projects/linux·blob v2.6.24-rc5 · refs

1049 lines · 26.6 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
27#include <asm/uaccess.h>
28
29int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
30{
31 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
32 __get_user(ts->tv_sec, &cts->tv_sec) ||
33 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
34}
35
36int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
37{
38 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
39 __put_user(ts->tv_sec, &cts->tv_sec) ||
40 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
41}
42
43asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
44 struct compat_timespec __user *rmtp)
45{
46 struct timespec tu, rmt;
47 long ret;
48
49 if (get_compat_timespec(&tu, rqtp))
50 return -EFAULT;
51
52 if (!timespec_valid(&tu))
53 return -EINVAL;
54
55 ret = hrtimer_nanosleep(&tu, rmtp ? &rmt : NULL, HRTIMER_MODE_REL,
56 CLOCK_MONOTONIC);
57
58 if (ret && rmtp) {
59 if (put_compat_timespec(&rmt, rmtp))
60 return -EFAULT;
61 }
62
63 return ret;
64}
65
66static inline long get_compat_itimerval(struct itimerval *o,
67 struct compat_itimerval __user *i)
68{
69 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
70 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
71 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
72 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
73 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
74}
75
76static inline long put_compat_itimerval(struct compat_itimerval __user *o,
77 struct itimerval *i)
78{
79 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
80 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
81 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
82 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
83 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
84}
85
86asmlinkage long compat_sys_getitimer(int which,
87 struct compat_itimerval __user *it)
88{
89 struct itimerval kit;
90 int error;
91
92 error = do_getitimer(which, &kit);
93 if (!error && put_compat_itimerval(it, &kit))
94 error = -EFAULT;
95 return error;
96}
97
98asmlinkage long compat_sys_setitimer(int which,
99 struct compat_itimerval __user *in,
100 struct compat_itimerval __user *out)
101{
102 struct itimerval kin, kout;
103 int error;
104
105 if (in) {
106 if (get_compat_itimerval(&kin, in))
107 return -EFAULT;
108 } else
109 memset(&kin, 0, sizeof(kin));
110
111 error = do_setitimer(which, &kin, out ? &kout : NULL);
112 if (error || !out)
113 return error;
114 if (put_compat_itimerval(out, &kout))
115 return -EFAULT;
116 return 0;
117}
118
119asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
120{
121 /*
122 * In the SMP world we might just be unlucky and have one of
123 * the times increment as we use it. Since the value is an
124 * atomically safe type this is just fine. Conceptually its
125 * as if the syscall took an instant longer to occur.
126 */
127 if (tbuf) {
128 struct compat_tms tmp;
129 struct task_struct *tsk = current;
130 struct task_struct *t;
131 cputime_t utime, stime, cutime, cstime;
132
133 read_lock(&tasklist_lock);
134 utime = tsk->signal->utime;
135 stime = tsk->signal->stime;
136 t = tsk;
137 do {
138 utime = cputime_add(utime, t->utime);
139 stime = cputime_add(stime, t->stime);
140 t = next_thread(t);
141 } while (t != tsk);
142
143 /*
144 * While we have tasklist_lock read-locked, no dying thread
145 * can be updating current->signal->[us]time. Instead,
146 * we got their counts included in the live thread loop.
147 * However, another thread can come in right now and
148 * do a wait call that updates current->signal->c[us]time.
149 * To make sure we always see that pair updated atomically,
150 * we take the siglock around fetching them.
151 */
152 spin_lock_irq(&tsk->sighand->siglock);
153 cutime = tsk->signal->cutime;
154 cstime = tsk->signal->cstime;
155 spin_unlock_irq(&tsk->sighand->siglock);
156 read_unlock(&tasklist_lock);
157
158 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
159 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
160 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
161 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
162 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
163 return -EFAULT;
164 }
165 return compat_jiffies_to_clock_t(jiffies);
166}
167
168/*
169 * Assumption: old_sigset_t and compat_old_sigset_t are both
170 * types that can be passed to put_user()/get_user().
