projects/linux·blob v2.6.13 · refs

860 lines · 21.4 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/futex.h> /* for FUTEX_WAIT */
21#include <linux/syscalls.h>
22#include <linux/unistd.h>
23#include <linux/security.h>
24
25#include <asm/uaccess.h>
26#include <asm/bug.h>
27
28int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
29{
30 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
31 __get_user(ts->tv_sec, &cts->tv_sec) ||
32 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
33}
34
35int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
36{
37 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
38 __put_user(ts->tv_sec, &cts->tv_sec) ||
39 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
40}
41
42static long compat_nanosleep_restart(struct restart_block *restart)
43{
44 unsigned long expire = restart->arg0, now = jiffies;
45 struct compat_timespec __user *rmtp;
46
47 /* Did it expire while we handled signals? */
48 if (!time_after(expire, now))
49 return 0;
50
51 current->state = TASK_INTERRUPTIBLE;
52 expire = schedule_timeout(expire - now);
53 if (expire == 0)
54 return 0;
55
56 rmtp = (struct compat_timespec __user *)restart->arg1;
57 if (rmtp) {
58 struct compat_timespec ct;
59 struct timespec t;
60
61 jiffies_to_timespec(expire, &t);
62 ct.tv_sec = t.tv_sec;
63 ct.tv_nsec = t.tv_nsec;
64 if (copy_to_user(rmtp, &ct, sizeof(ct)))
65 return -EFAULT;
66 }
67 /* The 'restart' block is already filled in */
68 return -ERESTART_RESTARTBLOCK;
69}
70
71asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
72 struct compat_timespec __user *rmtp)
73{
74 struct timespec t;
75 struct restart_block *restart;
76 unsigned long expire;
77
78 if (get_compat_timespec(&t, rqtp))
79 return -EFAULT;
80
81 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
82 return -EINVAL;
83
84 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
85 current->state = TASK_INTERRUPTIBLE;
86 expire = schedule_timeout(expire);
87 if (expire == 0)
88 return 0;
89
90 if (rmtp) {
91 jiffies_to_timespec(expire, &t);
92 if (put_compat_timespec(&t, rmtp))
93 return -EFAULT;
94 }
95 restart = &current_thread_info()->restart_block;
96 restart->fn = compat_nanosleep_restart;
97 restart->arg0 = jiffies + expire;
98 restart->arg1 = (unsigned long) rmtp;
99 return -ERESTART_RESTARTBLOCK;
100}
101
102static inline long get_compat_itimerval(struct itimerval *o,
103 struct compat_itimerval __user *i)
104{
105 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
106 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
107 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
108 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
109 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
110}
111
112static inline long put_compat_itimerval(struct compat_itimerval __user *o,
113 struct itimerval *i)
114{
115 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
116 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
117 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
118 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
119 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
120}
121
122asmlinkage long compat_sys_getitimer(int which,
123 struct compat_itimerval __user *it)
124{
125 struct itimerval kit;
126 int error;
127
128 error = do_getitimer(which, &kit);
129 if (!error && put_compat_itimerval(it, &kit))
130 error = -EFAULT;
131 return error;
132}
133
134asmlinkage long compat_sys_setitimer(int which,
135 struct compat_itimerval __user *in,
136 struct compat_itimerval __user *out)
137{
138 struct itimerval kin, kout;
139 int error;
140
141 if (in) {
142 if (get_compat_itimerval(&kin, in))
143 return -EFAULT;
144 } else
145 memset(&kin, 0, sizeof(kin));
146
147 error = do_setitimer(which, &kin, out ? &kout : NULL);
148 if (error || !out)
149 return error;
150 if (put_compat_itimerval(out, &kout))
151 return -EFAULT;
152 return 0;
153}
154
155asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
156{
157 /*
158 * In the SMP world we might just be unlucky and have one of
159 * the times increment as we use it. Since the value is an
160 * atomically safe type this is just fine. Conceptually its
161 * as if the syscall took an instant longer to occur.
162 */
163 if (tbuf) {
164 struct compat_tms tmp;
165 struct task_struct *tsk = current;
166 struct task_struct *t;
167 cputime_t utime, stime, cutime, cstime;
168
169 read_lock(&tasklist_lock);
170 utime = tsk->signal->utime;
171 stime = tsk->signal->stime;
172 t = tsk;
173 do {
174 utime = cputime_add(utime, t->utime);
175 stime = cputime_add(stime, t->stime);
176 t = next_thread(t);
177 } while (t != tsk);
178
179 /*
180 * While we have tasklist_lock read-locked, no dying thread
181 * can be updating current->signal->[us]time. Instead,
182 * we got their counts included in the live thread loop.
