btrfs: rename the option to nospace_cache
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / compat.c
blobe2435ee9993a329bee48252a38af4ca69e6c4742
1 /*
2 * linux/kernel/compat.c
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
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/migrate.h>
25 #include <linux/posix-timers.h>
26 #include <linux/times.h>
27 #include <linux/ptrace.h>
28 #include <linux/gfp.h>
30 #include <asm/uaccess.h>
33 * Note that the native side is already converted to a timespec, because
34 * that's what we want anyway.
36 static int compat_get_timeval(struct timespec *o,
37 struct compat_timeval __user *i)
39 long usec;
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;
48 static int compat_put_timeval(struct compat_timeval __user *o,
49 struct timeval *i)
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))
80 return -EFAULT;
82 return 0;
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))
109 return -EFAULT;
110 return 0;
113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
114 struct timezone __user *tz)
116 if (tv) {
117 struct timeval ktv;
118 do_gettimeofday(&ktv);
119 if (compat_put_timeval(tv, &ktv))
120 return -EFAULT;
122 if (tz) {
123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
124 return -EFAULT;
127 return 0;
130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
131 struct timezone __user *tz)
133 struct timespec kts;
134 struct timezone ktz;
136 if (tv) {
137 if (compat_get_timeval(&kts, tv))
138 return -EFAULT;
140 if (tz) {
141 if (copy_from_user(&ktz, tz, sizeof(ktz)))
142 return -EFAULT;
145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
148 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
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;
155 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
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;
161 EXPORT_SYMBOL_GPL(put_compat_timespec);
163 static long compat_nanosleep_restart(struct restart_block *restart)
165 struct compat_timespec __user *rmtp;
166 struct timespec rmt;
167 mm_segment_t oldfs;
168 long ret;
170 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
171 oldfs = get_fs();
172 set_fs(KERNEL_DS);
173 ret = hrtimer_nanosleep_restart(restart);
174 set_fs(oldfs);
176 if (ret) {
177 rmtp = restart->nanosleep.compat_rmtp;
179 if (rmtp && put_compat_timespec(&rmt, rmtp))
180 return -EFAULT;
183 return ret;
186 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
187 struct compat_timespec __user *rmtp)
189 struct timespec tu, rmt;
190 mm_segment_t oldfs;
191 long ret;
193 if (get_compat_timespec(&tu, rqtp))
194 return -EFAULT;
196 if (!timespec_valid(&tu))
197 return -EINVAL;
199 oldfs = get_fs();
200 set_fs(KERNEL_DS);
201 ret = hrtimer_nanosleep(&tu,
202 rmtp ? (struct timespec __user *)&rmt : NULL,
203 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
204 set_fs(oldfs);
206 if (ret) {
207 struct restart_block *restart
208 = &current_thread_info()->restart_block;
210 restart->fn = compat_nanosleep_restart;
211 restart->nanosleep.compat_rmtp = rmtp;
213 if (rmtp && put_compat_timespec(&rmt, rmtp))
214 return -EFAULT;
217 return ret;
220 static inline long get_compat_itimerval(struct itimerval *o,
221 struct compat_itimerval __user *i)
223 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
224 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
225 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
226 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
227 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
230 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
231 struct itimerval *i)
233 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
234 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
235 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
236 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
237 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
240 asmlinkage long compat_sys_getitimer(int which,
241 struct compat_itimerval __user *it)
243 struct itimerval kit;
244 int error;
246 error = do_getitimer(which, &kit);
247 if (!error && put_compat_itimerval(it, &kit))
248 error = -EFAULT;
249 return error;
252 asmlinkage long compat_sys_setitimer(int which,
253 struct compat_itimerval __user *in,
254 struct compat_itimerval __user *out)
256 struct itimerval kin, kout;
257 int error;
259 if (in) {
260 if (get_compat_itimerval(&kin, in))
261 return -EFAULT;
262 } else
263 memset(&kin, 0, sizeof(kin));
265 error = do_setitimer(which, &kin, out ? &kout : NULL);
266 if (error || !out)
267 return error;
268 if (put_compat_itimerval(out, &kout))
269 return -EFAULT;
270 return 0;
273 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
275 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
278 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
280 if (tbuf) {
281 struct tms tms;
282 struct compat_tms tmp;
284 do_sys_times(&tms);
285 /* Convert our struct tms to the compat version. */
286 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
287 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
288 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
289 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
290 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
291 return -EFAULT;
293 force_successful_syscall_return();
294 return compat_jiffies_to_clock_t(jiffies);
297 #ifdef __ARCH_WANT_SYS_SIGPENDING
300 * Assumption: old_sigset_t and compat_old_sigset_t are both
301 * types that can be passed to put_user()/get_user().
