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/migrate.h>
  25 #include <linux/posix-timers.h>
  26 #include <linux/times.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/gfp.h>
  29
  30 #include <asm/uaccess.h>
  31
  32 /*
  33  * Note that the native side is already converted to a timespec, because
  34  * that's what we want anyway.
  35  */
  36 static int compat_get_timeval(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(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(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(&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_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 149 {
 150         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 151                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 152                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 153 }
 154
 155 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 156 {
 157         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 158                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 159                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 160 }
 161
 162 static long compat_nanosleep_restart(struct restart_block *restart)
 163 {
 164         struct compat_timespec __user *rmtp;
 165         struct timespec rmt;
 166         mm_segment_t oldfs;
 167         long ret;
 168
 169         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 170         oldfs = get_fs();
 171         set_fs(KERNEL_DS);
 172         ret = hrtimer_nanosleep_restart(restart);
 173         set_fs(oldfs);
 174
 175         if (ret) {
 176                 rmtp = restart->nanosleep.compat_rmtp;
 177
 178                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 179                         return -EFAULT;
 180         }
 181
 182         return ret;
 183 }
 184
 185 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 186                                      struct compat_timespec __user *rmtp)
 187 {
 188         struct timespec tu, rmt;
 189         mm_segment_t oldfs;
 190         long ret;
 191
 192         if (get_compat_timespec(&tu, rqtp))
 193                 return -EFAULT;
 194
 195         if (!timespec_valid(&tu))
 196                 return -EINVAL;
 197
 198         oldfs = get_fs();
 199         set_fs(KERNEL_DS);
 200         ret = hrtimer_nanosleep(&tu,
 201                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 202                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 203         set_fs(oldfs);
 204
 205         if (ret) {
 206                 struct restart_block *restart
 207                         = &current_thread_info()->restart_block;
 208
 209                 restart->fn = compat_nanosleep_restart;
 210                 restart->nanosleep.compat_rmtp = rmtp;
 211
 212                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 213                         return -EFAULT;
 214         }
 215
 216         return ret;
 217 }
 218
 219 static inline long get_compat_itimerval(struct itimerval *o,
 220                 struct compat_itimerval __user *i)
 221 {
 222         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 223                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 224                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 225                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 226                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 227 }
 228
 229 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 230                 struct itimerval *i)
 231 {
 232         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 233                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 234                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 235                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 236                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 237 }
 238
 239 asmlinkage long compat_sys_getitimer(int which,
 240                 struct compat_itimerval __user *it)
 241 {
 242         struct itimerval kit;
 243         int error;
 244
 245         error = do_getitimer(which, &kit);
 246         if (!error && put_compat_itimerval(it, &kit))
 247                 error = -EFAULT;
 248         return error;
 249 }
 250
 251 asmlinkage long compat_sys_setitimer(int which,
 252                 struct compat_itimerval __user *in,
 253                 struct compat_itimerval __user *out)
 254 {
 255         struct itimerval kin, kout;
 256         int error;
 257
 258         if (in) {
 259                 if (get_compat_itimerval(&kin, in))
 260                         return -EFAULT;
 261         } else
 262                 memset(&kin, 0, sizeof(kin));
 263
 264         error = do_setitimer(which, &kin, out ? &kout : NULL);
 265         if (error || !out)
 266                 return error;
 267         if (put_compat_itimerval(out, &kout))
 268                 return -EFAULT;
 269         return 0;
 270 }
 271
 272 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 273 {
 274         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 275 }
 276
 277 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 278 {
 279         if (tbuf) {
 280                 struct tms tms;
 281                 struct compat_tms tmp;
 282
 283                 do_sys_times(&tms);
 284                 /* Convert our struct tms to the compat version. */
 285                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 286                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 287                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 288                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 289                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 290                         return -EFAULT;
 291         }
 292         force_successful_syscall_return();
 293         return compat_jiffies_to_clock_t(jiffies);
 294 }
 295
 296 #ifdef __ARCH_WANT_SYS_SIGPENDING
 297
 298 /*
 299  * Assumption: old_sigset_t and compat_old_sigset_t are both
 300  * types that can be passed to put_user()/get_user().
