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
29#include <asm/uaccess.h>
30
31/*
32 * Note that the native side is already converted to a timespec, because
33 * that's what we want anyway.
34 */
35static int compat_get_timeval(struct timespec *o,
36        struct compat_timeval __user *i)
37{
38    long usec;
39
40    if (get_user(o->tv_sec, &i->tv_sec) ||
41        get_user(usec, &i->tv_usec))
42        return -EFAULT;
43    o->tv_nsec = usec * 1000;
44    return 0;
45}
46
47static int compat_put_timeval(struct compat_timeval __user *o,
48        struct timeval *i)
49{
50    return (put_user(i->tv_sec, &o->tv_sec) ||
51        put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
52}
53
54asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
55        struct timezone __user *tz)
56{
57    if (tv) {
58        struct timeval ktv;
59        do_gettimeofday(&ktv);
60        if (compat_put_timeval(tv, &ktv))
61            return -EFAULT;
62    }
63    if (tz) {
64        if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
65            return -EFAULT;
66    }
67
68    return 0;
69}
70
71asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
72        struct timezone __user *tz)
73{
74    struct timespec kts;
75    struct timezone ktz;
76
77    if (tv) {
78        if (compat_get_timeval(&kts, tv))
79            return -EFAULT;
80    }
81    if (tz) {
82        if (copy_from_user(&ktz, tz, sizeof(ktz)))
83            return -EFAULT;
84    }
85
86    return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
87}
88
89int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
90{
91    return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
92            __get_user(ts->tv_sec, &cts->tv_sec) ||
93            __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
94}
95
96int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
97{
98    return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
99            __put_user(ts->tv_sec, &cts->tv_sec) ||
100            __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
101}
102
103static long compat_nanosleep_restart(struct restart_block *restart)
104{
105    struct compat_timespec __user *rmtp;
106    struct timespec rmt;
107    mm_segment_t oldfs;
108    long ret;
109
110    restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
111    oldfs = get_fs();
112    set_fs(KERNEL_DS);
113    ret = hrtimer_nanosleep_restart(restart);
114    set_fs(oldfs);
115
116    if (ret) {
117        rmtp = restart->nanosleep.compat_rmtp;
118
119        if (rmtp && put_compat_timespec(&rmt, rmtp))
120            return -EFAULT;
121    }
122
123    return ret;
124}
125
126asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
127                     struct compat_timespec __user *rmtp)
128{
129    struct timespec tu, rmt;
130    mm_segment_t oldfs;
131    long ret;
132
133    if (get_compat_timespec(&tu, rqtp))
134        return -EFAULT;
135
136    if (!timespec_valid(&tu))
137        return -EINVAL;
138
139    oldfs = get_fs();
140    set_fs(KERNEL_DS);
141    ret = hrtimer_nanosleep(&tu,
142                rmtp ? (struct timespec __user *)&rmt : NULL,
143                HRTIMER_MODE_REL, CLOCK_MONOTONIC);
144    set_fs(oldfs);
145
146    if (ret) {
147        struct restart_block *restart
148            = &current_thread_info()->restart_block;
149
150        restart->fn = compat_nanosleep_restart;
151        restart->nanosleep.compat_rmtp = rmtp;
152
153        if (rmtp && put_compat_timespec(&rmt, rmtp))
154            return -EFAULT;
155    }
156
157    return ret;
158}
159
160static inline long get_compat_itimerval(struct itimerval *o,
161        struct compat_itimerval __user *i)
162{
163    return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
164        (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
165         __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
166         __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
167         __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
168}
169
170static inline long put_compat_itimerval(struct compat_itimerval __user *o,
171        struct itimerval *i)
172{
173    return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
174        (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
175         __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
176         __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
