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 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 376                 compat_old_sigset_t __user *oset)
 377 {
 378         old_sigset_t s;
 379         long ret;
 380         mm_segment_t old_fs;
 381
 382         if (set && get_user(s, set))
 383                 return -EFAULT;
 384         old_fs = get_fs();
 385         set_fs(KERNEL_DS);
 386         ret = sys_sigprocmask(how,
 387                               set ? (old_sigset_t __user *) &s : NULL,
 388                               oset ? (old_sigset_t __user *) &s : NULL);
 389         set_fs(old_fs);
 390         if (ret == 0)
 391                 if (oset)
 392                         ret = put_user(s, oset);
 393         return ret;
 394 }
 395
 396 #endif
 397
 398 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 399                 struct compat_rlimit __user *rlim)
 400 {
 401         struct rlimit r;
 402
 403         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 404             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 405             __get_user(r.rlim_max, &rlim->rlim_max))
 406                 return -EFAULT;
 407
 408         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 409                 r.rlim_cur = RLIM_INFINITY;
 410         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 411                 r.rlim_max = RLIM_INFINITY;
 412         return do_prlimit(current, resource, &r, NULL);
 413 }
 414
 415 #ifdef COMPAT_RLIM_OLD_INFINITY
 416
 417 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 418                 struct compat_rlimit __user *rlim)
 419 {
 420         struct rlimit r;
 421         int ret;
 422         mm_segment_t old_fs = get_fs();
 423
 424         set_fs(KERNEL_DS);
 425         ret = sys_old_getrlimit(resource, &r);
 426         set_fs(old_fs);
 427
 428         if (!ret) {
 429                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 430                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 431                 if (r.rlim_max > COMPAT_RLIM_OLD_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 #endif
 443
 444 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 445                 struct compat_rlimit __user *rlim)
 446 {
 447         struct rlimit r;
 448         int ret;
 449
 450         ret = do_prlimit(current, resource, NULL, &r);
 451         if (!ret) {
 452                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 453                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 454                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 455                         r.rlim_max = COMPAT_RLIM_INFINITY;
 456
 457                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 458                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 459                     __put_user(r.rlim_max, &rlim->rlim_max))
 460                         return -EFAULT;
 461         }
 462         return ret;
 463 }
 464
 465 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 466 {
 467         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 468             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 469             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 470             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 471             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 472             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 473             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 474             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 475             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 476             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 477             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 478             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 479             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 480             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 481             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 482             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 483             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 484             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 485             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 486                 return -EFAULT;
 487         return 0;
 488 }
 489
 490 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 491 {
 492         struct rusage r;
 493         int ret;
 494         mm_segment_t old_fs = get_fs();
 495
 496         set_fs(KERNEL_DS);
 497         ret = sys_getrusage(who, (struct rusage __user *) &r);
 498         set_fs(old_fs);
 499
 500         if (ret)
 501                 return ret;
 502
 503         if (put_compat_rusage(&r, ru))
 504                 return -EFAULT;
 505
 506         return 0;
 507 }
 508
 509 asmlinkage long
 510 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 511         struct compat_rusage __user *ru)
 512 {
 513         if (!ru) {
 514                 return sys_wait4(pid, stat_addr, options, NULL);
 515         } else {
 516                 struct rusage r;
 517                 int ret;
 518                 unsigned int status;
 519                 mm_segment_t old_fs = get_fs();
 520
 521                 set_fs (KERNEL_DS);
 522                 ret = sys_wait4(pid,
 523                                 (stat_addr ?