171 */
172
173asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
174{
175 old_sigset_t s;
176 long ret;
177 mm_segment_t old_fs = get_fs();
178
179 set_fs(KERNEL_DS);
180 ret = sys_sigpending((old_sigset_t __user *) &s);
181 set_fs(old_fs);
182 if (ret == 0)
183 ret = put_user(s, set);
184 return ret;
185}
186
187asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
188 compat_old_sigset_t __user *oset)
189{
190 old_sigset_t s;
191 long ret;
192 mm_segment_t old_fs;
193
194 if (set && get_user(s, set))
195 return -EFAULT;
196 old_fs = get_fs();
197 set_fs(KERNEL_DS);
198 ret = sys_sigprocmask(how,
199 set ? (old_sigset_t __user *) &s : NULL,
200 oset ? (old_sigset_t __user *) &s : NULL);
201 set_fs(old_fs);
202 if (ret == 0)
203 if (oset)
204 ret = put_user(s, oset);
205 return ret;
206}
207
208asmlinkage long compat_sys_setrlimit(unsigned int resource,
209 struct compat_rlimit __user *rlim)
210{
211 struct rlimit r;
212 int ret;
213 mm_segment_t old_fs = get_fs ();
214
215 if (resource >= RLIM_NLIMITS)
216 return -EINVAL;
217
218 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
219 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
220 __get_user(r.rlim_max, &rlim->rlim_max))
221 return -EFAULT;
222
223 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
224 r.rlim_cur = RLIM_INFINITY;
225 if (r.rlim_max == COMPAT_RLIM_INFINITY)
226 r.rlim_max = RLIM_INFINITY;
227 set_fs(KERNEL_DS);
228 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
229 set_fs(old_fs);
230 return ret;
231}
232
233#ifdef COMPAT_RLIM_OLD_INFINITY
234
235asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
236 struct compat_rlimit __user *rlim)
237{
238 struct rlimit r;
239 int ret;
240 mm_segment_t old_fs = get_fs();
241
242 set_fs(KERNEL_DS);
243 ret = sys_old_getrlimit(resource, &r);
244 set_fs(old_fs);
245
246 if (!ret) {
247 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
248 r.rlim_cur = COMPAT_RLIM_INFINITY;
249 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
250 r.rlim_max = COMPAT_RLIM_INFINITY;
251
252 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
253 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
254 __put_user(r.rlim_max, &rlim->rlim_max))
255 return -EFAULT;
256 }
257 return ret;
258}
259
260#endif
261
262asmlinkage long compat_sys_getrlimit (unsigned int resource,
263 struct compat_rlimit __user *rlim)
264{
265 struct rlimit r;
266 int ret;
267 mm_segment_t old_fs = get_fs();
268
269 set_fs(KERNEL_DS);
270 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
271 set_fs(old_fs);
272 if (!ret) {
273 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
274 r.rlim_cur = COMPAT_RLIM_INFINITY;
275 if (r.rlim_max > COMPAT_RLIM_INFINITY)
276 r.rlim_max = COMPAT_RLIM_INFINITY;
277
278 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
279 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
280 __put_user(r.rlim_max, &rlim->rlim_max))
281 return -EFAULT;
282 }
283 return ret;
284}
285
286int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
287{
288 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
289 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
290 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
291 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
292 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
293 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
294 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
295 __put_user(r->ru_idrss, &ru->ru_idrss) ||
296 __put_user(r->ru_isrss, &ru->ru_isrss) ||
297 __put_user(r->ru_minflt, &ru->ru_minflt) ||
298 __put_user(r->ru_majflt, &ru->ru_majflt) ||
299 __put_user(r->ru_nswap, &ru->ru_nswap) ||
300 __put_user(r->ru_inblock, &ru->ru_inblock) ||
301 __put_user(r->ru_oublock, &ru->ru_oublock) ||
302 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
303 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
304 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
305 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
306 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
307 return -EFAULT;
308 return 0;
309}
310
311asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
312{
313 struct rusage r;
314 int ret;
315 mm_segment_t old_fs = get_fs();
316
317 set_fs(KERNEL_DS);
318 ret = sys_getrusage(who, (struct rusage __user *) &r);
319 set_fs(old_fs);
320
321 if (ret)
322 return ret;
323
324 if (put_compat_rusage(&r, ru))
325 return -EFAULT;
326
327 return 0;
328}
329
330asmlinkage long
331compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
332 struct compat_rusage __user *ru)
333{
334 if (!ru) {
335 return sys_wait4(pid, stat_addr, options, NULL);
336 } else {
337 struct rusage r;
338 int ret;
339 unsigned int status;
340 mm_segment_t old_fs = get_fs();
341
342 set_fs (KERNEL_DS);
343 ret = sys_wait4(pid,
344 (stat_addr ?
