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vhost: lockless enqueuing
[linux/fpc-iii.git] / kernel / compat.c
blob333d364be29d9e6c8b209d9eaded9d28552a36d7
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 = &current->restart_block;
280
281 restart->fn = compat_nanosleep_restart;
282 restart->nanosleep.compat_rmtp = rmtp;
283
284 if (rmtp && compat_put_timespec(&rmt, rmtp))
285 return -EFAULT;
286 }
287 return ret;
288 }
289
290 static inline long get_compat_itimerval(struct itimerval *o,
291 struct compat_itimerval __user *i)
292 {
293 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
294 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
295 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
296 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
297 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
298 }
299
300 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
301 struct itimerval *i)
302 {
303 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
304 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
305 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
306 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
307 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
308 }
309
310 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
311 struct compat_itimerval __user *, it)
312 {
313 struct itimerval kit;
314 int error;
315
316 error = do_getitimer(which, &kit);
317 if (!error && put_compat_itimerval(it, &kit))
318 error = -EFAULT;
319 return error;
320 }
321
322 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
323 struct compat_itimerval __user *, in,
324 struct compat_itimerval __user *, out)
325 {
326 struct itimerval kin, kout;
327 int error;
328
329 if (in) {
330 if (get_compat_itimerval(&kin, in))
331 return -EFAULT;
332 } else
333 memset(&kin, 0, sizeof(kin));
334
335 error = do_setitimer(which, &kin, out ? &kout : NULL);
336 if (error || !out)
337 return error;
338 if (put_compat_itimerval(out, &kout))
339 return -EFAULT;
340 return 0;
341 }
342
343 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
344 {
345 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
346 }
347
348 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
349 {
350 if (tbuf) {
351 struct tms tms;
352 struct compat_tms tmp;
353
354 do_sys_times(&tms);
355 /* Convert our struct tms to the compat version. */
356 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
357 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
358 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
359 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
360 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
361 return -EFAULT;
362 }
363 force_successful_syscall_return();
364 return compat_jiffies_to_clock_t(jiffies);
365 }
366
367 #ifdef __ARCH_WANT_SYS_SIGPENDING
368
369 /*
370 * Assumption: old_sigset_t and compat_old_sigset_t are both
371 * types that can be passed to put_user()/get_user().
372 */
373
374 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
375 {
376 old_sigset_t s;
377 long ret;
378 mm_segment_t old_fs = get_fs();
379
380 set_fs(KERNEL_DS);
381 ret = sys_sigpending((old_sigset_t __user *) &s);
382 set_fs(old_fs);
383 if (ret == 0)
384 ret = put_user(s, set);
385 return ret;
386 }
387
388 #endif
389
390 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
391
392 /*
393 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
394 * blocked set of signals to the supplied signal set
395 */
396 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
397 {
398 memcpy(blocked->sig, &set, sizeof(set));
399 }
400
401 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
402 compat_old_sigset_t __user *, nset,
403 compat_old_sigset_t __user *, oset)
404 {
405 old_sigset_t old_set, new_set;
406 sigset_t new_blocked;
407
408 old_set = current->blocked.sig[0];
409
410 if (nset) {
411 if (get_user(new_set, nset))
412 return -EFAULT;
413 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
414
415 new_blocked = current->blocked;
416
417 switch (how) {
418 case SIG_BLOCK:
419 sigaddsetmask(&new_blocked, new_set);
420 break;
421 case SIG_UNBLOCK:
422 sigdelsetmask(&new_blocked, new_set);
423 break;
424 case SIG_SETMASK:
425 compat_sig_setmask(&new_blocked, new_set);
426 break;
427 default:
428 return -EINVAL;
429 }
430
431 set_current_blocked(&new_blocked);
432 }
433
434 if (oset) {
