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>
33 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
35 memset(txc, 0, sizeof(struct timex));
37 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
38 __get_user(txc->modes, &utp->modes) ||
39 __get_user(txc->offset, &utp->offset) ||
40 __get_user(txc->freq, &utp->freq) ||
41 __get_user(txc->maxerror, &utp->maxerror) ||
42 __get_user(txc->esterror, &utp->esterror) ||
43 __get_user(txc->status, &utp->status) ||
44 __get_user(txc->constant, &utp->constant) ||
45 __get_user(txc->precision, &utp->precision) ||
46 __get_user(txc->tolerance, &utp->tolerance) ||
47 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
48 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
49 __get_user(txc->tick, &utp->tick) ||
50 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
51 __get_user(txc->jitter, &utp->jitter) ||
52 __get_user(txc->shift, &utp->shift) ||
53 __get_user(txc->stabil, &utp->stabil) ||
54 __get_user(txc->jitcnt, &utp->jitcnt) ||
55 __get_user(txc->calcnt, &utp->calcnt) ||
56 __get_user(txc->errcnt, &utp->errcnt) ||
57 __get_user(txc->stbcnt, &utp->stbcnt))
63 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
65 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
66 __put_user(txc->modes, &utp->modes) ||
67 __put_user(txc->offset, &utp->offset) ||
68 __put_user(txc->freq, &utp->freq) ||
69 __put_user(txc->maxerror, &utp->maxerror) ||
70 __put_user(txc->esterror, &utp->esterror) ||
71 __put_user(txc->status, &utp->status) ||
72 __put_user(txc->constant, &utp->constant) ||
73 __put_user(txc->precision, &utp->precision) ||
74 __put_user(txc->tolerance, &utp->tolerance) ||
75 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
76 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
77 __put_user(txc->tick, &utp->tick) ||
78 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
79 __put_user(txc->jitter, &utp->jitter) ||
80 __put_user(txc->shift, &utp->shift) ||
81 __put_user(txc->stabil, &utp->stabil) ||
82 __put_user(txc->jitcnt, &utp->jitcnt) ||
83 __put_user(txc->calcnt, &utp->calcnt) ||
84 __put_user(txc->errcnt, &utp->errcnt) ||
85 __put_user(txc->stbcnt, &utp->stbcnt) ||
86 __put_user(txc->tai, &utp->tai))
91 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
92 struct timezone __user *, tz)
96 do_gettimeofday(&ktv);
97 if (compat_put_timeval(&ktv, tv))
101 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
108 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109 struct timezone __user *, tz)
111 struct timeval user_tv;
112 struct timespec new_ts;
113 struct timezone new_tz;
116 if (compat_get_timeval(&user_tv, tv))
118 new_ts.tv_sec = user_tv.tv_sec;
119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
122 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
126 return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
129 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
131 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
132 __get_user(tv->tv_sec, &ctv->tv_sec) ||
133 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
136 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
138 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
139 __put_user(tv->tv_sec, &ctv->tv_sec) ||
140 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
143 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
145 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
146 __get_user(ts->tv_sec, &cts->tv_sec) ||
147 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
150 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
152 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
153 __put_user(ts->tv_sec, &cts->tv_sec) ||
154 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
157 int compat_get_timeval(struct timeval *tv, const void __user *utv)
159 if (COMPAT_USE_64BIT_TIME)
160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
162 return __compat_get_timeval(tv, utv);
164 EXPORT_SYMBOL_GPL(compat_get_timeval);
166 int compat_put_timeval(const struct timeval *tv, void __user *utv)
168 if (COMPAT_USE_64BIT_TIME)
169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
171 return __compat_put_timeval(tv, utv);
173 EXPORT_SYMBOL_GPL(compat_put_timeval);