183 * However, another thread can come in right now and
184 * do a wait call that updates current->signal->c[us]time.
185 * To make sure we always see that pair updated atomically,
186 * we take the siglock around fetching them.
187 */
188 spin_lock_irq(&tsk->sighand->siglock);
189 cutime = tsk->signal->cutime;
190 cstime = tsk->signal->cstime;
191 spin_unlock_irq(&tsk->sighand->siglock);
192 read_unlock(&tasklist_lock);
193
194 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
195 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
196 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
197 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
198 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
199 return -EFAULT;
200 }
201 return compat_jiffies_to_clock_t(jiffies);
202}
203
204/*
205 * Assumption: old_sigset_t and compat_old_sigset_t are both
206 * types that can be passed to put_user()/get_user().
207 */
208
209asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
210{
211 old_sigset_t s;
212 long ret;
213 mm_segment_t old_fs = get_fs();
214
215 set_fs(KERNEL_DS);
216 ret = sys_sigpending((old_sigset_t __user *) &s);
217 set_fs(old_fs);
218 if (ret == 0)
219 ret = put_user(s, set);
220 return ret;
221}
222
223asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
224 compat_old_sigset_t __user *oset)
225{
226 old_sigset_t s;
227 long ret;
228 mm_segment_t old_fs;
229
230 if (set && get_user(s, set))
231 return -EFAULT;
232 old_fs = get_fs();
233 set_fs(KERNEL_DS);
234 ret = sys_sigprocmask(how,
235 set ? (old_sigset_t __user *) &s : NULL,
236 oset ? (old_sigset_t __user *) &s : NULL);
237 set_fs(old_fs);
238 if (ret == 0)
239 if (oset)
240 ret = put_user(s, oset);
241 return ret;
242}
243
244#ifdef CONFIG_FUTEX
245asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
246 struct compat_timespec __user *utime, u32 __user *uaddr2,
247 int val3)
248{
249 struct timespec t;
250 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
251 int val2 = 0;
252
253 if ((op == FUTEX_WAIT) && utime) {
254 if (get_compat_timespec(&t, utime))
255 return -EFAULT;
256 timeout = timespec_to_jiffies(&t) + 1;
257 }
258 if (op >= FUTEX_REQUEUE)
259 val2 = (int) (unsigned long) utime;
260
261 return do_futex((unsigned long)uaddr, op, val, timeout,
262 (unsigned long)uaddr2, val2, val3);
263}
264#endif
265
266asmlinkage long compat_sys_setrlimit(unsigned int resource,
267 struct compat_rlimit __user *rlim)
268{
269 struct rlimit r;
270 int ret;
271 mm_segment_t old_fs = get_fs ();
272
273 if (resource >= RLIM_NLIMITS)
274 return -EINVAL;
275
276 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
277 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
278 __get_user(r.rlim_max, &rlim->rlim_max))
279 return -EFAULT;
280
281 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
282 r.rlim_cur = RLIM_INFINITY;
283 if (r.rlim_max == COMPAT_RLIM_INFINITY)
284 r.rlim_max = RLIM_INFINITY;
285 set_fs(KERNEL_DS);
286 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
287 set_fs(old_fs);
288 return ret;
289}
290
291#ifdef COMPAT_RLIM_OLD_INFINITY
292
293asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
294 struct compat_rlimit __user *rlim)
295{
296 struct rlimit r;
297 int ret;
298 mm_segment_t old_fs = get_fs();
299
300 set_fs(KERNEL_DS);
301 ret = sys_old_getrlimit(resource, &r);
302 set_fs(old_fs);
303
304 if (!ret) {
305 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
306 r.rlim_cur = COMPAT_RLIM_INFINITY;
307 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
308 r.rlim_max = COMPAT_RLIM_INFINITY;
309
310 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
311 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
312 __put_user(r.rlim_max, &rlim->rlim_max))
313 return -EFAULT;
314 }
315 return ret;
316}
317
318#endif
319
320asmlinkage long compat_sys_getrlimit (unsigned int resource,
321 struct compat_rlimit __user *rlim)
322{
323 struct rlimit r;
324 int ret;
325 mm_segment_t old_fs = get_fs();
326
327 set_fs(KERNEL_DS);
328 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
329 set_fs(old_fs);
330 if (!ret) {
331 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
332 r.rlim_cur = COMPAT_RLIM_INFINITY;
333 if (r.rlim_max > COMPAT_RLIM_INFINITY)
334 r.rlim_max = COMPAT_RLIM_INFINITY;
335
336 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
337 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
338 __put_user(r.rlim_max, &rlim->rlim_max))
339 return -EFAULT;
340 }
341 return ret;
342}
343
344int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
345{
