linux/kernel/compat.c
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   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/export.h>
  25#include <linux/migrate.h>
  26#include <linux/posix-timers.h>
  27#include <linux/times.h>
  28#include <linux/ptrace.h>
  29#include <linux/gfp.h>
  30
  31#include <asm/uaccess.h>
  32
  33/*
  34 * Get/set struct timeval with struct timespec on the native side
  35 */
  36static int compat_get_timeval_convert(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
  48static int compat_put_timeval_convert(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
  55static 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
  85static 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
 113asmlinkage 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_convert(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
 130asmlinkage 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_convert(&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
 148int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
 149{
 150        return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
 151                        __get_user(tv->tv_sec, &ctv->tv_sec) ||
 152                        __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 153}
 154EXPORT_SYMBOL_GPL(get_compat_timeval);
 155
 156int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
 157{
 158        return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
 159                        __put_user(tv->tv_sec, &ctv->tv_sec) ||
 160                        __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
 161}
 162EXPORT_SYMBOL_GPL(put_compat_timeval);
 163
 164int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 165{
 166        return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 167                        __get_user(ts->tv_sec, &cts->tv_sec) ||
 168                        __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 169}
 170EXPORT_SYMBOL_GPL(get_compat_timespec);
 171
 172int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 173{
 174        return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 175                        __put_user(ts->tv_sec, &cts->tv_sec) ||
 176                        __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 177}
 178EXPORT_SYMBOL_GPL(put_compat_timespec);
 179
 180int compat_get_timeval(struct timeval *tv, const void __user *utv)
 181{
 182        if (COMPAT_USE_64BIT_TIME)
 183                return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
 184        else
 185                return get_compat_timeval(tv, utv);
 186}
 187EXPORT_SYMBOL_GPL(compat_get_timeval);
 188
 189int compat_put_timeval(const struct timeval *tv, void __user *utv)
 190{
 191        if (COMPAT_USE_64BIT_TIME)
 192                return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
 193        else
 194                return put_compat_timeval(tv, utv);
 195}
 196EXPORT_SYMBOL_GPL(compat_put_timeval);
 197
 198int compat_get_timespec(struct timespec *ts, const void __user *uts)
 199{
 200        if (COMPAT_USE_64BIT_TIME)
 201                return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
 202        else
 203                return get_compat_timespec(ts, uts);
 204}
 205EXPORT_SYMBOL_GPL(compat_get_timespec);
 206
 207int compat_put_timespec(const struct timespec *ts, void __user *uts)
 208{
 209        if (COMPAT_USE_64BIT_TIME)
 210                return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
 211        else
 212                return put_compat_timespec(ts, uts);
 213}
 214EXPORT_SYMBOL_GPL(compat_put_timespec);
 215
 216static long compat_nanosleep_restart(struct restart_block *restart)
 217{
 218        struct compat_timespec __user *rmtp;
 219        struct timespec rmt;
 220        mm_segment_t oldfs;
 221        long ret;
 222
 223        restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 224        oldfs = get_fs();
 225        set_fs(KERNEL_DS);
 226        ret = hrtimer_nanosleep_restart(restart);
 227        set_fs(oldfs);
 228
 229        if (ret) {
 230                rmtp = restart->nanosleep.compat_rmtp;
 231
 232                if (rmtp && put_compat_timespec(&rmt, rmtp))
 233                        return -EFAULT;
 234        }
 235
 236        return ret;
 237}
 238
 239asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 240                                     struct compat_timespec __user *rmtp)
 241{
 242        struct timespec tu, rmt;
 243        mm_segment_t oldfs;
 244        long ret;
 245
 246        if (get_compat_timespec(&tu, rqtp))
 247                return -EFAULT;
 248
 249        if (!timespec_valid(&tu))
 250                return -EINVAL;
 251
 252        oldfs = get_fs();
 253        set_fs(KERNEL_DS);
 254        ret = hrtimer_nanosleep(&tu,
 255                                rmtp ? (struct timespec __user *)&rmt : NULL,
 256                                HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 257        set_fs(oldfs);
 258
 259        if (ret) {