175 int compat_get_timespec(struct timespec *ts, const void __user *uts)
177 if (COMPAT_USE_64BIT_TIME)
178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
180 return __compat_get_timespec(ts, uts);
182 EXPORT_SYMBOL_GPL(compat_get_timespec);
184 int compat_put_timespec(const struct timespec *ts, void __user *uts)
186 if (COMPAT_USE_64BIT_TIME)
187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
189 return __compat_put_timespec(ts, uts);
191 EXPORT_SYMBOL_GPL(compat_put_timespec);
193 int compat_convert_timespec(struct timespec __user **kts,
194 const void __user *cts)
197 struct timespec __user *uts;
199 if (!cts || COMPAT_USE_64BIT_TIME) {
200 *kts = (struct timespec __user *)cts;
204 uts = compat_alloc_user_space(sizeof(ts));
207 if (compat_get_timespec(&ts, cts))
209 if (copy_to_user(uts, &ts, sizeof(ts)))
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);
229 if (ret == -ERESTART_RESTARTBLOCK) {
230 rmtp = restart->nanosleep.compat_rmtp;
232 if (rmtp && compat_put_timespec(&rmt, rmtp))
239 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240 struct compat_timespec __user *, rmtp)
242 struct timespec tu, rmt;
246 if (compat_get_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 * hrtimer_nanosleep() can only return 0 or
261 * -ERESTART_RESTARTBLOCK here because:
263 * - we call it with HRTIMER_MODE_REL and therefor exclude the
264 * -ERESTARTNOHAND return path.
266 * - we supply the rmtp argument from the task stack (due to
267 * the necessary compat conversion. So the update cannot
268 * fail, which excludes the -EFAULT return path as well. If
269 * it fails nevertheless we have a bigger problem and wont
270 * reach this place anymore.
272 * - if the return value is 0, we do not have to update rmtp
273 * because there is no remaining time.
275 * We check for -ERESTART_RESTARTBLOCK nevertheless if the
276 * core implementation decides to return random nonsense.
278 if (ret == -ERESTART_RESTARTBLOCK) {
279 struct restart_block *restart = ¤t->restart_block;
281 restart->fn = compat_nanosleep_restart;
282 restart->nanosleep.compat_rmtp = rmtp;
284 if (rmtp && compat_put_timespec(&rmt, rmtp))
290 static inline long get_compat_itimerval(struct itimerval *o,
291 struct compat_itimerval __user *i)
293 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
294 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
295 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
296 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
297 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
300 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
303 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
304 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
305 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
306 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
307 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
310 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
311 struct compat_itimerval __user *, it)
313 struct itimerval kit;
316 error = do_getitimer(which, &kit);
317 if (!error && put_compat_itimerval(it, &kit))
322 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
323 struct compat_itimerval __user *, in,
324 struct compat_itimerval __user *, out)
326 struct itimerval kin, kout;
330 if (get_compat_itimerval(&kin, in))
333 memset(&kin, 0, sizeof(kin));
335 error = do_setitimer(which, &kin, out ? &kout : NULL);
338 if (put_compat_itimerval(out, &kout))
343 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
345 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
348 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
352 struct compat_tms tmp;
355 /* Convert our struct tms to the compat version. */
356 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
357 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
358 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
359 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
360 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
363 force_successful_syscall_return();
364 return compat_jiffies_to_clock_t(jiffies);
367 #ifdef __ARCH_WANT_SYS_SIGPENDING
370 * Assumption: old_sigset_t and compat_old_sigset_t are both
371 * types that can be passed to put_user()/get_user().
