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/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 */
  36static 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
  48static 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
  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(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(&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_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
 155int 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}
 161EXPORT_SYMBOL_GPL(put_compat_timespec);
 162
 163static 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
 186asmlinkage 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
 220static 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
 230static 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
 240asmlinkage 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
 252asmlinkage 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
 273static 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
 278asmlinkage 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
 304asmlinkage 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
 322asmlinkage 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
 345asmlinkage 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
 364asmlinkage 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
 391asmlinkage 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
 412int 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
 437asmlinkage 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
 456asmlinkage long
 457compat_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
 485asmlinkage 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
 515static 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
 529asmlinkage 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);
 544out:
 545        free_cpumask_var(new_mask);
 546        return retval;
 547}
 548
 549asmlinkage 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
 577int 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
 586int 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
 595long 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
 613long 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
 636long 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
 653long 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
 670long 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
 687long 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
 710long 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
 727static 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
 751long 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 */
 789int 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
 803long 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
 844long 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
 884void
 885sigset_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}
 894EXPORT_SYMBOL_GPL(sigset_from_compat);
 895
 896asmlinkage long
 897compat_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
 930asmlinkage long
 931compat_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
 945asmlinkage 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
 961asmlinkage 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
 982asmlinkage 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
1006asmlinkage 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
1025asmlinkage 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
1045asmlinkage 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
1079struct 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
1096asmlinkage long
1097compat_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 */
1148void __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}
1163EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1164
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