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 /*
  34  * Note that the native side is already converted to a timespec, because
  35  * that's what we want anyway.
  36  */
  37 static int compat_get_timeval(struct timespec *o,
  38                 struct compat_timeval __user *i)
  39 {
  40         long usec;
  41
  42         if (get_user(o->tv_sec, &i->tv_sec) ||
  43             get_user(usec, &i->tv_usec))
  44                 return -EFAULT;
  45         o->tv_nsec = usec * 1000;
  46         return 0;
  47 }
  48
  49 static int compat_put_timeval(struct compat_timeval __user *o,
  50                 struct timeval *i)
  51 {
  52         return (put_user(i->tv_sec, &o->tv_sec) ||
  53                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  54 }
  55
  56 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  57 {
  58         memset(txc, 0, sizeof(struct timex));
  59
  60         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  61                         __get_user(txc->modes, &utp->modes) ||
  62                         __get_user(txc->offset, &utp->offset) ||
  63                         __get_user(txc->freq, &utp->freq) ||
  64                         __get_user(txc->maxerror, &utp->maxerror) ||
  65                         __get_user(txc->esterror, &utp->esterror) ||
  66                         __get_user(txc->status, &utp->status) ||
  67                         __get_user(txc->constant, &utp->constant) ||
  68                         __get_user(txc->precision, &utp->precision) ||
  69                         __get_user(txc->tolerance, &utp->tolerance) ||
  70                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  71                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  72                         __get_user(txc->tick, &utp->tick) ||
  73                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  74                         __get_user(txc->jitter, &utp->jitter) ||
  75                         __get_user(txc->shift, &utp->shift) ||
  76                         __get_user(txc->stabil, &utp->stabil) ||
  77                         __get_user(txc->jitcnt, &utp->jitcnt) ||
  78                         __get_user(txc->calcnt, &utp->calcnt) ||
  79                         __get_user(txc->errcnt, &utp->errcnt) ||
  80                         __get_user(txc->stbcnt, &utp->stbcnt))
  81                 return -EFAULT;
  82
  83         return 0;
  84 }
  85
  86 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  87 {
  88         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  89                         __put_user(txc->modes, &utp->modes) ||
  90                         __put_user(txc->offset, &utp->offset) ||
  91                         __put_user(txc->freq, &utp->freq) ||
  92                         __put_user(txc->maxerror, &utp->maxerror) ||
  93                         __put_user(txc->esterror, &utp->esterror) ||
  94                         __put_user(txc->status, &utp->status) ||
  95                         __put_user(txc->constant, &utp->constant) ||
  96                         __put_user(txc->precision, &utp->precision) ||
  97                         __put_user(txc->tolerance, &utp->tolerance) ||
  98                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  99                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 100                         __put_user(txc->tick, &utp->tick) ||
 101                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 102                         __put_user(txc->jitter, &utp->jitter) ||
 103                         __put_user(txc->shift, &utp->shift) ||
 104                         __put_user(txc->stabil, &utp->stabil) ||
 105                         __put_user(txc->jitcnt, &utp->jitcnt) ||
 106                         __put_user(txc->calcnt, &utp->calcnt) ||
 107                         __put_user(txc->errcnt, &utp->errcnt) ||
 108                         __put_user(txc->stbcnt, &utp->stbcnt) ||
 109                         __put_user(txc->tai, &utp->tai))
 110                 return -EFAULT;
 111         return 0;
 112 }
 113
 114 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 115                 struct timezone __user *tz)
 116 {
 117         if (tv) {
 118                 struct timeval ktv;
 119                 do_gettimeofday(&ktv);
 120                 if (compat_put_timeval(tv, &ktv))
 121                         return -EFAULT;
 122         }
 123         if (tz) {
 124                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 125                         return -EFAULT;
 126         }
 127
 128         return 0;
 129 }
 130
 131 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 132                 struct timezone __user *tz)
 133 {
 134         struct timespec kts;
 135         struct timezone ktz;
 136
 137         if (tv) {
 138                 if (compat_get_timeval(&kts, tv))
 139                         return -EFAULT;
 140         }
 141         if (tz) {
 142                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 143                         return -EFAULT;
 144         }
 145
 146         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 147 }
 148
 149 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 150 {
 151         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 152                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 153                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 154 }
