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/futex.h>        /* for FUTEX_WAIT */
  21 #include <linux/syscalls.h>
  22 #include <linux/unistd.h>
  23 #include <linux/security.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/bug.h>
  27
  28 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  29 {
  30         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  31                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  32                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  33 }
  34
  35 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  36 {
  37         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  38                         __put_user(ts->tv_sec, &cts->tv_sec) ||
  39                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  40 }
  41
  42 static long compat_nanosleep_restart(struct restart_block *restart)
  43 {
  44         unsigned long expire = restart->arg0, now = jiffies;
  45         struct compat_timespec __user *rmtp;
  46
  47         /* Did it expire while we handled signals? */
  48         if (!time_after(expire, now))
  49                 return 0;
  50
  51         current->state = TASK_INTERRUPTIBLE;
  52         expire = schedule_timeout(expire - now);
  53         if (expire == 0)
  54                 return 0;
  55
  56         rmtp = (struct compat_timespec __user *)restart->arg1;
  57         if (rmtp) {
  58                 struct compat_timespec ct;
  59                 struct timespec t;
  60
  61                 jiffies_to_timespec(expire, &t);
  62                 ct.tv_sec = t.tv_sec;
  63                 ct.tv_nsec = t.tv_nsec;
  64                 if (copy_to_user(rmtp, &ct, sizeof(ct)))
  65                         return -EFAULT;
  66         }
  67         /* The 'restart' block is already filled in */
  68         return -ERESTART_RESTARTBLOCK;
  69 }
  70
  71 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
  72                 struct compat_timespec __user *rmtp)
  73 {
  74         struct timespec t;
  75         struct restart_block *restart;
  76         unsigned long expire;
  77
  78         if (get_compat_timespec(&t, rqtp))
  79                 return -EFAULT;
  80
  81         if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
  82                 return -EINVAL;
  83
  84         expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
  85         current->state = TASK_INTERRUPTIBLE;
  86         expire = schedule_timeout(expire);
  87         if (expire == 0)
  88                 return 0;
  89
  90         if (rmtp) {
  91                 jiffies_to_timespec(expire, &t);
  92                 if (put_compat_timespec(&t, rmtp))
  93                         return -EFAULT;
  94         }
  95         restart = &current_thread_info()->restart_block;
  96         restart->fn = compat_nanosleep_restart;
  97         restart->arg0 = jiffies + expire;
  98         restart->arg1 = (unsigned long) rmtp;
  99         return -ERESTART_RESTARTBLOCK;
 100 }
 101
 102 static inline long get_compat_itimerval(struct itimerval *o,
 103                 struct compat_itimerval __user *i)
 104 {
 105         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 106                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 107                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 108                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 109                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 110 }
 111
 112 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 113                 struct itimerval *i)
 114 {
 115         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 116                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 117                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 118                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 119                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 120 }
 121
 122 asmlinkage long compat_sys_getitimer(int which,
 123                 struct compat_itimerval __user *it)
 124 {
 125         struct itimerval kit;
 126         int error;
 127
 128         error = do_getitimer(which, &kit);
 129         if (!error && put_compat_itimerval(it, &kit))
 130                 error = -EFAULT;
 131         return error;
 132 }
 133
 134 asmlinkage long compat_sys_setitimer(int which,
 135                 struct compat_itimerval __user *in,
 136                 struct compat_itimerval __user *out)
 137 {
 138         struct itimerval kin, kout;
 139         int error;
 140
 141         if (in) {
 142                 if (get_compat_itimerval(&kin, in))
 143                         return -EFAULT;
 144         } else
 145                 memset(&kin, 0, sizeof(kin));
 146
 147         error = do_setitimer(which, &kin, out ? &kout : NULL);
 148         if (error || !out)
 149                 return error;
 150         if (put_compat_itimerval(out, &kout))
 151                 return -EFAULT;
 152         return 0;
 153 }
 154
 155 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 156 {
 157         /*
 158          *      In the SMP world we might just be unlucky and have one of
 159          *      the times increment as we use it. Since the value is an
 160          *      atomically safe type this is just fine. Conceptually its
 161          *      as if the syscall took an instant longer to occur.
