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  * Get/set struct timeval with struct timespec on the native side
  35  */
  36 static int compat_get_timeval_convert(struct timespec *o,
  37                                       struct compat_timeval __user *i)
  38 {
  39         long usec;
  40
  41         if (get_user(o->tv_sec, &i->tv_sec) ||
  42             get_user(usec, &i->tv_usec))
  43                 return -EFAULT;
  44         o->tv_nsec = usec * 1000;
  45         return 0;
  46 }
  47
  48 static int compat_put_timeval_convert(struct compat_timeval __user *o,
  49                                       struct timeval *i)
  50 {
  51         return (put_user(i->tv_sec, &o->tv_sec) ||
  52                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  53 }
  54
  55 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  56 {
  57         memset(txc, 0, sizeof(struct timex));
  58
  59         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  60                         __get_user(txc->modes, &utp->modes) ||
  61                         __get_user(txc->offset, &utp->offset) ||
  62                         __get_user(txc->freq, &utp->freq) ||
  63                         __get_user(txc->maxerror, &utp->maxerror) ||
  64                         __get_user(txc->esterror, &utp->esterror) ||
  65                         __get_user(txc->status, &utp->status) ||
  66                         __get_user(txc->constant, &utp->constant) ||
  67                         __get_user(txc->precision, &utp->precision) ||
  68                         __get_user(txc->tolerance, &utp->tolerance) ||
  69                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  70                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  71                         __get_user(txc->tick, &utp->tick) ||
  72                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  73                         __get_user(txc->jitter, &utp->jitter) ||
  74                         __get_user(txc->shift, &utp->shift) ||
  75                         __get_user(txc->stabil, &utp->stabil) ||
  76                         __get_user(txc->jitcnt, &utp->jitcnt) ||
  77                         __get_user(txc->calcnt, &utp->calcnt) ||
  78                         __get_user(txc->errcnt, &utp->errcnt) ||
  79                         __get_user(txc->stbcnt, &utp->stbcnt))
  80                 return -EFAULT;
  81
  82         return 0;
  83 }
  84
  85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  86 {
  87         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  88                         __put_user(txc->modes, &utp->modes) ||
  89                         __put_user(txc->offset, &utp->offset) ||
  90                         __put_user(txc->freq, &utp->freq) ||
  91                         __put_user(txc->maxerror, &utp->maxerror) ||
  92                         __put_user(txc->esterror, &utp->esterror) ||
  93                         __put_user(txc->status, &utp->status) ||
  94                         __put_user(txc->constant, &utp->constant) ||
  95                         __put_user(txc->precision, &utp->precision) ||
  96                         __put_user(txc->tolerance, &utp->tolerance) ||
  97                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  98                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  99                         __put_user(txc->tick, &utp->tick) ||
 100                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 101                         __put_user(txc->jitter, &utp->jitter) ||
 102                         __put_user(txc->shift, &utp->shift) ||
 103                         __put_user(txc->stabil, &utp->stabil) ||
 104                         __put_user(txc->jitcnt, &utp->jitcnt) ||
 105                         __put_user(txc->calcnt, &utp->calcnt) ||
 106                         __put_user(txc->errcnt, &utp->errcnt) ||
 107                         __put_user(txc->stbcnt, &utp->stbcnt) ||
 108                         __put_user(txc->tai, &utp->tai))
 109                 return -EFAULT;
 110         return 0;
 111 }
 112
 113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 114                 struct timezone __user *tz)
 115 {
 116         if (tv) {
 117                 struct timeval ktv;
 118                 do_gettimeofday(&ktv);
 119                 if (compat_put_timeval_convert(tv, &ktv))
 120                         return -EFAULT;
 121         }
 122         if (tz) {
 123                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 124                         return -EFAULT;
 125         }
 126
 127         return 0;
 128 }
 129
 130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 131                 struct timezone __user *tz)
 132 {
 133         struct timespec kts;
 134         struct timezone ktz;
 135
 136         if (tv) {
 137                 if (compat_get_timeval_convert(&kts, tv))
 138                         return -EFAULT;
 139         }
 140         if (tz) {
 141                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 142                         return -EFAULT;
 143         }
 144
 145         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 146 }
 147
 148 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
 149 {
 150         return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
 151                         __get_user(tv->tv_sec, &ctv->tv_sec) ||
 152                         __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 153 }
 154 EXPORT_SYMBOL_GPL(get_compat_timeval);
 155
 156 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
 157 {
 158         return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
 159                         __put_user(tv->tv_sec, &ctv->tv_sec) ||
 160                         __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 161 }
 162 EXPORT_SYMBOL_GPL(put_compat_timeval);
 163
 164 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 165 {
