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[linux.git] / kernel / compat.c
CommitLineData
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>
f06febc9 26#include <linux/times.h>
1da177e4
LT		 27
28#include <asm/uaccess.h>
1da177e4 29
b418da16
CH		 30/*
31 * Note that the native side is already converted to a timespec, because
32 * that's what we want anyway.
33 */
34static int compat_get_timeval(struct timespec *o,
35 struct compat_timeval __user *i)
36{
37 long usec;
38
39 if (get_user(o->tv_sec, &i->tv_sec) ||
40 get_user(usec, &i->tv_usec))
41 return -EFAULT;
42 o->tv_nsec = usec * 1000;
43 return 0;
44}
45
46static int compat_put_timeval(struct compat_timeval __user *o,
47 struct timeval *i)
48{
49 return (put_user(i->tv_sec, &o->tv_sec) ||
50 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
51}
52
53asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
54 struct timezone __user *tz)
55{
56 if (tv) {
57 struct timeval ktv;
58 do_gettimeofday(&ktv);
59 if (compat_put_timeval(tv, &ktv))
60 return -EFAULT;
61 }
62 if (tz) {
63 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
64 return -EFAULT;
65 }
66
67 return 0;
68}
69
70asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
71 struct timezone __user *tz)
72{
73 struct timespec kts;
74 struct timezone ktz;
75
76 if (tv) {
77 if (compat_get_timeval(&kts, tv))
78 return -EFAULT;
79 }
80 if (tz) {
81 if (copy_from_user(&ktz, tz, sizeof(ktz)))
82 return -EFAULT;
83 }
84
85 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
86}
87
1da177e4
LT		 88int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
89{
90 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
91 __get_user(ts->tv_sec, &cts->tv_sec) ||
92 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
93}
94
95int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
96{
97 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
98 __put_user(ts->tv_sec, &cts->tv_sec) ||
99 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
100}
101
41652937
ON		 102static long compat_nanosleep_restart(struct restart_block *restart)
103{
104 struct compat_timespec __user *rmtp;
105 struct timespec rmt;
106 mm_segment_t oldfs;
107 long ret;
108
029a07e0 109 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 110 oldfs = get_fs();
111 set_fs(KERNEL_DS);
112 ret = hrtimer_nanosleep_restart(restart);
113 set_fs(oldfs);
114
115 if (ret) {
029a07e0 116 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 117
118 if (rmtp && put_compat_timespec(&rmt, rmtp))
119 return -EFAULT;
120 }
121
122 return ret;
123}
124
1da177e4 125asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 126 struct compat_timespec __user *rmtp)
1da177e4 127{
c70878b4 128 struct timespec tu, rmt;
41652937 129 mm_segment_t oldfs;
c70878b4 130 long ret;
1da177e4 131
c70878b4 132 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 133 return -EFAULT;
134
c70878b4 135 if (!timespec_valid(&tu))
1da177e4
LT		 136 return -EINVAL;
137
41652937
ON		 138 oldfs = get_fs();
139 set_fs(KERNEL_DS);
140 ret = hrtimer_nanosleep(&tu,
141 rmtp ? (struct timespec __user *)&rmt : NULL,
142 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
143 set_fs(oldfs);
144
145 if (ret) {
146 struct restart_block *restart
147 = &current_thread_info()->restart_block;
148
149 restart->fn = compat_nanosleep_restart;
029a07e0 150 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 151
41652937 152 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 153 return -EFAULT;
154 }
c70878b4
AB		 155
156 return ret;
1da177e4
LT		 157}
158
159static inline long get_compat_itimerval(struct itimerval *o,
160 struct compat_itimerval __user *i)
161{
162 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
163 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
164 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