 260                struct restart_block *restart
 261                        = &current_thread_info()->restart_block;
 262
 263                restart->fn = compat_nanosleep_restart;
 264                restart->nanosleep.compat_rmtp = rmtp;
 265
 266                if (rmtp && put_compat_timespec(&rmt, rmtp))
 267                        return -EFAULT;
 268        }
 269
 270        return ret;
 271}
 272
 273static inline long get_compat_itimerval(struct itimerval *o,
 274                struct compat_itimerval __user *i)
 275{
 276        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 277                (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 278                 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 279                 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 280                 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 281}
 282
 283static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 284                struct itimerval *i)
 285{
 286        return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 287                (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 288                 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 289                 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 290                 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 291}
 292
 293COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
 294                struct compat_itimerval __user *, it)
 295{
 296        struct itimerval kit;
 297        int error;
 298
 299        error = do_getitimer(which, &kit);
 300        if (!error && put_compat_itimerval(it, &kit))
 301                error = -EFAULT;
 302        return error;
 303}
 304
 305COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
 306                struct compat_itimerval __user *, in,
 307                struct compat_itimerval __user *, out)
 308{
 309        struct itimerval kin, kout;
 310        int error;
 311
 312        if (in) {
 313                if (get_compat_itimerval(&kin, in))
 314                        return -EFAULT;
 315        } else
 316                memset(&kin, 0, sizeof(kin));
 317
 318        error = do_setitimer(which, &kin, out ? &kout : NULL);
 319        if (error || !out)
 320                return error;
 321        if (put_compat_itimerval(out, &kout))
 322                return -EFAULT;
 323        return 0;
 324}
 325
 326static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 327{
 328        return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 329}
 330
 331asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 332{
 333        if (tbuf) {
 334                struct tms tms;
 335                struct compat_tms tmp;
 336
 337                do_sys_times(&tms);
 338                /* Convert our struct tms to the compat version. */
 339                tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 340                tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 341                tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 342                tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 343                if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 344                        return -EFAULT;
 345        }
 346        force_successful_syscall_return();
 347        return compat_jiffies_to_clock_t(jiffies);
 348}
 349
 350#ifdef __ARCH_WANT_SYS_SIGPENDING
 351
 352/*
 353 * Assumption: old_sigset_t and compat_old_sigset_t are both
 354 * types that can be passed to put_user()/get_user().
 355 */
 356
 357asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 358{
 359        old_sigset_t s;
 360        long ret;
 361        mm_segment_t old_fs = get_fs();
 362
 363        set_fs(KERNEL_DS);
 364        ret = sys_sigpending((old_sigset_t __user *) &s);
 365        set_fs(old_fs);
 366        if (ret == 0)
 367                ret = put_user(s, set);
 368        return ret;
 369}
 370
 371#endif
 372
 373#ifdef __ARCH_WANT_SYS_SIGPROCMASK
 374
 375/*
 376 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 377 * blocked set of signals to the supplied signal set
 378 */
 379static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
 380{
 381        memcpy(blocked->sig, &set, sizeof(set));
 382}
 383
 384COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
 385                       compat_old_sigset_t __user *, nset,
 386                       compat_old_sigset_t __user *, oset)
 387{
 388        old_sigset_t old_set, new_set;
 389        sigset_t new_blocked;
 390
 391        old_set = current->blocked.sig[0];
 392
 393        if (nset) {
 394                if (get_user(new_set, nset))
 395                        return -EFAULT;
 396                new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
 397
 398                new_blocked = current->blocked;
 399
 400                switch (how) {
 401                case SIG_BLOCK:
 402                        sigaddsetmask(&new_blocked, new_set);
 403                        break;
 404                case SIG_UNBLOCK:
