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/export.h>
  25 #include <linux/migrate.h>
  26 #include <linux/posix-timers.h>
  27 #include <linux/times.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/gfp.h>
  30
  31 #include <asm/uaccess.h>
  32
  33 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  34 {
  35         memset(txc, 0, sizeof(struct timex));
  36
  37         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  38                         __get_user(txc->modes, &utp->modes) ||
  39                         __get_user(txc->offset, &utp->offset) ||
  40                         __get_user(txc->freq, &utp->freq) ||
  41                         __get_user(txc->maxerror, &utp->maxerror) ||
  42                         __get_user(txc->esterror, &utp->esterror) ||
  43                         __get_user(txc->status, &utp->status) ||
  44                         __get_user(txc->constant, &utp->constant) ||
  45                         __get_user(txc->precision, &utp->precision) ||
  46                         __get_user(txc->tolerance, &utp->tolerance) ||
  47                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  48                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  49                         __get_user(txc->tick, &utp->tick) ||
  50                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  51                         __get_user(txc->jitter, &utp->jitter) ||
  52                         __get_user(txc->shift, &utp->shift) ||
  53                         __get_user(txc->stabil, &utp->stabil) ||
  54                         __get_user(txc->jitcnt, &utp->jitcnt) ||
  55                         __get_user(txc->calcnt, &utp->calcnt) ||
  56                         __get_user(txc->errcnt, &utp->errcnt) ||
  57                         __get_user(txc->stbcnt, &utp->stbcnt))
  58                 return -EFAULT;
  59
  60         return 0;
  61 }
  62
  63 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  64 {
  65         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  66                         __put_user(txc->modes, &utp->modes) ||
  67                         __put_user(txc->offset, &utp->offset) ||
  68                         __put_user(txc->freq, &utp->freq) ||
  69                         __put_user(txc->maxerror, &utp->maxerror) ||
  70                         __put_user(txc->esterror, &utp->esterror) ||
  71                         __put_user(txc->status, &utp->status) ||
  72                         __put_user(txc->constant, &utp->constant) ||
  73                         __put_user(txc->precision, &utp->precision) ||
  74                         __put_user(txc->tolerance, &utp->tolerance) ||
  75                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  76                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  77                         __put_user(txc->tick, &utp->tick) ||
  78                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
  79                         __put_user(txc->jitter, &utp->jitter) ||
  80                         __put_user(txc->shift, &utp->shift) ||
  81                         __put_user(txc->stabil, &utp->stabil) ||
  82                         __put_user(txc->jitcnt, &utp->jitcnt) ||
  83                         __put_user(txc->calcnt, &utp->calcnt) ||
  84                         __put_user(txc->errcnt, &utp->errcnt) ||
  85                         __put_user(txc->stbcnt, &utp->stbcnt) ||
  86                         __put_user(txc->tai, &utp->tai))
  87                 return -EFAULT;
  88         return 0;
  89 }
  90
  91 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
  92                        struct timezone __user *, tz)
  93 {
  94         if (tv) {
  95                 struct timeval ktv;
  96                 do_gettimeofday(&ktv);
  97                 if (compat_put_timeval(&ktv, tv))
  98                         return -EFAULT;
  99         }
 100         if (tz) {
 101                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 102                         return -EFAULT;
 103         }
 104
 105         return 0;
 106 }
 107
 108 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
 109                        struct timezone __user *, tz)
 110 {
 111         struct timeval user_tv;
 112         struct timespec new_ts;
 113         struct timezone new_tz;
 114
 115         if (tv) {
 116                 if (compat_get_timeval(&user_tv, tv))
 117                         return -EFAULT;
 118                 new_ts.tv_sec = user_tv.tv_sec;
 119                 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
 120         }
 121         if (tz) {
 122                 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
 123                         return -EFAULT;
 124         }
 125
 126         return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
 127 }
 128
 129 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
 130 {
 131         return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
