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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / kernel / compat.c
blob5f0e201bcfd3b883418b16f04c32da51cf2353be
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
29 int 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
36 int 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
43 static long compat_nanosleep_restart(struct restart_block *restart)
44 {
45 struct compat_timespec __user *rmtp;
46 struct timespec rmt;
47 mm_segment_t oldfs;
48 long ret;
49
50 rmtp = (struct compat_timespec __user *)(restart->arg1);
51 restart->arg1 = (unsigned long)&rmt;
52 oldfs = get_fs();
53 set_fs(KERNEL_DS);
54 ret = hrtimer_nanosleep_restart(restart);
55 set_fs(oldfs);
56
57 if (ret) {
58 restart->arg1 = (unsigned long)rmtp;
59
60 if (rmtp && put_compat_timespec(&rmt, rmtp))
61 return -EFAULT;
62 }
63
64 return ret;
65 }
66
67 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
68 struct compat_timespec __user *rmtp)
69 {
70 struct timespec tu, rmt;
71 mm_segment_t oldfs;
72 long ret;
73
74 if (get_compat_timespec(&tu, rqtp))
75 return -EFAULT;
76
77 if (!timespec_valid(&tu))
78 return -EINVAL;
79
80 oldfs = get_fs();
81 set_fs(KERNEL_DS);
82 ret = hrtimer_nanosleep(&tu,
83 rmtp ? (struct timespec __user *)&rmt : NULL,
84 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
85 set_fs(oldfs);
86
87 if (ret) {
88 struct restart_block *restart
89 = &current_thread_info()->restart_block;
90
91 restart->fn = compat_nanosleep_restart;
92 restart->arg1 = (unsigned long)rmtp;
93
94 if (rmtp && put_compat_timespec(&rmt, rmtp))
95 return -EFAULT;
96 }
97
98 return ret;
99 }
100
101 static inline long get_compat_itimerval(struct itimerval *o,
102 struct compat_itimerval __user *i)
103 {
104 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
105 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
106 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
107 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
108 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
109 }
110
111 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
112 struct itimerval *i)
113 {
114 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
115 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
116 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
117 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
118 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
119 }
120
121 asmlinkage long compat_sys_getitimer(int which,
122 struct compat_itimerval __user *it)
123 {
124 struct itimerval kit;
125 int error;
126
127 error = do_getitimer(which, &kit);
128 if (!error && put_compat_itimerval(it, &kit))
129 error = -EFAULT;
130 return error;
131 }
132
133 asmlinkage long compat_sys_setitimer(int which,
134 struct compat_itimerval __user *in,
135 struct compat_itimerval __user *out)
136 {
137 struct itimerval kin, kout;
138 int error;
139
140 if (in) {
141 if (get_compat_itimerval(&kin, in))
142 return -EFAULT;
143 } else
144 memset(&kin, 0, sizeof(kin));
145
146 error = do_setitimer(which, &kin, out ? &kout : NULL);
147 if (error || !out)
148 return error;
149 if (put_compat_itimerval(out, &kout))
150 return -EFAULT;
151 return 0;
152 }
153
154 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
155 {
156 /*
157 * In the SMP world we might just be unlucky and have one of
158 * the times increment as we use it. Since the value is an
159 * atomically safe type this is just fine. Conceptually its
160 * as if the syscall took an instant longer to occur.
161 */
162 if (tbuf) {
163 struct compat_tms tmp;
164 struct task_struct *tsk = current;
165 struct task_struct *t;
166 cputime_t utime, stime, cutime, cstime;
167
168 read_lock(&tasklist_lock);
169 utime = tsk->signal->utime;
170 stime = tsk->signal->stime;
171 t = tsk;
172 do {
173 utime = cputime_add(utime, t->utime);
174 stime = cputime_add(stime, t->stime);
175 t = next_thread(t);
176 } while (t != tsk);
177
178 /*
179 * While we have tasklist_lock read-locked, no dying thread
180 * can be updating current->signal->[us]time. Instead,
181 * we got their counts included in the live thread loop.
182 * However, another thread can come in right now and
183 * do a wait call that updates current->signal->c[us]time.
184 * To make sure we always see that pair updated atomically,
185 * we take the siglock around fetching them.