165 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
166 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
167}
168
169static inline long put_compat_itimerval(struct compat_itimerval __user *o,
170 struct itimerval *i)
171{
172 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
173 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
174 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
175 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
176 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
177}
178
179asmlinkage long compat_sys_getitimer(int which,
180 struct compat_itimerval __user *it)
181{
182 struct itimerval kit;
183 int error;
184
185 error = do_getitimer(which, &kit);
186 if (!error && put_compat_itimerval(it, &kit))
187 error = -EFAULT;
188 return error;
189}
190
191asmlinkage long compat_sys_setitimer(int which,
192 struct compat_itimerval __user *in,
193 struct compat_itimerval __user *out)
194{
195 struct itimerval kin, kout;
196 int error;
197
198 if (in) {
199 if (get_compat_itimerval(&kin, in))
200 return -EFAULT;
201 } else
202 memset(&kin, 0, sizeof(kin));
203
204 error = do_setitimer(which, &kin, out ? &kout : NULL);
205 if (error || !out)
206 return error;
207 if (put_compat_itimerval(out, &kout))
208 return -EFAULT;
209 return 0;
210}
211
f06febc9
FM		 212static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
213{
214 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
215}
216
1da177e4
LT		 217asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
218{
1da177e4 219 if (tbuf) {
f06febc9 220 struct tms tms;
1da177e4 221 struct compat_tms tmp;
f06febc9
FM		 222
223 do_sys_times(&tms);
224 /* Convert our struct tms to the compat version. */
225 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
226 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
227 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
228 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 229 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
230 return -EFAULT;
231 }
232 return compat_jiffies_to_clock_t(jiffies);
233}
234
235/*
236 * Assumption: old_sigset_t and compat_old_sigset_t are both
237 * types that can be passed to put_user()/get_user().
238 */
239
240asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
241{
242 old_sigset_t s;
243 long ret;
244 mm_segment_t old_fs = get_fs();
245
246 set_fs(KERNEL_DS);
247 ret = sys_sigpending((old_sigset_t __user *) &s);
248 set_fs(old_fs);
249 if (ret == 0)
250 ret = put_user(s, set);
251 return ret;
252}
253
254asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
255 compat_old_sigset_t __user *oset)
256{
257 old_sigset_t s;
258 long ret;
259 mm_segment_t old_fs;
260
261 if (set && get_user(s, set))
262 return -EFAULT;
263 old_fs = get_fs();
264 set_fs(KERNEL_DS);
265 ret = sys_sigprocmask(how,
266 set ? (old_sigset_t __user *) &s : NULL,
267 oset ? (old_sigset_t __user *) &s : NULL);
268 set_fs(old_fs);
269 if (ret == 0)
270 if (oset)
271 ret = put_user(s, oset);
272 return ret;
273}
274
1da177e4
LT		 275asmlinkage long compat_sys_setrlimit(unsigned int resource,
276 struct compat_rlimit __user *rlim)
277{
278 struct rlimit r;
279 int ret;
280 mm_segment_t old_fs = get_fs ();
281
bd3a8492
DW		 282 if (resource >= RLIM_NLIMITS)
283 return -EINVAL;
1da177e4
LT		 284
285 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
286 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
287 __get_user(r.rlim_max, &rlim->rlim_max))
288 return -EFAULT;
289
290 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
291 r.rlim_cur = RLIM_INFINITY;
292 if (r.rlim_max == COMPAT_RLIM_INFINITY)
293 r.rlim_max = RLIM_INFINITY;
294 set_fs(KERNEL_DS);
295 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
296 set_fs(old_fs);
297 return ret;
298}
299
300#ifdef COMPAT_RLIM_OLD_INFINITY