346 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
347 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
348 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
349 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
350 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
351 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
352 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
353 __put_user(r->ru_idrss, &ru->ru_idrss) ||
354 __put_user(r->ru_isrss, &ru->ru_isrss) ||
355 __put_user(r->ru_minflt, &ru->ru_minflt) ||
356 __put_user(r->ru_majflt, &ru->ru_majflt) ||
357 __put_user(r->ru_nswap, &ru->ru_nswap) ||
358 __put_user(r->ru_inblock, &ru->ru_inblock) ||
359 __put_user(r->ru_oublock, &ru->ru_oublock) ||
360 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
361 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
362 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
363 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
364 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
365 return -EFAULT;
366 return 0;
367}
368
369asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
370{
371 struct rusage r;
372 int ret;
373 mm_segment_t old_fs = get_fs();
374
375 set_fs(KERNEL_DS);
376 ret = sys_getrusage(who, (struct rusage __user *) &r);
377 set_fs(old_fs);
378
379 if (ret)
380 return ret;
381
382 if (put_compat_rusage(&r, ru))
383 return -EFAULT;
384
385 return 0;
386}
387
388asmlinkage long
389compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
390 struct compat_rusage __user *ru)
391{
392 if (!ru) {
393 return sys_wait4(pid, stat_addr, options, NULL);
394 } else {
395 struct rusage r;
396 int ret;
397 unsigned int status;
398 mm_segment_t old_fs = get_fs();
399
400 set_fs (KERNEL_DS);
401 ret = sys_wait4(pid,
402 (stat_addr ?
403 (unsigned int __user *) &status : NULL),
404 options, (struct rusage __user *) &r);
405 set_fs (old_fs);
406
407 if (ret > 0) {
408 if (put_compat_rusage(&r, ru))
409 return -EFAULT;
410 if (stat_addr && put_user(status, stat_addr))
411 return -EFAULT;
412 }
413 return ret;
414 }
415}
416
417asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
418 struct compat_siginfo __user *uinfo, int options,
419 struct compat_rusage __user *uru)
420{
421 siginfo_t info;
422 struct rusage ru;
423 long ret;
424 mm_segment_t old_fs = get_fs();
425
426 memset(&info, 0, sizeof(info));
427
428 set_fs(KERNEL_DS);
429 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
430 uru ? (struct rusage __user *)&ru : NULL);
431 set_fs(old_fs);
432
433 if ((ret < 0) || (info.si_signo == 0))
434 return ret;
435
436 if (uru) {
437 ret = put_compat_rusage(&ru, uru);
438 if (ret)
439 return ret;
440 }
441
442 BUG_ON(info.si_code & __SI_MASK);
443 info.si_code |= __SI_CHLD;
444 return copy_siginfo_to_user32(uinfo, &info);
445}
446
447static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
448 unsigned len, cpumask_t *new_mask)
449{
450 unsigned long *k;
451
452 if (len < sizeof(cpumask_t))
453 memset(new_mask, 0, sizeof(cpumask_t));
454 else if (len > sizeof(cpumask_t))
455 len = sizeof(cpumask_t);
456
457 k = cpus_addr(*new_mask);
458 return compat_get_bitmap(k, user_mask_ptr, len * 8);
459}
460
461asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
462 unsigned int len,
463 compat_ulong_t __user *user_mask_ptr)
464{
465 cpumask_t new_mask;
466 int retval;
467
468 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
469 if (retval)
470 return retval;
471
472 return sched_setaffinity(pid, new_mask);
473}
474
475asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
476 compat_ulong_t __user *user_mask_ptr)
477{
478 int ret;
479 cpumask_t mask;
480 unsigned long *k;
481 unsigned int min_length = sizeof(cpumask_t);
482
483 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
484 min_length = sizeof(compat_ulong_t);
485
486 if (len < min_length)
487 return -EINVAL;
488
489 ret = sched_getaffinity(pid, &mask);
490 if (ret < 0)
491 return ret;
492
493 k = cpus_addr(mask);
494 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
495 if (ret)
496 return ret;
497
498 return min_length;
499}
500
501static int get_compat_itimerspec(struct itimerspec *dst,
502 struct compat_itimerspec __user *src)
503{
504 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
505 get_compat_timespec(&dst->it_value, &src->it_value))
506 return -EFAULT;
507 return 0;
508}
509
510static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
511 struct itimerspec *src)
512{
513 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
514 put_compat_timespec(&src->it_value, &dst->it_value))
