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deal with deadlock in d_walk()
[linux-2.6/btrfs-unstable.git] / kernel / compat.c
blobebb3c369d03d594067bda50bdffedd32159026e3
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 */
20 #include <linux/syscalls.h>
21 #include <linux/unistd.h>
22 #include <linux/security.h>
23 #include <linux/timex.h>
24 #include <linux/export.h>
25 #include <linux/migrate.h>
26 #include <linux/posix-timers.h>
27 #include <linux/times.h>
28 #include <linux/ptrace.h>
29 #include <linux/gfp.h>
30
31 #include <asm/uaccess.h>
32
33 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
34 {
35 memset(txc, 0, sizeof(struct timex));
36
37 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
38 __get_user(txc->modes, &utp->modes) ||
39 __get_user(txc->offset, &utp->offset) ||
40 __get_user(txc->freq, &utp->freq) ||
41 __get_user(txc->maxerror, &utp->maxerror) ||
42 __get_user(txc->esterror, &utp->esterror) ||
43 __get_user(txc->status, &utp->status) ||
44 __get_user(txc->constant, &utp->constant) ||
45 __get_user(txc->precision, &utp->precision) ||
46 __get_user(txc->tolerance, &utp->tolerance) ||
47 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
48 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
49 __get_user(txc->tick, &utp->tick) ||
50 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
51 __get_user(txc->jitter, &utp->jitter) ||
52 __get_user(txc->shift, &utp->shift) ||
53 __get_user(txc->stabil, &utp->stabil) ||
54 __get_user(txc->jitcnt, &utp->jitcnt) ||
55 __get_user(txc->calcnt, &utp->calcnt) ||
56 __get_user(txc->errcnt, &utp->errcnt) ||
57 __get_user(txc->stbcnt, &utp->stbcnt))
58 return -EFAULT;
59
60 return 0;
61 }
62
63 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
64 {
65 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
66 __put_user(txc->modes, &utp->modes) ||
67 __put_user(txc->offset, &utp->offset) ||
68 __put_user(txc->freq, &utp->freq) ||
69 __put_user(txc->maxerror, &utp->maxerror) ||
70 __put_user(txc->esterror, &utp->esterror) ||
71 __put_user(txc->status, &utp->status) ||
72 __put_user(txc->constant, &utp->constant) ||
73 __put_user(txc->precision, &utp->precision) ||
74 __put_user(txc->tolerance, &utp->tolerance) ||
75 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
76 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
77 __put_user(txc->tick, &utp->tick) ||
78 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
79 __put_user(txc->jitter, &utp->jitter) ||
80 __put_user(txc->shift, &utp->shift) ||
81 __put_user(txc->stabil, &utp->stabil) ||
82 __put_user(txc->jitcnt, &utp->jitcnt) ||
83 __put_user(txc->calcnt, &utp->calcnt) ||
84 __put_user(txc->errcnt, &utp->errcnt) ||
85 __put_user(txc->stbcnt, &utp->stbcnt) ||
86 __put_user(txc->tai, &utp->tai))
87 return -EFAULT;
88 return 0;
89 }
90
91 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
92 struct timezone __user *, tz)
93 {
94 if (tv) {
95 struct timeval ktv;
96 do_gettimeofday(&ktv);
97 if (compat_put_timeval(&ktv, tv))
98 return -EFAULT;
99 }
100 if (tz) {
101 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
102 return -EFAULT;
103 }
104
105 return 0;
106 }
107
108 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109 struct timezone __user *, tz)
110 {
111 struct timeval user_tv;
112 struct timespec new_ts;
113 struct timezone new_tz;
114
115 if (tv) {
116 if (compat_get_timeval(&user_tv, tv))
117 return -EFAULT;
118 new_ts.tv_sec = user_tv.tv_sec;
119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
120 }
121 if (tz) {
122 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
123 return -EFAULT;
124 }
125
126 return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
127 }
128
129 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
