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PCI: centralize the capabilities code in probe.c
[linux.git] / kernel / compat.c
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1da177e4
LT		 1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
1da177e4
LT		 20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
3158e941 23#include <linux/timex.h>
1b2db9fb 24#include <linux/migrate.h>
1711ef38 25#include <linux/posix-timers.h>
1da177e4
LT		 26
27#include <asm/uaccess.h>
1da177e4 28
b418da16
CH		 29/*
30 * Note that the native side is already converted to a timespec, because
31 * that's what we want anyway.
32 */
33static int compat_get_timeval(struct timespec *o,
34 struct compat_timeval __user *i)
35{
36 long usec;
37
38 if (get_user(o->tv_sec, &i->tv_sec) ||
39 get_user(usec, &i->tv_usec))
40 return -EFAULT;
41 o->tv_nsec = usec * 1000;
42 return 0;
43}
44
45static int compat_put_timeval(struct compat_timeval __user *o,
46 struct timeval *i)
47{
48 return (put_user(i->tv_sec, &o->tv_sec) ||
49 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
50}
51
52asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
53 struct timezone __user *tz)
54{
55 if (tv) {
56 struct timeval ktv;
57 do_gettimeofday(&ktv);
58 if (compat_put_timeval(tv, &ktv))
59 return -EFAULT;
60 }
61 if (tz) {
62 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
63 return -EFAULT;
64 }
65
66 return 0;
67}
68
69asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
70 struct timezone __user *tz)
71{
72 struct timespec kts;
73 struct timezone ktz;
74
75 if (tv) {
76 if (compat_get_timeval(&kts, tv))
77 return -EFAULT;
78 }
79 if (tz) {
80 if (copy_from_user(&ktz, tz, sizeof(ktz)))
81 return -EFAULT;
82 }
83
84 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
85}
86
1da177e4
LT		 87int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
88{
89 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
90 __get_user(ts->tv_sec, &cts->tv_sec) ||
91 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
92}
93
94int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
95{
96 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
97 __put_user(ts->tv_sec, &cts->tv_sec) ||
98 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
99}
100
41652937
ON		 101static long compat_nanosleep_restart(struct restart_block *restart)
102{
103 struct compat_timespec __user *rmtp;
104 struct timespec rmt;
105 mm_segment_t oldfs;
106 long ret;
107
029a07e0 108 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 109 oldfs = get_fs();
110 set_fs(KERNEL_DS);
111 ret = hrtimer_nanosleep_restart(restart);
112 set_fs(oldfs);
113
114 if (ret) {
029a07e0 115 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 116
117 if (rmtp && put_compat_timespec(&rmt, rmtp))
118 return -EFAULT;
119 }
120
121 return ret;
122}
123
1da177e4 124asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 125 struct compat_timespec __user *rmtp)
1da177e4 126{
c70878b4 127 struct timespec tu, rmt;
41652937 128 mm_segment_t oldfs;
c70878b4 129 long ret;
1da177e4 130
c70878b4 131 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 132 return -EFAULT;
133
c70878b4 134 if (!timespec_valid(&tu))
1da177e4
LT		 135 return -EINVAL;
136
41652937
ON		 137 oldfs = get_fs();
138 set_fs(KERNEL_DS);
139 ret = hrtimer_nanosleep(&tu,
140 rmtp ? (struct timespec __user *)&rmt : NULL,
141 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
142 set_fs(oldfs);
143
144 if (ret) {
145 struct restart_block *restart
146 = &current_thread_info()->restart_block;
147
148 restart->fn = compat_nanosleep_restart;
029a07e0 149 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 150
41652937 151 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 152 return -EFAULT;
153 }
c70878b4
AB		 154
155 return ret;
1da177e4
LT		 156}
157
158static inline long get_compat_itimerval(struct itimerval *o,
159 struct compat_itimerval __user *i)
160{
161 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
162 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
163 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
164 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
165 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
166}
167
168static inline long put_compat_itimerval(struct compat_itimerval __user *o,
169 struct itimerval *i)
170{
171 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
172 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
173 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
174 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
175 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
176}
177
178asmlinkage long compat_sys_getitimer(int which,
179 struct compat_itimerval __user *it)
180{
181 struct itimerval kit;
182 int error;
183
184 error = do_getitimer(which, &kit);
185 if (!error && put_compat_itimerval(it, &kit))
186 error = -EFAULT;
187 return error;
188}
189
190asmlinkage long compat_sys_setitimer(int which,
191 struct compat_itimerval __user *in,
192 struct compat_itimerval __user *out)
193{
194 struct itimerval kin, kout;
195 int error;
196
197 if (in) {
198 if (get_compat_itimerval(&kin, in))
199 return -EFAULT;
200 } else
201 memset(&kin, 0, sizeof(kin));
202
203 error = do_setitimer(which, &kin, out ? &kout : NULL);
204 if (error || !out)
205 return error;
206 if (put_compat_itimerval(out, &kout))
207 return -EFAULT;
208 return 0;
209}
210
211asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
212{
213 /*
214 * In the SMP world we might just be unlucky and have one of
215 * the times increment as we use it. Since the value is an
216 * atomically safe type this is just fine. Conceptually its
217 * as if the syscall took an instant longer to occur.