515 return -EFAULT;
516 return 0;
517}
518
519long compat_sys_timer_settime(timer_t timer_id, int flags,
520 struct compat_itimerspec __user *new,
521 struct compat_itimerspec __user *old)
522{
523 long err;
524 mm_segment_t oldfs;
525 struct itimerspec newts, oldts;
526
527 if (!new)
528 return -EINVAL;
529 if (get_compat_itimerspec(&newts, new))
530 return -EFAULT;
531 oldfs = get_fs();
532 set_fs(KERNEL_DS);
533 err = sys_timer_settime(timer_id, flags,
534 (struct itimerspec __user *) &newts,
535 (struct itimerspec __user *) &oldts);
536 set_fs(oldfs);
537 if (!err && old && put_compat_itimerspec(old, &oldts))
538 return -EFAULT;
539 return err;
540}
541
542long compat_sys_timer_gettime(timer_t timer_id,
543 struct compat_itimerspec __user *setting)
544{
545 long err;
546 mm_segment_t oldfs;
547 struct itimerspec ts;
548
549 oldfs = get_fs();
550 set_fs(KERNEL_DS);
551 err = sys_timer_gettime(timer_id,
552 (struct itimerspec __user *) &ts);
553 set_fs(oldfs);
554 if (!err && put_compat_itimerspec(setting, &ts))
555 return -EFAULT;
556 return err;
557}
558
559long compat_sys_clock_settime(clockid_t which_clock,
560 struct compat_timespec __user *tp)
561{
562 long err;
563 mm_segment_t oldfs;
564 struct timespec ts;
565
566 if (get_compat_timespec(&ts, tp))
567 return -EFAULT;
568 oldfs = get_fs();
569 set_fs(KERNEL_DS);
570 err = sys_clock_settime(which_clock,
571 (struct timespec __user *) &ts);
572 set_fs(oldfs);
573 return err;
574}
575
576long compat_sys_clock_gettime(clockid_t which_clock,
577 struct compat_timespec __user *tp)
578{
579 long err;
580 mm_segment_t oldfs;
581 struct timespec ts;
582
583 oldfs = get_fs();
584 set_fs(KERNEL_DS);
585 err = sys_clock_gettime(which_clock,
586 (struct timespec __user *) &ts);
587 set_fs(oldfs);
588 if (!err && put_compat_timespec(&ts, tp))
589 return -EFAULT;
590 return err;
591}
592
593long compat_sys_clock_getres(clockid_t which_clock,
594 struct compat_timespec __user *tp)
595{
596 long err;
597 mm_segment_t oldfs;
598 struct timespec ts;
599
600 oldfs = get_fs();
601 set_fs(KERNEL_DS);
602 err = sys_clock_getres(which_clock,
603 (struct timespec __user *) &ts);
604 set_fs(oldfs);
605 if (!err && tp && put_compat_timespec(&ts, tp))
606 return -EFAULT;
607 return err;
608}
609
610long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
611 struct compat_timespec __user *rqtp,
612 struct compat_timespec __user *rmtp)
613{
614 long err;
615 mm_segment_t oldfs;
616 struct timespec in, out;
617
618 if (get_compat_timespec(&in, rqtp))
619 return -EFAULT;
620
621 oldfs = get_fs();
622 set_fs(KERNEL_DS);
623 err = sys_clock_nanosleep(which_clock, flags,
624 (struct timespec __user *) &in,
625 (struct timespec __user *) &out);
626 set_fs(oldfs);
627 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
628 put_compat_timespec(&out, rmtp))
629 return -EFAULT;
630 return err;
631}
632
633/*
634 * We currently only need the following fields from the sigevent
635 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
636 * sigev_notify_thread_id). The others are handled in user mode.
637 * We also assume that copying sigev_value.sival_int is sufficient
638 * to keep all the bits of sigev_value.sival_ptr intact.
639 */
640int get_compat_sigevent(struct sigevent *event,
641 const struct compat_sigevent __user *u_event)
642{
643 memset(event, 0, sizeof(*event));
644 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
645 __get_user(event->sigev_value.sival_int,
646 &u_event->sigev_value.sival_int) ||
647 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
648 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
649 __get_user(event->sigev_notify_thread_id,
650 &u_event->sigev_notify_thread_id))
651 ? -EFAULT : 0;
652}
653
654/* timer_create is architecture specific because it needs sigevent conversion */
655
656long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
657 unsigned long bitmap_size)
658{
659 int i, j;
660 unsigned long m;
661 compat_ulong_t um;
662 unsigned long nr_compat_longs;
663
664 /* align bitmap up to nearest compat_long_t boundary */
665 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
666
667 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
668 return -EFAULT;
669
670 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
671
672 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
673 m = 0;
674
675 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
676 /*
677 * We dont want to read past the end of the userspace
678 * bitmap. We must however ensure the end of the
679 * kernel bitmap is zeroed.
