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/prctl.h>
30 #include <linux/gfp.h>
32 #include <asm/uaccess.h>
35 * Get/set struct timeval with struct timespec on the native side
37 static int compat_get_timeval_convert(struct timespec *o,
38 struct compat_timeval __user *i)
42 if (get_user(o->tv_sec, &i->tv_sec) ||
43 get_user(usec, &i->tv_usec))
45 o->tv_nsec = usec * 1000;
49 static int compat_put_timeval_convert(struct compat_timeval __user *o,
52 return (put_user(i->tv_sec, &o->tv_sec) ||
53 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
56 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
58 memset(txc, 0, sizeof(struct timex));
60 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
61 __get_user(txc->modes, &utp->modes) ||
62 __get_user(txc->offset, &utp->offset) ||
63 __get_user(txc->freq, &utp->freq) ||
64 __get_user(txc->maxerror, &utp->maxerror) ||
65 __get_user(txc->esterror, &utp->esterror) ||
66 __get_user(txc->status, &utp->status) ||
67 __get_user(txc->constant, &utp->constant) ||
68 __get_user(txc->precision, &utp->precision) ||
69 __get_user(txc->tolerance, &utp->tolerance) ||
70 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
71 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
72 __get_user(txc->tick, &utp->tick) ||
73 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
74 __get_user(txc->jitter, &utp->jitter) ||
75 __get_user(txc->shift, &utp->shift) ||
76 __get_user(txc->stabil, &utp->stabil) ||
77 __get_user(txc->jitcnt, &utp->jitcnt) ||
78 __get_user(txc->calcnt, &utp->calcnt) ||
79 __get_user(txc->errcnt, &utp->errcnt) ||
80 __get_user(txc->stbcnt, &utp->stbcnt))
86 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
88 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
89 __put_user(txc->modes, &utp->modes) ||
90 __put_user(txc->offset, &utp->offset) ||
91 __put_user(txc->freq, &utp->freq) ||
92 __put_user(txc->maxerror, &utp->maxerror) ||
93 __put_user(txc->esterror, &utp->esterror) ||
94 __put_user(txc->status, &utp->status) ||
95 __put_user(txc->constant, &utp->constant) ||
96 __put_user(txc->precision, &utp->precision) ||
97 __put_user(txc->tolerance, &utp->tolerance) ||
98 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
99 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
100 __put_user(txc->tick, &utp->tick) ||
101 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
102 __put_user(txc->jitter, &utp->jitter) ||
103 __put_user(txc->shift, &utp->shift) ||
104 __put_user(txc->stabil, &utp->stabil) ||
105 __put_user(txc->jitcnt, &utp->jitcnt) ||
106 __put_user(txc->calcnt, &utp->calcnt) ||
107 __put_user(txc->errcnt, &utp->errcnt) ||
108 __put_user(txc->stbcnt, &utp->stbcnt) ||
109 __put_user(txc->tai, &utp->tai))
114 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
115 struct timezone __user *tz)
119 do_gettimeofday(&ktv);
120 if (compat_put_timeval_convert(tv, &ktv))
124 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
131 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
132 struct timezone __user *tz)
138 if (compat_get_timeval_convert(&kts, tv))
142 if (copy_from_user(&ktz, tz, sizeof(ktz)))
146 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
149 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
151 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
152 __get_user(tv->tv_sec, &ctv->tv_sec) ||
153 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
155 EXPORT_SYMBOL_GPL(get_compat_timeval);
157 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
159 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
160 __put_user(tv->tv_sec, &ctv->tv_sec) ||
161 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
163 EXPORT_SYMBOL_GPL(put_compat_timeval);
165 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
167 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
168 __get_user(ts->tv_sec, &cts->tv_sec) ||
169 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
171 EXPORT_SYMBOL_GPL(get_compat_timespec);
173 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
175 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
176 __put_user(ts->tv_sec, &cts->tv_sec) ||
177 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
179 EXPORT_SYMBOL_GPL(put_compat_timespec);
181 int compat_get_timeval(struct timeval *tv, const void __user *utv)
183 if (COMPAT_USE_64BIT_TIME)
184 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
186 return get_compat_timeval(tv, utv);
188 EXPORT_SYMBOL_GPL(compat_get_timeval);
190 int compat_put_timeval(const struct timeval *tv, void __user *utv)
192 if (COMPAT_USE_64BIT_TIME)
193 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
195 return put_compat_timeval(tv, utv);
197 EXPORT_SYMBOL_GPL(compat_put_timeval);