345 (unsigned int __user *) &status : NULL),
346 options, (struct rusage __user *) &r);
347 set_fs (old_fs);
348
349 if (ret > 0) {
350 if (put_compat_rusage(&r, ru))
351 return -EFAULT;
352 if (stat_addr && put_user(status, stat_addr))
353 return -EFAULT;
354 }
355 return ret;
356 }
357}
358
359asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
360 struct compat_siginfo __user *uinfo, int options,
361 struct compat_rusage __user *uru)
362{
363 siginfo_t info;
364 struct rusage ru;
365 long ret;
366 mm_segment_t old_fs = get_fs();
367
368 memset(&info, 0, sizeof(info));
369
370 set_fs(KERNEL_DS);
371 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
372 uru ? (struct rusage __user *)&ru : NULL);
373 set_fs(old_fs);
374
375 if ((ret < 0) || (info.si_signo == 0))
376 return ret;
377
378 if (uru) {
379 ret = put_compat_rusage(&ru, uru);
380 if (ret)
381 return ret;
382 }
383
384 BUG_ON(info.si_code & __SI_MASK);
385 info.si_code |= __SI_CHLD;
386 return copy_siginfo_to_user32(uinfo, &info);
387}
388
389static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
390 unsigned len, cpumask_t *new_mask)
391{
392 unsigned long *k;
393
394 if (len < sizeof(cpumask_t))
395 memset(new_mask, 0, sizeof(cpumask_t));
396 else if (len > sizeof(cpumask_t))
397 len = sizeof(cpumask_t);
398
399 k = cpus_addr(*new_mask);
400 return compat_get_bitmap(k, user_mask_ptr, len * 8);
401}
402
403asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
404 unsigned int len,
405 compat_ulong_t __user *user_mask_ptr)
406{
407 cpumask_t new_mask;
408 int retval;
409
410 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
411 if (retval)
412 return retval;
413
414 return sched_setaffinity(pid, new_mask);
415}
416
417asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
418 compat_ulong_t __user *user_mask_ptr)
419{
420 int ret;
421 cpumask_t mask;
422 unsigned long *k;
423 unsigned int min_length = sizeof(cpumask_t);
424
425 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
426 min_length = sizeof(compat_ulong_t);
427
428 if (len < min_length)
429 return -EINVAL;
430
431 ret = sched_getaffinity(pid, &mask);
432 if (ret < 0)
433 return ret;
434
435 k = cpus_addr(mask);
436 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
437 if (ret)
438 return ret;
439
440 return min_length;
441}
442
443int get_compat_itimerspec(struct itimerspec *dst,
444 const struct compat_itimerspec __user *src)
445{
446 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
447 get_compat_timespec(&dst->it_value, &src->it_value))
448 return -EFAULT;
449 return 0;
450}
451
452int put_compat_itimerspec(struct compat_itimerspec __user *dst,
453 const struct itimerspec *src)
454{
455 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
456 put_compat_timespec(&src->it_value, &dst->it_value))
457 return -EFAULT;
458 return 0;
459}
460
461long compat_sys_timer_create(clockid_t which_clock,
462 struct compat_sigevent __user *timer_event_spec,
463 timer_t __user *created_timer_id)
464{
465 struct sigevent __user *event = NULL;
466
467 if (timer_event_spec) {
468 struct sigevent kevent;
469
470 event = compat_alloc_user_space(sizeof(*event));
471 if (get_compat_sigevent(&kevent, timer_event_spec) ||
472 copy_to_user(event, &kevent, sizeof(*event)))
473 return -EFAULT;
474 }
475
476 return sys_timer_create(which_clock, event, created_timer_id);
477}
478
479long compat_sys_timer_settime(timer_t timer_id, int flags,
480 struct compat_itimerspec __user *new,
481 struct compat_itimerspec __user *old)
482{
483 long err;
484 mm_segment_t oldfs;
485 struct itimerspec newts, oldts;
486
487 if (!new)
488 return -EINVAL;
