projects/linux·blob v3.0-rc5 · refs

1164 lines · 28.4 KiB

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/migrate.h>
25#include <linux/posix-timers.h>
26#include <linux/times.h>
27#include <linux/ptrace.h>
28#include <linux/gfp.h>
29
30#include <asm/uaccess.h>
31
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
55static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
56{
57 memset(txc, 0, sizeof(struct timex));
58
59 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
60 __get_user(txc->modes, &utp->modes) ||
61 __get_user(txc->offset, &utp->offset) ||
62 __get_user(txc->freq, &utp->freq) ||
63 __get_user(txc->maxerror, &utp->maxerror) ||
64 __get_user(txc->esterror, &utp->esterror) ||
65 __get_user(txc->status, &utp->status) ||
66 __get_user(txc->constant, &utp->constant) ||
67 __get_user(txc->precision, &utp->precision) ||
68 __get_user(txc->tolerance, &utp->tolerance) ||
69 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
70 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
71 __get_user(txc->tick, &utp->tick) ||
72 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
73 __get_user(txc->jitter, &utp->jitter) ||
74 __get_user(txc->shift, &utp->shift) ||
75 __get_user(txc->stabil, &utp->stabil) ||
76 __get_user(txc->jitcnt, &utp->jitcnt) ||
77 __get_user(txc->calcnt, &utp->calcnt) ||
78 __get_user(txc->errcnt, &utp->errcnt) ||
79 __get_user(txc->stbcnt, &utp->stbcnt))
80 return -EFAULT;
81
82 return 0;
83}
84
85static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
86{
87 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
88 __put_user(txc->modes, &utp->modes) ||
89 __put_user(txc->offset, &utp->offset) ||
90 __put_user(txc->freq, &utp->freq) ||
91 __put_user(txc->maxerror, &utp->maxerror) ||
92 __put_user(txc->esterror, &utp->esterror) ||
93 __put_user(txc->status, &utp->status) ||
94 __put_user(txc->constant, &utp->constant) ||
95 __put_user(txc->precision, &utp->precision) ||
96 __put_user(txc->tolerance, &utp->tolerance) ||
97 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
98 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
99 __put_user(txc->tick, &utp->tick) ||
100 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
101 __put_user(txc->jitter, &utp->jitter) ||
102 __put_user(txc->shift, &utp->shift) ||
103 __put_user(txc->stabil, &utp->stabil) ||
104 __put_user(txc->jitcnt, &utp->jitcnt) ||
105 __put_user(txc->calcnt, &utp->calcnt) ||
106 __put_user(txc->errcnt, &utp->errcnt) ||
107 __put_user(txc->stbcnt, &utp->stbcnt) ||
108 __put_user(txc->tai, &utp->tai))
109 return -EFAULT;
110 return 0;
111}
112
113asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
114 struct timezone __user *tz)
115{
116 if (tv) {
117 struct timeval ktv;
118 do_gettimeofday(&ktv);
119 if (compat_put_timeval(tv, &ktv))
120 return -EFAULT;
121 }
122 if (tz) {
123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
124 return -EFAULT;
125 }
126
127 return 0;
128}
129
130asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
131 struct timezone __user *tz)
132{
133 struct timespec kts;
134 struct timezone ktz;
135
136 if (tv) {
137 if (compat_get_timeval(&kts, tv))
138 return -EFAULT;
139 }
140 if (tz) {
141 if (copy_from_user(&ktz, tz, sizeof(ktz)))
142 return -EFAULT;
143 }
144
145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
146}
147
148int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
149{
150 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
151 __get_user(ts->tv_sec, &cts->tv_sec) ||
152 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
153}
154
155int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
156{
157 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
158 __put_user(ts->tv_sec, &cts->tv_sec) ||
159 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
160}
161
162static long compat_nanosleep_restart(struct restart_block *restart)
163{
164 struct compat_timespec __user *rmtp;
165 struct timespec rmt;
166 mm_segment_t oldfs;
167 long ret;
168
169 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
170 oldfs = get_fs();
171 set_fs(KERNEL_DS);
