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[mirror_ubuntu-zesty-kernel.git] / kernel / compat.c
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1da177e4
LT		 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 */
1da177e4
LT		 20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
3158e941 23#include <linux/timex.h>
1da177e4
LT		 24
25#include <asm/uaccess.h>
1da177e4
LT		 26
27int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
28{
29 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
30 __get_user(ts->tv_sec, &cts->tv_sec) ||
31 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
32}
33
34int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
35{
36 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
37 __put_user(ts->tv_sec, &cts->tv_sec) ||
38 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
39}
40
41static long compat_nanosleep_restart(struct restart_block *restart)
42{
43 unsigned long expire = restart->arg0, now = jiffies;
44 struct compat_timespec __user *rmtp;
45
46 /* Did it expire while we handled signals? */
47 if (!time_after(expire, now))
48 return 0;
49
75bcc8c5 50 expire = schedule_timeout_interruptible(expire - now);
1da177e4
LT		 51 if (expire == 0)
52 return 0;
53
54 rmtp = (struct compat_timespec __user *)restart->arg1;
55 if (rmtp) {
56 struct compat_timespec ct;
57 struct timespec t;
58
59 jiffies_to_timespec(expire, &t);
60 ct.tv_sec = t.tv_sec;
61 ct.tv_nsec = t.tv_nsec;
62 if (copy_to_user(rmtp, &ct, sizeof(ct)))
63 return -EFAULT;
64 }
65 /* The 'restart' block is already filled in */
66 return -ERESTART_RESTARTBLOCK;
67}
68
69asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
70 struct compat_timespec __user *rmtp)
71{
72 struct timespec t;
73 struct restart_block *restart;
74 unsigned long expire;
75
76 if (get_compat_timespec(&t, rqtp))
77 return -EFAULT;
78
79 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
80 return -EINVAL;
81
82 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
75bcc8c5 83 expire = schedule_timeout_interruptible(expire);
1da177e4
LT		 84 if (expire == 0)
85 return 0;
86
87 if (rmtp) {
88 jiffies_to_timespec(expire, &t);
89 if (put_compat_timespec(&t, rmtp))
90 return -EFAULT;
91 }
92 restart = &current_thread_info()->restart_block;
93 restart->fn = compat_nanosleep_restart;
94 restart->arg0 = jiffies + expire;
95 restart->arg1 = (unsigned long) rmtp;
96 return -ERESTART_RESTARTBLOCK;
97}
98
99static inline long get_compat_itimerval(struct itimerval *o,
100 struct compat_itimerval __user *i)
101{
102 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
103 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
104 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
105 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
106 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
107}
108
109static inline long put_compat_itimerval(struct compat_itimerval __user *o,
110 struct itimerval *i)
111{
112 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
113 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
114 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
115 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
116 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
117}
118
119asmlinkage long compat_sys_getitimer(int which,
120 struct compat_itimerval __user *it)
121{
122 struct itimerval kit;
123 int error;
124
125 error = do_getitimer(which, &kit);
126 if (!error && put_compat_itimerval(it, &kit))
127 error = -EFAULT;
128 return error;
129}
130
131asmlinkage long compat_sys_setitimer(int which,
132 struct compat_itimerval __user *in,
133 struct compat_itimerval __user *out)
134{
135 struct itimerval kin, kout;
136 int error;
137
138 if (in) {
139 if (get_compat_itimerval(&kin, in))
140 return -EFAULT;
141 } else
142 memset(&kin, 0, sizeof(kin));
143
144 error = do_setitimer(which, &kin, out ? &kout : NULL);
145 if (error || !out)
146 return error;
147 if (put_compat_itimerval(out, &kout))
148 return -EFAULT;
149 return 0;
150}
151
152asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
153{
154 /*
155 * In the SMP world we might just be unlucky and have one of
156 * the times increment as we use it. Since the value is an
157 * atomically safe type this is just fine. Conceptually its
158 * as if the syscall took an instant longer to occur.
159 */
160 if (tbuf) {
161 struct compat_tms tmp;
162 struct task_struct *tsk = current;
163 struct task_struct *t;
164 cputime_t utime, stime, cutime, cstime;
165
166 read_lock(&tasklist_lock);
167 utime = tsk->signal->utime;
168 stime = tsk->signal->stime;
169 t = tsk;
170 do {
171 utime = cputime_add(utime, t->utime);
172 stime = cputime_add(stime, t->stime);
173 t = next_thread(t);
174 } while (t != tsk);
175
176 /*
177 * While we have tasklist_lock read-locked, no dying thread
178 * can be updating current->signal->[us]time. Instead,
179 * we got their counts included in the live thread loop.
