();
 570         set_fs(KERNEL_DS);
 571         err = sys_timer_settime(timer_id, flags,
 572                                 (struct itimerspec __user *) &newts,
 573                                 (struct itimerspec __user *) &oldts);
 574         set_fs(oldfs);
 575         if (!err && old && put_compat_itimerspec(old, &oldts))
 576                 return -EFAULT;
 577         return err;
 578 }
 579
 580 long compat_sys_timer_gettime(timer_t timer_id,
 581                 struct compat_itimerspec __user *setting)
 582 {
 583         long err;
 584         mm_segment_t oldfs;
 585         struct itimerspec ts;
 586
 587         oldfs = get_fs();
 588         set_fs(KERNEL_DS);
 589         err = sys_timer_gettime(timer_id,
 590                                 (struct itimerspec __user *) &ts);
 591         set_fs(oldfs);
 592         if (!err && put_compat_itimerspec(setting, &ts))
 593                 return -EFAULT;
 594         return err;
 595 }
 596
 597 long compat_sys_clock_settime(clockid_t which_clock,
 598                 struct compat_timespec __user *tp)
 599 {
 600         long err;
 601         mm_segment_t oldfs;
 602         struct timespec ts;
 603
 604         if (get_compat_timespec(&ts, tp))
 605                 return -EFAULT;
 606         oldfs = get_fs();
 607         set_fs(KERNEL_DS);
 608         err = sys_clock_settime(which_clock,
 609                                 (struct timespec __user *) &ts);
 610         set_fs(oldfs);
 611         return err;
 612 }
 613
 614 long compat_sys_clock_gettime(clockid_t which_clock,
 615                 struct compat_timespec __user *tp)
 616 {
 617         long err;
 618         mm_segment_t oldfs;
 619         struct timespec ts;
 620
 621         oldfs = get_fs();
 622         set_fs(KERNEL_DS);
 623         err = sys_clock_gettime(which_clock,
 624                                 (struct timespec __user *) &ts);
 625         set_fs(oldfs);
 626         if (!err && put_compat_timespec(&ts, tp))
 627                 return -EFAULT;
 628         return err;
 629 }
 630
 631 long compat_sys_clock_getres(clockid_t which_clock,
 632                 struct compat_timespec __user *tp)
 633 {
 634         long err;
 635         mm_segment_t oldfs;
 636         struct timespec ts;
 637
 638         oldfs = get_fs();
 639         set_fs(KERNEL_DS);
 640         err = sys_clock_getres(which_clock,
 641                                (struct timespec __user *) &ts);
 642         set_fs(oldfs);
 643         if (!err && tp && put_compat_timespec(&ts, tp))
 644                 return -EFAULT;
 645         return err;
 646 }
 647
 648 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 649 {
 650         long err;
 651         mm_segment_t oldfs;
 652         struct timespec tu;
 653         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 654
 655         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 656         oldfs = get_fs();
 657         set_fs(KERNEL_DS);
 658         err = clock_nanosleep_restart(restart);
 659         set_fs(oldfs);
 660
 661         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 662             put_compat_timespec(&tu, rmtp))
 663                 return -EFAULT;
 664
 665         if (err == -ERESTART_RESTARTBLOCK) {
 666                 restart->fn = compat_clock_nanosleep_restart;
 667                 restart->nanosleep.compat_rmtp = rmtp;
 668         }
 669         return err;
 670 }
 671
 672 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 673                             struct compat_timespec __user *rqtp,
 674                             struct compat_timespec __user *rmtp)
 675 {
 676         long err;
 677         mm_segment_t oldfs;
 678         struct timespec in, out;
 679         struct restart_block *restart;
 680
 681         if (get_compat_timespec(&in, rqtp))
 682                 return -EFAULT;
 683
 684         oldfs = get_fs();
 685         set_fs(KERNEL_DS);
 686         err = sys_clock_nanosleep(which_clock, flags,
 687                                   (struct timespec __user *) &in,
 688                                   (struct timespec __user *) &out);
 689         set_fs(oldfs);
 690
 691         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 692             put_compat_timespec(&out, rmtp))
 693                 return -EFAULT;
 694
 695         if (err == -ERESTART_RESTARTBLOCK) {
 696                 restart = &current_thread_info()->restart_block;
 697                 restart->fn = compat_clock_nanosleep_restart;
 698                 restart->nanosleep.compat_rmtp = rmtp;
 699         }
 700         return err;
 701 }
 702
 703 /*
 704  * We currently only need the following fields from the sigevent
 705  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 706  * sigev_notify_thread_id).  The others are handled in user mode.