172 ret = hrtimer_nanosleep_restart(restart);
173 set_fs(oldfs);
174
175 if (ret) {
176 rmtp = restart->nanosleep.compat_rmtp;
177
178 if (rmtp && put_compat_timespec(&rmt, rmtp))
179 return -EFAULT;
180 }
181
182 return ret;
183}
184
185asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
186 struct compat_timespec __user *rmtp)
187{
188 struct timespec tu, rmt;
189 mm_segment_t oldfs;
190 long ret;
191
192 if (get_compat_timespec(&tu, rqtp))
193 return -EFAULT;
194
195 if (!timespec_valid(&tu))
196 return -EINVAL;
197
198 oldfs = get_fs();
199 set_fs(KERNEL_DS);
200 ret = hrtimer_nanosleep(&tu,
201 rmtp ? (struct timespec __user *)&rmt : NULL,
202 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
203 set_fs(oldfs);
204
205 if (ret) {
206 struct restart_block *restart
207 = &current_thread_info()->restart_block;
208
209 restart->fn = compat_nanosleep_restart;
210 restart->nanosleep.compat_rmtp = rmtp;
211
212 if (rmtp && put_compat_timespec(&rmt, rmtp))
213 return -EFAULT;
214 }
215
216 return ret;
217}
218
219static inline long get_compat_itimerval(struct itimerval *o,
220 struct compat_itimerval __user *i)
221{
222 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
223 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
224 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
225 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
226 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
227}
228
229static inline long put_compat_itimerval(struct compat_itimerval __user *o,
230 struct itimerval *i)
231{
232 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
233 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
234 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
235 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
236 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
237}
238
239asmlinkage long compat_sys_getitimer(int which,
240 struct compat_itimerval __user *it)
241{
242 struct itimerval kit;
243 int error;
244
245 error = do_getitimer(which, &kit);
246 if (!error && put_compat_itimerval(it, &kit))
247 error = -EFAULT;
248 return error;
249}
250
251asmlinkage long compat_sys_setitimer(int which,
252 struct compat_itimerval __user *in,
253 struct compat_itimerval __user *out)
254{
255 struct itimerval kin, kout;
256 int error;
257
258 if (in) {
259 if (get_compat_itimerval(&kin, in))
260 return -EFAULT;
261 } else
262 memset(&kin, 0, sizeof(kin));
263
264 error = do_setitimer(which, &kin, out ? &kout : NULL);
265 if (error || !out)
266 return error;
267 if (put_compat_itimerval(out, &kout))
268 return -EFAULT;
269 return 0;
270}
271
272static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
273{
274 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
275}
276
277asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
278{
279 if (tbuf) {
280 struct tms tms;
281 struct compat_tms tmp;
282
283 do_sys_times(&tms);
284 /* Convert our struct tms to the compat version. */
285 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
286 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
287 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
288 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
289 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
290 return -EFAULT;
291 }
292 force_successful_syscall_return();
293 return compat_jiffies_to_clock_t(jiffies);
294}
295
296#ifdef __ARCH_WANT_SYS_SIGPENDING
297
298/*
299 * Assumption: old_sigset_t and compat_old_sigset_t are both
300 * types that can be passed to put_user()/get_user().
301 */
302
303asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
304{
305 old_sigset_t s;
306 long ret;
307 mm_segment_t old_fs = get_fs();
308
309 set_fs(KERNEL_DS);
310 ret = sys_sigpending((old_sigset_t __user *) &s);
311 set_fs(old_fs);
312 if (ret == 0)
313 ret = put_user(s, set);
314 return ret;
315}
316
317#endif
318
319#ifdef __ARCH_WANT_SYS_SIGPROCMASK
320
321asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
322 compat_old_sigset_t __user *oset)
323{
324 old_sigset_t s;
325 long ret;
326 mm_segment_t old_fs;
327
