2 * linux/kernel/compat.c
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
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.
14 #include <linux/linkage.h>
15 #include <linux/compat.h>
16 #include <linux/errno.h>
17 #include <linux/time.h>
18 #include <linux/signal.h>
19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20 #include <linux/syscalls.h>
21 #include <linux/unistd.h>
22 #include <linux/security.h>
23 #include <linux/timex.h>
24 #include <linux/export.h>
25 #include <linux/migrate.h>
26 #include <linux/posix-timers.h>
27 #include <linux/times.h>
28 #include <linux/ptrace.h>
29 #include <linux/gfp.h>
31 #include <asm/uaccess.h>
34 * Get/set struct timeval with struct timespec on the native side
36 static int compat_get_timeval_convert(struct timespec *o,
37 struct compat_timeval __user *i)
41 if (get_user(o->tv_sec, &i->tv_sec) ||
42 get_user(usec, &i->tv_usec))
44 o->tv_nsec = usec * 1000;
48 static int compat_put_timeval_convert(struct compat_timeval __user *o,
51 return (put_user(i->tv_sec, &o->tv_sec) ||
52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
55 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
57 memset(txc, 0, sizeof(struct timex));
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))
85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
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))
113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
114 struct timezone __user *tz)
118 do_gettimeofday(&ktv);
119 if (compat_put_timeval_convert(tv, &ktv))
123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
131 struct timezone __user *tz)
137 if (compat_get_timeval_convert(&kts, tv))
141 if (copy_from_user(&ktz, tz, sizeof(ktz)))
145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
148 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
150 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
151 __get_user(tv->tv_sec, &ctv->tv_sec) ||
152 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
154 EXPORT_SYMBOL_GPL(get_compat_timeval);
156 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
158 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
159 __put_user(tv->tv_sec, &ctv->tv_sec) ||
160 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
162 EXPORT_SYMBOL_GPL(put_compat_timeval);
164 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
166 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
167 __get_user(ts->tv_sec, &cts->tv_sec) ||
168 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
170 EXPORT_SYMBOL_GPL(get_compat_timespec);
172 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
174 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
175 __put_user(ts->tv_sec, &cts->tv_sec) ||
176 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
178 EXPORT_SYMBOL_GPL(put_compat_timespec);
180 int compat_get_timeval(struct timeval *tv, const void __user *utv)
182 if (COMPAT_USE_64BIT_TIME)
183 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
185 return get_compat_timeval(tv, utv);
187 EXPORT_SYMBOL_GPL(compat_get_timeval);
189 int compat_put_timeval(const struct timeval *tv, void __user *utv)
191 if (COMPAT_USE_64BIT_TIME)
192 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
194 return put_compat_timeval(tv, utv);
196 EXPORT_SYMBOL_GPL(compat_put_timeval);
198 int compat_get_timespec(struct timespec *ts, const void __user *uts)
200 if (COMPAT_USE_64BIT_TIME)
201 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
203 return get_compat_timespec(ts, uts);
205 EXPORT_SYMBOL_GPL(compat_get_timespec);
207 int compat_put_timespec(const struct timespec *ts, void __user *uts)
209 if (COMPAT_USE_64BIT_TIME)
210 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
212 return put_compat_timespec(ts, uts);
214 EXPORT_SYMBOL_GPL(compat_put_timespec);
216 static long compat_nanosleep_restart(struct restart_block *restart)
218 struct compat_timespec __user *rmtp;
223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
226 ret = hrtimer_nanosleep_restart(restart);
230 rmtp = restart->nanosleep.compat_rmtp;
232 if (rmtp && put_compat_timespec(&rmt, rmtp))
239 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
240 struct compat_timespec __user *rmtp)
242 struct timespec tu, rmt;
246 if (get_compat_timespec(&tu, rqtp))
