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Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6
[mirror_ubuntu-artful-kernel.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>
e3d5a27d 27#include <linux/ptrace.h>
5a0e3ad6 28#include <linux/gfp.h>
1da177e4
LT		 29
30#include <asm/uaccess.h>
1da177e4 31
b418da16
CH		 32/*
33 * Note that the native side is already converted to a timespec, because
34 * that's what we want anyway.
35 */
36static int compat_get_timeval(struct timespec *o,
37 struct compat_timeval __user *i)
38{
39 long usec;
40
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;
46}
47
48static int compat_put_timeval(struct compat_timeval __user *o,
49 struct timeval *i)
50{
51 return (put_user(i->tv_sec, &o->tv_sec) ||
52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
53}
54
55asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
56 struct timezone __user *tz)
57{
58 if (tv) {
59 struct timeval ktv;
60 do_gettimeofday(&ktv);
61 if (compat_put_timeval(tv, &ktv))
62 return -EFAULT;
63 }
64 if (tz) {
65 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
66 return -EFAULT;
67 }
68
69 return 0;
70}
71
72asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
73 struct timezone __user *tz)
74{
75 struct timespec kts;
76 struct timezone ktz;
77
78 if (tv) {
79 if (compat_get_timeval(&kts, tv))
80 return -EFAULT;
81 }
82 if (tz) {
83 if (copy_from_user(&ktz, tz, sizeof(ktz)))
84 return -EFAULT;
85 }
86
87 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
88}
89
1da177e4
LT		 90int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
91{
92 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
93 __get_user(ts->tv_sec, &cts->tv_sec) ||
94 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
95}
96
97int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
98{
99 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
100 __put_user(ts->tv_sec, &cts->tv_sec) ||
101 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
102}
103
41652937
ON		 104static long compat_nanosleep_restart(struct restart_block *restart)
105{
106 struct compat_timespec __user *rmtp;
107 struct timespec rmt;
108 mm_segment_t oldfs;
109 long ret;
110
029a07e0 111 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 112 oldfs = get_fs();
113 set_fs(KERNEL_DS);
114 ret = hrtimer_nanosleep_restart(restart);
115 set_fs(oldfs);
116
117 if (ret) {
029a07e0 118 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 119
120 if (rmtp && put_compat_timespec(&rmt, rmtp))
121 return -EFAULT;
122 }
123
124 return ret;
125}
126
1da177e4 127asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 128 struct compat_timespec __user *rmtp)
1da177e4 129{
c70878b4 130 struct timespec tu, rmt;
41652937 131 mm_segment_t oldfs;
c70878b4 132 long ret;
1da177e4 133
c70878b4 134 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 135 return -EFAULT;
136
c70878b4 137 if (!timespec_valid(&tu))
1da177e4
LT		 138 return -EINVAL;
139
41652937
ON		 140 oldfs = get_fs();
141 set_fs(KERNEL_DS);
142 ret = hrtimer_nanosleep(&tu,
143 rmtp ? (struct timespec __user *)&rmt : NULL,
144 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
145 set_fs(oldfs);
146
147 if (ret) {
148 struct restart_block *restart
149 = &current_thread_info()->restart_block;
150
151 restart->fn = compat_nanosleep_restart;
029a07e0 152 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 153
41652937 154 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 155 return -EFAULT;
156 }
c70878b4
AB		 157
158 return ret;
1da177e4
LT		 159}
160
161static inline long get_compat_itimerval(struct itimerval *o,
162 struct compat_itimerval __user *i)
163{
164 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
165 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
166 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
167 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
168 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
169}
170
171static inline long put_compat_itimerval(struct compat_itimerval __user *o,
172 struct itimerval *i)
173{
174 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
175 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
176 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
177 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
178 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
179}
180
181asmlinkage long compat_sys_getitimer(int which,
182 struct compat_itimerval __user *it)
183{
184 struct itimerval kit;
185 int error;
186
187 error = do_getitimer(which, &kit);
188 if (!error && put_compat_itimerval(it, &kit))
189 error = -EFAULT;
190 return error;
191}
192
193asmlinkage long compat_sys_setitimer(int which,
194 struct compat_itimerval __user *in,
195 struct compat_itimerval __user *out)
196{
197 struct itimerval kin, kout;
198 int error;
199
200 if (in) {
201 if (get_compat_itimerval(&kin, in))
202 return -EFAULT;
203 } else
204 memset(&kin, 0, sizeof(kin));
205
206 error = do_setitimer(which, &kin, out ? &kout : NULL);
207 if (error || !out)
208 return error;
209 if (put_compat_itimerval(out, &kout))
210 return -EFAULT;
211 return 0;
212}
213
f06febc9
FM		 214static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
215{
216 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
217}
218
1da177e4
LT		 219asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
220{
1da177e4 221 if (tbuf) {
f06febc9 222 struct tms tms;
1da177e4 223 struct compat_tms tmp;
f06febc9
FM		 224
225 do_sys_times(&tms);
226 /* Convert our struct tms to the compat version. */
227 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
228 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
229 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
230 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 231 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
232 return -EFAULT;
233 }
e3d5a27d 234 force_successful_syscall_return();
1da177e4
LT		 235 return compat_jiffies_to_clock_t(jiffies);
236}
237
238/*
239 * Assumption: old_sigset_t and compat_old_sigset_t are both
240 * types that can be passed to put_user()/get_user().