186 */
187 spin_lock_irq(&tsk->sighand->siglock);
188 cutime = tsk->signal->cutime;
189 cstime = tsk->signal->cstime;
190 spin_unlock_irq(&tsk->sighand->siglock);
191 read_unlock(&tasklist_lock);
192
193 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
194 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
195 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
196 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
197 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
198 return -EFAULT;
199 }
200 return compat_jiffies_to_clock_t(jiffies);
201 }
202
203 /*
204 * Assumption: old_sigset_t and compat_old_sigset_t are both
205 * types that can be passed to put_user()/get_user().
206 */
207
208 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
209 {
210 old_sigset_t s;
211 long ret;
212 mm_segment_t old_fs = get_fs();
213
214 set_fs(KERNEL_DS);
215 ret = sys_sigpending((old_sigset_t __user *) &s);
216 set_fs(old_fs);
217 if (ret == 0)
218 ret = put_user(s, set);
219 return ret;
220 }
221
222 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
223 compat_old_sigset_t __user *oset)
224 {
225 old_sigset_t s;
226 long ret;
227 mm_segment_t old_fs;
228
229 if (set && get_user(s, set))
230 return -EFAULT;
231 old_fs = get_fs();
232 set_fs(KERNEL_DS);
233 ret = sys_sigprocmask(how,
234 set ? (old_sigset_t __user *) &s : NULL,
235 oset ? (old_sigset_t __user *) &s : NULL);
236 set_fs(old_fs);
237 if (ret == 0)
238 if (oset)
239 ret = put_user(s, oset);
240 return ret;
241 }
242
243 asmlinkage long compat_sys_setrlimit(unsigned int resource,
244 struct compat_rlimit __user *rlim)
245 {
246 struct rlimit r;
247 int ret;
248 mm_segment_t old_fs = get_fs ();
249
250 if (resource >= RLIM_NLIMITS)
251 return -EINVAL;
252
253 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
254 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
255 __get_user(r.rlim_max, &rlim->rlim_max))
256 return -EFAULT;
257
258 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
259 r.rlim_cur = RLIM_INFINITY;
260 if (r.rlim_max == COMPAT_RLIM_INFINITY)
261 r.rlim_max = RLIM_INFINITY;
262 set_fs(KERNEL_DS);
263 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
264 set_fs(old_fs);
265 return ret;
266 }
267
268 #ifdef COMPAT_RLIM_OLD_INFINITY
269
270 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
271 struct compat_rlimit __user *rlim)
272 {
273 struct rlimit r;
274 int ret;
275 mm_segment_t old_fs = get_fs();
276
277 set_fs(KERNEL_DS);
278 ret = sys_old_getrlimit(resource, &r);
279 set_fs(old_fs);
280
281 if (!ret) {
282 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
283 r.rlim_cur = COMPAT_RLIM_INFINITY;
284 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
285 r.rlim_max = COMPAT_RLIM_INFINITY;
286
287 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
288 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
289 __put_user(r.rlim_max, &rlim->rlim_max))
290 return -EFAULT;
291 }
292 return ret;
293 }
294
295 #endif
296
297 asmlinkage long compat_sys_getrlimit (unsigned int resource,
298 struct compat_rlimit __user *rlim)
299 {
300 struct rlimit r;
301 int ret;
302 mm_segment_t old_fs = get_fs();
303
304 set_fs(KERNEL_DS);
305 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
306 set_fs(old_fs);
307 if (!ret) {
308 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
309 r.rlim_cur = COMPAT_RLIM_INFINITY;
310 if (r.rlim_max > COMPAT_RLIM_INFINITY)
311 r.rlim_max = COMPAT_RLIM_INFINITY;
312
313 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
314 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
315 __put_user(r.rlim_max, &rlim->rlim_max))
316 return -EFAULT;
317 }
318 return ret;
319 }
320
321 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
322 {
323 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
324 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
325 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
326 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
327 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
328 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
329 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
330 __put_user(r->ru_idrss, &ru->ru_idrss) ||
331 __put_user(r->ru_isrss, &ru->ru_isrss) ||
332 __put_user(r->ru_minflt, &ru->ru_minflt) ||
333 __put_user(r->ru_majflt, &ru->ru_majflt) ||
334 __put_user(r->ru_nswap, &ru->ru_nswap) ||
335 __put_user(r->ru_inblock, &ru->ru_inblock) ||
336 __put_user(r->ru_oublock, &ru->ru_oublock) ||
337 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
338 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
339 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
340 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
341 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
342 return -EFAULT;
343 return 0;
344 }
345
346 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
347 {
348 struct rusage r;
349 int ret;
350 mm_segment_t old_fs = get_fs();
351
352 set_fs(KERNEL_DS);
353 ret = sys_getrusage(who, (struct rusage __user *) &r);
354 set_fs(old_fs);
355
356 if (ret)
357 return ret;
358
359 if (put_compat_rusage(&r, ru))
360 return -EFAULT;
361
362 return 0;
363 }
364
365 asmlinkage long
366 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
367 struct compat_rusage __user *ru)
368 {
369 if (!ru) {
370 return sys_wait4(pid, stat_addr, options, NULL);
371 } else {
372 struct rusage r;
373 int ret;
374 unsigned int status;
375 mm_segment_t old_fs = get_fs();
376
377 set_fs (KERNEL_DS);
378 ret = sys_wait4(pid,
379 (stat_addr ?