 166         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 167                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 168                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 169 }
 170 EXPORT_SYMBOL_GPL(get_compat_timespec);
 171
 172 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 173 {
 174         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 175                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 176                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 177 }
 178 EXPORT_SYMBOL_GPL(put_compat_timespec);
 179
 180 int compat_get_timeval(struct timeval *tv, const void __user *utv)
 181 {
 182         if (COMPAT_USE_64BIT_TIME)
 183                 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
 184         else
 185                 return get_compat_timeval(tv, utv);
 186 }
 187 EXPORT_SYMBOL_GPL(compat_get_timeval);
 188
 189 int compat_put_timeval(const struct timeval *tv, void __user *utv)
 190 {
 191         if (COMPAT_USE_64BIT_TIME)
 192                 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
 193         else
 194                 return put_compat_timeval(tv, utv);
 195 }
 196 EXPORT_SYMBOL_GPL(compat_put_timeval);
 197
 198 int compat_get_timespec(struct timespec *ts, const void __user *uts)
 199 {
 200         if (COMPAT_USE_64BIT_TIME)
 201                 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
 202         else
 203                 return get_compat_timespec(ts, uts);
 204 }
 205 EXPORT_SYMBOL_GPL(compat_get_timespec);
 206
 207 int compat_put_timespec(const struct timespec *ts, void __user *uts)
 208 {
 209         if (COMPAT_USE_64BIT_TIME)
 210                 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
 211         else
 212                 return put_compat_timespec(ts, uts);
 213 }
 214 EXPORT_SYMBOL_GPL(compat_put_timespec);
 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) {
 230                 rmtp = restart->nanosleep.compat_rmtp;
 231
 232                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 233                         return -EFAULT;
 234         }
 235
 236         return ret;
 237 }
 238
 239 asmlinkage long compat_sys_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 (get_compat_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         if (ret) {
 260                 struct restart_block *restart
 261                         = &current_thread_info()->restart_block;
 262
 263                 restart->fn = compat_nanosleep_restart;
 264                 restart->nanosleep.compat_rmtp = rmtp;
 265
 266                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 267                         return -EFAULT;
 268         }
 269
 270         return ret;
 271 }
 272
 273 static inline long get_compat_itimerval(struct itimerval *o,
 274                 struct compat_itimerval __user *i)
 275 {
 276         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 277                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 278                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 279                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 280                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 281 }
 282
 283 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 284                 struct itimerval *i)
 285 {
 286         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 287                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 288                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 289                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 290                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 291 }
 292
 293 asmlinkage long compat_sys_getitimer(int which,
 294                 struct compat_itimerval __user *it)
 295 {
 296         struct itimerval kit;
 297         int error;
 298
 299         error = do_getitimer(which, &kit);
 300         if (!error && put_compat_itimerval(it, &kit))
 301                 error = -EFAULT;
 302         return error;
 303 }
 304
 305 asmlinkage long compat_sys_setitimer(int which,
 306                 struct compat_itimerval __user *in,
 307                 struct compat_itimerval __user *out)
 308 {
 309         struct itimerval kin, kout;
 310         int error;
 311
 312         if (in) {
 313                 if (get_compat_itimerval(&kin, in))
 314                         return -EFAULT;
 315         } else
 316                 memset(&kin, 0, sizeof(kin));
 317
 318         error = do_setitimer(which, &kin, out ? &kout : NULL);
 319         if (error || !out)
 320                 return error;
 321         if (put_compat_itimerval(out, &kout))
 322                 return -EFAULT;
 323         return 0;
 324 }
 325
 326 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 327 {
 328         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 329 }
 330
 331 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 332 {
 333         if (tbuf) {
 334                 struct tms tms;
 335                 struct compat_tms tmp;
 336
 337                 do_sys_times(&tms);
 338                 /* Convert our struct tms to the compat version. */
 339                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 340                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 341                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 342                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 343                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 344                         return -EFAULT;
 345         }
 346         force_successful_syscall_return();
 347         return compat_jiffies_to_clock_t(jiffies);
 348 }
 349
 350 #ifdef __ARCH_WANT_SYS_SIGPENDING
 351
 352 /*
 353  * Assumption: old_sigset_t and compat_old_sigset_t are both
 354  * types that can be passed to put_user()/get_user().