 405                        sigdelsetmask(&new_blocked, new_set);
 406                        break;
 407                case SIG_SETMASK:
 408                        compat_sig_setmask(&new_blocked, new_set);
 409                        break;
 410                default:
 411                        return -EINVAL;
 412                }
 413
 414                set_current_blocked(&new_blocked);
 415        }
 416
 417        if (oset) {
 418                if (put_user(old_set, oset))
 419                        return -EFAULT;
 420        }
 421
 422        return 0;
 423}
 424
 425#endif
 426
 427asmlinkage long compat_sys_setrlimit(unsigned int resource,
 428                struct compat_rlimit __user *rlim)
 429{
 430        struct rlimit r;
 431
 432        if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 433            __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 434            __get_user(r.rlim_max, &rlim->rlim_max))
 435                return -EFAULT;
 436
 437        if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 438                r.rlim_cur = RLIM_INFINITY;
 439        if (r.rlim_max == COMPAT_RLIM_INFINITY)
 440                r.rlim_max = RLIM_INFINITY;
 441        return do_prlimit(current, resource, &r, NULL);
 442}
 443
 444#ifdef COMPAT_RLIM_OLD_INFINITY
 445
 446asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 447                struct compat_rlimit __user *rlim)
 448{
 449        struct rlimit r;
 450        int ret;
 451        mm_segment_t old_fs = get_fs();
 452
 453        set_fs(KERNEL_DS);
 454        ret = sys_old_getrlimit(resource, &r);
 455        set_fs(old_fs);
 456
 457        if (!ret) {
 458                if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 459                        r.rlim_cur = COMPAT_RLIM_INFINITY;
 460                if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 461                        r.rlim_max = COMPAT_RLIM_INFINITY;
 462
 463                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 464                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 465                    __put_user(r.rlim_max, &rlim->rlim_max))
 466                        return -EFAULT;
 467        }
 468        return ret;
 469}
 470
 471#endif
 472
 473asmlinkage long compat_sys_getrlimit(unsigned int resource,
 474                struct compat_rlimit __user *rlim)
 475{
 476        struct rlimit r;
 477        int ret;
 478
 479        ret = do_prlimit(current, resource, NULL, &r);
 480        if (!ret) {
 481                if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 482                        r.rlim_cur = COMPAT_RLIM_INFINITY;
 483                if (r.rlim_max > COMPAT_RLIM_INFINITY)
 484                        r.rlim_max = COMPAT_RLIM_INFINITY;
 485
 486                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 487                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 488                    __put_user(r.rlim_max, &rlim->rlim_max))
 489                        return -EFAULT;
 490        }
 491        return ret;
 492}
 493
 494int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 495{
 496        if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 497            __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 498            __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 499            __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 500            __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 501            __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 502            __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 503            __put_user(r->ru_idrss, &ru->ru_idrss) ||
 504            __put_user(r->ru_isrss, &ru->ru_isrss) ||
 505            __put_user(r->ru_minflt, &ru->ru_minflt) ||
 506            __put_user(r->ru_majflt, &ru->ru_majflt) ||
 507            __put_user(r->ru_nswap, &ru->ru_nswap) ||
 508            __put_user(r->ru_inblock, &ru->ru_inblock) ||
 509            __put_user(r->ru_oublock, &ru->ru_oublock) ||
 510            __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 511            __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 512            __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 513            __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 514            __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 515                return -EFAULT;
 516        return 0;
 517}
 518
 519COMPAT_SYSCALL_DEFINE4(wait4,
 520        compat_pid_t, pid,
 521        compat_uint_t __user *, stat_addr,
 522        int, options,
 523        struct compat_rusage __user *, ru)
 524{
 525        if (!ru) {
 526                return sys_wait4(pid, stat_addr, options, NULL);
 527        } else {
 528                struct rusage r;
 529                int ret;
 530                unsigned int status;
 531                mm_segment_t old_fs = get_fs();
 532
 533                set_fs (KERNEL_DS);
 534                ret = sys_wait4(pid,
 535                                (stat_addr ?