374 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
378 mm_segment_t old_fs = get_fs();
381 ret = sys_sigpending((old_sigset_t __user *) &s);
384 ret = put_user(s, set);
390 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
393 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
394 * blocked set of signals to the supplied signal set
396 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
398 memcpy(blocked->sig, &set, sizeof(set));
401 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
402 compat_old_sigset_t __user *, nset,
403 compat_old_sigset_t __user *, oset)
405 old_sigset_t old_set, new_set;
406 sigset_t new_blocked;
408 old_set = current->blocked.sig[0];
411 if (get_user(new_set, nset))
413 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
415 new_blocked = current->blocked;
419 sigaddsetmask(&new_blocked, new_set);
422 sigdelsetmask(&new_blocked, new_set);
425 compat_sig_setmask(&new_blocked, new_set);
431 set_current_blocked(&new_blocked);
435 if (put_user(old_set, oset))
444 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
445 struct compat_rlimit __user *, rlim)
449 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
450 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
451 __get_user(r.rlim_max, &rlim->rlim_max))
454 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
455 r.rlim_cur = RLIM_INFINITY;
456 if (r.rlim_max == COMPAT_RLIM_INFINITY)
457 r.rlim_max = RLIM_INFINITY;
458 return do_prlimit(current, resource, &r, NULL);
461 #ifdef COMPAT_RLIM_OLD_INFINITY
463 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
464 struct compat_rlimit __user *, rlim)
468 mm_segment_t old_fs = get_fs();
471 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
475 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
476 r.rlim_cur = COMPAT_RLIM_INFINITY;
477 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
478 r.rlim_max = COMPAT_RLIM_INFINITY;
480 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
481 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
482 __put_user(r.rlim_max, &rlim->rlim_max))
490 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
491 struct compat_rlimit __user *, rlim)
496 ret = do_prlimit(current, resource, NULL, &r);
498 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
499 r.rlim_cur = COMPAT_RLIM_INFINITY;
500 if (r.rlim_max > COMPAT_RLIM_INFINITY)
501 r.rlim_max = COMPAT_RLIM_INFINITY;
503 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
504 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
505 __put_user(r.rlim_max, &rlim->rlim_max))
511 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
513 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
514 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
515 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
516 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
517 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
518 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
519 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
520 __put_user(r->ru_idrss, &ru->ru_idrss) ||
521 __put_user(r->ru_isrss, &ru->ru_isrss) ||
522 __put_user(r->ru_minflt, &ru->ru_minflt) ||
523 __put_user(r->ru_majflt, &ru->ru_majflt) ||
524 __put_user(r->ru_nswap, &ru->ru_nswap) ||
525 __put_user(r->ru_inblock, &ru->ru_inblock) ||
526 __put_user(r->ru_oublock, &ru->ru_oublock) ||
527 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
528 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
529 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
530 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
531 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
536 COMPAT_SYSCALL_DEFINE4(wait4,
538 compat_uint_t __user *, stat_addr,
540 struct compat_rusage __user *, ru)
543 return sys_wait4(pid, stat_addr, options, NULL);
548 mm_segment_t old_fs = get_fs();
553 (unsigned int __user *) &status : NULL),
554 options, (struct rusage __user *) &r);
558 if (put_compat_rusage(&r, ru))
560 if (stat_addr && put_user(status, stat_addr))
567 COMPAT_SYSCALL_DEFINE5(waitid,
568 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 /* sys_waitid() overwrites everything in ru */
589 if (COMPAT_USE_64BIT_TIME)
590 ret = copy_to_user(uru, &ru, sizeof(ru));
592 ret = put_compat_rusage(&ru, uru);
597 BUG_ON(info.si_code & __SI_MASK);
598 info.si_code |= __SI_CHLD;
599 return copy_siginfo_to_user32(uinfo, &info);
602 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
603 unsigned len, struct cpumask *new_mask)
607 if (len < cpumask_size())
608 memset(new_mask, 0, cpumask_size());
609 else if (len > cpumask_size())
610 len = cpumask_size();