301
302asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
303 struct compat_rlimit __user *rlim)
304{
305 struct rlimit r;
306 int ret;
307 mm_segment_t old_fs = get_fs();
308
309 set_fs(KERNEL_DS);
310 ret = sys_old_getrlimit(resource, &r);
311 set_fs(old_fs);
312
313 if (!ret) {
314 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
315 r.rlim_cur = COMPAT_RLIM_INFINITY;
316 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
317 r.rlim_max = COMPAT_RLIM_INFINITY;
318
319 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
320 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
321 __put_user(r.rlim_max, &rlim->rlim_max))
322 return -EFAULT;
323 }
324 return ret;
325}
326
327#endif
328
329asmlinkage long compat_sys_getrlimit (unsigned int resource,
330 struct compat_rlimit __user *rlim)
331{
332 struct rlimit r;
333 int ret;
334 mm_segment_t old_fs = get_fs();
335
336 set_fs(KERNEL_DS);
337 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
338 set_fs(old_fs);
339 if (!ret) {
340 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
341 r.rlim_cur = COMPAT_RLIM_INFINITY;
342 if (r.rlim_max > COMPAT_RLIM_INFINITY)
343 r.rlim_max = COMPAT_RLIM_INFINITY;
344
345 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
346 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
347 __put_user(r.rlim_max, &rlim->rlim_max))
348 return -EFAULT;
349 }
350 return ret;
351}
352
353int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
354{
355 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
356 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
357 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
358 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
359 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
360 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
361 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
362 __put_user(r->ru_idrss, &ru->ru_idrss) ||
363 __put_user(r->ru_isrss, &ru->ru_isrss) ||
364 __put_user(r->ru_minflt, &ru->ru_minflt) ||
365 __put_user(r->ru_majflt, &ru->ru_majflt) ||
366 __put_user(r->ru_nswap, &ru->ru_nswap) ||
367 __put_user(r->ru_inblock, &ru->ru_inblock) ||
368 __put_user(r->ru_oublock, &ru->ru_oublock) ||
369 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
370 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
371 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
372 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
373 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
374 return -EFAULT;
375 return 0;
376}
377
378asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
379{
380 struct rusage r;
381 int ret;
382 mm_segment_t old_fs = get_fs();
383
384 set_fs(KERNEL_DS);
385 ret = sys_getrusage(who, (struct rusage __user *) &r);
386 set_fs(old_fs);
387
388 if (ret)
389 return ret;
390
391 if (put_compat_rusage(&r, ru))
392 return -EFAULT;
393
394 return 0;
395}
396
397asmlinkage long
398compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
399 struct compat_rusage __user *ru)
400{
401 if (!ru) {
402 return sys_wait4(pid, stat_addr, options, NULL);
403 } else {
404 struct rusage r;
405 int ret;
406 unsigned int status;
407 mm_segment_t old_fs = get_fs();
408
409 set_fs (KERNEL_DS);
410 ret = sys_wait4(pid,
411 (stat_addr ?
412 (unsigned int __user *) &status : NULL),
413 options, (struct rusage __user *) &r);
414 set_fs (old_fs);
415
416 if (ret > 0) {
417 if (put_compat_rusage(&r, ru))
418 return -EFAULT;
419 if (stat_addr && put_user(status, stat_addr))
420 return -EFAULT;
421 }
422 return ret;
423 }
424}
425
426asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
427 struct compat_siginfo __user *uinfo, int options,
428 struct compat_rusage __user *uru)
429{
430 siginfo_t info;
431 struct rusage ru;
432 long ret;
433 mm_segment_t old_fs = get_fs();
434