 355  */
 356
 357 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 358 {
 359         old_sigset_t s;
 360         long ret;
 361         mm_segment_t old_fs = get_fs();
 362
 363         set_fs(KERNEL_DS);
 364         ret = sys_sigpending((old_sigset_t __user *) &s);
 365         set_fs(old_fs);
 366         if (ret == 0)
 367                 ret = put_user(s, set);
 368         return ret;
 369 }
 370
 371 #endif
 372
 373 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 374
 375 /*
 376  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 377  * blocked set of signals to the supplied signal set
 378  */
 379 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 380 {
 381         memcpy(blocked->sig, &set, sizeof(set));
 382 }
 383
 384 asmlinkage long compat_sys_sigprocmask(int how,
 385                                        compat_old_sigset_t __user *nset,
 386                                        compat_old_sigset_t __user *oset)
 387 {
 388         old_sigset_t old_set, new_set;
 389         sigset_t new_blocked;
 390
 391         old_set = current->blocked.sig[0];
 392
 393         if (nset) {
 394                 if (get_user(new_set, nset))
 395                         return -EFAULT;
 396                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 397
 398                 new_blocked = current->blocked;
 399
 400                 switch (how) {
 401                 case SIG_BLOCK:
 402                         sigaddsetmask(&new_blocked, new_set);
 403                         break;
 404                 case SIG_UNBLOCK:
 405                         sigdelsetmask(&new_blocked, new_set);
 406                         break;
 407                 case SIG_SETMASK:
 408                         compat_sig_setmask(&new_blocked, new_set);
 409                         break;
 410                 default:
 411                         return -EINVAL;
 412                 }
 413
 414                 set_current_blocked(&new_blocked);
 415         }
 416
 417         if (oset) {
 418                 if (put_user(old_set, oset))
 419                         return -EFAULT;
 420         }
 421
 422         return 0;
 423 }
 424
 425 #endif
 426
 427 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 428                 struct compat_rlimit __user *rlim)
 429 {
 430         struct rlimit r;
 431
 432         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 433             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 434             __get_user(r.rlim_max, &rlim->rlim_max))
 435                 return -EFAULT;
 436
 437         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 438                 r.rlim_cur = RLIM_INFINITY;
 439         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 440                 r.rlim_max = RLIM_INFINITY;
 441         return do_prlimit(current, resource, &r, NULL);
 442 }
 443
 444 #ifdef COMPAT_RLIM_OLD_INFINITY
 445
 446 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 447                 struct compat_rlimit __user *rlim)
 448 {
 449         struct rlimit r;
 450         int ret;
 451         mm_segment_t old_fs = get_fs();
 452
 453         set_fs(KERNEL_DS);
 454         ret = sys_old_getrlimit(resource, &r);
 455         set_fs(old_fs);
 456
 457         if (!ret) {
 458                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 459                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 460                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 461                         r.rlim_max = COMPAT_RLIM_INFINITY;
 462
 463                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 464                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 465                     __put_user(r.rlim_max, &rlim->rlim_max))
 466                         return -EFAULT;
 467         }
 468         return ret;
 469 }
 470
 471 #endif
 472
 473 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 474                 struct compat_rlimit __user *rlim)
 475 {
 476         struct rlimit r;
 477         int ret;
 478
 479         ret = do_prlimit(current, resource, NULL, &r);
 480         if (!ret) {
 481                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 482                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 483                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 484                         r.rlim_max = COMPAT_RLIM_INFINITY;
 485
 486                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 487                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 488                     __put_user(r.rlim_max, &rlim->rlim_max))
 489                         return -EFAULT;
 490         }
 491         return ret;
 492 }
 493
 494 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 495 {
 496         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 497             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 498             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 499             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 500             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 501             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 502             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 503             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 504             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 505             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 506             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 507             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 508             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 509             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 510             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 511             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 512             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 513             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 514             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 515                 return -EFAULT;
 516         return 0;
 517 }
 518
 519 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 520 {
 521         struct rusage r;
 522         int ret;
 523         mm_segment_t old_fs = get_fs();
 524
 525         set_fs(KERNEL_DS);
 526         ret = sys_getrusage(who, (struct rusage __user *) &r);
 527         set_fs(old_fs);
 528
 529         if (ret)
 530                 return ret;
 531
 532         if (put_compat_rusage(&r, ru))
 533                 return -EFAULT;
 534
 535         return 0;
 536 }
 537
 538 COMPAT_SYSCALL_DEFINE4(wait4,
 539         compat_pid_t, pid,
 540         compat_uint_t __user *, stat_addr,
 541         int, options,
 542         struct compat_rusage __user *, ru)
 543 {
 544         if (!ru) {
 545                 return sys_wait4(pid, stat_addr, options, NULL);
 546         } else {
 547                 struct rusage r;
 548                 int ret;
 549                 unsigned int status;
 550                 mm_segment_t old_fs = get_fs();
 551
 552                 set_fs (KERNEL_DS);
 553                 ret = sys_wait4(pid,
 554                                 (stat_addr ?