 132                         __get_user(tv->tv_sec, &ctv->tv_sec) ||
 133                         __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 134 }
 135
 136 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
 137 {
 138         return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
 139                         __put_user(tv->tv_sec, &ctv->tv_sec) ||
 140                         __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 141 }
 142
 143 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 144 {
 145         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 146                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 147                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 148 }
 149
 150 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 151 {
 152         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 153                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 154                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 155 }
 156
 157 int compat_get_timeval(struct timeval *tv, const void __user *utv)
 158 {
 159         if (COMPAT_USE_64BIT_TIME)
 160                 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
 161         else
 162                 return __compat_get_timeval(tv, utv);
 163 }
 164 EXPORT_SYMBOL_GPL(compat_get_timeval);
 165
 166 int compat_put_timeval(const struct timeval *tv, void __user *utv)
 167 {
 168         if (COMPAT_USE_64BIT_TIME)
 169                 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
 170         else
 171                 return __compat_put_timeval(tv, utv);
 172 }
 173 EXPORT_SYMBOL_GPL(compat_put_timeval);
 174
 175 int compat_get_timespec(struct timespec *ts, const void __user *uts)
 176 {
 177         if (COMPAT_USE_64BIT_TIME)
 178                 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
 179         else
 180                 return __compat_get_timespec(ts, uts);
 181 }
 182 EXPORT_SYMBOL_GPL(compat_get_timespec);
 183
 184 int compat_put_timespec(const struct timespec *ts, void __user *uts)
 185 {
 186         if (COMPAT_USE_64BIT_TIME)
 187                 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
 188         else
 189                 return __compat_put_timespec(ts, uts);
 190 }
 191 EXPORT_SYMBOL_GPL(compat_put_timespec);
 192
 193 int compat_convert_timespec(struct timespec __user **kts,
 194                             const void __user *cts)
 195 {
 196         struct timespec ts;
 197         struct timespec __user *uts;
 198
 199         if (!cts || COMPAT_USE_64BIT_TIME) {
 200                 *kts = (struct timespec __user *)cts;
 201                 return 0;
 202         }
 203
 204         uts = compat_alloc_user_space(sizeof(ts));
 205         if (!uts)
 206                 return -EFAULT;
 207         if (compat_get_timespec(&ts, cts))
 208                 return -EFAULT;
 209         if (copy_to_user(uts, &ts, sizeof(ts)))
 210                 return -EFAULT;
 211
 212         *kts = uts;
 213         return 0;
 214 }
 215
 216 static long compat_nanosleep_restart(struct restart_block *restart)
 217 {
 218         struct compat_timespec __user *rmtp;
 219         struct timespec rmt;
 220         mm_segment_t oldfs;
 221         long ret;
 222
 223         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 224         oldfs = get_fs();
 225         set_fs(KERNEL_DS);
 226         ret = hrtimer_nanosleep_restart(restart);
 227         set_fs(oldfs);
 228
 229         if (ret == -ERESTART_RESTARTBLOCK) {
 230                 rmtp = restart->nanosleep.compat_rmtp;
 231
 232                 if (rmtp && compat_put_timespec(&rmt, rmtp))
 233                         return -EFAULT;
 234         }
 235
 236         return ret;
 237 }
 238
 239 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
 240                        struct compat_timespec __user *, rmtp)
 241 {
 242         struct timespec tu, rmt;
 243         mm_segment_t oldfs;
 244         long ret;
 245
 246         if (compat_get_timespec(&tu, rqtp))
 247                 return -EFAULT;
 248
 249         if (!timespec_valid(&tu))
 250                 return -EINVAL;
 251
 252         oldfs = get_fs();
 253         set_fs(KERNEL_DS);
 254         ret = hrtimer_nanosleep(&tu,
 255                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 256                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 257         set_fs(oldfs);
 258
 259         /*
 260          * hrtimer_nanosleep() can only return 0 or
 261          * -ERESTART_RESTARTBLOCK here because:
 262          *
 263          * - we call it with HRTIMER_MODE_REL and therefor exclude the
 264          *   -ERESTARTNOHAND return path.
 265          *
 266          * - we supply the rmtp argument from the task stack (due to
 267          *   the necessary compat conversion. So the update cannot
 268          *   fail, which excludes the -EFAULT return path as well. If
 269          *   it fails nevertheless we have a bigger problem and wont
 270          *   reach this place anymore.
