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         expire = schedule_timeout_interruptible(expire - now);
  52         if (expire == 0)
  53                 return 0;
  54
  55         rmtp = (struct compat_timespec __user *)restart->arg1;
  56         if (rmtp) {
  57                 struct compat_timespec ct;
  58                 struct timespec t;
  59
  60                 jiffies_to_timespec(expire, &t);
  61                 ct.tv_sec = t.tv_sec;
  62                 ct.tv_nsec = t.tv_nsec;
  63                 if (copy_to_user(rmtp, &ct, sizeof(ct)))
  64                         return -EFAULT;
  65         }
  66         /* The 'restart' block is already filled in */
  67         return -ERESTART_RESTARTBLOCK;
  68 }
  69
  70 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
  71                 struct compat_timespec __user *rmtp)
  72 {
  73         struct timespec t;
  74         struct restart_block *restart;
  75         unsigned long expire;
  76
  77         if (get_compat_timespec(&t, rqtp))
  78                 return -EFAULT;
  79
  80         if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
  81                 return -EINVAL;
  82
  83         expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
  84         expire = schedule_timeout_interruptible(expire);
  85         if (expire == 0)
  86                 return 0;
  87
  88         if (rmtp) {
  89                 jiffies_to_timespec(expire, &t);
  90                 if (put_compat_timespec(&t, rmtp))
  91                         return -EFAULT;
  92         }
  93         restart = &current_thread_info()->restart_block;
  94         restart->fn = compat_nanosleep_restart;
  95         restart->arg0 = jiffies + expire;
  96         restart->arg1 = (unsigned long) rmtp;
  97         return -ERESTART_RESTARTBLOCK;
  98 }
  99
 100 static inline long get_compat_itimerval(struct itimerval *o,
 101                 struct compat_itimerval __user *i)
 102 {
 103         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 104                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 105                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 106                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 107                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 108 }
 109
 110 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 111                 struct itimerval *i)
 112 {
 113         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 114                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 115                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 116                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 117                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 118 }
 119
 120 asmlinkage long compat_sys_getitimer(int which,
 121                 struct compat_itimerval __user *it)
 122 {
 123         struct itimerval kit;
 124         int error;
 125
 126         error = do_getitimer(which, &kit);
 127         if (!error && put_compat_itimerval(it, &kit))
 128                 error = -EFAULT;
 129         return error;
 130 }
 131
 132 asmlinkage long compat_sys_setitimer(int which,
 133                 struct compat_itimerval __user *in,
 134                 struct compat_itimerval __user *out)
 135 {
 136         struct itimerval kin, kout;
 137         int error;
 138
 139         if (in) {
 140                 if (get_compat_itimerval(&kin, in))
 141                         return -EFAULT;
 142         } else
 143                 memset(&kin, 0, sizeof(kin));
 144
 145         error = do_setitimer(which, &kin, out ? &kout : NULL);
 146         if (error || !out)
 147                 return error;
 148         if (put_compat_itimerval(out, &kout))
 149                 return -EFAULT;
 150         return 0;
 151 }
 152
 153 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 154 {
 155         /*
 156          *      In the SMP world we might just be unlucky and have one of
 157          *      the times increment as we use it. Since the value is an
 158          *      atomically safe type this is just fine. Conceptually its
 159          *      as if the syscall took an instant longer to occur.
 160          */
 161         if (tbuf) {
 162                 struct compat_tms tmp;
 163                 struct task_struct *tsk = current;
 164                 struct task_struct *t;
 165                 cputime_t utime, stime, cutime, cstime;
 166
 167                 read_lock(&tasklist_lock);
 168                 utime = tsk->signal->utime;
 169                 stime = tsk->signal->stime;
 170                 t = tsk;
 171                 do {
 172                         utime = cputime_add(utime, t->utime);
 173                         stime = cputime_add(stime, t->stime);
 174                         t = next_thread(t);
 175                 } while (t != tsk);
 176
 177                 /*
 178                  * While we have tasklist_lock read-locked, no dying thread
 179                  * can be updating current->signal->[us]time.  Instead,
 180                  * we got their counts included in the live thread loop.