180 * However, another thread can come in right now and
181 * do a wait call that updates current->signal->c[us]time.
182 * To make sure we always see that pair updated atomically,
183 * we take the siglock around fetching them.
184 */
185 spin_lock_irq(&tsk->sighand->siglock);
186 cutime = tsk->signal->cutime;
187 cstime = tsk->signal->cstime;
188 spin_unlock_irq(&tsk->sighand->siglock);
189 read_unlock(&tasklist_lock);
190
191 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
192 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
193 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
194 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
195 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
196 return -EFAULT;
197 }
198 return compat_jiffies_to_clock_t(jiffies);
199}
200
201/*
202 * Assumption: old_sigset_t and compat_old_sigset_t are both
203 * types that can be passed to put_user()/get_user().
204 */
205
206asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
207{
208 old_sigset_t s;
209 long ret;
210 mm_segment_t old_fs = get_fs();
211
212 set_fs(KERNEL_DS);
213 ret = sys_sigpending((old_sigset_t __user *) &s);
214 set_fs(old_fs);
215 if (ret == 0)
216 ret = put_user(s, set);
217 return ret;
218}
219
220asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
221 compat_old_sigset_t __user *oset)
222{
223 old_sigset_t s;
224 long ret;
225 mm_segment_t old_fs;
226
227 if (set && get_user(s, set))
228 return -EFAULT;
229 old_fs = get_fs();
230 set_fs(KERNEL_DS);
231 ret = sys_sigprocmask(how,
232 set ? (old_sigset_t __user *) &s : NULL,
233 oset ? (old_sigset_t __user *) &s : NULL);
234 set_fs(old_fs);
235 if (ret == 0)
236 if (oset)
237 ret = put_user(s, oset);
238 return ret;
239}
240
1da177e4
LT		 241asmlinkage long compat_sys_setrlimit(unsigned int resource,
242 struct compat_rlimit __user *rlim)
243{
244 struct rlimit r;
245 int ret;
246 mm_segment_t old_fs = get_fs ();
247
248 if (resource >= RLIM_NLIMITS)
249 return -EINVAL;
250
251 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
252 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
253 __get_user(r.rlim_max, &rlim->rlim_max))
254 return -EFAULT;
255
256 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
257 r.rlim_cur = RLIM_INFINITY;
258 if (r.rlim_max == COMPAT_RLIM_INFINITY)
259 r.rlim_max = RLIM_INFINITY;
260 set_fs(KERNEL_DS);
261 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
262 set_fs(old_fs);
263 return ret;
264}
265
266#ifdef COMPAT_RLIM_OLD_INFINITY
267
268asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
269 struct compat_rlimit __user *rlim)
270{
271 struct rlimit r;
272 int ret;
273 mm_segment_t old_fs = get_fs();
274
275 set_fs(KERNEL_DS);
276 ret = sys_old_getrlimit(resource, &r);
277 set_fs(old_fs);
278
279 if (!ret) {
280 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
281 r.rlim_cur = COMPAT_RLIM_INFINITY;
282 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
283 r.rlim_max = COMPAT_RLIM_INFINITY;
284
285 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
286 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
287 __put_user(r.rlim_max, &rlim->rlim_max))
288 return -EFAULT;
289 }
290 return ret;
291}
292
293#endif
294
295asmlinkage long compat_sys_getrlimit (unsigned int resource,
296 struct compat_rlimit __user *rlim)
297{
298 struct rlimit r;
299 int ret;
300 mm_segment_t old_fs = get_fs();
301
302 set_fs(KERNEL_DS);
303 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
304 set_fs(old_fs);
305 if (!ret) {
306 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
307 r.rlim_cur = COMPAT_RLIM_INFINITY;
308 if (r.rlim_max > COMPAT_RLIM_INFINITY)
309 r.rlim_max = COMPAT_RLIM_INFINITY;
310
311 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
312 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
313 __put_user(r.rlim_max, &rlim->rlim_max))
314 return -EFAULT;
315 }
316 return ret;
317}
318
319int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
320{
321 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
322 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