 536                                 (unsigned int __user *) &status : NULL),
 537                                options, (struct rusage __user *) &r);
 538                set_fs (old_fs);
 539
 540                if (ret > 0) {
 541                        if (put_compat_rusage(&r, ru))
 542                                return -EFAULT;
 543                        if (stat_addr && put_user(status, stat_addr))
 544                                return -EFAULT;
 545                }
 546                return ret;
 547        }
 548}
 549
 550COMPAT_SYSCALL_DEFINE5(waitid,
 551                int, which, compat_pid_t, pid,
 552                struct compat_siginfo __user *, uinfo, int, options,
 553                struct compat_rusage __user *, uru)
 554{
 555        siginfo_t info;
 556        struct rusage ru;
 557        long ret;
 558        mm_segment_t old_fs = get_fs();
 559
 560        memset(&info, 0, sizeof(info));
 561
 562        set_fs(KERNEL_DS);
 563        ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 564                         uru ? (struct rusage __user *)&ru : NULL);
 565        set_fs(old_fs);
 566
 567        if ((ret < 0) || (info.si_signo == 0))
 568                return ret;
 569
 570        if (uru) {
 571                /* sys_waitid() overwrites everything in ru */
 572                if (COMPAT_USE_64BIT_TIME)
 573                        ret = copy_to_user(uru, &ru, sizeof(ru));
 574                else
 575                        ret = put_compat_rusage(&ru, uru);
 576                if (ret)
 577                        return -EFAULT;
 578        }
 579
 580        BUG_ON(info.si_code & __SI_MASK);
 581        info.si_code |= __SI_CHLD;
 582        return copy_siginfo_to_user32(uinfo, &info);
 583}
 584
 585static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 586                                    unsigned len, struct cpumask *new_mask)
 587{
 588        unsigned long *k;
 589
 590        if (len < cpumask_size())
 591                memset(new_mask, 0, cpumask_size());
 592        else if (len > cpumask_size())
 593                len = cpumask_size();
 594
 595        k = cpumask_bits(new_mask);
 596        return compat_get_bitmap(k, user_mask_ptr, len * 8);
 597}
 598
 599asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 600                                             unsigned int len,
 601                                             compat_ulong_t __user *user_mask_ptr)
 602{
 603        cpumask_var_t new_mask;
 604        int retval;
 605
 606        if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 607                return -ENOMEM;
 608
 609        retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 610        if (retval)
 611                goto out;
 612
 613        retval = sched_setaffinity(pid, new_mask);
 614out:
 615        free_cpumask_var(new_mask);
 616        return retval;
 617}
 618
 619asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 620                                             compat_ulong_t __user *user_mask_ptr)
 621{
 622        int ret;
 623        cpumask_var_t mask;
 624
 625        if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 626                return -EINVAL;
 627        if (len & (sizeof(compat_ulong_t)-1))
 628                return -EINVAL;
 629
 630        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 631                return -ENOMEM;
 632
 633        ret = sched_getaffinity(pid, mask);
 634        if (ret == 0) {
 635                size_t retlen = min_t(size_t, len, cpumask_size());
 636
 637                if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 638                        ret = -EFAULT;
 639                else
 640                        ret = retlen;
 641        }
 642        free_cpumask_var(mask);
 643
 644        return ret;
 645}
 646
 647int get_compat_itimerspec(struct itimerspec *dst,
 648                          const struct compat_itimerspec __user *src)
 649{
 650        if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 651            get_compat_timespec(&dst->it_value, &src->it_value))
 652                return -EFAULT;
 653        return 0;
 654}
 655
 656int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 657                          const struct itimerspec *src)
 658{
 659        if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 660            put_compat_timespec(&src->it_value, &dst->it_value))
 661                return -EFAULT;
 662        return 0;
 663}
 664
 665long compat_sys_timer_create(clockid_t which_clock,
 666                        struct compat_sigevent __user *timer_event_spec,
 667                        timer_t __user *created_timer_id)
 668{
 669        struct sigevent __user *event = NULL;
 670
 671        if (timer_event_spec) {
 672                struct sigevent kevent;
 673
 674                event = compat_alloc_user_space(sizeof(*event));
 675                if (get_compat_sigevent(&kevent, timer_event_spec) ||
 676                    copy_to_user(event, &kevent, sizeof(*event)))
 677                        return -EFAULT;
 678        }
 679
 680        return sys_timer_create(which_clock, event, created_timer_id);
 681}
 682
 683long compat_sys_timer_settime(timer_t timer_id, int flags,
 684                          struct compat_itimerspec __user *new,
 685                          struct compat_itimerspec __user *old)
 686{
 687        long err;
 688        mm_segment_t oldfs;
 689        struct itimerspec newts, oldts;
 690