218 */
219 if (tbuf) {
220 struct compat_tms tmp;
221 struct task_struct *tsk = current;
222 struct task_struct *t;
223 cputime_t utime, stime, cutime, cstime;
224
225 read_lock(&tasklist_lock);
226 utime = tsk->signal->utime;
227 stime = tsk->signal->stime;
228 t = tsk;
229 do {
230 utime = cputime_add(utime, t->utime);
231 stime = cputime_add(stime, t->stime);
232 t = next_thread(t);
233 } while (t != tsk);
234
235 /*
236 * While we have tasklist_lock read-locked, no dying thread
237 * can be updating current->signal->[us]time. Instead,
238 * we got their counts included in the live thread loop.
239 * However, another thread can come in right now and
240 * do a wait call that updates current->signal->c[us]time.
241 * To make sure we always see that pair updated atomically,
242 * we take the siglock around fetching them.
243 */
244 spin_lock_irq(&tsk->sighand->siglock);
245 cutime = tsk->signal->cutime;
246 cstime = tsk->signal->cstime;
247 spin_unlock_irq(&tsk->sighand->siglock);
248 read_unlock(&tasklist_lock);
249
250 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
251 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
252 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
253 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
254 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
255 return -EFAULT;
256 }
257 return compat_jiffies_to_clock_t(jiffies);
258}
259
260/*
261 * Assumption: old_sigset_t and compat_old_sigset_t are both
262 * types that can be passed to put_user()/get_user().
263 */
264
265asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
266{
267 old_sigset_t s;
268 long ret;
269 mm_segment_t old_fs = get_fs();
270
271 set_fs(KERNEL_DS);
272 ret = sys_sigpending((old_sigset_t __user *) &s);
273 set_fs(old_fs);
274 if (ret == 0)
275 ret = put_user(s, set);
276 return ret;
277}
278
279asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
280 compat_old_sigset_t __user *oset)
281{
282 old_sigset_t s;
283 long ret;
284 mm_segment_t old_fs;
285
286 if (set && get_user(s, set))
287 return -EFAULT;
288 old_fs = get_fs();
289 set_fs(KERNEL_DS);
290 ret = sys_sigprocmask(how,
291 set ? (old_sigset_t __user *) &s : NULL,
292 oset ? (old_sigset_t __user *) &s : NULL);
293 set_fs(old_fs);
294 if (ret == 0)
295 if (oset)
296 ret = put_user(s, oset);
297 return ret;
298}
299
1da177e4
LT		 300asmlinkage long compat_sys_setrlimit(unsigned int resource,
301 struct compat_rlimit __user *rlim)
302{
303 struct rlimit r;
304 int ret;
305 mm_segment_t old_fs = get_fs ();
306
bd3a8492
DW		 307 if (resource >= RLIM_NLIMITS)
308 return -EINVAL;
1da177e4
LT		 309
310 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
311 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
312 __get_user(r.rlim_max, &rlim->rlim_max))
313 return -EFAULT;
314
315 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
316 r.rlim_cur = RLIM_INFINITY;
317 if (r.rlim_max == COMPAT_RLIM_INFINITY)
318 r.rlim_max = RLIM_INFINITY;
319 set_fs(KERNEL_DS);
320 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
321 set_fs(old_fs);
322 return ret;
323}
324
325#ifdef COMPAT_RLIM_OLD_INFINITY
326
327asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