 301  */
 302
 303 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 304 {
 305         old_sigset_t s;
 306         long ret;
 307         mm_segment_t old_fs = get_fs();
 308
 309         set_fs(KERNEL_DS);
 310         ret = sys_sigpending((old_sigset_t __user *) &s);
 311         set_fs(old_fs);
 312         if (ret == 0)
 313                 ret = put_user(s, set);
 314         return ret;
 315 }
 316
 317 #endif
 318
 319 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 320
 321 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 322                 compat_old_sigset_t __user *oset)
 323 {
 324         old_sigset_t s;
 325         long ret;
 326         mm_segment_t old_fs;
 327
 328         if (set && get_user(s, set))
 329                 return -EFAULT;
 330         old_fs = get_fs();
 331         set_fs(KERNEL_DS);
 332         ret = sys_sigprocmask(how,
 333                               set ? (old_sigset_t __user *) &s : NULL,
 334                               oset ? (old_sigset_t __user *) &s : NULL);
 335         set_fs(old_fs);
 336         if (ret == 0)
 337                 if (oset)
 338                         ret = put_user(s, oset);
 339         return ret;
 340 }
 341
 342 #endif
 343
 344 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 345                 struct compat_rlimit __user *rlim)
 346 {
 347         struct rlimit r;
 348
 349         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 350             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 351             __get_user(r.rlim_max, &rlim->rlim_max))
 352                 return -EFAULT;
 353
 354         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 355                 r.rlim_cur = RLIM_INFINITY;
 356         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 357                 r.rlim_max = RLIM_INFINITY;
 358         return do_prlimit(current, resource, &r, NULL);
 359 }
 360
 361 #ifdef COMPAT_RLIM_OLD_INFINITY
 362
 363 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 364                 struct compat_rlimit __user *rlim)
 365 {
 366         struct rlimit r;
 367         int ret;
 368         mm_segment_t old_fs = get_fs();
 369
 370         set_fs(KERNEL_DS);
 371         ret = sys_old_getrlimit(resource, &r);
 372         set_fs(old_fs);
 373
 374         if (!ret) {
 375                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 376                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 377                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 378                         r.rlim_max = COMPAT_RLIM_INFINITY;
 379
 380                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 381                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 382                     __put_user(r.rlim_max, &rlim->rlim_max))
 383                         return -EFAULT;
 384         }
 385         return ret;
 386 }
 387
 388 #endif
 389
 390 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 391                 struct compat_rlimit __user *rlim)
 392 {
 393         struct rlimit r;
 394         int ret;
 395
 396         ret = do_prlimit(current, resource, NULL, &r);
 397         if (!ret) {
 398                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 399                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 400                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 401                         r.rlim_max = COMPAT_RLIM_INFINITY;
 402
 403                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 404                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 405                     __put_user(r.rlim_max, &rlim->rlim_max))
 406                         return -EFAULT;
 407         }
 408         return ret;
 409 }
 410
 411 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 412 {
 413         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 414             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 415             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 416             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 417             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 418             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 419             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 420             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 421             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 422             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 423             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 424             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 425             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 426             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 427             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 428             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 429             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 430             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 431             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 432                 return -EFAULT;
 433         return 0;
 434 }
 435
 436 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 437 {
 438         struct rusage r;
 439         int ret;
 440         mm_segment_t old_fs = get_fs();
 441
 442         set_fs(KERNEL_DS);
 443         ret = sys_getrusage(who, (struct rusage __user *) &r);
 444         set_fs(old_fs);
 445
 446         if (ret)
 447                 return ret;
 448
 449         if (put_compat_rusage(&r, ru))
 450                 return -EFAULT;
 451
 452         return 0;
 453 }
 454
 455 asmlinkage long
 456 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 457         struct compat_rusage __user *ru)
 458 {
 459         if (!ru) {
 460                 return sys_wait4(pid, stat_addr, options, NULL);
 461         } else {
 462                 struct rusage r;
 463                 int ret;
 464                 unsigned int status;
 465                 mm_segment_t old_fs = get_fs();
 466
 467                 set_fs (KERNEL_DS);
 468                 ret = sys_wait4(pid,
 469                                 (stat_addr ?