241 */
242
243asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
244{
245 old_sigset_t s;
246 long ret;
247 mm_segment_t old_fs = get_fs();
248
249 set_fs(KERNEL_DS);
250 ret = sys_sigpending((old_sigset_t __user *) &s);
251 set_fs(old_fs);
252 if (ret == 0)
253 ret = put_user(s, set);
254 return ret;
255}
256
257asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
258 compat_old_sigset_t __user *oset)
259{
260 old_sigset_t s;
261 long ret;
262 mm_segment_t old_fs;
263
264 if (set && get_user(s, set))
265 return -EFAULT;
266 old_fs = get_fs();
267 set_fs(KERNEL_DS);
268 ret = sys_sigprocmask(how,
269 set ? (old_sigset_t __user *) &s : NULL,
270 oset ? (old_sigset_t __user *) &s : NULL);
271 set_fs(old_fs);
272 if (ret == 0)
273 if (oset)
274 ret = put_user(s, oset);
275 return ret;
276}
277
1da177e4
LT		 278asmlinkage long compat_sys_setrlimit(unsigned int resource,
279 struct compat_rlimit __user *rlim)
280{
281 struct rlimit r;
1da177e4
LT		 282
283 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
284 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
285 __get_user(r.rlim_max, &rlim->rlim_max))
286 return -EFAULT;
287
288 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
289 r.rlim_cur = RLIM_INFINITY;
290 if (r.rlim_max == COMPAT_RLIM_INFINITY)
291 r.rlim_max = RLIM_INFINITY;
b9518345 292 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 293}
294
295#ifdef COMPAT_RLIM_OLD_INFINITY
296
297asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
298 struct compat_rlimit __user *rlim)
299{
300 struct rlimit r;
301 int ret;
302 mm_segment_t old_fs = get_fs();
303
304 set_fs(KERNEL_DS);
305 ret = sys_old_getrlimit(resource, &r);
306 set_fs(old_fs);
307
308 if (!ret) {
309 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
310 r.rlim_cur = COMPAT_RLIM_INFINITY;
311 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
312 r.rlim_max = COMPAT_RLIM_INFINITY;
313
314 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
315 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
316 __put_user(r.rlim_max, &rlim->rlim_max))
317 return -EFAULT;
318 }
319 return ret;
320}
321
322#endif
323
b9518345 324asmlinkage long compat_sys_getrlimit(unsigned int resource,
1da177e4
LT		 325 struct compat_rlimit __user *rlim)
326{
327 struct rlimit r;
328 int ret;
1da177e4 329
b9518345 330 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 331 if (!ret) {
332 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
333 r.rlim_cur = COMPAT_RLIM_INFINITY;
334 if (r.rlim_max > COMPAT_RLIM_INFINITY)
335 r.rlim_max = COMPAT_RLIM_INFINITY;
336
337 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
338 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
339 __put_user(r.rlim_max, &rlim->rlim_max))
340 return -EFAULT;
341 }
342 return ret;
343}
344
345int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
346{
347 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
348 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
349 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
350 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
351 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
352 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
353 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
354 __put_user(r->ru_idrss, &ru->ru_idrss) ||
355 __put_user(r->ru_isrss, &ru->ru_isrss) ||
356 __put_user(r->ru_minflt, &ru->ru_minflt) ||
357 __put_user(r->ru_majflt, &ru->ru_majflt) ||
358 __put_user(r->ru_nswap, &ru->ru_nswap) ||
359 __put_user(r->ru_inblock, &ru->ru_inblock) ||
360 __put_user(r->ru_oublock, &ru->ru_oublock) ||
361 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
362 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
363 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
364 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
365 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
366 return -EFAULT;
367 return 0;
368}
369
370asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
371{
372 struct rusage r;
373 int ret;
374 mm_segment_t old_fs = get_fs();
375
376 set_fs(KERNEL_DS);
377 ret = sys_getrusage(who, (struct rusage __user *) &r);
378 set_fs(old_fs);
379
380 if (ret)
381 return ret;
382
383 if (put_compat_rusage(&r, ru))
384 return -EFAULT;
385
386 return 0;
387}
388
389asmlinkage long
390compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
391 struct compat_rusage __user *ru)
392{
393 if (!ru) {
394 return sys_wait4(pid, stat_addr, options, NULL);
395 } else {
396 struct rusage r;
397 int ret;
398 unsigned int status;
399 mm_segment_t old_fs = get_fs();
400
401 set_fs (KERNEL_DS);
402 ret = sys_wait4(pid,
403 (stat_addr ?