 271          *
 272          * - if the return value is 0, we do not have to update rmtp
 273          *    because there is no remaining time.
 274          *
 275          * We check for -ERESTART_RESTARTBLOCK nevertheless if the
 276          * core implementation decides to return random nonsense.
 277          */
 278         if (ret == -ERESTART_RESTARTBLOCK) {
 279                 struct restart_block *restart = &current->restart_block;
 280
 281                 restart->fn = compat_nanosleep_restart;
 282                 restart->nanosleep.compat_rmtp = rmtp;
 283
 284                 if (rmtp && compat_put_timespec(&rmt, rmtp))
 285                         return -EFAULT;
 286         }
 287         return ret;
 288 }
 289
 290 static inline long get_compat_itimerval(struct itimerval *o,
 291                 struct compat_itimerval __user *i)
 292 {
 293         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 294                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 295                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 296                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 297                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 298 }
 299
 300 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 301                 struct itimerval *i)
 302 {
 303         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 304                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 305                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 306                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 307                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 308 }
 309
 310 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
 311                 struct compat_itimerval __user *, it)
 312 {
 313         struct itimerval kit;
 314         int error;
 315
 316         error = do_getitimer(which, &kit);
 317         if (!error && put_compat_itimerval(it, &kit))
 318                 error = -EFAULT;
 319         return error;
 320 }
 321
 322 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
 323                 struct compat_itimerval __user *, in,
 324                 struct compat_itimerval __user *, out)
 325 {
 326         struct itimerval kin, kout;
 327         int error;
 328
 329         if (in) {
 330                 if (get_compat_itimerval(&kin, in))
 331                         return -EFAULT;
 332         } else
 333                 memset(&kin, 0, sizeof(kin));
 334
 335         error = do_setitimer(which, &kin, out ? &kout : NULL);
 336         if (error || !out)
 337                 return error;
 338         if (put_compat_itimerval(out, &kout))
 339                 return -EFAULT;
 340         return 0;
 341 }
 342
 343 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 344 {
 345         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 346 }
 347
 348 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
 349 {
 350         if (tbuf) {
 351                 struct tms tms;
 352                 struct compat_tms tmp;
 353
 354                 do_sys_times(&tms);
 355                 /* Convert our struct tms to the compat version. */
 356                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 357                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 358                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 359                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 360                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 361                         return -EFAULT;
 362         }
 363         force_successful_syscall_return();
 364         return compat_jiffies_to_clock_t(jiffies);
 365 }
 366
 367 #ifdef __ARCH_WANT_SYS_SIGPENDING
 368
 369 /*
 370  * Assumption: old_sigset_t and compat_old_sigset_t are both
 371  * types that can be passed to put_user()/get_user().
 372  */
 373
 374 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
 375 {
 376         old_sigset_t s;
 377         long ret;
 378         mm_segment_t old_fs = get_fs();
 379
 380         set_fs(KERNEL_DS);
 381         ret = sys_sigpending((old_sigset_t __user *) &s);
 382         set_fs(old_fs);
 383         if (ret == 0)
 384                 ret = put_user(s, set);
 385         return ret;
 386 }
 387
 388 #endif
 389
 390 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 391
 392 /*
 393  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 394  * blocked set of signals to the supplied signal set
 395  */
 396 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 397 {
 398         memcpy(blocked->sig, &set, sizeof(set));
 399 }
 400
 401 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
 402                        compat_old_sigset_t __user *, nset,
 403                        compat_old_sigset_t __user *, oset)
 404 {
 405         old_sigset_t old_set, new_set;
 406         sigset_t new_blocked;
 407
 408         old_set = current->blocked.sig[0];
 409
 410         if (nset) {
 411                 if (get_user(new_set, nset))
 412                         return -EFAULT;
 413                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 414
 415                 new_blocked = current->blocked;
 416
 417                 switch (how) {
 418                 case SIG_BLOCK:
 419                         sigaddsetmask(&new_blocked, new_set);
