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
  28 #include <asm/uaccess.h>
  29
  30 /*
  31  * Note that the native side is already converted to a timespec, because
  32  * that's what we want anyway.
  33  */
  34 static int compat_get_timeval(struct timespec *o,
  35                 struct compat_timeval __user *i)
  36 {
  37         long usec;
  38
  39         if (get_user(o->tv_sec, &i->tv_sec) ||
  40             get_user(usec, &i->tv_usec))
  41                 return -EFAULT;
  42         o->tv_nsec = usec * 1000;
  43         return 0;
  44 }
  45
  46 static int compat_put_timeval(struct compat_timeval __user *o,
  47                 struct timeval *i)
  48 {
  49         return (put_user(i->tv_sec, &o->tv_sec) ||
  50                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  51 }
  52
  53 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
  54                 struct timezone __user *tz)
  55 {
  56         if (tv) {
  57                 struct timeval ktv;
  58                 do_gettimeofday(&ktv);
  59                 if (compat_put_timeval(tv, &ktv))
  60                         return -EFAULT;
  61         }
  62         if (tz) {
  63                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
  64                         return -EFAULT;
  65         }
  66
  67         return 0;
  68 }
  69
  70 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
  71                 struct timezone __user *tz)
  72 {
  73         struct timespec kts;
  74         struct timezone ktz;
  75
  76         if (tv) {
  77                 if (compat_get_timeval(&kts, tv))
  78                         return -EFAULT;
  79         }
  80         if (tz) {
  81                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
  82                         return -EFAULT;
  83         }
  84
  85         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
  86 }
  87
  88 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  89 {
  90         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  91                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  92                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  93 }
  94
  95 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  96 {
  97         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  98                         __put_user(ts->tv_sec, &cts->tv_sec) ||
  99                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 100 }
 101
 102 static long compat_nanosleep_restart(struct restart_block *restart)
 103 {
 104         struct compat_timespec __user *rmtp;
 105         struct timespec rmt;
 106         mm_segment_t oldfs;
 107         long ret;
 108
 109         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 110         oldfs = get_fs();
 111         set_fs(KERNEL_DS);
 112         ret = hrtimer_nanosleep_restart(restart);
 113         set_fs(oldfs);
 114
 115         if (ret) {
 116                 rmtp = restart->nanosleep.compat_rmtp;
 117
 118                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 119                         return -EFAULT;
 120         }
 121
 122         return ret;
 123 }
 124
 125 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 126                                      struct compat_timespec __user *rmtp)
 127 {
 128         struct timespec tu, rmt;
 129         mm_segment_t oldfs;
 130         long ret;
 131
 132         if (get_compat_timespec(&tu, rqtp))
 133                 return -EFAULT;
 134
 135         if (!timespec_valid(&tu))
 136                 return -EINVAL;
 137
 138         oldfs = get_fs();
 139         set_fs(KERNEL_DS);
 140         ret = hrtimer_nanosleep(&tu,
 141                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 142                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 143         set_fs(oldfs);
 144
 145         if (ret) {
 146                 struct restart_block *restart
 147                         = &current_thread_info()->restart_block;
 148
 149                 restart->fn = compat_nanosleep_restart;
 150                 restart->nanosleep.compat_rmtp = rmtp;
 151
 152                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 153                         return -EFAULT;
 154         }
 155
 156         return ret;
 157 }
 158
 159 static inline long get_compat_itimerval(struct itimerval *o,
 160                 struct compat_itimerval __user *i)
 161 {
 162         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 163                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 164                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 165                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 166                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 167 }
 168
 169 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 170                 struct itimerval *i)
 171 {
 172         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 173                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 174                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 175                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 176                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 177 }
 178
 179 asmlinkage long compat_sys_getitimer(int which,
 180                 struct compat_itimerval __user *it)
 181 {