199 int compat_get_timespec(struct timespec *ts, const void __user *uts)
201 if (COMPAT_USE_64BIT_TIME)
202 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
204 return get_compat_timespec(ts, uts);
206 EXPORT_SYMBOL_GPL(compat_get_timespec);
208 int compat_put_timespec(const struct timespec *ts, void __user *uts)
210 if (COMPAT_USE_64BIT_TIME)
211 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
213 return put_compat_timespec(ts, uts);
215 EXPORT_SYMBOL_GPL(compat_put_timespec);
217 static long compat_nanosleep_restart(struct restart_block *restart)
219 struct compat_timespec __user *rmtp;
224 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
227 ret = hrtimer_nanosleep_restart(restart);
231 rmtp = restart->nanosleep.compat_rmtp;
233 if (rmtp && put_compat_timespec(&rmt, rmtp))
240 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
241 struct compat_timespec __user *rmtp)
243 struct timespec tu, rmt;
247 if (get_compat_timespec(&tu, rqtp))
250 if (!timespec_valid(&tu))
255 ret = hrtimer_nanosleep(&tu,
256 rmtp ? (struct timespec __user *)&rmt : NULL,
257 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
261 struct restart_block *restart
262 = ¤t_thread_info()->restart_block;
264 restart->fn = compat_nanosleep_restart;
265 restart->nanosleep.compat_rmtp = rmtp;
267 if (rmtp && put_compat_timespec(&rmt, rmtp))
274 static inline long get_compat_itimerval(struct itimerval *o,
275 struct compat_itimerval __user *i)
277 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
278 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
279 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
280 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
281 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
284 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
287 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
288 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
289 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
290 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
291 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
294 asmlinkage long compat_sys_getitimer(int which,
295 struct compat_itimerval __user *it)
297 struct itimerval kit;
300 error = do_getitimer(which, &kit);
301 if (!error && put_compat_itimerval(it, &kit))
306 asmlinkage long compat_sys_setitimer(int which,
307 struct compat_itimerval __user *in,
308 struct compat_itimerval __user *out)
310 struct itimerval kin, kout;
314 if (get_compat_itimerval(&kin, in))
317 memset(&kin, 0, sizeof(kin));
319 error = do_setitimer(which, &kin, out ? &kout : NULL);
322 if (put_compat_itimerval(out, &kout))
327 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
329 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
332 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
336 struct compat_tms tmp;
339 /* Convert our struct tms to the compat version. */
340 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
341 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
342 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
343 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
344 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
347 force_successful_syscall_return();
348 return compat_jiffies_to_clock_t(jiffies);
351 #ifdef __ARCH_WANT_SYS_SIGPENDING
354 * Assumption: old_sigset_t and compat_old_sigset_t are both
355 * types that can be passed to put_user()/get_user().
358 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
362 mm_segment_t old_fs = get_fs();
365 ret = sys_sigpending((old_sigset_t __user *) &s);
368 ret = put_user(s, set);
374 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
377 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
378 * blocked set of signals to the supplied signal set
380 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
382 memcpy(blocked->sig, &set, sizeof(set));
385 asmlinkage long compat_sys_sigprocmask(int how,
386 compat_old_sigset_t __user *nset,
387 compat_old_sigset_t __user *oset)
389 old_sigset_t old_set, new_set;
390 sigset_t new_blocked;
392 old_set = current->blocked.sig[0];
395 if (get_user(new_set, nset))
397 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
399 new_blocked = current->blocked;
403 sigaddsetmask(&new_blocked, new_set);
406 sigdelsetmask(&new_blocked, new_set);
409 compat_sig_setmask(&new_blocked, new_set);
415 set_current_blocked(&new_blocked);
419 if (put_user(old_set, oset))
428 asmlinkage long compat_sys_setrlimit(unsigned int resource,
429 struct compat_rlimit __user *rlim)
433 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
434 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
435 __get_user(r.rlim_max, &rlim->rlim_max))
438 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