 555                                  (unsigned int __user *) &status : NULL),
 556                                 options, (struct rusage __user *) &r);
 557                 set_fs (old_fs);
 558
 559                 if (ret > 0) {
 560                         if (put_compat_rusage(&r, ru))
 561                                 return -EFAULT;
 562                         if (stat_addr && put_user(status, stat_addr))
 563                                 return -EFAULT;
 564                 }
 565                 return ret;
 566         }
 567 }
 568
 569 COMPAT_SYSCALL_DEFINE5(waitid,
 570                 int, which, compat_pid_t, pid,
 571                 struct compat_siginfo __user *, uinfo, int, options,
 572                 struct compat_rusage __user *, uru)
 573 {
 574         siginfo_t info;
 575         struct rusage ru;
 576         long ret;
 577         mm_segment_t old_fs = get_fs();
 578
 579         memset(&info, 0, sizeof(info));
 580
 581         set_fs(KERNEL_DS);
 582         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 583                          uru ? (struct rusage __user *)&ru : NULL);
 584         set_fs(old_fs);
 585
 586         if ((ret < 0) || (info.si_signo == 0))
 587                 return ret;
 588
 589         if (uru) {
 590                 /* sys_waitid() overwrites everything in ru */
 591                 if (COMPAT_USE_64BIT_TIME)
 592                         ret = copy_to_user(uru, &ru, sizeof(ru));
 593                 else
 594                         ret = put_compat_rusage(&ru, uru);
 595                 if (ret)
 596                         return ret;
 597         }
 598
 599         BUG_ON(info.si_code & __SI_MASK);
 600         info.si_code |= __SI_CHLD;
 601         return copy_siginfo_to_user32(uinfo, &info);
 602 }
 603
 604 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 605                                     unsigned len, struct cpumask *new_mask)
 606 {
 607         unsigned long *k;
 608
 609         if (len < cpumask_size())
 610                 memset(new_mask, 0, cpumask_size());
 611         else if (len > cpumask_size())
 612                 len = cpumask_size();
 613
 614         k = cpumask_bits(new_mask);
 615         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 616 }
 617
 618 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 619                                              unsigned int len,
 620                                              compat_ulong_t __user *user_mask_ptr)
 621 {
 622         cpumask_var_t new_mask;
 623         int retval;
 624
 625         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 626                 return -ENOMEM;
 627
 628         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 629         if (retval)
 630                 goto out;
 631
 632         retval = sched_setaffinity(pid, new_mask);
 633 out:
 634         free_cpumask_var(new_mask);
 635         return retval;
 636 }
 637
 638 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 639                                              compat_ulong_t __user *user_mask_ptr)
 640 {
 641         int ret;
 642         cpumask_var_t mask;
 643
 644         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 645                 return -EINVAL;
 646         if (len & (sizeof(compat_ulong_t)-1))
 647                 return -EINVAL;
 648
 649         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 650                 return -ENOMEM;
 651
 652         ret = sched_getaffinity(pid, mask);
 653         if (ret == 0) {
 654                 size_t retlen = min_t(size_t, len, cpumask_size());
 655
 656                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 657                         ret = -EFAULT;
 658                 else
 659                         ret = retlen;
 660         }
 661         free_cpumask_var(mask);
 662
 663         return ret;
 664 }
 665
 666 int get_compat_itimerspec(struct itimerspec *dst,
 667                           const struct compat_itimerspec __user *src)
 668 {
 669         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 670             get_compat_timespec(&dst->it_value, &src->it_value))
 671                 return -EFAULT;
 672         return 0;
 673 }
 674
 675 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 676                           const struct itimerspec *src)