404 (unsigned int __user *) &status : NULL),
405 options, (struct rusage __user *) &r);
406 set_fs (old_fs);
407
408 if (ret > 0) {
409 if (put_compat_rusage(&r, ru))
410 return -EFAULT;
411 if (stat_addr && put_user(status, stat_addr))
412 return -EFAULT;
413 }
414 return ret;
415 }
416}
417
418asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
419 struct compat_siginfo __user *uinfo, int options,
420 struct compat_rusage __user *uru)
421{
422 siginfo_t info;
423 struct rusage ru;
424 long ret;
425 mm_segment_t old_fs = get_fs();
426
427 memset(&info, 0, sizeof(info));
428
429 set_fs(KERNEL_DS);
430 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
431 uru ? (struct rusage __user *)&ru : NULL);
432 set_fs(old_fs);
433
434 if ((ret < 0) || (info.si_signo == 0))
435 return ret;
436
437 if (uru) {
438 ret = put_compat_rusage(&ru, uru);
439 if (ret)
440 return ret;
441 }
442
443 BUG_ON(info.si_code & __SI_MASK);
444 info.si_code |= __SI_CHLD;
445 return copy_siginfo_to_user32(uinfo, &info);
446}
447
448static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 449 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 450{
451 unsigned long *k;
452
a45185d2
RR		 453 if (len < cpumask_size())
454 memset(new_mask, 0, cpumask_size());
455 else if (len > cpumask_size())
456 len = cpumask_size();
1da177e4 457
a45185d2 458 k = cpumask_bits(new_mask);
1da177e4
LT		 459 return compat_get_bitmap(k, user_mask_ptr, len * 8);
460}
461
462asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
463 unsigned int len,
464 compat_ulong_t __user *user_mask_ptr)
465{
a45185d2 466 cpumask_var_t new_mask;
1da177e4
LT		 467 int retval;
468
a45185d2
RR		 469 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
470 return -ENOMEM;
471
472 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 473 if (retval)
a45185d2 474 goto out;
1da177e4 475
a45185d2
RR		 476 retval = sched_setaffinity(pid, new_mask);
477out:
478 free_cpumask_var(new_mask);
479 return retval;
1da177e4
LT		 480}
481
482asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
483 compat_ulong_t __user *user_mask_ptr)
484{
485 int ret;
a45185d2 486 cpumask_var_t mask;
1da177e4 487
fa9dc265
KM		 488 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
489 return -EINVAL;
490 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 491 return -EINVAL;
492
a45185d2
RR		 493 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
494 return -ENOMEM;
495
496 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 497 if (ret == 0) {
498 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 499
fa9dc265
KM		 500 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
501 ret = -EFAULT;
502 else
503 ret = retlen;
504 }
a45185d2 505 free_cpumask_var(mask);
fa9dc265 506
a45185d2 507 return ret;
1da177e4
LT		 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
62ab4505
TG		 872asmlinkage long
873compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
874 struct compat_siginfo __user *uinfo)
875{
876 siginfo_t info;
877
878 if (copy_siginfo_from_user32(&info, uinfo))
879 return -EFAULT;
880 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
881}
882
1da177e4
LT		 883#ifdef __ARCH_WANT_COMPAT_SYS_TIME
884
885/* compat_time_t is a 32 bit "long" and needs to get converted. */
886
887asmlinkage long compat_sys_time(compat_time_t __user * tloc)
888{
889 compat_time_t i;
890 struct timeval tv;
891
892 do_gettimeofday(&tv);
893 i = tv.tv_sec;
894
895 if (tloc) {
896 if (put_user(i,tloc))
e3d5a27d 897 return -EFAULT;
1da177e4 898 }
e3d5a27d 899 force_successful_syscall_return();
1da177e4
LT		 900 return i;
901}
902
903asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
904{
905 struct timespec tv;
906 int err;
907
908 if (get_user(tv.tv_sec, tptr))
909 return -EFAULT;
910
911 tv.tv_nsec = 0;
912
