linux/kernel/compat.c
<<
>>
Prefs
   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 * Note that the native side is already converted to a timespec, because
  35 * that's what we want anyway.
  36 */
  37static int compat_get_timeval(struct timespec *o,
  38                struct compat_timeval __user *i)
  39{
  40        long usec;
  41
  42        if (get_user(o->tv_sec, &i->tv_sec) ||
  43            get_user(usec, &i->tv_usec))
  44                return -EFAULT;
  45        o->tv_nsec = usec * 1000;
  46        return 0;
  47}
  48
  49static int compat_put_timeval(struct compat_timeval __user *o,
  50                struct timeval *i)
  51{
  52        return (put_user(i->tv_sec, &o->tv_sec) ||
  53                put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
  54}
  55
  56static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
  57{
  58        memset(txc, 0, sizeof(struct timex));
  59
  60        if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
  61                        __get_user(txc->modes, &utp->modes) ||
  62                        __get_user(txc->offset, &utp->offset) ||
  63                        __get_user(txc->freq, &utp->freq) ||
  64                        __get_user(txc->maxerror, &utp->maxerror) ||
  65                        __get_user(txc->esterror, &utp->esterror) ||
  66                        __get_user(txc->status, &utp->status) ||
  67                        __get_user(txc->constant, &utp->constant) ||
  68                        __get_user(txc->precision, &utp->precision) ||
  69                        __get_user(txc->tolerance, &utp->tolerance) ||
  70                        __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  71                        __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
  72                        __get_user(txc->tick, &utp->tick) ||
  73                        __get_user(txc->ppsfreq, &utp->ppsfreq) ||
  74                        __get_user(txc->jitter, &utp->jitter) ||
  75                        __get_user(txc->shift, &utp->shift) ||
  76                        __get_user(txc->stabil, &utp->stabil) ||
  77                        __get_user(txc->jitcnt, &utp->jitcnt) ||
  78                        __get_user(txc->calcnt, &utp->calcnt) ||
  79                        __get_user(txc->errcnt, &utp->errcnt) ||
  80                        __get_user(txc->stbcnt, &utp->stbcnt))
  81                return -EFAULT;
  82
  83        return 0;
  84}
  85
  86static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
  87{
  88        if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
  89                        __put_user(txc->modes, &utp->modes) ||
  90                        __put_user(txc->offset, &utp->offset) ||
  91                        __put_user(txc->freq, &utp->freq) ||
  92                        __put_user(txc->maxerror, &utp->maxerror) ||
  93                        __put_user(txc->esterror, &utp->esterror) ||
  94                        __put_user(txc->status, &utp->status) ||
  95                        __put_user(txc->constant, &utp->constant) ||
  96                        __put_user(txc->precision, &utp->precision) ||
  97                        __put_user(txc->tolerance, &utp->tolerance) ||
  98                        __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
  99                        __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 100                        __put_user(txc->tick, &utp->tick) ||
 101                        __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 102                        __put_user(txc->jitter, &utp->jitter) ||
 103                        __put_user(txc->shift, &utp->shift) ||
 104                        __put_user(txc->stabil, &utp->stabil) ||
 105                        __put_user(txc->jitcnt, &utp->jitcnt) ||
 106                        __put_user(txc->calcnt, &utp->calcnt) ||
 107                        __put_user(txc->errcnt, &utp->errcnt) ||
 108                        __put_user(txc->stbcnt, &utp->stbcnt) ||
 109                        __put_user(txc->tai, &utp->tai))
 110                return -EFAULT;
 111        return 0;
 112}
 113
 114asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 115                struct timezone __user *tz)
 116{
 117        if (tv) {
 118                struct timeval ktv;
 119                do_gettimeofday(&ktv);
 120                if (compat_put_timeval(tv, &ktv))
 121                        return -EFAULT;
 122        }
 123        if (tz) {
 124                if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 125                        return -EFAULT;
 126        }
 127
 128        return 0;
 129}
 130
 131asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 132                struct timezone __user *tz)
 133{
 134        struct timespec kts;
 135        struct timezone ktz;
 136
 137        if (tv) {
 138                if (compat_get_timeval(&kts, tv))
 139                        return -EFAULT;
 140        }
 141        if (tz) {
 142                if (copy_from_user(&ktz, tz, sizeof(ktz)))
 143                        return -EFAULT;
 144        }
 145
 146        return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 147}
 148
 149int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 150{
 151        return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 152                        __get_user(ts->tv_sec, &cts->tv_sec) ||