612 k = cpumask_bits(new_mask);
613 return compat_get_bitmap(k, user_mask_ptr, len * 8);
616 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
618 compat_ulong_t __user *, user_mask_ptr)
620 cpumask_var_t new_mask;
623 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
626 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
630 retval = sched_setaffinity(pid, new_mask);
632 free_cpumask_var(new_mask);
636 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
637 compat_ulong_t __user *, user_mask_ptr)
642 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
644 if (len & (sizeof(compat_ulong_t)-1))
647 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
650 ret = sched_getaffinity(pid, mask);
652 size_t retlen = min_t(size_t, len, cpumask_size());
654 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
659 free_cpumask_var(mask);
664 int get_compat_itimerspec(struct itimerspec *dst,
665 const struct compat_itimerspec __user *src)
667 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
668 __compat_get_timespec(&dst->it_value, &src->it_value))
673 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
674 const struct itimerspec *src)
676 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
677 __compat_put_timespec(&src->it_value, &dst->it_value))
682 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
683 struct compat_sigevent __user *, timer_event_spec,
684 timer_t __user *, created_timer_id)
686 struct sigevent __user *event = NULL;
688 if (timer_event_spec) {
689 struct sigevent kevent;
691 event = compat_alloc_user_space(sizeof(*event));
692 if (get_compat_sigevent(&kevent, timer_event_spec) ||
693 copy_to_user(event, &kevent, sizeof(*event)))
697 return sys_timer_create(which_clock, event, created_timer_id);
700 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
701 struct compat_itimerspec __user *, new,
702 struct compat_itimerspec __user *, old)
706 struct itimerspec newts, oldts;
710 if (get_compat_itimerspec(&newts, new))
714 err = sys_timer_settime(timer_id, flags,
715 (struct itimerspec __user *) &newts,
716 (struct itimerspec __user *) &oldts);
718 if (!err && old && put_compat_itimerspec(old, &oldts))
723 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
724 struct compat_itimerspec __user *, setting)
728 struct itimerspec ts;
732 err = sys_timer_gettime(timer_id,
733 (struct itimerspec __user *) &ts);
735 if (!err && put_compat_itimerspec(setting, &ts))
740 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
741 struct compat_timespec __user *, tp)
747 if (compat_get_timespec(&ts, tp))
751 err = sys_clock_settime(which_clock,
752 (struct timespec __user *) &ts);
757 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
758 struct compat_timespec __user *, tp)
766 err = sys_clock_gettime(which_clock,
767 (struct timespec __user *) &ts);
769 if (!err && compat_put_timespec(&ts, tp))
774 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
775 struct compat_timex __user *, utp)
781 err = compat_get_timex(&txc, utp);
787 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
790 err = compat_put_timex(utp, &txc);
797 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
798 struct compat_timespec __user *, tp)
806 err = sys_clock_getres(which_clock,
807 (struct timespec __user *) &ts);
809 if (!err && tp && compat_put_timespec(&ts, tp))
814 static long compat_clock_nanosleep_restart(struct restart_block *restart)
819 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
821 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
824 err = clock_nanosleep_restart(restart);
827 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
828 compat_put_timespec(&tu, rmtp))
831 if (err == -ERESTART_RESTARTBLOCK) {
832 restart->fn = compat_clock_nanosleep_restart;
833 restart->nanosleep.compat_rmtp = rmtp;
838 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
839 struct compat_timespec __user *, rqtp,
840 struct compat_timespec __user *, rmtp)
844 struct timespec in, out;
845 struct restart_block *restart;
847 if (compat_get_timespec(&in, rqtp))
852 err = sys_clock_nanosleep(which_clock, flags,
853 (struct timespec __user *) &in,
854 (struct timespec __user *) &out);
857 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
858 compat_put_timespec(&out, rmtp))
861 if (err == -ERESTART_RESTARTBLOCK) {
862 restart = ¤t->restart_block;
863 restart->fn = compat_clock_nanosleep_restart;
864 restart->nanosleep.compat_rmtp = rmtp;
870 * We currently only need the following fields from the sigevent
871 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
872 * sigev_notify_thread_id). The others are handled in user mode.