 155
 156 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 157 {
 158         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 159                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 160                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 161 }
 162 EXPORT_SYMBOL_GPL(put_compat_timespec);
 163
 164 static long compat_nanosleep_restart(struct restart_block *restart)
 165 {
 166         struct compat_timespec __user *rmtp;
 167         struct timespec rmt;
 168         mm_segment_t oldfs;
 169         long ret;
 170
 171         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 172         oldfs = get_fs();
 173         set_fs(KERNEL_DS);
 174         ret = hrtimer_nanosleep_restart(restart);
 175         set_fs(oldfs);
 176
 177         if (ret) {
 178                 rmtp = restart->nanosleep.compat_rmtp;
 179
 180                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 181                         return -EFAULT;
 182         }
 183
 184         return ret;
 185 }
 186
 187 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 188                                      struct compat_timespec __user *rmtp)
 189 {
 190         struct timespec tu, rmt;
 191         mm_segment_t oldfs;
 192         long ret;
 193
 194         if (get_compat_timespec(&tu, rqtp))
 195                 return -EFAULT;
 196
 197         if (!timespec_valid(&tu))
 198                 return -EINVAL;
 199
 200         oldfs = get_fs();
 201         set_fs(KERNEL_DS);
 202         ret = hrtimer_nanosleep(&tu,
 203                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 204                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 205         set_fs(oldfs);
 206
 207         if (ret) {
 208                 struct restart_block *restart
 209                         = &current_thread_info()->restart_block;
 210
 211                 restart->fn = compat_nanosleep_restart;
 212                 restart->nanosleep.compat_rmtp = rmtp;
 213
 214                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 215                         return -EFAULT;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static inline long get_compat_itimerval(struct itimerval *o,
 222                 struct compat_itimerval __user *i)
 223 {
 224         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 225                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 226                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 227                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 228                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 229 }
 230
 231 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 232                 struct itimerval *i)
 233 {
 234         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 235                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 236                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 237                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 238                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 239 }
 240
 241 asmlinkage long compat_sys_getitimer(int which,
 242                 struct compat_itimerval __user *it)
 243 {
 244         struct itimerval kit;
 245         int error;
 246
 247         error = do_getitimer(which, &kit);
 248         if (!error && put_compat_itimerval(it, &kit))
 249                 error = -EFAULT;
 250         return error;
 251 }
 252
 253 asmlinkage long compat_sys_setitimer(int which,
 254                 struct compat_itimerval __user *in,
 255                 struct compat_itimerval __user *out)
 256 {
 257         struct itimerval kin, kout;
 258         int error;
 259
 260         if (in) {
 261                 if (get_compat_itimerval(&kin, in))
 262                         return -EFAULT;
 263         } else
 264                 memset(&kin, 0, sizeof(kin));
 265
 266         error = do_setitimer(which, &kin, out ? &kout : NULL);
 267         if (error || !out)
 268                 return error;
 269         if (put_compat_itimerval(out, &kout))
 270                 return -EFAULT;
 271         return 0;
 272 }
 273
 274 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 275 {
 276         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 277 }
 278
 279 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 280 {
 281         if (tbuf) {
 282                 struct tms tms;
 283                 struct compat_tms tmp;
 284
 285                 do_sys_times(&tms);
 286                 /* Convert our struct tms to the compat version. */
 287                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 288                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 289                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 290                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 291                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 292                         return -EFAULT;
 293         }
 294         force_successful_syscall_return();
 295         return compat_jiffies_to_clock_t(jiffies);
 296 }
 297
 298 #ifdef __ARCH_WANT_SYS_SIGPENDING
 299
 300 /*
 301  * Assumption: old_sigset_t and compat_old_sigset_t are both
 302  * types that can be passed to put_user()/get_user().