 677 {
 678         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 679             put_compat_timespec(&src->it_value, &dst->it_value))
 680                 return -EFAULT;
 681         return 0;
 682 }
 683
 684 long compat_sys_timer_create(clockid_t which_clock,
 685                         struct compat_sigevent __user *timer_event_spec,
 686                         timer_t __user *created_timer_id)
 687 {
 688         struct sigevent __user *event = NULL;
 689
 690         if (timer_event_spec) {
 691                 struct sigevent kevent;
 692
 693                 event = compat_alloc_user_space(sizeof(*event));
 694                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 695                     copy_to_user(event, &kevent, sizeof(*event)))
 696                         return -EFAULT;
 697         }
 698
 699         return sys_timer_create(which_clock, event, created_timer_id);
 700 }
 701
 702 long compat_sys_timer_settime(timer_t timer_id, int flags,
 703                           struct compat_itimerspec __user *new,
 704                           struct compat_itimerspec __user *old)
 705 {
 706         long err;
 707         mm_segment_t oldfs;
 708         struct itimerspec newts, oldts;
 709
 710         if (!new)
 711                 return -EINVAL;
 712         if (get_compat_itimerspec(&newts, new))
 713                 return -EFAULT;
 714         oldfs = get_fs();
 715         set_fs(KERNEL_DS);
 716         err = sys_timer_settime(timer_id, flags,
 717                                 (struct itimerspec __user *) &newts,
 718                                 (struct itimerspec __user *) &oldts);
 719         set_fs(oldfs);
 720         if (!err && old && put_compat_itimerspec(old, &oldts))
 721                 return -EFAULT;
 722         return err;
 723 }
 724
 725 long compat_sys_timer_gettime(timer_t timer_id,
 726                 struct compat_itimerspec __user *setting)
 727 {
 728         long err;
 729         mm_segment_t oldfs;
 730         struct itimerspec ts;
 731
 732         oldfs = get_fs();
 733         set_fs(KERNEL_DS);
 734         err = sys_timer_gettime(timer_id,
 735                                 (struct itimerspec __user *) &ts);
 736         set_fs(oldfs);
 737         if (!err && put_compat_itimerspec(setting, &ts))
 738                 return -EFAULT;
 739         return err;
 740 }
 741
 742 long compat_sys_clock_settime(clockid_t which_clock,
 743                 struct compat_timespec __user *tp)
 744 {
 745         long err;
 746         mm_segment_t oldfs;
 747         struct timespec ts;
 748
 749         if (get_compat_timespec(&ts, tp))
 750                 return -EFAULT;
 751         oldfs = get_fs();
 752         set_fs(KERNEL_DS);
 753         err = sys_clock_settime(which_clock,
 754                                 (struct timespec __user *) &ts);
 755         set_fs(oldfs);
 756         return err;
 757 }
 758
 759 long compat_sys_clock_gettime(clockid_t which_clock,
 760                 struct compat_timespec __user *tp)
 761 {
 762         long err;
 763         mm_segment_t oldfs;
 764         struct timespec ts;
 765
 766         oldfs = get_fs();
 767         set_fs(KERNEL_DS);
 768         err = sys_clock_gettime(which_clock,
 769                                 (struct timespec __user *) &ts);
 770         set_fs(oldfs);
 771         if (!err && put_compat_timespec(&ts, tp))
 772                 return -EFAULT;
 773         return err;
 774 }
 775
 776 long compat_sys_clock_adjtime(clockid_t which_clock,
 777                 struct compat_timex __user *utp)
 778 {
 779         struct timex txc;
 780         mm_segment_t oldfs;
 781         int err, ret;
 782
 783         err = compat_get_timex(&txc, utp);
 784         if (err)
 785                 return err;
 786
 787         oldfs = get_fs();
 788         set_fs(KERNEL_DS);
 789         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 790         set_fs(oldfs);
 791
 792         err = compat_put_timex(utp, &txc);
 793         if (err)
 794                 return err;
 795
 796         return ret;
 797 }
 798
 799 long compat_sys_clock_getres(clockid_t which_clock,
 800                 struct compat_timespec __user *tp)
 801 {
 802         long err;
 803         mm_segment_t oldfs;
 804         struct timespec ts;
 805
 806         oldfs = get_fs();