 181                  * However, another thread can come in right now and
 182                  * do a wait call that updates current->signal->c[us]time.
 183                  * To make sure we always see that pair updated atomically,
 184                  * we take the siglock around fetching them.
 185                  */
 186                 spin_lock_irq(&tsk->sighand->siglock);
 187                 cutime = tsk->signal->cutime;
 188                 cstime = tsk->signal->cstime;
 189                 spin_unlock_irq(&tsk->sighand->siglock);
 190                 read_unlock(&tasklist_lock);
 191
 192                 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
 193                 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
 194                 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
 195                 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
 196                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 197                         return -EFAULT;
 198         }
 199         return compat_jiffies_to_clock_t(jiffies);
 200 }
 201
 202 /*
 203  * Assumption: old_sigset_t and compat_old_sigset_t are both
 204  * types that can be passed to put_user()/get_user().
 205  */
 206
 207 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 208 {
 209         old_sigset_t s;
 210         long ret;
 211         mm_segment_t old_fs = get_fs();
 212
 213         set_fs(KERNEL_DS);
 214         ret = sys_sigpending((old_sigset_t __user *) &s);
 215         set_fs(old_fs);
 216         if (ret == 0)
 217                 ret = put_user(s, set);
 218         return ret;
 219 }
 220
 221 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 222                 compat_old_sigset_t __user *oset)
 223 {
 224         old_sigset_t s;
 225         long ret;
 226         mm_segment_t old_fs;
 227
 228         if (set && get_user(s, set))
 229                 return -EFAULT;
 230         old_fs = get_fs();
 231         set_fs(KERNEL_DS);
 232         ret = sys_sigprocmask(how,
 233                               set ? (old_sigset_t __user *) &s : NULL,
 234                               oset ? (old_sigset_t __user *) &s : NULL);
 235         set_fs(old_fs);
 236         if (ret == 0)
 237                 if (oset)
 238                         ret = put_user(s, oset);
 239         return ret;
 240 }
 241
 242 #ifdef CONFIG_FUTEX
 243 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
 244                 struct compat_timespec __user *utime, u32 __user *uaddr2,
 245                 int val3)
 246 {
 247         struct timespec t;
 248         unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
 249         int val2 = 0;
 250
 251         if ((op == FUTEX_WAIT) && utime) {
 252                 if (get_compat_timespec(&t, utime))
 253                         return -EFAULT;
 254                 timeout = timespec_to_jiffies(&t) + 1;
 255         }
 256         if (op >= FUTEX_REQUEUE)
 257                 val2 = (int) (unsigned long) utime;
 258
 259         return do_futex((unsigned long)uaddr, op, val, timeout,
 260                         (unsigned long)uaddr2, val2, val3);
 261 }
 262 #endif
 263
 264 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 265                 struct compat_rlimit __user *rlim)
 266 {
 267         struct rlimit r;
 268         int ret;
 269         mm_segment_t old_fs = get_fs ();
 270
 271         if (resource >= RLIM_NLIMITS)
 272                 return -EINVAL;
 273
 274         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 275             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 276             __get_user(r.rlim_max, &rlim->rlim_max))
 277                 return -EFAULT;
 278
 279         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 280                 r.rlim_cur = RLIM_INFINITY;
 281         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 282                 r.rlim_max = RLIM_INFINITY;
 283         set_fs(KERNEL_DS);
 284         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 285         set_fs(old_fs);
 286         return ret;
 287 }
 288
 289 #ifdef COMPAT_RLIM_OLD_INFINITY
 290
 291 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 292                 struct compat_rlimit __user *rlim)
 293 {
 294         struct rlimit r;
 295         int ret;
 296         mm_segment_t old_fs = get_fs();
 297
 298         set_fs(KERNEL_DS);
 299         ret = sys_old_getrlimit(resource, &r);
 300         set_fs(old_fs);
 301
 302         if (!ret) {
 303                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 304                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 305                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 306                         r.rlim_max = COMPAT_RLIM_INFINITY;
 307
 308                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 309                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 310                     __put_user(r.rlim_max, &rlim->rlim_max))
 311                         return -EFAULT;
 312         }
 313         return ret;
 314 }
 315
 316 #endif
 317
 318 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 319                 struct compat_rlimit __user *rlim)