380 (unsigned int __user *) &status : NULL),
381 options, (struct rusage __user *) &r);
382 set_fs (old_fs);
383
384 if (ret > 0) {
385 if (put_compat_rusage(&r, ru))
386 return -EFAULT;
387 if (stat_addr && put_user(status, stat_addr))
388 return -EFAULT;
389 }
390 return ret;
391 }
392 }
393
394 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
395 struct compat_siginfo __user *uinfo, int options,
396 struct compat_rusage __user *uru)
397 {
398 siginfo_t info;
399 struct rusage ru;
400 long ret;
401 mm_segment_t old_fs = get_fs();
402
403 memset(&info, 0, sizeof(info));
404
405 set_fs(KERNEL_DS);
406 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
407 uru ? (struct rusage __user *)&ru : NULL);
408 set_fs(old_fs);
409
410 if ((ret < 0) || (info.si_signo == 0))
411 return ret;
412
413 if (uru) {
414 ret = put_compat_rusage(&ru, uru);
415 if (ret)
416 return ret;
417 }
418
419 BUG_ON(info.si_code & __SI_MASK);
420 info.si_code |= __SI_CHLD;
421 return copy_siginfo_to_user32(uinfo, &info);
422 }
423
424 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
425 unsigned len, cpumask_t *new_mask)
426 {
427 unsigned long *k;
428
429 if (len < sizeof(cpumask_t))
430 memset(new_mask, 0, sizeof(cpumask_t));
431 else if (len > sizeof(cpumask_t))
432 len = sizeof(cpumask_t);
433
434 k = cpus_addr(*new_mask);
435 return compat_get_bitmap(k, user_mask_ptr, len * 8);
436 }
437
438 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
439 unsigned int len,
440 compat_ulong_t __user *user_mask_ptr)
441 {
442 cpumask_t new_mask;
443 int retval;
444
445 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
446 if (retval)
447 return retval;
448
449 return sched_setaffinity(pid, new_mask);
450 }
451
452 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
453 compat_ulong_t __user *user_mask_ptr)
454 {
455 int ret;
456 cpumask_t mask;
457 unsigned long *k;
458 unsigned int min_length = sizeof(cpumask_t);
459
460 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
461 min_length = sizeof(compat_ulong_t);
462
463 if (len < min_length)
464 return -EINVAL;
465
466 ret = sched_getaffinity(pid, &mask);
467 if (ret < 0)
468 return ret;
469
470 k = cpus_addr(mask);
471 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
472 if (ret)
473 return ret;
474
475 return min_length;
476 }
477
478 int get_compat_itimerspec(struct itimerspec *dst,
479 const struct compat_itimerspec __user *src)
480 {
481 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
482 get_compat_timespec(&dst->it_value, &src->it_value))
483 return -EFAULT;
484 return 0;
485 }
486
487 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
488 const struct itimerspec *src)
489 {
490 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
491 put_compat_timespec(&src->it_value, &dst->it_value))
492 return -EFAULT;
493 return 0;
494 }
495
496 long compat_sys_timer_create(clockid_t which_clock,
497 struct compat_sigevent __user *timer_event_spec,
498 timer_t __user *created_timer_id)
499 {
500 struct sigevent __user *event = NULL;
501
502 if (timer_event_spec) {
503 struct sigevent kevent;
504
505 event = compat_alloc_user_space(sizeof(*event));
506 if (get_compat_sigevent(&kevent, timer_event_spec) ||
507 copy_to_user(event, &kevent, sizeof(*event)))
508 return -EFAULT;
509 }
510
511 return sys_timer_create(which_clock, event, created_timer_id);
512 }
513
514 long compat_sys_timer_settime(timer_t timer_id, int flags,
515 struct compat_itimerspec __user *new,
516 struct compat_itimerspec __user *old)
517 {
518 long err;
519 mm_segment_t oldfs;
520 struct itimerspec newts, oldts;
521
522 if (!new)
523 return -EINVAL;