 153                        __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 154}
 155
 156int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 157{
 158        return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
 159                        __put_user(ts->tv_sec, &cts->tv_sec) ||
 160                        __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 161}
 162EXPORT_SYMBOL_GPL(put_compat_timespec);
 163
 164static long compat_nanosleep_restart(struct restart_block *restart)
 165{
 166        struct compat_timespec __user *rmtp;
 167        struct timespec rmt;
 168        mm_segment_t oldfs;
 169        long ret;
 170
 171        restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
 172        oldfs = get_fs();
 173        set_fs(KERNEL_DS);
 174        ret = hrtimer_nanosleep_restart(restart);
 175        set_fs(oldfs);
 176
 177        if (ret) {
 178                rmtp = restart->nanosleep.compat_rmtp;
 179
 180                if (rmtp && put_compat_timespec(&rmt, rmtp))
 181                        return -EFAULT;
 182        }
 183
 184        return ret;
 185}
 186
 187asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
 188                                     struct compat_timespec __user *rmtp)
 189{
 190        struct timespec tu, rmt;
 191        mm_segment_t oldfs;
 192        long ret;
 193
 194        if (get_compat_timespec(&tu, rqtp))
 195                return -EFAULT;
 196
 197        if (!timespec_valid(&tu))
 198                return -EINVAL;
 199
 200        oldfs = get_fs();
 201        set_fs(KERNEL_DS);
 202        ret = hrtimer_nanosleep(&tu,
 203                                rmtp ? (struct timespec __user *)&rmt : NULL,
 204                                HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 205        set_fs(oldfs);
 206
 207        if (ret) {
 208                struct restart_block *restart
 209                        = &current_thread_info()->restart_block;
 210
 211                restart->fn = compat_nanosleep_restart;
 212                restart->nanosleep.compat_rmtp = rmtp;
 213
 214                if (rmtp && put_compat_timespec(&rmt, rmtp))
 215                        return -EFAULT;
 216        }
 217
 218        return ret;
 219}
 220
 221static inline long get_compat_itimerval(struct itimerval *o,
 222                struct compat_itimerval __user *i)
 223{
 224        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
 225                (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
 226                 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
 227                 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
 228                 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
 229}
 230
 231static inline long put_compat_itimerval(struct compat_itimerval __user *o,
 232                struct itimerval *i)
 233{
 234        return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 235                (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
 236                 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
 237                 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
 238                 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
 239}
 240
 241asmlinkage long compat_sys_getitimer(int which,
 242                struct compat_itimerval __user *it)
 243{
 244        struct itimerval kit;
 245        int error;
 246
 247        error = do_getitimer(which, &kit);
 248        if (!error && put_compat_itimerval(it, &kit))
 249                error = -EFAULT;
 250        return error;
 251}
 252
 253asmlinkage long compat_sys_setitimer(int which,
 254                struct compat_itimerval __user *in,
 255                struct compat_itimerval __user *out)
 256{
 257        struct itimerval kin, kout;
 258        int error;
 259
 260        if (in) {
 261                if (get_compat_itimerval(&kin, in))
 262                        return -EFAULT;
 263        } else
 264                memset(&kin, 0, sizeof(kin));
 265
 266        error = do_setitimer(which, &kin, out ? &kout : NULL);
 267        if (error || !out)
 268                return error;
 269        if (put_compat_itimerval(out, &kout))
 270                return -EFAULT;
 271        return 0;
 272}
 273
 274static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
 275{
 276        return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
 277}
 278
 279asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 280{
 281        if (tbuf) {
 282                struct tms tms;
 283                struct compat_tms tmp;
 284
 285                do_sys_times(&tms);
 286                /* Convert our struct tms to the compat version. */
 287                tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
 288                tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
 289                tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
 290                tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 291                if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 292                        return -EFAULT;
 293        }
 294        force_successful_syscall_return();
 295        return compat_jiffies_to_clock_t(jiffies);
 296}
 297
 298#ifdef __ARCH_WANT_SYS_SIGPENDING
 299
 300/*
 301 * Assumption: old_sigset_t and compat_old_sigset_t are both
 302 * types that can be passed to put_user()/get_user().