 420                         break;
 421                 case SIG_UNBLOCK:
 422                         sigdelsetmask(&new_blocked, new_set);
 423                         break;
 424                 case SIG_SETMASK:
 425                         compat_sig_setmask(&new_blocked, new_set);
 426                         break;
 427                 default:
 428                         return -EINVAL;
 429                 }
 430
 431                 set_current_blocked(&new_blocked);
 432         }
 433
 434         if (oset) {
 435                 if (put_user(old_set, oset))
 436                         return -EFAULT;
 437         }
 438
 439         return 0;
 440 }
 441
 442 #endif
 443
 444 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
 445                        struct compat_rlimit __user *, rlim)
 446 {
 447         struct rlimit r;
 448
 449         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 450             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 451             __get_user(r.rlim_max, &rlim->rlim_max))
 452                 return -EFAULT;
 453
 454         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 455                 r.rlim_cur = RLIM_INFINITY;
 456         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 457                 r.rlim_max = RLIM_INFINITY;
 458         return do_prlimit(current, resource, &r, NULL);
 459 }
 460
 461 #ifdef COMPAT_RLIM_OLD_INFINITY
 462
 463 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
 464                        struct compat_rlimit __user *, rlim)
 465 {
 466         struct rlimit r;
 467         int ret;
 468         mm_segment_t old_fs = get_fs();
 469
 470         set_fs(KERNEL_DS);
 471         ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
 472         set_fs(old_fs);
 473
 474         if (!ret) {
 475                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 476                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 477                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 478                         r.rlim_max = COMPAT_RLIM_INFINITY;
 479
 480                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 481                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 482                     __put_user(r.rlim_max, &rlim->rlim_max))
 483                         return -EFAULT;
 484         }
 485         return ret;
 486 }
 487
 488 #endif
 489
 490 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
 491                        struct compat_rlimit __user *, rlim)
 492 {
 493         struct rlimit r;
 494         int ret;
 495
 496         ret = do_prlimit(current, resource, NULL, &r);
 497         if (!ret) {
 498                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 499                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 500                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 501                         r.rlim_max = COMPAT_RLIM_INFINITY;
 502
 503                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 504                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 505                     __put_user(r.rlim_max, &rlim->rlim_max))
 506                         return -EFAULT;
 507         }
 508         return ret;
 509 }
 510
 511 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 512 {
 513         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 514             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 515             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 516             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 517             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 518             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 519             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 520             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 521             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 522             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 523             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 524             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 525             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 526             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 527             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 528             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 529             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 530             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 531             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 532                 return -EFAULT;
 533         return 0;
 534 }
 535
 536 COMPAT_SYSCALL_DEFINE4(wait4,
 537         compat_pid_t, pid,
 538         compat_uint_t __user *, stat_addr,
 539         int, options,
 540         struct compat_rusage __user *, ru)
 541 {
 542         if (!ru) {
 543                 return sys_wait4(pid, stat_addr, options, NULL);
 544         } else {
 545                 struct rusage r;
 546                 int ret;
 547                 unsigned int status;
 548                 mm_segment_t old_fs = get_fs();
 549
 550                 set_fs (KERNEL_DS);
 551                 ret = sys_wait4(pid,
 552                                 (stat_addr ?