489 if (get_compat_itimerspec(&newts, new))
490 return -EFAULT;
491 oldfs = get_fs();
492 set_fs(KERNEL_DS);
493 err = sys_timer_settime(timer_id, flags,
494 (struct itimerspec __user *) &newts,
495 (struct itimerspec __user *) &oldts);
496 set_fs(oldfs);
497 if (!err && old && put_compat_itimerspec(old, &oldts))
498 return -EFAULT;
499 return err;
500}
501
502long compat_sys_timer_gettime(timer_t timer_id,
503 struct compat_itimerspec __user *setting)
504{
505 long err;
506 mm_segment_t oldfs;
507 struct itimerspec ts;
508
509 oldfs = get_fs();
510 set_fs(KERNEL_DS);
511 err = sys_timer_gettime(timer_id,
512 (struct itimerspec __user *) &ts);
513 set_fs(oldfs);
514 if (!err && put_compat_itimerspec(setting, &ts))
515 return -EFAULT;
516 return err;
517}
518
519long compat_sys_clock_settime(clockid_t which_clock,
520 struct compat_timespec __user *tp)
521{
522 long err;
523 mm_segment_t oldfs;
524 struct timespec ts;
525
526 if (get_compat_timespec(&ts, tp))
527 return -EFAULT;
528 oldfs = get_fs();
529 set_fs(KERNEL_DS);
530 err = sys_clock_settime(which_clock,
531 (struct timespec __user *) &ts);
532 set_fs(oldfs);
533 return err;
534}
535
536long compat_sys_clock_gettime(clockid_t which_clock,
537 struct compat_timespec __user *tp)
538{
539 long err;
540 mm_segment_t oldfs;
541 struct timespec ts;
542
543 oldfs = get_fs();
544 set_fs(KERNEL_DS);
545 err = sys_clock_gettime(which_clock,
546 (struct timespec __user *) &ts);
547 set_fs(oldfs);
548 if (!err && put_compat_timespec(&ts, tp))
549 return -EFAULT;
550 return err;
551}
552
553long compat_sys_clock_getres(clockid_t which_clock,
554 struct compat_timespec __user *tp)
555{
556 long err;
557 mm_segment_t oldfs;
558 struct timespec ts;
559
560 oldfs = get_fs();
561 set_fs(KERNEL_DS);
562 err = sys_clock_getres(which_clock,
563 (struct timespec __user *) &ts);
564 set_fs(oldfs);
565 if (!err && tp && put_compat_timespec(&ts, tp))
566 return -EFAULT;
567 return err;
568}
569
570static long compat_clock_nanosleep_restart(struct restart_block *restart)
571{
572 long err;
573 mm_segment_t oldfs;
574 struct timespec tu;
575 struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
576
577 restart->arg1 = (unsigned long) &tu;
578 oldfs = get_fs();
579 set_fs(KERNEL_DS);
580 err = clock_nanosleep_restart(restart);
581 set_fs(oldfs);
582
583 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
584 put_compat_timespec(&tu, rmtp))
585 return -EFAULT;
586
587 if (err == -ERESTART_RESTARTBLOCK) {
588 restart->fn = compat_clock_nanosleep_restart;
589 restart->arg1 = (unsigned long) rmtp;
590 }
591 return err;
592}
593
594long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
595 struct compat_timespec __user *rqtp,
596 struct compat_timespec __user *rmtp)
597{
598 long err;
599 mm_segment_t oldfs;
600 struct timespec in, out;
601 struct restart_block *restart;
602
603 if (get_compat_timespec(&in, rqtp))
604 return -EFAULT;
605
606 oldfs = get_fs();
607 set_fs(KERNEL_DS);
608 err = sys_clock_nanosleep(which_clock, flags,
609 (struct timespec __user *) &in,
610 (struct timespec __user *) &out);
611 set_fs(oldfs);
612
613 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
614 put_compat_timespec(&out, rmtp))
615 return -EFAULT;
616
617 if (err == -ERESTART_RESTARTBLOCK) {
618 restart = &current_thread_info()->restart_block;
619 restart->fn = compat_clock_nanosleep_restart;
620 restart->arg1 = (unsigned long) rmtp;
621 }
622 return err;
623}
624
625/*
626 * We currently only need the following fields from the sigevent
627 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
628 * sigev_notify_thread_id). The others are handled in user mode.