 691        if (!new)
 692                return -EINVAL;
 693        if (get_compat_itimerspec(&newts, new))
 694                return -EFAULT;
 695        oldfs = get_fs();
 696        set_fs(KERNEL_DS);
 697        err = sys_timer_settime(timer_id, flags,
 698                                (struct itimerspec __user *) &newts,
 699                                (struct itimerspec __user *) &oldts);
 700        set_fs(oldfs);
 701        if (!err && old && put_compat_itimerspec(old, &oldts))
 702                return -EFAULT;
 703        return err;
 704}
 705
 706long compat_sys_timer_gettime(timer_t timer_id,
 707                struct compat_itimerspec __user *setting)
 708{
 709        long err;
 710        mm_segment_t oldfs;
 711        struct itimerspec ts;
 712
 713        oldfs = get_fs();
 714        set_fs(KERNEL_DS);
 715        err = sys_timer_gettime(timer_id,
 716                                (struct itimerspec __user *) &ts);
 717        set_fs(oldfs);
 718        if (!err && put_compat_itimerspec(setting, &ts))
 719                return -EFAULT;
 720        return err;
 721}
 722
 723long compat_sys_clock_settime(clockid_t which_clock,
 724                struct compat_timespec __user *tp)
 725{
 726        long err;
 727        mm_segment_t oldfs;
 728        struct timespec ts;
 729
 730        if (get_compat_timespec(&ts, tp))
 731                return -EFAULT;
 732        oldfs = get_fs();
 733        set_fs(KERNEL_DS);
 734        err = sys_clock_settime(which_clock,
 735                                (struct timespec __user *) &ts);
 736        set_fs(oldfs);
 737        return err;
 738}
 739
 740long compat_sys_clock_gettime(clockid_t which_clock,
 741                struct compat_timespec __user *tp)
 742{
 743        long err;
 744        mm_segment_t oldfs;
 745        struct timespec ts;
 746
 747        oldfs = get_fs();
 748        set_fs(KERNEL_DS);
 749        err = sys_clock_gettime(which_clock,
 750                                (struct timespec __user *) &ts);
 751        set_fs(oldfs);
 752        if (!err && put_compat_timespec(&ts, tp))
 753                return -EFAULT;
 754        return err;
 755}
 756
 757long compat_sys_clock_adjtime(clockid_t which_clock,
 758                struct compat_timex __user *utp)
 759{
 760        struct timex txc;
 761        mm_segment_t oldfs;
 762        int err, ret;
 763
 764        err = compat_get_timex(&txc, utp);
 765        if (err)
 766                return err;
 767
 768        oldfs = get_fs();
 769        set_fs(KERNEL_DS);
 770        ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 771        set_fs(oldfs);
 772
 773        err = compat_put_timex(utp, &txc);
 774        if (err)
 775                return err;
 776
 777        return ret;
 778}
 779
 780long compat_sys_clock_getres(clockid_t which_clock,
 781                struct compat_timespec __user *tp)
 782{
 783        long err;
 784        mm_segment_t oldfs;
 785        struct timespec ts;
 786
 787        oldfs = get_fs();
 788        set_fs(KERNEL_DS);
 789        err = sys_clock_getres(which_clock,
 790                               (struct timespec __user *) &ts);
 791        set_fs(oldfs);
 792        if (!err && tp && put_compat_timespec(&ts, tp))
 793                return -EFAULT;
 794        return err;
 795}
 796
 797static long compat_clock_nanosleep_restart(struct restart_block *restart)
 798{
 799        long err;
 800        mm_segment_t oldfs;
 801        struct timespec tu;
 802        struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 803
 804        restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 805        oldfs = get_fs();
 806        set_fs(KERNEL_DS);
 807        err = clock_nanosleep_restart(restart);
 808        set_fs(oldfs);
 809
 810        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 811            put_compat_timespec(&tu, rmtp))
 812                return -EFAULT;
 813
 814        if (err == -ERESTART_RESTARTBLOCK) {
 815                restart->fn = compat_clock_nanosleep_restart;
 816                restart->nanosleep.compat_rmtp = rmtp;
 817        }
 818        return err;
 819}
 820
 821long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 822                            struct compat_timespec __user *rqtp,
 823                            struct compat_timespec __user *rmtp)
 824{
 825        long err;
 826        mm_segment_t oldfs;
 827        struct timespec in, out;
 828        struct restart_block *restart;
 829
 830        if (get_compat_timespec(&in, rqtp))
 831                return -EFAULT;
 832
 833        oldfs = get_fs();
 834        set_fs(KERNEL_DS);
 835        err = sys_clock_nanosleep(which_clock, flags,
 836                                  (struct timespec __user *) &in,
 837                                  (struct timespec __user *) &out);
 838        set_fs(oldfs);
 839
 840        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 841            put_compat_timespec(&out, rmtp))
 842                return -EFAULT;
 843
 844        if (err == -ERESTART_RESTARTBLOCK) {
 845                restart = &current_thread_info()->restart_block;
 846                restart->fn = compat_clock_nanosleep_restart;
 847                restart->nanosleep.compat_rmtp = rmtp;
 848        }
 849        return err;
 850}
 851
 852/*
 853 * We currently only need the following fields from the sigevent
 854 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 855 * sigev_notify_thread_id).  The others are handled in user mode.