177         __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
178}
179
180asmlinkage long compat_sys_getitimer(int which,
181        struct compat_itimerval __user *it)
182{
183    struct itimerval kit;
184    int error;
185
186    error = do_getitimer(which, &kit);
187    if (!error && put_compat_itimerval(it, &kit))
188        error = -EFAULT;
189    return error;
190}
191
192asmlinkage long compat_sys_setitimer(int which,
193        struct compat_itimerval __user *in,
194        struct compat_itimerval __user *out)
195{
196    struct itimerval kin, kout;
197    int error;
198
199    if (in) {
200        if (get_compat_itimerval(&kin, in))
201            return -EFAULT;
202    } else
203        memset(&kin, 0, sizeof(kin));
204
205    error = do_setitimer(which, &kin, out ? &kout : NULL);
206    if (error || !out)
207        return error;
208    if (put_compat_itimerval(out, &kout))
209        return -EFAULT;
210    return 0;
211}
212
213static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
214{
215    return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
216}
217
218asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
219{
220    if (tbuf) {
221        struct tms tms;
222        struct compat_tms tmp;
223
224        do_sys_times(&tms);
225        /* Convert our struct tms to the compat version. */
226        tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
227        tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
228        tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
229        tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
230        if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
231            return -EFAULT;
232    }
233    force_successful_syscall_return();
234    return compat_jiffies_to_clock_t(jiffies);
235}
236
237/*
238 * Assumption: old_sigset_t and compat_old_sigset_t are both
239 * types that can be passed to put_user()/get_user().
240 */
241
242asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
243{
244    old_sigset_t s;
245    long ret;
246    mm_segment_t old_fs = get_fs();
247
248    set_fs(KERNEL_DS);
249    ret = sys_sigpending((old_sigset_t __user *) &s);
250    set_fs(old_fs);
251    if (ret == 0)
252        ret = put_user(s, set);
253    return ret;
254}
255
256asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
257        compat_old_sigset_t __user *oset)
258{
259    old_sigset_t s;
260    long ret;
261    mm_segment_t old_fs;
262
263    if (set && get_user(s, set))
264        return -EFAULT;
265    old_fs = get_fs();
266    set_fs(KERNEL_DS);
267    ret = sys_sigprocmask(how,
268                  set ? (old_sigset_t __user *) &s : NULL,
269                  oset ? (old_sigset_t __user *) &s : NULL);
270    set_fs(old_fs);
271    if (ret == 0)
272        if (oset)
273            ret = put_user(s, oset);
274    return ret;
275}
276
277asmlinkage long compat_sys_setrlimit(unsigned int resource,
278        struct compat_rlimit __user *rlim)
279{
280    struct rlimit r;
281    int ret;
282    mm_segment_t old_fs = get_fs ();
283
284    if (resource >= RLIM_NLIMITS)
285        return -EINVAL;
286
287    if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
288        __get_user(r.rlim_cur, &rlim->rlim_cur) ||
289        __get_user(r.rlim_max, &rlim->rlim_max))
290        return -EFAULT;
291
292    if (r.rlim_cur == COMPAT_RLIM_INFINITY)
293        r.rlim_cur = RLIM_INFINITY;
294    if (r.rlim_max == COMPAT_RLIM_INFINITY)
295        r.rlim_max = RLIM_INFINITY;
296    set_fs(KERNEL_DS);
297    ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
298    set_fs(old_fs);
299    return ret;
300}
301
302#ifdef COMPAT_RLIM_OLD_INFINITY
303
304asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
305        struct compat_rlimit __user *rlim)
306{
307    struct rlimit r;
308    int ret;
309    mm_segment_t old_fs = get_fs();
310
311    set_fs(KERNEL_DS);
312    ret = sys_old_getrlimit(resource, &r);
313    set_fs(old_fs);
314
315    if (!ret) {
316        if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
317            r.rlim_cur = COMPAT_RLIM_INFINITY;
318        if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
319            r.rlim_max = COMPAT_RLIM_INFINITY;
320
321        if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
322            __put_user(r.rlim_cur, &rlim->rlim_cur) ||
323            __put_user(r.rlim_max, &rlim->rlim_max))