 162          */
 163         if (tbuf) {
 164                 struct compat_tms tmp;
 165                 struct task_struct *tsk = current;
 166                 struct task_struct *t;
 167                 cputime_t utime, stime, cutime, cstime;
 168
 169                 read_lock(&tasklist_lock);
 170                 utime = tsk->signal->utime;
 171                 stime = tsk->signal->stime;
 172                 t = tsk;
 173                 do {
 174                         utime = cputime_add(utime, t->utime);
 175                         stime = cputime_add(stime, t->stime);
 176                         t = next_thread(t);
 177                 } while (t != tsk);
 178
 179                 /*
 180                  * While we have tasklist_lock read-locked, no dying thread
 181                  * can be updating current->signal->[us]time.  Instead,
 182                  * we got their counts included in the live thread loop.
 183                  * However, another thread can come in right now and
 184                  * do a wait call that updates current->signal->c[us]time.
 185                  * To make sure we always see that pair updated atomically,
 186                  * we take the siglock around fetching them.
 187                  */
 188                 spin_lock_irq(&tsk->sighand->siglock);
 189                 cutime = tsk->signal->cutime;
 190                 cstime = tsk->signal->cstime;
 191                 spin_unlock_irq(&tsk->sighand->siglock);
 192                 read_unlock(&tasklist_lock);
 193
 194                 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
 195                 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
 196                 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
 197                 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
 198                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 199                         return -EFAULT;
 200         }
 201         return compat_jiffies_to_clock_t(jiffies);
 202 }
 203
 204 /*
 205  * Assumption: old_sigset_t and compat_old_sigset_t are both
 206  * types that can be passed to put_user()/get_user().
 207  */
 208
 209 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 210 {
 211         old_sigset_t s;
 212         long ret;
 213         mm_segment_t old_fs = get_fs();
 214
 215         set_fs(KERNEL_DS);
 216         ret = sys_sigpending((old_sigset_t __user *) &s);
 217         set_fs(old_fs);
 218         if (ret == 0)
 219                 ret = put_user(s, set);
 220         return ret;
 221 }
 222
 223 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 224                 compat_old_sigset_t __user *oset)
 225 {
 226         old_sigset_t s;
 227         long ret;
 228         mm_segment_t old_fs;
 229
 230         if (set && get_user(s, set))
 231                 return -EFAULT;
 232         old_fs = get_fs();
 233         set_fs(KERNEL_DS);
 234         ret = sys_sigprocmask(how,
 235                               set ? (old_sigset_t __user *) &s : NULL,
 236                               oset ? (old_sigset_t __user *) &s : NULL);
 237         set_fs(old_fs);
 238         if (ret == 0)
 239                 if (oset)
 240                         ret = put_user(s, oset);
 241         return ret;
 242 }
 243
 244 #ifdef CONFIG_FUTEX
 245 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
 246                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 247                 int val3)
 248 {
 249         struct timespec t;
 250         unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
 251         int val2 = 0;
 252
 253         if ((op == FUTEX_WAIT) && utime) {
 254                 if (get_compat_timespec(&t, utime))
 255                         return -EFAULT;
 256                 timeout = timespec_to_jiffies(&t) + 1;
 257         }
 258         if (op >= FUTEX_REQUEUE)
 259                 val2 = (int) (unsigned long) utime;
 260
 261         return do_futex((unsigned long)uaddr, op, val, timeout,
 262                         (unsigned long)uaddr2, val2, val3);
 263 }
 264 #endif
 265
 266 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 267                 struct compat_rlimit __user *rlim)
 268 {
 269         struct rlimit r;
 270         int ret;
 271         mm_segment_t old_fs = get_fs ();
 272
 273         if (resource >= RLIM_NLIMITS)
 274                 return -EINVAL;
 275
 276         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 277             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 278             __get_user(r.rlim_max, &rlim->rlim_max))
 279                 return -EFAULT;
 280
 281         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 282                 r.rlim_cur = RLIM_INFINITY;
 283         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 284                 r.rlim_max = RLIM_INFINITY;
 285         set_fs(KERNEL_DS);
 286         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 287         set_fs(old_fs);
 288         return ret;
 289 }
 290
 291 #ifdef COMPAT_RLIM_OLD_INFINITY
 292
 293 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 294                 struct compat_rlimit __user *rlim)
 295 {
 296         struct rlimit r;
 297         int ret;