323 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
324 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
325 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
326 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
327 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
328 __put_user(r->ru_idrss, &ru->ru_idrss) ||
329 __put_user(r->ru_isrss, &ru->ru_isrss) ||
330 __put_user(r->ru_minflt, &ru->ru_minflt) ||
331 __put_user(r->ru_majflt, &ru->ru_majflt) ||
332 __put_user(r->ru_nswap, &ru->ru_nswap) ||
333 __put_user(r->ru_inblock, &ru->ru_inblock) ||
334 __put_user(r->ru_oublock, &ru->ru_oublock) ||
335 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
336 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
337 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
338 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
339 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
340 return -EFAULT;
341 return 0;
342}
343
344asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
345{
346 struct rusage r;
347 int ret;
348 mm_segment_t old_fs = get_fs();
349
350 set_fs(KERNEL_DS);
351 ret = sys_getrusage(who, (struct rusage __user *) &r);
352 set_fs(old_fs);
353
354 if (ret)
355 return ret;
356
357 if (put_compat_rusage(&r, ru))
358 return -EFAULT;
359
360 return 0;
361}
362
363asmlinkage long
364compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
365 struct compat_rusage __user *ru)
366{
367 if (!ru) {
368 return sys_wait4(pid, stat_addr, options, NULL);
369 } else {
370 struct rusage r;
371 int ret;
372 unsigned int status;
373 mm_segment_t old_fs = get_fs();
374
375 set_fs (KERNEL_DS);
376 ret = sys_wait4(pid,
377 (stat_addr ?
378 (unsigned int __user *) &status : NULL),
379 options, (struct rusage __user *) &r);
380 set_fs (old_fs);
381
382 if (ret > 0) {
383 if (put_compat_rusage(&r, ru))
384 return -EFAULT;
385 if (stat_addr && put_user(status, stat_addr))
386 return -EFAULT;
387 }
388 return ret;
389 }
390}
391
392asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
393 struct compat_siginfo __user *uinfo, int options,
394 struct compat_rusage __user *uru)
395{
396 siginfo_t info;
397 struct rusage ru;
398 long ret;
399 mm_segment_t old_fs = get_fs();
400
401 memset(&info, 0, sizeof(info));
402
403 set_fs(KERNEL_DS);
404 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
405 uru ? (struct rusage __user *)&ru : NULL);
406 set_fs(old_fs);
407
408 if ((ret < 0) || (info.si_signo == 0))
409 return ret;
410
411 if (uru) {
412 ret = put_compat_rusage(&ru, uru);
413 if (ret)
414 return ret;
415 }
416
417 BUG_ON(info.si_code & __SI_MASK);
418 info.si_code |= __SI_CHLD;
419 return copy_siginfo_to_user32(uinfo, &info);
420}
421
422static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
423 unsigned len, cpumask_t *new_mask)
424{
425 unsigned long *k;
426
427 if (len < sizeof(cpumask_t))
428 memset(new_mask, 0, sizeof(cpumask_t));
429 else if (len > sizeof(cpumask_t))
430 len = sizeof(cpumask_t);
431
432 k = cpus_addr(*new_mask);
433 return compat_get_bitmap(k, user_mask_ptr, len * 8);
434}
435
436asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
437 unsigned int len,
438 compat_ulong_t __user *user_mask_ptr)
439{
440 cpumask_t new_mask;
441 int retval;
442
443 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
444 if (retval)
445 return retval;
446
447 return sched_setaffinity(pid, new_mask);
448}
449
450asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
451 compat_ulong_t __user *user_mask_ptr)
452{
453 int ret;
454 cpumask_t mask;
455 unsigned long *k;
456 unsigned int min_length = sizeof(cpumask_t);
457
458 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
459 min_length = sizeof(compat_ulong_t);
460
461 if (len < min_length)
462 return -EINVAL;
463
464 ret = sched_getaffinity(pid, &mask);
465 if (ret < 0)
466 return ret;
467
468 k = cpus_addr(mask);
469 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
470 if (ret)
471 return ret;
472
473 return min_length;
474}
475
476static int get_compat_itimerspec(struct itimerspec *dst,