 303  */
 304
 305 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 306 {
 307         old_sigset_t s;
 308         long ret;
 309         mm_segment_t old_fs = get_fs();
 310
 311         set_fs(KERNEL_DS);
 312         ret = sys_sigpending((old_sigset_t __user *) &s);
 313         set_fs(old_fs);
 314         if (ret == 0)
 315                 ret = put_user(s, set);
 316         return ret;
 317 }
 318
 319 #endif
 320
 321 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 322
 323 /*
 324  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 325  * blocked set of signals to the supplied signal set
 326  */
 327 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 328 {
 329         memcpy(blocked->sig, &set, sizeof(set));
 330 }
 331
 332 asmlinkage long compat_sys_sigprocmask(int how,
 333                                        compat_old_sigset_t __user *nset,
 334                                        compat_old_sigset_t __user *oset)
 335 {
 336         old_sigset_t old_set, new_set;
 337         sigset_t new_blocked;
 338
 339         old_set = current->blocked.sig[0];
 340
 341         if (nset) {
 342                 if (get_user(new_set, nset))
 343                         return -EFAULT;
 344                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 345
 346                 new_blocked = current->blocked;
 347
 348                 switch (how) {
 349                 case SIG_BLOCK:
 350                         sigaddsetmask(&new_blocked, new_set);
 351                         break;
 352                 case SIG_UNBLOCK:
 353                         sigdelsetmask(&new_blocked, new_set);
 354                         break;
 355                 case SIG_SETMASK:
 356                         compat_sig_setmask(&new_blocked, new_set);
 357                         break;
 358                 default:
 359                         return -EINVAL;
 360                 }
 361
 362                 set_current_blocked(&new_blocked);
 363         }
 364
 365         if (oset) {
 366                 if (put_user(old_set, oset))
 367                         return -EFAULT;
 368         }
 369
 370         return 0;
 371 }
 372
 373 #endif
 374
 375 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 376                 struct compat_rlimit __user *rlim)
 377 {
 378         struct rlimit r;
 379
 380         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 381             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 382             __get_user(r.rlim_max, &rlim->rlim_max))
 383                 return -EFAULT;
 384
 385         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 386                 r.rlim_cur = RLIM_INFINITY;
 387         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 388                 r.rlim_max = RLIM_INFINITY;
 389         return do_prlimit(current, resource, &r, NULL);
 390 }
 391
 392 #ifdef COMPAT_RLIM_OLD_INFINITY
 393
 394 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 395                 struct compat_rlimit __user *rlim)
 396 {
 397         struct rlimit r;
 398         int ret;
 399         mm_segment_t old_fs = get_fs();
 400
 401         set_fs(KERNEL_DS);
 402         ret = sys_old_getrlimit(resource, &r);
 403         set_fs(old_fs);
 404
 405         if (!ret) {
 406                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 407                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 408                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 409                         r.rlim_max = COMPAT_RLIM_INFINITY;
 410
 411                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 412                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 413                     __put_user(r.rlim_max, &rlim->rlim_max))
 414                         return -EFAULT;
 415         }
 416         return ret;
 417 }
 418
 419 #endif
 420
 421 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 422                 struct compat_rlimit __user *rlim)
 423 {
 424         struct rlimit r;
 425         int ret;
 426
 427         ret = do_prlimit(current, resource, NULL, &r);
 428         if (!ret) {
 429                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 430                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 431                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 432                         r.rlim_max = COMPAT_RLIM_INFINITY;
 433
 434                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 435                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 436                     __put_user(r.rlim_max, &rlim->rlim_max))
 437                         return -EFAULT;
 438         }
 439         return ret;
 440 }
 441
 442 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 443 {
 444         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 445             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 446             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 447             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 448             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 449             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 450             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 451             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 452             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 453             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 454             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 455             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 456             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 457             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 458             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 459             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 460             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 461             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 462             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 463                 return -EFAULT;
 464         return 0;
 465 }
 466
 467 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 468 {
 469         struct rusage r;
 470         int ret;
 471         mm_segment_t old_fs = get_fs();
 472
 473         set_fs(KERNEL_DS);
 474         ret = sys_getrusage(who, (struct rusage __user *) &r);
 475         set_fs(old_fs);
 476
 477         if (ret)
 478                 return ret;
 479
 480         if (put_compat_rusage(&r, ru))
 481                 return -EFAULT;
 482
 483         return 0;
 484 }
 485
 486 asmlinkage long
 487 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 488         struct compat_rusage __user *ru)
 489 {
 490         if (!ru) {
 491                 return sys_wait4(pid, stat_addr, options, NULL);
 492         } else {
 493                 struct rusage r;
 494                 int ret;
 495                 unsigned int status;
 496                 mm_segment_t old_fs = get_fs();
 497
 498                 set_fs (KERNEL_DS);
 499                 ret = sys_wait4(pid,
 500                                 (stat_addr ?