328 if (set && get_user(s, set))
329 return -EFAULT;
330 old_fs = get_fs();
331 set_fs(KERNEL_DS);
332 ret = sys_sigprocmask(how,
333 set ? (old_sigset_t __user *) &s : NULL,
334 oset ? (old_sigset_t __user *) &s : NULL);
335 set_fs(old_fs);
336 if (ret == 0)
337 if (oset)
338 ret = put_user(s, oset);
339 return ret;
340}
341
342#endif
343
344asmlinkage long compat_sys_setrlimit(unsigned int resource,
345 struct compat_rlimit __user *rlim)
346{
347 struct rlimit r;
348
349 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
350 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
351 __get_user(r.rlim_max, &rlim->rlim_max))
352 return -EFAULT;
353
354 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
355 r.rlim_cur = RLIM_INFINITY;
356 if (r.rlim_max == COMPAT_RLIM_INFINITY)
357 r.rlim_max = RLIM_INFINITY;
358 return do_prlimit(current, resource, &r, NULL);
359}
360
361#ifdef COMPAT_RLIM_OLD_INFINITY
362
363asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
364 struct compat_rlimit __user *rlim)
365{
366 struct rlimit r;
367 int ret;
368 mm_segment_t old_fs = get_fs();
369
370 set_fs(KERNEL_DS);
371 ret = sys_old_getrlimit(resource, &r);
372 set_fs(old_fs);
373
374 if (!ret) {
375 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
376 r.rlim_cur = COMPAT_RLIM_INFINITY;
377 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
378 r.rlim_max = COMPAT_RLIM_INFINITY;
379
380 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
381 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
382 __put_user(r.rlim_max, &rlim->rlim_max))
383 return -EFAULT;
384 }
385 return ret;
386}
387
388#endif
389
390asmlinkage long compat_sys_getrlimit(unsigned int resource,
391 struct compat_rlimit __user *rlim)
392{
393 struct rlimit r;
394 int ret;
395
396 ret = do_prlimit(current, resource, NULL, &r);
397 if (!ret) {
398 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
399 r.rlim_cur = COMPAT_RLIM_INFINITY;
400 if (r.rlim_max > COMPAT_RLIM_INFINITY)
401 r.rlim_max = COMPAT_RLIM_INFINITY;
402
403 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
404 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
405 __put_user(r.rlim_max, &rlim->rlim_max))
406 return -EFAULT;
407 }
408 return ret;
409}
410
411int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
412{
413 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
414 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
415 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
416 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
417 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
418 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
419 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
420 __put_user(r->ru_idrss, &ru->ru_idrss) ||
421 __put_user(r->ru_isrss, &ru->ru_isrss) ||
422 __put_user(r->ru_minflt, &ru->ru_minflt) ||
423 __put_user(r->ru_majflt, &ru->ru_majflt) ||
424 __put_user(r->ru_nswap, &ru->ru_nswap) ||
425 __put_user(r->ru_inblock, &ru->ru_inblock) ||
426 __put_user(r->ru_oublock, &ru->ru_oublock) ||
427 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
428 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
429 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
430 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
431 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
432 return -EFAULT;
433 return 0;
434}
435
436asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
437{
438 struct rusage r;
439 int ret;
440 mm_segment_t old_fs = get_fs();
441
442 set_fs(KERNEL_DS);
443 ret = sys_getrusage(who, (struct rusage __user *) &r);
444 set_fs(old_fs);
445
446 if (ret)
447 return ret;
448
449 if (put_compat_rusage(&r, ru))
450 return -EFAULT;
451
452 return 0;
453}
454
455asmlinkage long
456compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
457 struct compat_rusage __user *ru)
458{
459 if (!ru) {
460 return sys_wait4(pid, stat_addr, options, NULL);
461 } else {
462 struct rusage r;
463 int ret;
464 unsigned int status;
465 mm_segment_t old_fs = get_fs();
466
467 set_fs (KERNEL_DS);
468 ret = sys_wait4(pid,
469 (stat_addr ?