435 memset(&info, 0, sizeof(info));
436
437 set_fs(KERNEL_DS);
438 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
439 uru ? (struct rusage __user *)&ru : NULL);
440 set_fs(old_fs);
441
442 if ((ret < 0) || (info.si_signo == 0))
443 return ret;
444
445 if (uru) {
446 ret = put_compat_rusage(&ru, uru);
447 if (ret)
448 return ret;
449 }
450
451 BUG_ON(info.si_code & __SI_MASK);
452 info.si_code |= __SI_CHLD;
453 return copy_siginfo_to_user32(uinfo, &info);
454}
455
456static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
457 unsigned len, cpumask_t *new_mask)
458{
459 unsigned long *k;
460
461 if (len < sizeof(cpumask_t))
462 memset(new_mask, 0, sizeof(cpumask_t));
463 else if (len > sizeof(cpumask_t))
464 len = sizeof(cpumask_t);
465
466 k = cpus_addr(*new_mask);
467 return compat_get_bitmap(k, user_mask_ptr, len * 8);
468}
469
470asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
471 unsigned int len,
472 compat_ulong_t __user *user_mask_ptr)
473{
474 cpumask_t new_mask;
475 int retval;
476
477 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
478 if (retval)
479 return retval;
480
b53e921b 481 return sched_setaffinity(pid, &new_mask);
1da177e4
LT		 482}
483
484asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
485 compat_ulong_t __user *user_mask_ptr)
486{
487 int ret;
488 cpumask_t mask;
489 unsigned long *k;
490 unsigned int min_length = sizeof(cpumask_t);
491
492 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
493 min_length = sizeof(compat_ulong_t);
494
495 if (len < min_length)
496 return -EINVAL;
497
498 ret = sched_getaffinity(pid, &mask);
499 if (ret < 0)
500 return ret;
501
502 k = cpus_addr(mask);
503 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
504 if (ret)
505 return ret;
506
507 return min_length;
508}
509
83f5d126
DL		 510int get_compat_itimerspec(struct itimerspec *dst,
511 const struct compat_itimerspec __user *src)
bd3a8492 512{
1da177e4
LT		 513 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
514 get_compat_timespec(&dst->it_value, &src->it_value))
515 return -EFAULT;
516 return 0;
bd3a8492 517}
1da177e4 518
83f5d126
DL		 519int put_compat_itimerspec(struct compat_itimerspec __user *dst,
520 const struct itimerspec *src)
bd3a8492 521{
1da177e4
LT		 522 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
523 put_compat_timespec(&src->it_value, &dst->it_value))
524 return -EFAULT;
525 return 0;
bd3a8492 526}
1da177e4 527
3a0f69d5
CH		 528long compat_sys_timer_create(clockid_t which_clock,
529 struct compat_sigevent __user *timer_event_spec,
530 timer_t __user *created_timer_id)
531{
532 struct sigevent __user *event = NULL;
533
534 if (timer_event_spec) {
535 struct sigevent kevent;
536
537 event = compat_alloc_user_space(sizeof(*event));
538 if (get_compat_sigevent(&kevent, timer_event_spec) ||
539 copy_to_user(event, &kevent, sizeof(*event)))
540 return -EFAULT;
541 }
542
543 return sys_timer_create(which_clock, event, created_timer_id);
544}
545
1da177e4 546long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 547 struct compat_itimerspec __user *new,
1da177e4 548 struct compat_itimerspec __user *old)
bd3a8492 549{
1da177e4
LT		 550 long err;
551 mm_segment_t oldfs;
552 struct itimerspec newts, oldts;
553
554 if (!new)
555 return -EINVAL;
556 if (get_compat_itimerspec(&newts, new))
bd3a8492 557 return -EFAULT;
1da177e4
LT		 558 oldfs = get_fs();
559 set_fs(KERNEL_DS);
560 err = sys_timer_settime(timer_id, flags,
561 (struct itimerspec __user *) &newts,
562 (struct itimerspec __user *) &oldts);
bd3a8492 563 set_fs(oldfs);
1da177e4
LT		 564 if (!err && old && put_compat_itimerspec(old, &oldts))
565 return -EFAULT;
566 return err;
bd3a8492 567}
1da177e4
LT		 568
569long compat_sys_timer_gettime(timer_t timer_id,
570 struct compat_itimerspec __user *setting)
bd3a8492 571{
1da177e4
LT		 572 long err;