304 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
306 old_sigset_t s;
307 long ret;
308 mm_segment_t old_fs = get_fs();
310 set_fs(KERNEL_DS);
311 ret = sys_sigpending((old_sigset_t __user *) &s);
312 set_fs(old_fs);
313 if (ret == 0)
314 ret = put_user(s, set);
315 return ret;
318 #endif
320 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
322 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
323 compat_old_sigset_t __user *oset)
325 old_sigset_t s;
326 long ret;
327 mm_segment_t old_fs;
329 if (set && get_user(s, set))
330 return -EFAULT;
331 old_fs = get_fs();
332 set_fs(KERNEL_DS);
333 ret = sys_sigprocmask(how,
334 set ? (old_sigset_t __user *) &s : NULL,
335 oset ? (old_sigset_t __user *) &s : NULL);
336 set_fs(old_fs);
337 if (ret == 0)
338 if (oset)
339 ret = put_user(s, oset);
340 return ret;
343 #endif
345 asmlinkage long compat_sys_setrlimit(unsigned int resource,
346 struct compat_rlimit __user *rlim)
348 struct rlimit r;
350 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
351 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
352 __get_user(r.rlim_max, &rlim->rlim_max))
353 return -EFAULT;
355 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
356 r.rlim_cur = RLIM_INFINITY;
357 if (r.rlim_max == COMPAT_RLIM_INFINITY)
358 r.rlim_max = RLIM_INFINITY;
359 return do_prlimit(current, resource, &r, NULL);
362 #ifdef COMPAT_RLIM_OLD_INFINITY
364 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
365 struct compat_rlimit __user *rlim)
367 struct rlimit r;
368 int ret;
369 mm_segment_t old_fs = get_fs();
371 set_fs(KERNEL_DS);
372 ret = sys_old_getrlimit(resource, &r);
373 set_fs(old_fs);
375 if (!ret) {
376 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
377 r.rlim_cur = COMPAT_RLIM_INFINITY;
378 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
379 r.rlim_max = COMPAT_RLIM_INFINITY;
381 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
382 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
383 __put_user(r.rlim_max, &rlim->rlim_max))
384 return -EFAULT;
386 return ret;
389 #endif
391 asmlinkage long compat_sys_getrlimit(unsigned int resource,
392 struct compat_rlimit __user *rlim)
394 struct rlimit r;
395 int ret;
397 ret = do_prlimit(current, resource, NULL, &r);
398 if (!ret) {
399 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
400 r.rlim_cur = COMPAT_RLIM_INFINITY;
401 if (r.rlim_max > COMPAT_RLIM_INFINITY)
402 r.rlim_max = COMPAT_RLIM_INFINITY;
404 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
405 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
406 __put_user(r.rlim_max, &rlim->rlim_max))
407 return -EFAULT;
409 return ret;
412 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
414 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
415 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
416 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
417 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
418 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
419 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
420 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
421 __put_user(r->ru_idrss, &ru->ru_idrss) ||
422 __put_user(r->ru_isrss, &ru->ru_isrss) ||
423 __put_user(r->ru_minflt, &ru->ru_minflt) ||
424 __put_user(r->ru_majflt, &ru->ru_majflt) ||
425 __put_user(r->ru_nswap, &ru->ru_nswap) ||
426 __put_user(r->ru_inblock, &ru->ru_inblock) ||
427 __put_user(r->ru_oublock, &ru->ru_oublock) ||
428 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
429 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
430 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
431 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
432 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
433 return -EFAULT;
434 return 0;
437 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
439 struct rusage r;
440 int ret;
441 mm_segment_t old_fs = get_fs();
443 set_fs(KERNEL_DS);
444 ret = sys_getrusage(who, (struct rusage __user *) &r);
445 set_fs(old_fs);
447 if (ret)
448 return ret;
450 if (put_compat_rusage(&r, ru))
451 return -EFAULT;
453 return 0;
456 asmlinkage long
457 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
458 struct compat_rusage __user *ru)
460 if (!ru) {
461 return sys_wait4(pid, stat_addr, options, NULL);
462 } else {
463 struct rusage r;
464 int ret;
465 unsigned int status;
466 mm_segment_t old_fs = get_fs();
468 set_fs (KERNEL_DS);
469 ret = sys_wait4(pid,
470 (stat_addr ?