 303 */
 304
 305asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
 306{
 307        old_sigset_t s;
 308        long ret;
 309        mm_segment_t old_fs = get_fs();
 310
 311        set_fs(KERNEL_DS);
 312        ret = sys_sigpending((old_sigset_t __user *) &s);
 313        set_fs(old_fs);
 314        if (ret == 0)
 315                ret = put_user(s, set);
 316        return ret;
 317}
 318
 319#endif
 320
 321#ifdef __ARCH_WANT_SYS_SIGPROCMASK
 322
 323asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
 324                compat_old_sigset_t __user *oset)
 325{
 326        old_sigset_t s;
 327        long ret;
 328        mm_segment_t old_fs;
 329
 330        if (set && get_user(s, set))
 331                return -EFAULT;
 332        old_fs = get_fs();
 333        set_fs(KERNEL_DS);
 334        ret = sys_sigprocmask(how,
 335                              set ? (old_sigset_t __user *) &s : NULL,
 336                              oset ? (old_sigset_t __user *) &s : NULL);
 337        set_fs(old_fs);
 338        if (ret == 0)
 339                if (oset)
 340                        ret = put_user(s, oset);
 341        return ret;
 342}
 343
 344#endif
 345
 346asmlinkage long compat_sys_setrlimit(unsigned int resource,
 347                struct compat_rlimit __user *rlim)
 348{
 349        struct rlimit r;
 350
 351        if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
 352            __get_user(r.rlim_cur, &rlim->rlim_cur) ||
 353            __get_user(r.rlim_max, &rlim->rlim_max))
 354                return -EFAULT;
 355
 356        if (r.rlim_cur == COMPAT_RLIM_INFINITY)
 357                r.rlim_cur = RLIM_INFINITY;
 358        if (r.rlim_max == COMPAT_RLIM_INFINITY)
 359                r.rlim_max = RLIM_INFINITY;
 360        return do_prlimit(current, resource, &r, NULL);
 361}
 362
 363#ifdef COMPAT_RLIM_OLD_INFINITY
 364
 365asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 366                struct compat_rlimit __user *rlim)
 367{
 368        struct rlimit r;
 369        int ret;
 370        mm_segment_t old_fs = get_fs();
 371
 372        set_fs(KERNEL_DS);
 373        ret = sys_old_getrlimit(resource, &r);
 374        set_fs(old_fs);
 375
 376        if (!ret) {
 377                if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
 378                        r.rlim_cur = COMPAT_RLIM_INFINITY;
 379                if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
 380                        r.rlim_max = COMPAT_RLIM_INFINITY;
 381
 382                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 383                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 384                    __put_user(r.rlim_max, &rlim->rlim_max))
 385                        return -EFAULT;
 386        }
 387        return ret;
 388}
 389
 390#endif
 391
 392asmlinkage long compat_sys_getrlimit(unsigned int resource,
 393                struct compat_rlimit __user *rlim)
 394{
 395        struct rlimit r;
 396        int ret;
 397
 398        ret = do_prlimit(current, resource, NULL, &r);
 399        if (!ret) {
 400                if (r.rlim_cur > COMPAT_RLIM_INFINITY)
 401                        r.rlim_cur = COMPAT_RLIM_INFINITY;
 402                if (r.rlim_max > COMPAT_RLIM_INFINITY)
 403                        r.rlim_max = COMPAT_RLIM_INFINITY;
 404
 405                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
 406                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
 407                    __put_user(r.rlim_max, &rlim->rlim_max))
 408                        return -EFAULT;
 409        }
 410        return ret;
 411}
 412
 413int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
 414{
 415        if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
 416            __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
 417            __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
 418            __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
 419            __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
 420            __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
 421            __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
 422            __put_user(r->ru_idrss, &ru->ru_idrss) ||
 423            __put_user(r->ru_isrss, &ru->ru_isrss) ||
 424            __put_user(r->ru_minflt, &ru->ru_minflt) ||
 425            __put_user(r->ru_majflt, &ru->ru_majflt) ||
 426            __put_user(r->ru_nswap, &ru->ru_nswap) ||
 427            __put_user(r->ru_inblock, &ru->ru_inblock) ||
 428            __put_user(r->ru_oublock, &ru->ru_oublock) ||
 429            __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
 430            __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
 431            __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
 432            __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
 433            __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
 434                return -EFAULT;
 435        return 0;
 436}
 437
 438asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
 439{
 440        struct rusage r;
 441        int ret;
 442        mm_segment_t old_fs = get_fs();
 443
 444        set_fs(KERNEL_DS);
 445        ret = sys_getrusage(who, (struct rusage __user *) &r);
 446        set_fs(old_fs);
 447
 448        if (ret)
 449                return ret;
 450
 451        if (put_compat_rusage(&r, ru))
 452                return -EFAULT;
 453
 454        return 0;
 455}
 456
 457asmlinkage long
 458compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
 459        struct compat_rusage __user *ru)
 460{
 461        if (!ru) {
 462                return sys_wait4(pid, stat_addr, options, NULL);
 463        } else {
 464                struct rusage r;
 465                int ret;
 466                unsigned int status;
 467                mm_segment_t old_fs = get_fs();
 468
 469                set_fs (KERNEL_DS);
 470                ret = sys_wait4(pid,
 471                                (stat_addr ?