 182         struct itimerval kit;
 183         int error;
 184
 185         error = do_getitimer(which, &kit);
 186         if (!error && put_compat_itimerval(it, &kit))
 187                 error = -EFAULT;
 188         return error;
 189 }
 190
 191 asmlinkage long compat_sys_setitimer(int which,
 192                 struct compat_itimerval __user *in,
 193                 struct compat_itimerval __user *out)
 194 {
 195         struct itimerval kin, kout;
 196         int error;
 197
 198         if (in) {
 199                 if (get_compat_itimerval(&kin, in))
 200                         return -EFAULT;
 201         } else
 202                 memset(&kin, 0, sizeof(kin));
 203
 204         error = do_setitimer(which, &kin, out ? &kout : NULL);
 205         if (error || !out)
 206                 return error;
 207         if (put_compat_itimerval(out, &kout))
 208                 return -EFAULT;
 209         return 0;
 210 }
 211
 212 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 213 {
 214         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 215 }
 216
 217 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 218 {
 219         if (tbuf) {
 220                 struct tms tms;
 221                 struct compat_tms tmp;
 222
 223                 do_sys_times(&tms);
 224                 /* Convert our struct tms to the compat version. */
 225                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 226                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 227                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 228                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 229                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 230                         return -EFAULT;
 231         }
 232         return compat_jiffies_to_clock_t(jiffies);
 233 }
 234
 235 /*
 236  * Assumption: old_sigset_t and compat_old_sigset_t are both
 237  * types that can be passed to put_user()/get_user().
 238  */
 239
 240 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 241 {
 242         old_sigset_t s;
 243         long ret;
 244         mm_segment_t old_fs = get_fs();
 245
 246         set_fs(KERNEL_DS);
 247         ret = sys_sigpending((old_sigset_t __user *) &s);
 248         set_fs(old_fs);
 249         if (ret == 0)
 250                 ret = put_user(s, set);
 251         return ret;
 252 }
 253
 254 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 255                 compat_old_sigset_t __user *oset)
 256 {
 257         old_sigset_t s;
 258         long ret;
 259         mm_segment_t old_fs;
 260
 261         if (set && get_user(s, set))
 262                 return -EFAULT;
 263         old_fs = get_fs();
 264         set_fs(KERNEL_DS);
 265         ret = sys_sigprocmask(how,
 266                               set ? (old_sigset_t __user *) &s : NULL,
 267                               oset ? (old_sigset_t __user *) &s : NULL);
 268         set_fs(old_fs);
 269         if (ret == 0)
 270                 if (oset)
 271                         ret = put_user(s, oset);
 272         return ret;
 273 }
 274
 275 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 276                 struct compat_rlimit __user *rlim)
 277 {
 278         struct rlimit r;
 279         int ret;
 280         mm_segment_t old_fs = get_fs ();
 281
 282         if (resource >= RLIM_NLIMITS)
 283                 return -EINVAL;
 284
 285         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 286             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 287             __get_user(r.rlim_max, &rlim->rlim_max))
 288                 return -EFAULT;
 289
 290         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 291                 r.rlim_cur = RLIM_INFINITY;
 292         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 293                 r.rlim_max = RLIM_INFINITY;
 294         set_fs(KERNEL_DS);
 295         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 296         set_fs(old_fs);
 297         return ret;
 298 }
 299
 300 #ifdef COMPAT_RLIM_OLD_INFINITY
 301
 302 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 303                 struct compat_rlimit __user *rlim)
 304 {
 305         struct rlimit r;
 306         int ret;
 307         mm_segment_t old_fs = get_fs();
 308
 309         set_fs(KERNEL_DS);
 310         ret = sys_old_getrlimit(resource, &r);
 311         set_fs(old_fs);
 312
 313         if (!ret) {
 314                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 315                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 316                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 317                         r.rlim_max = COMPAT_RLIM_INFINITY;
 318
 319                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 320                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 321                     __put_user(r.rlim_max, &rlim->rlim_max))
 322                         return -EFAULT;
 323         }
 324         return ret;
 325 }
 326
 327 #endif
 328
 329 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 330                 struct compat_rlimit __user *rlim)
 331 {
 332         struct rlimit r;
 333         int ret;
 334         mm_segment_t old_fs = get_fs();
 335
 336         set_fs(KERNEL_DS);
 337         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 338         set_fs(old_fs);