573 mm_segment_t oldfs;
bd3a8492 574 struct itimerspec ts;
1da177e4
LT		 575
576 oldfs = get_fs();
577 set_fs(KERNEL_DS);
578 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 579 (struct itimerspec __user *) &ts);
580 set_fs(oldfs);
1da177e4
LT		 581 if (!err && put_compat_itimerspec(setting, &ts))
582 return -EFAULT;
583 return err;
bd3a8492 584}
1da177e4
LT		 585
586long compat_sys_clock_settime(clockid_t which_clock,
587 struct compat_timespec __user *tp)
588{
589 long err;
590 mm_segment_t oldfs;
bd3a8492 591 struct timespec ts;
1da177e4
LT		 592
593 if (get_compat_timespec(&ts, tp))
bd3a8492 594 return -EFAULT;
1da177e4 595 oldfs = get_fs();
bd3a8492 596 set_fs(KERNEL_DS);
1da177e4
LT		 597 err = sys_clock_settime(which_clock,
598 (struct timespec __user *) &ts);
599 set_fs(oldfs);
600 return err;
bd3a8492 601}
1da177e4
LT		 602
603long compat_sys_clock_gettime(clockid_t which_clock,
604 struct compat_timespec __user *tp)
605{
606 long err;
607 mm_segment_t oldfs;
bd3a8492 608 struct timespec ts;
1da177e4
LT		 609
610 oldfs = get_fs();
611 set_fs(KERNEL_DS);
612 err = sys_clock_gettime(which_clock,
613 (struct timespec __user *) &ts);
614 set_fs(oldfs);
615 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 616 return -EFAULT;
1da177e4 617 return err;
bd3a8492 618}
1da177e4
LT		 619
620long compat_sys_clock_getres(clockid_t which_clock,
621 struct compat_timespec __user *tp)
622{
623 long err;
624 mm_segment_t oldfs;
bd3a8492 625 struct timespec ts;
1da177e4
LT		 626
627 oldfs = get_fs();
628 set_fs(KERNEL_DS);
629 err = sys_clock_getres(which_clock,
630 (struct timespec __user *) &ts);
631 set_fs(oldfs);
632 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 633 return -EFAULT;
1da177e4 634 return err;
bd3a8492 635}
1da177e4 636
1711ef38
TA		 637static long compat_clock_nanosleep_restart(struct restart_block *restart)
638{
639 long err;
640 mm_segment_t oldfs;
641 struct timespec tu;
029a07e0 642 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 643
029a07e0 644 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 645 oldfs = get_fs();
646 set_fs(KERNEL_DS);
647 err = clock_nanosleep_restart(restart);
648 set_fs(oldfs);
649
650 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
651 put_compat_timespec(&tu, rmtp))
652 return -EFAULT;
653
654 if (err == -ERESTART_RESTARTBLOCK) {
655 restart->fn = compat_clock_nanosleep_restart;
029a07e0 656 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 657 }
658 return err;
659}
660
1da177e4
LT		 661long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
662 struct compat_timespec __user *rqtp,
663 struct compat_timespec __user *rmtp)
664{
665 long err;
666 mm_segment_t oldfs;
bd3a8492 667 struct timespec in, out;
1711ef38 668 struct restart_block *restart;
1da177e4 669
bd3a8492 670 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 671 return -EFAULT;
672
673 oldfs = get_fs();
674 set_fs(KERNEL_DS);
675 err = sys_clock_nanosleep(which_clock, flags,
676 (struct timespec __user *) &in,
677 (struct timespec __user *) &out);
678 set_fs(oldfs);
1711ef38 679
1da177e4
LT		 680 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
681 put_compat_timespec(&out, rmtp))
682 return -EFAULT;
1711ef38
TA		 683
684 if (err == -ERESTART_RESTARTBLOCK) {
685 restart = &current_thread_info()->restart_block;
686 restart->fn = compat_clock_nanosleep_restart;
029a07e0 687 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 688 }
bd3a8492
DW		 689 return err;
690}
1da177e4
LT		 691
692/*
693 * We currently only need the following fields from the sigevent
694 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
695 * sigev_notify_thread_id). The others are handled in user mode.
696 * We also assume that copying sigev_value.sival_int is sufficient
697 * to keep all the bits of sigev_value.sival_ptr intact.