477 struct compat_itimerspec __user *src)
478{
479 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
480 get_compat_timespec(&dst->it_value, &src->it_value))
481 return -EFAULT;
482 return 0;
483}
484
485static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
486 struct itimerspec *src)
487{
488 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
489 put_compat_timespec(&src->it_value, &dst->it_value))
490 return -EFAULT;
491 return 0;
492}
493
3a0f69d5
CH		 494long compat_sys_timer_create(clockid_t which_clock,
495 struct compat_sigevent __user *timer_event_spec,
496 timer_t __user *created_timer_id)
497{
498 struct sigevent __user *event = NULL;
499
500 if (timer_event_spec) {
501 struct sigevent kevent;
502
503 event = compat_alloc_user_space(sizeof(*event));
504 if (get_compat_sigevent(&kevent, timer_event_spec) ||
505 copy_to_user(event, &kevent, sizeof(*event)))
506 return -EFAULT;
507 }
508
509 return sys_timer_create(which_clock, event, created_timer_id);
510}
511
1da177e4
LT		 512long compat_sys_timer_settime(timer_t timer_id, int flags,
513 struct compat_itimerspec __user *new,
514 struct compat_itimerspec __user *old)
515{
516 long err;
517 mm_segment_t oldfs;
518 struct itimerspec newts, oldts;
519
520 if (!new)
521 return -EINVAL;
522 if (get_compat_itimerspec(&newts, new))
523 return -EFAULT;
524 oldfs = get_fs();
525 set_fs(KERNEL_DS);
526 err = sys_timer_settime(timer_id, flags,
527 (struct itimerspec __user *) &newts,
528 (struct itimerspec __user *) &oldts);
529 set_fs(oldfs);
530 if (!err && old && put_compat_itimerspec(old, &oldts))
531 return -EFAULT;
532 return err;
533}
534
535long compat_sys_timer_gettime(timer_t timer_id,
536 struct compat_itimerspec __user *setting)
537{
538 long err;
539 mm_segment_t oldfs;
540 struct itimerspec ts;
541
542 oldfs = get_fs();
543 set_fs(KERNEL_DS);
544 err = sys_timer_gettime(timer_id,
545 (struct itimerspec __user *) &ts);
546 set_fs(oldfs);
547 if (!err && put_compat_itimerspec(setting, &ts))
548 return -EFAULT;
549 return err;
550}
551
552long compat_sys_clock_settime(clockid_t which_clock,
553 struct compat_timespec __user *tp)
554{
555 long err;
556 mm_segment_t oldfs;
557 struct timespec ts;
558
559 if (get_compat_timespec(&ts, tp))
560 return -EFAULT;
561 oldfs = get_fs();
562 set_fs(KERNEL_DS);
563 err = sys_clock_settime(which_clock,
564 (struct timespec __user *) &ts);
565 set_fs(oldfs);
566 return err;
567}
568
569long compat_sys_clock_gettime(clockid_t which_clock,
570 struct compat_timespec __user *tp)
571{
572 long err;
573 mm_segment_t oldfs;
574 struct timespec ts;
575
576 oldfs = get_fs();
577 set_fs(KERNEL_DS);
578 err = sys_clock_gettime(which_clock,
579 (struct timespec __user *) &ts);
580 set_fs(oldfs);
581 if (!err && put_compat_timespec(&ts, tp))
582 return -EFAULT;
583 return err;
584}
585
586long compat_sys_clock_getres(clockid_t which_clock,
587 struct compat_timespec __user *tp)
588{
589 long err;
590 mm_segment_t oldfs;
591 struct timespec ts;
592
593 oldfs = get_fs();
594 set_fs(KERNEL_DS);
595 err = sys_clock_getres(which_clock,
596 (struct timespec __user *) &ts);
597 set_fs(oldfs);
598 if (!err && tp && put_compat_timespec(&ts, tp))
599 return -EFAULT;
600 return err;
601}
602
603long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
604 struct compat_timespec __user *rqtp,
605 struct compat_timespec __user *rmtp)
606{
607 long err;
608 mm_segment_t oldfs;
609 struct timespec in, out;
610
611 if (get_compat_timespec(&in, rqtp))
612 return -EFAULT;
613
614 oldfs = get_fs();
615 set_fs(KERNEL_DS);
616 err = sys_clock_nanosleep(which_clock, flags,
617 (struct timespec __user *) &in,
618 (struct timespec __user *) &out);
619 set_fs(oldfs);
620 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
621 put_compat_timespec(&out, rmtp))
622 return -EFAULT;
623 return err;
624}
625
626/*
627 * We currently only need the following fields from the sigevent
628 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
629 * sigev_notify_thread_id). The others are handled in user mode.