249 if (!timespec_valid(&tu))
254 ret = hrtimer_nanosleep(&tu,
255 rmtp ? (struct timespec __user *)&rmt : NULL,
256 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
260 struct restart_block *restart
261 = ¤t_thread_info()->restart_block;
263 restart->fn = compat_nanosleep_restart;
264 restart->nanosleep.compat_rmtp = rmtp;
266 if (rmtp && put_compat_timespec(&rmt, rmtp))
273 static inline long get_compat_itimerval(struct itimerval *o,
274 struct compat_itimerval __user *i)
276 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
277 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
278 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
279 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
280 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
283 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
286 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
287 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
288 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
289 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
290 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
293 asmlinkage long compat_sys_getitimer(int which,
294 struct compat_itimerval __user *it)
296 struct itimerval kit;
299 error = do_getitimer(which, &kit);
300 if (!error && put_compat_itimerval(it, &kit))
305 asmlinkage long compat_sys_setitimer(int which,
306 struct compat_itimerval __user *in,
307 struct compat_itimerval __user *out)
309 struct itimerval kin, kout;
313 if (get_compat_itimerval(&kin, in))
316 memset(&kin, 0, sizeof(kin));
318 error = do_setitimer(which, &kin, out ? &kout : NULL);
321 if (put_compat_itimerval(out, &kout))
326 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
328 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
331 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
335 struct compat_tms tmp;
338 /* Convert our struct tms to the compat version. */
339 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
340 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
341 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
342 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
343 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
346 force_successful_syscall_return();
347 return compat_jiffies_to_clock_t(jiffies);
350 #ifdef __ARCH_WANT_SYS_SIGPENDING
353 * Assumption: old_sigset_t and compat_old_sigset_t are both
354 * types that can be passed to put_user()/get_user().
357 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
361 mm_segment_t old_fs = get_fs();
364 ret = sys_sigpending((old_sigset_t __user *) &s);
367 ret = put_user(s, set);
373 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
375 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
376 compat_old_sigset_t __user *oset)
382 if (set && get_user(s, set))
386 ret = sys_sigprocmask(how,
387 set ? (old_sigset_t __user *) &s : NULL,
388 oset ? (old_sigset_t __user *) &s : NULL);
392 ret = put_user(s, oset);
398 asmlinkage long compat_sys_setrlimit(unsigned int resource,
399 struct compat_rlimit __user *rlim)
403 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
404 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
405 __get_user(r.rlim_max, &rlim->rlim_max))
408 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
409 r.rlim_cur = RLIM_INFINITY;
410 if (r.rlim_max == COMPAT_RLIM_INFINITY)
411 r.rlim_max = RLIM_INFINITY;
412 return do_prlimit(current, resource, &r, NULL);
415 #ifdef COMPAT_RLIM_OLD_INFINITY
417 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
418 struct compat_rlimit __user *rlim)
422 mm_segment_t old_fs = get_fs();
425 ret = sys_old_getrlimit(resource, &r);
429 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
430 r.rlim_cur = COMPAT_RLIM_INFINITY;
431 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
432 r.rlim_max = COMPAT_RLIM_INFINITY;
434 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
435 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
436 __put_user(r.rlim_max, &rlim->rlim_max))
444 asmlinkage long compat_sys_getrlimit(unsigned int resource,
445 struct compat_rlimit __user *rlim)
450 ret = do_prlimit(current, resource, NULL, &r);
452 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