328 struct compat_rlimit __user *rlim)
329{
330 struct rlimit r;
331 int ret;
332 mm_segment_t old_fs = get_fs();
333
334 set_fs(KERNEL_DS);
335 ret = sys_old_getrlimit(resource, &r);
336 set_fs(old_fs);
337
338 if (!ret) {
339 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
340 r.rlim_cur = COMPAT_RLIM_INFINITY;
341 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
342 r.rlim_max = COMPAT_RLIM_INFINITY;
343
344 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
345 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
346 __put_user(r.rlim_max, &rlim->rlim_max))
347 return -EFAULT;
348 }
349 return ret;
350}
351
352#endif
353
354asmlinkage long compat_sys_getrlimit (unsigned int resource,
355 struct compat_rlimit __user *rlim)
356{
357 struct rlimit r;
358 int ret;
359 mm_segment_t old_fs = get_fs();
360
361 set_fs(KERNEL_DS);
362 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
363 set_fs(old_fs);
364 if (!ret) {
365 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
366 r.rlim_cur = COMPAT_RLIM_INFINITY;
367 if (r.rlim_max > COMPAT_RLIM_INFINITY)
368 r.rlim_max = COMPAT_RLIM_INFINITY;
369
370 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
371 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
372 __put_user(r.rlim_max, &rlim->rlim_max))
373 return -EFAULT;
374 }
375 return ret;
376}
377
378int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
379{
380 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
381 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
382 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
383 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
384 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
385 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
386 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
387 __put_user(r->ru_idrss, &ru->ru_idrss) ||
388 __put_user(r->ru_isrss, &ru->ru_isrss) ||
389 __put_user(r->ru_minflt, &ru->ru_minflt) ||
390 __put_user(r->ru_majflt, &ru->ru_majflt) ||
391 __put_user(r->ru_nswap, &ru->ru_nswap) ||
392 __put_user(r->ru_inblock, &ru->ru_inblock) ||
393 __put_user(r->ru_oublock, &ru->ru_oublock) ||
394 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
395 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
396 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
397 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
398 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
399 return -EFAULT;
400 return 0;
401}
402
403asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
404{
405 struct rusage r;
406 int ret;
407 mm_segment_t old_fs = get_fs();
408
409 set_fs(KERNEL_DS);
410 ret = sys_getrusage(who, (struct rusage __user *) &r);
411 set_fs(old_fs);
412
413 if (ret)
414 return ret;
415
416 if (put_compat_rusage(&r, ru))
417 return -EFAULT;
418
419 return 0;
420}
421
422asmlinkage long
423compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
424 struct compat_rusage __user *ru)
425{
426 if (!ru) {
427 return sys_wait4(pid, stat_addr, options, NULL);
428 } else {
429 struct rusage r;
430 int ret;
431 unsigned int status;
432 mm_segment_t old_fs = get_fs();
433
434 set_fs (KERNEL_DS);
435 ret = sys_wait4(pid,
436 (stat_addr ?