324            return -EFAULT;
325    }
326    return ret;
327}
328
329#endif
330
331asmlinkage long compat_sys_getrlimit (unsigned int resource,
332        struct compat_rlimit __user *rlim)
333{
334    struct rlimit r;
335    int ret;
336    mm_segment_t old_fs = get_fs();
337
338    set_fs(KERNEL_DS);
339    ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
340    set_fs(old_fs);
341    if (!ret) {
342        if (r.rlim_cur > COMPAT_RLIM_INFINITY)
343            r.rlim_cur = COMPAT_RLIM_INFINITY;
344        if (r.rlim_max > COMPAT_RLIM_INFINITY)
345            r.rlim_max = COMPAT_RLIM_INFINITY;
346
347        if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
348            __put_user(r.rlim_cur, &rlim->rlim_cur) ||
349            __put_user(r.rlim_max, &rlim->rlim_max))
350            return -EFAULT;
351    }
352    return ret;
353}
354
355int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
356{
357    if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
358        __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
359        __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
360        __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
361        __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
362        __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
363        __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
364        __put_user(r->ru_idrss, &ru->ru_idrss) ||
365        __put_user(r->ru_isrss, &ru->ru_isrss) ||
366        __put_user(r->ru_minflt, &ru->ru_minflt) ||
367        __put_user(r->ru_majflt, &ru->ru_majflt) ||
368        __put_user(r->ru_nswap, &ru->ru_nswap) ||
369        __put_user(r->ru_inblock, &ru->ru_inblock) ||
370        __put_user(r->ru_oublock, &ru->ru_oublock) ||
371        __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
372        __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
373        __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
374        __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
375        __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
376        return -EFAULT;
377    return 0;
378}
379
380asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
381{
382    struct rusage r;
383    int ret;
384    mm_segment_t old_fs = get_fs();
385
386    set_fs(KERNEL_DS);
387    ret = sys_getrusage(who, (struct rusage __user *) &r);
388    set_fs(old_fs);
389
390    if (ret)
391        return ret;
392
393    if (put_compat_rusage(&r, ru))
394        return -EFAULT;
395
396    return 0;
397}
398
399asmlinkage long
400compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
401    struct compat_rusage __user *ru)
402{
403    if (!ru) {
404        return sys_wait4(pid, stat_addr, options, NULL);
405    } else {
406        struct rusage r;
407        int ret;
408        unsigned int status;
409        mm_segment_t old_fs = get_fs();
410
411        set_fs (KERNEL_DS);
412        ret = sys_wait4(pid,
413                (stat_addr ?
414                 (unsigned int __user *) &status : NULL),
415                options, (struct rusage __user *) &r);
416        set_fs (old_fs);
417
418        if (ret > 0) {
419            if (put_compat_rusage(&r, ru))
420                return -EFAULT;
421            if (stat_addr && put_user(status, stat_addr))
422                return -EFAULT;
423        }
424        return ret;
425    }
426}
427
428asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
429        struct compat_siginfo __user *uinfo, int options,
430        struct compat_rusage __user *uru)
431{
432    siginfo_t info;
433    struct rusage ru;
434    long ret;
435    mm_segment_t old_fs = get_fs();
436
437    memset(&info, 0, sizeof(info));
438
439    set_fs(KERNEL_DS);
440    ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
441             uru ? (struct rusage __user *)&ru : NULL);
442    set_fs(old_fs);
443
444    if ((ret < 0) || (info.si_signo == 0))
445        return ret;
446
447    if (uru) {
448        ret = put_compat_rusage(&ru, uru);
449        if (ret)
450            return ret;
451    }
452
453    BUG_ON(info.si_code & __SI_MASK);
454    info.si_code |= __SI_CHLD;
455    return copy_siginfo_to_user32(uinfo, &info);
456}
457
458static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
459                    unsigned len, struct cpumask *new_mask)
460{
461    unsigned long *k;
462
463    if (len < cpumask_size())
464        memset(new_mask, 0, cpumask_size());
465    else if (len > cpumask_size())
466        len = cpumask_size();
467
468    k = cpumask_bits(new_mask);
469    return compat_get_bitmap(k, user_mask_ptr, len * 8);
470}
471
472asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
473                         unsigned int len,
474                         compat_ulong_t __user *user_mask_ptr)
475{
476    cpumask_var_t new_mask;
477    int retval;
478
479    if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
480        return -ENOMEM;
481
482    retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
483    if (retval)
484        goto out;
485
486    retval = sched_setaffinity(pid, new_mask);
487out:
488    free_cpumask_var(new_mask);
489    return retval;
490}
491
492asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
493                         compat_ulong_t __user *user_mask_ptr)
494{
495    int ret;
496    cpumask_var_t mask;
497    unsigned long *k;
498    unsigned int min_length = cpumask_size();
499
500    if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
501        min_length = sizeof(compat_ulong_t);
502
503    if (len < min_length)
504        return -EINVAL;
505
506    if (!alloc_cpumask_var(&mask, GFP_KERNEL))
507        return -ENOMEM;
508
509    ret = sched_getaffinity(pid, mask);
510    if (ret < 0)
511        goto out;
512
513    k = cpumask_bits(mask);
514    ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
515    if (ret == 0)
516        ret = min_length;
517
518out:
519    free_cpumask_var(mask);
520    return ret;
521}
522
523int get_compat_itimerspec(struct itimerspec *dst,
524              const struct compat_itimerspec __user *src)
525{
526    if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
527        get_compat_timespec(&dst->it_value, &src->it_value))
528        return -EFAULT;
529    return 0;
530}
531
532int put_compat_itimerspec(struct compat_itimerspec __user *dst,
533              const struct itimerspec *src)
534{
535    if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
536        put_compat_timespec(&src->it_value, &dst->it_value))
537        return -EFAULT;
538    return 0;
539}
540
541long compat_sys_timer_create(clockid_t which_clock,
542            struct compat_sigevent __user *timer_event_spec,
543            timer_t __user *created_timer_id)
544{
545    struct sigevent __user *event = NULL;
546
547    if (timer_event_spec) {
548        struct sigevent kevent;
549
550        event = compat_alloc_user_space(sizeof(*event));
551        if (get_compat_sigevent(&kevent, timer_event_spec) ||
552            copy_to_user(event, &kevent, sizeof(*event)))
553            return -EFAULT;
554    }
555
556    return sys_timer_create(which_clock, event, created_timer_id);
557}
558
559long compat_sys_timer_settime(timer_t timer_id, int flags,
560              struct compat_itimerspec __user *new,
561              struct compat_itimerspec __user *old)
562{
563    long err;
564    mm_segment_t oldfs;
565    struct itimerspec newts, oldts;
566
567    if (!new)
568        return -EINVAL;
569    if (get_compat_itimerspec(&newts, new))
570        return -EFAULT;
571    oldfs = get_fs();
572    set_fs(KERNEL_DS);
573    err = sys_timer_settime(timer_id, flags,
574                (struct itimerspec __user *) &newts,
575                (struct itimerspec __user *) &oldts);
576    set_fs(oldfs);
577    if (!err && old && put_compat_itimerspec(old, &oldts))
578        return -EFAULT;
579    return err;
580}
581
582long compat_sys_timer_gettime(timer_t timer_id,
583        struct compat_itimerspec __user *setting)
584{
585    long err;
586    mm_segment_t oldfs;
587    struct itimerspec ts;
588
589    oldfs = get_fs();
590    set_fs(KERNEL_DS);
591    err = sys_timer_gettime(timer_id,
592                (struct itimerspec __user *) &ts);
593    set_fs(oldfs);
594    if (!err && put_compat_itimerspec(setting, &ts))
595        return -EFAULT;
596    return err;
597}
598
599long compat_sys_clock_settime(clockid_t which_clock,
600        struct compat_timespec __user *tp)
601{
602    long err;
603    mm_segment_t oldfs;
604    struct timespec ts;
605
606    if (get_compat_timespec(&ts, tp))
607        return -EFAULT;
608    oldfs = get_fs();
609    set_fs(KERNEL_DS);
610    err = sys_clock_settime(which_clock,
611                (struct timespec __user *) &ts);
612    set_fs(oldfs);
613    return err;
614}
615
616long compat_sys_clock_gettime(clockid_t which_clock,
617        struct compat_timespec __user *tp)
618{
619    long err;
620    mm_segment_t oldfs;
621    struct timespec ts;
622
623    oldfs = get_fs();
624    set_fs(KERNEL_DS);
625    err = sys_clock_gettime(which_clock,
626                (struct timespec __user *) &ts);
627    set_fs(oldfs);
628    if (!err && put_compat_timespec(&ts, tp))
629        return -EFAULT;
630    return err;
631}
632
633long compat_sys_clock_getres(clockid_t which_clock,
634        struct compat_timespec __user *tp)
635{
636    long err;
637    mm_segment_t oldfs;
638    struct timespec ts;
639
640    oldfs = get_fs();
641    set_fs(KERNEL_DS);
642    err = sys_clock_getres(which_clock,
643                   (struct timespec __user *) &ts);
644    set_fs(oldfs);
645    if (!err && tp && put_compat_timespec(&ts, tp))
646        return -EFAULT;
647    return err;
648}
649
650static long compat_clock_nanosleep_restart(struct restart_block *restart)
651{
652    long err;
653    mm_segment_t oldfs;
654    struct timespec tu;
655    struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
656
657    restart->nanosleep.rmtp = (struct timespec __user *) &tu;
658    oldfs = get_fs();
659    set_fs(KERNEL_DS);
660    err = clock_nanosleep_restart(restart);
661    set_fs(oldfs);
662
663    if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
664        put_compat_timespec(&tu, rmtp))
665        return -EFAULT;
666
667    if (err == -ERESTART_RESTARTBLOCK) {
668        restart->fn = compat_clock_nanosleep_restart;
669        restart->nanosleep.compat_rmtp = rmtp;
670    }
671    return err;
672}
673
674long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
675                struct compat_timespec __user *rqtp,
676                struct compat_timespec __user *rmtp)
677{
678    long err;
679    mm_segment_t oldfs;
680    struct timespec in, out;
681    struct restart_block *restart;
682
683    if (get_compat_timespec(&in, rqtp))
684        return -EFAULT;
685
686    oldfs = get_fs();
687    set_fs(KERNEL_DS);
688    err = sys_clock_nanosleep(which_clock, flags,
689                  (struct timespec __user *) &in,
690                  (struct timespec __user *) &out);
691    set_fs(oldfs);
692
693    if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
694        put_compat_timespec(&out, rmtp))
695        return -EFAULT;
696
697    if (err == -ERESTART_RESTARTBLOCK) {
698        restart = &current_thread_info()->restart_block;
699        restart->fn = compat_clock_nanosleep_restart;
700        restart->nanosleep.compat_rmtp = rmtp;
701    }
702    return err;
703}
704
705/*
706 * We currently only need the following fields from the sigevent
707 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
708 * sigev_notify_thread_id). The others are handled in user mode.
709 * We also assume that copying sigev_value.sival_int is sufficient
710 * to keep all the bits of sigev_value.sival_ptr intact.
711 */
712int get_compat_sigevent(struct sigevent *event,
713        const struct compat_sigevent __user *u_event)
714{
715    memset(event, 0, sizeof(*event));
716    return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
717        __get_user(event->sigev_value.sival_int,
718            &u_event->sigev_value.sival_int) ||
719        __get_user(event->sigev_signo, &u_event->sigev_signo) ||
720        __get_user(event->sigev_notify, &u_event->sigev_notify) ||
721        __get_user(event->sigev_notify_thread_id,
722            &u_event->sigev_notify_thread_id))
723        ? -EFAULT : 0;
724}
725
726long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
727               unsigned long bitmap_size)
728{
729    int i, j;
730    unsigned long m;
731    compat_ulong_t um;
732    unsigned long nr_compat_longs;
733
734    /* align bitmap up to nearest compat_long_t boundary */
735    bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
736
737    if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
738        return -EFAULT;
739
740    nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
741
742    for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
743        m = 0;
744
745        for (j = 0; j < sizeof(m)/sizeof(um); j++) {
746            /*
747             * We dont want to read past the end of the userspace
748             * bitmap. We must however ensure the end of the
749             * kernel bitmap is zeroed.
750             */
751            if (nr_compat_longs-- > 0) {
752                if (__get_user(um, umask))
753                    return -EFAULT;
754            } else {
755                um = 0;
756            }
757
758            umask++;
759            m |= (long)um << (j * BITS_PER_COMPAT_LONG);
760        }
761        *mask++ = m;
762    }
763
764    return 0;
765}
766
767long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
768               unsigned long bitmap_size)
769{
770    int i, j;
771    unsigned long m;
772    compat_ulong_t um;
773    unsigned long nr_compat_longs;
774
775    /* align bitmap up to nearest compat_long_t boundary */
776    bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
777
778    if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
779        return -EFAULT;
780
781    nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
782
783    for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
784        m = *mask++;
785
786        for (j = 0; j < sizeof(m)/sizeof(um); j++) {
787            um = m;
788
789            /*
790             * We dont want to write past the end of the userspace
791             * bitmap.
792             */
793            if (nr_compat_longs-- > 0) {
794                if (__put_user(um, umask))
795                    return -EFAULT;
796            }
797
798            umask++;
799            m >>= 4*sizeof(um);
800            m >>= 4*sizeof(um);
801        }
802    }
803
804    return 0;
805}
806
807void
808sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
809{
810    switch (_NSIG_WORDS) {
811    case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
812    case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
813    case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
814    case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
815    }
816}
817
818asmlinkage long
819compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
820        struct compat_siginfo __user *uinfo,
821        struct compat_timespec __user *uts, compat_size_t sigsetsize)
822{
823    compat_sigset_t s32;
824    sigset_t s;
825    int sig;
826    struct timespec t;
827    siginfo_t info;
828    long ret, timeout = 0;
829
830    if (sigsetsize != sizeof(sigset_t))
831        return -EINVAL;
832
833    if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
834        return -EFAULT;
835    sigset_from_compat(&s, &s32);
836    sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
837    signotset(&s);
838
839    if (uts) {
840        if (get_compat_timespec (&t, uts))
841            return -EFAULT;
842        if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
843                || t.tv_sec < 0)
844            return -EINVAL;
845    }
846
847    spin_lock_irq(&current->sighand->siglock);
848    sig = dequeue_signal(current, &s, &info);
849    if (!sig) {
850        timeout = MAX_SCHEDULE_TIMEOUT;
851        if (uts)
852            timeout = timespec_to_jiffies(&t)
853                +(t.tv_sec || t.tv_nsec);
854        if (timeout) {
855            current->real_blocked = current->blocked;
856            sigandsets(&current->blocked, &current->blocked, &s);
857
858            recalc_sigpending();
859            spin_unlock_irq(&current->sighand->siglock);
860
861            timeout = schedule_timeout_interruptible(timeout);
862
863            spin_lock_irq(&current->sighand->siglock);
864            sig = dequeue_signal(current, &s, &info);
865            current->blocked = current->real_blocked;
866            siginitset(&current->real_blocked, 0);
867            recalc_sigpending();
868        }
869    }
870    spin_unlock_irq(&current->sighand->siglock);
871
872    if (sig) {
873        ret = sig;
874        if (uinfo) {
875            if (copy_siginfo_to_user32(uinfo, &info))
876                ret = -EFAULT;
877        }
878    }else {
879        ret = timeout?-EINTR:-EAGAIN;
880    }
881    return ret;
882
883}
884
885asmlinkage long
886compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
887                 struct compat_siginfo __user *uinfo)
888{
889    siginfo_t info;
890
891    if (copy_siginfo_from_user32(&info, uinfo))
892        return -EFAULT;
893    return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
894}
895
896#ifdef __ARCH_WANT_COMPAT_SYS_TIME
897
898/* compat_time_t is a 32 bit "long" and needs to get converted. */
899
900asmlinkage long compat_sys_time(compat_time_t __user * tloc)
901{
902    compat_time_t i;
903    struct timeval tv;
904
905    do_gettimeofday(&tv);
906    i = tv.tv_sec;
907
908    if (tloc) {
909        if (put_user(i,tloc))
910            return -EFAULT;
911    }
912    force_successful_syscall_return();
913    return i;
914}
915
916asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
917{
918    struct timespec tv;
919    int err;
920
921    if (get_user(tv.tv_sec, tptr))
922        return -EFAULT;
923
924    tv.tv_nsec = 0;
925
926    err = security_settime(&tv, NULL);
927    if (err)
928        return err;
929
930    do_settimeofday(&tv);
931    return 0;
932}
933
934#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
935
936#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
937asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
938{
939    sigset_t newset;
940    compat_sigset_t newset32;
941
942    /* XXX: Don't preclude handling different sized sigset_t's. */
943    if (sigsetsize != sizeof(sigset_t))
944        return -EINVAL;
945
946    if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
947        return -EFAULT;
948    sigset_from_compat(&newset, &newset32);
949    sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
950
951    spin_lock_irq(&current->sighand->siglock);
952    current->saved_sigmask = current->blocked;
953    current->blocked = newset;
954    recalc_sigpending();
955    spin_unlock_irq(&current->sighand->siglock);
956
957    current->state = TASK_INTERRUPTIBLE;
958    schedule();
959    set_restore_sigmask();
960    return -ERESTARTNOHAND;
961}
962#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
963
964asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
965{
966    struct timex txc;
967    int ret;
968
969    memset(&txc, 0, sizeof(struct timex));
970
971    if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
972            __get_user(txc.modes, &utp->modes) ||
973            __get_user(txc.offset, &utp->offset) ||
974            __get_user(txc.freq, &utp->freq) ||
975            __get_user(txc.maxerror, &utp->maxerror) ||
976            __get_user(txc.esterror, &utp->esterror) ||
977            __get_user(txc.status, &utp->status) ||
978            __get_user(txc.constant, &utp->constant) ||
979            __get_user(txc.precision, &utp->precision) ||
980            __get_user(txc.tolerance, &utp->tolerance) ||
981            __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
982            __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
983            __get_user(txc.tick, &utp->tick) ||
984            __get_user(txc.ppsfreq, &utp->ppsfreq) ||
985            __get_user(txc.jitter, &utp->jitter) ||
986            __get_user(txc.shift, &utp->shift) ||
987            __get_user(txc.stabil, &utp->stabil) ||
988            __get_user(txc.jitcnt, &utp->jitcnt) ||
989            __get_user(txc.calcnt, &utp->calcnt) ||
990            __get_user(txc.errcnt, &utp->errcnt) ||
991            __get_user(txc.stbcnt, &utp->stbcnt))
992        return -EFAULT;
993
994    ret = do_adjtimex(&txc);
995
996    if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
997            __put_user(txc.modes, &utp->modes) ||
998            __put_user(txc.offset, &utp->offset) ||
999            __put_user(txc.freq, &utp->freq) ||
1000            __put_user(txc.maxerror, &utp->maxerror) ||
1001            __put_user(txc.esterror, &utp->esterror) ||
1002            __put_user(txc.status, &utp->status) ||
1003            __put_user(txc.constant, &utp->constant) ||
1004            __put_user(txc.precision, &utp->precision) ||
1005            __put_user(txc.tolerance, &utp->tolerance) ||
1006            __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1007            __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1008            __put_user(txc.tick, &utp->tick) ||
1009            __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1010            __put_user(txc.jitter, &utp->jitter) ||
1011            __put_user(txc.shift, &utp->shift) ||
1012            __put_user(txc.stabil, &utp->stabil) ||
1013            __put_user(txc.jitcnt, &utp->jitcnt) ||
1014            __put_user(txc.calcnt, &utp->calcnt) ||
1015            __put_user(txc.errcnt, &utp->errcnt) ||
1016            __put_user(txc.stbcnt, &utp->stbcnt) ||
1017            __put_user(txc.tai, &utp->tai))
1018        ret = -EFAULT;
1019
1020    return ret;
1021}
1022
1023#ifdef CONFIG_NUMA
1024asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1025        compat_uptr_t __user *pages32,
1026        const int __user *nodes,
1027        int __user *status,
1028        int flags)
1029{
1030    const void __user * __user *pages;
1031    int i;
1032
1033    pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034    for (i = 0; i < nr_pages; i++) {
1035        compat_uptr_t p;
1036
1037        if (get_user(p, pages32 + i) ||
1038            put_user(compat_ptr(p), pages + i))
1039            return -EFAULT;
1040    }
1041    return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042}
1043
1044asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045            compat_ulong_t maxnode,
1046            const compat_ulong_t __user *old_nodes,
1047            const compat_ulong_t __user *new_nodes)
1048{
1049    unsigned long __user *old = NULL;
1050    unsigned long __user *new = NULL;
1051    nodemask_t tmp_mask;
1052    unsigned long nr_bits;
1053    unsigned long size;
1054
1055    nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056    size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057    if (old_nodes) {
1058        if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059            return -EFAULT;
1060        old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061        if (new_nodes)
1062            new = old + size / sizeof(unsigned long);
1063        if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064            return -EFAULT;
1065    }
1066    if (new_nodes) {
1067        if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068            return -EFAULT;
1069        if (new == NULL)
1070            new = compat_alloc_user_space(size);
1071        if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072            return -EFAULT;
1073    }
1074    return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075}
1076#endif
1077
1078struct compat_sysinfo {
1079    s32 uptime;
1080    u32 loads[3];
1081    u32 totalram;
1082    u32 freeram;
1083    u32 sharedram;
1084    u32 bufferram;
1085    u32 totalswap;
1086    u32 freeswap;
1087    u16 procs;
1088    u16 pad;
1089    u32 totalhigh;
1090    u32 freehigh;
1091    u32 mem_unit;
1092    char _f[20-2*sizeof(u32)-sizeof(int)];
1093};
1094
1095asmlinkage long
1096compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097{
1098    struct sysinfo s;
1099
1100    do_sysinfo(&s);
1101
1102    /* Check to see if any memory value is too large for 32-bit and scale
1103     * down if needed
1104     */
1105    if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106        int bitcount = 0;
1107
1108        while (s.mem_unit < PAGE_SIZE) {
1109            s.mem_unit <<= 1;
1110            bitcount++;
1111        }
1112
1113        s.totalram >>= bitcount;
1114        s.freeram >>= bitcount;
1115        s.sharedram >>= bitcount;
1116        s.bufferram >>= bitcount;
1117        s.totalswap >>= bitcount;
1118        s.freeswap >>= bitcount;
1119        s.totalhigh >>= bitcount;
1120        s.freehigh >>= bitcount;
1121    }
1122
1123    if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124        __put_user (s.uptime, &info->uptime) ||
1125        __put_user (s.loads[0], &info->loads[0]) ||
1126        __put_user (s.loads[1], &info->loads[1]) ||
1127        __put_user (s.loads[2], &info->loads[2]) ||
1128        __put_user (s.totalram, &info->totalram) ||
1129        __put_user (s.freeram, &info->freeram) ||
1130        __put_user (s.sharedram, &info->sharedram) ||
1131        __put_user (s.bufferram, &info->bufferram) ||
1132        __put_user (s.totalswap, &info->totalswap) ||
1133        __put_user (s.freeswap, &info->freeswap) ||
1134        __put_user (s.procs, &info->procs) ||
1135        __put_user (s.totalhigh, &info->totalhigh) ||
1136        __put_user (s.freehigh, &info->freehigh) ||
1137        __put_user (s.mem_unit, &info->mem_unit))
1138        return -EFAULT;
1139
1140    return 0;
1141}
1142

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