 856 * We also assume that copying sigev_value.sival_int is sufficient
 857 * to keep all the bits of sigev_value.sival_ptr intact.
 858 */
 859int get_compat_sigevent(struct sigevent *event,
 860                const struct compat_sigevent __user *u_event)
 861{
 862        memset(event, 0, sizeof(*event));
 863        return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 864                __get_user(event->sigev_value.sival_int,
 865                        &u_event->sigev_value.sival_int) ||
 866                __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 867                __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 868                __get_user(event->sigev_notify_thread_id,
 869                        &u_event->sigev_notify_thread_id))
 870                ? -EFAULT : 0;
 871}
 872
 873long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 874                       unsigned long bitmap_size)
 875{
 876        int i, j;
 877        unsigned long m;
 878        compat_ulong_t um;
 879        unsigned long nr_compat_longs;
 880
 881        /* align bitmap up to nearest compat_long_t boundary */
 882        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 883
 884        if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 885                return -EFAULT;
 886
 887        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 888
 889        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 890                m = 0;
 891
 892                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 893                        /*
 894                         * We dont want to read past the end of the userspace
 895                         * bitmap. We must however ensure the end of the
 896                         * kernel bitmap is zeroed.
 897                         */
 898                        if (nr_compat_longs-- > 0) {
 899                                if (__get_user(um, umask))
 900                                        return -EFAULT;
 901                        } else {
 902                                um = 0;
 903                        }
 904
 905                        umask++;
 906                        m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 907                }
 908                *mask++ = m;
 909        }
 910
 911        return 0;
 912}
 913
 914long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 915                       unsigned long bitmap_size)
 916{
 917        int i, j;
 918        unsigned long m;
 919        compat_ulong_t um;
 920        unsigned long nr_compat_longs;
 921
 922        /* align bitmap up to nearest compat_long_t boundary */
 923        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 924
 925        if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 926                return -EFAULT;
 927
 928        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 929
 930        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 931                m = *mask++;
 932
 933                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 934                        um = m;
 935
 936                        /*
 937                         * We dont want to write past the end of the userspace
 938                         * bitmap.