698 */
699int get_compat_sigevent(struct sigevent *event,
700 const struct compat_sigevent __user *u_event)
701{
51410d3c 702 memset(event, 0, sizeof(*event));
1da177e4
LT		 703 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
704 __get_user(event->sigev_value.sival_int,
705 &u_event->sigev_value.sival_int) ||
706 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
707 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
708 __get_user(event->sigev_notify_thread_id,
709 &u_event->sigev_notify_thread_id))
710 ? -EFAULT : 0;
711}
712
5fa3839a 713long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 714 unsigned long bitmap_size)
715{
716 int i, j;
717 unsigned long m;
718 compat_ulong_t um;
719 unsigned long nr_compat_longs;
720
721 /* align bitmap up to nearest compat_long_t boundary */
722 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
723
724 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
725 return -EFAULT;
726
727 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
728
729 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
730 m = 0;
731
732 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
733 /*
734 * We dont want to read past the end of the userspace
735 * bitmap. We must however ensure the end of the
736 * kernel bitmap is zeroed.
737 */
738 if (nr_compat_longs-- > 0) {
739 if (__get_user(um, umask))
740 return -EFAULT;
741 } else {
742 um = 0;
743 }
744
745 umask++;
746 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
747 }
748 *mask++ = m;
749 }
750
751 return 0;
752}
753
754long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
755 unsigned long bitmap_size)
756{
757 int i, j;
758 unsigned long m;
759 compat_ulong_t um;
760 unsigned long nr_compat_longs;
761
762 /* align bitmap up to nearest compat_long_t boundary */
763 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
764
765 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
766 return -EFAULT;
767
768 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
769
770 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
771 m = *mask++;
772
773 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
774 um = m;
775
776 /*
777 * We dont want to write past the end of the userspace
778 * bitmap.
779 */
780 if (nr_compat_longs-- > 0) {
781 if (__put_user(um, umask))
782 return -EFAULT;
783 }
784
785 umask++;
786 m >>= 4*sizeof(um);
787 m >>= 4*sizeof(um);
788 }
789 }
790
791 return 0;
792}
793
794void
795sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
796{
797 switch (_NSIG_WORDS) {
1da177e4
LT		 798 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
799 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
800 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
801 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 802 }
803}
804
805asmlinkage long
806compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
807 struct compat_siginfo __user *uinfo,
808 struct compat_timespec __user *uts, compat_size_t sigsetsize)
809{
810 compat_sigset_t s32;
811 sigset_t s;
812 int sig;
813 struct timespec t;
814 siginfo_t info;
815 long ret, timeout = 0;
816
817 if (sigsetsize != sizeof(sigset_t))
818 return -EINVAL;
819
820 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
821 return -EFAULT;
822 sigset_from_compat(&s, &s32);
823 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
824 signotset(&s);
825
826 if (uts) {
827 if (get_compat_timespec (&t, uts))
828 return -EFAULT;
829 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
830 || t.tv_sec < 0)
831 return -EINVAL;
832 }
833
834 spin_lock_irq(&current->sighand->siglock);
835 sig = dequeue_signal(current, &s, &info);
836 if (!sig) {
837 timeout = MAX_SCHEDULE_TIMEOUT;
838 if (uts)
839 timeout = timespec_to_jiffies(&t)
840 +(t.tv_sec || t.tv_nsec);
841 if (timeout) {
842 current->real_blocked = current->blocked;
843 sigandsets(&current->blocked, &current->blocked, &s);
844
845 recalc_sigpending();
846 spin_unlock_irq(&current->sighand->siglock);
847
75bcc8c5 848 timeout = schedule_timeout_interruptible(timeout);