 501                                  (unsigned int __user *) &status : NULL),
 502                                 options, (struct rusage __user *) &r);
 503                 set_fs (old_fs);
 504
 505                 if (ret > 0) {
 506                         if (put_compat_rusage(&r, ru))
 507                                 return -EFAULT;
 508                         if (stat_addr && put_user(status, stat_addr))
 509                                 return -EFAULT;
 510                 }
 511                 return ret;
 512         }
 513 }
 514
 515 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 516                 struct compat_siginfo __user *uinfo, int options,
 517                 struct compat_rusage __user *uru)
 518 {
 519         siginfo_t info;
 520         struct rusage ru;
 521         long ret;
 522         mm_segment_t old_fs = get_fs();
 523
 524         memset(&info, 0, sizeof(info));
 525
 526         set_fs(KERNEL_DS);
 527         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 528                          uru ? (struct rusage __user *)&ru : NULL);
 529         set_fs(old_fs);
 530
 531         if ((ret < 0) || (info.si_signo == 0))
 532                 return ret;
 533
 534         if (uru) {
 535                 ret = put_compat_rusage(&ru, uru);
 536                 if (ret)
 537                         return ret;
 538         }
 539
 540         BUG_ON(info.si_code & __SI_MASK);
 541         info.si_code |= __SI_CHLD;
 542         return copy_siginfo_to_user32(uinfo, &info);
 543 }
 544
 545 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 546                                     unsigned len, struct cpumask *new_mask)
 547 {
 548         unsigned long *k;
 549
 550         if (len < cpumask_size())
 551                 memset(new_mask, 0, cpumask_size());
 552         else if (len > cpumask_size())
 553                 len = cpumask_size();
 554
 555         k = cpumask_bits(new_mask);
 556         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 557 }
 558
 559 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 560                                              unsigned int len,
 561                                              compat_ulong_t __user *user_mask_ptr)
 562 {
 563         cpumask_var_t new_mask;
 564         int retval;
 565
 566         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 567                 return -ENOMEM;
 568
 569         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 570         if (retval)
 571                 goto out;
 572
 573         retval = sched_setaffinity(pid, new_mask);
 574 out:
 575         free_cpumask_var(new_mask);
 576         return retval;
 577 }
 578
 579 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 580                                              compat_ulong_t __user *user_mask_ptr)
 581 {
 582         int ret;
 583         cpumask_var_t mask;
 584
 585         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 586                 return -EINVAL;
 587         if (len & (sizeof(compat_ulong_t)-1))
 588                 return -EINVAL;
 589
 590         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 591                 return -ENOMEM;
 592
 593         ret = sched_getaffinity(pid, mask);
 594         if (ret == 0) {
 595                 size_t retlen = min_t(size_t, len, cpumask_size());
 596
 597                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 598                         ret = -EFAULT;
 599                 else
 600                         ret = retlen;
 601         }
 602         free_cpumask_var(mask);
 603
 604         return ret;
 605 }
 606
 607 int get_compat_itimerspec(struct itimerspec *dst,
 608                           const struct compat_itimerspec __user *src)
 609 {
 610         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 611             get_compat_timespec(&dst->it_value, &src->it_value))
 612                 return -EFAULT;
 613         return 0;
 614 }
 615
 616 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 617                           const struct itimerspec *src)
 618 {
 619         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 620             put_compat_timespec(&src->it_value, &dst->it_value))
 621                 return -EFAULT;
 622         return 0;
 623 }
 624
 625 long compat_sys_timer_create(clockid_t which_clock,
 626                         struct compat_sigevent __user *timer_event_spec,
 627                         timer_t __user *created_timer_id)
 628 {
 629         struct sigevent __user *event = NULL;
 630
 631         if (timer_event_spec) {
 632                 struct sigevent kevent;
 633
 634                 event = compat_alloc_user_space(sizeof(*event));