130 {
131 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
132 __get_user(tv->tv_sec, &ctv->tv_sec) ||
133 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
134 }
135
136 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
137 {
138 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
139 __put_user(tv->tv_sec, &ctv->tv_sec) ||
140 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
141 }
142
143 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
144 {
145 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
146 __get_user(ts->tv_sec, &cts->tv_sec) ||
147 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
148 }
149
150 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
151 {
152 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
153 __put_user(ts->tv_sec, &cts->tv_sec) ||
154 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
155 }
156
157 int compat_get_timeval(struct timeval *tv, const void __user *utv)
158 {
159 if (COMPAT_USE_64BIT_TIME)
160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
161 else
162 return __compat_get_timeval(tv, utv);
163 }
164 EXPORT_SYMBOL_GPL(compat_get_timeval);
165
166 int compat_put_timeval(const struct timeval *tv, void __user *utv)
167 {
168 if (COMPAT_USE_64BIT_TIME)
169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
170 else
171 return __compat_put_timeval(tv, utv);
172 }
173 EXPORT_SYMBOL_GPL(compat_put_timeval);
174
175 int compat_get_timespec(struct timespec *ts, const void __user *uts)
176 {
177 if (COMPAT_USE_64BIT_TIME)
178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
179 else
180 return __compat_get_timespec(ts, uts);
181 }
182 EXPORT_SYMBOL_GPL(compat_get_timespec);
183
184 int compat_put_timespec(const struct timespec *ts, void __user *uts)
185 {
186 if (COMPAT_USE_64BIT_TIME)
187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
188 else
189 return __compat_put_timespec(ts, uts);
190 }
191 EXPORT_SYMBOL_GPL(compat_put_timespec);
192
193 int compat_convert_timespec(struct timespec __user **kts,
194 const void __user *cts)
195 {
196 struct timespec ts;
197 struct timespec __user *uts;
198
199 if (!cts || COMPAT_USE_64BIT_TIME) {
200 *kts = (struct timespec __user *)cts;
201 return 0;
202 }
203
204 uts = compat_alloc_user_space(sizeof(ts));
205 if (!uts)
206 return -EFAULT;
207 if (compat_get_timespec(&ts, cts))
208 return -EFAULT;
209 if (copy_to_user(uts, &ts, sizeof(ts)))
210 return -EFAULT;
211
212 *kts = uts;
213 return 0;
214 }
215
216 static long compat_nanosleep_restart(struct restart_block *restart)
217 {
218 struct compat_timespec __user *rmtp;
219 struct timespec rmt;
220 mm_segment_t oldfs;
221 long ret;
222
223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
224 oldfs = get_fs();
225 set_fs(KERNEL_DS);
226 ret = hrtimer_nanosleep_restart(restart);
227 set_fs(oldfs);
228
229 if (ret == -ERESTART_RESTARTBLOCK) {
230 rmtp = restart->nanosleep.compat_rmtp;
231
232 if (rmtp && compat_put_timespec(&rmt, rmtp))
233 return -EFAULT;
234 }
235
236 return ret;
237 }
238
239 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240 struct compat_timespec __user *, rmtp)
241 {
242 struct timespec tu, rmt;
243 mm_segment_t oldfs;
244 long ret;
245
246 if (compat_get_timespec(&tu, rqtp))
247 return -EFAULT;
248
249 if (!timespec_valid(&tu))
250 return -EINVAL;
251
252 oldfs = get_fs();
253 set_fs(KERNEL_DS);
254 ret = hrtimer_nanosleep(&tu,
255 rmtp ? (struct timespec __user *)&rmt : NULL,
256 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
257 set_fs(oldfs);
258
259 /*
260 * hrtimer_nanosleep() can only return 0 or
261 * -ERESTART_RESTARTBLOCK here because:
262 *
263 * - we call it with HRTIMER_MODE_REL and therefor exclude the
264 * -ERESTARTNOHAND return path.