524 if (get_compat_itimerspec(&newts, new))
525 return -EFAULT;
526 oldfs = get_fs();
527 set_fs(KERNEL_DS);
528 err = sys_timer_settime(timer_id, flags,
529 (struct itimerspec __user *) &newts,
530 (struct itimerspec __user *) &oldts);
531 set_fs(oldfs);
532 if (!err && old && put_compat_itimerspec(old, &oldts))
533 return -EFAULT;
534 return err;
535 }
536
537 long compat_sys_timer_gettime(timer_t timer_id,
538 struct compat_itimerspec __user *setting)
539 {
540 long err;
541 mm_segment_t oldfs;
542 struct itimerspec ts;
543
544 oldfs = get_fs();
545 set_fs(KERNEL_DS);
546 err = sys_timer_gettime(timer_id,
547 (struct itimerspec __user *) &ts);
548 set_fs(oldfs);
549 if (!err && put_compat_itimerspec(setting, &ts))
550 return -EFAULT;
551 return err;
552 }
553
554 long compat_sys_clock_settime(clockid_t which_clock,
555 struct compat_timespec __user *tp)
556 {
557 long err;
558 mm_segment_t oldfs;
559 struct timespec ts;
560
561 if (get_compat_timespec(&ts, tp))
562 return -EFAULT;
563 oldfs = get_fs();
564 set_fs(KERNEL_DS);
565 err = sys_clock_settime(which_clock,
566 (struct timespec __user *) &ts);
567 set_fs(oldfs);
568 return err;
569 }
570
571 long compat_sys_clock_gettime(clockid_t which_clock,
572 struct compat_timespec __user *tp)
573 {
574 long err;
575 mm_segment_t oldfs;
576 struct timespec ts;
577
578 oldfs = get_fs();
579 set_fs(KERNEL_DS);
580 err = sys_clock_gettime(which_clock,
581 (struct timespec __user *) &ts);
582 set_fs(oldfs);
583 if (!err && put_compat_timespec(&ts, tp))
584 return -EFAULT;
585 return err;
586 }
587
588 long compat_sys_clock_getres(clockid_t which_clock,
589 struct compat_timespec __user *tp)
590 {
591 long err;
592 mm_segment_t oldfs;
593 struct timespec ts;
594
595 oldfs = get_fs();
596 set_fs(KERNEL_DS);
597 err = sys_clock_getres(which_clock,
598 (struct timespec __user *) &ts);
599 set_fs(oldfs);
600 if (!err && tp && put_compat_timespec(&ts, tp))
601 return -EFAULT;
602 return err;
603 }
604
605 static long compat_clock_nanosleep_restart(struct restart_block *restart)
606 {
607 long err;
608 mm_segment_t oldfs;
609 struct timespec tu;
610 struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
611
612 restart->arg1 = (unsigned long) &tu;
613 oldfs = get_fs();
614 set_fs(KERNEL_DS);
615 err = clock_nanosleep_restart(restart);
616 set_fs(oldfs);
617
618 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
619 put_compat_timespec(&tu, rmtp))
620 return -EFAULT;
621
622 if (err == -ERESTART_RESTARTBLOCK) {
623 restart->fn = compat_clock_nanosleep_restart;
624 restart->arg1 = (unsigned long) rmtp;
625 }
626 return err;
627 }
628
629 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
630 struct compat_timespec __user *rqtp,
631 struct compat_timespec __user *rmtp)
632 {
633 long err;
634 mm_segment_t oldfs;
635 struct timespec in, out;
636 struct restart_block *restart;
637
638 if (get_compat_timespec(&in, rqtp))
639 return -EFAULT;
640
641 oldfs = get_fs();
642 set_fs(KERNEL_DS);
643 err = sys_clock_nanosleep(which_clock, flags,
644 (struct timespec __user *) &in,
645 (struct timespec __user *) &out);
646 set_fs(oldfs);
647
648 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
649 put_compat_timespec(&out, rmtp))
650 return -EFAULT;
651
652 if (err == -ERESTART_RESTARTBLOCK) {
653 restart = &current_thread_info()->restart_block;
654 restart->fn = compat_clock_nanosleep_restart;
655 restart->arg1 = (unsigned long) rmtp;
656 }
657 return err;
658 }
659
660 /*
661 * We currently only need the following fields from the sigevent
662 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
663 * sigev_notify_thread_id). The others are handled in user mode.