453 r.rlim_cur = COMPAT_RLIM_INFINITY;
454 if (r.rlim_max > COMPAT_RLIM_INFINITY)
455 r.rlim_max = COMPAT_RLIM_INFINITY;
457 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
458 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
459 __put_user(r.rlim_max, &rlim->rlim_max))
465 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
467 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
468 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
469 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
470 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
471 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
472 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
473 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
474 __put_user(r->ru_idrss, &ru->ru_idrss) ||
475 __put_user(r->ru_isrss, &ru->ru_isrss) ||
476 __put_user(r->ru_minflt, &ru->ru_minflt) ||
477 __put_user(r->ru_majflt, &ru->ru_majflt) ||
478 __put_user(r->ru_nswap, &ru->ru_nswap) ||
479 __put_user(r->ru_inblock, &ru->ru_inblock) ||
480 __put_user(r->ru_oublock, &ru->ru_oublock) ||
481 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
482 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
483 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
484 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
485 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
490 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
494 mm_segment_t old_fs = get_fs();
497 ret = sys_getrusage(who, (struct rusage __user *) &r);
503 if (put_compat_rusage(&r, ru))
510 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
511 struct compat_rusage __user *ru)
514 return sys_wait4(pid, stat_addr, options, NULL);
519 mm_segment_t old_fs = get_fs();
524 (unsigned int __user *) &status : NULL),
525 options, (struct rusage __user *) &r);
529 if (put_compat_rusage(&r, ru))
531 if (stat_addr && put_user(status, stat_addr))
538 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
539 struct compat_siginfo __user *uinfo, int options,
540 struct compat_rusage __user *uru)
545 mm_segment_t old_fs = get_fs();
547 memset(&info, 0, sizeof(info));
550 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
551 uru ? (struct rusage __user *)&ru : NULL);
554 if ((ret < 0) || (info.si_signo == 0))
558 ret = put_compat_rusage(&ru, uru);
563 BUG_ON(info.si_code & __SI_MASK);
564 info.si_code |= __SI_CHLD;
565 return copy_siginfo_to_user32(uinfo, &info);
568 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
569 unsigned len, struct cpumask *new_mask)
573 if (len < cpumask_size())
574 memset(new_mask, 0, cpumask_size());
575 else if (len > cpumask_size())
576 len = cpumask_size();
578 k = cpumask_bits(new_mask);
579 return compat_get_bitmap(k, user_mask_ptr, len * 8);
582 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
584 compat_ulong_t __user *user_mask_ptr)
586 cpumask_var_t new_mask;
589 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
592 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
596 retval = sched_setaffinity(pid, new_mask);
598 free_cpumask_var(new_mask);
602 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
603 compat_ulong_t __user *user_mask_ptr)
608 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
610 if (len & (sizeof(compat_ulong_t)-1))
613 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
616 ret = sched_getaffinity(pid, mask);
618 size_t retlen = min_t(size_t, len, cpumask_size());
620 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
625 free_cpumask_var(mask);
630 int get_compat_itimerspec(struct itimerspec *dst,
631 const struct compat_itimerspec __user *src)
633 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
634 get_compat_timespec(&dst->it_value, &src->it_value))
639 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
640 const struct itimerspec *src)
642 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
643 put_compat_timespec(&src->it_value, &dst->it_value))
648 long compat_sys_timer_create(clockid_t which_clock,
649 struct compat_sigevent __user *timer_event_spec,
650 timer_t __user *created_timer_id)
652 struct sigevent __user *event = NULL;
654 if (timer_event_spec) {
655 struct sigevent kevent;
657 event = compat_alloc_user_space(sizeof(*event));