 320 {
 321         struct rlimit r;
 322         int ret;
 323         mm_segment_t old_fs = get_fs();
 324
 325         set_fs(KERNEL_DS);
 326         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 327         set_fs(old_fs);
 328         if (!ret) {
 329                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 330                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 331                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 332                         r.rlim_max = COMPAT_RLIM_INFINITY;
 333
 334                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 335                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 336                     __put_user(r.rlim_max, &rlim->rlim_max))
 337                         return -EFAULT;
 338         }
 339         return ret;
 340 }
 341
 342 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 343 {
 344         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 345             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 346             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 347             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 348             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 349             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 350             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 351             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 352             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 353             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 354             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 355             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 356             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 357             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 358             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 359             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 360             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 361             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 362             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 363                 return -EFAULT;
 364         return 0;
 365 }
 366
 367 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 368 {
 369         struct rusage r;
 370         int ret;
 371         mm_segment_t old_fs = get_fs();
 372
 373         set_fs(KERNEL_DS);
 374         ret = sys_getrusage(who, (struct rusage __user *) &r);
 375         set_fs(old_fs);
 376
 377         if (ret)
 378                 return ret;
 379
 380         if (put_compat_rusage(&r, ru))
 381                 return -EFAULT;
 382
 383         return 0;
 384 }
 385
 386 asmlinkage long
 387 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 388         struct compat_rusage __user *ru)
 389 {
 390         if (!ru) {
 391                 return sys_wait4(pid, stat_addr, options, NULL);
 392         } else {
 393                 struct rusage r;
 394                 int ret;
 395                 unsigned int status;
 396                 mm_segment_t old_fs = get_fs();
 397
 398                 set_fs (KERNEL_DS);
 399                 ret = sys_wait4(pid,
 400                                 (stat_addr ?
 401                                  (unsigned int __user *) &status : NULL),
 402                                 options, (struct rusage __user *) &r);
 403                 set_fs (old_fs);
 404
 405                 if (ret > 0) {
 406                         if (put_compat_rusage(&r, ru))
 407                                 return -EFAULT;
 408                         if (stat_addr && put_user(status, stat_addr))
 409                                 return -EFAULT;
 410                 }
 411                 return ret;
 412         }
 413 }
 414
 415 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 416                 struct compat_siginfo __user *uinfo, int options,
 417                 struct compat_rusage __user *uru)
 418 {
 419         siginfo_t info;
 420         struct rusage ru;
 421         long ret;
 422         mm_segment_t old_fs = get_fs();
 423
 424         memset(&info, 0, sizeof(info));
 425
 426         set_fs(KERNEL_DS);
 427         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 428                          uru ? (struct rusage __user *)&ru : NULL);
 429         set_fs(old_fs);
 430
 431         if ((ret < 0) || (info.si_signo == 0))
 432                 return ret;
 433
 434         if (uru) {
 435                 ret = put_compat_rusage(&ru, uru);
 436                 if (ret)
 437                         return ret;
 438         }
 439
 440         BUG_ON(info.si_code & __SI_MASK);
 441         info.si_code |= __SI_CHLD;
 442         return copy_siginfo_to_user32(uinfo, &info);
 443 }
 444
 445 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 446                                     unsigned len, cpumask_t *new_mask)
 447 {
 448         unsigned long *k;
 449
 450         if (len < sizeof(cpumask_t))
 451                 memset(new_mask, 0, sizeof(cpumask_t));