1da177e4
LT		 849
850 spin_lock_irq(&current->sighand->siglock);
851 sig = dequeue_signal(current, &s, &info);
852 current->blocked = current->real_blocked;
853 siginitset(&current->real_blocked, 0);
854 recalc_sigpending();
855 }
856 }
857 spin_unlock_irq(&current->sighand->siglock);
858
859 if (sig) {
860 ret = sig;
861 if (uinfo) {
862 if (copy_siginfo_to_user32(uinfo, &info))
863 ret = -EFAULT;
864 }
865 }else {
866 ret = timeout?-EINTR:-EAGAIN;
867 }
868 return ret;
869
870}
871
872#ifdef __ARCH_WANT_COMPAT_SYS_TIME
873
874/* compat_time_t is a 32 bit "long" and needs to get converted. */
875
876asmlinkage long compat_sys_time(compat_time_t __user * tloc)
877{
878 compat_time_t i;
879 struct timeval tv;
880
881 do_gettimeofday(&tv);
882 i = tv.tv_sec;
883
884 if (tloc) {
885 if (put_user(i,tloc))
886 i = -EFAULT;
887 }
888 return i;
889}
890
891asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
892{
893 struct timespec tv;
894 int err;
895
896 if (get_user(tv.tv_sec, tptr))
897 return -EFAULT;
898
899 tv.tv_nsec = 0;
900
901 err = security_settime(&tv, NULL);
902 if (err)
903 return err;
904
905 do_settimeofday(&tv);
906 return 0;
907}
908
909#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 910
911#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
912asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
913{
914 sigset_t newset;
915 compat_sigset_t newset32;
916
917 /* XXX: Don't preclude handling different sized sigset_t's. */
918 if (sigsetsize != sizeof(sigset_t))
919 return -EINVAL;
920
921 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
922 return -EFAULT;
923 sigset_from_compat(&newset, &newset32);
924 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
925
926 spin_lock_irq(&current->sighand->siglock);
927 current->saved_sigmask = current->blocked;
928 current->blocked = newset;
929 recalc_sigpending();
930 spin_unlock_irq(&current->sighand->siglock);
931
932 current->state = TASK_INTERRUPTIBLE;
933 schedule();
4e4c22c7 934 set_restore_sigmask();
150256d8
DW		 935 return -ERESTARTNOHAND;
936}
937#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 938
939asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
940{
941 struct timex txc;
942 int ret;
943
944 memset(&txc, 0, sizeof(struct timex));
945
946 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
947 __get_user(txc.modes, &utp->modes) ||
948 __get_user(txc.offset, &utp->offset) ||
949 __get_user(txc.freq, &utp->freq) ||
950 __get_user(txc.maxerror, &utp->maxerror) ||
951 __get_user(txc.esterror, &utp->esterror) ||
952 __get_user(txc.status, &utp->status) ||
953 __get_user(txc.constant, &utp->constant) ||
954 __get_user(txc.precision, &utp->precision) ||
955 __get_user(txc.tolerance, &utp->tolerance) ||
956 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
957 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
958 __get_user(txc.tick, &utp->tick) ||
959 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
960 __get_user(txc.jitter, &utp->jitter) ||
961 __get_user(txc.shift, &utp->shift) ||
962 __get_user(txc.stabil, &utp->stabil) ||
963 __get_user(txc.jitcnt, &utp->jitcnt) ||
964 __get_user(txc.calcnt, &utp->calcnt) ||
965 __get_user(txc.errcnt, &utp->errcnt) ||
966 __get_user(txc.stbcnt, &utp->stbcnt))
967 return -EFAULT;
968
969 ret = do_adjtimex(&txc);
970
971 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
972 __put_user(txc.modes, &utp->modes) ||
973 __put_user(txc.offset, &utp->offset) ||
974 __put_user(txc.freq, &utp->freq) ||
975 __put_user(txc.maxerror, &utp->maxerror) ||
976 __put_user(txc.esterror, &utp->esterror) ||
977 __put_user(txc.status, &utp->status) ||
978 __put_user(txc.constant, &utp->constant) ||
979 __put_user(txc.precision, &utp->precision) ||
980 __put_user(txc.tolerance, &utp->tolerance) ||
981 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
982 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
983 __put_user(txc.tick, &utp->tick) ||
984 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