 707  * We also assume that copying sigev_value.sival_int is sufficient
 708  * to keep all the bits of sigev_value.sival_ptr intact.
 709  */
 710 int get_compat_sigevent(struct sigevent *event,
 711                 const struct compat_sigevent __user *u_event)
 712 {
 713         memset(event, 0, sizeof(*event));
 714         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 715                 __get_user(event->sigev_value.sival_int,
 716                         &u_event->sigev_value.sival_int) ||
 717                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 718                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 719                 __get_user(event->sigev_notify_thread_id,
 720                         &u_event->sigev_notify_thread_id))
 721                 ? -EFAULT : 0;
 722 }
 723
 724 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 725                        unsigned long bitmap_size)
 726 {
 727         int i, j;
 728         unsigned long m;
 729         compat_ulong_t um;
 730         unsigned long nr_compat_longs;
 731
 732         /* align bitmap up to nearest compat_long_t boundary */
 733         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 734
 735         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 736                 return -EFAULT;
 737
 738         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 739
 740         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 741                 m = 0;
 742
 743                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 744                         /*
 745                          * We dont want to read past the end of the userspace
 746                          * bitmap. We must however ensure the end of the
 747                          * kernel bitmap is zeroed.
 748                          */
 749                         if (nr_compat_longs-- > 0) {
 750                                 if (__get_user(um, umask))
 751                                         return -EFAULT;
 752                         } else {
 753                                 um = 0;
 754                         }
 755
 756                         umask++;
 757                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 758                 }
 759                 *mask++ = m;
 760         }
 761
 762         return 0;
 763 }
 764
 765 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 766                        unsigned long bitmap_size)
 767 {
 768         int i, j;
 769         unsigned long m;
 770         compat_ulong_t um;
 771         unsigned long nr_compat_longs;
 772
 773         /* align bitmap up to nearest compat_long_t boundary */
 774         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 775
 776         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 777                 return -EFAULT;
 778
 779         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 780
 781         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 782                 m = *mask++;
 783
 784                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 785                         um = m;
 786
 787                         /*
 788                          * We dont want to write past the end of the userspace
 789                          * bitmap.
 790                          */
 791                         if (nr_compat_longs-- > 0) {
 792                                 if (__put_user(um, umask))
 793                                         return -EFAULT;
 794                         }
 795
 796                         umask++;
 797                         m >>= 4*sizeof(um);
 798                         m >>= 4*sizeof(um);
 799                 }
 800         }
 801
 802         return 0;
 803 }
 804
 805 void
 806 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 807 {
 808         switch (_NSIG_WORDS) {
 809         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 810         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 811         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 812         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 813         }
 814 }
 815
 816 asmlinkage long
 817 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 818                 struct compat_siginfo __user *uinfo,
 819                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 820 {
 821         compat_sigset_t s32;
 822         sigset_t s;
 823         int sig;
 824         struct timespec t;
 825         siginfo_t info;
 826         long ret, timeout = 0;
 827
 828         if (sigsetsize != sizeof(sigset_t))
 829                 return -EINVAL;
 830
 831         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 832                 return -EFAULT;
 833         sigset_from_compat(&s, &s32);
 834         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 835         signotset(&s);
 836
 837         if (uts) {
 838                 if (get_compat_timespec (&t, uts))
 839                         return -EFAULT;
 840                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 841                                 || t.tv_sec < 0)
 842                         return -EINVAL;
 843         }
 844
 845         spin_lock_irq(&current->sighand->siglock);
 846         sig = dequeue_signal(current, &s, &info);
 847         if (!sig) {
 848                 timeout = MAX_SCHEDULE_TIMEOUT;
 849                 if (uts)
 850                         timeout = timespec_to_jiffies(&t)
 851                                 +(t.tv_sec || t.tv_nsec);
 852                 if (timeout) {
 853                         current->real_blocked = current->blocked;
 854                         sigandsets(&current->blocked, &current->blocked, &s);
 855
 856                         recalc_sigpending();
 857                         spin_unlock_irq(&current->sighand->siglock);
 858
 859                         timeout = schedule_timeout_interruptible(timeout);