 635                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 636                     copy_to_user(event, &kevent, sizeof(*event)))
 637                         return -EFAULT;
 638         }
 639
 640         return sys_timer_create(which_clock, event, created_timer_id);
 641 }
 642
 643 long compat_sys_timer_settime(timer_t timer_id, int flags,
 644                           struct compat_itimerspec __user *new,
 645                           struct compat_itimerspec __user *old)
 646 {
 647         long err;
 648         mm_segment_t oldfs;
 649         struct itimerspec newts, oldts;
 650
 651         if (!new)
 652                 return -EINVAL;
 653         if (get_compat_itimerspec(&newts, new))
 654                 return -EFAULT;
 655         oldfs = get_fs();
 656         set_fs(KERNEL_DS);
 657         err = sys_timer_settime(timer_id, flags,
 658                                 (struct itimerspec __user *) &newts,
 659                                 (struct itimerspec __user *) &oldts);
 660         set_fs(oldfs);
 661         if (!err && old && put_compat_itimerspec(old, &oldts))
 662                 return -EFAULT;
 663         return err;
 664 }
 665
 666 long compat_sys_timer_gettime(timer_t timer_id,
 667                 struct compat_itimerspec __user *setting)
 668 {
 669         long err;
 670         mm_segment_t oldfs;
 671         struct itimerspec ts;
 672
 673         oldfs = get_fs();
 674         set_fs(KERNEL_DS);
 675         err = sys_timer_gettime(timer_id,
 676                                 (struct itimerspec __user *) &ts);
 677         set_fs(oldfs);
 678         if (!err && put_compat_itimerspec(setting, &ts))
 679                 return -EFAULT;
 680         return err;
 681 }
 682
 683 long compat_sys_clock_settime(clockid_t which_clock,
 684                 struct compat_timespec __user *tp)
 685 {
 686         long err;
 687         mm_segment_t oldfs;
 688         struct timespec ts;
 689
 690         if (get_compat_timespec(&ts, tp))
 691                 return -EFAULT;
 692         oldfs = get_fs();
 693         set_fs(KERNEL_DS);
 694         err = sys_clock_settime(which_clock,
 695                                 (struct timespec __user *) &ts);
 696         set_fs(oldfs);
 697         return err;
 698 }
 699
 700 long compat_sys_clock_gettime(clockid_t which_clock,
 701                 struct compat_timespec __user *tp)
 702 {
 703         long err;
 704         mm_segment_t oldfs;
 705         struct timespec ts;
 706
 707         oldfs = get_fs();
 708         set_fs(KERNEL_DS);
 709         err = sys_clock_gettime(which_clock,
 710                                 (struct timespec __user *) &ts);
 711         set_fs(oldfs);
 712         if (!err && put_compat_timespec(&ts, tp))
 713                 return -EFAULT;
 714         return err;
 715 }
 716
 717 long compat_sys_clock_adjtime(clockid_t which_clock,
 718                 struct compat_timex __user *utp)
 719 {
 720         struct timex txc;
 721         mm_segment_t oldfs;
 722         int err, ret;
 723
 724         err = compat_get_timex(&txc, utp);
 725         if (err)
 726                 return err;
 727
 728         oldfs = get_fs();
 729         set_fs(KERNEL_DS);
 730         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 731         set_fs(oldfs);
 732
 733         err = compat_put_timex(utp, &txc);
 734         if (err)
 735                 return err;
 736
 737         return ret;
 738 }
 739
 740 long compat_sys_clock_getres(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         oldfs = get_fs();
 748         set_fs(KERNEL_DS);
 749         err = sys_clock_getres(which_clock,
 750                                (struct timespec __user *) &ts);
 751         set_fs(oldfs);
 752         if (!err && tp && put_compat_timespec(&ts, tp))
 753                 return -EFAULT;
 754         return err;
 755 }
 756
 757 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 758 {
 759         long err;
 760         mm_segment_t oldfs;
 761         struct timespec tu;
 762         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 763
 764         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 765         oldfs = get_fs();
 766         set_fs(KERNEL_DS);
 767         err = clock_nanosleep_restart(restart);
 768         set_fs(oldfs);
 769
 770         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 771             put_compat_timespec(&tu, rmtp))
 772                 return -EFAULT;
 773
 774         if (err == -ERESTART_RESTARTBLOCK) {
 775                 restart->fn = compat_clock_nanosleep_restart;
 776                 restart->nanosleep.compat_rmtp = rmtp;
 777         }
 778         return err;