 524                                  (unsigned int __user *) &status : NULL),
 525                                 options, (struct rusage __user *) &r);
 526                 set_fs (old_fs);
 527
 528                 if (ret > 0) {
 529                         if (put_compat_rusage(&r, ru))
 530                                 return -EFAULT;
 531                         if (stat_addr && put_user(status, stat_addr))
 532                                 return -EFAULT;
 533                 }
 534                 return ret;
 535         }
 536 }
 537
 538 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 539                 struct compat_siginfo __user *uinfo, int options,
 540                 struct compat_rusage __user *uru)
 541 {
 542         siginfo_t info;
 543         struct rusage ru;
 544         long ret;
 545         mm_segment_t old_fs = get_fs();
 546
 547         memset(&info, 0, sizeof(info));
 548
 549         set_fs(KERNEL_DS);
 550         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 551                          uru ? (struct rusage __user *)&ru : NULL);
 552         set_fs(old_fs);
 553
 554         if ((ret < 0) || (info.si_signo == 0))
 555                 return ret;
 556
 557         if (uru) {
 558                 ret = put_compat_rusage(&ru, uru);
 559                 if (ret)
 560                         return ret;
 561         }
 562
 563         BUG_ON(info.si_code & __SI_MASK);
 564         info.si_code |= __SI_CHLD;
 565         return copy_siginfo_to_user32(uinfo, &info);
 566 }
 567
 568 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 569                                     unsigned len, struct cpumask *new_mask)
 570 {
 571         unsigned long *k;
 572
 573         if (len < cpumask_size())
 574                 memset(new_mask, 0, cpumask_size());
 575         else if (len > cpumask_size())
 576                 len = cpumask_size();
 577
 578         k = cpumask_bits(new_mask);
 579         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 580 }
 581
 582 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 583                                              unsigned int len,
 584                                              compat_ulong_t __user *user_mask_ptr)
 585 {
 586         cpumask_var_t new_mask;
 587         int retval;
 588
 589         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 590                 return -ENOMEM;
 591
 592         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 593         if (retval)
 594                 goto out;
 595
 596         retval = sched_setaffinity(pid, new_mask);
 597 out:
 598         free_cpumask_var(new_mask);
 599         return retval;
 600 }
 601
 602 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 603                                              compat_ulong_t __user *user_mask_ptr)
 604 {
 605         int ret;
 606         cpumask_var_t mask;
 607
 608         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 609                 return -EINVAL;
 610         if (len & (sizeof(compat_ulong_t)-1))
 611                 return -EINVAL;
 612
 613         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 614                 return -ENOMEM;
 615
 616         ret = sched_getaffinity(pid, mask);
 617         if (ret == 0) {
 618                 size_t retlen = min_t(size_t, len, cpumask_size());
 619
 620                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 621                         ret = -EFAULT;
 622                 else
 623                         ret = retlen;
 624         }
 625         free_cpumask_var(mask);
 626
 627         return ret;
 628 }
 629
 630 int get_compat_itimerspec(struct itimerspec *dst,
 631                           const struct compat_itimerspec __user *src)
 632 {
 633         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 634             get_compat_timespec(&dst->it_value, &src->it_value))
 635                 return -EFAULT;
 636         return 0;
 637 }
 638
 639 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 640                           const struct itimerspec *src)
 641 {
 642         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 643             put_compat_timespec(&src->it_value, &dst->it_value))
 644                 return -EFAULT;
 645         return 0;
 646 }
 647
 648 long compat_sys_timer_create(clockid_t which_clock,
 649                         struct compat_sigevent __user *timer_event_spec,
 650                         timer_t __user *created_timer_id)
 651 {
 652         struct sigevent __user *event = NULL;
 653
 654         if (timer_event_spec) {
 655                 struct sigevent kevent;
 656
 657                 event = compat_alloc_user_space(sizeof(*event));