437 (unsigned int __user *) &status : NULL),
438 options, (struct rusage __user *) &r);
439 set_fs (old_fs);
440
441 if (ret > 0) {
442 if (put_compat_rusage(&r, ru))
443 return -EFAULT;
444 if (stat_addr && put_user(status, stat_addr))
445 return -EFAULT;
446 }
447 return ret;
448 }
449}
450
451asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
452 struct compat_siginfo __user *uinfo, int options,
453 struct compat_rusage __user *uru)
454{
455 siginfo_t info;
456 struct rusage ru;
457 long ret;
458 mm_segment_t old_fs = get_fs();
459
460 memset(&info, 0, sizeof(info));
461
462 set_fs(KERNEL_DS);
463 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
464 uru ? (struct rusage __user *)&ru : NULL);
465 set_fs(old_fs);
466
467 if ((ret < 0) || (info.si_signo == 0))
468 return ret;
469
470 if (uru) {
471 ret = put_compat_rusage(&ru, uru);
472 if (ret)
473 return ret;
474 }
475
476 BUG_ON(info.si_code & __SI_MASK);
477 info.si_code |= __SI_CHLD;
478 return copy_siginfo_to_user32(uinfo, &info);
479}
480
481static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
482 unsigned len, cpumask_t *new_mask)
483{
484 unsigned long *k;
485
486 if (len < sizeof(cpumask_t))
487 memset(new_mask, 0, sizeof(cpumask_t));
488 else if (len > sizeof(cpumask_t))
489 len = sizeof(cpumask_t);
490
491 k = cpus_addr(*new_mask);
492 return compat_get_bitmap(k, user_mask_ptr, len * 8);
493}
494
495asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
496 unsigned int len,
497 compat_ulong_t __user *user_mask_ptr)
498{
499 cpumask_t new_mask;
500 int retval;
501
502 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
503 if (retval)
504 return retval;
505
b53e921b 506 return sched_setaffinity(pid, &new_mask);
1da177e4
LT		 507}
508
509asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
510 compat_ulong_t __user *user_mask_ptr)
511{
512 int ret;
513 cpumask_t mask;
514 unsigned long *k;
515 unsigned int min_length = sizeof(cpumask_t);
516
517 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
518 min_length = sizeof(compat_ulong_t);
519
520 if (len < min_length)
521 return -EINVAL;
522
523 ret = sched_getaffinity(pid, &mask);
524 if (ret < 0)
525 return ret;
526
527 k = cpus_addr(mask);
528 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
529 if (ret)
530 return ret;
531
532 return min_length;
533}
534
83f5d126
DL		 535int get_compat_itimerspec(struct itimerspec *dst,
536 const struct compat_itimerspec __user *src)
bd3a8492 537{
1da177e4
LT		 538 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
539 get_compat_timespec(&dst->it_value, &src->it_value))
540 return -EFAULT;
541 return 0;
bd3a8492 542}
1da177e4 543
83f5d126
DL		 544int put_compat_itimerspec(struct compat_itimerspec __user *dst,
545 const struct itimerspec *src)
bd3a8492 546{
1da177e4
LT		 547 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
548 put_compat_timespec(&src->it_value, &dst->it_value))
549 return -EFAULT;
550 return 0;
bd3a8492 551}
1da177e4 552
3a0f69d5
CH		 553long compat_sys_timer_create(clockid_t which_clock,
554 struct compat_sigevent __user *timer_event_spec,
555 timer_t __user *created_timer_id)
556{
557 struct sigevent __user *event = NULL;
558
559 if (timer_event_spec) {
560 struct sigevent kevent;
561
562 event = compat_alloc_user_space(sizeof(*event));
563 if (get_compat_sigevent(&kevent, timer_event_spec) ||
564 copy_to_user(event, &kevent, sizeof(*event)))
565 return -EFAULT;
566 }
567
568 return sys_timer_create(which_clock, event, created_timer_id);
569}
570
1da177e4 571long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 572 struct compat_itimerspec __user *new,
1da177e4 573 struct compat_itimerspec __user *old)
bd3a8492 574{
1da177e4
LT		 575 long err;
576 mm_segment_t oldfs;
577 struct itimerspec newts, oldts;
578
579 if (!new)
580 return -EINVAL;
581 if (get_compat_itimerspec(&newts, new))
bd3a8492 582 return -EFAULT;
1da177e4
LT		 583 oldfs = get_fs();
584 set_fs(KERNEL_DS);
585 err = sys_timer_settime(timer_id, flags,
586 (struct itimerspec __user *) &newts,