 779 }
 780
 781 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 782                             struct compat_timespec __user *rqtp,
 783                             struct compat_timespec __user *rmtp)
 784 {
 785         long err;
 786         mm_segment_t oldfs;
 787         struct timespec in, out;
 788         struct restart_block *restart;
 789
 790         if (get_compat_timespec(&in, rqtp))
 791                 return -EFAULT;
 792
 793         oldfs = get_fs();
 794         set_fs(KERNEL_DS);
 795         err = sys_clock_nanosleep(which_clock, flags,
 796                                   (struct timespec __user *) &in,
 797                                   (struct timespec __user *) &out);
 798         set_fs(oldfs);
 799
 800         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 801             put_compat_timespec(&out, rmtp))
 802                 return -EFAULT;
 803
 804         if (err == -ERESTART_RESTARTBLOCK) {
 805                 restart = &current_thread_info()->restart_block;
 806                 restart->fn = compat_clock_nanosleep_restart;
 807                 restart->nanosleep.compat_rmtp = rmtp;
 808         }
 809         return err;
 810 }
 811
 812 /*
 813  * We currently only need the following fields from the sigevent
 814  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 815  * sigev_notify_thread_id).  The others are handled in user mode.
 816  * We also assume that copying sigev_value.sival_int is sufficient
 817  * to keep all the bits of sigev_value.sival_ptr intact.
 818  */
 819 int get_compat_sigevent(struct sigevent *event,
 820                 const struct compat_sigevent __user *u_event)
 821 {
 822         memset(event, 0, sizeof(*event));
 823         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 824                 __get_user(event->sigev_value.sival_int,
 825                         &u_event->sigev_value.sival_int) ||
 826                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 827                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 828                 __get_user(event->sigev_notify_thread_id,
 829                         &u_event->sigev_notify_thread_id))
 830                 ? -EFAULT : 0;
 831 }
 832
 833 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 834                        unsigned long bitmap_size)
 835 {
 836         int i, j;
 837         unsigned long m;
 838         compat_ulong_t um;
 839         unsigned long nr_compat_longs;
 840
 841         /* align bitmap up to nearest compat_long_t boundary */
 842         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 843
 844         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 845                 return -EFAULT;
 846
 847         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 848
 849         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 850                 m = 0;
 851
 852                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 853                         /*
 854                          * We dont want to read past the end of the userspace
 855                          * bitmap. We must however ensure the end of the
 856                          * kernel bitmap is zeroed.
 857                          */
 858                         if (nr_compat_longs-- > 0) {
 859                                 if (__get_user(um, umask))
 860                                         return -EFAULT;
 861                         } else {
 862                                 um = 0;
 863                         }
 864
 865                         umask++;
 866                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 867                 }
 868                 *mask++ = m;
 869         }
 870
 871         return 0;
 872 }
 873
 874 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 875                        unsigned long bitmap_size)
 876 {
 877         int i, j;
 878         unsigned long m;
 879         compat_ulong_t um;
 880         unsigned long nr_compat_longs;
 881
 882         /* align bitmap up to nearest compat_long_t boundary */
 883         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 884
 885         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 886                 return -EFAULT;
 887
 888         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 889
 890         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 891                 m = *mask++;
 892
 893                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 894                         um = m;
 895
 896                         /*
 897                          * We dont want to write past the end of the userspace
 898                          * bitmap.