 658                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 659                     copy_to_user(event, &kevent, sizeof(*event)))
 660                         return -EFAULT;
 661         }
 662
 663         return sys_timer_create(which_clock, event, created_timer_id);
 664 }
 665
 666 long compat_sys_timer_settime(timer_t timer_id, int flags,
 667                           struct compat_itimerspec __user *new,
 668                           struct compat_itimerspec __user *old)
 669 {
 670         long err;
 671         mm_segment_t oldfs;
 672         struct itimerspec newts, oldts;
 673
 674         if (!new)
 675                 return -EINVAL;
 676         if (get_compat_itimerspec(&newts, new))
 677                 return -EFAULT;
 678         oldfs = get_fs();
 679         set_fs(KERNEL_DS);
 680         err = sys_timer_settime(timer_id, flags,
 681                                 (struct itimerspec __user *) &newts,
 682                                 (struct itimerspec __user *) &oldts);
 683         set_fs(oldfs);
 684         if (!err && old && put_compat_itimerspec(old, &oldts))
 685                 return -EFAULT;
 686         return err;
 687 }
 688
 689 long compat_sys_timer_gettime(timer_t timer_id,
 690                 struct compat_itimerspec __user *setting)
 691 {
 692         long err;
 693         mm_segment_t oldfs;
 694         struct itimerspec ts;
 695
 696         oldfs = get_fs();
 697         set_fs(KERNEL_DS);
 698         err = sys_timer_gettime(timer_id,
 699                                 (struct itimerspec __user *) &ts);
 700         set_fs(oldfs);
 701         if (!err && put_compat_itimerspec(setting, &ts))
 702                 return -EFAULT;
 703         return err;
 704 }
 705
 706 long compat_sys_clock_settime(clockid_t which_clock,
 707                 struct compat_timespec __user *tp)
 708 {
 709         long err;
 710         mm_segment_t oldfs;
 711         struct timespec ts;
 712
 713         if (get_compat_timespec(&ts, tp))
 714                 return -EFAULT;
 715         oldfs = get_fs();
 716         set_fs(KERNEL_DS);
 717         err = sys_clock_settime(which_clock,
 718                                 (struct timespec __user *) &ts);
 719         set_fs(oldfs);
 720         return err;
 721 }
 722
 723 long compat_sys_clock_gettime(clockid_t which_clock,
 724                 struct compat_timespec __user *tp)
 725 {
 726         long err;
 727         mm_segment_t oldfs;
 728         struct timespec ts;
 729
 730         oldfs = get_fs();
 731         set_fs(KERNEL_DS);
 732         err = sys_clock_gettime(which_clock,
 733                                 (struct timespec __user *) &ts);
 734         set_fs(oldfs);
 735         if (!err && put_compat_timespec(&ts, tp))
 736                 return -EFAULT;
 737         return err;
 738 }
 739
 740 long compat_sys_clock_adjtime(clockid_t which_clock,
 741                 struct compat_timex __user *utp)
 742 {
 743         struct timex txc;
 744         mm_segment_t oldfs;
 745         int err, ret;
 746
 747         err = compat_get_timex(&txc, utp);
 748         if (err)
 749                 return err;
 750
 751         oldfs = get_fs();
 752         set_fs(KERNEL_DS);
 753         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 754         set_fs(oldfs);
 755
 756         err = compat_put_timex(utp, &txc);
 757         if (err)
 758                 return err;
 759
 760         return ret;
 761 }
 762
 763 long compat_sys_clock_getres(clockid_t which_clock,
 764                 struct compat_timespec __user *tp)
 765 {
 766         long err;
 767         mm_segment_t oldfs;
 768         struct timespec ts;
 769
 770         oldfs = get_fs();
 771         set_fs(KERNEL_DS);
 772         err = sys_clock_getres(which_clock,
 773                                (struct timespec __user *) &ts);
 774         set_fs(oldfs);
 775         if (!err && tp && put_compat_timespec(&ts, tp))
 776                 return -EFAULT;
 777         return err;
 778 }
 779
 780 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 781 {
 782         long err;
 783         mm_segment_t oldfs;
 784         struct timespec tu;
 785         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 786
 787         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 788         oldfs = get_fs();
 789         set_fs(KERNEL_DS);
 790         err = clock_nanosleep_restart(restart);
 791         set_fs(oldfs);
 792
 793         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 794             put_compat_timespec(&tu, rmtp))
 795                 return -EFAULT;
 796
 797         if (err == -ERESTART_RESTARTBLOCK) {
 798                 restart->fn = compat_clock_nanosleep_restart;
 799                 restart->nanosleep.compat_rmtp = rmtp;