 298         mm_segment_t old_fs = get_fs();
 299
 300         set_fs(KERNEL_DS);
 301         ret = sys_old_getrlimit(resource, &r);
 302         set_fs(old_fs);
 303
 304         if (!ret) {
 305                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 306                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 307                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 308                         r.rlim_max = COMPAT_RLIM_INFINITY;
 309
 310                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 311                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 312                     __put_user(r.rlim_max, &rlim->rlim_max))
 313                         return -EFAULT;
 314         }
 315         return ret;
 316 }
 317
 318 #endif
 319
 320 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 321                 struct compat_rlimit __user *rlim)
 322 {
 323         struct rlimit r;
 324         int ret;
 325         mm_segment_t old_fs = get_fs();
 326
 327         set_fs(KERNEL_DS);
 328         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 329         set_fs(old_fs);
 330         if (!ret) {
 331                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 332                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 333                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 334                         r.rlim_max = COMPAT_RLIM_INFINITY;
 335
 336                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 337                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 338                     __put_user(r.rlim_max, &rlim->rlim_max))
 339                         return -EFAULT;
 340         }
 341         return ret;
 342 }
 343
 344 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 345 {
 346         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 347             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 348             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 349             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 350             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 351             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 352             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 353             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 354             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 355             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 356             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 357             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 358             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 359             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 360             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 361             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 362             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 363             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 364             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 365                 return -EFAULT;
 366         return 0;
 367 }
 368
 369 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 370 {
 371         struct rusage r;
 372         int ret;
 373         mm_segment_t old_fs = get_fs();
 374
 375         set_fs(KERNEL_DS);
 376         ret = sys_getrusage(who, (struct rusage __user *) &r);
 377         set_fs(old_fs);
 378
 379         if (ret)
 380                 return ret;
 381
 382         if (put_compat_rusage(&r, ru))
 383                 return -EFAULT;
 384
 385         return 0;
 386 }
 387
 388 asmlinkage long
 389 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 390         struct compat_rusage __user *ru)
 391 {
 392         if (!ru) {
 393                 return sys_wait4(pid, stat_addr, options, NULL);
 394         } else {
 395                 struct rusage r;
 396                 int ret;
 397                 unsigned int status;
 398                 mm_segment_t old_fs = get_fs();
 399
 400                 set_fs (KERNEL_DS);
 401                 ret = sys_wait4(pid,
 402                                 (stat_addr ?
 403                                  (unsigned int __user *) &status : NULL),
 404                                 options, (struct rusage __user *) &r);
 405                 set_fs (old_fs);
 406
 407                 if (ret > 0) {
 408                         if (put_compat_rusage(&r, ru))
 409                                 return -EFAULT;
 410                         if (stat_addr && put_user(status, stat_addr))
 411                                 return -EFAULT;
 412                 }
 413                 return ret;
 414         }
 415 }
 416
 417 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 418                 struct compat_siginfo __user *uinfo, int options,
 419                 struct compat_rusage __user *uru)
 420 {
 421         siginfo_t info;
 422         struct rusage ru;
 423         long ret;
 424         mm_segment_t old_fs = get_fs();
 425
 426         memset(&info, 0, sizeof(info));
 427
 428         set_fs(KERNEL_DS);
 429         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 430                          uru ? (struct rusage __user *)&ru : NULL);