 807         set_fs(KERNEL_DS);
 808         err = sys_clock_getres(which_clock,
 809                                (struct timespec __user *) &ts);
 810         set_fs(oldfs);
 811         if (!err && tp && put_compat_timespec(&ts, tp))
 812                 return -EFAULT;
 813         return err;
 814 }
 815
 816 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 817 {
 818         long err;
 819         mm_segment_t oldfs;
 820         struct timespec tu;
 821         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 822
 823         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 824         oldfs = get_fs();
 825         set_fs(KERNEL_DS);
 826         err = clock_nanosleep_restart(restart);
 827         set_fs(oldfs);
 828
 829         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 830             put_compat_timespec(&tu, rmtp))
 831                 return -EFAULT;
 832
 833         if (err == -ERESTART_RESTARTBLOCK) {
 834                 restart->fn = compat_clock_nanosleep_restart;
 835                 restart->nanosleep.compat_rmtp = rmtp;
 836         }
 837         return err;
 838 }
 839
 840 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 841                             struct compat_timespec __user *rqtp,
 842                             struct compat_timespec __user *rmtp)
 843 {
 844         long err;
 845         mm_segment_t oldfs;
 846         struct timespec in, out;
 847         struct restart_block *restart;
 848
 849         if (get_compat_timespec(&in, rqtp))
 850                 return -EFAULT;
 851
 852         oldfs = get_fs();
 853         set_fs(KERNEL_DS);
 854         err = sys_clock_nanosleep(which_clock, flags,
 855                                   (struct timespec __user *) &in,
 856                                   (struct timespec __user *) &out);
 857         set_fs(oldfs);
 858
 859         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 860             put_compat_timespec(&out, rmtp))
 861                 return -EFAULT;
 862
 863         if (err == -ERESTART_RESTARTBLOCK) {
 864                 restart = &current_thread_info()->restart_block;
 865                 restart->fn = compat_clock_nanosleep_restart;
 866                 restart->nanosleep.compat_rmtp = rmtp;
 867         }
 868         return err;
 869 }
 870
 871 /*
 872  * We currently only need the following fields from the sigevent
 873  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 874  * sigev_notify_thread_id).  The others are handled in user mode.
 875  * We also assume that copying sigev_value.sival_int is sufficient
 876  * to keep all the bits of sigev_value.sival_ptr intact.
 877  */
 878 int get_compat_sigevent(struct sigevent *event,
 879                 const struct compat_sigevent __user *u_event)
 880 {
 881         memset(event, 0, sizeof(*event));
 882         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 883                 __get_user(event->sigev_value.sival_int,
 884                         &u_event->sigev_value.sival_int) ||
 885                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 886                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 887                 __get_user(event->sigev_notify_thread_id,
 888                         &u_event->sigev_notify_thread_id))
 889                 ? -EFAULT : 0;
 890 }
 891
 892 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 893                        unsigned long bitmap_size)
 894 {
 895         int i, j;
 896         unsigned long m;
 897         compat_ulong_t um;
 898         unsigned long nr_compat_longs;
 899
 900         /* align bitmap up to nearest compat_long_t boundary */
 901         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 902
 903         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 904                 return -EFAULT;
 905
 906         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 907
 908         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 909                 m = 0;
 910
 911                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 912                         /*
 913                          * We dont want to read past the end of the userspace
 914                          * bitmap. We must however ensure the end of the
 915                          * kernel bitmap is zeroed.