 452         else if (len > sizeof(cpumask_t))
 453                 len = sizeof(cpumask_t);
 454
 455         k = cpus_addr(*new_mask);
 456         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 457 }
 458
 459 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 460                                              unsigned int len,
 461                                              compat_ulong_t __user *user_mask_ptr)
 462 {
 463         cpumask_t new_mask;
 464         int retval;
 465
 466         retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
 467         if (retval)
 468                 return retval;
 469
 470         return sched_setaffinity(pid, new_mask);
 471 }
 472
 473 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 474                                              compat_ulong_t __user *user_mask_ptr)
 475 {
 476         int ret;
 477         cpumask_t mask;
 478         unsigned long *k;
 479         unsigned int min_length = sizeof(cpumask_t);
 480
 481         if (NR_CPUS <= BITS_PER_COMPAT_LONG)
 482                 min_length = sizeof(compat_ulong_t);
 483
 484         if (len < min_length)
 485                 return -EINVAL;
 486
 487         ret = sched_getaffinity(pid, &mask);
 488         if (ret < 0)
 489                 return ret;
 490
 491         k = cpus_addr(mask);
 492         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 493         if (ret)
 494                 return ret;
 495
 496         return min_length;
 497 }
 498
 499 static int get_compat_itimerspec(struct itimerspec *dst,
 500                                  struct compat_itimerspec __user *src)
 501 {
 502         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 503             get_compat_timespec(&dst->it_value, &src->it_value))
 504                 return -EFAULT;
 505         return 0;
 506 }
 507
 508 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 509                                  struct itimerspec *src)
 510 {
 511         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 512             put_compat_timespec(&src->it_value, &dst->it_value))
 513                 return -EFAULT;
 514         return 0;
 515 }
 516
 517 long compat_sys_timer_create(clockid_t which_clock,
 518                         struct compat_sigevent __user *timer_event_spec,
 519                         timer_t __user *created_timer_id)
 520 {
 521         struct sigevent __user *event = NULL;
 522
 523         if (timer_event_spec) {
 524                 struct sigevent kevent;
 525
 526                 event = compat_alloc_user_space(sizeof(*event));
 527                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 528                     copy_to_user(event, &kevent, sizeof(*event)))
 529                         return -EFAULT;
 530         }
 531
 532         return sys_timer_create(which_clock, event, created_timer_id);
 533 }
 534
 535 long compat_sys_timer_settime(timer_t timer_id, int flags,
 536                           struct compat_itimerspec __user *new,
 537                           struct compat_itimerspec __user *old)
 538 {
 539         long err;
 540         mm_segment_t oldfs;
 541         struct itimerspec newts, oldts;
 542
 543         if (!new)
 544                 return -EINVAL;
 545         if (get_compat_itimerspec(&newts, new))
 546                 return -EFAULT;
 547         oldfs = get_fs();
 548         set_fs(KERNEL_DS);
 549         err = sys_timer_settime(timer_id, flags,
 550                                 (struct itimerspec __user *) &newts,
 551                                 (struct itimerspec __user *) &oldts);
 552         set_fs(oldfs);
 553         if (!err && old && put_compat_itimerspec(old, &oldts))
 554                 return -EFAULT;
 555         return err;
 556 }
 557
 558 long compat_sys_timer_gettime(timer_t timer_id,
 559                 struct compat_itimerspec __user *setting)
 560 {
 561         long err;
 562         mm_segment_t oldfs;
 563         struct itimerspec ts;
 564
 565         oldfs = get_fs();
 566         set_fs(KERNEL_DS);
 567         err = sys_timer_gettime(timer_id,
 568                                 (struct itimerspec __user *) &ts);
 569         set_fs(oldfs);
 570         if (!err && put_compat_itimerspec(setting, &ts))
 571                 return -EFAULT;
 572         return err;
 573 }
 574
 575 long compat_sys_clock_settime(clockid_t which_clock,
 576                 struct compat_timespec __user *tp)
 577 {
 578         long err;
 579         mm_segment_t oldfs;
 580         struct timespec ts;
 581
 582         if (get_compat_timespec(&ts, tp))
 583                 return -EFAULT;
 584         oldfs = get_fs();
 585         set_fs(KERNEL_DS);
 586         err = sys_clock_settime(which_clock,
 587                                 (struct timespec __user *) &ts);
 588         set_fs(oldfs);
 589         return err;
 590 }
 591
 592 long compat_sys_clock_gettime(clockid_t which_clock,
 593                 struct compat_timespec __user *tp)
 594 {
 595         long err;
 596         mm_segment_t oldfs;
 597         struct timespec ts;
 598
 599         oldfs = get_fs();
 600         set_fs(KERNEL_DS);
 601         err = sys_clock_gettime(which_clock,
