Root/kernel/compat.c

1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
23#include <linux/timex.h>
24#include <linux/migrate.h>
25#include <linux/posix-timers.h>
26#include <linux/times.h>
27#include <linux/ptrace.h>
28#include <linux/gfp.h>
29
30#include <asm/uaccess.h>
31
32/*
33 * Note that the native side is already converted to a timespec, because
34 * that's what we want anyway.
35 */
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
55asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
56        struct timezone __user *tz)
57{
58    if (tv) {
59        struct timeval ktv;
60        do_gettimeofday(&ktv);
61        if (compat_put_timeval(tv, &ktv))
62            return -EFAULT;
63    }
64    if (tz) {
65        if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
66            return -EFAULT;
67    }
68
69    return 0;
70}
71
72asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
73        struct timezone __user *tz)
74{
75    struct timespec kts;
76    struct timezone ktz;
77
78    if (tv) {
79        if (compat_get_timeval(&kts, tv))
80            return -EFAULT;
81    }
82    if (tz) {
83        if (copy_from_user(&ktz, tz, sizeof(ktz)))
84            return -EFAULT;
85    }
86
87    return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
88}
89
90int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
91{
92    return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
93            __get_user(ts->tv_sec, &cts->tv_sec) ||
94            __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
95}
96
97int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
98{
99    return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
100            __put_user(ts->tv_sec, &cts->tv_sec) ||
101            __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
102}
103
104static long compat_nanosleep_restart(struct restart_block *restart)
105{
106    struct compat_timespec __user *rmtp;
107    struct timespec rmt;
108    mm_segment_t oldfs;
109    long ret;
110
111    restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
112    oldfs = get_fs();
113    set_fs(KERNEL_DS);
114    ret = hrtimer_nanosleep_restart(restart);
115    set_fs(oldfs);
116
117    if (ret) {
118        rmtp = restart->nanosleep.compat_rmtp;
119
120        if (rmtp && put_compat_timespec(&rmt, rmtp))
121            return -EFAULT;
122    }
123
124    return ret;
125}
126
127asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
128                     struct compat_timespec __user *rmtp)
129{
130    struct timespec tu, rmt;
131    mm_segment_t oldfs;
132    long ret;
133
134    if (get_compat_timespec(&tu, rqtp))
135        return -EFAULT;
136
137    if (!timespec_valid(&tu))
138        return -EINVAL;
139
140    oldfs = get_fs();
141    set_fs(KERNEL_DS);
142    ret = hrtimer_nanosleep(&tu,
143                rmtp ? (struct timespec __user *)&rmt : NULL,
144                HRTIMER_MODE_REL, CLOCK_MONOTONIC);
145    set_fs(oldfs);
146
147    if (ret) {
148        struct restart_block *restart
149            = &current_thread_info()->restart_block;
150
151        restart->fn = compat_nanosleep_restart;
152        restart->nanosleep.compat_rmtp = rmtp;
153
154        if (rmtp && put_compat_timespec(&rmt, rmtp))
155            return -EFAULT;
156    }
157
158    return ret;
159}
160
161static inline long get_compat_itimerval(struct itimerval *o,
162        struct compat_itimerval __user *i)
163{
164    return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
165        (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
166         __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
167         __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
168         __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
169}
170
171static inline long put_compat_itimerval(struct compat_itimerval __user *o,
172        struct itimerval *i)
173{
174    return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
175        (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
176         __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
177         __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
178         __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
179}
180
181asmlinkage long compat_sys_getitimer(int which,
182        struct compat_itimerval __user *it)
183{
184    struct itimerval kit;
185    int error;
186
187    error = do_getitimer(which, &kit);
188    if (!error && put_compat_itimerval(it, &kit))
189        error = -EFAULT;
190    return error;
191}
192
193asmlinkage long compat_sys_setitimer(int which,
194        struct compat_itimerval __user *in,
195        struct compat_itimerval __user *out)
196{
197    struct itimerval kin, kout;
198    int error;
199
200    if (in) {
201        if (get_compat_itimerval(&kin, in))
202            return -EFAULT;
203    } else
204        memset(&kin, 0, sizeof(kin));
205
206    error = do_setitimer(which, &kin, out ? &kout : NULL);
207    if (error || !out)
208        return error;
209    if (put_compat_itimerval(out, &kout))
210        return -EFAULT;
211    return 0;
212}
213
214static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
215{
216    return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
217}
218
219asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
220{
221    if (tbuf) {
222        struct tms tms;
223        struct compat_tms tmp;
224
225        do_sys_times(&tms);
226        /* Convert our struct tms to the compat version. */
227        tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
228        tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
229        tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
230        tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
231        if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
232            return -EFAULT;
233    }
234    force_successful_syscall_return();
235    return compat_jiffies_to_clock_t(jiffies);
236}
237
238/*
239 * Assumption: old_sigset_t and compat_old_sigset_t are both
240 * types that can be passed to put_user()/get_user().