587 (struct itimerspec __user *) &oldts);
bd3a8492 588 set_fs(oldfs);
1da177e4
LT		 589 if (!err && old && put_compat_itimerspec(old, &oldts))
590 return -EFAULT;
591 return err;
bd3a8492 592}
1da177e4
LT		 593
594long compat_sys_timer_gettime(timer_t timer_id,
595 struct compat_itimerspec __user *setting)
bd3a8492 596{
1da177e4
LT		 597 long err;
598 mm_segment_t oldfs;
bd3a8492 599 struct itimerspec ts;
1da177e4
LT		 600
601 oldfs = get_fs();
602 set_fs(KERNEL_DS);
603 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 604 (struct itimerspec __user *) &ts);
605 set_fs(oldfs);
1da177e4
LT		 606 if (!err && put_compat_itimerspec(setting, &ts))
607 return -EFAULT;
608 return err;
bd3a8492 609}
1da177e4
LT		 610
611long compat_sys_clock_settime(clockid_t which_clock,
612 struct compat_timespec __user *tp)
613{
614 long err;
615 mm_segment_t oldfs;
bd3a8492 616 struct timespec ts;
1da177e4
LT		 617
618 if (get_compat_timespec(&ts, tp))
bd3a8492 619 return -EFAULT;
1da177e4 620 oldfs = get_fs();
bd3a8492 621 set_fs(KERNEL_DS);
1da177e4
LT		 622 err = sys_clock_settime(which_clock,
623 (struct timespec __user *) &ts);
624 set_fs(oldfs);
625 return err;
bd3a8492 626}
1da177e4
LT		 627
628long compat_sys_clock_gettime(clockid_t which_clock,
629 struct compat_timespec __user *tp)
630{
631 long err;
632 mm_segment_t oldfs;
bd3a8492 633 struct timespec ts;
1da177e4
LT		 634
635 oldfs = get_fs();
636 set_fs(KERNEL_DS);
637 err = sys_clock_gettime(which_clock,
638 (struct timespec __user *) &ts);
639 set_fs(oldfs);
640 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 641 return -EFAULT;
1da177e4 642 return err;
bd3a8492 643}
1da177e4
LT		 644
645long compat_sys_clock_getres(clockid_t which_clock,
646 struct compat_timespec __user *tp)
647{
648 long err;
649 mm_segment_t oldfs;
bd3a8492 650 struct timespec ts;
1da177e4
LT		 651
652 oldfs = get_fs();
653 set_fs(KERNEL_DS);
654 err = sys_clock_getres(which_clock,
655 (struct timespec __user *) &ts);
656 set_fs(oldfs);
657 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 658 return -EFAULT;
1da177e4 659 return err;
bd3a8492 660}
1da177e4 661
1711ef38
TA		 662static long compat_clock_nanosleep_restart(struct restart_block *restart)
663{
664 long err;
665 mm_segment_t oldfs;
666 struct timespec tu;
029a07e0 667 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 668
029a07e0 669 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 670 oldfs = get_fs();
671 set_fs(KERNEL_DS);
672 err = clock_nanosleep_restart(restart);
673 set_fs(oldfs);
674
675 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
676 put_compat_timespec(&tu, rmtp))
677 return -EFAULT;
678
679 if (err == -ERESTART_RESTARTBLOCK) {
680 restart->fn = compat_clock_nanosleep_restart;
029a07e0 681 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 682 }
683 return err;
684}
685
1da177e4
LT		 686long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
687 struct compat_timespec __user *rqtp,
688 struct compat_timespec __user *rmtp)
689{
690 long err;
691 mm_segment_t oldfs;
bd3a8492 692 struct timespec in, out;
1711ef38 693 struct restart_block *restart;
1da177e4 694
bd3a8492 695 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 696 return -EFAULT;
697
698 oldfs = get_fs();
699 set_fs(KERNEL_DS);
700 err = sys_clock_nanosleep(which_clock, flags,
701 (struct timespec __user *) &in,
702 (struct timespec __user *) &out);
703 set_fs(oldfs);
1711ef38 704
1da177e4
LT		 705 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
706 put_compat_timespec(&out, rmtp))
707 return -EFAULT;
1711ef38
TA		 708
709 if (err == -ERESTART_RESTARTBLOCK) {
710 restart = &current_thread_info()->restart_block;
711 restart->fn = compat_clock_nanosleep_restart;
029a07e0 712 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 713 }
bd3a8492
DW		 714 return err;
715}
1da177e4
LT		 716
717/*
718 * We currently only need the following fields from the sigevent
719 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
720 * sigev_notify_thread_id). The others are handled in user mode.