 602                                 (struct timespec __user *) &ts);
 603         set_fs(oldfs);
 604         if (!err && put_compat_timespec(&ts, tp))
 605                 return -EFAULT;
 606         return err;
 607 }
 608
 609 long compat_sys_clock_getres(clockid_t which_clock,
 610                 struct compat_timespec __user *tp)
 611 {
 612         long err;
 613         mm_segment_t oldfs;
 614         struct timespec ts;
 615
 616         oldfs = get_fs();
 617         set_fs(KERNEL_DS);
 618         err = sys_clock_getres(which_clock,
 619                                (struct timespec __user *) &ts);
 620         set_fs(oldfs);
 621         if (!err && tp && put_compat_timespec(&ts, tp))
 622                 return -EFAULT;
 623         return err;
 624 }
 625
 626 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 627                             struct compat_timespec __user *rqtp,
 628                             struct compat_timespec __user *rmtp)
 629 {
 630         long err;
 631         mm_segment_t oldfs;
 632         struct timespec in, out;
 633
 634         if (get_compat_timespec(&in, rqtp))
 635                 return -EFAULT;
 636
 637         oldfs = get_fs();
 638         set_fs(KERNEL_DS);
 639         err = sys_clock_nanosleep(which_clock, flags,
 640                                   (struct timespec __user *) &in,
 641                                   (struct timespec __user *) &out);
 642         set_fs(oldfs);
 643         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 644             put_compat_timespec(&out, rmtp))
 645                 return -EFAULT;
 646         return err;
 647 }
 648
 649 /*
 650  * We currently only need the following fields from the sigevent
 651  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 652  * sigev_notify_thread_id).  The others are handled in user mode.
 653  * We also assume that copying sigev_value.sival_int is sufficient
 654  * to keep all the bits of sigev_value.sival_ptr intact.
 655  */
 656 int get_compat_sigevent(struct sigevent *event,
 657                 const struct compat_sigevent __user *u_event)
 658 {
 659         memset(event, 0, sizeof(*event));
 660         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 661                 __get_user(event->sigev_value.sival_int,
 662                         &u_event->sigev_value.sival_int) ||
 663                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 664                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 665                 __get_user(event->sigev_notify_thread_id,
 666                         &u_event->sigev_notify_thread_id))
 667                 ? -EFAULT : 0;
 668 }
 669
 670 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
 671                        unsigned long bitmap_size)
 672 {
 673         int i, j;
 674         unsigned long m;
 675         compat_ulong_t um;
 676         unsigned long nr_compat_longs;
 677
 678         /* align bitmap up to nearest compat_long_t boundary */
 679         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 680
 681         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 682                 return -EFAULT;
 683
 684         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 685
 686         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 687                 m = 0;
 688
 689                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 690                         /*
 691                          * We dont want to read past the end of the userspace
 692                          * bitmap. We must however ensure the end of the
 693                          * kernel bitmap is zeroed.
 694                          */
 695                         if (nr_compat_longs-- > 0) {
 696                                 if (__get_user(um, umask))
 697                                         return -EFAULT;
 698                         } else {
 699                                 um = 0;
 700                         }
 701
 702                         umask++;
 703                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 704                 }
 705                 *mask++ = m;
 706         }
 707
 708         return 0;
 709 }
 710
 711 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 712                        unsigned long bitmap_size)
 713 {
 714         int i, j;
 715         unsigned long m;
 716         compat_ulong_t um;
 717         unsigned long nr_compat_longs;
 718
 719         /* align bitmap up to nearest compat_long_t boundary */
 720         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 721
 722         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 723                 return -EFAULT;
 724
 725         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 726
 727         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 728                 m = *mask++;
 729
 730                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 731                         um = m;
 732
 733                         /*
 734                          * We dont want to write past the end of the userspace
 735                          * bitmap.