 860
 861                         spin_lock_irq(&current->sighand->siglock);
 862                         sig = dequeue_signal(current, &s, &info);
 863                         current->blocked = current->real_blocked;
 864                         siginitset(&current->real_blocked, 0);
 865                         recalc_sigpending();
 866                 }
 867         }
 868         spin_unlock_irq(&current->sighand->siglock);
 869
 870         if (sig) {
 871                 ret = sig;
 872                 if (uinfo) {
 873                         if (copy_siginfo_to_user32(uinfo, &info))
 874                                 ret = -EFAULT;
 875                 }
 876         }else {
 877                 ret = timeout?-EINTR:-EAGAIN;
 878         }
 879         return ret;
 880
 881 }
 882
 883 asmlinkage long
 884 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 885                              struct compat_siginfo __user *uinfo)
 886 {
 887         siginfo_t info;
 888
 889         if (copy_siginfo_from_user32(&info, uinfo))
 890                 return -EFAULT;
 891         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 892 }
 893
 894 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 895
 896 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 897
 898 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 899 {
 900         compat_time_t i;
 901         struct timeval tv;
 902
 903         do_gettimeofday(&tv);
 904         i = tv.tv_sec;
 905
 906         if (tloc) {
 907                 if (put_user(i,tloc))
 908                         return -EFAULT;
 909         }
 910         force_successful_syscall_return();
 911         return i;
 912 }
 913
 914 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 915 {
 916         struct timespec tv;
 917         int err;
 918
 919         if (get_user(tv.tv_sec, tptr))
 920                 return -EFAULT;
 921
 922         tv.tv_nsec = 0;
 923
 924         err = security_settime(&tv, NULL);
 925         if (err)
 926                 return err;
 927
 928         do_settimeofday(&tv);
 929         return 0;
 930 }
 931
 932 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 933
 934 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 935 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 936 {
 937         sigset_t newset;
 938         compat_sigset_t newset32;
 939
 940         /* XXX: Don't preclude handling different sized sigset_t's.  */
 941         if (sigsetsize != sizeof(sigset_t))
 942                 return -EINVAL;
 943
 944         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 945                 return -EFAULT;
 946         sigset_from_compat(&newset, &newset32);
 947         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 948
 949         spin_lock_irq(&current->sighand->siglock);
 950         current->saved_sigmask = current->blocked;
 951         current->blocked = newset;
 952         recalc_sigpending();
 953         spin_unlock_irq(&current->sighand->siglock);
 954
 955         current->state = TASK_INTERRUPTIBLE;
 956         schedule();
 957         set_restore_sigmask();
 958         return -ERESTARTNOHAND;
 959 }
 960 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 961
 962 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 963 {
 964         struct timex txc;
 965         int ret;
 966
 967         memset(&txc, 0, sizeof(struct timex));
 968
 969         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 970                         __get_user(txc.modes, &utp->modes) ||
 971                         __get_user(txc.offset, &utp->offset) ||
 972                         __get_user(txc.freq, &utp->freq) ||
 973                         __get_user(txc.maxerror, &utp->maxerror) ||
 974                         __get_user(txc.esterror, &utp->esterror) ||
 975                         __get_user(txc.status, &utp->status) ||
 976                         __get_user(txc.constant, &utp->constant) ||
 977                         __get_user(txc.precision, &utp->precision) ||
 978                         __get_user(txc.tolerance, &utp->tolerance) ||
 979                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 980                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 981                         __get_user(txc.tick, &utp->tick) ||
 982                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 983                         __get_user(txc.jitter, &utp->jitter) ||
 984                         __get_user(txc.shift, &utp->shift) ||
 985                         __get_user(txc.stabil, &utp->stabil) ||
 986                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 987                         __get_user(txc.calcnt, &utp->calcnt) ||
 988                         __get_user(txc.errcnt, &utp->errcnt) ||
 989                         __get_user(txc.stbcnt, &utp->stbcnt))
 990                 return -EFAULT;
 991
 992         ret = do_adjtimex(&txc);
 993
 994         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 995                         __put_user(txc.modes, &utp->modes) ||
 996                         __put_user(txc.offset, &utp->offset) ||
 997                         __put_user(txc.freq, &utp->freq) ||
 998                         __put_user(txc.maxerror, &utp->maxerror) ||
 999                         __put_user(txc.esterror, &utp->esterror) ||
1000                         __put_user(txc.status, &utp->status) ||
1001                         __put_user(txc.constant, &utp->constant) ||
1002                         __put_user(txc.precision, &utp->precision) ||
1003                         __put_user(txc.tolerance, &utp->tolerance) ||
1004                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1005                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1006                         __put_user(txc.tick, &utp->tick) ||