470 (unsigned int __user *) &status : NULL),
471 options, (struct rusage __user *) &r);
472 set_fs (old_fs);
473
474 if (ret > 0) {
475 if (put_compat_rusage(&r, ru))
476 return -EFAULT;
477 if (stat_addr && put_user(status, stat_addr))
478 return -EFAULT;
479 }
480 return ret;
481 }
482}
483
484asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
485 struct compat_siginfo __user *uinfo, int options,
486 struct compat_rusage __user *uru)
487{
488 siginfo_t info;
489 struct rusage ru;
490 long ret;
491 mm_segment_t old_fs = get_fs();
492
493 memset(&info, 0, sizeof(info));
494
495 set_fs(KERNEL_DS);
496 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
497 uru ? (struct rusage __user *)&ru : NULL);
498 set_fs(old_fs);
499
500 if ((ret < 0) || (info.si_signo == 0))
501 return ret;
502
503 if (uru) {
504 ret = put_compat_rusage(&ru, uru);
505 if (ret)
506 return ret;
507 }
508
509 BUG_ON(info.si_code & __SI_MASK);
510 info.si_code |= __SI_CHLD;
511 return copy_siginfo_to_user32(uinfo, &info);
512}
513
514static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
515 unsigned len, struct cpumask *new_mask)
516{
517 unsigned long *k;
518
519 if (len < cpumask_size())
520 memset(new_mask, 0, cpumask_size());
521 else if (len > cpumask_size())
522 len = cpumask_size();
523
524 k = cpumask_bits(new_mask);
525 return compat_get_bitmap(k, user_mask_ptr, len * 8);
526}
527
528asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
529 unsigned int len,
530 compat_ulong_t __user *user_mask_ptr)
531{
532 cpumask_var_t new_mask;
533 int retval;
534
535 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
536 return -ENOMEM;
537
538 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
539 if (retval)
540 goto out;
541
542 retval = sched_setaffinity(pid, new_mask);
543out:
544 free_cpumask_var(new_mask);
545 return retval;
546}
547
548asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
549 compat_ulong_t __user *user_mask_ptr)
550{
551 int ret;
552 cpumask_var_t mask;
553
554 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
555 return -EINVAL;
556 if (len & (sizeof(compat_ulong_t)-1))
557 return -EINVAL;
558
559 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
560 return -ENOMEM;
561
562 ret = sched_getaffinity(pid, mask);
563 if (ret == 0) {
564 size_t retlen = min_t(size_t, len, cpumask_size());
565
566 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
567 ret = -EFAULT;
568 else
569 ret = retlen;
570 }
571 free_cpumask_var(mask);
572
573 return ret;
574}
575
576int get_compat_itimerspec(struct itimerspec *dst,
577 const struct compat_itimerspec __user *src)
578{
579 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
580 get_compat_timespec(&dst->it_value, &src->it_value))
581 return -EFAULT;
582 return 0;
583}
584
585int put_compat_itimerspec(struct compat_itimerspec __user *dst,
586 const struct itimerspec *src)
587{
588 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
589 put_compat_timespec(&src->it_value, &dst->it_value))
590 return -EFAULT;
591 return 0;
592}
593
594long compat_sys_timer_create(clockid_t which_clock,
595 struct compat_sigevent __user *timer_event_spec,
596 timer_t __user *created_timer_id)
597{
598 struct sigevent __user *event = NULL;
599
600 if (timer_event_spec) {
601 struct sigevent kevent;
602
603 event = compat_alloc_user_space(sizeof(*event));
604 if (get_compat_sigevent(&kevent, timer_event_spec) ||
605 copy_to_user(event, &kevent, sizeof(*event)))
606 return -EFAULT;
607 }
608
609 return sys_timer_create(which_clock, event, created_timer_id);
610}
611
612long compat_sys_timer_settime(timer_t timer_id, int flags,
613 struct compat_itimerspec __user *new,
614 struct compat_itimerspec __user *old)
615{
616 long err;
617 mm_segment_t oldfs;
618 struct itimerspec newts, oldts;
619
620 if (!new)
621 return -EINVAL;
622 if (get_compat_itimerspec(&newts, new))
623 return -EFAULT;
624 oldfs = get_fs();
625 set_fs(KERNEL_DS);
626 err = sys_timer_settime(timer_id, flags,
627 (struct itimerspec __user *) &newts,
628 (struct itimerspec __user *) &oldts);
629 set_fs(oldfs);
630 if (!err && old && put_compat_itimerspec(old, &oldts))
631 return -EFAULT;
632 return err;
633}
634
635long compat_sys_timer_gettime(timer_t timer_id,
636 struct compat_itimerspec __user *setting)
637{
638 long err;
639 mm_segment_t oldfs;
640 struct itimerspec ts;
641
642 oldfs = get_fs();
643 set_fs(KERNEL_DS);
644 err = sys_timer_gettime(timer_id,
645 (struct itimerspec __user *) &ts);
646 set_fs(oldfs);
647 if (!err && put_compat_itimerspec(setting, &ts))
648 return -EFAULT;
649 return err;
650}
651
652long compat_sys_clock_settime(clockid_t which_clock,