471 (unsigned int __user *) &status : NULL),
472 options, (struct rusage __user *) &r);
473 set_fs (old_fs);
475 if (ret > 0) {
476 if (put_compat_rusage(&r, ru))
477 return -EFAULT;
478 if (stat_addr && put_user(status, stat_addr))
479 return -EFAULT;
481 return ret;
485 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
486 struct compat_siginfo __user *uinfo, int options,
487 struct compat_rusage __user *uru)
489 siginfo_t info;
490 struct rusage ru;
491 long ret;
492 mm_segment_t old_fs = get_fs();
494 memset(&info, 0, sizeof(info));
496 set_fs(KERNEL_DS);
497 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
498 uru ? (struct rusage __user *)&ru : NULL);
499 set_fs(old_fs);
501 if ((ret < 0) || (info.si_signo == 0))
502 return ret;
504 if (uru) {
505 ret = put_compat_rusage(&ru, uru);
506 if (ret)
507 return ret;
510 BUG_ON(info.si_code & __SI_MASK);
511 info.si_code |= __SI_CHLD;
512 return copy_siginfo_to_user32(uinfo, &info);
515 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
516 unsigned len, struct cpumask *new_mask)
518 unsigned long *k;
520 if (len < cpumask_size())
521 memset(new_mask, 0, cpumask_size());
522 else if (len > cpumask_size())
523 len = cpumask_size();
525 k = cpumask_bits(new_mask);
526 return compat_get_bitmap(k, user_mask_ptr, len * 8);
529 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
530 unsigned int len,
531 compat_ulong_t __user *user_mask_ptr)
533 cpumask_var_t new_mask;
534 int retval;
536 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
537 return -ENOMEM;
539 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
540 if (retval)
541 goto out;
543 retval = sched_setaffinity(pid, new_mask);
544 out:
545 free_cpumask_var(new_mask);
546 return retval;
549 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
550 compat_ulong_t __user *user_mask_ptr)
552 int ret;
553 cpumask_var_t mask;
555 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
556 return -EINVAL;
557 if (len & (sizeof(compat_ulong_t)-1))
558 return -EINVAL;
560 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
561 return -ENOMEM;
563 ret = sched_getaffinity(pid, mask);
564 if (ret == 0) {
565 size_t retlen = min_t(size_t, len, cpumask_size());
567 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
568 ret = -EFAULT;
569 else
570 ret = retlen;
572 free_cpumask_var(mask);
574 return ret;
577 int get_compat_itimerspec(struct itimerspec *dst,
578 const struct compat_itimerspec __user *src)
580 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
581 get_compat_timespec(&dst->it_value, &src->it_value))
582 return -EFAULT;
583 return 0;
586 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
587 const struct itimerspec *src)
589 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
590 put_compat_timespec(&src->it_value, &dst->it_value))
591 return -EFAULT;
592 return 0;
595 long compat_sys_timer_create(clockid_t which_clock,
596 struct compat_sigevent __user *timer_event_spec,
597 timer_t __user *created_timer_id)
599 struct sigevent __user *event = NULL;
601 if (timer_event_spec) {
602 struct sigevent kevent;
604 event = compat_alloc_user_space(sizeof(*event));
605 if (get_compat_sigevent(&kevent, timer_event_spec) ||
606 copy_to_user(event, &kevent, sizeof(*event)))
607 return -EFAULT;
610 return sys_timer_create(which_clock, event, created_timer_id);
613 long compat_sys_timer_settime(timer_t timer_id, int flags,
614 struct compat_itimerspec __user *new,
615 struct compat_itimerspec __user *old)
617 long err;
618 mm_segment_t oldfs;
619 struct itimerspec newts, oldts;
621 if (!new)
622 return -EINVAL;
623 if (get_compat_itimerspec(&newts, new))
624 return -EFAULT;
625 oldfs = get_fs();
626 set_fs(KERNEL_DS);
627 err = sys_timer_settime(timer_id, flags,
