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 <linux/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 timespec64 new_ts;
 112         struct timeval user_tv;
 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_settimeofday64(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         struct timespec64 tu64;
 244         mm_segment_t oldfs;
 245         long ret;
 246
 247         if (compat_get_timespec(&tu, rqtp))
 248                 return -EFAULT;
 249
 250         tu64 = timespec_to_timespec64(tu);
 251         if (!timespec64_valid(&tu64))
 252                 return -EINVAL;
 253
 254         oldfs = get_fs();
 255         set_fs(KERNEL_DS);
 256         ret = hrtimer_nanosleep(&tu64,
 257                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 258                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 259         set_fs(oldfs);
 260
 261         /*
 262          * hrtimer_nanosleep() can only return 0 or
 263          * -ERESTART_RESTARTBLOCK here because:
 264          *
 265          * - we call it with HRTIMER_MODE_REL and therefor exclude the
 266          *   -ERESTARTNOHAND return path.
 267          *
 268          * - we supply the rmtp argument from the task stack (due to
 269          *   the necessary compat conversion. So the update cannot
 270          *   fail, which excludes the -EFAULT return path as well. If
 271          *   it fails nevertheless we have a bigger problem and wont
 272          *   reach this place anymore.
 273          *
 274          * - if the return value is 0, we do not have to update rmtp
 275          *    because there is no remaining time.
 276          *
 277          * We check for -ERESTART_RESTARTBLOCK nevertheless if the
 278          * core implementation decides to return random nonsense.
 279          */
 280         if (ret == -ERESTART_RESTARTBLOCK) {
 281                 struct restart_block *restart = &current->restart_block;
 282
 283                 restart->fn = compat_nanosleep_restart;
 284                 restart->nanosleep.compat_rmtp = rmtp;
 285
 286                 if (rmtp && compat_put_timespec(&rmt, rmtp))
 287                         return -EFAULT;
 288         }
 289         return ret;
 290 }
 291
 292 static inline long get_compat_itimerval(struct itimerval *o,
 293                 struct compat_itimerval __user *i)
 294 {
 295         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 296                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 297                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 298                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 299                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 300 }
 301
 302 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 303                 struct itimerval *i)
 304 {
 305         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 306                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 307                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 308                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 309                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 310 }
 311
 312 asmlinkage long sys_ni_posix_timers(void);
 313
 314 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
 315                 struct compat_itimerval __user *, it)
 316 {
 317         struct itimerval kit;
 318         int error;
 319
 320         if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
 321                 return sys_ni_posix_timers();
 322
 323         error = do_getitimer(which, &kit);
 324         if (!error && put_compat_itimerval(it, &kit))
 325                 error = -EFAULT;
 326         return error;
 327 }
 328
 329 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
 330                 struct compat_itimerval __user *, in,
 331                 struct compat_itimerval __user *, out)
 332 {
 333         struct itimerval kin, kout;
 334         int error;
 335
 336         if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
 337                 return sys_ni_posix_timers();
 338
 339         if (in) {
 340                 if (get_compat_itimerval(&kin, in))
 341                         return -EFAULT;
 342         } else
 343                 memset(&kin, 0, sizeof(kin));
 344
 345         error = do_setitimer(which, &kin, out ? &kout : NULL);
 346         if (error || !out)
 347                 return error;
 348         if (put_compat_itimerval(out, &kout))
 349                 return -EFAULT;
 350         return 0;
 351 }
 352
 353 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 354 {
 355         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 356 }
 357
 358 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
 359 {
 360         if (tbuf) {
 361                 struct tms tms;
 362                 struct compat_tms tmp;
 363
 364                 do_sys_times(&tms);
 365                 /* Convert our struct tms to the compat version. */
 366                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 367                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 368                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 369                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 370                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 371                         return -EFAULT;
 372         }
 373         force_successful_syscall_return();
 374         return compat_jiffies_to_clock_t(jiffies);
 375 }
 376
 377 #ifdef __ARCH_WANT_SYS_SIGPENDING
 378
 379 /*
 380  * Assumption: old_sigset_t and compat_old_sigset_t are both
 381  * types that can be passed to put_user()/get_user().