873 * We also assume that copying sigev_value.sival_int is sufficient
874 * to keep all the bits of sigev_value.sival_ptr intact.
876 int get_compat_sigevent(struct sigevent *event,
877 const struct compat_sigevent __user *u_event)
879 memset(event, 0, sizeof(*event));
880 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
881 __get_user(event->sigev_value.sival_int,
882 &u_event->sigev_value.sival_int) ||
883 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
884 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
885 __get_user(event->sigev_notify_thread_id,
886 &u_event->sigev_notify_thread_id))
890 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
891 unsigned long bitmap_size)
896 unsigned long nr_compat_longs;
898 /* align bitmap up to nearest compat_long_t boundary */
899 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
901 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
904 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
906 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
909 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
911 * We dont want to read past the end of the userspace
912 * bitmap. We must however ensure the end of the
913 * kernel bitmap is zeroed.
915 if (nr_compat_longs) {
917 if (__get_user(um, umask))
924 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
932 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
933 unsigned long bitmap_size)
938 unsigned long nr_compat_longs;
940 /* align bitmap up to nearest compat_long_t boundary */
941 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
943 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
946 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
948 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
951 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
955 * We dont want to write past the end of the userspace
958 if (nr_compat_longs) {
960 if (__put_user(um, umask))
974 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
976 switch (_NSIG_WORDS) {
977 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
978 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
979 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
980 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
983 EXPORT_SYMBOL_GPL(sigset_from_compat);
986 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
988 switch (_NSIG_WORDS) {
989 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
990 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
991 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
992 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
996 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
997 struct compat_siginfo __user *, uinfo,
998 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1000 compat_sigset_t s32;
1006 if (sigsetsize != sizeof(sigset_t))
1009 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1011 sigset_from_compat(&s, &s32);
1014 if (compat_get_timespec(&t, uts))
1018 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1020 if (ret > 0 && uinfo) {
1021 if (copy_siginfo_to_user32(uinfo, &info))
1028 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1030 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1032 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1037 do_gettimeofday(&tv);
1041 if (put_user(i,tloc))
1044 force_successful_syscall_return();
1048 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1053 if (get_user(tv.tv_sec, tptr))
1058 err = security_settime(&tv, NULL);
1062 do_settimeofday(&tv);
1066 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1068 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1073 err = compat_get_timex(&txc, utp);
1077 ret = do_adjtimex(&txc);
1079 err = compat_put_timex(utp, &txc);
1087 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1088 compat_uptr_t __user *, pages32,
1089 const int __user *, nodes,
1090 int __user *, status,
1093 const void __user * __user *pages;
1096 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1097 for (i = 0; i < nr_pages; i++) {
1100 if (get_user(p, pages32 + i) ||
1101 put_user(compat_ptr(p), pages + i))
1104 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1107 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1108 compat_ulong_t, maxnode,
1109 const compat_ulong_t __user *, old_nodes,
1110 const compat_ulong_t __user *, new_nodes)
1112 unsigned long __user *old = NULL;
1113 unsigned long __user *new = NULL;
1114 nodemask_t tmp_mask;
1115 unsigned long nr_bits;
1118 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1119 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1121 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1123 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1125 new = old + size / sizeof(unsigned long);
1126 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1130 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1133 new = compat_alloc_user_space(size);
1134 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1137 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1141 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1143 struct compat_timespec __user *, interval)
1147 mm_segment_t old_fs = get_fs();
1150 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1152 if (compat_put_timespec(&t, interval))
1158 * Allocate user-space memory for the duration of a single system call,
1159 * in order to marshall parameters inside a compat thunk.
1161 void __user *compat_alloc_user_space(unsigned long len)
1165 /* If len would occupy more than half of the entire compat space... */
1166 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1169 ptr = arch_compat_alloc_user_space(len);
1171 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1176 EXPORT_SYMBOL_GPL(compat_alloc_user_space);