628 (struct itimerspec __user *) &newts,
629 (struct itimerspec __user *) &oldts);
630 set_fs(oldfs);
631 if (!err && old && put_compat_itimerspec(old, &oldts))
632 return -EFAULT;
633 return err;
636 long compat_sys_timer_gettime(timer_t timer_id,
637 struct compat_itimerspec __user *setting)
639 long err;
640 mm_segment_t oldfs;
641 struct itimerspec ts;
643 oldfs = get_fs();
644 set_fs(KERNEL_DS);
645 err = sys_timer_gettime(timer_id,
646 (struct itimerspec __user *) &ts);
647 set_fs(oldfs);
648 if (!err && put_compat_itimerspec(setting, &ts))
649 return -EFAULT;
650 return err;
653 long compat_sys_clock_settime(clockid_t which_clock,
654 struct compat_timespec __user *tp)
656 long err;
657 mm_segment_t oldfs;
658 struct timespec ts;
660 if (get_compat_timespec(&ts, tp))
661 return -EFAULT;
662 oldfs = get_fs();
663 set_fs(KERNEL_DS);
664 err = sys_clock_settime(which_clock,
665 (struct timespec __user *) &ts);
666 set_fs(oldfs);
667 return err;
670 long compat_sys_clock_gettime(clockid_t which_clock,
671 struct compat_timespec __user *tp)
673 long err;
674 mm_segment_t oldfs;
675 struct timespec ts;
677 oldfs = get_fs();
678 set_fs(KERNEL_DS);
679 err = sys_clock_gettime(which_clock,
680 (struct timespec __user *) &ts);
681 set_fs(oldfs);
682 if (!err && put_compat_timespec(&ts, tp))
683 return -EFAULT;
684 return err;
687 long compat_sys_clock_adjtime(clockid_t which_clock,
688 struct compat_timex __user *utp)
690 struct timex txc;
691 mm_segment_t oldfs;
692 int err, ret;
694 err = compat_get_timex(&txc, utp);
695 if (err)
696 return err;
698 oldfs = get_fs();
699 set_fs(KERNEL_DS);
700 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
701 set_fs(oldfs);
703 err = compat_put_timex(utp, &txc);
704 if (err)
705 return err;
707 return ret;
710 long compat_sys_clock_getres(clockid_t which_clock,
711 struct compat_timespec __user *tp)
713 long err;
714 mm_segment_t oldfs;
715 struct timespec ts;
717 oldfs = get_fs();
718 set_fs(KERNEL_DS);
719 err = sys_clock_getres(which_clock,
720 (struct timespec __user *) &ts);
721 set_fs(oldfs);
722 if (!err && tp && put_compat_timespec(&ts, tp))
723 return -EFAULT;
724 return err;
727 static long compat_clock_nanosleep_restart(struct restart_block *restart)
729 long err;
730 mm_segment_t oldfs;
731 struct timespec tu;
732 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
734 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
735 oldfs = get_fs();
736 set_fs(KERNEL_DS);
737 err = clock_nanosleep_restart(restart);
738 set_fs(oldfs);
740 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
741 put_compat_timespec(&tu, rmtp))
742 return -EFAULT;
744 if (err == -ERESTART_RESTARTBLOCK) {
745 restart->fn = compat_clock_nanosleep_restart;
746 restart->nanosleep.compat_rmtp = rmtp;
748 return err;
751 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
752 struct compat_timespec __user *rqtp,
753 struct compat_timespec __user *rmtp)
755 long err;
756 mm_segment_t oldfs;
757 struct timespec in, out;
758 struct restart_block *restart;
760 if (get_compat_timespec(&in, rqtp))
761 return -EFAULT;
763 oldfs = get_fs();
764 set_fs(KERNEL_DS);
765 err = sys_clock_nanosleep(which_clock, flags,
766 (struct timespec __user *) &in,
767 (struct timespec __user *) &out);
768 set_fs(oldfs);
770 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
771 put_compat_timespec(&out, rmtp))
772 return -EFAULT;
774 if (err == -ERESTART_RESTARTBLOCK) {
775 restart = &current_thread_info()->restart_block;
776 restart->fn = compat_clock_nanosleep_restart;
777 restart->nanosleep.compat_rmtp = rmtp;
779 return err;
783 * We currently only need the following fields from the sigevent
784 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
785 * sigev_notify_thread_id). The others are handled in user mode.