1007                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1008                         __put_user(txc.jitter, &utp->jitter) ||
1009                         __put_user(txc.shift, &utp->shift) ||
1010                         __put_user(txc.stabil, &utp->stabil) ||
1011                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1012                         __put_user(txc.calcnt, &utp->calcnt) ||
1013                         __put_user(txc.errcnt, &utp->errcnt) ||
1014                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1015                         __put_user(txc.tai, &utp->tai))
1016                 ret = -EFAULT;
1017
1018         return ret;
1019 }
1020
1021 #ifdef CONFIG_NUMA
1022 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1023                 compat_uptr_t __user *pages32,
1024                 const int __user *nodes,
1025                 int __user *status,
1026                 int flags)
1027 {
1028         const void __user * __user *pages;
1029         int i;
1030
1031         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1032         for (i = 0; i < nr_pages; i++) {
1033                 compat_uptr_t p;
1034
1035                 if (get_user(p, pages32 + i) ||
1036                         put_user(compat_ptr(p), pages + i))
1037                         return -EFAULT;
1038         }
1039         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1040 }
1041
1042 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1043                         compat_ulong_t maxnode,
1044                         const compat_ulong_t __user *old_nodes,
1045                         const compat_ulong_t __user *new_nodes)
1046 {
1047         unsigned long __user *old = NULL;
1048         unsigned long __user *new = NULL;
1049         nodemask_t tmp_mask;
1050         unsigned long nr_bits;
1051         unsigned long size;
1052
1053         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1054         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1055         if (old_nodes) {
1056                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1057                         return -EFAULT;
1058                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1059                 if (new_nodes)
1060                         new = old + size / sizeof(unsigned long);
1061                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1062                         return -EFAULT;
1063         }
1064         if (new_nodes) {
1065                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1066                         return -EFAULT;
1067                 if (new == NULL)
1068                         new = compat_alloc_user_space(size);
1069                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1070                         return -EFAULT;
1071         }
1072         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1073 }
1074 #endif
1075
1076 struct compat_sysinfo {
1077         s32 uptime;
1078         u32 loads[3];
1079         u32 totalram;
1080         u32 freeram;
1081         u32 sharedram;
1082         u32 bufferram;
1083         u32 totalswap;
1084         u32 freeswap;
1085         u16 procs;
1086         u16 pad;
1087         u32 totalhigh;
1088         u32 freehigh;
1089         u32 mem_unit;
1090         char _f[20-2*sizeof(u32)-sizeof(int)];
1091 };
1092
1093 asmlinkage long
1094 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1095 {
1096         struct sysinfo s;
1097
1098         do_sysinfo(&s);
1099
1100         /* Check to see if any memory value is too large for 32-bit and scale
1101          *  down if needed
1102          */
1103         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1104                 int bitcount = 0;
1105
1106                 while (s.mem_unit < PAGE_SIZE) {
1107                         s.mem_unit <<= 1;
1108                         bitcount++;
1109                 }
1110
1111                 s.totalram >>= bitcount;
1112                 s.freeram >>= bitcount;
1113                 s.sharedram >>= bitcount;
1114                 s.bufferram >>= bitcount;
1115                 s.totalswap >>= bitcount;
1116                 s.freeswap >>= bitcount;
1117                 s.totalhigh >>= bitcount;
1118                 s.freehigh >>= bitcount;
1119         }
1120
1121         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1122             __put_user (s.uptime, &info->uptime) ||
1123             __put_user (s.loads[0], &info->loads[0]) ||
1124             __put_user (s.loads[1], &info->loads[1]) ||
1125             __put_user (s.loads[2], &info->loads[2]) ||
1126             __put_user (s.totalram, &info->totalram) ||
1127             __put_user (s.freeram, &info->freeram) ||
1128             __put_user (s.sharedram, &info->sharedram) ||
1129             __put_user (s.bufferram, &info->bufferram) ||
1130             __put_user (s.totalswap, &info->totalswap) ||
1131             __put_user (s.freeswap, &info->freeswap) ||
1132             __put_user (s.procs, &info->procs) ||
1133             __put_user (s.totalhigh, &info->totalhigh) ||
1134             __put_user (s.freehigh, &info->freehigh) ||
1135             __put_user (s.mem_unit, &info->mem_unit))
1136                 return -EFAULT;
1137
1138         return 0;
1139 }
1140
1141 /*
1142  * Allocate user-space memory for the duration of a single system call,
1143  * in order to marshall parameters inside a compat thunk.
1144  */
1145 void __user *compat_alloc_user_space(unsigned long len)
1146 {
1147         void __user *ptr;
1148
1149         /* If len would occupy more than half of the entire compat space... */
1150         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1151                 return NULL;
1152
1153         ptr = arch_compat_alloc_user_space(len);
1154
1155         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1156                 return NULL;
1157
1158         return ptr;
1159 }
1160 EXPORT_SYMBOL_GPL(compat_alloc_user_space);