630 * We also assume that copying sigev_value.sival_int is sufficient
631 * to keep all the bits of sigev_value.sival_ptr intact.
632 */
633int get_compat_sigevent(struct sigevent *event,
634 const struct compat_sigevent __user *u_event)
635{
51410d3c 636 memset(event, 0, sizeof(*event));
1da177e4
LT		 637 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
638 __get_user(event->sigev_value.sival_int,
639 &u_event->sigev_value.sival_int) ||
640 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
641 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
642 __get_user(event->sigev_notify_thread_id,
643 &u_event->sigev_notify_thread_id))
644 ? -EFAULT : 0;
645}
646
1da177e4
LT		 647long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
648 unsigned long bitmap_size)
649{
650 int i, j;
651 unsigned long m;
652 compat_ulong_t um;
653 unsigned long nr_compat_longs;
654
655 /* align bitmap up to nearest compat_long_t boundary */
656 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
657
658 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
659 return -EFAULT;
660
661 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
662
663 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
664 m = 0;
665
666 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
667 /*
668 * We dont want to read past the end of the userspace
669 * bitmap. We must however ensure the end of the
670 * kernel bitmap is zeroed.
671 */
672 if (nr_compat_longs-- > 0) {
673 if (__get_user(um, umask))
674 return -EFAULT;
675 } else {
676 um = 0;
677 }
678
679 umask++;
680 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
681 }
682 *mask++ = m;
683 }
684
685 return 0;
686}
687
688long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
689 unsigned long bitmap_size)
690{
691 int i, j;
692 unsigned long m;
693 compat_ulong_t um;
694 unsigned long nr_compat_longs;
695
696 /* align bitmap up to nearest compat_long_t boundary */
697 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
698
699 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
700 return -EFAULT;
701
702 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
703
704 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
705 m = *mask++;
706
707 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
708 um = m;
709
710 /*
711 * We dont want to write past the end of the userspace
712 * bitmap.
713 */
714 if (nr_compat_longs-- > 0) {
715 if (__put_user(um, umask))
716 return -EFAULT;
717 }
718
719 umask++;
720 m >>= 4*sizeof(um);
721 m >>= 4*sizeof(um);
722 }
723 }
724
725 return 0;
726}
727
728void
729sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
730{
731 switch (_NSIG_WORDS) {
732#if defined (__COMPAT_ENDIAN_SWAP__)
733 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
734 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
735 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
736 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
737#else
738 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
739 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
740 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
741 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
742#endif
743 }
744}
745
746asmlinkage long
747compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
748 struct compat_siginfo __user *uinfo,
749 struct compat_timespec __user *uts, compat_size_t sigsetsize)
750{
751 compat_sigset_t s32;
752 sigset_t s;
753 int sig;
754 struct timespec t;
755 siginfo_t info;
756 long ret, timeout = 0;
757
758 if (sigsetsize != sizeof(sigset_t))
759 return -EINVAL;
760
761 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
762 return -EFAULT;
763 sigset_from_compat(&s, &s32);
764 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
765 signotset(&s);
766
767 if (uts) {
768 if (get_compat_timespec (&t, uts))
769 return -EFAULT;
770 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
771 || t.tv_sec < 0)
772 return -EINVAL;
773 }
774
775 spin_lock_irq(&current->sighand->siglock);
776 sig = dequeue_signal(current, &s, &info);
777 if (!sig) {
778 timeout = MAX_SCHEDULE_TIMEOUT;
779 if (uts)
780 timeout = timespec_to_jiffies(&t)
781 +(t.tv_sec || t.tv_nsec);
782 if (timeout) {
783 current->real_blocked = current->blocked;
784 sigandsets(&current->blocked, &current->blocked, &s);
785
786 recalc_sigpending();
787 spin_unlock_irq(&current->sighand->siglock);
788
75bcc8c5 789 timeout = schedule_timeout_interruptible(timeout);