913 err = security_settime(&tv, NULL);
914 if (err)
915 return err;
916
917 do_settimeofday(&tv);
918 return 0;
919}
920
921#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 922
923#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
924asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
925{
926 sigset_t newset;
927 compat_sigset_t newset32;
928
929 /* XXX: Don't preclude handling different sized sigset_t's. */
930 if (sigsetsize != sizeof(sigset_t))
931 return -EINVAL;
932
933 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
934 return -EFAULT;
935 sigset_from_compat(&newset, &newset32);
936 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
937
938 spin_lock_irq(&current->sighand->siglock);
939 current->saved_sigmask = current->blocked;
940 current->blocked = newset;
941 recalc_sigpending();
942 spin_unlock_irq(&current->sighand->siglock);
943
944 current->state = TASK_INTERRUPTIBLE;
945 schedule();
4e4c22c7 946 set_restore_sigmask();
150256d8
DW		 947 return -ERESTARTNOHAND;
948}
949#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 950
951asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
952{
953 struct timex txc;
954 int ret;
955
956 memset(&txc, 0, sizeof(struct timex));
957
958 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
959 __get_user(txc.modes, &utp->modes) ||
960 __get_user(txc.offset, &utp->offset) ||
961 __get_user(txc.freq, &utp->freq) ||
962 __get_user(txc.maxerror, &utp->maxerror) ||
963 __get_user(txc.esterror, &utp->esterror) ||
964 __get_user(txc.status, &utp->status) ||
965 __get_user(txc.constant, &utp->constant) ||
966 __get_user(txc.precision, &utp->precision) ||
967 __get_user(txc.tolerance, &utp->tolerance) ||
968 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
969 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
970 __get_user(txc.tick, &utp->tick) ||
971 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
972 __get_user(txc.jitter, &utp->jitter) ||
973 __get_user(txc.shift, &utp->shift) ||
974 __get_user(txc.stabil, &utp->stabil) ||
975 __get_user(txc.jitcnt, &utp->jitcnt) ||
976 __get_user(txc.calcnt, &utp->calcnt) ||
977 __get_user(txc.errcnt, &utp->errcnt) ||
978 __get_user(txc.stbcnt, &utp->stbcnt))
979 return -EFAULT;
980
981 ret = do_adjtimex(&txc);
982
983 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
984 __put_user(txc.modes, &utp->modes) ||
985 __put_user(txc.offset, &utp->offset) ||
986 __put_user(txc.freq, &utp->freq) ||
987 __put_user(txc.maxerror, &utp->maxerror) ||
988 __put_user(txc.esterror, &utp->esterror) ||
989 __put_user(txc.status, &utp->status) ||
990 __put_user(txc.constant, &utp->constant) ||
991 __put_user(txc.precision, &utp->precision) ||
992 __put_user(txc.tolerance, &utp->tolerance) ||
993 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
994 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
995 __put_user(txc.tick, &utp->tick) ||
996 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
997 __put_user(txc.jitter, &utp->jitter) ||
998 __put_user(txc.shift, &utp->shift) ||
999 __put_user(txc.stabil, &utp->stabil) ||
1000 __put_user(txc.jitcnt, &utp->jitcnt) ||
1001 __put_user(txc.calcnt, &utp->calcnt) ||
1002 __put_user(txc.errcnt, &utp->errcnt) ||
153b5d05
RZ		 1003 __put_user(txc.stbcnt, &utp->stbcnt) ||
1004 __put_user(txc.tai, &utp->tai))
3158e941
SR		 1005 ret = -EFAULT;
1006
1007 return ret;
1008}
1b2db9fb
CL		 1009
1010#ifdef CONFIG_NUMA
1011asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1012 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1013 const int __user *nodes,
1014 int __user *status,
1015 int flags)
1016{
1017 const void __user * __user *pages;
1018 int i;
1019
1020 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1021 for (i = 0; i < nr_pages; i++) {
1022 compat_uptr_t p;
1023