241 */
242
243asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
244{
245    old_sigset_t s;
246    long ret;
247    mm_segment_t old_fs = get_fs();
248
249    set_fs(KERNEL_DS);
250    ret = sys_sigpending((old_sigset_t __user *) &s);
251    set_fs(old_fs);
252    if (ret == 0)
253        ret = put_user(s, set);
254    return ret;
255}
256
257asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
258        compat_old_sigset_t __user *oset)
259{
260    old_sigset_t s;
261    long ret;
262    mm_segment_t old_fs;
263
264    if (set && get_user(s, set))
265        return -EFAULT;
266    old_fs = get_fs();
267    set_fs(KERNEL_DS);
268    ret = sys_sigprocmask(how,
269                  set ? (old_sigset_t __user *) &s : NULL,
270                  oset ? (old_sigset_t __user *) &s : NULL);
271    set_fs(old_fs);
272    if (ret == 0)
273        if (oset)
274            ret = put_user(s, oset);
275    return ret;
276}
277
278asmlinkage long compat_sys_setrlimit(unsigned int resource,
279        struct compat_rlimit __user *rlim)
280{
281    struct rlimit r;
282
283    if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
284        __get_user(r.rlim_cur, &rlim->rlim_cur) ||
285        __get_user(r.rlim_max, &rlim->rlim_max))
286        return -EFAULT;
287
288    if (r.rlim_cur == COMPAT_RLIM_INFINITY)
289        r.rlim_cur = RLIM_INFINITY;
290    if (r.rlim_max == COMPAT_RLIM_INFINITY)
291        r.rlim_max = RLIM_INFINITY;
292    return do_prlimit(current, resource, &r, NULL);
293}
294
295#ifdef COMPAT_RLIM_OLD_INFINITY
296
297asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
298        struct compat_rlimit __user *rlim)
299{
300    struct rlimit r;
301    int ret;
302    mm_segment_t old_fs = get_fs();
303
304    set_fs(KERNEL_DS);
305    ret = sys_old_getrlimit(resource, &r);
306    set_fs(old_fs);
307
308    if (!ret) {
309        if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
310            r.rlim_cur = COMPAT_RLIM_INFINITY;
311        if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
312            r.rlim_max = COMPAT_RLIM_INFINITY;
313
314        if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
315            __put_user(r.rlim_cur, &rlim->rlim_cur) ||
316            __put_user(r.rlim_max, &rlim->rlim_max))
317            return -EFAULT;
318    }
319    return ret;
320}
321
322#endif
323
324asmlinkage long compat_sys_getrlimit(unsigned int resource,
325        struct compat_rlimit __user *rlim)
326{
327    struct rlimit r;
328    int ret;
329
330    ret = do_prlimit(current, resource, NULL, &r);
331    if (!ret) {
332        if (r.rlim_cur > COMPAT_RLIM_INFINITY)
333            r.rlim_cur = COMPAT_RLIM_INFINITY;
334        if (r.rlim_max > COMPAT_RLIM_INFINITY)
335            r.rlim_max = COMPAT_RLIM_INFINITY;
336
337        if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
338            __put_user(r.rlim_cur, &rlim->rlim_cur) ||
339            __put_user(r.rlim_max, &rlim->rlim_max))
340            return -EFAULT;
341    }
342    return ret;
343}
344
345int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
346{
347    if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
348        __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
349        __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
350        __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
351        __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
352        __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
353        __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
354        __put_user(r->ru_idrss, &ru->ru_idrss) ||
355        __put_user(r->ru_isrss, &ru->ru_isrss) ||
356        __put_user(r->ru_minflt, &ru->ru_minflt) ||
357        __put_user(r->ru_majflt, &ru->ru_majflt) ||
358        __put_user(r->ru_nswap, &ru->ru_nswap) ||