 736                          */
 737                         if (nr_compat_longs-- > 0) {
 738                                 if (__put_user(um, umask))
 739                                         return -EFAULT;
 740                         }
 741
 742                         umask++;
 743                         m >>= 4*sizeof(um);
 744                         m >>= 4*sizeof(um);
 745                 }
 746         }
 747
 748         return 0;
 749 }
 750
 751 void
 752 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 753 {
 754         switch (_NSIG_WORDS) {
 755 #if defined (__COMPAT_ENDIAN_SWAP__)
 756         case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
 757         case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
 758         case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
 759         case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
 760 #else
 761         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 762         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 763         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 764         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 765 #endif
 766         }
 767 }
 768
 769 asmlinkage long
 770 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 771                 struct compat_siginfo __user *uinfo,
 772                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 773 {
 774         compat_sigset_t s32;
 775         sigset_t s;
 776         int sig;
 777         struct timespec t;
 778         siginfo_t info;
 779         long ret, timeout = 0;
 780
 781         if (sigsetsize != sizeof(sigset_t))
 782                 return -EINVAL;
 783
 784         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 785                 return -EFAULT;
 786         sigset_from_compat(&s, &s32);
 787         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 788         signotset(&s);
 789
 790         if (uts) {
 791                 if (get_compat_timespec (&t, uts))
 792                         return -EFAULT;
 793                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 794                                 || t.tv_sec < 0)
 795                         return -EINVAL;
 796         }
 797
 798         spin_lock_irq(&current->sighand->siglock);
 799         sig = dequeue_signal(current, &s, &info);
 800         if (!sig) {
 801                 timeout = MAX_SCHEDULE_TIMEOUT;
 802                 if (uts)
 803                         timeout = timespec_to_jiffies(&t)
 804                                 +(t.tv_sec || t.tv_nsec);
 805                 if (timeout) {
 806                         current->real_blocked = current->blocked;
 807                         sigandsets(&current->blocked, &current->blocked, &s);
 808
 809                         recalc_sigpending();
 810                         spin_unlock_irq(&current->sighand->siglock);
 811
 812                         timeout = schedule_timeout_interruptible(timeout);
 813
 814                         spin_lock_irq(&current->sighand->siglock);
 815                         sig = dequeue_signal(current, &s, &info);
 816                         current->blocked = current->real_blocked;
 817                         siginitset(&current->real_blocked, 0);
 818                         recalc_sigpending();
 819                 }
 820         }
 821         spin_unlock_irq(&current->sighand->siglock);
 822
 823         if (sig) {
 824                 ret = sig;
 825                 if (uinfo) {
 826                         if (copy_siginfo_to_user32(uinfo, &info))
 827                                 ret = -EFAULT;
 828                 }
 829         }else {
 830                 ret = timeout?-EINTR:-EAGAIN;
 831         }
 832         return ret;
 833
 834 }
 835
 836 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 837
 838 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 839
 840 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 841 {
 842         compat_time_t i;
 843         struct timeval tv;
 844
 845         do_gettimeofday(&tv);
 846         i = tv.tv_sec;
 847
 848         if (tloc) {
 849                 if (put_user(i,tloc))
 850                         i = -EFAULT;
 851         }
 852         return i;
 853 }
 854
 855 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 856 {
 857         struct timespec tv;
 858         int err;
 859
 860         if (get_user(tv.tv_sec, tptr))
 861                 return -EFAULT;
 862
 863         tv.tv_nsec = 0;
 864
 865         err = security_settime(&tv, NULL);
 866         if (err)
 867                 return err;
 868
 869         do_settimeofday(&tv);
 870         return 0;
 871 }
 872
 873 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 874
 875 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 876 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 877 {
 878         sigset_t newset;
 879         compat_sigset_t newset32;
 880
 881         /* XXX: Don't preclude handling different sized sigset_t's.  */
 882         if (sigsetsize != sizeof(sigset_t))
 883                 return -EINVAL;
 884
 885         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 886                 return -EFAULT;
 887         sigset_from_compat(&newset, &newset32);
 888         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 889
 890         spin_lock_irq(&current->sighand->siglock);
 891         current->saved_sigmask = current->blocked;
 892         current->blocked = newset;
 893         recalc_sigpending();
 894         spin_unlock_irq(&current->sighand->siglock);
 895
 896         current->state = TASK_INTERRUPTIBLE;
 897         schedule();
 898         set_thread_flag(TIF_RESTORE_SIGMASK);
 899         return -ERESTARTNOHAND;
 900 }
 901 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */