kernel/compat.c

   1 /*
   2  *  linux/kernel/compat.c
   3  *
   4  *  Kernel compatibililty routines for e.g. 32 bit syscall support
   5  *  on 64 bit kernels.
   6  *
   7  *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/linkage.h>
  15 #include <linux/compat.h>
  16 #include <linux/errno.h>
  17 #include <linux/time.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>        /* for MAX_SCHEDULE_TIMEOUT */
  20 #include <linux/syscalls.h>
  21 #include <linux/unistd.h>
  22 #include <linux/security.h>
  23 #include <linux/timex.h>
  24 #include <linux/migrate.h>
  25 #include <linux/posix-timers.h>
  26 #include <linux/times.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/gfp.h>
  29
  30 #include <asm/uaccess.h>
  31
  32 /*
  33  * Note that the native side is already converted to a timespec, because
  34  * that's what we want anyway.
  35  */
  36 static int compat_get_timeval(struct timespec *o,
  37                 struct compat_timeval __user *i)
  38 {
  39         long usec;
  40
  41         if (get_user(o->tv_sec, &i->tv_sec) ||
  42             get_user(usec, &i->tv_usec))
  43                 return -EFAULT;
  44         o->tv_nsec = usec * 1000;
  45         return 0;
  46 }
  47
  48 static int compat_put_timeval(struct compat_timeval __user *o,
  49                 struct timeval *i)
  50 {
  51         return (put_user(i->tv_sec, &o->tv_sec) ||
  52                 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  53 }
  54
  55 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  56 {
  57         memset(txc, 0, sizeof(struct timex));
  58
  59         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  60                         __get_user(txc->modes, &utp->modes) ||
  61                         __get_user(txc->offset, &utp->offset) ||
  62                         __get_user(txc->freq, &utp->freq) ||
  63                         __get_user(txc->maxerror, &utp->maxerror) ||
  64                         __get_user(txc->esterror, &utp->esterror) ||
  65                         __get_user(txc->status, &utp->status) ||
  66                         __get_user(txc->constant, &utp->constant) ||
  67                         __get_user(txc->precision, &utp->precision) ||
  68                         __get_user(txc->tolerance, &utp->tolerance) ||
  69                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  70                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  71                         __get_user(txc->tick, &utp->tick) ||
  72                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  73                         __get_user(txc->jitter, &utp->jitter) ||
  74                         __get_user(txc->shift, &utp->shift) ||
  75                         __get_user(txc->stabil, &utp->stabil) ||
  76                         __get_user(txc->jitcnt, &utp->jitcnt) ||
  77                         __get_user(txc->calcnt, &utp->calcnt) ||
  78                         __get_user(txc->errcnt, &utp->errcnt) ||
  79                         __get_user(txc->stbcnt, &utp->stbcnt))
  80                 return -EFAULT;
  81
  82         return 0;
  83 }
  84
  85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  86 {
  87         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  88                         __put_user(txc->modes, &utp->modes) ||
  89                         __put_user(txc->offset, &utp->offset) ||
  90                         __put_user(txc->freq, &utp->freq) ||
  91                         __put_user(txc->maxerror, &utp->maxerror) ||
  92                         __put_user(txc->esterror, &utp->esterror) ||
  93                         __put_user(txc->status, &utp->status) ||
  94                         __put_user(txc->constant, &utp->constant) ||
  95                         __put_user(txc->precision, &utp->precision) ||
  96                         __put_user(txc->tolerance, &utp->tolerance) ||
  97                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  98                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  99                         __put_user(txc->tick, &utp->tick) ||
 100                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 101                         __put_user(txc->jitter, &utp->jitter) ||
 102                         __put_user(txc->shift, &utp->shift) ||
 103                         __put_user(txc->stabil, &utp->stabil) ||
 104                         __put_user(txc->jitcnt, &utp->jitcnt) ||
 105                         __put_user(txc->calcnt, &utp->calcnt) ||
 106                         __put_user(txc->errcnt, &utp->errcnt) ||
 107                         __put_user(txc->stbcnt, &utp->stbcnt) ||
 108                         __put_user(txc->tai, &utp->tai))
 109                 return -EFAULT;
 110         return 0;
 111 }
 112
 113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 114                 struct timezone __user *tz)
 115 {
 116         if (tv) {
 117                 struct timeval ktv;
 118                 do_gettimeofday(&ktv);
 119                 if (compat_put_timeval(tv, &ktv))
 120                         return -EFAULT;
 121         }
 122         if (tz) {
 123                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 124                         return -EFAULT;
 125         }
 126
 127         return 0;
 128 }
 129
 130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 131                 struct timezone __user *tz)
 132 {
 133         struct timespec kts;
 134         struct timezone ktz;
 135
 136         if (tv) {
 137                 if (compat_get_timeval(&kts, tv))
 138                         return -EFAULT;
 139         }
 140         if (tz) {
 141                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 142                         return -EFAULT;
 143         }
 144
 145         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 146 }
 147
 148 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 149 {
 150         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 151                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 152                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 153 }
 154
 155 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 156 {
 157         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 158                         __put_user(ts->tv_sec, &cts->tv_sec) ||
 159                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 160 }
 161 EXPORT_SYMBOL_GPL(put_compat_timespec);
 162
 163 static long compat_nanosleep_restart(struct restart_block *restart)
 164 {
 165         struct compat_timespec __user *rmtp;
 166         struct timespec rmt;
 167         mm_segment_t oldfs;
 168         long ret;
 169
 170         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 171         oldfs = get_fs();
 172         set_fs(KERNEL_DS);
 173         ret = hrtimer_nanosleep_restart(restart);
 174         set_fs(oldfs);
 175
 176         if (ret) {
 177                 rmtp = restart->nanosleep.compat_rmtp;
 178
 179                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 180                         return -EFAULT;
 181         }
 182
 183         return ret;
 184 }
 185
 186 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 187                                      struct compat_timespec __user *rmtp)
 188 {
 189         struct timespec tu, rmt;
 190         mm_segment_t oldfs;
 191         long ret;
 192
 193         if (get_compat_timespec(&tu, rqtp))
 194                 return -EFAULT;
 195
 196         if (!timespec_valid(&tu))
 197                 return -EINVAL;
 198
 199         oldfs = get_fs();
 200         set_fs(KERNEL_DS);
 201         ret = hrtimer_nanosleep(&tu,
 202                                 rmtp ? (struct timespec __user *)&rmt : NULL,
 203                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 204         set_fs(oldfs);
 205
 206         if (ret) {
 207                 struct restart_block *restart
 208                         = &current_thread_info()->restart_block;
 209
 210                 restart->fn = compat_nanosleep_restart;
 211                 restart->nanosleep.compat_rmtp = rmtp;
 212
 213                 if (rmtp && put_compat_timespec(&rmt, rmtp))
 214                         return -EFAULT;
 215         }
 216
 217         return ret;
 218 }
 219
 220 static inline long get_compat_itimerval(struct itimerval *o,
 221                 struct compat_itimerval __user *i)
 222 {
 223         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 224                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 225                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 226                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 227                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 228 }
 229
 230 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 231                 struct itimerval *i)
 232 {
 233         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 234                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 235                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 236                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 237                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 238 }
 239
 240 asmlinkage long compat_sys_getitimer(int which,
 241                 struct compat_itimerval __user *it)
 242 {
 243         struct itimerval kit;
 244         int error;
 245
 246         error = do_getitimer(which, &kit);
 247         if (!error && put_compat_itimerval(it, &kit))
 248                 error = -EFAULT;
 249         return error;
 250 }
 251
 252 asmlinkage long compat_sys_setitimer(int which,
 253                 struct compat_itimerval __user *in,
 254                 struct compat_itimerval __user *out)
 255 {
 256         struct itimerval kin, kout;
 257         int error;
 258
 259         if (in) {
 260                 if (get_compat_itimerval(&kin, in))
 261                         return -EFAULT;
 262         } else
 263                 memset(&kin, 0, sizeof(kin));
 264
 265         error = do_setitimer(which, &kin, out ? &kout : NULL);
 266         if (error || !out)
 267                 return error;
 268         if (put_compat_itimerval(out, &kout))
 269                 return -EFAULT;
 270         return 0;
 271 }
 272
 273 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 274 {
 275         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 276 }
 277
 278 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 279 {
 280         if (tbuf) {
 281                 struct tms tms;
 282                 struct compat_tms tmp;
 283
 284                 do_sys_times(&tms);
 285                 /* Convert our struct tms to the compat version. */
 286                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 287                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 288                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 289                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 290                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 291                         return -EFAULT;
 292         }
 293         force_successful_syscall_return();
 294         return compat_jiffies_to_clock_t(jiffies);
 295 }
 296
 297 #ifdef __ARCH_WANT_SYS_SIGPENDING
 298
 299 /*
 300  * Assumption: old_sigset_t and compat_old_sigset_t are both
 301  * types that can be passed to put_user()/get_user().
 302  */
 303
 304 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 305 {
 306         old_sigset_t s;
 307         long ret;
 308         mm_segment_t old_fs = get_fs();
 309
 310         set_fs(KERNEL_DS);
 311         ret = sys_sigpending((old_sigset_t __user *) &s);
 312         set_fs(old_fs);
 313         if (ret == 0)
 314                 ret = put_user(s, set);
 315         return ret;
 316 }
 317
 318 #endif
 319
 320 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 321
 322 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 323                 compat_old_sigset_t __user *oset)
 324 {
 325         old_sigset_t s;
 326         long ret;
 327         mm_segment_t old_fs;
 328
 329         if (set && get_user(s, set))
 330                 return -EFAULT;
 331         old_fs = get_fs();
 332         set_fs(KERNEL_DS);
 333         ret = sys_sigprocmask(how,
 334                               set ? (old_sigset_t __user *) &s : NULL,
 335                               oset ? (old_sigset_t __user *) &s : NULL);
 336         set_fs(old_fs);
 337         if (ret == 0)
 338                 if (oset)
 339                         ret = put_user(s, oset);
 340         return ret;
 341 }
 342
 343 #endif
 344
 345 asmlinkage long compat_sys_setrlimit(unsigned int resource,
 346                 struct compat_rlimit __user *rlim)
 347 {
 348         struct rlimit r;
 349
 350         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 351             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 352             __get_user(r.rlim_max, &rlim->rlim_max))
 353                 return -EFAULT;
 354
 355         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 356                 r.rlim_cur = RLIM_INFINITY;
 357         if (r.rlim_max == COMPAT_RLIM_INFINITY)
 358                 r.rlim_max = RLIM_INFINITY;
 359         return do_prlimit(current, resource, &r, NULL);
 360 }
 361
 362 #ifdef COMPAT_RLIM_OLD_INFINITY
 363
 364 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 365                 struct compat_rlimit __user *rlim)
 366 {
 367         struct rlimit r;
 368         int ret;
 369         mm_segment_t old_fs = get_fs();
 370
 371         set_fs(KERNEL_DS);
 372         ret = sys_old_getrlimit(resource, &r);
 373         set_fs(old_fs);
 374
 375         if (!ret) {
 376                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 377                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 378                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 379                         r.rlim_max = COMPAT_RLIM_INFINITY;
 380
 381                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 382                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 383                     __put_user(r.rlim_max, &rlim->rlim_max))
 384                         return -EFAULT;
 385         }
 386         return ret;
 387 }
 388
 389 #endif
 390
 391 asmlinkage long compat_sys_getrlimit(unsigned int resource,
 392                 struct compat_rlimit __user *rlim)
 393 {
 394         struct rlimit r;
 395         int ret;
 396
 397         ret = do_prlimit(current, resource, NULL, &r);
 398         if (!ret) {
 399                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 400                         r.rlim_cur = COMPAT_RLIM_INFINITY;
 401                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
 402                         r.rlim_max = COMPAT_RLIM_INFINITY;
 403
 404                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 405                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 406                     __put_user(r.rlim_max, &rlim->rlim_max))
 407                         return -EFAULT;
 408         }
 409         return ret;
 410 }
 411
 412 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 413 {
 414         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 415             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 416             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 417             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 418             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 419             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 420             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 421             __put_user(r->ru_idrss, &ru->ru_idrss) ||
 422             __put_user(r->ru_isrss, &ru->ru_isrss) ||
 423             __put_user(r->ru_minflt, &ru->ru_minflt) ||
 424             __put_user(r->ru_majflt, &ru->ru_majflt) ||
 425             __put_user(r->ru_nswap, &ru->ru_nswap) ||
 426             __put_user(r->ru_inblock, &ru->ru_inblock) ||
 427             __put_user(r->ru_oublock, &ru->ru_oublock) ||
 428             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 429             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 430             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 431             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 432             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 433                 return -EFAULT;
 434         return 0;
 435 }
 436
 437 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 438 {
 439         struct rusage r;
 440         int ret;
 441         mm_segment_t old_fs = get_fs();
 442
 443         set_fs(KERNEL_DS);
 444         ret = sys_getrusage(who, (struct rusage __user *) &r);
 445         set_fs(old_fs);
 446
 447         if (ret)
 448                 return ret;
 449
 450         if (put_compat_rusage(&r, ru))
 451                 return -EFAULT;
 452
 453         return 0;
 454 }
 455
 456 asmlinkage long
 457 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 458         struct compat_rusage __user *ru)
 459 {
 460         if (!ru) {
 461                 return sys_wait4(pid, stat_addr, options, NULL);
 462         } else {
 463                 struct rusage r;
 464                 int ret;
 465                 unsigned int status;
 466                 mm_segment_t old_fs = get_fs();
 467
 468                 set_fs (KERNEL_DS);
 469                 ret = sys_wait4(pid,
 470                                 (stat_addr ?
 471                                  (unsigned int __user *) &status : NULL),
 472                                 options, (struct rusage __user *) &r);
 473                 set_fs (old_fs);
 474
 475                 if (ret > 0) {
 476                         if (put_compat_rusage(&r, ru))
 477                                 return -EFAULT;
 478                         if (stat_addr && put_user(status, stat_addr))
 479                                 return -EFAULT;
 480                 }
 481                 return ret;
 482         }
 483 }
 484
 485 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 486                 struct compat_siginfo __user *uinfo, int options,
 487                 struct compat_rusage __user *uru)
 488 {
 489         siginfo_t info;
 490         struct rusage ru;
 491         long ret;
 492         mm_segment_t old_fs = get_fs();
 493
 494         memset(&info, 0, sizeof(info));
 495
 496         set_fs(KERNEL_DS);
 497         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 498                          uru ? (struct rusage __user *)&ru : NULL);
 499         set_fs(old_fs);
 500
 501         if ((ret < 0) || (info.si_signo == 0))
 502                 return ret;
 503
 504         if (uru) {
 505                 ret = put_compat_rusage(&ru, uru);
 506                 if (ret)
 507                         return ret;
 508         }
 509
 510         BUG_ON(info.si_code & __SI_MASK);
 511         info.si_code |= __SI_CHLD;
 512         return copy_siginfo_to_user32(uinfo, &info);
 513 }
 514
 515 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 516                                     unsigned len, struct cpumask *new_mask)
 517 {
 518         unsigned long *k;
 519
 520         if (len < cpumask_size())
 521                 memset(new_mask, 0, cpumask_size());
 522         else if (len > cpumask_size())
 523                 len = cpumask_size();
 524
 525         k = cpumask_bits(new_mask);
 526         return compat_get_bitmap(k, user_mask_ptr, len * 8);
 527 }
 528
 529 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 530                                              unsigned int len,
 531                                              compat_ulong_t __user *user_mask_ptr)
 532 {
 533         cpumask_var_t new_mask;
 534         int retval;
 535
 536         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 537                 return -ENOMEM;
 538
 539         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 540         if (retval)
 541                 goto out;
 542
 543         retval = sched_setaffinity(pid, new_mask);
 544 out:
 545         free_cpumask_var(new_mask);
 546         return retval;
 547 }
 548
 549 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 550                                              compat_ulong_t __user *user_mask_ptr)
 551 {
 552         int ret;
 553         cpumask_var_t mask;
 554
 555         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 556                 return -EINVAL;
 557         if (len & (sizeof(compat_ulong_t)-1))
 558                 return -EINVAL;
 559
 560         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 561                 return -ENOMEM;
 562
 563         ret = sched_getaffinity(pid, mask);
 564         if (ret == 0) {
 565                 size_t retlen = min_t(size_t, len, cpumask_size());
 566
 567                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 568                         ret = -EFAULT;
 569                 else
 570                         ret = retlen;
 571         }
 572         free_cpumask_var(mask);
 573
 574         return ret;
 575 }
 576
 577 int get_compat_itimerspec(struct itimerspec *dst,
 578                           const struct compat_itimerspec __user *src)
 579 {
 580         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 581             get_compat_timespec(&dst->it_value, &src->it_value))
 582                 return -EFAULT;
 583         return 0;
 584 }
 585
 586 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 587                           const struct itimerspec *src)
 588 {
 589         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 590             put_compat_timespec(&src->it_value, &dst->it_value))
 591                 return -EFAULT;
 592         return 0;
 593 }
 594
 595 long compat_sys_timer_create(clockid_t which_clock,
 596                         struct compat_sigevent __user *timer_event_spec,
 597                         timer_t __user *created_timer_id)
 598 {
 599         struct sigevent __user *event = NULL;
 600
 601         if (timer_event_spec) {
 602                 struct sigevent kevent;
 603
 604                 event = compat_alloc_user_space(sizeof(*event));
 605                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
 606                     copy_to_user(event, &kevent, sizeof(*event)))
 607                         return -EFAULT;
 608         }
 609
 610         return sys_timer_create(which_clock, event, created_timer_id);
 611 }
 612
 613 long compat_sys_timer_settime(timer_t timer_id, int flags,
 614                           struct compat_itimerspec __user *new,
 615                           struct compat_itimerspec __user *old)
 616 {
 617         long err;
 618         mm_segment_t oldfs;
 619         struct itimerspec newts, oldts;
 620
 621         if (!new)
 622                 return -EINVAL;
 623         if (get_compat_itimerspec(&newts, new))
 624                 return -EFAULT;
 625         oldfs = get_fs();
 626         set_fs(KERNEL_DS);
 627         err = sys_timer_settime(timer_id, flags,
 628                                 (struct itimerspec __user *) &newts,
 629                                 (struct itimerspec __user *) &oldts);
 630         set_fs(oldfs);
 631         if (!err && old && put_compat_itimerspec(old, &oldts))
 632                 return -EFAULT;
 633         return err;
 634 }
 635
 636 long compat_sys_timer_gettime(timer_t timer_id,
 637                 struct compat_itimerspec __user *setting)
 638 {
 639         long err;
 640         mm_segment_t oldfs;
 641         struct itimerspec ts;
 642
 643         oldfs = get_fs();
 644         set_fs(KERNEL_DS);
 645         err = sys_timer_gettime(timer_id,
 646                                 (struct itimerspec __user *) &ts);
 647         set_fs(oldfs);
 648         if (!err && put_compat_itimerspec(setting, &ts))
 649                 return -EFAULT;
 650         return err;
 651 }
 652
 653 long compat_sys_clock_settime(clockid_t which_clock,
 654                 struct compat_timespec __user *tp)
 655 {
 656         long err;
 657         mm_segment_t oldfs;
 658         struct timespec ts;
 659
 660         if (get_compat_timespec(&ts, tp))
 661                 return -EFAULT;
 662         oldfs = get_fs();
 663         set_fs(KERNEL_DS);
 664         err = sys_clock_settime(which_clock,
 665                                 (struct timespec __user *) &ts);
 666         set_fs(oldfs);
 667         return err;
 668 }
 669
 670 long compat_sys_clock_gettime(clockid_t which_clock,
 671                 struct compat_timespec __user *tp)
 672 {
 673         long err;
 674         mm_segment_t oldfs;
 675         struct timespec ts;
 676
 677         oldfs = get_fs();
 678         set_fs(KERNEL_DS);
 679         err = sys_clock_gettime(which_clock,
 680                                 (struct timespec __user *) &ts);
 681         set_fs(oldfs);
 682         if (!err && put_compat_timespec(&ts, tp))
 683                 return -EFAULT;
 684         return err;
 685 }
 686
 687 long compat_sys_clock_adjtime(clockid_t which_clock,
 688                 struct compat_timex __user *utp)
 689 {
 690         struct timex txc;
 691         mm_segment_t oldfs;
 692         int err, ret;
 693
 694         err = compat_get_timex(&txc, utp);
 695         if (err)
 696                 return err;
 697
 698         oldfs = get_fs();
 699         set_fs(KERNEL_DS);
 700         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 701         set_fs(oldfs);
 702
 703         err = compat_put_timex(utp, &txc);
 704         if (err)
 705                 return err;
 706
 707         return ret;
 708 }
 709
 710 long compat_sys_clock_getres(clockid_t which_clock,
 711                 struct compat_timespec __user *tp)
 712 {
 713         long err;
 714         mm_segment_t oldfs;
 715         struct timespec ts;
 716
 717         oldfs = get_fs();
 718         set_fs(KERNEL_DS);
 719         err = sys_clock_getres(which_clock,
 720                                (struct timespec __user *) &ts);
 721         set_fs(oldfs);
 722         if (!err && tp && put_compat_timespec(&ts, tp))
 723                 return -EFAULT;
 724         return err;
 725 }
 726
 727 static long compat_clock_nanosleep_restart(struct restart_block *restart)
 728 {
 729         long err;
 730         mm_segment_t oldfs;
 731         struct timespec tu;
 732         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 733
 734         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 735         oldfs = get_fs();
 736         set_fs(KERNEL_DS);
 737         err = clock_nanosleep_restart(restart);
 738         set_fs(oldfs);
 739
 740         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 741             put_compat_timespec(&tu, rmtp))
 742                 return -EFAULT;
 743
 744         if (err == -ERESTART_RESTARTBLOCK) {
 745                 restart->fn = compat_clock_nanosleep_restart;
 746                 restart->nanosleep.compat_rmtp = rmtp;
 747         }
 748         return err;
 749 }
 750
 751 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 752                             struct compat_timespec __user *rqtp,
 753                             struct compat_timespec __user *rmtp)
 754 {
 755         long err;
 756         mm_segment_t oldfs;
 757         struct timespec in, out;
 758         struct restart_block *restart;
 759
 760         if (get_compat_timespec(&in, rqtp))
 761                 return -EFAULT;
 762
 763         oldfs = get_fs();
 764         set_fs(KERNEL_DS);
 765         err = sys_clock_nanosleep(which_clock, flags,
 766                                   (struct timespec __user *) &in,
 767                                   (struct timespec __user *) &out);
 768         set_fs(oldfs);
 769
 770         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 771             put_compat_timespec(&out, rmtp))
 772                 return -EFAULT;
 773
 774         if (err == -ERESTART_RESTARTBLOCK) {
 775                 restart = &current_thread_info()->restart_block;
 776                 restart->fn = compat_clock_nanosleep_restart;
 777                 restart->nanosleep.compat_rmtp = rmtp;
 778         }
 779         return err;
 780 }
 781
 782 /*
 783  * We currently only need the following fields from the sigevent
 784  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 785  * sigev_notify_thread_id).  The others are handled in user mode.
 786  * We also assume that copying sigev_value.sival_int is sufficient
 787  * to keep all the bits of sigev_value.sival_ptr intact.
 788  */
 789 int get_compat_sigevent(struct sigevent *event,
 790                 const struct compat_sigevent __user *u_event)
 791 {
 792         memset(event, 0, sizeof(*event));
 793         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 794                 __get_user(event->sigev_value.sival_int,
 795                         &u_event->sigev_value.sival_int) ||
 796                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 797                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 798                 __get_user(event->sigev_notify_thread_id,
 799                         &u_event->sigev_notify_thread_id))
 800                 ? -EFAULT : 0;
 801 }
 802
 803 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 804                        unsigned long bitmap_size)
 805 {
 806         int i, j;
 807         unsigned long m;
 808         compat_ulong_t um;
 809         unsigned long nr_compat_longs;
 810
 811         /* align bitmap up to nearest compat_long_t boundary */
 812         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 813
 814         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 815                 return -EFAULT;
 816
 817         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 818
 819         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 820                 m = 0;
 821
 822                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 823                         /*
 824                          * We dont want to read past the end of the userspace
 825                          * bitmap. We must however ensure the end of the
 826                          * kernel bitmap is zeroed.
 827                          */
 828                         if (nr_compat_longs-- > 0) {
 829                                 if (__get_user(um, umask))
 830                                         return -EFAULT;
 831                         } else {
 832                                 um = 0;
 833                         }
 834
 835                         umask++;
 836                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 837                 }
 838                 *mask++ = m;
 839         }
 840
 841         return 0;
 842 }
 843
 844 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 845                        unsigned long bitmap_size)
 846 {
 847         int i, j;
 848         unsigned long m;
 849         compat_ulong_t um;
 850         unsigned long nr_compat_longs;
 851
 852         /* align bitmap up to nearest compat_long_t boundary */
 853         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 854
 855         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 856                 return -EFAULT;
 857
 858         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 859
 860         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 861                 m = *mask++;
 862
 863                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 864                         um = m;
 865
 866                         /*
 867                          * We dont want to write past the end of the userspace
 868                          * bitmap.