 382  */
 383
 384 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
 385 {
 386         old_sigset_t s;
 387         long ret;
 388         mm_segment_t old_fs = get_fs();
 389
 390         set_fs(KERNEL_DS);
 391         ret = sys_sigpending((old_sigset_t __user *) &s);
 392         set_fs(old_fs);
 393         if (ret == 0)
 394                 ret = put_user(s, set);
 395         return ret;
 396 }
 397
 398 #endif
 399
 400 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 401
 402 /*
 403  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 404  * blocked set of signals to the supplied signal set
 405  */
 406 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 407 {
 408         memcpy(blocked->sig, &set, sizeof(set));
 409 }
 410
 411 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
 412                        compat_old_sigset_t __user *, nset,
 413                        compat_old_sigset_t __user *, oset)
 414 {
 415         old_sigset_t old_set, new_set;
 416         sigset_t new_blocked;
 417
 418         old_set = current->blocked.sig[0];
 419
 420         if (nset) {
 421                 if (get_user(new_set, nset))
 422                         return -EFAULT;
 423                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 424
 425                 new_blocked = current->blocked;
 426
 427                 switch (how) {
 428                 case SIG_BLOCK:
 429                         sigaddsetmask(&new_blocked, new_set);
 430                         break;
 431                 case SIG_UNBLOCK:
 432                         sigdelsetmask(&new_blocked, new_set);
 433                         break;
 434                 case SIG_SETMASK:
 435                         compat_sig_setmask(&new_blocked, new_set);
 436                         break;
 437                 default:
 438                         return -EINVAL;
 439                 }
 440
 441                 set_current_blocked(&new_blocked);
 442         }
 443
 444         if (oset) {
 445                 if (put_user(old_set, oset))
 446                         return -EFAULT;
 447         }
 448
 449         return 0;
 450 }
 451
 452 #endif
 453
 454 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
 455                        struct compat_rlimit __user *, rlim)
 456 {
 457         struct rlimit r;
 458
 459         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 460             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 461             __get_user(r.rlim_max, &rlim->rlim_max))
 462                 return -EFAULT;
 463
 464         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 465                 r.rlim_cur = RLIM_INFINITY;
 466         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 467                 r.rlim_max = RLIM_INFINITY;
 468         return do_prlimit(current, resource, &r, NULL);
 469 }
 470
 471 #ifdef COMPAT_RLIM_OLD_INFINITY
 472
 473 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
 474                        struct compat_rlimit __user *, rlim)
 475 {
 476         struct rlimit r;
 477         int ret;
 478         mm_segment_t old_fs = get_fs();
 479
 480         set_fs(KERNEL_DS);
 481         ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
 482         set_fs(old_fs);
 483
 484         if (!ret) {
 485                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 486                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 487                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 488                         r.rlim_max = COMPAT_RLIM_INFINITY;
 489
 490                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 491                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 492                     __put_user(r.rlim_max, &rlim->rlim_max))
 493                         return -EFAULT;
 494         }
 495         return ret;
 496 }
 497
 498 #endif
 499
 500 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
 501                        struct compat_rlimit __user *, rlim)
 502 {
 503         struct rlimit r;
 504         int ret;
 505
 506         ret = do_prlimit(current, resource, NULL, &r);
 507         if (!ret) {
 508                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 509                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 510                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 511                         r.rlim_max = COMPAT_RLIM_INFINITY;
 512
 513                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 514                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 515                     __put_user(r.rlim_max, &rlim->rlim_max))
 516                         return -EFAULT;
 517         }
 518         return ret;
 519 }
 520
 521 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 522 {
 523         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 524             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 525             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 526             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 527             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 528             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 529             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 530             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 531             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 532             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 533             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 534             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 535             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 536             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 537             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 538             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 539             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 540             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 541             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 542                 return -EFAULT;
 543         return 0;
 544 }
 545
 546 COMPAT_SYSCALL_DEFINE4(wait4,
 547         compat_pid_t, pid,
 548         compat_uint_t __user *, stat_addr,
 549         int, options,
 550         struct compat_rusage __user *, ru)
 551 {
 552         if (!ru) {
 553                 return sys_wait4(pid, stat_addr, options, NULL);
 554         } else {
 555                 struct rusage r;
 556                 int ret;
 557                 unsigned int status;
 558                 mm_segment_t old_fs = get_fs();
 559
 560                 set_fs (KERNEL_DS);
 561                 ret = sys_wait4(pid,
 562                                 (stat_addr ?