 800         }
 801         return err;
 802 }
 803
 804 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 805                             struct compat_timespec __user *rqtp,
 806                             struct compat_timespec __user *rmtp)
 807 {
 808         long err;
 809         mm_segment_t oldfs;
 810         struct timespec in, out;
 811         struct restart_block *restart;
 812
 813         if (get_compat_timespec(&in, rqtp))
 814                 return -EFAULT;
 815
 816         oldfs = get_fs();
 817         set_fs(KERNEL_DS);
 818         err = sys_clock_nanosleep(which_clock, flags,
 819                                   (struct timespec __user *) &in,
 820                                   (struct timespec __user *) &out);
 821         set_fs(oldfs);
 822
 823         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 824             put_compat_timespec(&out, rmtp))
 825                 return -EFAULT;
 826
 827         if (err == -ERESTART_RESTARTBLOCK) {
 828                 restart = &current_thread_info()->restart_block;
 829                 restart->fn = compat_clock_nanosleep_restart;
 830                 restart->nanosleep.compat_rmtp = rmtp;
 831         }
 832         return err;
 833 }
 834
 835 /*
 836  * We currently only need the following fields from the sigevent
 837  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 838  * sigev_notify_thread_id).  The others are handled in user mode.
 839  * We also assume that copying sigev_value.sival_int is sufficient
 840  * to keep all the bits of sigev_value.sival_ptr intact.
 841  */
 842 int get_compat_sigevent(struct sigevent *event,
 843                 const struct compat_sigevent __user *u_event)
 844 {
 845         memset(event, 0, sizeof(*event));
 846         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 847                 __get_user(event->sigev_value.sival_int,
 848                         &u_event->sigev_value.sival_int) ||
 849                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 850                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 851                 __get_user(event->sigev_notify_thread_id,
 852                         &u_event->sigev_notify_thread_id))
 853                 ? -EFAULT : 0;
 854 }
 855
 856 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 857                        unsigned long bitmap_size)
 858 {
 859         int i, j;
 860         unsigned long m;
 861         compat_ulong_t um;
 862         unsigned long nr_compat_longs;
 863
 864         /* align bitmap up to nearest compat_long_t boundary */
 865         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 866
 867         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 868                 return -EFAULT;
 869
 870         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 871
 872         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 873                 m = 0;
 874
 875                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 876                         /*
 877                          * We dont want to read past the end of the userspace
 878                          * bitmap. We must however ensure the end of the
 879                          * kernel bitmap is zeroed.
 880                          */
 881                         if (nr_compat_longs-- > 0) {
 882                                 if (__get_user(um, umask))
 883                                         return -EFAULT;
 884                         } else {
 885                                 um = 0;
 886                         }
 887
 888                         umask++;
 889                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 890                 }
 891                 *mask++ = m;
 892         }
 893
 894         return 0;
 895 }
 896
 897 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 898                        unsigned long bitmap_size)
 899 {
 900         int i, j;
 901         unsigned long m;
 902         compat_ulong_t um;
 903         unsigned long nr_compat_longs;
 904
 905         /* align bitmap up to nearest compat_long_t boundary */
 906         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 907
 908         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 909                 return -EFAULT;
 910
 911         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 912
 913         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 914                 m = *mask++;
 915
 916                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 917                         um = m;
 918
 919                         /*
 920                          * We dont want to write past the end of the userspace
 921                          * bitmap.