 472                                 (unsigned int __user *) &status : NULL),
 473                                options, (struct rusage __user *) &r);
 474                set_fs (old_fs);
 475
 476                if (ret > 0) {
 477                        if (put_compat_rusage(&r, ru))
 478                                return -EFAULT;
 479                        if (stat_addr && put_user(status, stat_addr))
 480                                return -EFAULT;
 481                }
 482                return ret;
 483        }
 484}
 485
 486asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
 487                struct compat_siginfo __user *uinfo, int options,
 488                struct compat_rusage __user *uru)
 489{
 490        siginfo_t info;
 491        struct rusage ru;
 492        long ret;
 493        mm_segment_t old_fs = get_fs();
 494
 495        memset(&info, 0, sizeof(info));
 496
 497        set_fs(KERNEL_DS);
 498        ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
 499                         uru ? (struct rusage __user *)&ru : NULL);
 500        set_fs(old_fs);
 501
 502        if ((ret < 0) || (info.si_signo == 0))
 503                return ret;
 504
 505        if (uru) {
 506                ret = put_compat_rusage(&ru, uru);
 507                if (ret)
 508                        return ret;
 509        }
 510
 511        BUG_ON(info.si_code & __SI_MASK);
 512        info.si_code |= __SI_CHLD;
 513        return copy_siginfo_to_user32(uinfo, &info);
 514}
 515
 516static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
 517                                    unsigned len, struct cpumask *new_mask)
 518{
 519        unsigned long *k;
 520
 521        if (len < cpumask_size())
 522                memset(new_mask, 0, cpumask_size());
 523        else if (len > cpumask_size())
 524                len = cpumask_size();
 525
 526        k = cpumask_bits(new_mask);
 527        return compat_get_bitmap(k, user_mask_ptr, len * 8);
 528}
 529
 530asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
 531                                             unsigned int len,
 532                                             compat_ulong_t __user *user_mask_ptr)
 533{
 534        cpumask_var_t new_mask;
 535        int retval;
 536
 537        if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
 538                return -ENOMEM;
 539
 540        retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
 541        if (retval)
 542                goto out;
 543
 544        retval = sched_setaffinity(pid, new_mask);
 545out:
 546        free_cpumask_var(new_mask);
 547        return retval;
 548}
 549
 550asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 551                                             compat_ulong_t __user *user_mask_ptr)
 552{
 553        int ret;
 554        cpumask_var_t mask;
 555
 556        if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 557                return -EINVAL;
 558        if (len & (sizeof(compat_ulong_t)-1))
 559                return -EINVAL;
 560
 561        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 562                return -ENOMEM;
 563
 564        ret = sched_getaffinity(pid, mask);
 565        if (ret == 0) {
 566                size_t retlen = min_t(size_t, len, cpumask_size());
 567
 568                if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
 569                        ret = -EFAULT;
 570                else
 571                        ret = retlen;
 572        }
 573        free_cpumask_var(mask);
 574
 575        return ret;
 576}
 577
 578int get_compat_itimerspec(struct itimerspec *dst,
 579                          const struct compat_itimerspec __user *src)
 580{
 581        if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
 582            get_compat_timespec(&dst->it_value, &src->it_value))
 583                return -EFAULT;
 584        return 0;
 585}
 586
 587int put_compat_itimerspec(struct compat_itimerspec __user *dst,
 588                          const struct itimerspec *src)
 589{
 590        if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
 591            put_compat_timespec(&src->it_value, &dst->it_value))
 592                return -EFAULT;
 593        return 0;
 594}
 595
 596long compat_sys_timer_create(clockid_t which_clock,
 597                        struct compat_sigevent __user *timer_event_spec,
 598                        timer_t __user *created_timer_id)
 599{
 600        struct sigevent __user *event = NULL;
 601
 602        if (timer_event_spec) {
 603                struct sigevent kevent;
 604
 605                event = compat_alloc_user_space(sizeof(*event));