 470                                  (unsigned int __user *) &status : NULL),
 471                                 options, (struct rusage __user *) &r);
 472                 set_fs (old_fs);
 473
 474                 if (ret > 0) {
 475                         if (put_compat_rusage(&r, ru))
 476                                 return -EFAULT;
 477                         if (stat_addr && put_user(status, stat_addr))
 478                                 return -EFAULT;
 479                 }
 480                 return ret;
 481         }
 482 }
 483
 484 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 485                 struct compat_siginfo __user *uinfo, int options,
 486                 struct compat_rusage __user *uru)
 487 {
 488         siginfo_t info;
 489         struct rusage ru;
 490         long ret;
 491         mm_segment_t old_fs = get_fs();
 492
 493         memset(&info, 0, sizeof(info));
 494
 495         set_fs(KERNEL_DS);
 496         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 497                          uru ? (struct rusage __user *)&ru : NULL);
 498         set_fs(old_fs);
 499
 500         if ((ret < 0) || (info.si_signo == 0))
 501                 return ret;
 502
 503         if (uru) {
 504                 ret = put_compat_rusage(&ru, uru);
 505                 if (ret)
 506                         return ret;
 507         }
 508
 509         BUG_ON(info.si_code & __SI_MASK);
 510         info.si_code |= __SI_CHLD;
 511         return copy_siginfo_to_user32(uinfo, &info);
 512 }
 513
 514 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 515                                     unsigned len, struct cpumask *new_mask)
 516 {
 517         unsigned long *k;
 518
 519         if (len < cpumask_size())
 520                 memset(new_mask, 0, cpumask_size());
 521         else if (len > cpumask_size())
 522                 len = cpumask_size();
 523
 524         k = cpumask_bits(new_mask);
 525         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 526 }
 527
 528 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 529                                              unsigned int len,
 530                                              compat_ulong_t __user *user_mask_ptr)
 531 {
 532         cpumask_var_t new_mask;
 533         int retval;
 534
 535         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 536                 return -ENOMEM;
 537
 538         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 539         if (retval)
 540                 goto out;
 541
 542         retval = sched_setaffinity(pid, new_mask);
 543 out:
 544         free_cpumask_var(new_mask);
 545         return retval;
 546 }
 547
 548 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 549                                              compat_ulong_t __user *user_mask_ptr)
 550 {
 551         int ret;
 552         cpumask_var_t mask;
 553
 554         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 555                 return -EINVAL;
 556         if (len & (sizeof(compat_ulong_t)-1))
 557                 return -EINVAL;
 558
 559         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 560                 return -ENOMEM;
 561
 562         ret = sched_getaffinity(pid, mask);
 563         if (ret == 0) {
 564                 size_t retlen = min_t(size_t, len, cpumask_size());
 565
 566                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 567                         ret = -EFAULT;
 568                 else
 569                         ret = retlen;
 570         }
 571         free_cpumask_var(mask);
 572
 573         return ret;
 574 }
 575
 576 int get_compat_itimerspec(struct itimerspec *dst,
 577                           const struct compat_itimerspec __user *src)
 578 {
 579         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 580             get_compat_timespec(&dst->it_value, &src->it_value))
 581                 return -EFAULT;
 582         return 0;
 583 }
 584
 585 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 586                           const struct itimerspec *src)
 587 {
 588         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 589             put_compat_timespec(&src->it_value, &dst->it_value))
 590                 return -EFAULT;
 591         return 0;
 592 }
 593
 594 long compat_sys_timer_create(clockid_t which_clock,
 595                         struct compat_sigevent __user *timer_event_spec,
 596                         timer_t __user *created_timer_id)
 597 {
 598         struct sigevent __user *event = NULL;
 599
 600         if (timer_event_spec) {
 601                 struct sigevent kevent;
 602
 603                 event = compat_alloc_user_space(sizeof(*event));