265 *
266 * - we supply the rmtp argument from the task stack (due to
267 * the necessary compat conversion. So the update cannot
268 * fail, which excludes the -EFAULT return path as well. If
269 * it fails nevertheless we have a bigger problem and wont
270 * reach this place anymore.
271 *
272 * - if the return value is 0, we do not have to update rmtp
273 * because there is no remaining time.
274 *
275 * We check for -ERESTART_RESTARTBLOCK nevertheless if the
276 * core implementation decides to return random nonsense.
277 */
278 if (ret == -ERESTART_RESTARTBLOCK) {
279 struct restart_block *restart
280 = &current_thread_info()->restart_block;
281
282 restart->fn = compat_nanosleep_restart;
283 restart->nanosleep.compat_rmtp = rmtp;
284
285 if (rmtp && compat_put_timespec(&rmt, rmtp))
286 return -EFAULT;
287 }
288 return ret;
289 }
290
291 static inline long get_compat_itimerval(struct itimerval *o,
292 struct compat_itimerval __user *i)
293 {
294 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
295 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
296 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
297 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
298 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
299 }
300
301 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
302 struct itimerval *i)
303 {
304 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
305 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
306 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
307 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
308 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
309 }
310
311 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
312 struct compat_itimerval __user *, it)
313 {
314 struct itimerval kit;
315 int error;
316
317 error = do_getitimer(which, &kit);
318 if (!error && put_compat_itimerval(it, &kit))
319 error = -EFAULT;
320 return error;
321 }
322
323 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
324 struct compat_itimerval __user *, in,
325 struct compat_itimerval __user *, out)
326 {
327 struct itimerval kin, kout;
328 int error;
329
330 if (in) {
331 if (get_compat_itimerval(&kin, in))
332 return -EFAULT;
333 } else
334 memset(&kin, 0, sizeof(kin));
335
336 error = do_setitimer(which, &kin, out ? &kout : NULL);
337 if (error || !out)
338 return error;
339 if (put_compat_itimerval(out, &kout))
340 return -EFAULT;
341 return 0;
342 }
343
344 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
345 {
346 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
347 }
348
349 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
350 {
351 if (tbuf) {
352 struct tms tms;
353 struct compat_tms tmp;
354
355 do_sys_times(&tms);
356 /* Convert our struct tms to the compat version. */
357 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
358 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
359 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
360 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
361 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
362 return -EFAULT;
363 }
364 force_successful_syscall_return();
365 return compat_jiffies_to_clock_t(jiffies);
366 }
367
368 #ifdef __ARCH_WANT_SYS_SIGPENDING
369
370 /*
371 * Assumption: old_sigset_t and compat_old_sigset_t are both
372 * types that can be passed to put_user()/get_user().