653 struct compat_timespec __user *tp)
654{
655 long err;
656 mm_segment_t oldfs;
657 struct timespec ts;
658
659 if (get_compat_timespec(&ts, tp))
660 return -EFAULT;
661 oldfs = get_fs();
662 set_fs(KERNEL_DS);
663 err = sys_clock_settime(which_clock,
664 (struct timespec __user *) &ts);
665 set_fs(oldfs);
666 return err;
667}
668
669long compat_sys_clock_gettime(clockid_t which_clock,
670 struct compat_timespec __user *tp)
671{
672 long err;
673 mm_segment_t oldfs;
674 struct timespec ts;
675
676 oldfs = get_fs();
677 set_fs(KERNEL_DS);
678 err = sys_clock_gettime(which_clock,
679 (struct timespec __user *) &ts);
680 set_fs(oldfs);
681 if (!err && put_compat_timespec(&ts, tp))
682 return -EFAULT;
683 return err;
684}
685
686long compat_sys_clock_adjtime(clockid_t which_clock,
687 struct compat_timex __user *utp)
688{
689 struct timex txc;
690 mm_segment_t oldfs;
691 int err, ret;
692
693 err = compat_get_timex(&txc, utp);
694 if (err)
695 return err;
696
697 oldfs = get_fs();
698 set_fs(KERNEL_DS);
699 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
700 set_fs(oldfs);
701
702 err = compat_put_timex(utp, &txc);
703 if (err)
704 return err;
705
706 return ret;
707}
708
709long compat_sys_clock_getres(clockid_t which_clock,
710 struct compat_timespec __user *tp)
711{
712 long err;
713 mm_segment_t oldfs;
714 struct timespec ts;
715
716 oldfs = get_fs();
717 set_fs(KERNEL_DS);
718 err = sys_clock_getres(which_clock,
719 (struct timespec __user *) &ts);
720 set_fs(oldfs);
721 if (!err && tp && put_compat_timespec(&ts, tp))
722 return -EFAULT;
723 return err;
724}
725
726static long compat_clock_nanosleep_restart(struct restart_block *restart)
727{
728 long err;
729 mm_segment_t oldfs;
730 struct timespec tu;
731 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
732
733 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
734 oldfs = get_fs();
735 set_fs(KERNEL_DS);
736 err = clock_nanosleep_restart(restart);
737 set_fs(oldfs);
738
739 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
740 put_compat_timespec(&tu, rmtp))
741 return -EFAULT;
742
743 if (err == -ERESTART_RESTARTBLOCK) {
744 restart->fn = compat_clock_nanosleep_restart;
745 restart->nanosleep.compat_rmtp = rmtp;
746 }
747 return err;
748}
749
750long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
751 struct compat_timespec __user *rqtp,
752 struct compat_timespec __user *rmtp)
753{
754 long err;
755 mm_segment_t oldfs;
756 struct timespec in, out;
757 struct restart_block *restart;
758
759 if (get_compat_timespec(&in, rqtp))
760 return -EFAULT;
761
762 oldfs = get_fs();
763 set_fs(KERNEL_DS);
764 err = sys_clock_nanosleep(which_clock, flags,
765 (struct timespec __user *) &in,
766 (struct timespec __user *) &out);
767 set_fs(oldfs);
768
769 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
770 put_compat_timespec(&out, rmtp))
771 return -EFAULT;
772
773 if (err == -ERESTART_RESTARTBLOCK) {
774 restart = &current_thread_info()->restart_block;
775 restart->fn = compat_clock_nanosleep_restart;
776 restart->nanosleep.compat_rmtp = rmtp;
777 }
778 return err;
779}
780
781/*
782 * We currently only need the following fields from the sigevent
783 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
784 * sigev_notify_thread_id). The others are handled in user mode.
785 * We also assume that copying sigev_value.sival_int is sufficient
786 * to keep all the bits of sigev_value.sival_ptr intact.
787 */
788int get_compat_sigevent(struct sigevent *event,
789 const struct compat_sigevent __user *u_event)
790{
791 memset(event, 0, sizeof(*event));
792 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
793 __get_user(event->sigev_value.sival_int,
794 &u_event->sigev_value.sival_int) ||
795 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
796 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
797 __get_user(event->sigev_notify_thread_id,
798 &u_event->sigev_notify_thread_id))
799 ? -EFAULT : 0;
800}
801
802long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
803 unsigned long bitmap_size)
804{
805 int i, j;
806 unsigned long m;
807 compat_ulong_t um;
808 unsigned long nr_compat_longs;
809
810 /* align bitmap up to nearest compat_long_t boundary */
811 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
812
813 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
814 return -EFAULT;
815
816 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
817
818 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
819 m = 0;
820
821 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
822 /*
823 * We dont want to read past the end of the userspace
824 * bitmap. We must however ensure the end of the
825 * kernel bitmap is zeroed.