786 * We also assume that copying sigev_value.sival_int is sufficient
787 * to keep all the bits of sigev_value.sival_ptr intact.
789 int get_compat_sigevent(struct sigevent *event,
790 const struct compat_sigevent __user *u_event)
792 memset(event, 0, sizeof(*event));
793 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
794 __get_user(event->sigev_value.sival_int,
795 &u_event->sigev_value.sival_int) ||
796 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
797 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
798 __get_user(event->sigev_notify_thread_id,
799 &u_event->sigev_notify_thread_id))
800 ? -EFAULT : 0;
803 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
804 unsigned long bitmap_size)
806 int i, j;
807 unsigned long m;
808 compat_ulong_t um;
809 unsigned long nr_compat_longs;
811 /* align bitmap up to nearest compat_long_t boundary */
812 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
814 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
815 return -EFAULT;
817 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
819 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
820 m = 0;
822 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
824 * We dont want to read past the end of the userspace
825 * bitmap. We must however ensure the end of the
826 * kernel bitmap is zeroed.
828 if (nr_compat_longs-- > 0) {
829 if (__get_user(um, umask))
830 return -EFAULT;
831 } else {
832 um = 0;
835 umask++;
836 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
838 *mask++ = m;
841 return 0;
844 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
845 unsigned long bitmap_size)
847 int i, j;
848 unsigned long m;
849 compat_ulong_t um;
850 unsigned long nr_compat_longs;
852 /* align bitmap up to nearest compat_long_t boundary */
853 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
855 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
856 return -EFAULT;
858 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
860 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
861 m = *mask++;
863 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
864 um = m;
867 * We dont want to write past the end of the userspace
868 * bitmap.
870 if (nr_compat_longs-- > 0) {
871 if (__put_user(um, umask))
872 return -EFAULT;
875 umask++;
876 m >>= 4*sizeof(um);
877 m >>= 4*sizeof(um);
881 return 0;
884 void
885 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
887 switch (_NSIG_WORDS) {
888 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
889 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
890 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
891 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
894 EXPORT_SYMBOL_GPL(sigset_from_compat);
896 asmlinkage long
897 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
898 struct compat_siginfo __user *uinfo,
899 struct compat_timespec __user *uts, compat_size_t sigsetsize)
901 compat_sigset_t s32;
902 sigset_t s;
903 struct timespec t;
904 siginfo_t info;
905 long ret;
907 if (sigsetsize != sizeof(sigset_t))
908 return -EINVAL;
910 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
911 return -EFAULT;
912 sigset_from_compat(&s, &s32);
914 if (uts) {
915 if (get_compat_timespec(&t, uts))
916 return -EFAULT;
919 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
921 if (ret > 0 && uinfo) {
922 if (copy_siginfo_to_user32(uinfo, &info))
923 ret = -EFAULT;
926 return ret;
930 asmlinkage long
931 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
932 struct compat_siginfo __user *uinfo)
934 siginfo_t info;
936 if (copy_siginfo_from_user32(&info, uinfo))
937 return -EFAULT;
938 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
941 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
943 /* compat_time_t is a 32 bit "long" and needs to get converted. */
945 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
947 compat_time_t i;
948 struct timeval tv;
950 do_gettimeofday(&tv);
951 i = tv.tv_sec;
953 if (tloc) {
954 if (put_user(i,tloc))
955 return -EFAULT;
957 force_successful_syscall_return();
958 return i;
961 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
963 struct timespec tv;
964 int err;
966 if (get_user(tv.tv_sec, tptr))
967 return -EFAULT;
969 tv.tv_nsec = 0;
971 err = security_settime(&tv, NULL);
972 if (err)
973 return err;
975 do_settimeofday(&tv);
976 return 0;
979 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
981 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
982 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
984 sigset_t newset;
985 compat_sigset_t newset32;
987 /* XXX: Don't preclude handling different sized sigset_t's. */