373 */
374
375 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
376 {
377 old_sigset_t s;
378 long ret;
379 mm_segment_t old_fs = get_fs();
380
381 set_fs(KERNEL_DS);
382 ret = sys_sigpending((old_sigset_t __user *) &s);
383 set_fs(old_fs);
384 if (ret == 0)
385 ret = put_user(s, set);
386 return ret;
387 }
388
389 #endif
390
391 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
392
393 /*
394 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
395 * blocked set of signals to the supplied signal set
396 */
397 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
398 {
399 memcpy(blocked->sig, &set, sizeof(set));
400 }
401
402 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
403 compat_old_sigset_t __user *, nset,
404 compat_old_sigset_t __user *, oset)
405 {
406 old_sigset_t old_set, new_set;
407 sigset_t new_blocked;
408
409 old_set = current->blocked.sig[0];
410
411 if (nset) {
412 if (get_user(new_set, nset))
413 return -EFAULT;
414 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
415
416 new_blocked = current->blocked;
417
418 switch (how) {
419 case SIG_BLOCK:
420 sigaddsetmask(&new_blocked, new_set);
421 break;
422 case SIG_UNBLOCK:
423 sigdelsetmask(&new_blocked, new_set);
424 break;
425 case SIG_SETMASK:
426 compat_sig_setmask(&new_blocked, new_set);
427 break;
428 default:
429 return -EINVAL;
430 }
431
432 set_current_blocked(&new_blocked);
433 }
434
435 if (oset) {
436 if (put_user(old_set, oset))
437 return -EFAULT;
438 }
439
440 return 0;
441 }
442
443 #endif
444
445 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
446 struct compat_rlimit __user *, rlim)
447 {
448 struct rlimit r;
449
450 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
451 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
452 __get_user(r.rlim_max, &rlim->rlim_max))
453 return -EFAULT;
454
455 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
456 r.rlim_cur = RLIM_INFINITY;
457 if (r.rlim_max == COMPAT_RLIM_INFINITY)
458 r.rlim_max = RLIM_INFINITY;
459 return do_prlimit(current, resource, &r, NULL);
460 }
461
462 #ifdef COMPAT_RLIM_OLD_INFINITY
463
464 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
465 struct compat_rlimit __user *, rlim)
466 {
467 struct rlimit r;
468 int ret;
469 mm_segment_t old_fs = get_fs();
470
471 set_fs(KERNEL_DS);
472 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
473 set_fs(old_fs);
474
475 if (!ret) {
476 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
477 r.rlim_cur = COMPAT_RLIM_INFINITY;
478 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
479 r.rlim_max = COMPAT_RLIM_INFINITY;
480
481 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
482 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
483 __put_user(r.rlim_max, &rlim->rlim_max))
484 return -EFAULT;
485 }
486 return ret;
487 }
488
489 #endif
490
491 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
492 struct compat_rlimit __user *, rlim)
493 {
494 struct rlimit r;
495 int ret;
496
497 ret = do_prlimit(current, resource, NULL, &r);
498 if (!ret) {
499 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
500 r.rlim_cur = COMPAT_RLIM_INFINITY;
501 if (r.rlim_max > COMPAT_RLIM_INFINITY)
502 r.rlim_max = COMPAT_RLIM_INFINITY;
503
504 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
505 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
506 __put_user(r.rlim_max, &rlim->rlim_max))
507 return -EFAULT;
508 }
509 return ret;
510 }
511
512 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
513 {
514 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
515 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
516 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
517 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
518 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
519 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
520 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
521 __put_user(r->ru_idrss, &ru->ru_idrss) ||
522 __put_user(r->ru_isrss, &ru->ru_isrss) ||
523 __put_user(r->ru_minflt, &ru->ru_minflt) ||
524 __put_user(r->ru_majflt, &ru->ru_majflt) ||
525 __put_user(r->ru_nswap, &ru->ru_nswap) ||
526 __put_user(r->ru_inblock, &ru->ru_inblock) ||
527 __put_user(r->ru_oublock, &ru->ru_oublock) ||
528 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
529 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
530 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
531 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
532 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
533 return -EFAULT;
534 return 0;
535 }
536
537 COMPAT_SYSCALL_DEFINE4(wait4,
538 compat_pid_t, pid,
539 compat_uint_t __user *, stat_addr,
540 int, options,
541 struct compat_rusage __user *, ru)
542 {
543 if (!ru) {
544 return sys_wait4(pid, stat_addr, options, NULL);
545 } else {
546 struct rusage r;
547 int ret;
548 unsigned int status;
549 mm_segment_t old_fs = get_fs();
550
551 set_fs (KERNEL_DS);
552 ret = sys_wait4(pid,
553 (stat_addr ?
