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
  25 #include <asm/uaccess.h>
  26
  27 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
  28 {
  29         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
  30                         __get_user(ts->tv_sec, &cts->tv_sec) ||
  31                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  32 }
  33
  34 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
  35 {
  36         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
  37                         __put_user(ts->tv_sec, &cts->tv_sec) ||
  38                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
  39 }
  40
  41 static long compat_nanosleep_restart(struct restart_block *restart)
  42 {
  43         unsigned long expire = restart->arg0, now = jiffies;
  44         struct compat_timespec __user *rmtp;
  45
  46         /* Did it expire while we handled signals? */
  47         if (!time_after(expire, now))
  48                 return 0;
  49
  50         expire = schedule_timeout_interruptible(expire - now);
  51         if (expire == 0)
  52                 return 0;
  53
  54         rmtp = (struct compat_timespec __user *)restart->arg1;
  55         if (rmtp) {
  56                 struct compat_timespec ct;
  57                 struct timespec t;
  58
  59                 jiffies_to_timespec(expire, &t);
  60                 ct.tv_sec = t.tv_sec;
  61                 ct.tv_nsec = t.tv_nsec;
  62                 if (copy_to_user(rmtp, &ct, sizeof(ct)))
  63                         return -EFAULT;
  64         }
  65         /* The 'restart' block is already filled in */
  66         return -ERESTART_RESTARTBLOCK;
  67 }
  68
  69 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
  70                 struct compat_timespec __user *rmtp)
  71 {
  72         struct timespec t;
  73         struct restart_block *restart;
  74         unsigned long expire;
  75
  76         if (get_compat_timespec(&t, rqtp))
  77                 return -EFAULT;
  78
  79         if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
  80                 return -EINVAL;
  81
  82         expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
  83         expire = schedule_timeout_interruptible(expire);
  84         if (expire == 0)
  85                 return 0;
  86
  87         if (rmtp) {
  88                 jiffies_to_timespec(expire, &t);
  89                 if (put_compat_timespec(&t, rmtp))
  90                         return -EFAULT;
  91         }
  92         restart = &current_thread_info()->restart_block;
  93         restart->fn = compat_nanosleep_restart;
  94         restart->arg0 = jiffies + expire;
  95         restart->arg1 = (unsigned long) rmtp;
  96         return -ERESTART_RESTARTBLOCK;
  97 }
  98
  99 static inline long get_compat_itimerval(struct itimerval *o,
 100                 struct compat_itimerval __user *i)
 101 {
 102         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 103                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 104                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 105                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 106                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 107 }
 108
 109 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 110                 struct itimerval *i)
 111 {
 112         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 113                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 114                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 115                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 116                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 117 }
 118
 119 asmlinkage long compat_sys_getitimer(int which,
 120                 struct compat_itimerval __user *it)
 121 {
 122         struct itimerval kit;
 123         int error;
 124
 125         error = do_getitimer(which, &kit);
 126         if (!error && put_compat_itimerval(it, &kit))
 127                 error = -EFAULT;
 128         return error;
 129 }
 130
 131 asmlinkage long compat_sys_setitimer(int which,
 132                 struct compat_itimerval __user *in,
 133                 struct compat_itimerval __user *out)
 134 {
 135         struct itimerval kin, kout;
 136         int error;
 137
 138         if (in) {
 139                 if (get_compat_itimerval(&kin, in))
 140                         return -EFAULT;
 141         } else
 142                 memset(&kin, 0, sizeof(kin));
 143
 144         error = do_setitimer(which, &kin, out ? &kout : NULL);
 145         if (error || !out)
 146                 return error;
 147         if (put_compat_itimerval(out, &kout))
 148                 return -EFAULT;
 149         return 0;
 150 }
 151
 152 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 153 {
 154         /*
 155          *      In the SMP world we might just be unlucky and have one of
 156          *      the times increment as we use it. Since the value is an
 157          *      atomically safe type this is just fine. Conceptually its
 158          *      as if the syscall took an instant longer to occur.