 604                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 605                     copy_to_user(event, &kevent, sizeof(*event)))
 606                         return -EFAULT;
 607         }
 608
 609         return sys_timer_create(which_clock, event, created_timer_id);
 610 }
 611
 612 long compat_sys_timer_settime(timer_t timer_id, int flags,
 613                           struct compat_itimerspec __user *new,
 614                           struct compat_itimerspec __user *old)
 615 {
 616         long err;
 617         mm_segment_t oldfs;
 618         struct itimerspec newts, oldts;
 619
 620         if (!new)
 621                 return -EINVAL;
 622         if (get_compat_itimerspec(&newts, new))
 623                 return -EFAULT;
 624         oldfs = get_fs();
 625         set_fs(KERNEL_DS);
 626         err = sys_timer_settime(timer_id, flags,
 627                                 (struct itimerspec __user *) &newts,
 628                                 (struct itimerspec __user *) &oldts);
 629         set_fs(oldfs);
 630         if (!err && old && put_compat_itimerspec(old, &oldts))
 631                 return -EFAULT;
 632         return err;
 633 }
 634
 635 long compat_sys_timer_gettime(timer_t timer_id,
 636                 struct compat_itimerspec __user *setting)
 637 {
 638         long err;
 639         mm_segment_t oldfs;
 640         struct itimerspec ts;
 641
 642         oldfs = get_fs();
 643         set_fs(KERNEL_DS);
 644         err = sys_timer_gettime(timer_id,
 645                                 (struct itimerspec __user *) &ts);
 646         set_fs(oldfs);
 647         if (!err && put_compat_itimerspec(setting, &ts))
 648                 return -EFAULT;
 649         return err;
 650 }
 651
 652 long compat_sys_clock_settime(clockid_t which_clock,
 653                 struct compat_timespec __user *tp)
 654 {
 655         long err;
 656         mm_segment_t oldfs;
 657         struct timespec ts;
 658
 659         if (get_compat_timespec(&ts, tp))
 660                 return -EFAULT;
 661         oldfs = get_fs();
 662         set_fs(KERNEL_DS);
 663         err = sys_clock_settime(which_clock,
 664                                 (struct timespec __user *) &ts);
 665         set_fs(oldfs);
 666         return err;
 667 }
 668
 669 long compat_sys_clock_gettime(clockid_t which_clock,
 670                 struct compat_timespec __user *tp)
 671 {
 672         long err;
 673         mm_segment_t oldfs;
 674         struct timespec ts;
 675
 676         oldfs = get_fs();
 677         set_fs(KERNEL_DS);
 678         err = sys_clock_gettime(which_clock,
 679                                 (struct timespec __user *) &ts);
 680         set_fs(oldfs);
 681         if (!err && put_compat_timespec(&ts, tp))
 682                 return -EFAULT;
 683         return err;
 684 }
 685
 686 long compat_sys_clock_adjtime(clockid_t which_clock,
 687                 struct compat_timex __user *utp)
 688 {
 689         struct timex txc;
 690         mm_segment_t oldfs;
 691         int err, ret;
 692
 693         err = compat_get_timex(&txc, utp);
 694         if (err)
 695                 return err;
 696
 697         oldfs = get_fs();
 698         set_fs(KERNEL_DS);
 699         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 700         set_fs(oldfs);
 701
 702         err = compat_put_timex(utp, &txc);
 703         if (err)
 704                 return err;
 705
 706         return ret;
 707 }
 708
 709 long compat_sys_clock_getres(clockid_t which_clock,
 710                 struct compat_timespec __user *tp)
 711 {
 712         long err;
 713         mm_segment_t oldfs;
 714         struct timespec ts;
 715
 716         oldfs = get_fs();
 717         set_fs(KERNEL_DS);
 718         err = sys_clock_getres(which_clock,
 719                                (struct timespec __user *) &ts);
 720         set_fs(oldfs);
 721         if (!err && tp && put_compat_timespec(&ts, tp))
 722                 return -EFAULT;
 723         return err;
 724 }
 725
 726 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 727 {
 728         long err;
 729         mm_segment_t oldfs;
 730         struct timespec tu;
 731         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 732
 733         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 734         oldfs = get_fs();
 735         set_fs(KERNEL_DS);
 736         err = clock_nanosleep_restart(restart);
 737         set_fs(oldfs);
 738
 739         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 740             put_compat_timespec(&tu, rmtp))
 741                 return -EFAULT;
 742
 743         if (err == -ERESTART_RESTARTBLOCK) {
 744                 restart->fn = compat_clock_nanosleep_restart;
 745                 restart->nanosleep.compat_rmtp = rmtp;