359        __put_user(r->ru_inblock, &ru->ru_inblock) ||
360        __put_user(r->ru_oublock, &ru->ru_oublock) ||
361        __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
362        __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
363        __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
364        __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
365        __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
366        return -EFAULT;
367    return 0;
368}
369
370asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
371{
372    struct rusage r;
373    int ret;
374    mm_segment_t old_fs = get_fs();
375
376    set_fs(KERNEL_DS);
377    ret = sys_getrusage(who, (struct rusage __user *) &r);
378    set_fs(old_fs);
379
380    if (ret)
381        return ret;
382
383    if (put_compat_rusage(&r, ru))
384        return -EFAULT;
385
386    return 0;
387}
388
389asmlinkage long
390compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
391    struct compat_rusage __user *ru)
392{
393    if (!ru) {
394        return sys_wait4(pid, stat_addr, options, NULL);
395    } else {
396        struct rusage r;
397        int ret;
398        unsigned int status;
399        mm_segment_t old_fs = get_fs();
400
401        set_fs (KERNEL_DS);
402        ret = sys_wait4(pid,
403                (stat_addr ?
404                 (unsigned int __user *) &status : NULL),
405                options, (struct rusage __user *) &r);
406        set_fs (old_fs);
407
408        if (ret > 0) {
409            if (put_compat_rusage(&r, ru))
410                return -EFAULT;
411            if (stat_addr && put_user(status, stat_addr))
412                return -EFAULT;
413        }
414        return ret;
415    }
416}
417
418asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
419        struct compat_siginfo __user *uinfo, int options,
420        struct compat_rusage __user *uru)
421{
422    siginfo_t info;
423    struct rusage ru;
424    long ret;
425    mm_segment_t old_fs = get_fs();
426
427    memset(&info, 0, sizeof(info));
428
429    set_fs(KERNEL_DS);
430    ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
431             uru ? (struct rusage __user *)&ru : NULL);
432    set_fs(old_fs);
433
434    if ((ret < 0) || (info.si_signo == 0))
435        return ret;
436
437    if (uru) {
438        ret = put_compat_rusage(&ru, uru);
439        if (ret)
440            return ret;
441    }
442
443    BUG_ON(info.si_code & __SI_MASK);
444    info.si_code |= __SI_CHLD;
445    return copy_siginfo_to_user32(uinfo, &info);
446}
447
448static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
449                    unsigned len, struct cpumask *new_mask)
450{
451    unsigned long *k;
452
453    if (len < cpumask_size())
454        memset(new_mask, 0, cpumask_size());
455    else if (len > cpumask_size())
456        len = cpumask_size();
457
458    k = cpumask_bits(new_mask);
459    return compat_get_bitmap(k, user_mask_ptr, len * 8);
460}
461
462asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
463                         unsigned int len,
464                         compat_ulong_t __user *user_mask_ptr)
465{
466    cpumask_var_t new_mask;
467    int retval;
468
469    if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
470        return -ENOMEM;
471
472    retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
473    if (retval)
474        goto out;
475
476    retval = sched_setaffinity(pid, new_mask);
477out:
478    free_cpumask_var(new_mask);
479    return retval;
480}
481
482asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
483                         compat_ulong_t __user *user_mask_ptr)
484{
485    int ret;
486    cpumask_var_t mask;
487
488    if ((len * BITS_PER_BYTE) < nr_cpu_ids)
489        return -EINVAL;
490    if (len & (sizeof(compat_ulong_t)-1))
491        return -EINVAL;