721 * We also assume that copying sigev_value.sival_int is sufficient
722 * to keep all the bits of sigev_value.sival_ptr intact.
723 */
724int get_compat_sigevent(struct sigevent *event,
725 const struct compat_sigevent __user *u_event)
726{
51410d3c 727 memset(event, 0, sizeof(*event));
1da177e4
LT		 728 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
729 __get_user(event->sigev_value.sival_int,
730 &u_event->sigev_value.sival_int) ||
731 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
732 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
733 __get_user(event->sigev_notify_thread_id,
734 &u_event->sigev_notify_thread_id))
735 ? -EFAULT : 0;
736}
737
5fa3839a 738long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 739 unsigned long bitmap_size)
740{
741 int i, j;
742 unsigned long m;
743 compat_ulong_t um;
744 unsigned long nr_compat_longs;
745
746 /* align bitmap up to nearest compat_long_t boundary */
747 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
748
749 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
750 return -EFAULT;
751
752 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
753
754 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
755 m = 0;
756
757 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
758 /*
759 * We dont want to read past the end of the userspace
760 * bitmap. We must however ensure the end of the
761 * kernel bitmap is zeroed.
762 */
763 if (nr_compat_longs-- > 0) {
764 if (__get_user(um, umask))
765 return -EFAULT;
766 } else {
767 um = 0;
768 }
769
770 umask++;
771 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
772 }
773 *mask++ = m;
774 }
775
776 return 0;
777}
778
779long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
780 unsigned long bitmap_size)
781{
782 int i, j;
783 unsigned long m;
784 compat_ulong_t um;
785 unsigned long nr_compat_longs;
786
787 /* align bitmap up to nearest compat_long_t boundary */
788 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
789
790 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
791 return -EFAULT;
792
793 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
794
795 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
796 m = *mask++;
797
798 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
799 um = m;
800
801 /*
802 * We dont want to write past the end of the userspace
803 * bitmap.
804 */
805 if (nr_compat_longs-- > 0) {
806 if (__put_user(um, umask))
807 return -EFAULT;
808 }
809
810 umask++;
811 m >>= 4*sizeof(um);
812 m >>= 4*sizeof(um);
813 }
814 }
815
816 return 0;
817}
818
819void
820sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
821{
822 switch (_NSIG_WORDS) {
1da177e4
LT		 823 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
824 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
825 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
826 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 827 }
828}
829
830asmlinkage long
831compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
832 struct compat_siginfo __user *uinfo,
833 struct compat_timespec __user *uts, compat_size_t sigsetsize)
834{
835 compat_sigset_t s32;
836 sigset_t s;
837 int sig;
838 struct timespec t;
839 siginfo_t info;
840 long ret, timeout = 0;
841
842 if (sigsetsize != sizeof(sigset_t))
843 return -EINVAL;
844
845 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
846 return -EFAULT;
847 sigset_from_compat(&s, &s32);
848 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
849 signotset(&s);
850
851 if (uts) {
852 if (get_compat_timespec (&t, uts))
853 return -EFAULT;
854 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
855 || t.tv_sec < 0)
856 return -EINVAL;
857 }
858
859 spin_lock_irq(&current->sighand->siglock);
860 sig = dequeue_signal(current, &s, &info);
861 if (!sig) {
862 timeout = MAX_SCHEDULE_TIMEOUT;
863 if (uts)
864 timeout = timespec_to_jiffies(&t)
865 +(t.tv_sec || t.tv_nsec);
866 if (timeout) {
867 current->real_blocked = current->blocked;
868 sigandsets(&current->blocked, &current->blocked, &s);
869