658 if (get_compat_sigevent(&kevent, timer_event_spec) ||
659 copy_to_user(event, &kevent, sizeof(*event)))
663 return sys_timer_create(which_clock, event, created_timer_id);
666 long compat_sys_timer_settime(timer_t timer_id, int flags,
667 struct compat_itimerspec __user *new,
668 struct compat_itimerspec __user *old)
672 struct itimerspec newts, oldts;
676 if (get_compat_itimerspec(&newts, new))
680 err = sys_timer_settime(timer_id, flags,
681 (struct itimerspec __user *) &newts,
682 (struct itimerspec __user *) &oldts);
684 if (!err && old && put_compat_itimerspec(old, &oldts))
689 long compat_sys_timer_gettime(timer_t timer_id,
690 struct compat_itimerspec __user *setting)
694 struct itimerspec ts;
698 err = sys_timer_gettime(timer_id,
699 (struct itimerspec __user *) &ts);
701 if (!err && put_compat_itimerspec(setting, &ts))
706 long compat_sys_clock_settime(clockid_t which_clock,
707 struct compat_timespec __user *tp)
713 if (get_compat_timespec(&ts, tp))
717 err = sys_clock_settime(which_clock,
718 (struct timespec __user *) &ts);
723 long compat_sys_clock_gettime(clockid_t which_clock,
724 struct compat_timespec __user *tp)
732 err = sys_clock_gettime(which_clock,
733 (struct timespec __user *) &ts);
735 if (!err && put_compat_timespec(&ts, tp))
740 long compat_sys_clock_adjtime(clockid_t which_clock,
741 struct compat_timex __user *utp)
747 err = compat_get_timex(&txc, utp);
753 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
756 err = compat_put_timex(utp, &txc);
763 long compat_sys_clock_getres(clockid_t which_clock,
764 struct compat_timespec __user *tp)
772 err = sys_clock_getres(which_clock,
773 (struct timespec __user *) &ts);
775 if (!err && tp && put_compat_timespec(&ts, tp))
780 static long compat_clock_nanosleep_restart(struct restart_block *restart)
785 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
787 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
790 err = clock_nanosleep_restart(restart);
793 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
794 put_compat_timespec(&tu, rmtp))
797 if (err == -ERESTART_RESTARTBLOCK) {
798 restart->fn = compat_clock_nanosleep_restart;
799 restart->nanosleep.compat_rmtp = rmtp;
804 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
805 struct compat_timespec __user *rqtp,
806 struct compat_timespec __user *rmtp)
810 struct timespec in, out;
811 struct restart_block *restart;
813 if (get_compat_timespec(&in, rqtp))
818 err = sys_clock_nanosleep(which_clock, flags,
819 (struct timespec __user *) &in,
820 (struct timespec __user *) &out);
823 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
824 put_compat_timespec(&out, rmtp))
827 if (err == -ERESTART_RESTARTBLOCK) {
828 restart = ¤t_thread_info()->restart_block;
829 restart->fn = compat_clock_nanosleep_restart;
830 restart->nanosleep.compat_rmtp = rmtp;
836 * We currently only need the following fields from the sigevent
837 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
838 * sigev_notify_thread_id). The others are handled in user mode.
839 * We also assume that copying sigev_value.sival_int is sufficient
840 * to keep all the bits of sigev_value.sival_ptr intact.
842 int get_compat_sigevent(struct sigevent *event,
843 const struct compat_sigevent __user *u_event)
845 memset(event, 0, sizeof(*event));
846 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
847 __get_user(event->sigev_value.sival_int,
848 &u_event->sigev_value.sival_int) ||
849 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
850 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
851 __get_user(event->sigev_notify_thread_id,
852 &u_event->sigev_notify_thread_id))
856 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
857 unsigned long bitmap_size)
862 unsigned long nr_compat_longs;
864 /* align bitmap up to nearest compat_long_t boundary */
865 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
867 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
870 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
872 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
875 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
877 * We dont want to read past the end of the userspace
878 * bitmap. We must however ensure the end of the
879 * kernel bitmap is zeroed.