 606                if (get_compat_sigevent(&kevent, timer_event_spec) ||
 607                    copy_to_user(event, &kevent, sizeof(*event)))
 608                        return -EFAULT;
 609        }
 610
 611        return sys_timer_create(which_clock, event, created_timer_id);
 612}
 613
 614long compat_sys_timer_settime(timer_t timer_id, int flags,
 615                          struct compat_itimerspec __user *new,
 616                          struct compat_itimerspec __user *old)
 617{
 618        long err;
 619        mm_segment_t oldfs;
 620        struct itimerspec newts, oldts;
 621
 622        if (!new)
 623                return -EINVAL;
 624        if (get_compat_itimerspec(&newts, new))
 625                return -EFAULT;
 626        oldfs = get_fs();
 627        set_fs(KERNEL_DS);
 628        err = sys_timer_settime(timer_id, flags,
 629                                (struct itimerspec __user *) &newts,
 630                                (struct itimerspec __user *) &oldts);
 631        set_fs(oldfs);
 632        if (!err && old && put_compat_itimerspec(old, &oldts))
 633                return -EFAULT;
 634        return err;
 635}
 636
 637long compat_sys_timer_gettime(timer_t timer_id,
 638                struct compat_itimerspec __user *setting)
 639{
 640        long err;
 641        mm_segment_t oldfs;
 642        struct itimerspec ts;
 643
 644        oldfs = get_fs();
 645        set_fs(KERNEL_DS);
 646        err = sys_timer_gettime(timer_id,
 647                                (struct itimerspec __user *) &ts);
 648        set_fs(oldfs);
 649        if (!err && put_compat_itimerspec(setting, &ts))
 650                return -EFAULT;
 651        return err;
 652}
 653
 654long compat_sys_clock_settime(clockid_t which_clock,
 655                struct compat_timespec __user *tp)
 656{
 657        long err;
 658        mm_segment_t oldfs;
 659        struct timespec ts;
 660
 661        if (get_compat_timespec(&ts, tp))
 662                return -EFAULT;
 663        oldfs = get_fs();
 664        set_fs(KERNEL_DS);
 665        err = sys_clock_settime(which_clock,
 666                                (struct timespec __user *) &ts);
 667        set_fs(oldfs);
 668        return err;
 669}
 670
 671long compat_sys_clock_gettime(clockid_t which_clock,
 672                struct compat_timespec __user *tp)
 673{
 674        long err;
 675        mm_segment_t oldfs;
 676        struct timespec ts;
 677
 678        oldfs = get_fs();
 679        set_fs(KERNEL_DS);
 680        err = sys_clock_gettime(which_clock,
 681                                (struct timespec __user *) &ts);
 682        set_fs(oldfs);
 683        if (!err && put_compat_timespec(&ts, tp))
 684                return -EFAULT;
 685        return err;
 686}
 687
 688long compat_sys_clock_adjtime(clockid_t which_clock,
 689                struct compat_timex __user *utp)
 690{
 691        struct timex txc;
 692        mm_segment_t oldfs;
 693        int err, ret;
 694
 695        err = compat_get_timex(&txc, utp);
 696        if (err)
 697                return err;
 698
 699        oldfs = get_fs();
 700        set_fs(KERNEL_DS);
 701        ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
 702        set_fs(oldfs);
 703
 704        err = compat_put_timex(utp, &txc);
 705        if (err)
 706                return err;
 707
 708        return ret;
 709}
 710
 711long compat_sys_clock_getres(clockid_t which_clock,
 712                struct compat_timespec __user *tp)
 713{
 714        long err;
 715        mm_segment_t oldfs;
 716        struct timespec ts;
 717
 718        oldfs = get_fs();
 719        set_fs(KERNEL_DS);
 720        err = sys_clock_getres(which_clock,
 721                               (struct timespec __user *) &ts);
 722        set_fs(oldfs);
 723        if (!err && tp && put_compat_timespec(&ts, tp))
 724                return -EFAULT;
 725        return err;
 726}
 727
 728static long compat_clock_nanosleep_restart(struct restart_block *restart)
 729{
 730        long err;
 731        mm_segment_t oldfs;
 732        struct timespec tu;
 733        struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
 734
 735        restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 736        oldfs = get_fs();
 737        set_fs(KERNEL_DS);
 738        err = clock_nanosleep_restart(restart);
 739        set_fs(oldfs);
 740
 741        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 742            put_compat_timespec(&tu, rmtp))
 743                return -EFAULT;
 744
 745        if (err == -ERESTART_RESTARTBLOCK) {
 746                restart->fn = compat_clock_nanosleep_restart;
 747                restart->nanosleep.compat_rmtp = rmtp;
 748        }