554 (unsigned int __user *) &status : NULL),
555 options, (struct rusage __user *) &r);
556 set_fs (old_fs);
557
558 if (ret > 0) {
559 if (put_compat_rusage(&r, ru))
560 return -EFAULT;
561 if (stat_addr && put_user(status, stat_addr))
562 return -EFAULT;
563 }
564 return ret;
565 }
566 }
567
568 COMPAT_SYSCALL_DEFINE5(waitid,
569 int, which, compat_pid_t, pid,
570 struct compat_siginfo __user *, uinfo, int, options,
571 struct compat_rusage __user *, uru)
572 {
573 siginfo_t info;
574 struct rusage ru;
575 long ret;
576 mm_segment_t old_fs = get_fs();
577
578 memset(&info, 0, sizeof(info));
579
580 set_fs(KERNEL_DS);
581 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
582 uru ? (struct rusage __user *)&ru : NULL);
583 set_fs(old_fs);
584
585 if ((ret < 0) || (info.si_signo == 0))
586 return ret;
587
588 if (uru) {
589 /* sys_waitid() overwrites everything in ru */
590 if (COMPAT_USE_64BIT_TIME)
591 ret = copy_to_user(uru, &ru, sizeof(ru));
592 else
593 ret = put_compat_rusage(&ru, uru);
594 if (ret)
595 return -EFAULT;
596 }
597
598 BUG_ON(info.si_code & __SI_MASK);
599 info.si_code |= __SI_CHLD;
600 return copy_siginfo_to_user32(uinfo, &info);
601 }
602
603 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
604 unsigned len, struct cpumask *new_mask)
605 {
606 unsigned long *k;
607
608 if (len < cpumask_size())
609 memset(new_mask, 0, cpumask_size());
610 else if (len > cpumask_size())
611 len = cpumask_size();
612
613 k = cpumask_bits(new_mask);
614 return compat_get_bitmap(k, user_mask_ptr, len * 8);
615 }
616
617 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
618 unsigned int, len,
619 compat_ulong_t __user *, user_mask_ptr)
620 {
621 cpumask_var_t new_mask;
622 int retval;
623
624 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
625 return -ENOMEM;
626
627 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
628 if (retval)
629 goto out;
630
631 retval = sched_setaffinity(pid, new_mask);
632 out:
633 free_cpumask_var(new_mask);
634 return retval;
635 }
636
637 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
638 compat_ulong_t __user *, user_mask_ptr)
639 {
640 int ret;
641 cpumask_var_t mask;
642
643 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
644 return -EINVAL;
645 if (len & (sizeof(compat_ulong_t)-1))
646 return -EINVAL;
647
648 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
649 return -ENOMEM;
650
651 ret = sched_getaffinity(pid, mask);
652 if (ret == 0) {
653 size_t retlen = min_t(size_t, len, cpumask_size());
654
655 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
656 ret = -EFAULT;
657 else
658 ret = retlen;
659 }
660 free_cpumask_var(mask);
661
662 return ret;
663 }
664
665 int get_compat_itimerspec(struct itimerspec *dst,
666 const struct compat_itimerspec __user *src)
667 {
668 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
669 __compat_get_timespec(&dst->it_value, &src->it_value))
670 return -EFAULT;
671 return 0;
672 }
673
674 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
675 const struct itimerspec *src)
676 {
677 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
678 __compat_put_timespec(&src->it_value, &dst->it_value))
679 return -EFAULT;
680 return 0;
681 }
682
683 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
684 struct compat_sigevent __user *, timer_event_spec,
685 timer_t __user *, created_timer_id)
686 {
687 struct sigevent __user *event = NULL;
688
689 if (timer_event_spec) {
690 struct sigevent kevent;
691
692 event = compat_alloc_user_space(sizeof(*event));
693 if (get_compat_sigevent(&kevent, timer_event_spec) ||
694 copy_to_user(event, &kevent, sizeof(*event)))
695 return -EFAULT;
696 }
697
698 return sys_timer_create(which_clock, event, created_timer_id);
699 }
700
701 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
702 struct compat_itimerspec __user *, new,
703 struct compat_itimerspec __user *, old)
704 {
705 long err;
706 mm_segment_t oldfs;
707 struct itimerspec newts, oldts;
708
709 if (!new)
710 return -EINVAL;
711 if (get_compat_itimerspec(&newts, new))
712 return -EFAULT;
713 oldfs = get_fs();