1da177e4
LT		 790
791 spin_lock_irq(&current->sighand->siglock);
792 sig = dequeue_signal(current, &s, &info);
793 current->blocked = current->real_blocked;
794 siginitset(&current->real_blocked, 0);
795 recalc_sigpending();
796 }
797 }
798 spin_unlock_irq(&current->sighand->siglock);
799
800 if (sig) {
801 ret = sig;
802 if (uinfo) {
803 if (copy_siginfo_to_user32(uinfo, &info))
804 ret = -EFAULT;
805 }
806 }else {
807 ret = timeout?-EINTR:-EAGAIN;
808 }
809 return ret;
810
811}
812
813#ifdef __ARCH_WANT_COMPAT_SYS_TIME
814
815/* compat_time_t is a 32 bit "long" and needs to get converted. */
816
817asmlinkage long compat_sys_time(compat_time_t __user * tloc)
818{
819 compat_time_t i;
820 struct timeval tv;
821
822 do_gettimeofday(&tv);
823 i = tv.tv_sec;
824
825 if (tloc) {
826 if (put_user(i,tloc))
827 i = -EFAULT;
828 }
829 return i;
830}
831
832asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
833{
834 struct timespec tv;
835 int err;
836
837 if (get_user(tv.tv_sec, tptr))
838 return -EFAULT;
839
840 tv.tv_nsec = 0;
841
842 err = security_settime(&tv, NULL);
843 if (err)
844 return err;
845
846 do_settimeofday(&tv);
847 return 0;
848}
849
850#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 851
852#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
853asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
854{
855 sigset_t newset;
856 compat_sigset_t newset32;
857
858 /* XXX: Don't preclude handling different sized sigset_t's. */
859 if (sigsetsize != sizeof(sigset_t))
860 return -EINVAL;
861
862 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
863 return -EFAULT;
864 sigset_from_compat(&newset, &newset32);
865 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
866
867 spin_lock_irq(&current->sighand->siglock);
868 current->saved_sigmask = current->blocked;
869 current->blocked = newset;
870 recalc_sigpending();
871 spin_unlock_irq(&current->sighand->siglock);
872
873 current->state = TASK_INTERRUPTIBLE;
874 schedule();
875 set_thread_flag(TIF_RESTORE_SIGMASK);
876 return -ERESTARTNOHAND;
877}
878#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 879
880asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
881{
882 struct timex txc;
883 int ret;
884
885 memset(&txc, 0, sizeof(struct timex));
886
887 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
888 __get_user(txc.modes, &utp->modes) ||
889 __get_user(txc.offset, &utp->offset) ||
890 __get_user(txc.freq, &utp->freq) ||
891 __get_user(txc.maxerror, &utp->maxerror) ||
892 __get_user(txc.esterror, &utp->esterror) ||
893 __get_user(txc.status, &utp->status) ||
894 __get_user(txc.constant, &utp->constant) ||
895 __get_user(txc.precision, &utp->precision) ||
896 __get_user(txc.tolerance, &utp->tolerance) ||
897 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
898 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
899 __get_user(txc.tick, &utp->tick) ||
900 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
901 __get_user(txc.jitter, &utp->jitter) ||
902 __get_user(txc.shift, &utp->shift) ||
903 __get_user(txc.stabil, &utp->stabil) ||
904 __get_user(txc.jitcnt, &utp->jitcnt) ||
905 __get_user(txc.calcnt, &utp->calcnt) ||
906 __get_user(txc.errcnt, &utp->errcnt) ||
907 __get_user(txc.stbcnt, &utp->stbcnt))
908 return -EFAULT;
909
910 ret = do_adjtimex(&txc);
911
912 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
913 __put_user(txc.modes, &utp->modes) ||
914 __put_user(txc.offset, &utp->offset) ||
915 __put_user(txc.freq, &utp->freq) ||
916 __put_user(txc.maxerror, &utp->maxerror) ||
917 __put_user(txc.esterror, &utp->esterror) ||
918 __put_user(txc.status, &utp->status) ||
919 __put_user(txc.constant, &utp->constant) ||
920 __put_user(txc.precision, &utp->precision) ||
921 __put_user(txc.tolerance, &utp->tolerance) ||
922 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
923 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
924 __put_user(txc.tick, &utp->tick) ||
925 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
926 __put_user(txc.jitter, &utp->jitter) ||
927 __put_user(txc.shift, &utp->shift) ||
928 __put_user(txc.stabil, &utp->stabil) ||
929 __put_user(txc.jitcnt, &utp->jitcnt) ||
930 __put_user(txc.calcnt, &utp->calcnt) ||
931 __put_user(txc.errcnt, &utp->errcnt) ||
932 __put_user(txc.stbcnt, &utp->stbcnt))
933 ret = -EFAULT;
934
935 return ret;
936}
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