881 if (nr_compat_longs-- > 0) {
882 if (__get_user(um, umask))
889 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
897 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
898 unsigned long bitmap_size)
903 unsigned long nr_compat_longs;
905 /* align bitmap up to nearest compat_long_t boundary */
906 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
908 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
911 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
913 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
916 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
920 * We dont want to write past the end of the userspace
923 if (nr_compat_longs-- > 0) {
924 if (__put_user(um, umask))
938 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
940 switch (_NSIG_WORDS) {
941 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
942 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
943 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
944 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
947 EXPORT_SYMBOL_GPL(sigset_from_compat);
950 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
951 struct compat_siginfo __user *uinfo,
952 struct compat_timespec __user *uts, compat_size_t sigsetsize)
960 if (sigsetsize != sizeof(sigset_t))
963 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
965 sigset_from_compat(&s, &s32);
968 if (get_compat_timespec(&t, uts))
972 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
974 if (ret > 0 && uinfo) {
975 if (copy_siginfo_to_user32(uinfo, &info))
984 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
985 struct compat_siginfo __user *uinfo)
989 if (copy_siginfo_from_user32(&info, uinfo))
991 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
994 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
996 /* compat_time_t is a 32 bit "long" and needs to get converted. */
998 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1003 do_gettimeofday(&tv);
1007 if (put_user(i,tloc))
1010 force_successful_syscall_return();
1014 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1019 if (get_user(tv.tv_sec, tptr))
1024 err = security_settime(&tv, NULL);
1028 do_settimeofday(&tv);
1032 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1034 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1035 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1038 compat_sigset_t newset32;
1040 /* XXX: Don't preclude handling different sized sigset_t's. */
1041 if (sigsetsize != sizeof(sigset_t))
1044 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1046 sigset_from_compat(&newset, &newset32);
1047 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1049 current->saved_sigmask = current->blocked;
1050 set_current_blocked(&newset);
1052 current->state = TASK_INTERRUPTIBLE;
1054 set_restore_sigmask();
1055 return -ERESTARTNOHAND;
1057 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1059 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1064 err = compat_get_timex(&txc, utp);
1068 ret = do_adjtimex(&txc);
1070 err = compat_put_timex(utp, &txc);
1078 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1079 compat_uptr_t __user *pages32,
1080 const int __user *nodes,
1084 const void __user * __user *pages;
1087 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1088 for (i = 0; i < nr_pages; i++) {
1091 if (get_user(p, pages32 + i) ||
1092 put_user(compat_ptr(p), pages + i))
1095 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1098 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1099 compat_ulong_t maxnode,
1100 const compat_ulong_t __user *old_nodes,
1101 const compat_ulong_t __user *new_nodes)
1103 unsigned long __user *old = NULL;
1104 unsigned long __user *new = NULL;
1105 nodemask_t tmp_mask;
1106 unsigned long nr_bits;
1109 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1110 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1112 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1114 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1116 new = old + size / sizeof(unsigned long);
1117 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1121 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1124 new = compat_alloc_user_space(size);
1125 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1128 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1132 struct compat_sysinfo {
1146 char _f[20-2*sizeof(u32)-sizeof(int)];
1150 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1156 /* Check to see if any memory value is too large for 32-bit and scale
1159 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1162 while (s.mem_unit < PAGE_SIZE) {
1167 s.totalram >>= bitcount;
1168 s.freeram >>= bitcount;
1169 s.sharedram >>= bitcount;
1170 s.bufferram >>= bitcount;
1171 s.totalswap >>= bitcount;
1172 s.freeswap >>= bitcount;
1173 s.totalhigh >>= bitcount;
1174 s.freehigh >>= bitcount;
1177 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1178 __put_user (s.uptime, &info->uptime) ||
1179 __put_user (s.loads[0], &info->loads[0]) ||
1180 __put_user (s.loads[1], &info->loads[1]) ||
1181 __put_user (s.loads[2], &info->loads[2]) ||
1182 __put_user (s.totalram, &info->totalram) ||
1183 __put_user (s.freeram, &info->freeram) ||
1184 __put_user (s.sharedram, &info->sharedram) ||
1185 __put_user (s.bufferram, &info->bufferram) ||
1186 __put_user (s.totalswap, &info->totalswap) ||
1187 __put_user (s.freeswap, &info->freeswap) ||
1188 __put_user (s.procs, &info->procs) ||
1189 __put_user (s.totalhigh, &info->totalhigh) ||
1190 __put_user (s.freehigh, &info->freehigh) ||
1191 __put_user (s.mem_unit, &info->mem_unit))
1198 * Allocate user-space memory for the duration of a single system call,
1199 * in order to marshall parameters inside a compat thunk.
1201 void __user *compat_alloc_user_space(unsigned long len)
1205 /* If len would occupy more than half of the entire compat space... */
1206 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1209 ptr = arch_compat_alloc_user_space(len);
1211 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1216 EXPORT_SYMBOL_GPL(compat_alloc_user_space);