826 */
827 if (nr_compat_longs-- > 0) {
828 if (__get_user(um, umask))
829 return -EFAULT;
830 } else {
831 um = 0;
832 }
833
834 umask++;
835 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
836 }
837 *mask++ = m;
838 }
839
840 return 0;
841}
842
843long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
844 unsigned long bitmap_size)
845{
846 int i, j;
847 unsigned long m;
848 compat_ulong_t um;
849 unsigned long nr_compat_longs;
850
851 /* align bitmap up to nearest compat_long_t boundary */
852 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
853
854 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
855 return -EFAULT;
856
857 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
858
859 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
860 m = *mask++;
861
862 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
863 um = m;
864
865 /*
866 * We dont want to write past the end of the userspace
867 * bitmap.
868 */
869 if (nr_compat_longs-- > 0) {
870 if (__put_user(um, umask))
871 return -EFAULT;
872 }
873
874 umask++;
875 m >>= 4*sizeof(um);
876 m >>= 4*sizeof(um);
877 }
878 }
879
880 return 0;
881}
882
883void
884sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
885{
886 switch (_NSIG_WORDS) {
887 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
888 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
889 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
890 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
891 }
892}
893
894asmlinkage long
895compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
896 struct compat_siginfo __user *uinfo,
897 struct compat_timespec __user *uts, compat_size_t sigsetsize)
898{
899 compat_sigset_t s32;
900 sigset_t s;
901 struct timespec t;
902 siginfo_t info;
903 long ret;
904
905 if (sigsetsize != sizeof(sigset_t))
906 return -EINVAL;
907
908 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
909 return -EFAULT;
910 sigset_from_compat(&s, &s32);
911
912 if (uts) {
913 if (get_compat_timespec(&t, uts))
914 return -EFAULT;
915 }
916
917 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
918
919 if (ret > 0 && uinfo) {
920 if (copy_siginfo_to_user32(uinfo, &info))
921 ret = -EFAULT;
922 }
923
924 return ret;
925
926}
927
928asmlinkage long
929compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
930 struct compat_siginfo __user *uinfo)
931{
932 siginfo_t info;
933
934 if (copy_siginfo_from_user32(&info, uinfo))
935 return -EFAULT;
936 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
937}
938
939#ifdef __ARCH_WANT_COMPAT_SYS_TIME
940
941/* compat_time_t is a 32 bit "long" and needs to get converted. */
942
943asmlinkage long compat_sys_time(compat_time_t __user * tloc)
944{
945 compat_time_t i;
946 struct timeval tv;
947
948 do_gettimeofday(&tv);
949 i = tv.tv_sec;
950
951 if (tloc) {
952 if (put_user(i,tloc))
953 return -EFAULT;
954 }
955 force_successful_syscall_return();
956 return i;
957}
958
959asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
960{
961 struct timespec tv;
962 int err;
963
964 if (get_user(tv.tv_sec, tptr))
965 return -EFAULT;
966
967 tv.tv_nsec = 0;
968
969 err = security_settime(&tv, NULL);
970 if (err)
971 return err;
972
973 do_settimeofday(&tv);
974 return 0;
975}
976
977#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
978
979#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
980asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
981{
982 sigset_t newset;
983 compat_sigset_t newset32;
984
985 /* XXX: Don't preclude handling different sized sigset_t's. */
986 if (sigsetsize != sizeof(sigset_t))
987 return -EINVAL;
988
989 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
990 return -EFAULT;
991 sigset_from_compat(&newset, &newset32);
992 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
993
994 spin_lock_irq(&current->sighand->siglock);
995 current->saved_sigmask = current->blocked;
996 current->blocked = newset;
997 recalc_sigpending();
998 spin_unlock_irq(&current->sighand->siglock);
999
1000 current->state = TASK_INTERRUPTIBLE;
1001 schedule();
1002 set_restore_sigmask();
1003 return -ERESTARTNOHAND;
1004}
1005#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1006
1007asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1008{
1009 struct timex txc;