 159          */
 160         if (tbuf) {
 161                 struct compat_tms tmp;
 162                 struct task_struct *tsk = current;
 163                 struct task_struct *t;
 164                 cputime_t utime, stime, cutime, cstime;
 165
 166                 read_lock(&tasklist_lock);
 167                 utime = tsk->signal->utime;
 168                 stime = tsk->signal->stime;
 169                 t = tsk;
 170                 do {
 171                         utime = cputime_add(utime, t->utime);
 172                         stime = cputime_add(stime, t->stime);
 173                         t = next_thread(t);
 174                 } while (t != tsk);
 175
 176                 /*
 177                  * While we have tasklist_lock read-locked, no dying thread
 178                  * can be updating current->signal->[us]time.  Instead,
 179                  * we got their counts included in the live thread loop.
 180                  * However, another thread can come in right now and
 181                  * do a wait call that updates current->signal->c[us]time.
 182                  * To make sure we always see that pair updated atomically,
 183                  * we take the siglock around fetching them.
 184                  */
 185                 spin_lock_irq(&tsk->sighand->siglock);
 186                 cutime = tsk->signal->cutime;
 187                 cstime = tsk->signal->cstime;
 188                 spin_unlock_irq(&tsk->sighand->siglock);
 189                 read_unlock(&tasklist_lock);
 190
 191                 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
 192                 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
 193                 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
 194                 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
 195                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 196                         return -EFAULT;
 197         }
 198         return compat_jiffies_to_clock_t(jiffies);
 199 }
 200
 201 /*
 202  * Assumption: old_sigset_t and compat_old_sigset_t are both
 203  * types that can be passed to put_user()/get_user().
 204  */
 205
 206 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 207 {
 208         old_sigset_t s;
 209         long ret;
 210         mm_segment_t old_fs = get_fs();
 211
 212         set_fs(KERNEL_DS);
 213         ret = sys_sigpending((old_sigset_t __user *) &s);
 214         set_fs(old_fs);
 215         if (ret == 0)
 216                 ret = put_user(s, set);
 217         return ret;
 218 }
 219
 220 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 221                 compat_old_sigset_t __user *oset)
 222 {
 223         old_sigset_t s;
 224         long ret;
 225         mm_segment_t old_fs;
 226
 227         if (set && get_user(s, set))
 228                 return -EFAULT;
 229         old_fs = get_fs();
 230         set_fs(KERNEL_DS);
 231         ret = sys_sigprocmask(how,
 232                               set ? (old_sigset_t __user *) &s : NULL,
 233                               oset ? (old_sigset_t __user *) &s : NULL);
 234         set_fs(old_fs);
 235         if (ret == 0)
 236                 if (oset)
 237                         ret = put_user(s, oset);
 238         return ret;
 239 }
 240
 241 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 242                 struct compat_rlimit __user *rlim)
 243 {
 244         struct rlimit r;
 245         int ret;
 246         mm_segment_t old_fs = get_fs ();
 247
 248         if (resource >= RLIM_NLIMITS)
 249                 return -EINVAL;
 250
 251         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 252             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 253             __get_user(r.rlim_max, &rlim->rlim_max))
 254                 return -EFAULT;
 255
 256         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 257                 r.rlim_cur = RLIM_INFINITY;
 258         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 259                 r.rlim_max = RLIM_INFINITY;
 260         set_fs(KERNEL_DS);
 261         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
 262         set_fs(old_fs);
 263         return ret;
 264 }
 265
 266 #ifdef COMPAT_RLIM_OLD_INFINITY
 267
 268 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 269                 struct compat_rlimit __user *rlim)
 270 {
 271         struct rlimit r;
 272         int ret;
 273         mm_segment_t old_fs = get_fs();
 274
 275         set_fs(KERNEL_DS);
 276         ret = sys_old_getrlimit(resource, &r);
 277         set_fs(old_fs);
 278
 279         if (!ret) {
 280                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 281                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 282                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 283                         r.rlim_max = COMPAT_RLIM_INFINITY;