714 set_fs(KERNEL_DS);
715 err = sys_timer_settime(timer_id, flags,
716 (struct itimerspec __user *) &newts,
717 (struct itimerspec __user *) &oldts);
718 set_fs(oldfs);
719 if (!err && old && put_compat_itimerspec(old, &oldts))
720 return -EFAULT;
721 return err;
722 }
723
724 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
725 struct compat_itimerspec __user *, setting)
726 {
727 long err;
728 mm_segment_t oldfs;
729 struct itimerspec ts;
730
731 oldfs = get_fs();
732 set_fs(KERNEL_DS);
733 err = sys_timer_gettime(timer_id,
734 (struct itimerspec __user *) &ts);
735 set_fs(oldfs);
736 if (!err && put_compat_itimerspec(setting, &ts))
737 return -EFAULT;
738 return err;
739 }
740
741 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
742 struct compat_timespec __user *, tp)
743 {
744 long err;
745 mm_segment_t oldfs;
746 struct timespec ts;
747
748 if (compat_get_timespec(&ts, tp))
749 return -EFAULT;
750 oldfs = get_fs();
751 set_fs(KERNEL_DS);
752 err = sys_clock_settime(which_clock,
753 (struct timespec __user *) &ts);
754 set_fs(oldfs);
755 return err;
756 }
757
758 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
759 struct compat_timespec __user *, tp)
760 {
761 long err;
762 mm_segment_t oldfs;
763 struct timespec ts;
764
765 oldfs = get_fs();
766 set_fs(KERNEL_DS);
767 err = sys_clock_gettime(which_clock,
768 (struct timespec __user *) &ts);
769 set_fs(oldfs);
770 if (!err && compat_put_timespec(&ts, tp))
771 return -EFAULT;
772 return err;
773 }
774
775 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
776 struct compat_timex __user *, utp)
777 {
778 struct timex txc;
779 mm_segment_t oldfs;
780 int err, ret;
781
782 err = compat_get_timex(&txc, utp);
783 if (err)
784 return err;
785
786 oldfs = get_fs();
787 set_fs(KERNEL_DS);
788 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
789 set_fs(oldfs);
790
791 err = compat_put_timex(utp, &txc);
792 if (err)
793 return err;
794
795 return ret;
796 }
797
798 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
799 struct compat_timespec __user *, tp)
800 {
801 long err;
802 mm_segment_t oldfs;
803 struct timespec ts;
804
805 oldfs = get_fs();
806 set_fs(KERNEL_DS);
807 err = sys_clock_getres(which_clock,
808 (struct timespec __user *) &ts);
809 set_fs(oldfs);
810 if (!err && tp && compat_put_timespec(&ts, tp))
811 return -EFAULT;
812 return err;
813 }
814
815 static long compat_clock_nanosleep_restart(struct restart_block *restart)
816 {
817 long err;
818 mm_segment_t oldfs;
819 struct timespec tu;
820 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
821
822 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
823 oldfs = get_fs();
824 set_fs(KERNEL_DS);
825 err = clock_nanosleep_restart(restart);
826 set_fs(oldfs);
827
828 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
829 compat_put_timespec(&tu, rmtp))
830 return -EFAULT;
831
832 if (err == -ERESTART_RESTARTBLOCK) {
833 restart->fn = compat_clock_nanosleep_restart;
834 restart->nanosleep.compat_rmtp = rmtp;
835 }
836 return err;
837 }
838
839 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
840 struct compat_timespec __user *, rqtp,
841 struct compat_timespec __user *, rmtp)
842 {
843 long err;
844 mm_segment_t oldfs;
845 struct timespec in, out;
846 struct restart_block *restart;
847
848 if (compat_get_timespec(&in, rqtp))
849 return -EFAULT;
850
851 oldfs = get_fs();
852 set_fs(KERNEL_DS);
853 err = sys_clock_nanosleep(which_clock, flags,
854 (struct timespec __user *) &in,
855 (struct timespec __user *) &out);
856 set_fs(oldfs);
857
858 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
859 compat_put_timespec(&out, rmtp))
860 return -EFAULT;
861
862 if (err == -ERESTART_RESTARTBLOCK) {
863 restart = &current_thread_info()->restart_block;
864 restart->fn = compat_clock_nanosleep_restart;
865 restart->nanosleep.compat_rmtp = rmtp;
866 }
867 return err;
868 }
869
870 /*
871 * We currently only need the following fields from the sigevent
872 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
873 * sigev_notify_thread_id). The others are handled in user mode.