435 if (put_user(old_set, oset))
436 return -EFAULT;
437 }
438
439 return 0;
440 }
441
442 #endif
443
444 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
445 struct compat_rlimit __user *, rlim)
446 {
447 struct rlimit r;
448
449 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
450 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
451 __get_user(r.rlim_max, &rlim->rlim_max))
452 return -EFAULT;
453
454 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
455 r.rlim_cur = RLIM_INFINITY;
456 if (r.rlim_max == COMPAT_RLIM_INFINITY)
457 r.rlim_max = RLIM_INFINITY;
458 return do_prlimit(current, resource, &r, NULL);
459 }
460
461 #ifdef COMPAT_RLIM_OLD_INFINITY
462
463 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
464 struct compat_rlimit __user *, rlim)
465 {
466 struct rlimit r;
467 int ret;
468 mm_segment_t old_fs = get_fs();
469
470 set_fs(KERNEL_DS);
471 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
472 set_fs(old_fs);
473
474 if (!ret) {
475 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
476 r.rlim_cur = COMPAT_RLIM_INFINITY;
477 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
478 r.rlim_max = COMPAT_RLIM_INFINITY;
479
480 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
481 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
482 __put_user(r.rlim_max, &rlim->rlim_max))
483 return -EFAULT;
484 }
485 return ret;
486 }
487
488 #endif
489
490 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
491 struct compat_rlimit __user *, rlim)
492 {
493 struct rlimit r;
494 int ret;
495
496 ret = do_prlimit(current, resource, NULL, &r);
497 if (!ret) {
498 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
499 r.rlim_cur = COMPAT_RLIM_INFINITY;
500 if (r.rlim_max > COMPAT_RLIM_INFINITY)
501 r.rlim_max = COMPAT_RLIM_INFINITY;
502
503 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
504 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
505 __put_user(r.rlim_max, &rlim->rlim_max))
506 return -EFAULT;
507 }
508 return ret;
509 }
510
511 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
512 {
513 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
514 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
515 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
516 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
517 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
518 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
519 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
520 __put_user(r->ru_idrss, &ru->ru_idrss) ||
521 __put_user(r->ru_isrss, &ru->ru_isrss) ||
522 __put_user(r->ru_minflt, &ru->ru_minflt) ||
523 __put_user(r->ru_majflt, &ru->ru_majflt) ||
524 __put_user(r->ru_nswap, &ru->ru_nswap) ||
525 __put_user(r->ru_inblock, &ru->ru_inblock) ||
526 __put_user(r->ru_oublock, &ru->ru_oublock) ||
527 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
528 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
529 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
530 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
531 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
532 return -EFAULT;
533 return 0;
534 }
535
536 COMPAT_SYSCALL_DEFINE4(wait4,
537 compat_pid_t, pid,
538 compat_uint_t __user *, stat_addr,
539 int, options,
540 struct compat_rusage __user *, ru)
541 {
542 if (!ru) {
543 return sys_wait4(pid, stat_addr, options, NULL);
544 } else {
545 struct rusage r;
546 int ret;
547 unsigned int status;
548 mm_segment_t old_fs = get_fs();
549
550 set_fs (KERNEL_DS);
551 ret = sys_wait4(pid,
552 (stat_addr ?
553 (unsigned int __user *) &status : NULL),
554 options, (struct rusage __user *) &r);
555 set_fs (old_fs);
556
557 if (ret > 0) {
558 if (put_compat_rusage(&r, ru))
559 return -EFAULT;
560 if (stat_addr && put_user(status, stat_addr))
561 return -EFAULT;
562 }
563 return ret;
564 }
565 }
566
567 COMPAT_SYSCALL_DEFINE5(waitid,
568 int, which, compat_pid_t, pid,
569 struct compat_siginfo __user *, uinfo, int, options,
570 struct compat_rusage __user *, uru)
571 {
572 siginfo_t info;
573 struct rusage ru;
574 long ret;
575 mm_segment_t old_fs = get_fs();
576
577 memset(&info, 0, sizeof(info));
578
579 set_fs(KERNEL_DS);
580 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
581 uru ? (struct rusage __user *)&ru : NULL);
582 set_fs(old_fs);
583
584 if ((ret < 0) || (info.si_signo == 0))
585 return ret;