870 recalc_sigpending();
871 spin_unlock_irq(&current->sighand->siglock);
872
75bcc8c5 873 timeout = schedule_timeout_interruptible(timeout);
1da177e4
LT		 874
875 spin_lock_irq(&current->sighand->siglock);
876 sig = dequeue_signal(current, &s, &info);
877 current->blocked = current->real_blocked;
878 siginitset(&current->real_blocked, 0);
879 recalc_sigpending();
880 }
881 }
882 spin_unlock_irq(&current->sighand->siglock);
883
884 if (sig) {
885 ret = sig;
886 if (uinfo) {
887 if (copy_siginfo_to_user32(uinfo, &info))
888 ret = -EFAULT;
889 }
890 }else {
891 ret = timeout?-EINTR:-EAGAIN;
892 }
893 return ret;
894
895}
896
897#ifdef __ARCH_WANT_COMPAT_SYS_TIME
898
899/* compat_time_t is a 32 bit "long" and needs to get converted. */
900
901asmlinkage long compat_sys_time(compat_time_t __user * tloc)
902{
903 compat_time_t i;
904 struct timeval tv;
905
906 do_gettimeofday(&tv);
907 i = tv.tv_sec;
908
909 if (tloc) {
910 if (put_user(i,tloc))
911 i = -EFAULT;
912 }
913 return i;
914}
915
916asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
917{
918 struct timespec tv;
919 int err;
920
921 if (get_user(tv.tv_sec, tptr))
922 return -EFAULT;
923
924 tv.tv_nsec = 0;
925
926 err = security_settime(&tv, NULL);
927 if (err)
928 return err;
929
930 do_settimeofday(&tv);
931 return 0;
932}
933
934#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 935
936#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
937asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
938{
939 sigset_t newset;
940 compat_sigset_t newset32;
941
942 /* XXX: Don't preclude handling different sized sigset_t's. */
943 if (sigsetsize != sizeof(sigset_t))
944 return -EINVAL;
945
946 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
947 return -EFAULT;
948 sigset_from_compat(&newset, &newset32);
949 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
950
951 spin_lock_irq(&current->sighand->siglock);
952 current->saved_sigmask = current->blocked;
953 current->blocked = newset;
954 recalc_sigpending();
955 spin_unlock_irq(&current->sighand->siglock);
956
957 current->state = TASK_INTERRUPTIBLE;
958 schedule();
4e4c22c7 959 set_restore_sigmask();
150256d8
DW		 960 return -ERESTARTNOHAND;
961}
962#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 963
964asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
965{
966 struct timex txc;
967 int ret;
968
969 memset(&txc, 0, sizeof(struct timex));
970
971 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
972 __get_user(txc.modes, &utp->modes) ||
973 __get_user(txc.offset, &utp->offset) ||
974 __get_user(txc.freq, &utp->freq) ||
975 __get_user(txc.maxerror, &utp->maxerror) ||
976 __get_user(txc.esterror, &utp->esterror) ||
977 __get_user(txc.status, &utp->status) ||
978 __get_user(txc.constant, &utp->constant) ||
979 __get_user(txc.precision, &utp->precision) ||
980 __get_user(txc.tolerance, &utp->tolerance) ||
981 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
982 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
983 __get_user(txc.tick, &utp->tick) ||
984 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
985 __get_user(txc.jitter, &utp->jitter) ||
986 __get_user(txc.shift, &utp->shift) ||
987 __get_user(txc.stabil, &utp->stabil) ||
988 __get_user(txc.jitcnt, &utp->jitcnt) ||
989 __get_user(txc.calcnt, &utp->calcnt) ||
990 __get_user(txc.errcnt, &utp->errcnt) ||
991 __get_user(txc.stbcnt, &utp->stbcnt))
992 return -EFAULT;
993
994 ret = do_adjtimex(&txc);
995
996 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
997 __put_user(txc.modes, &utp->modes) ||
998 __put_user(txc.offset, &utp->offset) ||
999 __put_user(txc.freq, &utp->freq) ||
1000 __put_user(txc.maxerror, &utp->maxerror) ||
1001 __put_user(txc.esterror, &utp->esterror) ||
1002 __put_user(txc.status, &utp->status) ||
1003 __put_user(txc.constant, &utp->constant) ||
1004 __put_user(txc.precision, &utp->precision) ||
1005 __put_user(txc.tolerance, &utp->tolerance) ||
1006 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1007 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1008 __put_user(txc.tick, &utp->tick) ||