439 r.rlim_cur = RLIM_INFINITY;
440 if (r.rlim_max == COMPAT_RLIM_INFINITY)
441 r.rlim_max = RLIM_INFINITY;
442 return do_prlimit(current, resource, &r, NULL);
445 #ifdef COMPAT_RLIM_OLD_INFINITY
447 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
448 struct compat_rlimit __user *rlim)
452 mm_segment_t old_fs = get_fs();
455 ret = sys_old_getrlimit(resource, &r);
459 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
460 r.rlim_cur = COMPAT_RLIM_INFINITY;
461 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
462 r.rlim_max = COMPAT_RLIM_INFINITY;
464 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
465 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
466 __put_user(r.rlim_max, &rlim->rlim_max))
474 asmlinkage long compat_sys_getrlimit(unsigned int resource,
475 struct compat_rlimit __user *rlim)
480 ret = do_prlimit(current, resource, NULL, &r);
482 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
483 r.rlim_cur = COMPAT_RLIM_INFINITY;
484 if (r.rlim_max > COMPAT_RLIM_INFINITY)
485 r.rlim_max = COMPAT_RLIM_INFINITY;
487 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
488 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
489 __put_user(r.rlim_max, &rlim->rlim_max))
495 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
497 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
498 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
499 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
500 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
501 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
502 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
503 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
504 __put_user(r->ru_idrss, &ru->ru_idrss) ||
505 __put_user(r->ru_isrss, &ru->ru_isrss) ||
506 __put_user(r->ru_minflt, &ru->ru_minflt) ||
507 __put_user(r->ru_majflt, &ru->ru_majflt) ||
508 __put_user(r->ru_nswap, &ru->ru_nswap) ||
509 __put_user(r->ru_inblock, &ru->ru_inblock) ||
510 __put_user(r->ru_oublock, &ru->ru_oublock) ||
511 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
512 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
513 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
514 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
515 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
520 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
524 mm_segment_t old_fs = get_fs();
527 ret = sys_getrusage(who, (struct rusage __user *) &r);
533 if (put_compat_rusage(&r, ru))
540 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
541 struct compat_rusage __user *ru)
544 return sys_wait4(pid, stat_addr, options, NULL);
549 mm_segment_t old_fs = get_fs();
554 (unsigned int __user *) &status : NULL),
555 options, (struct rusage __user *) &r);
559 if (put_compat_rusage(&r, ru))
561 if (stat_addr && put_user(status, stat_addr))
568 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
569 struct compat_siginfo __user *uinfo, int options,
570 struct compat_rusage __user *uru)
575 mm_segment_t old_fs = get_fs();
577 memset(&info, 0, sizeof(info));
580 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
581 uru ? (struct rusage __user *)&ru : NULL);
584 if ((ret < 0) || (info.si_signo == 0))
588 ret = put_compat_rusage(&ru, uru);
593 BUG_ON(info.si_code & __SI_MASK);
594 info.si_code |= __SI_CHLD;
595 return copy_siginfo_to_user32(uinfo, &info);
598 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
599 unsigned len, struct cpumask *new_mask)
603 if (len < cpumask_size())
604 memset(new_mask, 0, cpumask_size());
605 else if (len > cpumask_size())
606 len = cpumask_size();
608 k = cpumask_bits(new_mask);
609 return compat_get_bitmap(k, user_mask_ptr, len * 8);
612 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
614 compat_ulong_t __user *user_mask_ptr)
616 cpumask_var_t new_mask;
619 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
622 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
626 retval = sched_setaffinity(pid, new_mask);
628 free_cpumask_var(new_mask);
632 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
633 compat_ulong_t __user *user_mask_ptr)
638 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
640 if (len & (sizeof(compat_ulong_t)-1))
643 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
646 ret = sched_getaffinity(pid, mask);
648 size_t retlen = min_t(size_t, len, cpumask_size());
650 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
655 free_cpumask_var(mask);
660 int get_compat_itimerspec(struct itimerspec *dst,
661 const struct compat_itimerspec __user *src)
663 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
664 get_compat_timespec(&dst->it_value, &src->it_value))
669 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