 284
 285                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 286                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 287                     __put_user(r.rlim_max, &rlim->rlim_max))
 288                         return -EFAULT;
 289         }
 290         return ret;
 291 }
 292
 293 #endif
 294
 295 asmlinkage long compat_sys_getrlimit (unsigned int resource,
 296                 struct compat_rlimit __user *rlim)
 297 {
 298         struct rlimit r;
 299         int ret;
 300         mm_segment_t old_fs = get_fs();
 301
 302         set_fs(KERNEL_DS);
 303         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
 304         set_fs(old_fs);
 305         if (!ret) {
 306                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 307                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 308                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 309                         r.rlim_max = COMPAT_RLIM_INFINITY;
 310
 311                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 312                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 313                     __put_user(r.rlim_max, &rlim->rlim_max))
 314                         return -EFAULT;
 315         }
 316         return ret;
 317 }
 318
 319 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 320 {
 321         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 322             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 323             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 324             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 325             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 326             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 327             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 328             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 329             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 330             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 331             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 332             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 333             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 334             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 335             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 336             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 337             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 338             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 339             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 340                 return -EFAULT;
 341         return 0;
 342 }
 343
 344 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 345 {
 346         struct rusage r;
 347         int ret;
 348         mm_segment_t old_fs = get_fs();
 349
 350         set_fs(KERNEL_DS);
 351         ret = sys_getrusage(who, (struct rusage __user *) &r);
 352         set_fs(old_fs);
 353
 354         if (ret)
 355                 return ret;
 356
 357         if (put_compat_rusage(&r, ru))
 358                 return -EFAULT;
 359
 360         return 0;
 361 }
 362
 363 asmlinkage long
 364 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 365         struct compat_rusage __user *ru)
 366 {
 367         if (!ru) {
 368                 return sys_wait4(pid, stat_addr, options, NULL);
 369         } else {
 370                 struct rusage r;
 371                 int ret;
 372                 unsigned int status;
 373                 mm_segment_t old_fs = get_fs();
 374
 375                 set_fs (KERNEL_DS);
 376                 ret = sys_wait4(pid,
 377                                 (stat_addr ?
 378                                  (unsigned int __user *) &status : NULL),
 379                                 options, (struct rusage __user *) &r);
 380                 set_fs (old_fs);
 381
 382                 if (ret > 0) {
 383                         if (put_compat_rusage(&r, ru))
 384                                 return -EFAULT;
 385                         if (stat_addr && put_user(status, stat_addr))
 386                                 return -EFAULT;
 387                 }
 388                 return ret;
 389         }
 390 }
 391
 392 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 393                 struct compat_siginfo __user *uinfo, int options,
 394                 struct compat_rusage __user *uru)
 395 {
 396         siginfo_t info;
 397         struct rusage ru;
 398         long ret;
 399         mm_segment_t old_fs = get_fs();
 400
 401         memset(&info, 0, sizeof(info));
 402
 403         set_fs(KERNEL_DS);