586
587 if (uru) {
588 /* sys_waitid() overwrites everything in ru */
589 if (COMPAT_USE_64BIT_TIME)
590 ret = copy_to_user(uru, &ru, sizeof(ru));
591 else
592 ret = put_compat_rusage(&ru, uru);
593 if (ret)
594 return -EFAULT;
595 }
596
597 BUG_ON(info.si_code & __SI_MASK);
598 info.si_code |= __SI_CHLD;
599 return copy_siginfo_to_user32(uinfo, &info);
600 }
601
602 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
603 unsigned len, struct cpumask *new_mask)
604 {
605 unsigned long *k;
606
607 if (len < cpumask_size())
608 memset(new_mask, 0, cpumask_size());
609 else if (len > cpumask_size())
610 len = cpumask_size();
611
612 k = cpumask_bits(new_mask);
613 return compat_get_bitmap(k, user_mask_ptr, len * 8);
614 }
615
616 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
617 unsigned int, len,
618 compat_ulong_t __user *, user_mask_ptr)
619 {
620 cpumask_var_t new_mask;
621 int retval;
622
623 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
624 return -ENOMEM;
625
626 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
627 if (retval)
628 goto out;
629
630 retval = sched_setaffinity(pid, new_mask);
631 out:
632 free_cpumask_var(new_mask);
633 return retval;
634 }
635
636 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
637 compat_ulong_t __user *, user_mask_ptr)
638 {
639 int ret;
640 cpumask_var_t mask;
641
642 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
643 return -EINVAL;
644 if (len & (sizeof(compat_ulong_t)-1))
645 return -EINVAL;
646
647 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
648 return -ENOMEM;
649
650 ret = sched_getaffinity(pid, mask);
651 if (ret == 0) {
652 size_t retlen = min_t(size_t, len, cpumask_size());
653
654 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
655 ret = -EFAULT;
656 else
657 ret = retlen;
658 }
659 free_cpumask_var(mask);
660
661 return ret;
662 }
663
664 int get_compat_itimerspec(struct itimerspec *dst,
665 const struct compat_itimerspec __user *src)
666 {
667 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
668 __compat_get_timespec(&dst->it_value, &src->it_value))
669 return -EFAULT;
670 return 0;
671 }
672
673 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
674 const struct itimerspec *src)
675 {
676 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
677 __compat_put_timespec(&src->it_value, &dst->it_value))
678 return -EFAULT;
679 return 0;
680 }
681
682 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
683 struct compat_sigevent __user *, timer_event_spec,
684 timer_t __user *, created_timer_id)
685 {
686 struct sigevent __user *event = NULL;
687
688 if (timer_event_spec) {
689 struct sigevent kevent;
690
691 event = compat_alloc_user_space(sizeof(*event));
692 if (get_compat_sigevent(&kevent, timer_event_spec) ||
693 copy_to_user(event, &kevent, sizeof(*event)))
694 return -EFAULT;
695 }
696
697 return sys_timer_create(which_clock, event, created_timer_id);
698 }
699
700 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
701 struct compat_itimerspec __user *, new,
702 struct compat_itimerspec __user *, old)
703 {
704 long err;
705 mm_segment_t oldfs;
706 struct itimerspec newts, oldts;
707
708 if (!new)
709 return -EINVAL;
710 if (get_compat_itimerspec(&newts, new))
711 return -EFAULT;
712 oldfs = get_fs();
713 set_fs(KERNEL_DS);
714 err = sys_timer_settime(timer_id, flags,
715 (struct itimerspec __user *) &newts,
716 (struct itimerspec __user *) &oldts);
717 set_fs(oldfs);
718 if (!err && old && put_compat_itimerspec(old, &oldts))
719 return -EFAULT;
720 return err;
721 }
722
723 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
724 struct compat_itimerspec __user *, setting)
725 {
726 long err;
727 mm_segment_t oldfs;
728 struct itimerspec ts;
729
730 oldfs = get_fs();
731 set_fs(KERNEL_DS);
732 err = sys_timer_gettime(timer_id,
733 (struct itimerspec __user *) &ts);
734 set_fs(oldfs);
735 if (!err && put_compat_itimerspec(setting, &ts))
736 return -EFAULT;
737 return err;
738 }
739
740 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
741 struct compat_timespec __user *, tp)
742 {
743 long err;
744 mm_segment_t oldfs;
745 struct timespec ts;
746
747 if (compat_get_timespec(&ts, tp))
748 return -EFAULT;
749 oldfs = get_fs();
750 set_fs(KERNEL_DS);
751 err = sys_clock_settime(which_clock,
752 (struct timespec __user *) &ts);
753 set_fs(oldfs);
754 return err;
755 }