 746         }
 747         return err;
 748 }
 749
 750 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 751                             struct compat_timespec __user *rqtp,
 752                             struct compat_timespec __user *rmtp)
 753 {
 754         long err;
 755         mm_segment_t oldfs;
 756         struct timespec in, out;
 757         struct restart_block *restart;
 758
 759         if (get_compat_timespec(&in, rqtp))
 760                 return -EFAULT;
 761
 762         oldfs = get_fs();
 763         set_fs(KERNEL_DS);
 764         err = sys_clock_nanosleep(which_clock, flags,
 765                                   (struct timespec __user *) &in,
 766                                   (struct timespec __user *) &out);
 767         set_fs(oldfs);
 768
 769         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 770             put_compat_timespec(&out, rmtp))
 771                 return -EFAULT;
 772
 773         if (err == -ERESTART_RESTARTBLOCK) {
 774                 restart = &current_thread_info()->restart_block;
 775                 restart->fn = compat_clock_nanosleep_restart;
 776                 restart->nanosleep.compat_rmtp = rmtp;
 777         }
 778         return err;
 779 }
 780
 781 /*
 782  * We currently only need the following fields from the sigevent
 783  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 784  * sigev_notify_thread_id).  The others are handled in user mode.
 785  * We also assume that copying sigev_value.sival_int is sufficient
 786  * to keep all the bits of sigev_value.sival_ptr intact.
 787  */
 788 int get_compat_sigevent(struct sigevent *event,
 789                 const struct compat_sigevent __user *u_event)
 790 {
 791         memset(event, 0, sizeof(*event));
 792         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 793                 __get_user(event->sigev_value.sival_int,
 794                         &u_event->sigev_value.sival_int) ||
 795                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 796                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 797                 __get_user(event->sigev_notify_thread_id,
 798                         &u_event->sigev_notify_thread_id))
 799                 ? -EFAULT : 0;
 800 }
 801
 802 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 803                        unsigned long bitmap_size)
 804 {
 805         int i, j;
 806         unsigned long m;
 807         compat_ulong_t um;
 808         unsigned long nr_compat_longs;
 809
 810         /* align bitmap up to nearest compat_long_t boundary */
 811         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 812
 813         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 814                 return -EFAULT;
 815
 816         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 817
 818         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 819                 m = 0;
 820
 821                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 822                         /*
 823                          * We dont want to read past the end of the userspace
 824                          * bitmap. We must however ensure the end of the
 825                          * kernel bitmap is zeroed.
 826                          */
 827                         if (nr_compat_longs-- > 0) {
 828                                 if (__get_user(um, umask))
 829                                         return -EFAULT;
 830                         } else {
 831                                 um = 0;
 832                         }
 833
 834                         umask++;
 835                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 836                 }
 837                 *mask++ = m;
 838         }
 839
 840         return 0;
 841 }
 842
 843 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 844                        unsigned long bitmap_size)
 845 {
 846         int i, j;
 847         unsigned long m;
 848         compat_ulong_t um;
 849         unsigned long nr_compat_longs;
 850
 851         /* align bitmap up to nearest compat_long_t boundary */
 852         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 853
 854         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 855                 return -EFAULT;
 856
 857         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 858
 859         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 860                 m = *mask++;
 861
 862                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 863                         um = m;
 864
 865                         /*
 866                          * We dont want to write past the end of the userspace
 867                          * bitmap.