 749        return err;
 750}
 751
 752long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
 753                            struct compat_timespec __user *rqtp,
 754                            struct compat_timespec __user *rmtp)
 755{
 756        long err;
 757        mm_segment_t oldfs;
 758        struct timespec in, out;
 759        struct restart_block *restart;
 760
 761        if (get_compat_timespec(&in, rqtp))
 762                return -EFAULT;
 763
 764        oldfs = get_fs();
 765        set_fs(KERNEL_DS);
 766        err = sys_clock_nanosleep(which_clock, flags,
 767                                  (struct timespec __user *) &in,
 768                                  (struct timespec __user *) &out);
 769        set_fs(oldfs);
 770
 771        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
 772            put_compat_timespec(&out, rmtp))
 773                return -EFAULT;
 774
 775        if (err == -ERESTART_RESTARTBLOCK) {
 776                restart = &current_thread_info()->restart_block;
 777                restart->fn = compat_clock_nanosleep_restart;
 778                restart->nanosleep.compat_rmtp = rmtp;
 779        }
 780        return err;
 781}
 782
 783/*
 784 * We currently only need the following fields from the sigevent
 785 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 786 * sigev_notify_thread_id).  The others are handled in user mode.
 787 * We also assume that copying sigev_value.sival_int is sufficient
 788 * to keep all the bits of sigev_value.sival_ptr intact.
 789 */
 790int get_compat_sigevent(struct sigevent *event,
 791                const struct compat_sigevent __user *u_event)
 792{
 793        memset(event, 0, sizeof(*event));
 794        return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
 795                __get_user(event->sigev_value.sival_int,
 796                        &u_event->sigev_value.sival_int) ||
 797                __get_user(event->sigev_signo, &u_event->sigev_signo) ||
 798                __get_user(event->sigev_notify, &u_event->sigev_notify) ||
 799                __get_user(event->sigev_notify_thread_id,
 800                        &u_event->sigev_notify_thread_id))
 801                ? -EFAULT : 0;
 802}
 803
 804long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 805                       unsigned long bitmap_size)
 806{
 807        int i, j;
 808        unsigned long m;
 809        compat_ulong_t um;
 810        unsigned long nr_compat_longs;
 811
 812        /* align bitmap up to nearest compat_long_t boundary */
 813        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 814
 815        if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
 816                return -EFAULT;
 817
 818        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 819
 820        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 821                m = 0;
 822
 823                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 824                        /*
 825                         * We dont want to read past the end of the userspace
 826                         * bitmap. We must however ensure the end of the
 827                         * kernel bitmap is zeroed.
 828                         */
 829                        if (nr_compat_longs-- > 0) {
 830                                if (__get_user(um, umask))
 831                                        return -EFAULT;
 832                        } else {
 833                                um = 0;
 834                        }
 835
 836                        umask++;
 837                        m |= (long)um << (j * BITS_PER_COMPAT_LONG);
 838                }
 839                *mask++ = m;
 840        }
 841
 842        return 0;
 843}
 844
 845long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 846                       unsigned long bitmap_size)
 847{
 848        int i, j;
 849        unsigned long m;
 850        compat_ulong_t um;
 851        unsigned long nr_compat_longs;
 852
 853        /* align bitmap up to nearest compat_long_t boundary */
 854        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
 855
 856        if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
 857                return -EFAULT;
 858
 859        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
 860
 861        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
 862                m = *mask++;
 863
 864                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
 865                        um = m;
 866
 867                        /*
 868                         * We dont want to write past the end of the userspace
 869                         * bitmap.