664 * We also assume that copying sigev_value.sival_int is sufficient
665 * to keep all the bits of sigev_value.sival_ptr intact.
666 */
667 int get_compat_sigevent(struct sigevent *event,
668 const struct compat_sigevent __user *u_event)
669 {
670 memset(event, 0, sizeof(*event));
671 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
672 __get_user(event->sigev_value.sival_int,
673 &u_event->sigev_value.sival_int) ||
674 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
675 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
676 __get_user(event->sigev_notify_thread_id,
677 &u_event->sigev_notify_thread_id))
678 ? -EFAULT : 0;
679 }
680
681 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
682 unsigned long bitmap_size)
683 {
684 int i, j;
685 unsigned long m;
686 compat_ulong_t um;
687 unsigned long nr_compat_longs;
688
689 /* align bitmap up to nearest compat_long_t boundary */
690 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
691
692 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
693 return -EFAULT;
694
695 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
696
697 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
698 m = 0;
699
700 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
701 /*
702 * We dont want to read past the end of the userspace
703 * bitmap. We must however ensure the end of the
704 * kernel bitmap is zeroed.
705 */
706 if (nr_compat_longs-- > 0) {
707 if (__get_user(um, umask))
708 return -EFAULT;
709 } else {
710 um = 0;
711 }
712
713 umask++;
714 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
715 }
716 *mask++ = m;
717 }
718
719 return 0;
720 }
721
722 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
723 unsigned long bitmap_size)
724 {
725 int i, j;
726 unsigned long m;
727 compat_ulong_t um;
728 unsigned long nr_compat_longs;
729
730 /* align bitmap up to nearest compat_long_t boundary */
731 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
732
733 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
734 return -EFAULT;
735
736 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
737
738 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
739 m = *mask++;
740
741 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
742 um = m;
743
744 /*
745 * We dont want to write past the end of the userspace
746 * bitmap.
747 */
748 if (nr_compat_longs-- > 0) {
749 if (__put_user(um, umask))
750 return -EFAULT;
751 }
752
753 umask++;
754 m >>= 4*sizeof(um);
755 m >>= 4*sizeof(um);
756 }
757 }
758
759 return 0;
760 }
761
762 void
763 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
764 {
765 switch (_NSIG_WORDS) {
766 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
767 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
768 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
769 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
770 }
771 }
772
773 asmlinkage long
774 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
775 struct compat_siginfo __user *uinfo,
776 struct compat_timespec __user *uts, compat_size_t sigsetsize)
777 {
778 compat_sigset_t s32;
779 sigset_t s;
780 int sig;
781 struct timespec t;
782 siginfo_t info;
783 long ret, timeout = 0;
784
785 if (sigsetsize != sizeof(sigset_t))
786 return -EINVAL;
787
788 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
789 return -EFAULT;
790 sigset_from_compat(&s, &s32);
791 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
792 signotset(&s);
793
794 if (uts) {
795 if (get_compat_timespec (&t, uts))
796 return -EFAULT;
797 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
798 || t.tv_sec < 0)
799 return -EINVAL;
800 }
801
802 spin_lock_irq(&current->sighand->siglock);
803 sig = dequeue_signal(current, &s, &info);
804 if (!sig) {
805 timeout = MAX_SCHEDULE_TIMEOUT;
806 if (uts)
807 timeout = timespec_to_jiffies(&t)
808 +(t.tv_sec || t.tv_nsec);
809 if (timeout) {
810 current->real_blocked = current->blocked;
811 sigandsets(&current->blocked, &current->blocked, &s);