 553                                  (unsigned int __user *) &status : NULL),
 554                                 options, (struct rusage __user *) &r);
 555                 set_fs (old_fs);
 556
 557                 if (ret > 0) {
 558                         if (put_compat_rusage(&r, ru))
 559                                 return -EFAULT;
 560                         if (stat_addr && put_user(status, stat_addr))
 561                                 return -EFAULT;
 562                 }
 563                 return ret;
 564         }
 565 }
 566
 567 COMPAT_SYSCALL_DEFINE5(waitid,
 568                 int, which, compat_pid_t, pid,
 569                 struct compat_siginfo __user *, uinfo, int, options,
 570                 struct compat_rusage __user *, uru)
 571 {
 572         siginfo_t info;
 573         struct rusage ru;
 574         long ret;
 575         mm_segment_t old_fs = get_fs();
 576
 577         memset(&info, 0, sizeof(info));
 578
 579         set_fs(KERNEL_DS);
 580         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 581                          uru ? (struct rusage __user *)&ru : NULL);
 582         set_fs(old_fs);
 583
 584         if ((ret < 0) || (info.si_signo == 0))
 585                 return ret;
 586
 587         if (uru) {
 588                 /* sys_waitid() overwrites everything in ru */
 589                 if (COMPAT_USE_64BIT_TIME)
 590                         ret = copy_to_user(uru, &ru, sizeof(ru));
 591                 else
 592                         ret = put_compat_rusage(&ru, uru);
 593                 if (ret)
 594                         return -EFAULT;
 595         }
 596
 597         BUG_ON(info.si_code & __SI_MASK);
 598         info.si_code |= __SI_CHLD;
 599         return copy_siginfo_to_user32(uinfo, &info);
 600 }
 601
 602 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 603                                     unsigned len, struct cpumask *new_mask)
 604 {
 605         unsigned long *k;
 606
 607         if (len < cpumask_size())
 608                 memset(new_mask, 0, cpumask_size());
 609         else if (len > cpumask_size())
 610                 len = cpumask_size();
 611
 612         k = cpumask_bits(new_mask);
 613         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 614 }
 615
 616 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
 617                        unsigned int, len,
 618                        compat_ulong_t __user *, user_mask_ptr)
 619 {
 620         cpumask_var_t new_mask;
 621         int retval;
 622
 623         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 624                 return -ENOMEM;
 625
 626         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 627         if (retval)
 628                 goto out;
 629
 630         retval = sched_setaffinity(pid, new_mask);
 631 out:
 632         free_cpumask_var(new_mask);
 633         return retval;
 634 }
 635
 636 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t,  pid, unsigned int, len,
 637                        compat_ulong_t __user *, user_mask_ptr)
 638 {
 639         int ret;
 640         cpumask_var_t mask;
 641
 642         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 643                 return -EINVAL;
 644         if (len & (sizeof(compat_ulong_t)-1))
 645                 return -EINVAL;
 646
 647         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 648                 return -ENOMEM;
 649
 650         ret = sched_getaffinity(pid, mask);
 651         if (ret == 0) {
 652                 size_t retlen = min_t(size_t, len, cpumask_size());
 653
 654                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 655                         ret = -EFAULT;
 656                 else
 657                         ret = retlen;
 658         }
 659         free_cpumask_var(mask);
 660
 661         return ret;
 662 }
 663
 664 int get_compat_itimerspec(struct itimerspec *dst,
 665                           const struct compat_itimerspec __user *src)
 666 {
 667         if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
 668             __compat_get_timespec(&dst->it_value, &src->it_value))
 669                 return -EFAULT;
 670         return 0;
 671 }
 672
 673 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 674                           const struct itimerspec *src)
 675 {
 676         if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
 677             __compat_put_timespec(&src->it_value, &dst->it_value))
 678                 return -EFAULT;
 679         return 0;
 680 }
 681
 682 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
 683                        struct compat_sigevent __user *, timer_event_spec,
 684                        timer_t __user *, created_timer_id)
 685 {
 686         struct sigevent __user *event = NULL;
 687
 688         if (timer_event_spec) {
 689                 struct sigevent kevent;
 690
 691                 event = compat_alloc_user_space(sizeof(*event));
 692                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 693                     copy_to_user(event, &kevent, sizeof(*event)))
 694                         return -EFAULT;
 695         }
 696
 697         return sys_timer_create(which_clock, event, created_timer_id);
 698 }
 699
 700 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
 701                        struct compat_itimerspec __user *, new,
 702                        struct compat_itimerspec __user *, old)
 703 {
 704         long err;
 705         mm_segment_t oldfs;
 706         struct itimerspec newts, oldts;
 707
 708         if (!new)
 709                 return -EINVAL;