 870                         */
 871                        if (nr_compat_longs-- > 0) {
 872                                if (__put_user(um, umask))
 873                                        return -EFAULT;
 874                        }
 875
 876                        umask++;
 877                        m >>= 4*sizeof(um);
 878                        m >>= 4*sizeof(um);
 879                }
 880        }
 881
 882        return 0;
 883}
 884
 885void
 886sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
 887{
 888        switch (_NSIG_WORDS) {
 889        case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
 890        case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
 891        case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
 892        case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
 893        }
 894}
 895EXPORT_SYMBOL_GPL(sigset_from_compat);
 896
 897asmlinkage long
 898compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 899                struct compat_siginfo __user *uinfo,
 900                struct compat_timespec __user *uts, compat_size_t sigsetsize)
 901{
 902        compat_sigset_t s32;
 903        sigset_t s;
 904        struct timespec t;
 905        siginfo_t info;
 906        long ret;
 907
 908        if (sigsetsize != sizeof(sigset_t))
 909                return -EINVAL;
 910
 911        if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
 912                return -EFAULT;
 913        sigset_from_compat(&s, &s32);
 914
 915        if (uts) {
 916                if (get_compat_timespec(&t, uts))
 917                        return -EFAULT;
 918        }
 919
 920        ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
 921
 922        if (ret > 0 && uinfo) {
 923                if (copy_siginfo_to_user32(uinfo, &info))
 924                        ret = -EFAULT;
 925        }
 926
 927        return ret;
 928
 929}
 930
 931asmlinkage long
 932compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
 933                             struct compat_siginfo __user *uinfo)
 934{
 935        siginfo_t info;
 936
 937        if (copy_siginfo_from_user32(&info, uinfo))
 938                return -EFAULT;
 939        return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
 940}
 941
 942#ifdef __ARCH_WANT_COMPAT_SYS_TIME
 943
 944/* compat_time_t is a 32 bit "long" and needs to get converted. */
 945
 946asmlinkage long compat_sys_time(compat_time_t __user * tloc)
 947{
 948        compat_time_t i;
 949        struct timeval tv;
 950
 951        do_gettimeofday(&tv);
 952        i = tv.tv_sec;
 953
 954        if (tloc) {
 955                if (put_user(i,tloc))
 956                        return -EFAULT;
 957        }
 958        force_successful_syscall_return();
 959        return i;
 960}
 961
 962asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
 963{
 964        struct timespec tv;
 965        int err;
 966
 967        if (get_user(tv.tv_sec, tptr))
 968                return -EFAULT;
 969
 970        tv.tv_nsec = 0;
 971
 972        err = security_settime(&tv, NULL);
 973        if (err)
 974                return err;
 975
 976        do_settimeofday(&tv);
 977        return 0;
 978}
 979
 980#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
 981
 982#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 983asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 984{
 985        sigset_t newset;
 986        compat_sigset_t newset32;
 987
 988        /* XXX: Don't preclude handling different sized sigset_t's.  */
 989        if (sigsetsize != sizeof(sigset_t))
 990                return -EINVAL;
 991
 992        if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
 993                return -EFAULT;
 994        sigset_from_compat(&newset, &newset32);
 995        sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 996
 997        current->saved_sigmask = current->blocked;
 998        set_current_blocked(&newset);
 999
1000        current->state = TASK_INTERRUPTIBLE;
1001        schedule();
1002        set_restore_sigmask();
1003        return -ERESTARTNOHAND;
1004}
1005#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1006
1007asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1008{
1009        struct timex txc;
1010        int err, ret;
1011
1012        err = compat_get_timex(&txc, utp);
1013        if (err)
1014                return err;
1015
1016        ret = do_adjtimex(&txc);
1017
1018        err = compat_put_timex(utp, &txc);
1019        if (err)
1020                return err;
1021
1022        return ret;
1023}
1024
1025#ifdef CONFIG_NUMA
1026asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1027                compat_uptr_t __user *pages32,
1028                const int __user *nodes,
1029                int __user *status,
1030                int flags)
1031{
1032        const void __user * __user *pages;
1033        int i;
1034