 404         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 405                          uru ? (struct rusage __user *)&ru : NULL);
 406         set_fs(old_fs);
 407
 408         if ((ret < 0) || (info.si_signo == 0))
 409                 return ret;
 410
 411         if (uru) {
 412                 ret = put_compat_rusage(&ru, uru);
 413                 if (ret)
 414                         return ret;
 415         }
 416
 417         BUG_ON(info.si_code & __SI_MASK);
 418         info.si_code |= __SI_CHLD;
 419         return copy_siginfo_to_user32(uinfo, &info);
 420 }
 421
 422 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 423                                     unsigned len, cpumask_t *new_mask)
 424 {
 425         unsigned long *k;
 426
 427         if (len < sizeof(cpumask_t))
 428                 memset(new_mask, 0, sizeof(cpumask_t));
 429         else if (len > sizeof(cpumask_t))
 430                 len = sizeof(cpumask_t);
 431
 432         k = cpus_addr(*new_mask);
 433         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 434 }
 435
 436 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 437                                              unsigned int len,
 438                                              compat_ulong_t __user *user_mask_ptr)
 439 {
 440         cpumask_t new_mask;
 441         int retval;
 442
 443         retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
 444         if (retval)
 445                 return retval;
 446
 447         return sched_setaffinity(pid, new_mask);
 448 }
 449
 450 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 451                                              compat_ulong_t __user *user_mask_ptr)
 452 {
 453         int ret;
 454         cpumask_t mask;
 455         unsigned long *k;
 456         unsigned int min_length = sizeof(cpumask_t);
 457
 458         if (NR_CPUS <= BITS_PER_COMPAT_LONG)
 459                 min_length = sizeof(compat_ulong_t);
 460
 461         if (len < min_length)
 462                 return -EINVAL;
 463
 464         ret = sched_getaffinity(pid, &mask);
 465         if (ret < 0)
 466                 return ret;
 467
 468         k = cpus_addr(mask);
 469         ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
 470         if (ret)
 471                 return ret;
 472
 473         return min_length;
 474 }
 475
 476 static int get_compat_itimerspec(struct itimerspec *dst,
 477                                  struct compat_itimerspec __user *src)
 478 {
 479         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 480             get_compat_timespec(&dst->it_value, &src->it_value))
 481                 return -EFAULT;
 482         return 0;
 483 }
 484
 485 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 486                                  struct itimerspec *src)
 487 {
 488         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 489             put_compat_timespec(&src->it_value, &dst->it_value))
 490                 return -EFAULT;
 491         return 0;
 492 }
 493
 494 long compat_sys_timer_create(clockid_t which_clock,
 495                         struct compat_sigevent __user *timer_event_spec,
 496                         timer_t __user *created_timer_id)
 497 {
 498         struct sigevent __user *event = NULL;
 499
 500         if (timer_event_spec) {
 501                 struct sigevent kevent;
 502
 503                 event = compat_alloc_user_space(sizeof(*event));
 504                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 505                     copy_to_user(event, &kevent, sizeof(*event)))
 506                         return -EFAULT;
 507         }
 508
 509         return sys_timer_create(which_clock, event, created_timer_id);
 510 }
 511
 512 long compat_sys_timer_settime(timer_t timer_id, int flags,
 513                           struct compat_itimerspec __user *new,
 514                           struct compat_itimerspec __user *old)
 515 {
 516         long err;
 517         mm_segment_t oldfs;
 518         struct itimerspec newts, oldts;
 519
 520         if (!new)
 521                 return -EINVAL;
 522         if (get_compat_itimerspec(&newts, new))
 523                 return -EFAULT;
 524         oldfs = get_fs();
 525         set_fs(KERNEL_DS);
 526         err = sys_timer_settime(timer_id, flags,
 527                                 (struct itimerspec __user *) &newts,
 528                                 (struct itimerspec __user *) &oldts);
 529         set_fs(oldfs);
 530         if (!err && old && put_compat_itimerspec(old, &oldts))
 531                 return -EFAULT;
 532         return err;
 533 }
 534
 535 long compat_sys_timer_gettime(timer_t timer_id,
 536                 struct compat_itimerspec __user *setting)
 537 {
 538         long err;
 539         mm_segment_t oldfs;
 540         struct itimerspec ts;
 541
 542         oldfs = get_fs();