 563                                  (unsigned int __user *) &status : NULL),
 564                                 options, (struct rusage __user *) &r);
 565                 set_fs (old_fs);
 566
 567                 if (ret > 0) {
 568                         if (put_compat_rusage(&r, ru))
 569                                 return -EFAULT;
 570                         if (stat_addr && put_user(status, stat_addr))
 571                                 return -EFAULT;
 572                 }
 573                 return ret;
 574         }
 575 }
 576
 577 COMPAT_SYSCALL_DEFINE5(waitid,
 578                 int, which, compat_pid_t, pid,
 579                 struct compat_siginfo __user *, uinfo, int, options,
 580                 struct compat_rusage __user *, uru)
 581 {
 582         siginfo_t info;
 583         struct rusage ru;
 584         long ret;
 585         mm_segment_t old_fs = get_fs();
 586
 587         memset(&info, 0, sizeof(info));
 588
 589         set_fs(KERNEL_DS);
 590         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 591                          uru ? (struct rusage __user *)&ru : NULL);
 592         set_fs(old_fs);
 593
 594         if ((ret < 0) || (info.si_signo == 0))
 595                 return ret;
 596
 597         if (uru) {
 598                 /* sys_waitid() overwrites everything in ru */
 599                 if (COMPAT_USE_64BIT_TIME)
 600                         ret = copy_to_user(uru, &ru, sizeof(ru));
 601                 else
 602                         ret = put_compat_rusage(&ru, uru);
 603                 if (ret)
 604                         return -EFAULT;
 605         }
 606
 607         BUG_ON(info.si_code & __SI_MASK);
 608         info.si_code |= __SI_CHLD;
 609         return copy_siginfo_to_user32(uinfo, &info);
 610 }
 611
 612 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 613                                     unsigned len, struct cpumask *new_mask)
 614 {
 615         unsigned long *k;
 616
 617         if (len < cpumask_size())
 618                 memset(new_mask, 0, cpumask_size());
 619         else if (len > cpumask_size())
 620                 len = cpumask_size();
 621
 622         k = cpumask_bits(new_mask);
 623         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 624 }
 625
 626 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
 627                        unsigned int, len,
 628                        compat_ulong_t __user *, user_mask_ptr)
 629 {
 630         cpumask_var_t new_mask;
 631         int retval;
 632
 633         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 634                 return -ENOMEM;
 635
 636         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 637         if (retval)
 638                 goto out;
 639
 640         retval = sched_setaffinity(pid, new_mask);
 641 out:
 642         free_cpumask_var(new_mask);
 643         return retval;
 644 }
 645
 646 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t,  pid, unsigned int, len,
 647                        compat_ulong_t __user *, user_mask_ptr)
 648 {
 649         int ret;
 650         cpumask_var_t mask;
 651
 652         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 653                 return -EINVAL;
 654         if (len & (sizeof(compat_ulong_t)-1))
 655                 return -EINVAL;
 656
 657         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 658                 return -ENOMEM;
 659
 660         ret = sched_getaffinity(pid, mask);
 661         if (ret == 0) {
 662                 size_t retlen = min_t(size_t, len, cpumask_size());
 663
 664                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 665                         ret = -EFAULT;
 666                 else
 667                         ret = retlen;
 668         }
 669         free_cpumask_var(mask);
 670
 671         return ret;
 672 }
 673
 674 int get_compat_itimerspec(struct itimerspec *dst,
 675                           const struct compat_itimerspec __user *src)
 676 {
 677         if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
 678             __compat_get_timespec(&dst->it_value, &src->it_value))
 679                 return -EFAULT;
 680         return 0;
 681 }
 682
 683 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 684                           const struct itimerspec *src)
 685 {
 686         if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
 687             __compat_put_timespec(&src->it_value, &dst->it_value))
 688                 return -EFAULT;
 689         return 0;
 690 }
 691
 692 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
 693                        struct compat_sigevent __user *, timer_event_spec,
 694                        timer_t __user *, created_timer_id)
 695 {
 696         struct sigevent __user *event = NULL;
 697
 698         if (timer_event_spec) {
 699                 struct sigevent kevent;
 700
 701                 event = compat_alloc_user_space(sizeof(*event));
 702                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 703                     copy_to_user(event, &kevent, sizeof(*event)))
 704                         return -EFAULT;
 705         }
 706
 707         return sys_timer_create(which_clock, event, created_timer_id);
 708 }
 709
 710 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
 711                        struct compat_itimerspec __user *, new,
 712                        struct compat_itimerspec __user *, old)
 713 {
 714         long err;
 715         mm_segment_t oldfs;
 716         struct itimerspec newts, oldts;
 717
 718         if (!new)
 719                 return -EINVAL;
 720         if (get_compat_itimerspec(&newts, new))
 721                 return -EFAULT;
 722         oldfs = get_fs();
 723         set_fs(KERNEL_DS);
 724         err = sys_timer_settime(timer_id, flags,
 725                                 (struct itimerspec __user *) &newts,
 726                                 (struct itimerspec __user *) &oldts);
 727         set_fs(oldfs);
 728         if (!err && old && put_compat_itimerspec(old, &oldts))
 729                 return -EFAULT;
 730         return err;
 731 }
 732
 733 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
 734                        struct compat_itimerspec __user *, setting)
 735 {
 736         long err;
 737         mm_segment_t oldfs;
 738         struct itimerspec ts;
 739
 740         oldfs = get_fs();
 741         set_fs(KERNEL_DS);
 742         err = sys_timer_gettime(timer_id,
 743                                 (struct itimerspec __user *) &ts);
 744         set_fs(oldfs);
 745         if (!err && put_compat_itimerspec(setting, &ts))
 746                 return -EFAULT;
 747         return err;
 748 }
 749
 750 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
 751                        struct compat_timespec __user *, tp)
 752 {
 753         long err;
 754         mm_segment_t oldfs;
 755         struct timespec ts;
 756
 757         if (compat_get_timespec(&ts, tp))
 758                 return -EFAULT;
 759         oldfs = get_fs();
 760         set_fs(KERNEL_DS);
 761         err = sys_clock_settime(which_clock,
 762                                 (struct timespec __user *) &ts);
 763         set_fs(oldfs);
 764         return err;
 765 }
 766
 767 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
 768                        struct compat_timespec __user *, tp)
 769 {
 770         long err;
 771         mm_segment_t oldfs;
 772         struct timespec ts;
 773
 774         oldfs = get_fs();
 775         set_fs(KERNEL_DS);
 776         err = sys_clock_gettime(which_clock,
 777                                 (struct timespec __user *) &ts);
 778         set_fs(oldfs);
 779         if (!err && compat_put_timespec(&ts, tp))
 780                 return -EFAULT;
 781         return err;
 782 }
 783
 784 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
 785                        struct compat_timex __user *, utp)
 786 {
 787         struct timex txc;
 788         mm_segment_t oldfs;
 789         int err, ret;
 790
 791         err = compat_get_timex(&txc, utp);
 792         if (err)
 793                 return err;
 794
 795         oldfs = get_fs();
 796         set_fs(KERNEL_DS);
 797         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 798         set_fs(oldfs);
 799
 800         err = compat_put_timex(utp, &txc);
 801         if (err)
 802                 return err;
 803
 804         return ret;
 805 }
 806
 807 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
 808                        struct compat_timespec __user *, tp)
 809 {
 810         long err;
 811         mm_segment_t oldfs;
 812         struct timespec ts;
 813
 814         oldfs = get_fs();
 815         set_fs(KERNEL_DS);
 816         err = sys_clock_getres(which_clock,
 817                                (struct timespec __user *) &ts);
 818         set_fs(oldfs);
 819         if (!err && tp && compat_put_timespec(&ts, tp))
 820                 return -EFAULT;
 821         return err;
 822 }
 823
 824 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 825 {
 826         long err;
 827         mm_segment_t oldfs;
 828         struct timespec tu;
 829         struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
 830
 831         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 832         oldfs = get_fs();
 833         set_fs(KERNEL_DS);
 834         err = clock_nanosleep_restart(restart);
 835         set_fs(oldfs);
 836
 837         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 838             compat_put_timespec(&tu, rmtp))
 839                 return -EFAULT;
 840
 841         if (err == -ERESTART_RESTARTBLOCK) {
 842                 restart->fn = compat_clock_nanosleep_restart;
 843                 restart->nanosleep.compat_rmtp = rmtp;
 844         }
 845         return err;
 846 }
 847
 848 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
 849                        struct compat_timespec __user *, rqtp,
 850                        struct compat_timespec __user *, rmtp)
 851 {
 852         long err;
 853         mm_segment_t oldfs;
 854         struct timespec in, out;
 855         struct restart_block *restart;
 856
 857         if (compat_get_timespec(&in, rqtp))
 858                 return -EFAULT;
 859
 860         oldfs = get_fs();
 861         set_fs(KERNEL_DS);
 862         err = sys_clock_nanosleep(which_clock, flags,
 863                                   (struct timespec __user *) &in,
 864                                   (struct timespec __user *) &out);
 865         set_fs(oldfs);
 866
 867         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 868             compat_put_timespec(&out, rmtp))
 869                 return -EFAULT;
 870
 871         if (err == -ERESTART_RESTARTBLOCK) {
 872                 restart = &current->restart_block;
 873                 restart->fn = compat_clock_nanosleep_restart;
 874                 restart->nanosleep.compat_rmtp = rmtp;
 875         }
 876         return err;
 877 }
 878
 879 /*
 880  * We currently only need the following fields from the sigevent
 881  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 882  * sigev_notify_thread_id).  The others are handled in user mode.