 899                          */
 900                         if (nr_compat_longs-- > 0) {
 901                                 if (__put_user(um, umask))
 902                                         return -EFAULT;
 903                         }
 904
 905                         umask++;
 906                         m >>= 4*sizeof(um);
 907                         m >>= 4*sizeof(um);
 908                 }
 909         }
 910
 911         return 0;
 912 }
 913
 914 void
 915 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 916 {
 917         switch (_NSIG_WORDS) {
 918         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 919         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 920         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 921         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 922         }
 923 }
 924 EXPORT_SYMBOL_GPL(sigset_from_compat);
 925
 926 asmlinkage long
 927 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 928                 struct compat_siginfo __user *uinfo,
 929                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 930 {
 931         compat_sigset_t s32;
 932         sigset_t s;
 933         struct timespec t;
 934         siginfo_t info;
 935         long ret;
 936
 937         if (sigsetsize != sizeof(sigset_t))
 938                 return -EINVAL;
 939
 940         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 941                 return -EFAULT;
 942         sigset_from_compat(&s, &s32);
 943
 944         if (uts) {
 945                 if (get_compat_timespec(&t, uts))
 946                         return -EFAULT;
 947         }
 948
 949         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 950
 951         if (ret > 0 && uinfo) {
 952                 if (copy_siginfo_to_user32(uinfo, &info))
 953                         ret = -EFAULT;
 954         }
 955
 956         return ret;
 957
 958 }
 959
 960 asmlinkage long
 961 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 962                              struct compat_siginfo __user *uinfo)
 963 {
 964         siginfo_t info;
 965
 966         if (copy_siginfo_from_user32(&info, uinfo))
 967                 return -EFAULT;
 968         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 969 }
 970
 971 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 972
 973 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 974
 975 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 976 {
 977         compat_time_t i;
 978         struct timeval tv;
 979
 980         do_gettimeofday(&tv);
 981         i = tv.tv_sec;
 982
 983         if (tloc) {
 984                 if (put_user(i,tloc))
 985                         return -EFAULT;
 986         }
 987         force_successful_syscall_return();
 988         return i;
 989 }
 990
 991 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 992 {
 993         struct timespec tv;
 994         int err;
 995
 996         if (get_user(tv.tv_sec, tptr))
 997                 return -EFAULT;
 998
 999         tv.tv_nsec = 0;
1000
1001         err = security_settime(&tv, NULL);
1002         if (err)
1003                 return err;
1004
1005         do_settimeofday(&tv);
1006         return 0;
1007 }
1008
1009 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1010
1011 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1012 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1013 {
1014         sigset_t newset;
1015         compat_sigset_t newset32;
1016
1017         /* XXX: Don't preclude handling different sized sigset_t's.  */
1018         if (sigsetsize != sizeof(sigset_t))
1019                 return -EINVAL;
1020
1021         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1022                 return -EFAULT;
1023         sigset_from_compat(&newset, &newset32);
1024         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1025
1026         current->saved_sigmask = current->blocked;
1027         set_current_blocked(&newset);
1028
1029         current->state = TASK_INTERRUPTIBLE;
1030         schedule();
1031         set_restore_sigmask();
1032         return -ERESTARTNOHAND;
1033 }
1034 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1035
1036 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1037 {
1038         struct timex txc;
1039         int err, ret;
1040
1041         err = compat_get_timex(&txc, utp);
1042         if (err)
1043                 return err;
1044
1045         ret = do_adjtimex(&txc);
1046
1047         err = compat_put_timex(utp, &txc);
1048         if (err)
1049                 return err;
1050
1051         return ret;
1052 }
1053
1054 #ifdef CONFIG_NUMA
1055 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1056                 compat_uptr_t __user *pages32,
1057                 const int __user *nodes,
1058                 int __user *status,
1059                 int flags)
1060 {
1061         const void __user * __user *pages;
1062         int i;
1063