670 const struct itimerspec *src)
672 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
673 put_compat_timespec(&src->it_value, &dst->it_value))
678 long compat_sys_timer_create(clockid_t which_clock,
679 struct compat_sigevent __user *timer_event_spec,
680 timer_t __user *created_timer_id)
682 struct sigevent __user *event = NULL;
684 if (timer_event_spec) {
685 struct sigevent kevent;
687 event = compat_alloc_user_space(sizeof(*event));
688 if (get_compat_sigevent(&kevent, timer_event_spec) ||
689 copy_to_user(event, &kevent, sizeof(*event)))
693 return sys_timer_create(which_clock, event, created_timer_id);
696 long compat_sys_timer_settime(timer_t timer_id, int flags,
697 struct compat_itimerspec __user *new,
698 struct compat_itimerspec __user *old)
702 struct itimerspec newts, oldts;
706 if (get_compat_itimerspec(&newts, new))
710 err = sys_timer_settime(timer_id, flags,
711 (struct itimerspec __user *) &newts,
712 (struct itimerspec __user *) &oldts);
714 if (!err && old && put_compat_itimerspec(old, &oldts))
719 long compat_sys_timer_gettime(timer_t timer_id,
720 struct compat_itimerspec __user *setting)
724 struct itimerspec ts;
728 err = sys_timer_gettime(timer_id,
729 (struct itimerspec __user *) &ts);
731 if (!err && put_compat_itimerspec(setting, &ts))
736 long compat_sys_clock_settime(clockid_t which_clock,
737 struct compat_timespec __user *tp)
743 if (get_compat_timespec(&ts, tp))
747 err = sys_clock_settime(which_clock,
748 (struct timespec __user *) &ts);
753 long compat_sys_clock_gettime(clockid_t which_clock,
754 struct compat_timespec __user *tp)
762 err = sys_clock_gettime(which_clock,
763 (struct timespec __user *) &ts);
765 if (!err && put_compat_timespec(&ts, tp))
770 long compat_sys_clock_adjtime(clockid_t which_clock,
771 struct compat_timex __user *utp)
777 err = compat_get_timex(&txc, utp);
783 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
786 err = compat_put_timex(utp, &txc);
793 long compat_sys_clock_getres(clockid_t which_clock,
794 struct compat_timespec __user *tp)
802 err = sys_clock_getres(which_clock,
803 (struct timespec __user *) &ts);
805 if (!err && tp && put_compat_timespec(&ts, tp))
810 static long compat_clock_nanosleep_restart(struct restart_block *restart)
815 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
817 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
820 err = clock_nanosleep_restart(restart);
823 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
824 put_compat_timespec(&tu, rmtp))
827 if (err == -ERESTART_RESTARTBLOCK) {
828 restart->fn = compat_clock_nanosleep_restart;
829 restart->nanosleep.compat_rmtp = rmtp;
834 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
835 struct compat_timespec __user *rqtp,
836 struct compat_timespec __user *rmtp)
840 struct timespec in, out;
841 struct restart_block *restart;
843 if (get_compat_timespec(&in, rqtp))
848 err = sys_clock_nanosleep(which_clock, flags,
849 (struct timespec __user *) &in,
850 (struct timespec __user *) &out);
853 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
854 put_compat_timespec(&out, rmtp))
857 if (err == -ERESTART_RESTARTBLOCK) {
858 restart = ¤t_thread_info()->restart_block;
859 restart->fn = compat_clock_nanosleep_restart;
860 restart->nanosleep.compat_rmtp = rmtp;
866 * We currently only need the following fields from the sigevent
867 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
868 * sigev_notify_thread_id). The others are handled in user mode.
869 * We also assume that copying sigev_value.sival_int is sufficient
870 * to keep all the bits of sigev_value.sival_ptr intact.
872 int get_compat_sigevent(struct sigevent *event,
873 const struct compat_sigevent __user *u_event)
875 memset(event, 0, sizeof(*event));
876 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
877 __get_user(event->sigev_value.sival_int,
878 &u_event->sigev_value.sival_int) ||
879 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
880 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
881 __get_user(event->sigev_notify_thread_id,
882 &u_event->sigev_notify_thread_id))
886 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
887 unsigned long bitmap_size)
892 unsigned long nr_compat_longs;
894 /* align bitmap up to nearest compat_long_t boundary */
895 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
897 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
900 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
902 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
905 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
907 * We dont want to read past the end of the userspace
908 * bitmap. We must however ensure the end of the
909 * kernel bitmap is zeroed.