 883  * We also assume that copying sigev_value.sival_int is sufficient
 884  * to keep all the bits of sigev_value.sival_ptr intact.
 885  */
 886 int get_compat_sigevent(struct sigevent *event,
 887                 const struct compat_sigevent __user *u_event)
 888 {
 889         memset(event, 0, sizeof(*event));
 890         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 891                 __get_user(event->sigev_value.sival_int,
 892                         &u_event->sigev_value.sival_int) ||
 893                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 894                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 895                 __get_user(event->sigev_notify_thread_id,
 896                         &u_event->sigev_notify_thread_id))
 897                 ? -EFAULT : 0;
 898 }
 899
 900 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 901                        unsigned long bitmap_size)
 902 {
 903         int i, j;
 904         unsigned long m;
 905         compat_ulong_t um;
 906         unsigned long nr_compat_longs;
 907
 908         /* align bitmap up to nearest compat_long_t boundary */
 909         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 910
 911         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 912                 return -EFAULT;
 913
 914         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 915
 916         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 917                 m = 0;
 918
 919                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 920                         /*
 921                          * We dont want to read past the end of the userspace
 922                          * bitmap. We must however ensure the end of the
 923                          * kernel bitmap is zeroed.
 924                          */
 925                         if (nr_compat_longs) {
 926                                 nr_compat_longs--;
 927                                 if (__get_user(um, umask))
 928                                         return -EFAULT;
 929                         } else {
 930                                 um = 0;
 931                         }
 932
 933                         umask++;
 934                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 935                 }
 936                 *mask++ = m;
 937         }
 938
 939         return 0;
 940 }
 941
 942 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 943                        unsigned long bitmap_size)
 944 {
 945         int i, j;
 946         unsigned long m;
 947         compat_ulong_t um;
 948         unsigned long nr_compat_longs;
 949
 950         /* align bitmap up to nearest compat_long_t boundary */
 951         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 952
 953         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 954                 return -EFAULT;
 955
 956         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 957
 958         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 959                 m = *mask++;
 960
 961                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 962                         um = m;
 963
 964                         /*
 965                          * We dont want to write past the end of the userspace
 966                          * bitmap.