 869                          */
 870                         if (nr_compat_longs-- > 0) {
 871                                 if (__put_user(um, umask))
 872                                         return -EFAULT;
 873                         }
 874
 875                         umask++;
 876                         m >>= 4*sizeof(um);
 877                         m >>= 4*sizeof(um);
 878                 }
 879         }
 880
 881         return 0;
 882 }
 883
 884 void
 885 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 886 {
 887         switch (_NSIG_WORDS) {
 888         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 889         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 890         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 891         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 892         }
 893 }
 894 EXPORT_SYMBOL_GPL(sigset_from_compat);
 895
 896 asmlinkage long
 897 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 898                 struct compat_siginfo __user *uinfo,
 899                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
 900 {
 901         compat_sigset_t s32;
 902         sigset_t s;
 903         struct timespec t;
 904         siginfo_t info;
 905         long ret;
 906
 907         if (sigsetsize != sizeof(sigset_t))
 908                 return -EINVAL;
 909
 910         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 911                 return -EFAULT;
 912         sigset_from_compat(&s, &s32);
 913
 914         if (uts) {
 915                 if (get_compat_timespec(&t, uts))
 916                         return -EFAULT;
 917         }
 918
 919         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 920
 921         if (ret > 0 && uinfo) {
 922                 if (copy_siginfo_to_user32(uinfo, &info))
 923                         ret = -EFAULT;
 924         }
 925
 926         return ret;
 927
 928 }
 929
 930 asmlinkage long
 931 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 932                              struct compat_siginfo __user *uinfo)
 933 {
 934         siginfo_t info;
 935
 936         if (copy_siginfo_from_user32(&info, uinfo))
 937                 return -EFAULT;
 938         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 939 }
 940
 941 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 942
 943 /* compat_time_t is a 32 bit "long" and needs to get converted. */
 944
 945 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 946 {
 947         compat_time_t i;
 948         struct timeval tv;
 949
 950         do_gettimeofday(&tv);
 951         i = tv.tv_sec;
 952
 953         if (tloc) {
 954                 if (put_user(i,tloc))
 955                         return -EFAULT;
 956         }
 957         force_successful_syscall_return();
 958         return i;
 959 }
 960
 961 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 962 {
 963         struct timespec tv;
 964         int err;
 965
 966         if (get_user(tv.tv_sec, tptr))
 967                 return -EFAULT;
 968
 969         tv.tv_nsec = 0;
 970
 971         err = security_settime(&tv, NULL);
 972         if (err)
 973                 return err;
 974
 975         do_settimeofday(&tv);
 976         return 0;
 977 }
 978
 979 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 980
 981 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 982 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 983 {
 984         sigset_t newset;
 985         compat_sigset_t newset32;
 986
 987         /* XXX: Don't preclude handling different sized sigset_t's.  */
 988         if (sigsetsize != sizeof(sigset_t))
 989                 return -EINVAL;
 990
 991         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 992                 return -EFAULT;
 993         sigset_from_compat(&newset, &newset32);
 994         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 995
 996         current->saved_sigmask = current->blocked;
 997         set_current_blocked(&newset);
 998
 999         current->state = TASK_INTERRUPTIBLE;
1000         schedule();
1001         set_restore_sigmask();
1002         return -ERESTARTNOHAND;
1003 }
1004 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1005
1006 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1007 {
1008         struct timex txc;
1009         int err, ret;
1010
1011         err = compat_get_timex(&txc, utp);
1012         if (err)
1013                 return err;
1014
1015         ret = do_adjtimex(&txc);
1016
1017         err = compat_put_timex(utp, &txc);
1018         if (err)
1019                 return err;
1020
1021         return ret;
1022 }
1023
1024 #ifdef CONFIG_NUMA
1025 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1026                 compat_uptr_t __user *pages32,
1027                 const int __user *nodes,
1028                 int __user *status,
1029                 int flags)
1030 {
1031         const void __user * __user *pages;
1032         int i;
1033