629 * We also assume that copying sigev_value.sival_int is sufficient
630 * to keep all the bits of sigev_value.sival_ptr intact.
631 */
632int get_compat_sigevent(struct sigevent *event,
633 const struct compat_sigevent __user *u_event)
634{
635 memset(event, 0, sizeof(*event));
636 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
637 __get_user(event->sigev_value.sival_int,
638 &u_event->sigev_value.sival_int) ||
639 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
640 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
641 __get_user(event->sigev_notify_thread_id,
642 &u_event->sigev_notify_thread_id))
643 ? -EFAULT : 0;
644}
645
646long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
647 unsigned long bitmap_size)
648{
649 int i, j;
650 unsigned long m;
651 compat_ulong_t um;
652 unsigned long nr_compat_longs;
653
654 /* align bitmap up to nearest compat_long_t boundary */
655 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
656
657 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
658 return -EFAULT;
659
660 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
661
662 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
663 m = 0;
664
665 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
666 /*
667 * We dont want to read past the end of the userspace
668 * bitmap. We must however ensure the end of the
669 * kernel bitmap is zeroed.
670 */
671 if (nr_compat_longs-- > 0) {
672 if (__get_user(um, umask))
673 return -EFAULT;
674 } else {
675 um = 0;
676 }
677
678 umask++;
679 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
680 }
681 *mask++ = m;
682 }
683
684 return 0;
685}
686
687long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
688 unsigned long bitmap_size)
689{
690 int i, j;
691 unsigned long m;
692 compat_ulong_t um;
693 unsigned long nr_compat_longs;
694
695 /* align bitmap up to nearest compat_long_t boundary */
696 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
697
698 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
699 return -EFAULT;
700
701 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
702
703 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
704 m = *mask++;
705
706 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
707 um = m;
708
709 /*
710 * We dont want to write past the end of the userspace
711 * bitmap.
712 */
713 if (nr_compat_longs-- > 0) {
714 if (__put_user(um, umask))
715 return -EFAULT;
716 }
717
718 umask++;
719 m >>= 4*sizeof(um);
720 m >>= 4*sizeof(um);
721 }
722 }
723
724 return 0;
725}
726
727void
728sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
729{
730 switch (_NSIG_WORDS) {
731 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
732 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
733 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
734 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
735 }
736}
737
738asmlinkage long
739compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
740 struct compat_siginfo __user *uinfo,
741 struct compat_timespec __user *uts, compat_size_t sigsetsize)
742{
743 compat_sigset_t s32;
744 sigset_t s;
745 int sig;
746 struct timespec t;
747 siginfo_t info;
748 long ret, timeout = 0;
749
750 if (sigsetsize != sizeof(sigset_t))
751 return -EINVAL;
752
753 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
754 return -EFAULT;
755 sigset_from_compat(&s, &s32);
756 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
757 signotset(&s);
758
759 if (uts) {
760 if (get_compat_timespec (&t, uts))
761 return -EFAULT;
762 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
763 || t.tv_sec < 0)
764 return -EINVAL;
765 }
766
767 spin_lock_irq(&current->sighand->siglock);
768 sig = dequeue_signal(current, &s, &info);
769 if (!sig) {
770 timeout = MAX_SCHEDULE_TIMEOUT;
771 if (uts)
772 timeout = timespec_to_jiffies(&t)
773 +(t.tv_sec || t.tv_nsec);
774 if (timeout) {
775 current->real_blocked = current->blocked;