492
493    if (!alloc_cpumask_var(&mask, GFP_KERNEL))
494        return -ENOMEM;
495
496    ret = sched_getaffinity(pid, mask);
497    if (ret == 0) {
498        size_t retlen = min_t(size_t, len, cpumask_size());
499
500        if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
501            ret = -EFAULT;
502        else
503            ret = retlen;
504    }
505    free_cpumask_var(mask);
506
507    return ret;
508}
509
510int get_compat_itimerspec(struct itimerspec *dst,
511              const struct compat_itimerspec __user *src)
512{
513    if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
514        get_compat_timespec(&dst->it_value, &src->it_value))
515        return -EFAULT;
516    return 0;
517}
518
519int put_compat_itimerspec(struct compat_itimerspec __user *dst,
520              const struct itimerspec *src)
521{
522    if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
523        put_compat_timespec(&src->it_value, &dst->it_value))
524        return -EFAULT;
525    return 0;
526}
527
528long compat_sys_timer_create(clockid_t which_clock,
529            struct compat_sigevent __user *timer_event_spec,
530            timer_t __user *created_timer_id)
531{
532    struct sigevent __user *event = NULL;
533
534    if (timer_event_spec) {
535        struct sigevent kevent;
536
537        event = compat_alloc_user_space(sizeof(*event));
538        if (get_compat_sigevent(&kevent, timer_event_spec) ||
539            copy_to_user(event, &kevent, sizeof(*event)))
540            return -EFAULT;
541    }
542
543    return sys_timer_create(which_clock, event, created_timer_id);
544}
545
546long compat_sys_timer_settime(timer_t timer_id, int flags,
547              struct compat_itimerspec __user *new,
548              struct compat_itimerspec __user *old)
549{
550    long err;
551    mm_segment_t oldfs;
552    struct itimerspec newts, oldts;
553
554    if (!new)
555        return -EINVAL;
556    if (get_compat_itimerspec(&newts, new))
557        return -EFAULT;
558    oldfs = get_fs();
559    set_fs(KERNEL_DS);
560    err = sys_timer_settime(timer_id, flags,
561                (struct itimerspec __user *) &newts,
562                (struct itimerspec __user *) &oldts);
563    set_fs(oldfs);
564    if (!err && old && put_compat_itimerspec(old, &oldts))
565        return -EFAULT;
566    return err;
567}
568
569long compat_sys_timer_gettime(timer_t timer_id,
570        struct compat_itimerspec __user *setting)
571{
572    long err;
573    mm_segment_t oldfs;
574    struct itimerspec ts;
575
576    oldfs = get_fs();
577    set_fs(KERNEL_DS);
578    err = sys_timer_gettime(timer_id,
579                (struct itimerspec __user *) &ts);
580    set_fs(oldfs);
581    if (!err && put_compat_itimerspec(setting, &ts))
582        return -EFAULT;
583    return err;
584}
585
586long compat_sys_clock_settime(clockid_t which_clock,
587        struct compat_timespec __user *tp)
588{
589    long err;
590    mm_segment_t oldfs;
591    struct timespec ts;
592
593    if (get_compat_timespec(&ts, tp))
594        return -EFAULT;
595    oldfs = get_fs();
596    set_fs(KERNEL_DS);
597    err = sys_clock_settime(which_clock,
598                (struct timespec __user *) &ts);
599    set_fs(oldfs);
600    return err;
601}
602
603long compat_sys_clock_gettime(clockid_t which_clock,
604        struct compat_timespec __user *tp)
605{
606    long err;
607    mm_segment_t oldfs;
608    struct timespec ts;
609
610    oldfs = get_fs();
611    set_fs(KERNEL_DS);
612    err = sys_clock_gettime(which_clock,
613                (struct timespec __user *) &ts);
614    set_fs(oldfs);
615    if (!err && put_compat_timespec(&ts, tp))
616        return -EFAULT;
617    return err;
618}
619
620long compat_sys_clock_getres(clockid_t which_clock,
621        struct compat_timespec __user *tp)
622{
623    long err;