812
813 recalc_sigpending();
814 spin_unlock_irq(&current->sighand->siglock);
815
816 timeout = schedule_timeout_interruptible(timeout);
817
818 spin_lock_irq(&current->sighand->siglock);
819 sig = dequeue_signal(current, &s, &info);
820 current->blocked = current->real_blocked;
821 siginitset(&current->real_blocked, 0);
822 recalc_sigpending();
823 }
824 }
825 spin_unlock_irq(&current->sighand->siglock);
826
827 if (sig) {
828 ret = sig;
829 if (uinfo) {
830 if (copy_siginfo_to_user32(uinfo, &info))
831 ret = -EFAULT;
832 }
833 }else {
834 ret = timeout?-EINTR:-EAGAIN;
835 }
836 return ret;
837
838 }
839
840 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
841
842 /* compat_time_t is a 32 bit "long" and needs to get converted. */
843
844 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
845 {
846 compat_time_t i;
847 struct timeval tv;
848
849 do_gettimeofday(&tv);
850 i = tv.tv_sec;
851
852 if (tloc) {
853 if (put_user(i,tloc))
854 i = -EFAULT;
855 }
856 return i;
857 }
858
859 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
860 {
861 struct timespec tv;
862 int err;
863
864 if (get_user(tv.tv_sec, tptr))
865 return -EFAULT;
866
867 tv.tv_nsec = 0;
868
869 err = security_settime(&tv, NULL);
870 if (err)
871 return err;
872
873 do_settimeofday(&tv);
874 return 0;
875 }
876
877 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
878
879 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
880 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
881 {
882 sigset_t newset;
883 compat_sigset_t newset32;
884
885 /* XXX: Don't preclude handling different sized sigset_t's. */
886 if (sigsetsize != sizeof(sigset_t))
887 return -EINVAL;
888
889 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
890 return -EFAULT;
891 sigset_from_compat(&newset, &newset32);
892 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
893
894 spin_lock_irq(&current->sighand->siglock);
895 current->saved_sigmask = current->blocked;
896 current->blocked = newset;
897 recalc_sigpending();
898 spin_unlock_irq(&current->sighand->siglock);
899
900 current->state = TASK_INTERRUPTIBLE;
901 schedule();
902 set_thread_flag(TIF_RESTORE_SIGMASK);
903 return -ERESTARTNOHAND;
904 }
905 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
906
907 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
908 {
909 struct timex txc;
910 int ret;
911
912 memset(&txc, 0, sizeof(struct timex));
913
914 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
915 __get_user(txc.modes, &utp->modes) ||
916 __get_user(txc.offset, &utp->offset) ||
917 __get_user(txc.freq, &utp->freq) ||
918 __get_user(txc.maxerror, &utp->maxerror) ||
919 __get_user(txc.esterror, &utp->esterror) ||
920 __get_user(txc.status, &utp->status) ||
921 __get_user(txc.constant, &utp->constant) ||
922 __get_user(txc.precision, &utp->precision) ||
923 __get_user(txc.tolerance, &utp->tolerance) ||
924 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
925 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
926 __get_user(txc.tick, &utp->tick) ||
927 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
928 __get_user(txc.jitter, &utp->jitter) ||
929 __get_user(txc.shift, &utp->shift) ||
930 __get_user(txc.stabil, &utp->stabil) ||
931 __get_user(txc.jitcnt, &utp->jitcnt) ||
932 __get_user(txc.calcnt, &utp->calcnt) ||
933 __get_user(txc.errcnt, &utp->errcnt) ||
934 __get_user(txc.stbcnt, &utp->stbcnt))
935 return -EFAULT;
936
937 ret = do_adjtimex(&txc);
938
939 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
940 __put_user(txc.modes, &utp->modes) ||
941 __put_user(txc.offset, &utp->offset) ||
942 __put_user(txc.freq, &utp->freq) ||
943 __put_user(txc.maxerror, &utp->maxerror) ||
944 __put_user(txc.esterror, &utp->esterror) ||
945 __put_user(txc.status, &utp->status) ||
946 __put_user(txc.constant, &utp->constant) ||
947 __put_user(txc.precision, &utp->precision) ||
948 __put_user(txc.tolerance, &utp->tolerance) ||
949 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