 916                          */
 917                         if (nr_compat_longs-- > 0) {
 918                                 if (__get_user(um, umask))
 919                                         return -EFAULT;
 920                         } else {
 921                                 um = 0;
 922                         }
 923
 924                         umask++;
 925                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 926                 }
 927                 *mask++ = m;
 928         }
 929
 930         return 0;
 931 }
 932
 933 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 934                        unsigned long bitmap_size)
 935 {
 936         int i, j;
 937         unsigned long m;
 938         compat_ulong_t um;
 939         unsigned long nr_compat_longs;
 940
 941         /* align bitmap up to nearest compat_long_t boundary */
 942         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 943
 944         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 945                 return -EFAULT;
 946
 947         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 948
 949         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 950                 m = *mask++;
 951
 952                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 953                         um = m;
 954
 955                         /*
 956                          * We dont want to write past the end of the userspace
 957                          * bitmap.
 958                          */
 959                         if (nr_compat_longs-- > 0) {
 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, 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 asmlinkage long
 986 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 987                 struct compat_siginfo __user *uinfo,
 988                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 989 {
 990         compat_sigset_t s32;
 991         sigset_t s;
 992         struct timespec t;
 993         siginfo_t info;
 994         long ret;
 995
 996         if (sigsetsize != sizeof(sigset_t))
 997                 return -EINVAL;
 998
 999         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1000                 return -EFAULT;
1001         sigset_from_compat(&s, &s32);
1002
1003         if (uts) {
1004                 if (compat_get_timespec(&t, uts))
1005                         return -EFAULT;
1006         }
1007
1008         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1009
1010         if (ret > 0 && uinfo) {
1011                 if (copy_siginfo_to_user32(uinfo, &info))
1012                         ret = -EFAULT;
1013         }
1014
1015         return ret;
1016
1017 }
1018
1019 asmlinkage long
1020 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
1021                              struct compat_siginfo __user *uinfo)
1022 {
1023         siginfo_t info;
1024
1025         if (copy_siginfo_from_user32(&info, uinfo))
1026                 return -EFAULT;
1027         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
1028 }
1029
1030 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1031
1032 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1033
1034 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1035 {
1036         compat_time_t i;
1037         struct timeval tv;
1038
1039         do_gettimeofday(&tv);
1040         i = tv.tv_sec;
1041
1042         if (tloc) {
1043                 if (put_user(i,tloc))
1044                         return -EFAULT;
1045         }
1046         force_successful_syscall_return();
1047         return i;
1048 }
1049
1050 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1051 {
1052         struct timespec tv;
1053         int err;
1054
1055         if (get_user(tv.tv_sec, tptr))
1056                 return -EFAULT;
1057
1058         tv.tv_nsec = 0;
1059
1060         err = security_settime(&tv, NULL);
1061         if (err)
1062                 return err;
1063
1064         do_settimeofday(&tv);
1065         return 0;
1066 }
1067
1068 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1069
1070 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1071 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1072 {
1073         sigset_t newset;
1074         compat_sigset_t newset32;
1075
1076         /* XXX: Don't preclude handling different sized sigset_t's.  */
1077         if (sigsetsize != sizeof(sigset_t))
1078                 return -EINVAL;
1079
1080         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1081                 return -EFAULT;
1082         sigset_from_compat(&newset, &newset32);
1083         return sigsuspend(&newset);
1084 }
1085 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1086
1087 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1088 {
1089         struct timex txc;
1090         int err, ret;
1091
1092         err = compat_get_timex(&txc, utp);
1093         if (err)
1094                 return err;
1095
1096         ret = do_adjtimex(&txc);
1097
1098         err = compat_put_timex(utp, &txc);
1099         if (err)
1100                 return err;
1101
1102         return ret;
1103 }
1104
1105 #ifdef CONFIG_NUMA
1106 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1107                 compat_uptr_t __user *pages32,
1108                 const int __user *nodes,
1109                 int __user *status,
1110                 int flags)
1111 {
1112         const void __user * __user *pages;
1113         int i;
1114
1115         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1116         for (i = 0; i < nr_pages; i++) {