988 if (sigsetsize != sizeof(sigset_t))
989 return -EINVAL;
991 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
992 return -EFAULT;
993 sigset_from_compat(&newset, &newset32);
994 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
996 current->saved_sigmask = current->blocked;
997 set_current_blocked(&newset);
999 current->state = TASK_INTERRUPTIBLE;
1000 schedule();
1001 set_restore_sigmask();
1002 return -ERESTARTNOHAND;
1004 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1006 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1008 struct timex txc;
1009 int err, ret;
1011 err = compat_get_timex(&txc, utp);
1012 if (err)
1013 return err;
1015 ret = do_adjtimex(&txc);
1017 err = compat_put_timex(utp, &txc);
1018 if (err)
1019 return err;
1021 return ret;
1024 #ifdef CONFIG_NUMA
1025 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1026 compat_uptr_t __user *pages32,
1027 const int __user *nodes,
1028 int __user *status,
1029 int flags)
1031 const void __user * __user *pages;
1032 int i;
1034 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1035 for (i = 0; i < nr_pages; i++) {
1036 compat_uptr_t p;
1038 if (get_user(p, pages32 + i) ||
1039 put_user(compat_ptr(p), pages + i))
1040 return -EFAULT;
1042 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1045 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1046 compat_ulong_t maxnode,
1047 const compat_ulong_t __user *old_nodes,
1048 const compat_ulong_t __user *new_nodes)
1050 unsigned long __user *old = NULL;
1051 unsigned long __user *new = NULL;
1052 nodemask_t tmp_mask;
1053 unsigned long nr_bits;
1054 unsigned long size;
1056 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1057 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1058 if (old_nodes) {
1059 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1060 return -EFAULT;
1061 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1062 if (new_nodes)
1063 new = old + size / sizeof(unsigned long);
1064 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1065 return -EFAULT;
1067 if (new_nodes) {
1068 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1069 return -EFAULT;
1070 if (new == NULL)
1071 new = compat_alloc_user_space(size);
1072 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1073 return -EFAULT;
1075 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1077 #endif
1079 struct compat_sysinfo {
1080 s32 uptime;
1081 u32 loads[3];
1082 u32 totalram;
1083 u32 freeram;
1084 u32 sharedram;
1085 u32 bufferram;
1086 u32 totalswap;
1087 u32 freeswap;
1088 u16 procs;
1089 u16 pad;
1090 u32 totalhigh;
1091 u32 freehigh;
1092 u32 mem_unit;
1093 char _f[20-2*sizeof(u32)-sizeof(int)];
1096 asmlinkage long
1097 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1099 struct sysinfo s;
1101 do_sysinfo(&s);
1103 /* Check to see if any memory value is too large for 32-bit and scale
1104 * down if needed
1106 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1107 int bitcount = 0;
1109 while (s.mem_unit < PAGE_SIZE) {
1110 s.mem_unit <<= 1;
1111 bitcount++;
1114 s.totalram >>= bitcount;
1115 s.freeram >>= bitcount;
1116 s.sharedram >>= bitcount;
1117 s.bufferram >>= bitcount;
1118 s.totalswap >>= bitcount;
1119 s.freeswap >>= bitcount;
1120 s.totalhigh >>= bitcount;
1121 s.freehigh >>= bitcount;
1124 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1125 __put_user (s.uptime, &info->uptime) ||
1126 __put_user (s.loads[0], &info->loads[0]) ||
1127 __put_user (s.loads[1], &info->loads[1]) ||
1128 __put_user (s.loads[2], &info->loads[2]) ||
1129 __put_user (s.totalram, &info->totalram) ||
1130 __put_user (s.freeram, &info->freeram) ||
1131 __put_user (s.sharedram, &info->sharedram) ||
1132 __put_user (s.bufferram, &info->bufferram) ||
1133 __put_user (s.totalswap, &info->totalswap) ||
1134 __put_user (s.freeswap, &info->freeswap) ||
1135 __put_user (s.procs, &info->procs) ||
1136 __put_user (s.totalhigh, &info->totalhigh) ||
1137 __put_user (s.freehigh, &info->freehigh) ||
1138 __put_user (s.mem_unit, &info->mem_unit))
1139 return -EFAULT;
1141 return 0;
1145 * Allocate user-space memory for the duration of a single system call,
1146 * in order to marshall parameters inside a compat thunk.
1148 void __user *compat_alloc_user_space(unsigned long len)
1150 void __user *ptr;
1152 /* If len would occupy more than half of the entire compat space... */
1153 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1154 return NULL;
1156 ptr = arch_compat_alloc_user_space(len);
1158 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1159 return NULL;
1161 return ptr;
1163 EXPORT_SYMBOL_GPL(compat_alloc_user_space);