756
757 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
758 struct compat_timespec __user *, tp)
759 {
760 long err;
761 mm_segment_t oldfs;
762 struct timespec ts;
763
764 oldfs = get_fs();
765 set_fs(KERNEL_DS);
766 err = sys_clock_gettime(which_clock,
767 (struct timespec __user *) &ts);
768 set_fs(oldfs);
769 if (!err && compat_put_timespec(&ts, tp))
770 return -EFAULT;
771 return err;
772 }
773
774 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
775 struct compat_timex __user *, utp)
776 {
777 struct timex txc;
778 mm_segment_t oldfs;
779 int err, ret;
780
781 err = compat_get_timex(&txc, utp);
782 if (err)
783 return err;
784
785 oldfs = get_fs();
786 set_fs(KERNEL_DS);
787 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
788 set_fs(oldfs);
789
790 err = compat_put_timex(utp, &txc);
791 if (err)
792 return err;
793
794 return ret;
795 }
796
797 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
798 struct compat_timespec __user *, tp)
799 {
800 long err;
801 mm_segment_t oldfs;
802 struct timespec ts;
803
804 oldfs = get_fs();
805 set_fs(KERNEL_DS);
806 err = sys_clock_getres(which_clock,
807 (struct timespec __user *) &ts);
808 set_fs(oldfs);
809 if (!err && tp && compat_put_timespec(&ts, tp))
810 return -EFAULT;
811 return err;
812 }
813
814 static long compat_clock_nanosleep_restart(struct restart_block *restart)
815 {
816 long err;
817 mm_segment_t oldfs;
818 struct timespec tu;
819 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
820
821 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
822 oldfs = get_fs();
823 set_fs(KERNEL_DS);
824 err = clock_nanosleep_restart(restart);
825 set_fs(oldfs);
826
827 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
828 compat_put_timespec(&tu, rmtp))
829 return -EFAULT;
830
831 if (err == -ERESTART_RESTARTBLOCK) {
832 restart->fn = compat_clock_nanosleep_restart;
833 restart->nanosleep.compat_rmtp = rmtp;
834 }
835 return err;
836 }
837
838 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
839 struct compat_timespec __user *, rqtp,
840 struct compat_timespec __user *, rmtp)
841 {
842 long err;
843 mm_segment_t oldfs;
844 struct timespec in, out;
845 struct restart_block *restart;
846
847 if (compat_get_timespec(&in, rqtp))
848 return -EFAULT;
849
850 oldfs = get_fs();
851 set_fs(KERNEL_DS);
852 err = sys_clock_nanosleep(which_clock, flags,
853 (struct timespec __user *) &in,
854 (struct timespec __user *) &out);
855 set_fs(oldfs);
856
857 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
858 compat_put_timespec(&out, rmtp))
859 return -EFAULT;
860
861 if (err == -ERESTART_RESTARTBLOCK) {
862 restart = &current->restart_block;
863 restart->fn = compat_clock_nanosleep_restart;
864 restart->nanosleep.compat_rmtp = rmtp;
865 }
866 return err;
867 }
868
869 /*
870 * We currently only need the following fields from the sigevent
871 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
872 * sigev_notify_thread_id). The others are handled in user mode.
873 * We also assume that copying sigev_value.sival_int is sufficient
874 * to keep all the bits of sigev_value.sival_ptr intact.
875 */
876 int get_compat_sigevent(struct sigevent *event,
877 const struct compat_sigevent __user *u_event)
878 {
879 memset(event, 0, sizeof(*event));
880 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
881 __get_user(event->sigev_value.sival_int,
882 &u_event->sigev_value.sival_int) ||
883 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
884 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
885 __get_user(event->sigev_notify_thread_id,
886 &u_event->sigev_notify_thread_id))
887 ? -EFAULT : 0;
888 }
889
890 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
891 unsigned long bitmap_size)
892 {
893 int i, j;
894 unsigned long m;
895 compat_ulong_t um;
896 unsigned long nr_compat_longs;
897
898 /* align bitmap up to nearest compat_long_t boundary */
899 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
900
901 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
902 return -EFAULT;
903
904 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
905
906 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
907 m = 0;
908
909 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
910 /*
911 * We dont want to read past the end of the userspace
912 * bitmap. We must however ensure the end of the
913 * kernel bitmap is zeroed.