950 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
951 __put_user(txc.tick, &utp->tick) ||
952 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
953 __put_user(txc.jitter, &utp->jitter) ||
954 __put_user(txc.shift, &utp->shift) ||
955 __put_user(txc.stabil, &utp->stabil) ||
956 __put_user(txc.jitcnt, &utp->jitcnt) ||
957 __put_user(txc.calcnt, &utp->calcnt) ||
958 __put_user(txc.errcnt, &utp->errcnt) ||
959 __put_user(txc.stbcnt, &utp->stbcnt))
960 ret = -EFAULT;
961
962 return ret;
963 }
964
965 #ifdef CONFIG_NUMA
966 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
967 compat_uptr_t __user *pages32,
968 const int __user *nodes,
969 int __user *status,
970 int flags)
971 {
972 const void __user * __user *pages;
973 int i;
974
975 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
976 for (i = 0; i < nr_pages; i++) {
977 compat_uptr_t p;
978
979 if (get_user(p, pages32 + i) ||
980 put_user(compat_ptr(p), pages + i))
981 return -EFAULT;
982 }
983 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
984 }
985
986 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
987 compat_ulong_t maxnode,
988 const compat_ulong_t __user *old_nodes,
989 const compat_ulong_t __user *new_nodes)
990 {
991 unsigned long __user *old = NULL;
992 unsigned long __user *new = NULL;
993 nodemask_t tmp_mask;
994 unsigned long nr_bits;
995 unsigned long size;
996
997 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
998 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
999 if (old_nodes) {
1000 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1001 return -EFAULT;
1002 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1003 if (new_nodes)
1004 new = old + size / sizeof(unsigned long);
1005 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1006 return -EFAULT;
1007 }
1008 if (new_nodes) {
1009 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1010 return -EFAULT;
1011 if (new == NULL)
1012 new = compat_alloc_user_space(size);
1013 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1014 return -EFAULT;
1015 }
1016 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1017 }
1018 #endif
1019
1020 struct compat_sysinfo {
1021 s32 uptime;
1022 u32 loads[3];
1023 u32 totalram;
1024 u32 freeram;
1025 u32 sharedram;
1026 u32 bufferram;
1027 u32 totalswap;
1028 u32 freeswap;
1029 u16 procs;
1030 u16 pad;
1031 u32 totalhigh;
1032 u32 freehigh;
1033 u32 mem_unit;
1034 char _f[20-2*sizeof(u32)-sizeof(int)];
1035 };
1036
1037 asmlinkage long
1038 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1039 {
1040 struct sysinfo s;
1041
1042 do_sysinfo(&s);
1043
1044 /* Check to see if any memory value is too large for 32-bit and scale
1045 * down if needed
1046 */
1047 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1048 int bitcount = 0;
1049
1050 while (s.mem_unit < PAGE_SIZE) {
1051 s.mem_unit <<= 1;
1052 bitcount++;
1053 }
1054
1055 s.totalram >>= bitcount;
1056 s.freeram >>= bitcount;
1057 s.sharedram >>= bitcount;
1058 s.bufferram >>= bitcount;
1059 s.totalswap >>= bitcount;
1060 s.freeswap >>= bitcount;
1061 s.totalhigh >>= bitcount;
1062 s.freehigh >>= bitcount;
1063 }
1064
1065 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1066 __put_user (s.uptime, &info->uptime) ||
1067 __put_user (s.loads[0], &info->loads[0]) ||
1068 __put_user (s.loads[1], &info->loads[1]) ||
1069 __put_user (s.loads[2], &info->loads[2]) ||
1070 __put_user (s.totalram, &info->totalram) ||
1071 __put_user (s.freeram, &info->freeram) ||
1072 __put_user (s.sharedram, &info->sharedram) ||
1073 __put_user (s.bufferram, &info->bufferram) ||
1074 __put_user (s.totalswap, &info->totalswap) ||
1075 __put_user (s.freeswap, &info->freeswap) ||
1076 __put_user (s.procs, &info->procs) ||
1077 __put_user (s.totalhigh, &info->totalhigh) ||
1078 __put_user (s.freehigh, &info->freehigh) ||
1079 __put_user (s.mem_unit, &info->mem_unit))
1080 return -EFAULT;
1081
1082 return 0;
1083 }
1084
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