 967                          */
 968                         if (nr_compat_longs) {
 969                                 nr_compat_longs--;
 970                                 if (__put_user(um, umask))
 971                                         return -EFAULT;
 972                         }
 973
 974                         umask++;
 975                         m >>= 4*sizeof(um);
 976                         m >>= 4*sizeof(um);
 977                 }
 978         }
 979
 980         return 0;
 981 }
 982
 983 void
 984 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
 985 {
 986         switch (_NSIG_WORDS) {
 987         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 988         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 989         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 990         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 991         }
 992 }
 993 EXPORT_SYMBOL_GPL(sigset_from_compat);
 994
 995 void
 996 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
 997 {
 998         switch (_NSIG_WORDS) {
 999         case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
1000         case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
1001         case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
1002         case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
1003         }
1004 }
1005
1006 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
1007                 struct compat_siginfo __user *, uinfo,
1008                 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1009 {
1010         compat_sigset_t s32;
1011         sigset_t s;
1012         struct timespec t;
1013         siginfo_t info;
1014         long ret;
1015
1016         if (sigsetsize != sizeof(sigset_t))
1017                 return -EINVAL;
1018
1019         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1020                 return -EFAULT;
1021         sigset_from_compat(&s, &s32);
1022
1023         if (uts) {
1024                 if (compat_get_timespec(&t, uts))
1025                         return -EFAULT;
1026         }
1027
1028         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1029
1030         if (ret > 0 && uinfo) {
1031                 if (copy_siginfo_to_user32(uinfo, &info))
1032                         ret = -EFAULT;
1033         }
1034
1035         return ret;
1036 }
1037
1038 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1039
1040 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1041
1042 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1043 {
1044         compat_time_t i;
1045         struct timeval tv;
1046
1047         do_gettimeofday(&tv);
1048         i = tv.tv_sec;
1049
1050         if (tloc) {
1051                 if (put_user(i,tloc))
1052                         return -EFAULT;
1053         }
1054         force_successful_syscall_return();
1055         return i;
1056 }
1057
1058 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1059 {
1060         struct timespec tv;
1061         int err;
1062
1063         if (get_user(tv.tv_sec, tptr))
1064                 return -EFAULT;
1065
1066         tv.tv_nsec = 0;
1067
1068         err = security_settime(&tv, NULL);
1069         if (err)
1070                 return err;
1071
1072         do_settimeofday(&tv);
1073         return 0;
1074 }
1075
1076 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1077
1078 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1079 {
1080         struct timex txc;
1081         int err, ret;
1082
1083         err = compat_get_timex(&txc, utp);
1084         if (err)
1085                 return err;
1086
1087         ret = do_adjtimex(&txc);
1088
1089         err = compat_put_timex(utp, &txc);
1090         if (err)
1091                 return err;
1092
1093         return ret;
1094 }
1095
1096 #ifdef CONFIG_NUMA
1097 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1098                        compat_uptr_t __user *, pages32,
1099                        const int __user *, nodes,
1100                        int __user *, status,
1101                        int, flags)
1102 {
1103         const void __user * __user *pages;
1104         int i;
1105
1106         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1107         for (i = 0; i < nr_pages; i++) {
1108                 compat_uptr_t p;
1109
1110                 if (get_user(p, pages32 + i) ||
1111                         put_user(compat_ptr(p), pages + i))
1112                         return -EFAULT;
1113         }
1114         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1115 }
1116
1117 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1118                        compat_ulong_t, maxnode,
1119                        const compat_ulong_t __user *, old_nodes,
1120                        const compat_ulong_t __user *, new_nodes)
1121 {
1122         unsigned long __user *old = NULL;
1123         unsigned long __user *new = NULL;
1124         nodemask_t tmp_mask;
1125         unsigned long nr_bits;
1126         unsigned long size;
1127
1128         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1129         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1130         if (old_nodes) {
1131                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1132                         return -EFAULT;
1133                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1134                 if (new_nodes)
1135                         new = old + size / sizeof(unsigned long);
1136                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1137                         return -EFAULT;
1138         }
1139         if (new_nodes) {
1140                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1141                         return -EFAULT;
1142                 if (new == NULL)
1143                         new = compat_alloc_user_space(size);
1144                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1145                         return -EFAULT;
1146         }
1147         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1148 }
1149 #endif
1150
1151 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1152                        compat_pid_t, pid,
1153                        struct compat_timespec __user *, interval)
1154 {
1155         struct timespec t;
1156         int ret;
1157         mm_segment_t old_fs = get_fs();
1158
1159         set_fs(KERNEL_DS);
1160         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1161         set_fs(old_fs);
1162         if (compat_put_timespec(&t, interval))
1163                 return -EFAULT;
1164         return ret;
1165 }
1166
1167 /*
1168  * Allocate user-space memory for the duration of a single system call,
1169  * in order to marshall parameters inside a compat thunk.
1170  */
1171 void __user *compat_alloc_user_space(unsigned long len)
1172 {
1173         void __user *ptr;
1174
1175         /* If len would occupy more than half of the entire compat space... */
1176         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1177                 return NULL;
1178
1179         ptr = arch_compat_alloc_user_space(len);
1180
1181         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1182                 return NULL;
1183
1184         return ptr;
1185 }
1186 EXPORT_SYMBOL_GPL(compat_alloc_user_space);