911 if (nr_compat_longs-- > 0) {
912 if (__get_user(um, umask))
919 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
927 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
928 unsigned long bitmap_size)
933 unsigned long nr_compat_longs;
935 /* align bitmap up to nearest compat_long_t boundary */
936 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
938 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
941 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
943 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
946 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
950 * We dont want to write past the end of the userspace
953 if (nr_compat_longs-- > 0) {
954 if (__put_user(um, umask))
968 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
970 switch (_NSIG_WORDS) {
971 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
972 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
973 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
974 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
977 EXPORT_SYMBOL_GPL(sigset_from_compat);
980 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
981 struct compat_siginfo __user *uinfo,
982 struct compat_timespec __user *uts, compat_size_t sigsetsize)
990 if (sigsetsize != sizeof(sigset_t))
993 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
995 sigset_from_compat(&s, &s32);
998 if (get_compat_timespec(&t, uts))
1002 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1004 if (ret > 0 && uinfo) {
1005 if (copy_siginfo_to_user32(uinfo, &info))
1014 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
1015 struct compat_siginfo __user *uinfo)
1019 if (copy_siginfo_from_user32(&info, uinfo))
1021 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
1024 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1026 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1028 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1033 do_gettimeofday(&tv);
1037 if (put_user(i,tloc))
1040 force_successful_syscall_return();
1044 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1049 if (get_user(tv.tv_sec, tptr))
1054 err = security_settime(&tv, NULL);
1058 do_settimeofday(&tv);
1062 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1064 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1065 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1068 compat_sigset_t newset32;
1070 /* XXX: Don't preclude handling different sized sigset_t's. */
1071 if (sigsetsize != sizeof(sigset_t))
1074 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1076 sigset_from_compat(&newset, &newset32);
1077 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1079 current->saved_sigmask = current->blocked;
1080 set_current_blocked(&newset);
1082 current->state = TASK_INTERRUPTIBLE;
1084 set_restore_sigmask();
1085 return -ERESTARTNOHAND;
1087 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1089 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1094 err = compat_get_timex(&txc, utp);
1098 ret = do_adjtimex(&txc);
1100 err = compat_put_timex(utp, &txc);
1108 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1109 compat_uptr_t __user *pages32,
1110 const int __user *nodes,
1114 const void __user * __user *pages;
1117 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1118 for (i = 0; i < nr_pages; i++) {
1121 if (get_user(p, pages32 + i) ||
1122 put_user(compat_ptr(p), pages + i))
1125 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1128 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1129 compat_ulong_t maxnode,
1130 const compat_ulong_t __user *old_nodes,
1131 const compat_ulong_t __user *new_nodes)
1133 unsigned long __user *old = NULL;
1134 unsigned long __user *new = NULL;
1135 nodemask_t tmp_mask;
1136 unsigned long nr_bits;
1139 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1140 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1142 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1144 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1146 new = old + size / sizeof(unsigned long);
1147 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1151 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1154 new = compat_alloc_user_space(size);
1155 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1158 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1162 struct compat_sysinfo {
1176 char _f[20-2*sizeof(u32)-sizeof(int)];
1180 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1186 /* Check to see if any memory value is too large for 32-bit and scale
1189 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1192 while (s.mem_unit < PAGE_SIZE) {
1197 s.totalram >>= bitcount;
1198 s.freeram >>= bitcount;
1199 s.sharedram >>= bitcount;
1200 s.bufferram >>= bitcount;
1201 s.totalswap >>= bitcount;
1202 s.freeswap >>= bitcount;
1203 s.totalhigh >>= bitcount;
1204 s.freehigh >>= bitcount;
1207 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1208 __put_user (s.uptime, &info->uptime) ||
1209 __put_user (s.loads[0], &info->loads[0]) ||
1210 __put_user (s.loads[1], &info->loads[1]) ||
1211 __put_user (s.loads[2], &info->loads[2]) ||
1212 __put_user (s.totalram, &info->totalram) ||
1213 __put_user (s.freeram, &info->freeram) ||
1214 __put_user (s.sharedram, &info->sharedram) ||
1215 __put_user (s.bufferram, &info->bufferram) ||
1216 __put_user (s.totalswap, &info->totalswap) ||
1217 __put_user (s.freeswap, &info->freeswap) ||
1218 __put_user (s.procs, &info->procs) ||
1219 __put_user (s.totalhigh, &info->totalhigh) ||
1220 __put_user (s.freehigh, &info->freehigh) ||
1221 __put_user (s.mem_unit, &info->mem_unit))
1227 /* Note: it is necessary to treat option as an unsigned int,
1228 * with the corresponding cast to a signed int to ensure that the
1229 * proper conversion (sign extension) between the register representation
1230 * of a signed int (msr in 32-bit mode) and the register representation
1231 * of a signed int (msr in 64-bit mode) is performed.
1233 asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3,
1236 unsigned long a2 = arg2;
1238 /* PR_SET_PTRACER_ANY is -1, so can't do an unsigned extension */
1239 if (option == PR_SET_PTRACER && arg2 == (u32) PR_SET_PTRACER_ANY)
1240 a2 = PR_SET_PTRACER_ANY;
1242 return sys_prctl((int)option,
1244 (unsigned long) arg3,
1245 (unsigned long) arg4,
1246 (unsigned long) arg5);
1250 * Allocate user-space memory for the duration of a single system call,
1251 * in order to marshall parameters inside a compat thunk.
1253 void __user *compat_alloc_user_space(unsigned long len)
1257 /* If len would occupy more than half of the entire compat space... */
1258 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1261 ptr = arch_compat_alloc_user_space(len);
1263 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1268 EXPORT_SYMBOL_GPL(compat_alloc_user_space);