 339         if (!ret) {
 340                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 341                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 342                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 343                         r.rlim_max = COMPAT_RLIM_INFINITY;
 344
 345                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 346                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 347                     __put_user(r.rlim_max, &rlim->rlim_max))
 348                         return -EFAULT;
 349         }
 350         return ret;
 351 }
 352
 353 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 354 {
 355         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 356             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 357             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 358             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 359             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 360             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 361             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 362             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 363             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 364             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 365             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 366             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 367             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 368             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 369             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 370             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 371             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 372             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 373             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 374                 return -EFAULT;
 375         return 0;
 376 }
 377
 378 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 379 {
 380         struct rusage r;
 381         int ret;
 382         mm_segment_t old_fs = get_fs();
 383
 384         set_fs(KERNEL_DS);
 385         ret = sys_getrusage(who, (struct rusage __user *) &r);
 386         set_fs(old_fs);
 387
 388         if (ret)
 389                 return ret;
 390
 391         if (put_compat_rusage(&r, ru))
 392                 return -EFAULT;
 393
 394         return 0;
 395 }
 396
 397 asmlinkage long
 398 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 399         struct compat_rusage __user *ru)
 400 {
 401         if (!ru) {
 402                 return sys_wait4(pid, stat_addr, options, NULL);
 403         } else {
 404                 struct rusage r;
 405                 int ret;
 406                 unsigned int status;
 407                 mm_segment_t old_fs = get_fs();
 408
 409                 set_fs (KERNEL_DS);
 410                 ret = sys_wait4(pid,
 411                                 (stat_addr ?
 412                                  (unsigned int __user *) &status : NULL),
 413                                 options, (struct rusage __user *) &r);
 414                 set_fs (old_fs);
 415
 416                 if (ret > 0) {
 417                         if (put_compat_rusage(&r, ru))
 418                                 return -EFAULT;
 419                         if (stat_addr && put_user(status, stat_addr))
 420                                 return -EFAULT;
 421                 }
 422                 return ret;
 423         }
 424 }
 425
 426 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 427                 struct compat_siginfo __user *uinfo, int options,
 428                 struct compat_rusage __user *uru)
 429 {
 430         siginfo_t info;
 431         struct rusage ru;
 432         long ret;
 433         mm_segment_t old_fs = get_fs();
 434
 435         memset(&info, 0, sizeof(info));
 436
 437         set_fs(KERNEL_DS);
 438         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 439                          uru ? (struct rusage __user *)&ru : NULL);
 440         set_fs(old_fs);
 441
 442         if ((ret < 0) || (info.si_signo == 0))
 443                 return ret;
 444
 445         if (uru) {
 446                 ret = put_compat_rusage(&ru, uru);
 447                 if (ret)
 448                         return ret;
 449         }
 450
 451         BUG_ON(info.si_code & __SI_MASK);
 452         info.si_code |= __SI_CHLD;
 453         return copy_siginfo_to_user32(uinfo, &info);
 454 }
 455
 456 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 457                                     unsigned len, struct cpumask *new_mask)
 458 {
 459         unsigned long *k;
 460
 461         if (len < cpumask_size())
 462                 memset(new_mask, 0, cpumask_size());
 463         else if (len > cpumask_size())
 464                 len = cpumask_size();
 465
 466         k = cpumask_bits(new_mask);
 467         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 468 }
 469
 470 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 471                                              unsigned int len,
 472                                              compat_ulong_t __user *user_mask_ptr)
 473 {
 474         cpumask_var_t new_mask;
 475         int retval;