1010 int err, ret;
1011
1012 err = compat_get_timex(&txc, utp);
1013 if (err)
1014 return err;
1015
1016 ret = do_adjtimex(&txc);
1017
1018 err = compat_put_timex(utp, &txc);
1019 if (err)
1020 return err;
1021
1022 return ret;
1023}
1024
1025#ifdef CONFIG_NUMA
1026asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1027 compat_uptr_t __user *pages32,
1028 const int __user *nodes,
1029 int __user *status,
1030 int flags)
1031{
1032 const void __user * __user *pages;
1033 int i;
1034
1035 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1036 for (i = 0; i < nr_pages; i++) {
1037 compat_uptr_t p;
1038
1039 if (get_user(p, pages32 + i) ||
1040 put_user(compat_ptr(p), pages + i))
1041 return -EFAULT;
1042 }
1043 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1044}
1045
1046asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1047 compat_ulong_t maxnode,
1048 const compat_ulong_t __user *old_nodes,
1049 const compat_ulong_t __user *new_nodes)
1050{
1051 unsigned long __user *old = NULL;
1052 unsigned long __user *new = NULL;
1053 nodemask_t tmp_mask;
1054 unsigned long nr_bits;
1055 unsigned long size;
1056
1057 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1058 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1059 if (old_nodes) {
1060 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1061 return -EFAULT;
1062 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1063 if (new_nodes)
1064 new = old + size / sizeof(unsigned long);
1065 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1066 return -EFAULT;
1067 }
1068 if (new_nodes) {
1069 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1070 return -EFAULT;
1071 if (new == NULL)
1072 new = compat_alloc_user_space(size);
1073 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1074 return -EFAULT;
1075 }
1076 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1077}
1078#endif
1079
1080struct compat_sysinfo {
1081 s32 uptime;
1082 u32 loads[3];
1083 u32 totalram;
1084 u32 freeram;
1085 u32 sharedram;
1086 u32 bufferram;
1087 u32 totalswap;
1088 u32 freeswap;
1089 u16 procs;
1090 u16 pad;
1091 u32 totalhigh;
1092 u32 freehigh;
1093 u32 mem_unit;
1094 char _f[20-2*sizeof(u32)-sizeof(int)];
1095};
1096
1097asmlinkage long
1098compat_sys_sysinfo(struct compat_sysinfo __user *info)
1099{
1100 struct sysinfo s;
1101
1102 do_sysinfo(&s);
1103
1104 /* Check to see if any memory value is too large for 32-bit and scale
1105 * down if needed
1106 */
1107 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1108 int bitcount = 0;
1109
1110 while (s.mem_unit < PAGE_SIZE) {
1111 s.mem_unit <<= 1;
1112 bitcount++;
1113 }
1114
1115 s.totalram >>= bitcount;
1116 s.freeram >>= bitcount;
1117 s.sharedram >>= bitcount;
1118 s.bufferram >>= bitcount;
1119 s.totalswap >>= bitcount;
1120 s.freeswap >>= bitcount;
1121 s.totalhigh >>= bitcount;
1122 s.freehigh >>= bitcount;
1123 }
1124
1125 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1126 __put_user (s.uptime, &info->uptime) ||
1127 __put_user (s.loads[0], &info->loads[0]) ||
1128 __put_user (s.loads[1], &info->loads[1]) ||
1129 __put_user (s.loads[2], &info->loads[2]) ||
1130 __put_user (s.totalram, &info->totalram) ||
1131 __put_user (s.freeram, &info->freeram) ||
1132 __put_user (s.sharedram, &info->sharedram) ||
1133 __put_user (s.bufferram, &info->bufferram) ||
1134 __put_user (s.totalswap, &info->totalswap) ||
1135 __put_user (s.freeswap, &info->freeswap) ||
1136 __put_user (s.procs, &info->procs) ||
1137 __put_user (s.totalhigh, &info->totalhigh) ||
1138 __put_user (s.freehigh, &info->freehigh) ||
1139 __put_user (s.mem_unit, &info->mem_unit))
1140 return -EFAULT;
1141
1142 return 0;
1143}
1144
1145/*
1146 * Allocate user-space memory for the duration of a single system call,
1147 * in order to marshall parameters inside a compat thunk.
1148 */
1149void __user *compat_alloc_user_space(unsigned long len)
1150{
1151 void __user *ptr;
1152
1153 /* If len would occupy more than half of the entire compat space... */
1154 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1155 return NULL;
1156
1157 ptr = arch_compat_alloc_user_space(len);
1158
1159 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1160 return NULL;
1161
1162 return ptr;
1163}
1164EXPORT_SYMBOL_GPL(compat_alloc_user_space);