 431         set_fs(old_fs);
 432
 433         if ((ret < 0) || (info.si_signo == 0))
 434                 return ret;
 435
 436         if (uru) {
 437                 ret = put_compat_rusage(&ru, uru);
 438                 if (ret)
 439                         return ret;
 440         }
 441
 442         BUG_ON(info.si_code & __SI_MASK);
 443         info.si_code |= __SI_CHLD;
 444         return copy_siginfo_to_user32(uinfo, &info);
 445 }
 446
 447 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 448                                     unsigned len, cpumask_t *new_mask)
 449 {
 450         unsigned long *k;
 451
 452         if (len < sizeof(cpumask_t))
 453                 memset(new_mask, 0, sizeof(cpumask_t));
 454         else if (len > sizeof(cpumask_t))
 455                 len = sizeof(cpumask_t);
 456
 457         k = cpus_addr(*new_mask);
 458         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 459 }
 460
 461 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 462                                              unsigned int len,
 463                                              compat_ulong_t __user *user_mask_ptr)
 464 {
 465         cpumask_t new_mask;
 466         int retval;
 467
 468         retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
 469         if (retval)
 470                 return retval;
 471
 472         return sched_setaffinity(pid, new_mask);
 473 }
 474
 475 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 476                                              compat_ulong_t __user *user_mask_ptr)
 477 {
 478         int ret;
 479         cpumask_t mask;
 480         unsigned long *k;
 481         unsigned int min_length = sizeof(cpumask_t);
 482
 483         if (NR_CPUS <= BITS_PER_COMPAT_LONG)
 484                 min_length = sizeof(compat_ulong_t);
 485
 486         if (len < min_length)
 487                 return -EINVAL;
 488
 489         ret = sched_getaffinity(pid, &mask);
 490         if (ret < 0)
 491                 return ret;
 492
 493         k = cpus_addr(mask);
 494         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 495         if (ret)
 496                 return ret;
 497
 498         return min_length;
 499 }
 500
 501 static int get_compat_itimerspec(struct itimerspec *dst,
 502                                  struct compat_itimerspec __user *src)
 503 {
 504         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 505             get_compat_timespec(&dst->it_value, &src->it_value))
 506                 return -EFAULT;
 507         return 0;
 508 }
 509
 510 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 511                                  struct itimerspec *src)
 512 {
 513         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 514             put_compat_timespec(&src->it_value, &dst->it_value))
 515                 return -EFAULT;
 516         return 0;
 517 }
 518
 519 long compat_sys_timer_settime(timer_t timer_id, int flags,
 520                           struct compat_itimerspec __user *new,
 521                           struct compat_itimerspec __user *old)
 522 {
 523         long err;
 524         mm_segment_t oldfs;
 525         struct itimerspec newts, oldts;
 526
 527         if (!new)
 528                 return -EINVAL;
 529         if (get_compat_itimerspec(&newts, new))
 530                 return -EFAULT;
 531         oldfs = get_fs();
 532         set_fs(KERNEL_DS);
 533         err = sys_timer_settime(timer_id, flags,
 534                                 (struct itimerspec __user *) &newts,
 535                                 (struct itimerspec __user *) &oldts);
 536         set_fs(oldfs);
 537         if (!err && old && put_compat_itimerspec(old, &oldts))
 538                 return -EFAULT;
 539         return err;
 540 }
 541
 542 long compat_sys_timer_gettime(timer_t timer_id,
 543                 struct compat_itimerspec __user *setting)
 544 {
 545         long err;
 546         mm_segment_t oldfs;
 547         struct itimerspec ts;
 548
 549         oldfs = get_fs();
 550         set_fs(KERNEL_DS);
 551         err = sys_timer_gettime(timer_id,
 552                                 (struct itimerspec __user *) &ts);
 553         set_fs(oldfs);
 554         if (!err && put_compat_itimerspec(setting, &ts))
 555                 return -EFAULT;
 556         return err;
 557 }
 558
 559 long compat_sys_clock_settime(clockid_t which_clock,
 560                 struct compat_timespec __user *tp)
 561 {
 562         long err;
 563         mm_segment_t oldfs;
 564         struct timespec ts;
 565
 566         if (get_compat_timespec(&ts, tp))
 567                 return -EFAULT;
 568         oldfs = get_fs();
 569         set_fs(KERNEL_DS);
 570         err = sys_clock_settime(which_clock,
 571                                 (struct timespec __user *) &ts);
 572         set_fs(oldfs);
 573         return err;
 574 }
 575
 576 long compat_sys_clock_gettime(clockid_t which_clock,
 577                 struct compat_timespec __user *tp)
 578 {
 579         long err;
 580         mm_segment_t oldfs;
 581         struct timespec ts;
 582
 583         oldfs = get_fs();
 584         set_fs(KERNEL_DS);
 585         err = sys_clock_gettime(which_clock,