9216dfad 1024 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1025 put_user(compat_ptr(p), pages + i))
1026 return -EFAULT;
1027 }
1028 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1029}
3fd59397
SR		 1030
1031asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1032 compat_ulong_t maxnode,
1033 const compat_ulong_t __user *old_nodes,
1034 const compat_ulong_t __user *new_nodes)
1035{
1036 unsigned long __user *old = NULL;
1037 unsigned long __user *new = NULL;
1038 nodemask_t tmp_mask;
1039 unsigned long nr_bits;
1040 unsigned long size;
1041
1042 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1043 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1044 if (old_nodes) {
1045 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1046 return -EFAULT;
1047 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1048 if (new_nodes)
1049 new = old + size / sizeof(unsigned long);
1050 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1051 return -EFAULT;
1052 }
1053 if (new_nodes) {
1054 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1055 return -EFAULT;
1056 if (new == NULL)
1057 new = compat_alloc_user_space(size);
1058 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1059 return -EFAULT;
1060 }
1061 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1062}
1b2db9fb 1063#endif
d4d23add
KM		 1064
1065struct compat_sysinfo {
1066 s32 uptime;
1067 u32 loads[3];
1068 u32 totalram;
1069 u32 freeram;
1070 u32 sharedram;
1071 u32 bufferram;
1072 u32 totalswap;
1073 u32 freeswap;
1074 u16 procs;
1075 u16 pad;
1076 u32 totalhigh;
1077 u32 freehigh;
1078 u32 mem_unit;
1079 char _f[20-2*sizeof(u32)-sizeof(int)];
1080};
1081
1082asmlinkage long
1083compat_sys_sysinfo(struct compat_sysinfo __user *info)
1084{
1085 struct sysinfo s;
1086
1087 do_sysinfo(&s);
1088
1089 /* Check to see if any memory value is too large for 32-bit and scale
1090 * down if needed
1091 */
1092 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1093 int bitcount = 0;
1094
1095 while (s.mem_unit < PAGE_SIZE) {
1096 s.mem_unit <<= 1;
1097 bitcount++;
1098 }
1099
1100 s.totalram >>= bitcount;
1101 s.freeram >>= bitcount;
1102 s.sharedram >>= bitcount;
1103 s.bufferram >>= bitcount;
1104 s.totalswap >>= bitcount;
1105 s.freeswap >>= bitcount;
1106 s.totalhigh >>= bitcount;
1107 s.freehigh >>= bitcount;
1108 }
1109
1110 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1111 __put_user (s.uptime, &info->uptime) ||
1112 __put_user (s.loads[0], &info->loads[0]) ||
1113 __put_user (s.loads[1], &info->loads[1]) ||
1114 __put_user (s.loads[2], &info->loads[2]) ||
1115 __put_user (s.totalram, &info->totalram) ||
1116 __put_user (s.freeram, &info->freeram) ||
1117 __put_user (s.sharedram, &info->sharedram) ||
1118 __put_user (s.bufferram, &info->bufferram) ||
1119 __put_user (s.totalswap, &info->totalswap) ||
1120 __put_user (s.freeswap, &info->freeswap) ||
1121 __put_user (s.procs, &info->procs) ||
1122 __put_user (s.totalhigh, &info->totalhigh) ||
1123 __put_user (s.freehigh, &info->freehigh) ||
1124 __put_user (s.mem_unit, &info->mem_unit))
1125 return -EFAULT;
1126
1127 return 0;
1128}
c41d68a5
PA		 1129
1130/*
1131 * Allocate user-space memory for the duration of a single system call,
1132 * in order to marshall parameters inside a compat thunk.
1133 */
1134void __user *compat_alloc_user_space(unsigned long len)
1135{
1136 void __user *ptr;
1137
1138 /* If len would occupy more than half of the entire compat space... */
1139 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1140 return NULL;
1141
1142 ptr = arch_compat_alloc_user_space(len);
1143
1144 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1145 return NULL;
1146
1147 return ptr;
1148}
1149EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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