1009 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1010 __put_user(txc.jitter, &utp->jitter) ||
1011 __put_user(txc.shift, &utp->shift) ||
1012 __put_user(txc.stabil, &utp->stabil) ||
1013 __put_user(txc.jitcnt, &utp->jitcnt) ||
1014 __put_user(txc.calcnt, &utp->calcnt) ||
1015 __put_user(txc.errcnt, &utp->errcnt) ||
153b5d05
RZ		 1016 __put_user(txc.stbcnt, &utp->stbcnt) ||
1017 __put_user(txc.tai, &utp->tai))
3158e941
SR		 1018 ret = -EFAULT;
1019
1020 return ret;
1021}
1b2db9fb
CL		 1022
1023#ifdef CONFIG_NUMA
1024asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1025 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1026 const int __user *nodes,
1027 int __user *status,
1028 int flags)
1029{
1030 const void __user * __user *pages;
1031 int i;
1032
1033 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034 for (i = 0; i < nr_pages; i++) {
1035 compat_uptr_t p;
1036
9216dfad 1037 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1038 put_user(compat_ptr(p), pages + i))
1039 return -EFAULT;
1040 }
1041 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042}
3fd59397
SR		 1043
1044asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045 compat_ulong_t maxnode,
1046 const compat_ulong_t __user *old_nodes,
1047 const compat_ulong_t __user *new_nodes)
1048{
1049 unsigned long __user *old = NULL;
1050 unsigned long __user *new = NULL;
1051 nodemask_t tmp_mask;
1052 unsigned long nr_bits;
1053 unsigned long size;
1054
1055 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057 if (old_nodes) {
1058 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059 return -EFAULT;
1060 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061 if (new_nodes)
1062 new = old + size / sizeof(unsigned long);
1063 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064 return -EFAULT;
1065 }
1066 if (new_nodes) {
1067 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068 return -EFAULT;
1069 if (new == NULL)
1070 new = compat_alloc_user_space(size);
1071 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072 return -EFAULT;
1073 }
1074 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075}
1b2db9fb 1076#endif
d4d23add
KM		 1077
1078struct compat_sysinfo {
1079 s32 uptime;
1080 u32 loads[3];
1081 u32 totalram;
1082 u32 freeram;
1083 u32 sharedram;
1084 u32 bufferram;
1085 u32 totalswap;
1086 u32 freeswap;
1087 u16 procs;
1088 u16 pad;
1089 u32 totalhigh;
1090 u32 freehigh;
1091 u32 mem_unit;
1092 char _f[20-2*sizeof(u32)-sizeof(int)];
1093};
1094
1095asmlinkage long
1096compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097{
1098 struct sysinfo s;
1099
1100 do_sysinfo(&s);
1101
1102 /* Check to see if any memory value is too large for 32-bit and scale
1103 * down if needed
1104 */
1105 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106 int bitcount = 0;
1107
1108 while (s.mem_unit < PAGE_SIZE) {
1109 s.mem_unit <<= 1;
1110 bitcount++;
1111 }
1112
1113 s.totalram >>= bitcount;
1114 s.freeram >>= bitcount;
1115 s.sharedram >>= bitcount;
1116 s.bufferram >>= bitcount;
1117 s.totalswap >>= bitcount;
1118 s.freeswap >>= bitcount;
1119 s.totalhigh >>= bitcount;
1120 s.freehigh >>= bitcount;
1121 }
1122
1123 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124 __put_user (s.uptime, &info->uptime) ||
1125 __put_user (s.loads[0], &info->loads[0]) ||
1126 __put_user (s.loads[1], &info->loads[1]) ||
1127 __put_user (s.loads[2], &info->loads[2]) ||
1128 __put_user (s.totalram, &info->totalram) ||
1129 __put_user (s.freeram, &info->freeram) ||
1130 __put_user (s.sharedram, &info->sharedram) ||
1131 __put_user (s.bufferram, &info->bufferram) ||
1132 __put_user (s.totalswap, &info->totalswap) ||
1133 __put_user (s.freeswap, &info->freeswap) ||
1134 __put_user (s.procs, &info->procs) ||
1135 __put_user (s.totalhigh, &info->totalhigh) ||
1136 __put_user (s.freehigh, &info->freehigh) ||
1137 __put_user (s.mem_unit, &info->mem_unit))
1138 return -EFAULT;
1139
1140 return 0;
1141}
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