 939                         */
 940                        if (nr_compat_longs-- > 0) {
 941                                if (__put_user(um, umask))
 942                                        return -EFAULT;
 943                        }
 944
 945                        umask++;
 946                        m >>= 4*sizeof(um);
 947                        m >>= 4*sizeof(um);
 948                }
 949        }
 950
 951        return 0;
 952}
 953
 954void
 955sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
 956{
 957        switch (_NSIG_WORDS) {
 958        case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 959        case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 960        case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 961        case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 962        }
 963}
 964EXPORT_SYMBOL_GPL(sigset_from_compat);
 965
 966void
 967sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
 968{
 969        switch (_NSIG_WORDS) {
 970        case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
 971        case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
 972        case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
 973        case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
 974        }
 975}
 976
 977COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
 978                struct compat_siginfo __user *, uinfo,
 979                struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
 980{
 981        compat_sigset_t s32;
 982        sigset_t s;
 983        struct timespec t;
 984        siginfo_t info;
 985        long ret;
 986
 987        if (sigsetsize != sizeof(sigset_t))
 988                return -EINVAL;
 989
 990        if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 991                return -EFAULT;
 992        sigset_from_compat(&s, &s32);
 993
 994        if (uts) {
 995                if (compat_get_timespec(&t, uts))
 996                        return -EFAULT;
 997        }
 998
 999        ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1000
1001        if (ret > 0 && uinfo) {
1002                if (copy_siginfo_to_user32(uinfo, &info))
1003                        ret = -EFAULT;
1004        }
1005
1006        return ret;
1007}
1008
1009#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1010
1011/* compat_time_t is a 32 bit "long" and needs to get converted. */
1012
1013asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1014{
1015        compat_time_t i;
1016        struct timeval tv;
1017
1018        do_gettimeofday(&tv);
1019        i = tv.tv_sec;
1020
1021        if (tloc) {
1022                if (put_user(i,tloc))
1023                        return -EFAULT;
1024        }
1025        force_successful_syscall_return();
1026        return i;
1027}
1028
1029asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1030{
1031        struct timespec tv;
1032        int err;
1033
1034        if (get_user(tv.tv_sec, tptr))
1035                return -EFAULT;
1036
1037        tv.tv_nsec = 0;
1038
1039        err = security_settime(&tv, NULL);
1040        if (err)
1041                return err;
1042
1043        do_settimeofday(&tv);
1044        return 0;
1045}
1046
1047#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1048
1049asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1050{
1051        struct timex txc;
1052        int err, ret;
1053
1054        err = compat_get_timex(&txc, utp);
1055        if (err)
1056                return err;
1057
1058        ret = do_adjtimex(&txc);
1059
1060        err = compat_put_timex(utp, &txc);
1061        if (err)
1062                return err;
1063
1064        return ret;
1065}
1066
1067#ifdef CONFIG_NUMA
1068asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1069                compat_uptr_t __user *pages32,
1070                const int __user *nodes,
1071                int __user *status,
1072                int flags)
1073{
1074        const void __user * __user *pages;
1075        int i;
1076
1077        pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1078        for (i = 0; i < nr_pages; i++) {
1079                compat_uptr_t p;
1080
1081                if (get_user(p, pages32 + i) ||
1082                        put_user(compat_ptr(p), pages + i))
1083                        return -EFAULT;
1084        }
1085        return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1086}
1087
1088asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1089                        compat_ulong_t maxnode,
1090                        const compat_ulong_t __user *old_nodes,
1091                        const compat_ulong_t __user *new_nodes)
1092{
1093        unsigned long __user *old = NULL;
1094        unsigned long __user *new = NULL;
1095        nodemask_t tmp_mask;
1096        unsigned long nr_bits;
1097        unsigned long size;
1098
1099        nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1100        size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1101        if (old_nodes) {
1102                if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1103                        return -EFAULT;
1104                old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1105                if (new_nodes)
1106                        new = old + size / sizeof(unsigned long);
1107                if (copy_to_user(old, nodes_addr(tmp_mask), size))
1108                        return -EFAULT;
1109        }
1110        if (new_nodes) {
1111                if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1112                        return -EFAULT;
1113                if (new == NULL)
1114                        new = compat_alloc_user_space(size);
1115                if (copy_to_user(new, nodes_addr(tmp_mask), size))
1116                        return -EFAULT;
1117        }
1118        return sys_migrate_pages(pid, nr_bits + 1, old, new);
1119}
1120#endif
1121
1122COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1123                       compat_pid_t, pid,
1124                       struct compat_timespec __user *, interval)
1125{
1126        struct timespec t;
1127        int ret;
1128        mm_segment_t old_fs = get_fs();
1129
1130        set_fs(KERNEL_DS);
1131        ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1132        set_fs(old_fs);
1133        if (put_compat_timespec(&t, interval))
1134                return -EFAULT;
1135        return ret;
1136}
1137
1138/*
1139 * Allocate user-space memory for the duration of a single system call,
1140 * in order to marshall parameters inside a compat thunk.
1141 */
1142void __user *compat_alloc_user_space(unsigned long len)
1143{
1144        void __user *ptr;
1145
1146        /* If len would occupy more than half of the entire compat space... */
1147        if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1148                return NULL;
1149
1150        ptr = arch_compat_alloc_user_space(len);
1151
1152        if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1153                return NULL;
1154
1155        return ptr;
1156}
1157EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1158
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