1117                 compat_uptr_t p;
1118
1119                 if (get_user(p, pages32 + i) ||
1120                         put_user(compat_ptr(p), pages + i))
1121                         return -EFAULT;
1122         }
1123         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1124 }
1125
1126 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1127                         compat_ulong_t maxnode,
1128                         const compat_ulong_t __user *old_nodes,
1129                         const compat_ulong_t __user *new_nodes)
1130 {
1131         unsigned long __user *old = NULL;
1132         unsigned long __user *new = NULL;
1133         nodemask_t tmp_mask;
1134         unsigned long nr_bits;
1135         unsigned long size;
1136
1137         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1138         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1139         if (old_nodes) {
1140                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1141                         return -EFAULT;
1142                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1143                 if (new_nodes)
1144                         new = old + size / sizeof(unsigned long);
1145                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1146                         return -EFAULT;
1147         }
1148         if (new_nodes) {
1149                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1150                         return -EFAULT;
1151                 if (new == NULL)
1152                         new = compat_alloc_user_space(size);
1153                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1154                         return -EFAULT;
1155         }
1156         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1157 }
1158 #endif
1159
1160 struct compat_sysinfo {
1161         s32 uptime;
1162         u32 loads[3];
1163         u32 totalram;
1164         u32 freeram;
1165         u32 sharedram;
1166         u32 bufferram;
1167         u32 totalswap;
1168         u32 freeswap;
1169         u16 procs;
1170         u16 pad;
1171         u32 totalhigh;
1172         u32 freehigh;
1173         u32 mem_unit;
1174         char _f[20-2*sizeof(u32)-sizeof(int)];
1175 };
1176
1177 asmlinkage long
1178 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1179 {
1180         struct sysinfo s;
1181
1182         do_sysinfo(&s);
1183
1184         /* Check to see if any memory value is too large for 32-bit and scale
1185          *  down if needed
1186          */
1187         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1188                 int bitcount = 0;
1189
1190                 while (s.mem_unit < PAGE_SIZE) {
1191                         s.mem_unit <<= 1;
1192                         bitcount++;
1193                 }
1194
1195                 s.totalram >>= bitcount;
1196                 s.freeram >>= bitcount;
1197                 s.sharedram >>= bitcount;
1198                 s.bufferram >>= bitcount;
1199                 s.totalswap >>= bitcount;
1200                 s.freeswap >>= bitcount;
1201                 s.totalhigh >>= bitcount;
1202                 s.freehigh >>= bitcount;
1203         }
1204
1205         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1206             __put_user (s.uptime, &info->uptime) ||
1207             __put_user (s.loads[0], &info->loads[0]) ||
1208             __put_user (s.loads[1], &info->loads[1]) ||
1209             __put_user (s.loads[2], &info->loads[2]) ||
1210             __put_user (s.totalram, &info->totalram) ||
1211             __put_user (s.freeram, &info->freeram) ||
1212             __put_user (s.sharedram, &info->sharedram) ||
1213             __put_user (s.bufferram, &info->bufferram) ||
1214             __put_user (s.totalswap, &info->totalswap) ||
1215             __put_user (s.freeswap, &info->freeswap) ||
1216             __put_user (s.procs, &info->procs) ||
1217             __put_user (s.totalhigh, &info->totalhigh) ||
1218             __put_user (s.freehigh, &info->freehigh) ||
1219             __put_user (s.mem_unit, &info->mem_unit))
1220                 return -EFAULT;
1221
1222         return 0;
1223 }
1224
1225 #ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
1226 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
1227                                                  struct compat_timespec __user *interval)
1228 {
1229         struct timespec t;
1230         int ret;
1231         mm_segment_t old_fs = get_fs();
1232
1233         set_fs(KERNEL_DS);
1234         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1235         set_fs(old_fs);
1236         if (put_compat_timespec(&t, interval))
1237                 return -EFAULT;
1238         return ret;
1239 }
1240 #endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */
1241
1242 /*
1243  * Allocate user-space memory for the duration of a single system call,
1244  * in order to marshall parameters inside a compat thunk.
1245  */
1246 void __user *compat_alloc_user_space(unsigned long len)
1247 {
1248         void __user *ptr;
1249
1250         /* If len would occupy more than half of the entire compat space... */
1251         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1252                 return NULL;
1253
1254         ptr = arch_compat_alloc_user_space(len);
1255
1256         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1257                 return NULL;
1258
1259         return ptr;
1260 }
1261 EXPORT_SYMBOL_GPL(compat_alloc_user_space);