874 * We also assume that copying sigev_value.sival_int is sufficient
875 * to keep all the bits of sigev_value.sival_ptr intact.
876 */
877 int get_compat_sigevent(struct sigevent *event,
878 const struct compat_sigevent __user *u_event)
879 {
880 memset(event, 0, sizeof(*event));
881 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
882 __get_user(event->sigev_value.sival_int,
883 &u_event->sigev_value.sival_int) ||
884 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
885 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
886 __get_user(event->sigev_notify_thread_id,
887 &u_event->sigev_notify_thread_id))
888 ? -EFAULT : 0;
889 }
890
891 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
892 unsigned long bitmap_size)
893 {
894 int i, j;
895 unsigned long m;
896 compat_ulong_t um;
897 unsigned long nr_compat_longs;
898
899 /* align bitmap up to nearest compat_long_t boundary */
900 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
901
902 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
903 return -EFAULT;
904
905 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
906
907 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
908 m = 0;
909
910 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
911 /*
912 * We dont want to read past the end of the userspace
913 * bitmap. We must however ensure the end of the
914 * kernel bitmap is zeroed.
915 */
916 if (nr_compat_longs-- > 0) {
917 if (__get_user(um, umask))
918 return -EFAULT;
919 } else {
920 um = 0;
921 }
922
923 umask++;
924 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
925 }
926 *mask++ = m;
927 }
928
929 return 0;
930 }
931
932 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
933 unsigned long bitmap_size)
934 {
935 int i, j;
936 unsigned long m;
937 compat_ulong_t um;
938 unsigned long nr_compat_longs;
939
940 /* align bitmap up to nearest compat_long_t boundary */
941 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
942
943 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
944 return -EFAULT;
945
946 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
947
948 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
949 m = *mask++;
950
951 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
952 um = m;
953
954 /*
955 * We dont want to write past the end of the userspace
956 * bitmap.