776 sigandsets(&current->blocked, &current->blocked, &s);
777
778 recalc_sigpending();
779 spin_unlock_irq(&current->sighand->siglock);
780
781 timeout = schedule_timeout_interruptible(timeout);
782
783 spin_lock_irq(&current->sighand->siglock);
784 sig = dequeue_signal(current, &s, &info);
785 current->blocked = current->real_blocked;
786 siginitset(&current->real_blocked, 0);
787 recalc_sigpending();
788 }
789 }
790 spin_unlock_irq(&current->sighand->siglock);
791
792 if (sig) {
793 ret = sig;
794 if (uinfo) {
795 if (copy_siginfo_to_user32(uinfo, &info))
796 ret = -EFAULT;
797 }
798 }else {
799 ret = timeout?-EINTR:-EAGAIN;
800 }
801 return ret;
802
803}
804
805#ifdef __ARCH_WANT_COMPAT_SYS_TIME
806
807/* compat_time_t is a 32 bit "long" and needs to get converted. */
808
809asmlinkage long compat_sys_time(compat_time_t __user * tloc)
810{
811 compat_time_t i;
812 struct timeval tv;
813
814 do_gettimeofday(&tv);
815 i = tv.tv_sec;
816
817 if (tloc) {
818 if (put_user(i,tloc))
819 i = -EFAULT;
820 }
821 return i;
822}
823
824asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
825{
826 struct timespec tv;
827 int err;
828
829 if (get_user(tv.tv_sec, tptr))
830 return -EFAULT;
831
832 tv.tv_nsec = 0;
833
834 err = security_settime(&tv, NULL);
835 if (err)
836 return err;
837
838 do_settimeofday(&tv);
839 return 0;
840}
841
842#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
843
844#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
845asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
846{
847 sigset_t newset;
848 compat_sigset_t newset32;
849
850 /* XXX: Don't preclude handling different sized sigset_t's. */
851 if (sigsetsize != sizeof(sigset_t))
852 return -EINVAL;
853
854 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
855 return -EFAULT;
856 sigset_from_compat(&newset, &newset32);
857 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
858
859 spin_lock_irq(&current->sighand->siglock);
860 current->saved_sigmask = current->blocked;
861 current->blocked = newset;
862 recalc_sigpending();
863 spin_unlock_irq(&current->sighand->siglock);
864
865 current->state = TASK_INTERRUPTIBLE;
866 schedule();
867 set_thread_flag(TIF_RESTORE_SIGMASK);
868 return -ERESTARTNOHAND;
869}
870#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
871
872asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
873{
874 struct timex txc;
875 int ret;
876
877 memset(&txc, 0, sizeof(struct timex));
878
879 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
880 __get_user(txc.modes, &utp->modes) ||
881 __get_user(txc.offset, &utp->offset) ||
882 __get_user(txc.freq, &utp->freq) ||
883 __get_user(txc.maxerror, &utp->maxerror) ||
884 __get_user(txc.esterror, &utp->esterror) ||
885 __get_user(txc.status, &utp->status) ||
886 __get_user(txc.constant, &utp->constant) ||
887 __get_user(txc.precision, &utp->precision) ||
888 __get_user(txc.tolerance, &utp->tolerance) ||
889 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
890 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
891 __get_user(txc.tick, &utp->tick) ||
892 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
893 __get_user(txc.jitter, &utp->jitter) ||
894 __get_user(txc.shift, &utp->shift) ||
895 __get_user(txc.stabil, &utp->stabil) ||
896 __get_user(txc.jitcnt, &utp->jitcnt) ||
897 __get_user(txc.calcnt, &utp->calcnt) ||
898 __get_user(txc.errcnt, &utp->errcnt) ||
899 __get_user(txc.stbcnt, &utp->stbcnt))
900 return -EFAULT;
901
902 ret = do_adjtimex(&txc);
903
904 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
905 __put_user(txc.modes, &utp->modes) ||
906 __put_user(txc.offset, &utp->offset) ||
907 __put_user(txc.freq, &utp->freq) ||
908 __put_user(txc.maxerror, &utp->maxerror) ||
909 __put_user(txc.esterror, &utp->esterror) ||
910 __put_user(txc.status, &utp->status) ||
911 __put_user(txc.constant, &utp->constant) ||
912 __put_user(txc.precision, &utp->precision) ||
913 __put_user(txc.tolerance, &utp->tolerance) ||