 476
 477         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 478                 return -ENOMEM;
 479
 480         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 481         if (retval)
 482                 goto out;
 483
 484         retval = sched_setaffinity(pid, new_mask);
 485 out:
 486         free_cpumask_var(new_mask);
 487         return retval;
 488 }
 489
 490 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 491                                              compat_ulong_t __user *user_mask_ptr)
 492 {
 493         int ret;
 494         cpumask_var_t mask;
 495         unsigned long *k;
 496         unsigned int min_length = cpumask_size();
 497
 498         if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
 499                 min_length = sizeof(compat_ulong_t);
 500
 501         if (len < min_length)
 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                 goto out;
 510
 511         k = cpumask_bits(mask);
 512         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 513         if (ret == 0)
 514                 ret = min_length;
 515
 516 out:
 517         free_cpumask_var(mask);
 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 #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                         i = -EFAULT;
 898         }
 899         return i;
 900 }
 901
 902 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 903 {
 904         struct timespec tv;
 905         int err;
 906
 907         if (get_user(tv.tv_sec, tptr))
 908                 return -EFAULT;
 909
 910         tv.tv_nsec = 0;
 911
 912         err = security_settime(&tv, NULL);
 913         if (err)
 914                 return err;
 915
 916         do_settimeofday(&tv);
 917         return 0;
 918 }
 919
 920 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 921
 922 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 923 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 924 {
 925         sigset_t newset;
 926         compat_sigset_t newset32;
 927
 928         /* XXX: Don't preclude handling different sized sigset_t's.  */
 929         if (sigsetsize != sizeof(sigset_t))
 930                 return -EINVAL;
 931
 932         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 933                 return -EFAULT;
 934         sigset_from_compat(&newset, &newset32);
 935         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 936
 937         spin_lock_irq(&current->sighand->siglock);
 938         current->saved_sigmask = current->blocked;
 939         current->blocked = newset;
 940         recalc_sigpending();
 941         spin_unlock_irq(&current->sighand->siglock);
 942
 943         current->state = TASK_INTERRUPTIBLE;
 944         schedule();
 945         set_restore_sigmask();
 946         return -ERESTARTNOHAND;
 947 }
 948 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 949
 950 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 951 {
 952         struct timex txc;
 953         int ret;
 954
 955         memset(&txc, 0, sizeof(struct timex));
 956
 957         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 958                         __get_user(txc.modes, &utp->modes) ||
 959                         __get_user(txc.offset, &utp->offset) ||
 960                         __get_user(txc.freq, &utp->freq) ||
 961                         __get_user(txc.maxerror, &utp->maxerror) ||
 962                         __get_user(txc.esterror, &utp->esterror) ||
 963                         __get_user(txc.status, &utp->status) ||
 964                         __get_user(txc.constant, &utp->constant) ||
 965                         __get_user(txc.precision, &utp->precision) ||
 966                         __get_user(txc.tolerance, &utp->tolerance) ||
 967                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 968                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 969                         __get_user(txc.tick, &utp->tick) ||
 970                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 971                         __get_user(txc.jitter, &utp->jitter) ||
 972                         __get_user(txc.shift, &utp->shift) ||
 973                         __get_user(txc.stabil, &utp->stabil) ||
 974                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 975                         __get_user(txc.calcnt, &utp->calcnt) ||
 976                         __get_user(txc.errcnt, &utp->errcnt) ||
 977                         __get_user(txc.stbcnt, &utp->stbcnt))
 978                 return -EFAULT;
 979
 980         ret = do_adjtimex(&txc);
 981
 982         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 983                         __put_user(txc.modes, &utp->modes) ||
 984                         __put_user(txc.offset, &utp->offset) ||
 985                         __put_user(txc.freq, &utp->freq) ||
 986                         __put_user(txc.maxerror, &utp->maxerror) ||
 987                         __put_user(txc.esterror, &utp->esterror) ||
 988                         __put_user(txc.status, &utp->status) ||
 989                         __put_user(txc.constant, &utp->constant) ||
 990                         __put_user(txc.precision, &utp->precision) ||
 991                         __put_user(txc.tolerance, &utp->tolerance) ||
 992                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 993                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 994                         __put_user(txc.tick, &utp->tick) ||