 710         if (get_compat_itimerspec(&newts, new))
 711                 return -EFAULT;
 712         oldfs = get_fs();
 713         set_fs(KERNEL_DS);
 714         err = sys_timer_settime(timer_id, flags,
 715                                 (struct itimerspec __user *) &newts,
 716                                 (struct itimerspec __user *) &oldts);
 717         set_fs(oldfs);
 718         if (!err && old && put_compat_itimerspec(old, &oldts))
 719                 return -EFAULT;
 720         return err;
 721 }
 722
 723 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
 724                        struct compat_itimerspec __user *, setting)
 725 {
 726         long err;
 727         mm_segment_t oldfs;
 728         struct itimerspec ts;
 729
 730         oldfs = get_fs();
 731         set_fs(KERNEL_DS);
 732         err = sys_timer_gettime(timer_id,
 733                                 (struct itimerspec __user *) &ts);
 734         set_fs(oldfs);
 735         if (!err && put_compat_itimerspec(setting, &ts))
 736                 return -EFAULT;
 737         return err;
 738 }
 739
 740 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
 741                        struct compat_timespec __user *, tp)
 742 {
 743         long err;
 744         mm_segment_t oldfs;
 745         struct timespec ts;
 746
 747         if (compat_get_timespec(&ts, tp))
 748                 return -EFAULT;
 749         oldfs = get_fs();
 750         set_fs(KERNEL_DS);
 751         err = sys_clock_settime(which_clock,
 752                                 (struct timespec __user *) &ts);
 753         set_fs(oldfs);
 754         return err;
 755 }
 756
 757 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
 758                        struct compat_timespec __user *, tp)
 759 {
 760         long err;
 761         mm_segment_t oldfs;
 762         struct timespec ts;
 763
 764         oldfs = get_fs();
 765         set_fs(KERNEL_DS);
 766         err = sys_clock_gettime(which_clock,
 767                                 (struct timespec __user *) &ts);
 768         set_fs(oldfs);
 769         if (!err && compat_put_timespec(&ts, tp))
 770                 return -EFAULT;
 771         return err;
 772 }
 773
 774 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
 775                        struct compat_timex __user *, utp)
 776 {
 777         struct timex txc;
 778         mm_segment_t oldfs;
 779         int err, ret;
 780
 781         err = compat_get_timex(&txc, utp);
 782         if (err)
 783                 return err;
 784
 785         oldfs = get_fs();
 786         set_fs(KERNEL_DS);
 787         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 788         set_fs(oldfs);
 789
 790         err = compat_put_timex(utp, &txc);
 791         if (err)
 792                 return err;
 793
 794         return ret;
 795 }
 796
 797 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
 798                        struct compat_timespec __user *, tp)
 799 {
 800         long err;
 801         mm_segment_t oldfs;
 802         struct timespec ts;
 803
 804         oldfs = get_fs();
 805         set_fs(KERNEL_DS);
 806         err = sys_clock_getres(which_clock,
 807                                (struct timespec __user *) &ts);
 808         set_fs(oldfs);
 809         if (!err && tp && compat_put_timespec(&ts, tp))
 810                 return -EFAULT;
 811         return err;
 812 }
 813
 814 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 815 {
 816         long err;
 817         mm_segment_t oldfs;
 818         struct timespec tu;
 819         struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
 820
 821         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 822         oldfs = get_fs();
 823         set_fs(KERNEL_DS);
 824         err = clock_nanosleep_restart(restart);
 825         set_fs(oldfs);
 826
 827         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 828             compat_put_timespec(&tu, rmtp))
 829                 return -EFAULT;
 830
 831         if (err == -ERESTART_RESTARTBLOCK) {
 832                 restart->fn = compat_clock_nanosleep_restart;
 833                 restart->nanosleep.compat_rmtp = rmtp;
 834         }
 835         return err;
 836 }
 837
 838 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
 839                        struct compat_timespec __user *, rqtp,
 840                        struct compat_timespec __user *, rmtp)
 841 {
 842         long err;
 843         mm_segment_t oldfs;
 844         struct timespec in, out;
 845         struct restart_block *restart;
 846
 847         if (compat_get_timespec(&in, rqtp))
 848                 return -EFAULT;
 849
 850         oldfs = get_fs();
 851         set_fs(KERNEL_DS);
 852         err = sys_clock_nanosleep(which_clock, flags,
 853                                   (struct timespec __user *) &in,
 854                                   (struct timespec __user *) &out);
 855         set_fs(oldfs);
 856
 857         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 858             compat_put_timespec(&out, rmtp))
 859                 return -EFAULT;
 860
 861         if (err == -ERESTART_RESTARTBLOCK) {
 862                 restart = &current->restart_block;
 863                 restart->fn = compat_clock_nanosleep_restart;
 864                 restart->nanosleep.compat_rmtp = rmtp;
 865         }
 866         return err;
 867 }
 868
 869 /*
 870  * We currently only need the following fields from the sigevent
 871  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 872  * sigev_notify_thread_id).  The others are handled in user mode.