624    mm_segment_t oldfs;
625    struct timespec ts;
626
627    oldfs = get_fs();
628    set_fs(KERNEL_DS);
629    err = sys_clock_getres(which_clock,
630                   (struct timespec __user *) &ts);
631    set_fs(oldfs);
632    if (!err && tp && put_compat_timespec(&ts, tp))
633        return -EFAULT;
634    return err;
635}
636
637static long compat_clock_nanosleep_restart(struct restart_block *restart)
638{
639    long err;
640    mm_segment_t oldfs;
641    struct timespec tu;
642    struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
643
644    restart->nanosleep.rmtp = (struct timespec __user *) &tu;
645    oldfs = get_fs();
646    set_fs(KERNEL_DS);
647    err = clock_nanosleep_restart(restart);
648    set_fs(oldfs);
649
650    if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
651        put_compat_timespec(&tu, rmtp))
652        return -EFAULT;
653
654    if (err == -ERESTART_RESTARTBLOCK) {
655        restart->fn = compat_clock_nanosleep_restart;
656        restart->nanosleep.compat_rmtp = rmtp;
657    }
658    return err;
659}
660
661long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
662                struct compat_timespec __user *rqtp,
663                struct compat_timespec __user *rmtp)
664{
665    long err;
666    mm_segment_t oldfs;
667    struct timespec in, out;
668    struct restart_block *restart;
669
670    if (get_compat_timespec(&in, rqtp))
671        return -EFAULT;
672
673    oldfs = get_fs();
674    set_fs(KERNEL_DS);
675    err = sys_clock_nanosleep(which_clock, flags,
676                  (struct timespec __user *) &in,
677                  (struct timespec __user *) &out);
678    set_fs(oldfs);
679
680    if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
681        put_compat_timespec(&out, rmtp))
682        return -EFAULT;
683
684    if (err == -ERESTART_RESTARTBLOCK) {
685        restart = &current_thread_info()->restart_block;
686        restart->fn = compat_clock_nanosleep_restart;
687        restart->nanosleep.compat_rmtp = rmtp;
688    }
689    return err;
690}
691
692/*
693 * We currently only need the following fields from the sigevent
694 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
695 * sigev_notify_thread_id). The others are handled in user mode.
696 * We also assume that copying sigev_value.sival_int is sufficient
697 * to keep all the bits of sigev_value.sival_ptr intact.
698 */
699int get_compat_sigevent(struct sigevent *event,
700        const struct compat_sigevent __user *u_event)
701{
702    memset(event, 0, sizeof(*event));
703    return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
704        __get_user(event->sigev_value.sival_int,
705            &u_event->sigev_value.sival_int) ||
706        __get_user(event->sigev_signo, &u_event->sigev_signo) ||
707        __get_user(event->sigev_notify, &u_event->sigev_notify) ||
708        __get_user(event->sigev_notify_thread_id,
709            &u_event->sigev_notify_thread_id))
710        ? -EFAULT : 0;
711}
712
713long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
714               unsigned long bitmap_size)
715{
716    int i, j;
717    unsigned long m;
718    compat_ulong_t um;
719    unsigned long nr_compat_longs;
720
721    /* align bitmap up to nearest compat_long_t boundary */
722    bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
723
724    if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
725        return -EFAULT;
726
727    nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
728
729    for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
730        m = 0;
731
732        for (j = 0; j < sizeof(m)/sizeof(um); j++) {
733            /*
734             * We dont want to read past the end of the userspace
735             * bitmap. We must however ensure the end of the
736             * kernel bitmap is zeroed.
737             */
738            if (nr_compat_longs-- > 0) {
739                if (__get_user(um, umask))
740                    return -EFAULT;
741            } else {
742                um = 0;
743            }
744
745            umask++;
746            m |= (long)um << (j * BITS_PER_COMPAT_LONG);
747        }
748        *mask++ = m;
749    }
750
751    return 0;
752}
753
754long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
755               unsigned long bitmap_size)
756{
757    int i, j;
758    unsigned long m;
759    compat_ulong_t um;
760    unsigned long nr_compat_longs;
761
762    /* align bitmap up to nearest compat_long_t boundary */
763    bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
764
765    if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
766        return -EFAULT;
767
768    nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
769
770    for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
771        m = *mask++;
772
773        for (j = 0; j < sizeof(m)/sizeof(um); j++) {
774            um = m;
775
776            /*
777             * We dont want to write past the end of the userspace
778             * bitmap.
779             */
780            if (nr_compat_longs-- > 0) {
781                if (__put_user(um, umask))
782                    return -EFAULT;
783            }
784
785            umask++;
786            m >>= 4*sizeof(um);
787            m >>= 4*sizeof(um);
788        }
789    }
790
791    return 0;
792}
793
794void
795sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
796{
797    switch (_NSIG_WORDS) {
798    case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
799    case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
800    case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
801    case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
802    }
803}
804
805asmlinkage long
806compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
807        struct compat_siginfo __user *uinfo,
808        struct compat_timespec __user *uts, compat_size_t sigsetsize)
809{
810    compat_sigset_t s32;
811    sigset_t s;
812    int sig;
813    struct timespec t;
814    siginfo_t info;
815    long ret, timeout = 0;
816
817    if (sigsetsize != sizeof(sigset_t))
818        return -EINVAL;
819
820    if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
821        return -EFAULT;
822    sigset_from_compat(&s, &s32);
823    sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
824    signotset(&s);
825
826    if (uts) {
827        if (get_compat_timespec (&t, uts))
828            return -EFAULT;
829        if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
830                || t.tv_sec < 0)
831            return -EINVAL;
832    }
833
834    spin_lock_irq(&current->sighand->siglock);
835    sig = dequeue_signal(current, &s, &info);
836    if (!sig) {
837        timeout = MAX_SCHEDULE_TIMEOUT;
838        if (uts)
839            timeout = timespec_to_jiffies(&t)
840                +(t.tv_sec || t.tv_nsec);
841        if (timeout) {
842            current->real_blocked = current->blocked;
843            sigandsets(&current->blocked, &current->blocked, &s);
844
845            recalc_sigpending();
846            spin_unlock_irq(&current->sighand->siglock);
847
848            timeout = schedule_timeout_interruptible(timeout);
849
850            spin_lock_irq(&current->sighand->siglock);
851            sig = dequeue_signal(current, &s, &info);
852            current->blocked = current->real_blocked;
853            siginitset(&current->real_blocked, 0);
854            recalc_sigpending();
855        }
856    }
857    spin_unlock_irq(&current->sighand->siglock);
858
859    if (sig) {
860        ret = sig;
861        if (uinfo) {
862            if (copy_siginfo_to_user32(uinfo, &info))
863                ret = -EFAULT;
864        }
865    }else {
866        ret = timeout?-EINTR:-EAGAIN;
867    }
868    return ret;
869
870}
871
872asmlinkage long
873compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
874                 struct compat_siginfo __user *uinfo)
875{
876    siginfo_t info;
877
878    if (copy_siginfo_from_user32(&info, uinfo))
879        return -EFAULT;
880    return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
881}
882
883#ifdef __ARCH_WANT_COMPAT_SYS_TIME
884
885/* compat_time_t is a 32 bit "long" and needs to get converted. */
886
887asmlinkage long compat_sys_time(compat_time_t __user * tloc)
888{
889    compat_time_t i;
890    struct timeval tv;
891
892    do_gettimeofday(&tv);
893    i = tv.tv_sec;
894
895    if (tloc) {
896        if (put_user(i,tloc))
897            return -EFAULT;
898    }
899    force_successful_syscall_return();
900    return i;
901}
902
903asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
904{
905    struct timespec tv;
906    int err;
907
908    if (get_user(tv.tv_sec, tptr))
909        return -EFAULT;
910
911    tv.tv_nsec = 0;
912
913    err = security_settime(&tv, NULL);
914    if (err)
915        return err;
916
917    do_settimeofday(&tv);
918    return 0;
919}
920
921#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
922
923#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
924asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
925{
926    sigset_t newset;
927    compat_sigset_t newset32;
928
929    /* XXX: Don't preclude handling different sized sigset_t's. */
930    if (sigsetsize != sizeof(sigset_t))
931        return -EINVAL;
932
933    if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
934        return -EFAULT;
935    sigset_from_compat(&newset, &newset32);
936    sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
937
938    spin_lock_irq(&current->sighand->siglock);
939    current->saved_sigmask = current->blocked;
940    current->blocked = newset;
941    recalc_sigpending();
942    spin_unlock_irq(&current->sighand->siglock);
943
944    current->state = TASK_INTERRUPTIBLE;
945    schedule();
946    set_restore_sigmask();
947    return -ERESTARTNOHAND;
948}
949#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
950
951asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
952{
953    struct timex txc;
954    int ret;
955
956    memset(&txc, 0, sizeof(struct timex));
957
958    if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
959            __get_user(txc.modes, &utp->modes) ||
960            __get_user(txc.offset, &utp->offset) ||
961            __get_user(txc.freq, &utp->freq) ||
962            __get_user(txc.maxerror, &utp->maxerror) ||
963            __get_user(txc.esterror, &utp->esterror) ||
964            __get_user(txc.status, &utp->status) ||
965            __get_user(txc.constant, &utp->constant) ||
966            __get_user(txc.precision, &utp->precision) ||
967            __get_user(txc.tolerance, &utp->tolerance) ||
968            __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
969            __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
970            __get_user(txc.tick, &utp->tick) ||
971            __get_user(txc.ppsfreq, &utp->ppsfreq) ||
972            __get_user(txc.jitter, &utp->jitter) ||
973            __get_user(txc.shift, &utp->shift) ||
974            __get_user(txc.stabil, &utp->stabil) ||
975            __get_user(txc.jitcnt, &utp->jitcnt) ||
976            __get_user(txc.calcnt, &utp->calcnt) ||
977            __get_user(txc.errcnt, &utp->errcnt) ||
978            __get_user(txc.stbcnt, &utp->stbcnt))
979        return -EFAULT;
980
981    ret = do_adjtimex(&txc);
982
983    if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
984            __put_user(txc.modes, &utp->modes) ||
985            __put_user(txc.offset, &utp->offset) ||
986            __put_user(txc.freq, &utp->freq) ||
987            __put_user(txc.maxerror, &utp->maxerror) ||
988            __put_user(txc.esterror, &utp->esterror) ||
989            __put_user(txc.status, &utp->status) ||
990            __put_user(txc.constant, &utp->constant) ||
991            __put_user(txc.precision, &utp->precision) ||
992            __put_user(txc.tolerance, &utp->tolerance) ||
993            __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
994            __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
995            __put_user(txc.tick, &utp->tick) ||
996            __put_user(txc.ppsfreq, &utp->ppsfreq) ||
997            __put_user(txc.jitter, &utp->jitter) ||
998            __put_user(txc.shift, &utp->shift) ||
999            __put_user(txc.stabil, &utp->stabil) ||
1000            __put_user(txc.jitcnt, &utp->jitcnt) ||
1001            __put_user(txc.calcnt, &utp->calcnt) ||
1002            __put_user(txc.errcnt, &utp->errcnt) ||
1003            __put_user(txc.stbcnt, &utp->stbcnt) ||
1004            __put_user(txc.tai, &utp->tai))
1005        ret = -EFAULT;
1006
1007    return ret;
1008}
1009
1010#ifdef CONFIG_NUMA
1011asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1012        compat_uptr_t __user *pages32,
1013        const int __user *nodes,
1014        int __user *status,
1015        int flags)
1016{
1017    const void __user * __user *pages;
1018    int i;
1019
1020    pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1021    for (i = 0; i < nr_pages; i++) {
1022        compat_uptr_t p;
1023
1024        if (get_user(p, pages32 + i) ||
1025            put_user(compat_ptr(p), pages + i))
1026            return -EFAULT;
1027    }
1028    return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1029}
1030
1031asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1032            compat_ulong_t maxnode,
1033            const compat_ulong_t __user *old_nodes,
1034            const compat_ulong_t __user *new_nodes)
1035{
1036    unsigned long __user *old = NULL;
1037    unsigned long __user *new = NULL;
1038    nodemask_t tmp_mask;
1039    unsigned long nr_bits;
1040    unsigned long size;
1041
1042    nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1043    size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1044    if (old_nodes) {
1045        if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1046            return -EFAULT;
1047        old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1048        if (new_nodes)
1049            new = old + size / sizeof(unsigned long);
1050        if (copy_to_user(old, nodes_addr(tmp_mask), size))
1051            return -EFAULT;
1052    }
1053    if (new_nodes) {
1054        if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1055            return -EFAULT;
1056        if (new == NULL)
1057            new = compat_alloc_user_space(size);
1058        if (copy_to_user(new, nodes_addr(tmp_mask), size))
1059            return -EFAULT;
1060    }
1061    return sys_migrate_pages(pid, nr_bits + 1, old, new);
1062}
1063#endif
1064
1065struct compat_sysinfo {
1066    s32 uptime;
1067    u32 loads[3];
1068    u32 totalram;
1069    u32 freeram;
1070    u32 sharedram;
1071    u32 bufferram;
1072    u32 totalswap;
1073    u32 freeswap;
1074    u16 procs;
1075    u16 pad;
1076    u32 totalhigh;
1077    u32 freehigh;
1078    u32 mem_unit;
1079    char _f[20-2*sizeof(u32)-sizeof(int)];
1080};
1081
1082asmlinkage long
1083compat_sys_sysinfo(struct compat_sysinfo __user *info)
1084{
1085    struct sysinfo s;
1086
1087    do_sysinfo(&s);
1088
1089    /* Check to see if any memory value is too large for 32-bit and scale
1090     * down if needed
1091     */
1092    if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1093        int bitcount = 0;
1094
1095        while (s.mem_unit < PAGE_SIZE) {
1096            s.mem_unit <<= 1;
1097            bitcount++;
1098        }
1099
1100        s.totalram >>= bitcount;
1101        s.freeram >>= bitcount;
1102        s.sharedram >>= bitcount;
1103        s.bufferram >>= bitcount;
1104        s.totalswap >>= bitcount;
1105        s.freeswap >>= bitcount;
1106        s.totalhigh >>= bitcount;
1107        s.freehigh >>= bitcount;
1108    }
1109
1110    if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1111        __put_user (s.uptime, &info->uptime) ||
1112        __put_user (s.loads[0], &info->loads[0]) ||
1113        __put_user (s.loads[1], &info->loads[1]) ||
1114        __put_user (s.loads[2], &info->loads[2]) ||
1115        __put_user (s.totalram, &info->totalram) ||
1116        __put_user (s.freeram, &info->freeram) ||
1117        __put_user (s.sharedram, &info->sharedram) ||
1118        __put_user (s.bufferram, &info->bufferram) ||
1119        __put_user (s.totalswap, &info->totalswap) ||
1120        __put_user (s.freeswap, &info->freeswap) ||
1121        __put_user (s.procs, &info->procs) ||
1122        __put_user (s.totalhigh, &info->totalhigh) ||
1123        __put_user (s.freehigh, &info->freehigh) ||
1124        __put_user (s.mem_unit, &info->mem_unit))
1125        return -EFAULT;
1126
1127    return 0;
1128}
1129
1130/*
1131 * Allocate user-space memory for the duration of a single system call,
1132 * in order to marshall parameters inside a compat thunk.
1133 */
1134void __user *compat_alloc_user_space(unsigned long len)
1135{
1136    void __user *ptr;
1137
1138    /* If len would occupy more than half of the entire compat space... */
1139    if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1140        return NULL;
1141
1142    ptr = arch_compat_alloc_user_space(len);
1143
1144    if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1145        return NULL;
1146
1147    return ptr;
1148}
1149EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1150

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