1064         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1065         for (i = 0; i < nr_pages; i++) {
1066                 compat_uptr_t p;
1067
1068                 if (get_user(p, pages32 + i) ||
1069                         put_user(compat_ptr(p), pages + i))
1070                         return -EFAULT;
1071         }
1072         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1073 }
1074
1075 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1076                         compat_ulong_t maxnode,
1077                         const compat_ulong_t __user *old_nodes,
1078                         const compat_ulong_t __user *new_nodes)
1079 {
1080         unsigned long __user *old = NULL;
1081         unsigned long __user *new = NULL;
1082         nodemask_t tmp_mask;
1083         unsigned long nr_bits;
1084         unsigned long size;
1085
1086         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1087         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1088         if (old_nodes) {
1089                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1090                         return -EFAULT;
1091                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1092                 if (new_nodes)
1093                         new = old + size / sizeof(unsigned long);
1094                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1095                         return -EFAULT;
1096         }
1097         if (new_nodes) {
1098                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1099                         return -EFAULT;
1100                 if (new == NULL)
1101                         new = compat_alloc_user_space(size);
1102                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1103                         return -EFAULT;
1104         }
1105         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1106 }
1107 #endif
1108
1109 struct compat_sysinfo {
1110         s32 uptime;
1111         u32 loads[3];
1112         u32 totalram;
1113         u32 freeram;
1114         u32 sharedram;
1115         u32 bufferram;
1116         u32 totalswap;
1117         u32 freeswap;
1118         u16 procs;
1119         u16 pad;
1120         u32 totalhigh;
1121         u32 freehigh;
1122         u32 mem_unit;
1123         char _f[20-2*sizeof(u32)-sizeof(int)];
1124 };
1125
1126 asmlinkage long
1127 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1128 {
1129         struct sysinfo s;
1130
1131         do_sysinfo(&s);
1132
1133         /* Check to see if any memory value is too large for 32-bit and scale
1134          *  down if needed
1135          */
1136         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1137                 int bitcount = 0;
1138
1139                 while (s.mem_unit < PAGE_SIZE) {
1140                         s.mem_unit <<= 1;
1141                         bitcount++;
1142                 }
1143
1144                 s.totalram >>= bitcount;
1145                 s.freeram >>= bitcount;
1146                 s.sharedram >>= bitcount;
1147                 s.bufferram >>= bitcount;
1148                 s.totalswap >>= bitcount;
1149                 s.freeswap >>= bitcount;
1150                 s.totalhigh >>= bitcount;
1151                 s.freehigh >>= bitcount;
1152         }
1153
1154         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1155             __put_user (s.uptime, &info->uptime) ||
1156             __put_user (s.loads[0], &info->loads[0]) ||
1157             __put_user (s.loads[1], &info->loads[1]) ||
1158             __put_user (s.loads[2], &info->loads[2]) ||
1159             __put_user (s.totalram, &info->totalram) ||
1160             __put_user (s.freeram, &info->freeram) ||
1161             __put_user (s.sharedram, &info->sharedram) ||
1162             __put_user (s.bufferram, &info->bufferram) ||
1163             __put_user (s.totalswap, &info->totalswap) ||
1164             __put_user (s.freeswap, &info->freeswap) ||
1165             __put_user (s.procs, &info->procs) ||
1166             __put_user (s.totalhigh, &info->totalhigh) ||
1167             __put_user (s.freehigh, &info->freehigh) ||
1168             __put_user (s.mem_unit, &info->mem_unit))
1169                 return -EFAULT;
1170
1171         return 0;
1172 }
1173
1174 /*
1175  * Allocate user-space memory for the duration of a single system call,
1176  * in order to marshall parameters inside a compat thunk.
1177  */
1178 void __user *compat_alloc_user_space(unsigned long len)
1179 {
1180         void __user *ptr;
1181
1182         /* If len would occupy more than half of the entire compat space... */
1183         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1184                 return NULL;
1185
1186         ptr = arch_compat_alloc_user_space(len);
1187
1188         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1189                 return NULL;
1190
1191         return ptr;
1192 }
1193 EXPORT_SYMBOL_GPL(compat_alloc_user_space);