 873  * We also assume that copying sigev_value.sival_int is sufficient
 874  * to keep all the bits of sigev_value.sival_ptr intact.
 875  */
 876 int get_compat_sigevent(struct sigevent *event,
 877                 const struct compat_sigevent __user *u_event)
 878 {
 879         memset(event, 0, sizeof(*event));
 880         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 881                 __get_user(event->sigev_value.sival_int,
 882                         &u_event->sigev_value.sival_int) ||
 883                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 884                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 885                 __get_user(event->sigev_notify_thread_id,
 886                         &u_event->sigev_notify_thread_id))
 887                 ? -EFAULT : 0;
 888 }
 889
 890 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 891                        unsigned long bitmap_size)
 892 {
 893         int i, j;
 894         unsigned long m;
 895         compat_ulong_t um;
 896         unsigned long nr_compat_longs;
 897
 898         /* align bitmap up to nearest compat_long_t boundary */
 899         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 900
 901         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 902                 return -EFAULT;
 903
 904         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 905
 906         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 907                 m = 0;
 908
 909                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 910                         /*
 911                          * We dont want to read past the end of the userspace
 912                          * bitmap. We must however ensure the end of the
 913                          * kernel bitmap is zeroed.
 914                          */
 915                         if (nr_compat_longs) {
 916                                 nr_compat_longs--;
 917                                 if (__get_user(um, umask))
 918                                         return -EFAULT;
 919                         } else {
 920                                 um = 0;
 921                         }
 922
 923                         umask++;
 924                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 925                 }
 926                 *mask++ = m;
 927         }
 928
 929         return 0;
 930 }
 931
 932 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 933                        unsigned long bitmap_size)
 934 {
 935         int i, j;
 936         unsigned long m;
 937         compat_ulong_t um;
 938         unsigned long nr_compat_longs;
 939
 940         /* align bitmap up to nearest compat_long_t boundary */
 941         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 942
 943         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 944                 return -EFAULT;
 945
 946         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 947
 948         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 949                 m = *mask++;
 950
 951                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 952                         um = m;
 953
 954                         /*
 955                          * We dont want to write past the end of the userspace
 956                          * bitmap.
 957                          */
 958                         if (nr_compat_longs) {
 959                                 nr_compat_longs--;
 960                                 if (__put_user(um, umask))
 961                                         return -EFAULT;
 962                         }
 963
 964                         umask++;
 965                         m >>= 4*sizeof(um);
 966                         m >>= 4*sizeof(um);
 967                 }
 968         }
 969
 970         return 0;
 971 }
 972
 973 void
 974 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
 975 {
 976         switch (_NSIG_WORDS) {
 977         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 978         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 979         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 980         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 981         }
 982 }
 983 EXPORT_SYMBOL_GPL(sigset_from_compat);
 984
 985 void
 986 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
 987 {
 988         switch (_NSIG_WORDS) {
 989         case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
 990         case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
 991         case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
 992         case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
 993         }
 994 }
 995
 996 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
 997                 struct compat_siginfo __user *, uinfo,
 998                 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
 999 {
1000         compat_sigset_t s32;
1001         sigset_t s;
1002         struct timespec t;
1003         siginfo_t info;
1004         long ret;
1005
1006         if (sigsetsize != sizeof(sigset_t))
1007                 return -EINVAL;
1008
1009         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1010                 return -EFAULT;
1011         sigset_from_compat(&s, &s32);
1012
1013         if (uts) {