 995                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
 996                         __put_user(txc.jitter, &utp->jitter) ||
 997                         __put_user(txc.shift, &utp->shift) ||
 998                         __put_user(txc.stabil, &utp->stabil) ||
 999                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1000                         __put_user(txc.calcnt, &utp->calcnt) ||
1001                         __put_user(txc.errcnt, &utp->errcnt) ||
1002                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1003                         __put_user(txc.tai, &utp->tai))
1004                 ret = -EFAULT;
1005
1006         return ret;
1007 }
1008
1009 #ifdef CONFIG_NUMA
1010 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1011                 compat_uptr_t __user *pages32,
1012                 const int __user *nodes,
1013                 int __user *status,
1014                 int flags)
1015 {
1016         const void __user * __user *pages;
1017         int i;
1018
1019         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1020         for (i = 0; i < nr_pages; i++) {
1021                 compat_uptr_t p;
1022
1023                 if (get_user(p, pages32 + i) ||
1024                         put_user(compat_ptr(p), pages + i))
1025                         return -EFAULT;
1026         }
1027         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1028 }
1029
1030 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1031                         compat_ulong_t maxnode,
1032                         const compat_ulong_t __user *old_nodes,
1033                         const compat_ulong_t __user *new_nodes)
1034 {
1035         unsigned long __user *old = NULL;
1036         unsigned long __user *new = NULL;
1037         nodemask_t tmp_mask;
1038         unsigned long nr_bits;
1039         unsigned long size;
1040
1041         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1042         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1043         if (old_nodes) {
1044                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1045                         return -EFAULT;
1046                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1047                 if (new_nodes)
1048                         new = old + size / sizeof(unsigned long);
1049                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1050                         return -EFAULT;
1051         }
1052         if (new_nodes) {
1053                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1054                         return -EFAULT;
1055                 if (new == NULL)
1056                         new = compat_alloc_user_space(size);
1057                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1058                         return -EFAULT;
1059         }
1060         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1061 }
1062 #endif
1063
1064 struct compat_sysinfo {
1065         s32 uptime;
1066         u32 loads[3];
1067         u32 totalram;
1068         u32 freeram;
1069         u32 sharedram;
1070         u32 bufferram;
1071         u32 totalswap;
1072         u32 freeswap;
1073         u16 procs;
1074         u16 pad;
1075         u32 totalhigh;
1076         u32 freehigh;
1077         u32 mem_unit;
1078         char _f[20-2*sizeof(u32)-sizeof(int)];
1079 };
1080
1081 asmlinkage long
1082 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1083 {
1084         struct sysinfo s;
1085
1086         do_sysinfo(&s);
1087
1088         /* Check to see if any memory value is too large for 32-bit and scale
1089          *  down if needed
1090          */
1091         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1092                 int bitcount = 0;
1093
1094                 while (s.mem_unit < PAGE_SIZE) {
1095                         s.mem_unit <<= 1;
1096                         bitcount++;
1097                 }
1098
1099                 s.totalram >>= bitcount;
1100                 s.freeram >>= bitcount;
1101                 s.sharedram >>= bitcount;
1102                 s.bufferram >>= bitcount;
1103                 s.totalswap >>= bitcount;
1104                 s.freeswap >>= bitcount;
1105                 s.totalhigh >>= bitcount;
1106                 s.freehigh >>= bitcount;
1107         }
1108
1109         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1110             __put_user (s.uptime, &info->uptime) ||
1111             __put_user (s.loads[0], &info->loads[0]) ||
1112             __put_user (s.loads[1], &info->loads[1]) ||
1113             __put_user (s.loads[2], &info->loads[2]) ||
1114             __put_user (s.totalram, &info->totalram) ||
1115             __put_user (s.freeram, &info->freeram) ||
1116             __put_user (s.sharedram, &info->sharedram) ||
1117             __put_user (s.bufferram, &info->bufferram) ||
1118             __put_user (s.totalswap, &info->totalswap) ||
1119             __put_user (s.freeswap, &info->freeswap) ||
1120             __put_user (s.procs, &info->procs) ||
1121             __put_user (s.totalhigh, &info->totalhigh) ||
1122             __put_user (s.freehigh, &info->freehigh) ||
1123             __put_user (s.mem_unit, &info->mem_unit))
1124                 return -EFAULT;
1125
1126         return 0;
1127 }