 868                          */
 869                         if (nr_compat_longs-- > 0) {
 870                                 if (__put_user(um, umask))
 871                                         return -EFAULT;
 872                         }
 873
 874                         umask++;
 875                         m >>= 4*sizeof(um);
 876                         m >>= 4*sizeof(um);
 877                 }
 878         }
 879
 880         return 0;
 881 }
 882
 883 void
 884 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 885 {
 886         switch (_NSIG_WORDS) {
 887         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 888         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 889         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 890         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 891         }
 892 }
 893 EXPORT_SYMBOL_GPL(sigset_from_compat);
 894
 895 asmlinkage long
 896 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 897                 struct compat_siginfo __user *uinfo,
 898                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 899 {
 900         compat_sigset_t s32;
 901         sigset_t s;
 902         struct timespec t;
 903         siginfo_t info;
 904         long ret;
 905
 906         if (sigsetsize != sizeof(sigset_t))
 907                 return -EINVAL;
 908
 909         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 910                 return -EFAULT;
 911         sigset_from_compat(&s, &s32);
 912
 913         if (uts) {
 914                 if (get_compat_timespec(&t, uts))
 915                         return -EFAULT;
 916         }
 917
 918         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 919
 920         if (ret > 0 && uinfo) {
 921                 if (copy_siginfo_to_user32(uinfo, &info))
 922                         ret = -EFAULT;
 923         }
 924
 925         return ret;
 926
 927 }
 928
 929 asmlinkage long
 930 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 931                              struct compat_siginfo __user *uinfo)
 932 {
 933         siginfo_t info;
 934
 935         if (copy_siginfo_from_user32(&info, uinfo))
 936                 return -EFAULT;
 937         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 938 }
 939
 940 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 941
 942 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 943
 944 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 945 {
 946         compat_time_t i;
 947         struct timeval tv;
 948
 949         do_gettimeofday(&tv);
 950         i = tv.tv_sec;
 951
 952         if (tloc) {
 953                 if (put_user(i,tloc))
 954                         return -EFAULT;
 955         }
 956         force_successful_syscall_return();
 957         return i;
 958 }
 959
 960 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 961 {
 962         struct timespec tv;
 963         int err;
 964
 965         if (get_user(tv.tv_sec, tptr))
 966                 return -EFAULT;
 967
 968         tv.tv_nsec = 0;
 969
 970         err = security_settime(&tv, NULL);
 971         if (err)
 972                 return err;
 973
 974         do_settimeofday(&tv);
 975         return 0;
 976 }
 977
 978 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 979
 980 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 981 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 982 {
 983         sigset_t newset;
 984         compat_sigset_t newset32;
 985
 986         /* XXX: Don't preclude handling different sized sigset_t's.  */
 987         if (sigsetsize != sizeof(sigset_t))
 988                 return -EINVAL;
 989
 990         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 991                 return -EFAULT;
 992         sigset_from_compat(&newset, &newset32);
 993         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 994
 995         current->saved_sigmask = current->blocked;
 996         set_current_blocked(&newset);
 997
 998         current->state = TASK_INTERRUPTIBLE;
 999         schedule();
1000         set_restore_sigmask();
1001         return -ERESTARTNOHAND;
1002 }
1003 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1004
1005 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1006 {
1007         struct timex txc;
1008         int err, ret;
1009
1010         err = compat_get_timex(&txc, utp);
1011         if (err)
1012                 return err;
1013
1014         ret = do_adjtimex(&txc);
1015
1016         err = compat_put_timex(utp, &txc);
1017         if (err)
1018                 return err;
1019
1020         return ret;
1021 }
1022
1023 #ifdef CONFIG_NUMA
1024 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1025                 compat_uptr_t __user *pages32,
1026                 const int __user *nodes,
1027                 int __user *status,
1028                 int flags)
1029 {
1030         const void __user * __user *pages;