1014                 if (compat_get_timespec(&t, uts))
1015                         return -EFAULT;
1016         }
1017
1018         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1019
1020         if (ret > 0 && uinfo) {
1021                 if (copy_siginfo_to_user32(uinfo, &info))
1022                         ret = -EFAULT;
1023         }
1024
1025         return ret;
1026 }
1027
1028 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1029
1030 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1031
1032 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1033 {
1034         compat_time_t i;
1035         struct timeval tv;
1036
1037         do_gettimeofday(&tv);
1038         i = tv.tv_sec;
1039
1040         if (tloc) {
1041                 if (put_user(i,tloc))
1042                         return -EFAULT;
1043         }
1044         force_successful_syscall_return();
1045         return i;
1046 }
1047
1048 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1049 {
1050         struct timespec tv;
1051         int err;
1052
1053         if (get_user(tv.tv_sec, tptr))
1054                 return -EFAULT;
1055
1056         tv.tv_nsec = 0;
1057
1058         err = security_settime(&tv, NULL);
1059         if (err)
1060                 return err;
1061
1062         do_settimeofday(&tv);
1063         return 0;
1064 }
1065
1066 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1067
1068 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1069 {
1070         struct timex txc;
1071         int err, ret;
1072
1073         err = compat_get_timex(&txc, utp);
1074         if (err)
1075                 return err;
1076
1077         ret = do_adjtimex(&txc);
1078
1079         err = compat_put_timex(utp, &txc);
1080         if (err)
1081                 return err;
1082
1083         return ret;
1084 }
1085
1086 #ifdef CONFIG_NUMA
1087 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1088                        compat_uptr_t __user *, pages32,
1089                        const int __user *, nodes,
1090                        int __user *, status,
1091                        int, flags)
1092 {
1093         const void __user * __user *pages;
1094         int i;
1095
1096         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1097         for (i = 0; i < nr_pages; i++) {
1098                 compat_uptr_t p;
1099
1100                 if (get_user(p, pages32 + i) ||
1101                         put_user(compat_ptr(p), pages + i))
1102                         return -EFAULT;
1103         }
1104         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1105 }
1106
1107 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1108                        compat_ulong_t, maxnode,
1109                        const compat_ulong_t __user *, old_nodes,
1110                        const compat_ulong_t __user *, new_nodes)
1111 {
1112         unsigned long __user *old = NULL;
1113         unsigned long __user *new = NULL;
1114         nodemask_t tmp_mask;
1115         unsigned long nr_bits;
1116         unsigned long size;
1117
1118         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1119         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1120         if (old_nodes) {
1121                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1122                         return -EFAULT;
1123                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1124                 if (new_nodes)
1125                         new = old + size / sizeof(unsigned long);
1126                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1127                         return -EFAULT;
1128         }
1129         if (new_nodes) {
1130                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1131                         return -EFAULT;
1132                 if (new == NULL)
1133                         new = compat_alloc_user_space(size);
1134                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1135                         return -EFAULT;
1136         }
1137         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1138 }
1139 #endif
1140
1141 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1142                        compat_pid_t, pid,
1143                        struct compat_timespec __user *, interval)
1144 {
1145         struct timespec t;
1146         int ret;
1147         mm_segment_t old_fs = get_fs();
1148
1149         set_fs(KERNEL_DS);
1150         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1151         set_fs(old_fs);
1152         if (compat_put_timespec(&t, interval))
1153                 return -EFAULT;
1154         return ret;
1155 }
1156
1157 /*
1158  * Allocate user-space memory for the duration of a single system call,
1159  * in order to marshall parameters inside a compat thunk.
1160  */
1161 void __user *compat_alloc_user_space(unsigned long len)
1162 {
1163         void __user *ptr;
1164
1165         /* If len would occupy more than half of the entire compat space... */
1166         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1167                 return NULL;
1168
1169         ptr = arch_compat_alloc_user_space(len);
1170
1171         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1172                 return NULL;
1173
1174         return ptr;
1175 }
1176 EXPORT_SYMBOL_GPL(compat_alloc_user_space);