 586                                 (struct timespec __user *) &ts);
 587         set_fs(oldfs);
 588         if (!err && put_compat_timespec(&ts, tp))
 589                 return -EFAULT;
 590         return err;
 591 }
 592
 593 long compat_sys_clock_getres(clockid_t which_clock,
 594                 struct compat_timespec __user *tp)
 595 {
 596         long err;
 597         mm_segment_t oldfs;
 598         struct timespec ts;
 599
 600         oldfs = get_fs();
 601         set_fs(KERNEL_DS);
 602         err = sys_clock_getres(which_clock,
 603                                (struct timespec __user *) &ts);
 604         set_fs(oldfs);
 605         if (!err && tp && put_compat_timespec(&ts, tp))
 606                 return -EFAULT;
 607         return err;
 608 }
 609
 610 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 611                             struct compat_timespec __user *rqtp,
 612                             struct compat_timespec __user *rmtp)
 613 {
 614         long err;
 615         mm_segment_t oldfs;
 616         struct timespec in, out;
 617
 618         if (get_compat_timespec(&in, rqtp))
 619                 return -EFAULT;
 620
 621         oldfs = get_fs();
 622         set_fs(KERNEL_DS);
 623         err = sys_clock_nanosleep(which_clock, flags,
 624                                   (struct timespec __user *) &in,
 625                                   (struct timespec __user *) &out);
 626         set_fs(oldfs);
 627         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 628             put_compat_timespec(&out, rmtp))
 629                 return -EFAULT;
 630         return err;
 631 }
 632
 633 /*
 634  * We currently only need the following fields from the sigevent
 635  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 636  * sigev_notify_thread_id).  The others are handled in user mode.
 637  * We also assume that copying sigev_value.sival_int is sufficient
 638  * to keep all the bits of sigev_value.sival_ptr intact.
 639  */
 640 int get_compat_sigevent(struct sigevent *event,
 641                 const struct compat_sigevent __user *u_event)
 642 {
 643         memset(event, 0, sizeof(*event));
 644         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 645                 __get_user(event->sigev_value.sival_int,
 646                         &u_event->sigev_value.sival_int) ||
 647                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 648                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 649                 __get_user(event->sigev_notify_thread_id,
 650                         &u_event->sigev_notify_thread_id))
 651                 ? -EFAULT : 0;
 652 }
 653
 654 /* timer_create is architecture specific because it needs sigevent conversion */
 655
 656 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
 657                        unsigned long bitmap_size)
 658 {
 659         int i, j;
 660         unsigned long m;
 661         compat_ulong_t um;
 662         unsigned long nr_compat_longs;
 663
 664         /* align bitmap up to nearest compat_long_t boundary */
 665         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 666
 667         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 668                 return -EFAULT;
 669
 670         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 671
 672         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 673                 m = 0;
 674
 675                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 676                         /*
 677                          * We dont want to read past the end of the userspace
 678                          * bitmap. We must however ensure the end of the
 679                          * kernel bitmap is zeroed.
 680                          */
 681                         if (nr_compat_longs-- > 0) {
 682                                 if (__get_user(um, umask))
 683                                         return -EFAULT;
 684                         } else {
 685                                 um = 0;
 686                         }
 687
 688                         umask++;
 689                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 690                 }
 691                 *mask++ = m;
 692         }
 693
 694         return 0;
 695 }
 696
 697 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 698                        unsigned long bitmap_size)
 699 {
 700         int i, j;
 701         unsigned long m;
 702         compat_ulong_t um;
 703         unsigned long nr_compat_longs;
 704
 705         /* align bitmap up to nearest compat_long_t boundary */
 706         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 707
 708         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 709                 return -EFAULT;
 710
 711         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 712
 713         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 714                 m = *mask++;
 715
 716                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 717                         um = m;
 718
 719                         /*
 720                          * We dont want to write past the end of the userspace
 721                          * bitmap.