 543         set_fs(KERNEL_DS);
 544         err = sys_timer_gettime(timer_id,
 545                                 (struct itimerspec __user *) &ts);
 546         set_fs(oldfs);
 547         if (!err && put_compat_itimerspec(setting, &ts))
 548                 return -EFAULT;
 549         return err;
 550 }
 551
 552 long compat_sys_clock_settime(clockid_t which_clock,
 553                 struct compat_timespec __user *tp)
 554 {
 555         long err;
 556         mm_segment_t oldfs;
 557         struct timespec ts;
 558
 559         if (get_compat_timespec(&ts, tp))
 560                 return -EFAULT;
 561         oldfs = get_fs();
 562         set_fs(KERNEL_DS);
 563         err = sys_clock_settime(which_clock,
 564                                 (struct timespec __user *) &ts);
 565         set_fs(oldfs);
 566         return err;
 567 }
 568
 569 long compat_sys_clock_gettime(clockid_t which_clock,
 570                 struct compat_timespec __user *tp)
 571 {
 572         long err;
 573         mm_segment_t oldfs;
 574         struct timespec ts;
 575
 576         oldfs = get_fs();
 577         set_fs(KERNEL_DS);
 578         err = sys_clock_gettime(which_clock,
 579                                 (struct timespec __user *) &ts);
 580         set_fs(oldfs);
 581         if (!err && put_compat_timespec(&ts, tp))
 582                 return -EFAULT;
 583         return err;
 584 }
 585
 586 long compat_sys_clock_getres(clockid_t which_clock,
 587                 struct compat_timespec __user *tp)
 588 {
 589         long err;
 590         mm_segment_t oldfs;
 591         struct timespec ts;
 592
 593         oldfs = get_fs();
 594         set_fs(KERNEL_DS);
 595         err = sys_clock_getres(which_clock,
 596                                (struct timespec __user *) &ts);
 597         set_fs(oldfs);
 598         if (!err && tp && put_compat_timespec(&ts, tp))
 599                 return -EFAULT;
 600         return err;
 601 }
 602
 603 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 604                             struct compat_timespec __user *rqtp,
 605                             struct compat_timespec __user *rmtp)
 606 {
 607         long err;
 608         mm_segment_t oldfs;
 609         struct timespec in, out;
 610
 611         if (get_compat_timespec(&in, rqtp))
 612                 return -EFAULT;
 613
 614         oldfs = get_fs();
 615         set_fs(KERNEL_DS);
 616         err = sys_clock_nanosleep(which_clock, flags,
 617                                   (struct timespec __user *) &in,
 618                                   (struct timespec __user *) &out);
 619         set_fs(oldfs);
 620         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 621             put_compat_timespec(&out, rmtp))
 622                 return -EFAULT;
 623         return err;
 624 }
 625
 626 /*
 627  * We currently only need the following fields from the sigevent
 628  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 629  * sigev_notify_thread_id).  The others are handled in user mode.
 630  * We also assume that copying sigev_value.sival_int is sufficient
 631  * to keep all the bits of sigev_value.sival_ptr intact.
 632  */
 633 int get_compat_sigevent(struct sigevent *event,
 634                 const struct compat_sigevent __user *u_event)
 635 {
 636         memset(event, 0, sizeof(*event));
 637         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 638                 __get_user(event->sigev_value.sival_int,
 639                         &u_event->sigev_value.sival_int) ||
 640                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 641                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 642                 __get_user(event->sigev_notify_thread_id,
 643                         &u_event->sigev_notify_thread_id))
 644                 ? -EFAULT : 0;
 645 }
 646
 647 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
 648                        unsigned long bitmap_size)
 649 {
 650         int i, j;
 651         unsigned long m;
 652         compat_ulong_t um;
 653         unsigned long nr_compat_longs;
 654
 655         /* align bitmap up to nearest compat_long_t boundary */
 656         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 657
 658         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 659                 return -EFAULT;
 660
 661         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 662
 663         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 664                 m = 0;
 665
 666                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 667                         /*
 668                          * We dont want to read past the end of the userspace
 669                          * bitmap. We must however ensure the end of the
 670                          * kernel bitmap is zeroed.