1034         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1035         for (i = 0; i < nr_pages; i++) {
1036                 compat_uptr_t p;
1037
1038                 if (get_user(p, pages32 + i) ||
1039                         put_user(compat_ptr(p), pages + i))
1040                         return -EFAULT;
1041         }
1042         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1043 }
1044
1045 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1046                         compat_ulong_t maxnode,
1047                         const compat_ulong_t __user *old_nodes,
1048                         const compat_ulong_t __user *new_nodes)
1049 {
1050         unsigned long __user *old = NULL;
1051         unsigned long __user *new = NULL;
1052         nodemask_t tmp_mask;
1053         unsigned long nr_bits;
1054         unsigned long size;
1055
1056         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1057         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1058         if (old_nodes) {
1059                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1060                         return -EFAULT;
1061                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1062                 if (new_nodes)
1063                         new = old + size / sizeof(unsigned long);
1064                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1065                         return -EFAULT;
1066         }
1067         if (new_nodes) {
1068                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1069                         return -EFAULT;
1070                 if (new == NULL)
1071                         new = compat_alloc_user_space(size);
1072                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1073                         return -EFAULT;
1074         }
1075         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1076 }
1077 #endif
1078
1079 struct compat_sysinfo {
1080         s32 uptime;
1081         u32 loads[3];
1082         u32 totalram;
1083         u32 freeram;
1084         u32 sharedram;
1085         u32 bufferram;
1086         u32 totalswap;
1087         u32 freeswap;
1088         u16 procs;
1089         u16 pad;
1090         u32 totalhigh;
1091         u32 freehigh;
1092         u32 mem_unit;
1093         char _f[20-2*sizeof(u32)-sizeof(int)];
1094 };
1095
1096 asmlinkage long
1097 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1098 {
1099         struct sysinfo s;
1100
1101         do_sysinfo(&s);
1102
1103         /* Check to see if any memory value is too large for 32-bit and scale
1104          *  down if needed
1105          */
1106         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1107                 int bitcount = 0;
1108
1109                 while (s.mem_unit < PAGE_SIZE) {
1110                         s.mem_unit <<= 1;
1111                         bitcount++;
1112                 }
1113
1114                 s.totalram >>= bitcount;
1115                 s.freeram >>= bitcount;
1116                 s.sharedram >>= bitcount;
1117                 s.bufferram >>= bitcount;
1118                 s.totalswap >>= bitcount;
1119                 s.freeswap >>= bitcount;
1120                 s.totalhigh >>= bitcount;
1121                 s.freehigh >>= bitcount;
1122         }
1123
1124         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1125             __put_user (s.uptime, &info->uptime) ||
1126             __put_user (s.loads[0], &info->loads[0]) ||
1127             __put_user (s.loads[1], &info->loads[1]) ||
1128             __put_user (s.loads[2], &info->loads[2]) ||
1129             __put_user (s.totalram, &info->totalram) ||
1130             __put_user (s.freeram, &info->freeram) ||
1131             __put_user (s.sharedram, &info->sharedram) ||
1132             __put_user (s.bufferram, &info->bufferram) ||
1133             __put_user (s.totalswap, &info->totalswap) ||
1134             __put_user (s.freeswap, &info->freeswap) ||
1135             __put_user (s.procs, &info->procs) ||
1136             __put_user (s.totalhigh, &info->totalhigh) ||
1137             __put_user (s.freehigh, &info->freehigh) ||
1138             __put_user (s.mem_unit, &info->mem_unit))
1139                 return -EFAULT;
1140
1141         return 0;
1142 }
1143
1144 /*
1145  * Allocate user-space memory for the duration of a single system call,
1146  * in order to marshall parameters inside a compat thunk.
1147  */
1148 void __user *compat_alloc_user_space(unsigned long len)
1149 {
1150         void __user *ptr;
1151
1152         /* If len would occupy more than half of the entire compat space... */
1153         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1154                 return NULL;
1155
1156         ptr = arch_compat_alloc_user_space(len);
1157
1158         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1159                 return NULL;
1160
1161         return ptr;
1162 }
1163 EXPORT_SYMBOL_GPL(compat_alloc_user_space);