1035        pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1036        for (i = 0; i < nr_pages; i++) {
1037                compat_uptr_t p;
1038
1039                if (get_user(p, pages32 + i) ||
1040                        put_user(compat_ptr(p), pages + i))
1041                        return -EFAULT;
1042        }
1043        return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1044}
1045
1046asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1047                        compat_ulong_t maxnode,
1048                        const compat_ulong_t __user *old_nodes,
1049                        const compat_ulong_t __user *new_nodes)
1050{
1051        unsigned long __user *old = NULL;
1052        unsigned long __user *new = NULL;
1053        nodemask_t tmp_mask;
1054        unsigned long nr_bits;
1055        unsigned long size;
1056
1057        nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1058        size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1059        if (old_nodes) {
1060                if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1061                        return -EFAULT;
1062                old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1063                if (new_nodes)
1064                        new = old + size / sizeof(unsigned long);
1065                if (copy_to_user(old, nodes_addr(tmp_mask), size))
1066                        return -EFAULT;
1067        }
1068        if (new_nodes) {
1069                if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1070                        return -EFAULT;
1071                if (new == NULL)
1072                        new = compat_alloc_user_space(size);
1073                if (copy_to_user(new, nodes_addr(tmp_mask), size))
1074                        return -EFAULT;
1075        }
1076        return sys_migrate_pages(pid, nr_bits + 1, old, new);
1077}
1078#endif
1079
1080struct compat_sysinfo {
1081        s32 uptime;
1082        u32 loads[3];
1083        u32 totalram;
1084        u32 freeram;
1085        u32 sharedram;
1086        u32 bufferram;
1087        u32 totalswap;
1088        u32 freeswap;
1089        u16 procs;
1090        u16 pad;
1091        u32 totalhigh;
1092        u32 freehigh;
1093        u32 mem_unit;
1094        char _f[20-2*sizeof(u32)-sizeof(int)];
1095};
1096
1097asmlinkage long
1098compat_sys_sysinfo(struct compat_sysinfo __user *info)
1099{
1100        struct sysinfo s;
1101
1102        do_sysinfo(&s);
1103
1104        /* Check to see if any memory value is too large for 32-bit and scale
1105         *  down if needed
1106         */
1107        if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1108                int bitcount = 0;
1109
1110                while (s.mem_unit < PAGE_SIZE) {
1111                        s.mem_unit <<= 1;
1112                        bitcount++;
1113                }
1114
1115                s.totalram >>= bitcount;
1116                s.freeram >>= bitcount;
1117                s.sharedram >>= bitcount;
1118                s.bufferram >>= bitcount;
1119                s.totalswap >>= bitcount;
1120                s.freeswap >>= bitcount;
1121                s.totalhigh >>= bitcount;
1122                s.freehigh >>= bitcount;
1123        }
1124
1125        if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1126            __put_user (s.uptime, &info->uptime) ||
1127            __put_user (s.loads[0], &info->loads[0]) ||
1128            __put_user (s.loads[1], &info->loads[1]) ||
1129            __put_user (s.loads[2], &info->loads[2]) ||
1130            __put_user (s.totalram, &info->totalram) ||
1131            __put_user (s.freeram, &info->freeram) ||
1132            __put_user (s.sharedram, &info->sharedram) ||
1133            __put_user (s.bufferram, &info->bufferram) ||
1134            __put_user (s.totalswap, &info->totalswap) ||
1135            __put_user (s.freeswap, &info->freeswap) ||
1136            __put_user (s.procs, &info->procs) ||
1137            __put_user (s.totalhigh, &info->totalhigh) ||
1138            __put_user (s.freehigh, &info->freehigh) ||
1139            __put_user (s.mem_unit, &info->mem_unit))
1140                return -EFAULT;
1141
1142        return 0;
1143}
1144
1145/*
1146 * Allocate user-space memory for the duration of a single system call,
1147 * in order to marshall parameters inside a compat thunk.
1148 */
1149void __user *compat_alloc_user_space(unsigned long len)
1150{
1151        void __user *ptr;
1152
1153        /* If len would occupy more than half of the entire compat space... */
1154        if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1155                return NULL;
1156
1157        ptr = arch_compat_alloc_user_space(len);
1158
1159        if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1160                return NULL;
1161
1162        return ptr;
1163}
1164EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1165