 671                          */
 672                         if (nr_compat_longs-- > 0) {
 673                                 if (__get_user(um, umask))
 674                                         return -EFAULT;
 675                         } else {
 676                                 um = 0;
 677                         }
 678
 679                         umask++;
 680                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 681                 }
 682                 *mask++ = m;
 683         }
 684
 685         return 0;
 686 }
 687
 688 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 689                        unsigned long bitmap_size)
 690 {
 691         int i, j;
 692         unsigned long m;
 693         compat_ulong_t um;
 694         unsigned long nr_compat_longs;
 695
 696         /* align bitmap up to nearest compat_long_t boundary */
 697         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 698
 699         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 700                 return -EFAULT;
 701
 702         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 703
 704         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 705                 m = *mask++;
 706
 707                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 708                         um = m;
 709
 710                         /*
 711                          * We dont want to write past the end of the userspace
 712                          * bitmap.
 713                          */
 714                         if (nr_compat_longs-- > 0) {
 715                                 if (__put_user(um, umask))
 716                                         return -EFAULT;
 717                         }
 718
 719                         umask++;
 720                         m >>= 4*sizeof(um);
 721                         m >>= 4*sizeof(um);
 722                 }
 723         }
 724
 725         return 0;
 726 }
 727
 728 void
 729 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 730 {
 731         switch (_NSIG_WORDS) {
 732 #if defined (__COMPAT_ENDIAN_SWAP__)
 733         case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
 734         case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
 735         case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
 736         case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
 737 #else
 738         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 739         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 740         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 741         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 742 #endif
 743         }
 744 }
 745
 746 asmlinkage long
 747 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 748                 struct compat_siginfo __user *uinfo,
 749                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 750 {
 751         compat_sigset_t s32;
 752         sigset_t s;
 753         int sig;
 754         struct timespec t;
 755         siginfo_t info;
 756         long ret, timeout = 0;
 757
 758         if (sigsetsize != sizeof(sigset_t))
 759                 return -EINVAL;
 760
 761         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 762                 return -EFAULT;
 763         sigset_from_compat(&s, &s32);
 764         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
 765         signotset(&s);
 766
 767         if (uts) {
 768                 if (get_compat_timespec (&t, uts))
 769                         return -EFAULT;
 770                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
 771                                 || t.tv_sec < 0)
 772                         return -EINVAL;
 773         }
 774
 775         spin_lock_irq(&current->sighand->siglock);
 776         sig = dequeue_signal(current, &s, &info);
 777         if (!sig) {
 778                 timeout = MAX_SCHEDULE_TIMEOUT;
 779                 if (uts)
 780                         timeout = timespec_to_jiffies(&t)
 781                                 +(t.tv_sec || t.tv_nsec);
 782                 if (timeout) {
 783                         current->real_blocked = current->blocked;
 784                         sigandsets(&current->blocked, &current->blocked, &s);
 785
 786                         recalc_sigpending();
 787                         spin_unlock_irq(&current->sighand->siglock);
 788
 789                         timeout = schedule_timeout_interruptible(timeout);
 790
 791                         spin_lock_irq(&current->sighand->siglock);
 792                         sig = dequeue_signal(current, &s, &info);
 793                         current->blocked = current->real_blocked;
 794                         siginitset(&current->real_blocked, 0);
 795                         recalc_sigpending();
 796                 }
 797         }
 798         spin_unlock_irq(&current->sighand->siglock);
 799
 800         if (sig) {
 801                 ret = sig;
 802                 if (uinfo) {
 803                         if (copy_siginfo_to_user32(uinfo, &info))
 804                                 ret = -EFAULT;
 805                 }
 806         }else {
 807                 ret = timeout?-EINTR:-EAGAIN;
 808         }
 809         return ret;
 810
 811 }