914 */
915 if (nr_compat_longs) {
916 nr_compat_longs--;
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) {
959 nr_compat_longs--;
960 if (__put_user(um, umask))
961 return -EFAULT;
962 }
963
964 umask++;
965 m >>= 4*sizeof(um);
966 m >>= 4*sizeof(um);
967 }
968 }
969
970 return 0;
971 }
972
973 void
974 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
975 {
976 switch (_NSIG_WORDS) {
977 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
978 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
979 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
980 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
981 }
982 }
983 EXPORT_SYMBOL_GPL(sigset_from_compat);
984
985 void
986 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
987 {
988 switch (_NSIG_WORDS) {
989 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
990 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
991 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
992 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
993 }
994 }
995
996 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
997 struct compat_siginfo __user *, uinfo,
998 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
999 {
1000 compat_sigset_t s32;
1001 sigset_t s;
1002 struct timespec t;
1003 siginfo_t info;
1004 long ret;
1005
1006 if (sigsetsize != sizeof(sigset_t))
1007 return -EINVAL;
1008
1009 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1010 return -EFAULT;
1011 sigset_from_compat(&s, &s32);
1012
1013 if (uts) {
1014 if (compat_get_timespec(&t, uts))
1015 return -EFAULT;
1016 }
1017
1018 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1019
1020 if (ret > 0 && uinfo) {
1021 if (copy_siginfo_to_user32(uinfo, &info))
1022 ret = -EFAULT;
1023 }
1024
1025 return ret;
1026 }
1027
1028 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1029
1030 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1031
1032 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1033 {
1034 compat_time_t i;
1035 struct timeval tv;
1036
1037 do_gettimeofday(&tv);
1038 i = tv.tv_sec;
1039
1040 if (tloc) {
1041 if (put_user(i,tloc))
1042 return -EFAULT;
1043 }
1044 force_successful_syscall_return();
1045 return i;
1046 }
1047
1048 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1049 {
1050 struct timespec tv;
1051 int err;
1052
1053 if (get_user(tv.tv_sec, tptr))
1054 return -EFAULT;
1055
1056 tv.tv_nsec = 0;
1057
1058 err = security_settime(&tv, NULL);
1059 if (err)
1060 return err;
1061
1062 do_settimeofday(&tv);
1063 return 0;
1064 }
1065
1066 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1067
1068 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1069 {
1070 struct timex txc;
1071 int err, ret;
1072
1073 err = compat_get_timex(&txc, utp);
1074 if (err)
1075 return err;
1076
1077 ret = do_adjtimex(&txc);
1078
1079 err = compat_put_timex(utp, &txc);
1080 if (err)
1081 return err;
1082
1083 return ret;
1084 }
1085
1086 #ifdef CONFIG_NUMA
1087 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1088 compat_uptr_t __user *, pages32,
1089 const int __user *, nodes,
1090 int __user *, status,
1091 int, flags)
1092 {
1093 const void __user * __user *pages;
1094 int i;
1095
1096 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1097 for (i = 0; i < nr_pages; i++) {
1098 compat_uptr_t p;
1099
1100 if (get_user(p, pages32 + i) ||
1101 put_user(compat_ptr(p), pages + i))
1102 return -EFAULT;
1103 }
1104 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1105 }
1106
1107 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1108 compat_ulong_t, maxnode,
1109 const compat_ulong_t __user *, old_nodes,
1110 const compat_ulong_t __user *, new_nodes)
1111 {
1112 unsigned long __user *old = NULL;
1113 unsigned long __user *new = NULL;
1114 nodemask_t tmp_mask;
1115 unsigned long nr_bits;
1116 unsigned long size;
1117
1118 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1119 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1120 if (old_nodes) {
1121 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1122 return -EFAULT;
1123 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1124 if (new_nodes)
1125 new = old + size / sizeof(unsigned long);
1126 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1127 return -EFAULT;
1128 }
1129 if (new_nodes) {
1130 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1131 return -EFAULT;
1132 if (new == NULL)
1133 new = compat_alloc_user_space(size);
1134 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1135 return -EFAULT;
1136 }
1137 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1138 }
1139 #endif
1140
1141 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1142 compat_pid_t, pid,
1143 struct compat_timespec __user *, interval)
1144 {
1145 struct timespec t;
1146 int ret;
1147 mm_segment_t old_fs = get_fs();
1148
1149 set_fs(KERNEL_DS);
1150 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1151 set_fs(old_fs);
1152 if (compat_put_timespec(&t, interval))
1153 return -EFAULT;
1154 return ret;
1155 }
1156
1157 /*
1158 * Allocate user-space memory for the duration of a single system call,
1159 * in order to marshall parameters inside a compat thunk.
1160 */
1161 void __user *compat_alloc_user_space(unsigned long len)
1162 {
1163 void __user *ptr;
1164
1165 /* If len would occupy more than half of the entire compat space... */
1166 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1167 return NULL;
1168
1169 ptr = arch_compat_alloc_user_space(len);
1170
1171 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1172 return NULL;
1173
1174 return ptr;
1175 }
1176 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
Linux with added FPC-III support