1031         int i;
1032
1033         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034         for (i = 0; i < nr_pages; i++) {
1035                 compat_uptr_t p;
1036
1037                 if (get_user(p, pages32 + i) ||
1038                         put_user(compat_ptr(p), pages + i))
1039                         return -EFAULT;
1040         }
1041         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042 }
1043
1044 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045                         compat_ulong_t maxnode,
1046                         const compat_ulong_t __user *old_nodes,
1047                         const compat_ulong_t __user *new_nodes)
1048 {
1049         unsigned long __user *old = NULL;
1050         unsigned long __user *new = NULL;
1051         nodemask_t tmp_mask;
1052         unsigned long nr_bits;
1053         unsigned long size;
1054
1055         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057         if (old_nodes) {
1058                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059                         return -EFAULT;
1060                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061                 if (new_nodes)
1062                         new = old + size / sizeof(unsigned long);
1063                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064                         return -EFAULT;
1065         }
1066         if (new_nodes) {
1067                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068                         return -EFAULT;
1069                 if (new == NULL)
1070                         new = compat_alloc_user_space(size);
1071                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072                         return -EFAULT;
1073         }
1074         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075 }
1076 #endif
1077
1078 struct compat_sysinfo {
1079         s32 uptime;
1080         u32 loads[3];
1081         u32 totalram;
1082         u32 freeram;
1083         u32 sharedram;
1084         u32 bufferram;
1085         u32 totalswap;
1086         u32 freeswap;
1087         u16 procs;
1088         u16 pad;
1089         u32 totalhigh;
1090         u32 freehigh;
1091         u32 mem_unit;
1092         char _f[20-2*sizeof(u32)-sizeof(int)];
1093 };
1094
1095 asmlinkage long
1096 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097 {
1098         struct sysinfo s;
1099
1100         do_sysinfo(&s);
1101
1102         /* Check to see if any memory value is too large for 32-bit and scale
1103          *  down if needed
1104          */
1105         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106                 int bitcount = 0;
1107
1108                 while (s.mem_unit < PAGE_SIZE) {
1109                         s.mem_unit <<= 1;
1110                         bitcount++;
1111                 }
1112
1113                 s.totalram >>= bitcount;
1114                 s.freeram >>= bitcount;
1115                 s.sharedram >>= bitcount;
1116                 s.bufferram >>= bitcount;
1117                 s.totalswap >>= bitcount;
1118                 s.freeswap >>= bitcount;
1119                 s.totalhigh >>= bitcount;
1120                 s.freehigh >>= bitcount;
1121         }
1122
1123         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124             __put_user (s.uptime, &info->uptime) ||
1125             __put_user (s.loads[0], &info->loads[0]) ||
1126             __put_user (s.loads[1], &info->loads[1]) ||
1127             __put_user (s.loads[2], &info->loads[2]) ||
1128             __put_user (s.totalram, &info->totalram) ||
1129             __put_user (s.freeram, &info->freeram) ||
1130             __put_user (s.sharedram, &info->sharedram) ||
1131             __put_user (s.bufferram, &info->bufferram) ||
1132             __put_user (s.totalswap, &info->totalswap) ||
1133             __put_user (s.freeswap, &info->freeswap) ||
1134             __put_user (s.procs, &info->procs) ||
1135             __put_user (s.totalhigh, &info->totalhigh) ||
1136             __put_user (s.freehigh, &info->freehigh) ||
1137             __put_user (s.mem_unit, &info->mem_unit))
1138                 return -EFAULT;
1139
1140         return 0;
1141 }
1142
1143 /*
1144  * Allocate user-space memory for the duration of a single system call,
1145  * in order to marshall parameters inside a compat thunk.
1146  */
1147 void __user *compat_alloc_user_space(unsigned long len)
1148 {
1149         void __user *ptr;
1150
1151         /* If len would occupy more than half of the entire compat space... */
1152         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1153                 return NULL;
1154
1155         ptr = arch_compat_alloc_user_space(len);
1156
1157         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1158                 return NULL;
1159
1160         return ptr;
1161 }
1162 EXPORT_SYMBOL_GPL(compat_alloc_user_space);