680 */
681 if (nr_compat_longs-- > 0) {
682 if (__get_user(um, umask))
683 return -EFAULT;
684 } else {
685 um = 0;
686 }
687
688 umask++;
689 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
690 }
691 *mask++ = m;
692 }
693
694 return 0;
695}
696
697long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
698 unsigned long bitmap_size)
699{
700 int i, j;
701 unsigned long m;
702 compat_ulong_t um;
703 unsigned long nr_compat_longs;
704
705 /* align bitmap up to nearest compat_long_t boundary */
706 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
707
708 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
709 return -EFAULT;
710
711 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
712
713 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
714 m = *mask++;
715
716 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
717 um = m;
718
719 /*
720 * We dont want to write past the end of the userspace
721 * bitmap.
722 */
723 if (nr_compat_longs-- > 0) {
724 if (__put_user(um, umask))
725 return -EFAULT;
726 }
727
728 umask++;
729 m >>= 4*sizeof(um);
730 m >>= 4*sizeof(um);
731 }
732 }
733
734 return 0;
735}
736
737void
738sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
739{
740 switch (_NSIG_WORDS) {
741#if defined (__COMPAT_ENDIAN_SWAP__)
742 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
743 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
744 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
745 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
746#else
747 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
748 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
749 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
750 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
751#endif
752 }
753}
754
755asmlinkage long
756compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
757 struct compat_siginfo __user *uinfo,
758 struct compat_timespec __user *uts, compat_size_t sigsetsize)
759{
760 compat_sigset_t s32;
761 sigset_t s;
762 int sig;
763 struct timespec t;
764 siginfo_t info;
765 long ret, timeout = 0;
766
767 if (sigsetsize != sizeof(sigset_t))
768 return -EINVAL;
769
770 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
771 return -EFAULT;
772 sigset_from_compat(&s, &s32);
773 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
774 signotset(&s);
775
776 if (uts) {
777 if (get_compat_timespec (&t, uts))
778 return -EFAULT;
779 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
780 || t.tv_sec < 0)
781 return -EINVAL;
782 }
783
784 spin_lock_irq(&current->sighand->siglock);
785 sig = dequeue_signal(current, &s, &info);
786 if (!sig) {
787 timeout = MAX_SCHEDULE_TIMEOUT;
788 if (uts)
789 timeout = timespec_to_jiffies(&t)
790 +(t.tv_sec || t.tv_nsec);
791 if (timeout) {
792 current->real_blocked = current->blocked;
793 sigandsets(&current->blocked, &current->blocked, &s);
794
795 recalc_sigpending();
796 spin_unlock_irq(&current->sighand->siglock);
797
798 current->state = TASK_INTERRUPTIBLE;
799 timeout = schedule_timeout(timeout);
800
801 spin_lock_irq(&current->sighand->siglock);
802 sig = dequeue_signal(current, &s, &info);
803 current->blocked = current->real_blocked;
804 siginitset(&current->real_blocked, 0);
805 recalc_sigpending();
806 }
807 }
808 spin_unlock_irq(&current->sighand->siglock);
809
810 if (sig) {
811 ret = sig;
812 if (uinfo) {
813 if (copy_siginfo_to_user32(uinfo, &info))
814 ret = -EFAULT;
815 }
816 }else {
817 ret = timeout?-EINTR:-EAGAIN;
818 }
819 return ret;
820
821}
822
823#ifdef __ARCH_WANT_COMPAT_SYS_TIME
824
825/* compat_time_t is a 32 bit "long" and needs to get converted. */
826
827asmlinkage long compat_sys_time(compat_time_t __user * tloc)
828{
829 compat_time_t i;
830 struct timeval tv;
831
832 do_gettimeofday(&tv);
833 i = tv.tv_sec;
834
835 if (tloc) {
836 if (put_user(i,tloc))
837 i = -EFAULT;
838 }
839 return i;
840}
841
842asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
843{
844 struct timespec tv;
845 int err;
846
847 if (get_user(tv.tv_sec, tptr))
848 return -EFAULT;
849
850 tv.tv_nsec = 0;
851
852 err = security_settime(&tv, NULL);
853 if (err)
854 return err;
855
856 do_settimeofday(&tv);
857 return 0;
858}
859
860#endif /* __ARCH_WANT_COMPAT_SYS_TIME */