 812
 813 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 814
 815 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 816
 817 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 818 {
 819         compat_time_t i;
 820         struct timeval tv;
 821
 822         do_gettimeofday(&tv);
 823         i = tv.tv_sec;
 824
 825         if (tloc) {
 826                 if (put_user(i,tloc))
 827                         i = -EFAULT;
 828         }
 829         return i;
 830 }
 831
 832 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 833 {
 834         struct timespec tv;
 835         int err;
 836
 837         if (get_user(tv.tv_sec, tptr))
 838                 return -EFAULT;
 839
 840         tv.tv_nsec = 0;
 841
 842         err = security_settime(&tv, NULL);
 843         if (err)
 844                 return err;
 845
 846         do_settimeofday(&tv);
 847         return 0;
 848 }
 849
 850 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 851
 852 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 853 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 854 {
 855         sigset_t newset;
 856         compat_sigset_t newset32;
 857
 858         /* XXX: Don't preclude handling different sized sigset_t's.  */
 859         if (sigsetsize != sizeof(sigset_t))
 860                 return -EINVAL;
 861
 862         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 863                 return -EFAULT;
 864         sigset_from_compat(&newset, &newset32);
 865         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 866
 867         spin_lock_irq(&current->sighand->siglock);
 868         current->saved_sigmask = current->blocked;
 869         current->blocked = newset;
 870         recalc_sigpending();
 871         spin_unlock_irq(&current->sighand->siglock);
 872
 873         current->state = TASK_INTERRUPTIBLE;
 874         schedule();
 875         set_thread_flag(TIF_RESTORE_SIGMASK);
 876         return -ERESTARTNOHAND;
 877 }
 878 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
 879
 880 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 881 {
 882         struct timex txc;
 883         int ret;
 884
 885         memset(&txc, 0, sizeof(struct timex));
 886
 887         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 888                         __get_user(txc.modes, &utp->modes) ||
 889                         __get_user(txc.offset, &utp->offset) ||
 890                         __get_user(txc.freq, &utp->freq) ||
 891                         __get_user(txc.maxerror, &utp->maxerror) ||
 892                         __get_user(txc.esterror, &utp->esterror) ||
 893                         __get_user(txc.status, &utp->status) ||
 894                         __get_user(txc.constant, &utp->constant) ||
 895                         __get_user(txc.precision, &utp->precision) ||
 896                         __get_user(txc.tolerance, &utp->tolerance) ||
 897                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 898                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 899                         __get_user(txc.tick, &utp->tick) ||
 900                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
 901                         __get_user(txc.jitter, &utp->jitter) ||
 902                         __get_user(txc.shift, &utp->shift) ||
 903                         __get_user(txc.stabil, &utp->stabil) ||
 904                         __get_user(txc.jitcnt, &utp->jitcnt) ||
 905                         __get_user(txc.calcnt, &utp->calcnt) ||
 906                         __get_user(txc.errcnt, &utp->errcnt) ||
 907                         __get_user(txc.stbcnt, &utp->stbcnt))
 908                 return -EFAULT;
 909
 910         ret = do_adjtimex(&txc);
 911
 912         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 913                         __put_user(txc.modes, &utp->modes) ||
 914                         __put_user(txc.offset, &utp->offset) ||
 915                         __put_user(txc.freq, &utp->freq) ||
 916                         __put_user(txc.maxerror, &utp->maxerror) ||
 917                         __put_user(txc.esterror, &utp->esterror) ||
 918                         __put_user(txc.status, &utp->status) ||
 919                         __put_user(txc.constant, &utp->constant) ||
 920                         __put_user(txc.precision, &utp->precision) ||
 921                         __put_user(txc.tolerance, &utp->tolerance) ||
 922                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
 923                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
 924                         __put_user(txc.tick, &utp->tick) ||
 925                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
 926                         __put_user(txc.jitter, &utp->jitter) ||
 927                         __put_user(txc.shift, &utp->shift) ||
 928                         __put_user(txc.stabil, &utp->stabil) ||
 929                         __put_user(txc.jitcnt, &utp->jitcnt) ||
 930                         __put_user(txc.calcnt, &utp->calcnt) ||
 931                         __put_user(txc.errcnt, &utp->errcnt) ||
 932                         __put_user(txc.stbcnt, &utp->stbcnt))
 933                 ret = -EFAULT;
 934
 935         return ret;
 936 }