985 __put_user(txc.jitter, &utp->jitter) ||
986 __put_user(txc.shift, &utp->shift) ||
987 __put_user(txc.stabil, &utp->stabil) ||
988 __put_user(txc.jitcnt, &utp->jitcnt) ||
989 __put_user(txc.calcnt, &utp->calcnt) ||
990 __put_user(txc.errcnt, &utp->errcnt) ||
153b5d05
RZ		 991 __put_user(txc.stbcnt, &utp->stbcnt) ||
992 __put_user(txc.tai, &utp->tai))
3158e941
SR		 993 ret = -EFAULT;
994
995 return ret;
996}
1b2db9fb
CL		 997
998#ifdef CONFIG_NUMA
999asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1000 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1001 const int __user *nodes,
1002 int __user *status,
1003 int flags)
1004{
1005 const void __user * __user *pages;
1006 int i;
1007
1008 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1009 for (i = 0; i < nr_pages; i++) {
1010 compat_uptr_t p;
1011
9216dfad 1012 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1013 put_user(compat_ptr(p), pages + i))
1014 return -EFAULT;
1015 }
1016 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1017}
3fd59397
SR		 1018
1019asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1020 compat_ulong_t maxnode,
1021 const compat_ulong_t __user *old_nodes,
1022 const compat_ulong_t __user *new_nodes)
1023{
1024 unsigned long __user *old = NULL;
1025 unsigned long __user *new = NULL;
1026 nodemask_t tmp_mask;
1027 unsigned long nr_bits;
1028 unsigned long size;
1029
1030 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1031 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1032 if (old_nodes) {
1033 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1034 return -EFAULT;
1035 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1036 if (new_nodes)
1037 new = old + size / sizeof(unsigned long);
1038 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1039 return -EFAULT;
1040 }
1041 if (new_nodes) {
1042 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1043 return -EFAULT;
1044 if (new == NULL)
1045 new = compat_alloc_user_space(size);
1046 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1047 return -EFAULT;
1048 }
1049 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1050}
1b2db9fb 1051#endif
d4d23add
KM		 1052
1053struct compat_sysinfo {
1054 s32 uptime;
1055 u32 loads[3];
1056 u32 totalram;
1057 u32 freeram;
1058 u32 sharedram;
1059 u32 bufferram;
1060 u32 totalswap;
1061 u32 freeswap;
1062 u16 procs;
1063 u16 pad;
1064 u32 totalhigh;
1065 u32 freehigh;
1066 u32 mem_unit;
1067 char _f[20-2*sizeof(u32)-sizeof(int)];
1068};
1069
1070asmlinkage long
1071compat_sys_sysinfo(struct compat_sysinfo __user *info)
1072{
1073 struct sysinfo s;
1074
1075 do_sysinfo(&s);
1076
1077 /* Check to see if any memory value is too large for 32-bit and scale
1078 * down if needed
1079 */
1080 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1081 int bitcount = 0;
1082
1083 while (s.mem_unit < PAGE_SIZE) {
1084 s.mem_unit <<= 1;
1085 bitcount++;
1086 }
1087
1088 s.totalram >>= bitcount;
1089 s.freeram >>= bitcount;
1090 s.sharedram >>= bitcount;
1091 s.bufferram >>= bitcount;
1092 s.totalswap >>= bitcount;
1093 s.freeswap >>= bitcount;
1094 s.totalhigh >>= bitcount;
1095 s.freehigh >>= bitcount;
1096 }
1097
1098 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1099 __put_user (s.uptime, &info->uptime) ||
1100 __put_user (s.loads[0], &info->loads[0]) ||
1101 __put_user (s.loads[1], &info->loads[1]) ||
1102 __put_user (s.loads[2], &info->loads[2]) ||
1103 __put_user (s.totalram, &info->totalram) ||
1104 __put_user (s.freeram, &info->freeram) ||
1105 __put_user (s.sharedram, &info->sharedram) ||
1106 __put_user (s.bufferram, &info->bufferram) ||
1107 __put_user (s.totalswap, &info->totalswap) ||
1108 __put_user (s.freeswap, &info->freeswap) ||
1109 __put_user (s.procs, &info->procs) ||
1110 __put_user (s.totalhigh, &info->totalhigh) ||
1111 __put_user (s.freehigh, &info->freehigh) ||
1112 __put_user (s.mem_unit, &info->mem_unit))
1113 return -EFAULT;
1114
1115 return 0;
1116}
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