 922                          */
 923                         if (nr_compat_longs-- > 0) {
 924                                 if (__put_user(um, umask))
 925                                         return -EFAULT;
 926                         }
 927
 928                         umask++;
 929                         m >>= 4*sizeof(um);
 930                         m >>= 4*sizeof(um);
 931                 }
 932         }
 933
 934         return 0;
 935 }
 936
 937 void
 938 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 939 {
 940         switch (_NSIG_WORDS) {
 941         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 942         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 943         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 944         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 945         }
 946 }
 947 EXPORT_SYMBOL_GPL(sigset_from_compat);
 948
 949 asmlinkage long
 950 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 951                 struct compat_siginfo __user *uinfo,
 952                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 953 {
 954         compat_sigset_t s32;
 955         sigset_t s;
 956         struct timespec t;
 957         siginfo_t info;
 958         long ret;
 959
 960         if (sigsetsize != sizeof(sigset_t))
 961                 return -EINVAL;
 962
 963         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 964                 return -EFAULT;
 965         sigset_from_compat(&s, &s32);
 966
 967         if (uts) {
 968                 if (get_compat_timespec(&t, uts))
 969                         return -EFAULT;
 970         }
 971
 972         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 973
 974         if (ret > 0 && uinfo) {
 975                 if (copy_siginfo_to_user32(uinfo, &info))
 976                         ret = -EFAULT;
 977         }
 978
 979         return ret;
 980
 981 }
 982
 983 asmlinkage long
 984 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 985                              struct compat_siginfo __user *uinfo)
 986 {
 987         siginfo_t info;
 988
 989         if (copy_siginfo_from_user32(&info, uinfo))
 990                 return -EFAULT;
 991         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 992 }
 993
 994 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 995
 996 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 997
 998 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 999 {
1000         compat_time_t i;
1001         struct timeval tv;
1002
1003         do_gettimeofday(&tv);
1004         i = tv.tv_sec;
1005
1006         if (tloc) {
1007                 if (put_user(i,tloc))
1008                         return -EFAULT;
1009         }
1010         force_successful_syscall_return();
1011         return i;
1012 }
1013
1014 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1015 {
1016         struct timespec tv;
1017         int err;
1018
1019         if (get_user(tv.tv_sec, tptr))
1020                 return -EFAULT;
1021
1022         tv.tv_nsec = 0;
1023
1024         err = security_settime(&tv, NULL);
1025         if (err)
1026                 return err;
1027
1028         do_settimeofday(&tv);
1029         return 0;
1030 }
1031
1032 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1033
1034 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1035 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1036 {
1037         sigset_t newset;
1038         compat_sigset_t newset32;
1039
1040         /* XXX: Don't preclude handling different sized sigset_t's.  */
1041         if (sigsetsize != sizeof(sigset_t))
1042                 return -EINVAL;
1043
1044         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1045                 return -EFAULT;
1046         sigset_from_compat(&newset, &newset32);
1047         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1048
1049         current->saved_sigmask = current->blocked;
1050         set_current_blocked(&newset);
1051
1052         current->state = TASK_INTERRUPTIBLE;
1053         schedule();
1054         set_restore_sigmask();
1055         return -ERESTARTNOHAND;
1056 }
1057 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1058
1059 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1060 {
1061         struct timex txc;
1062         int err, ret;
1063
1064         err = compat_get_timex(&txc, utp);
1065         if (err)
1066                 return err;
1067
1068         ret = do_adjtimex(&txc);
1069
1070         err = compat_put_timex(utp, &txc);
1071         if (err)
1072                 return err;
1073
1074         return ret;
1075 }
1076
1077 #ifdef CONFIG_NUMA
1078 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1079                 compat_uptr_t __user *pages32,
1080                 const int __user *nodes,
1081                 int __user *status,
1082                 int flags)
1083 {
1084         const void __user * __user *pages;
1085         int i;
1086