914 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
915 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
916 __put_user(txc.tick, &utp->tick) ||
917 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
918 __put_user(txc.jitter, &utp->jitter) ||
919 __put_user(txc.shift, &utp->shift) ||
920 __put_user(txc.stabil, &utp->stabil) ||
921 __put_user(txc.jitcnt, &utp->jitcnt) ||
922 __put_user(txc.calcnt, &utp->calcnt) ||
923 __put_user(txc.errcnt, &utp->errcnt) ||
924 __put_user(txc.stbcnt, &utp->stbcnt))
925 ret = -EFAULT;
926
927 return ret;
928}
929
930#ifdef CONFIG_NUMA
931asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
932 compat_uptr_t __user *pages32,
933 const int __user *nodes,
934 int __user *status,
935 int flags)
936{
937 const void __user * __user *pages;
938 int i;
939
940 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
941 for (i = 0; i < nr_pages; i++) {
942 compat_uptr_t p;
943
944 if (get_user(p, pages32 + i) ||
945 put_user(compat_ptr(p), pages + i))
946 return -EFAULT;
947 }
948 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
949}
950
951asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
952 compat_ulong_t maxnode,
953 const compat_ulong_t __user *old_nodes,
954 const compat_ulong_t __user *new_nodes)
955{
956 unsigned long __user *old = NULL;
957 unsigned long __user *new = NULL;
958 nodemask_t tmp_mask;
959 unsigned long nr_bits;
960 unsigned long size;
961
962 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
963 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
964 if (old_nodes) {
965 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
966 return -EFAULT;
967 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
968 if (new_nodes)
969 new = old + size / sizeof(unsigned long);
970 if (copy_to_user(old, nodes_addr(tmp_mask), size))
971 return -EFAULT;
972 }
973 if (new_nodes) {
974 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
975 return -EFAULT;
976 if (new == NULL)
977 new = compat_alloc_user_space(size);
978 if (copy_to_user(new, nodes_addr(tmp_mask), size))
979 return -EFAULT;
980 }
981 return sys_migrate_pages(pid, nr_bits + 1, old, new);
982}
983#endif
984
985struct compat_sysinfo {
986 s32 uptime;
987 u32 loads[3];
988 u32 totalram;
989 u32 freeram;
990 u32 sharedram;
991 u32 bufferram;
992 u32 totalswap;
993 u32 freeswap;
994 u16 procs;
995 u16 pad;
996 u32 totalhigh;
997 u32 freehigh;
998 u32 mem_unit;
999 char _f[20-2*sizeof(u32)-sizeof(int)];
1000};
1001
1002asmlinkage long
1003compat_sys_sysinfo(struct compat_sysinfo __user *info)
1004{
1005 struct sysinfo s;
1006
1007 do_sysinfo(&s);
1008
1009 /* Check to see if any memory value is too large for 32-bit and scale
1010 * down if needed
1011 */
1012 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1013 int bitcount = 0;
1014
1015 while (s.mem_unit < PAGE_SIZE) {
1016 s.mem_unit <<= 1;
1017 bitcount++;
1018 }
1019
1020 s.totalram >>= bitcount;
1021 s.freeram >>= bitcount;
1022 s.sharedram >>= bitcount;
1023 s.bufferram >>= bitcount;
1024 s.totalswap >>= bitcount;
1025 s.freeswap >>= bitcount;
1026 s.totalhigh >>= bitcount;
1027 s.freehigh >>= bitcount;
1028 }
1029
1030 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1031 __put_user (s.uptime, &info->uptime) ||
1032 __put_user (s.loads[0], &info->loads[0]) ||
1033 __put_user (s.loads[1], &info->loads[1]) ||
1034 __put_user (s.loads[2], &info->loads[2]) ||
1035 __put_user (s.totalram, &info->totalram) ||
1036 __put_user (s.freeram, &info->freeram) ||
1037 __put_user (s.sharedram, &info->sharedram) ||
1038 __put_user (s.bufferram, &info->bufferram) ||
1039 __put_user (s.totalswap, &info->totalswap) ||
1040 __put_user (s.freeswap, &info->freeswap) ||
1041 __put_user (s.procs, &info->procs) ||
1042 __put_user (s.totalhigh, &info->totalhigh) ||
1043 __put_user (s.freehigh, &info->freehigh) ||
1044 __put_user (s.mem_unit, &info->mem_unit))
1045 return -EFAULT;
1046
1047 return 0;
1048}
1049