 722                          */
 723                         if (nr_compat_longs-- > 0) {
 724                                 if (__put_user(um, umask))
 725                                         return -EFAULT;
 726                         }
 727
 728                         umask++;
 729                         m >>= 4*sizeof(um);
 730                         m >>= 4*sizeof(um);
 731                 }
 732         }
 733
 734         return 0;
 735 }
 736
 737 void
 738 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 739 {
 740         switch (_NSIG_WORDS) {
 741 #if defined (__COMPAT_ENDIAN_SWAP__)
 742         case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
 743         case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
 744         case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
 745         case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
 746 #else
 747         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 748         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 749         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 750         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 751 #endif
 752         }
 753 }
 754
 755 asmlinkage long
 756 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 757                 struct compat_siginfo __user *uinfo,
 758                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 759 {
 760         compat_sigset_t s32;
 761         sigset_t s;
 762         int sig;
 763         struct timespec t;
 764         siginfo_t info;
 765         long ret, timeout = 0;
 766
 767         if (sigsetsize != sizeof(sigset_t))
 768                 return -EINVAL;
 769
 770         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 771                 return -EFAULT;
 772         sigset_from_compat(&s, &s32);
 773         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 774         signotset(&s);
 775
 776         if (uts) {
 777                 if (get_compat_timespec (&t, uts))
 778                         return -EFAULT;
 779                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 780                                 || t.tv_sec < 0)
 781                         return -EINVAL;
 782         }
 783
 784         spin_lock_irq(&current->sighand->siglock);
 785         sig = dequeue_signal(current, &s, &info);
 786         if (!sig) {
 787                 timeout = MAX_SCHEDULE_TIMEOUT;
 788                 if (uts)
 789                         timeout = timespec_to_jiffies(&t)
 790                                 +(t.tv_sec || t.tv_nsec);
 791                 if (timeout) {
 792                         current->real_blocked = current->blocked;
 793                         sigandsets(&current->blocked, &current->blocked, &s);
 794
 795                         recalc_sigpending();
 796                         spin_unlock_irq(&current->sighand->siglock);
 797
 798                         current->state = TASK_INTERRUPTIBLE;
 799                         timeout = schedule_timeout(timeout);
 800
 801                         spin_lock_irq(&current->sighand->siglock);
 802                         sig = dequeue_signal(current, &s, &info);
 803                         current->blocked = current->real_blocked;
 804                         siginitset(&current->real_blocked, 0);
 805                         recalc_sigpending();
 806                 }
 807         }
 808         spin_unlock_irq(&current->sighand->siglock);
 809
 810         if (sig) {
 811                 ret = sig;
 812                 if (uinfo) {
 813                         if (copy_siginfo_to_user32(uinfo, &info))
 814                                 ret = -EFAULT;
 815                 }
 816         }else {
 817                 ret = timeout?-EINTR:-EAGAIN;
 818         }
 819         return ret;
 820
 821 }
 822
 823 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 824
 825 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 826
 827 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 828 {
 829         compat_time_t i;
 830         struct timeval tv;
 831
 832         do_gettimeofday(&tv);
 833         i = tv.tv_sec;
 834
 835         if (tloc) {
 836                 if (put_user(i,tloc))
 837                         i = -EFAULT;
 838         }
 839         return i;
 840 }
 841
 842 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 843 {
 844         struct timespec tv;
 845         int err;
 846
 847         if (get_user(tv.tv_sec, tptr))
 848                 return -EFAULT;
 849
 850         tv.tv_nsec = 0;
 851
 852         err = security_settime(&tv, NULL);
 853         if (err)
 854                 return err;
 855
 856         do_settimeofday(&tv);
 857         return 0;
 858 }
 859
 860 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */