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

Archive Download this file



interactive