1087         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1088         for (i = 0; i < nr_pages; i++) {
1089                 compat_uptr_t p;
1090
1091                 if (get_user(p, pages32 + i) ||
1092                         put_user(compat_ptr(p), pages + i))
1093                         return -EFAULT;
1094         }
1095         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1096 }
1097
1098 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1099                         compat_ulong_t maxnode,
1100                         const compat_ulong_t __user *old_nodes,
1101                         const compat_ulong_t __user *new_nodes)
1102 {
1103         unsigned long __user *old = NULL;
1104         unsigned long __user *new = NULL;
1105         nodemask_t tmp_mask;
1106         unsigned long nr_bits;
1107         unsigned long size;
1108
1109         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1110         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1111         if (old_nodes) {
1112                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1113                         return -EFAULT;
1114                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1115                 if (new_nodes)
1116                         new = old + size / sizeof(unsigned long);
1117                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1118                         return -EFAULT;
1119         }
1120         if (new_nodes) {
1121                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1122                         return -EFAULT;
1123                 if (new == NULL)
1124                         new = compat_alloc_user_space(size);
1125                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1126                         return -EFAULT;
1127         }
1128         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1129 }
1130 #endif
1131
1132 struct compat_sysinfo {
1133         s32 uptime;
1134         u32 loads[3];
1135         u32 totalram;
1136         u32 freeram;
1137         u32 sharedram;
1138         u32 bufferram;
1139         u32 totalswap;
1140         u32 freeswap;
1141         u16 procs;
1142         u16 pad;
1143         u32 totalhigh;
1144         u32 freehigh;
1145         u32 mem_unit;
1146         char _f[20-2*sizeof(u32)-sizeof(int)];
1147 };
1148
1149 asmlinkage long
1150 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1151 {
1152         struct sysinfo s;
1153
1154         do_sysinfo(&s);
1155
1156         /* Check to see if any memory value is too large for 32-bit and scale
1157          *  down if needed
1158          */
1159         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1160                 int bitcount = 0;
1161
1162                 while (s.mem_unit < PAGE_SIZE) {
1163                         s.mem_unit <<= 1;
1164                         bitcount++;
1165                 }
1166
1167                 s.totalram >>= bitcount;
1168                 s.freeram >>= bitcount;
1169                 s.sharedram >>= bitcount;
1170                 s.bufferram >>= bitcount;
1171                 s.totalswap >>= bitcount;
1172                 s.freeswap >>= bitcount;
1173                 s.totalhigh >>= bitcount;
1174                 s.freehigh >>= bitcount;
1175         }
1176
1177         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1178             __put_user (s.uptime, &info->uptime) ||
1179             __put_user (s.loads[0], &info->loads[0]) ||
1180             __put_user (s.loads[1], &info->loads[1]) ||
1181             __put_user (s.loads[2], &info->loads[2]) ||
1182             __put_user (s.totalram, &info->totalram) ||
1183             __put_user (s.freeram, &info->freeram) ||
1184             __put_user (s.sharedram, &info->sharedram) ||
1185             __put_user (s.bufferram, &info->bufferram) ||
1186             __put_user (s.totalswap, &info->totalswap) ||
1187             __put_user (s.freeswap, &info->freeswap) ||
1188             __put_user (s.procs, &info->procs) ||
1189             __put_user (s.totalhigh, &info->totalhigh) ||
1190             __put_user (s.freehigh, &info->freehigh) ||
1191             __put_user (s.mem_unit, &info->mem_unit))
1192                 return -EFAULT;
1193
1194         return 0;
1195 }
1196
1197 /*
1198  * Allocate user-space memory for the duration of a single system call,
1199  * in order to marshall parameters inside a compat thunk.
1200  */
1201 void __user *compat_alloc_user_space(unsigned long len)
1202 {
1203         void __user *ptr;
1204
1205         /* If len would occupy more than half of the entire compat space... */
1206         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1207                 return NULL;
1208
1209         ptr = arch_compat_alloc_user_space(len);
1210
1211         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1212                 return NULL;
1213
1214         return ptr;
1215 }
1216 EXPORT_SYMBOL_GPL(compat_alloc_user_space);