957 */
958 if (nr_compat_longs-- > 0) {
959 if (__put_user(um, umask))
960 return -EFAULT;
961 }
962
963 umask++;
964 m >>= 4*sizeof(um);
965 m >>= 4*sizeof(um);
966 }
967 }
968
969 return 0;
970 }
971
972 void
973 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
974 {
975 switch (_NSIG_WORDS) {
976 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
977 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
978 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
979 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
980 }
981 }
982 EXPORT_SYMBOL_GPL(sigset_from_compat);
983
984 void
985 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
986 {
987 switch (_NSIG_WORDS) {
988 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
989 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
990 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
991 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
992 }
993 }
994
995 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
996 struct compat_siginfo __user *, uinfo,
997 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
998 {
999 compat_sigset_t s32;
1000 sigset_t s;
1001 struct timespec t;
1002 siginfo_t info;
1003 long ret;
1004
1005 if (sigsetsize != sizeof(sigset_t))
1006 return -EINVAL;
1007
1008 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1009 return -EFAULT;
1010 sigset_from_compat(&s, &s32);
1011
1012 if (uts) {
1013 if (compat_get_timespec(&t, uts))
1014 return -EFAULT;
1015 }
1016
1017 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1018
1019 if (ret > 0 && uinfo) {
1020 if (copy_siginfo_to_user32(uinfo, &info))
1021 ret = -EFAULT;
1022 }
1023
1024 return ret;
1025 }
1026
1027 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1028
1029 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1030
1031 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1032 {
1033 compat_time_t i;
1034 struct timeval tv;
1035
1036 do_gettimeofday(&tv);
1037 i = tv.tv_sec;
1038
1039 if (tloc) {
1040 if (put_user(i,tloc))
1041 return -EFAULT;
1042 }
1043 force_successful_syscall_return();
1044 return i;
1045 }
1046
1047 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1048 {
1049 struct timespec tv;
1050 int err;
1051
1052 if (get_user(tv.tv_sec, tptr))
1053 return -EFAULT;
1054
1055 tv.tv_nsec = 0;
1056
1057 err = security_settime(&tv, NULL);
1058 if (err)
1059 return err;
1060
1061 do_settimeofday(&tv);
1062 return 0;
1063 }
1064
1065 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1066
1067 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1068 {
1069 struct timex txc;
1070 int err, ret;
1071
1072 err = compat_get_timex(&txc, utp);
1073 if (err)
1074 return err;
1075
1076 ret = do_adjtimex(&txc);
1077
1078 err = compat_put_timex(utp, &txc);
1079 if (err)
1080 return err;
1081
1082 return ret;
1083 }
1084
1085 #ifdef CONFIG_NUMA
1086 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1087 compat_uptr_t __user *, pages32,
1088 const int __user *, nodes,
1089 int __user *, status,
1090 int, flags)
1091 {
1092 const void __user * __user *pages;
1093 int i;
1094
1095 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1096 for (i = 0; i < nr_pages; i++) {
1097 compat_uptr_t p;
1098
1099 if (get_user(p, pages32 + i) ||
1100 put_user(compat_ptr(p), pages + i))
1101 return -EFAULT;
1102 }
1103 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1104 }
1105
1106 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1107 compat_ulong_t, maxnode,
1108 const compat_ulong_t __user *, old_nodes,
1109 const compat_ulong_t __user *, new_nodes)
1110 {
1111 unsigned long __user *old = NULL;
1112 unsigned long __user *new = NULL;
1113 nodemask_t tmp_mask;
1114 unsigned long nr_bits;
1115 unsigned long size;
1116
1117 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1118 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1119 if (old_nodes) {
1120 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1121 return -EFAULT;
1122 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1123 if (new_nodes)
1124 new = old + size / sizeof(unsigned long);
1125 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1126 return -EFAULT;
1127 }
1128 if (new_nodes) {
1129 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1130 return -EFAULT;
1131 if (new == NULL)
1132 new = compat_alloc_user_space(size);
1133 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1134 return -EFAULT;
1135 }
1136 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1137 }
1138 #endif
1139
1140 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1141 compat_pid_t, pid,
1142 struct compat_timespec __user *, interval)
1143 {
1144 struct timespec t;
1145 int ret;
1146 mm_segment_t old_fs = get_fs();
1147
1148 set_fs(KERNEL_DS);
1149 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1150 set_fs(old_fs);
1151 if (compat_put_timespec(&t, interval))
1152 return -EFAULT;
1153 return ret;
1154 }
1155
1156 /*
1157 * Allocate user-space memory for the duration of a single system call,
1158 * in order to marshall parameters inside a compat thunk.
1159 */
1160 void __user *compat_alloc_user_space(unsigned long len)
1161 {
1162 void __user *ptr;
1163
1164 /* If len would occupy more than half of the entire compat space... */
1165 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1166 return NULL;
1167
1168 ptr = arch_compat_alloc_user_space(len);
1169
1170 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1171 return NULL;
1172
1173 return ptr;
1174 }
1175 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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