projects/linux·blob v2.6.32-rc8 · refs

1141 lines · 28.2 KiB

1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
23#include <linux/timex.h>
24#include <linux/migrate.h>
25#include <linux/posix-timers.h>
26#include <linux/times.h>
27#include <linux/ptrace.h>
28
29#include <asm/uaccess.h>
30
31/*
32 * Note that the native side is already converted to a timespec, because
33 * that's what we want anyway.
34 */
35static int compat_get_timeval(struct timespec *o,
36 struct compat_timeval __user *i)
37{
38 long usec;
39
40 if (get_user(o->tv_sec, &i->tv_sec) ||
41 get_user(usec, &i->tv_usec))
42 return -EFAULT;
43 o->tv_nsec = usec * 1000;
44 return 0;
45}
46
47static int compat_put_timeval(struct compat_timeval __user *o,
48 struct timeval *i)
49{
50 return (put_user(i->tv_sec, &o->tv_sec) ||
51 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
52}
53
54asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
55 struct timezone __user *tz)
56{
57 if (tv) {
58 struct timeval ktv;
59 do_gettimeofday(&ktv);
60 if (compat_put_timeval(tv, &ktv))
61 return -EFAULT;
62 }
63 if (tz) {
64 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
65 return -EFAULT;
66 }
67
68 return 0;
69}
70
71asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
72 struct timezone __user *tz)
73{
74 struct timespec kts;
75 struct timezone ktz;
76
77 if (tv) {
78 if (compat_get_timeval(&kts, tv))
79 return -EFAULT;
80 }
81 if (tz) {
82 if (copy_from_user(&ktz, tz, sizeof(ktz)))
83 return -EFAULT;
84 }
85
86 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
87}
88
89int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
90{
91 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
92 __get_user(ts->tv_sec, &cts->tv_sec) ||
93 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
94}
95
96int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
97{
98 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
99 __put_user(ts->tv_sec, &cts->tv_sec) ||
100 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
101}
102
103static long compat_nanosleep_restart(struct restart_block *restart)
104{
105 struct compat_timespec __user *rmtp;
106 struct timespec rmt;
107 mm_segment_t oldfs;
108 long ret;
109
110 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
111 oldfs = get_fs();
112 set_fs(KERNEL_DS);
113 ret = hrtimer_nanosleep_restart(restart);
114 set_fs(oldfs);
115
116 if (ret) {
117 rmtp = restart->nanosleep.compat_rmtp;
118
119 if (rmtp && put_compat_timespec(&rmt, rmtp))
120 return -EFAULT;
121 }
122
123 return ret;
124}
125
126asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
127 struct compat_timespec __user *rmtp)
128{
129 struct timespec tu, rmt;
130 mm_segment_t oldfs;
131 long ret;
132
133 if (get_compat_timespec(&tu, rqtp))
134 return -EFAULT;
135
136 if (!timespec_valid(&tu))
137 return -EINVAL;
138
139 oldfs = get_fs();
140 set_fs(KERNEL_DS);
141 ret = hrtimer_nanosleep(&tu,
142 rmtp ? (struct timespec __user *)&rmt : NULL,
143 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
144 set_fs(oldfs);
145
146 if (ret) {
147 struct restart_block *restart
148 = &current_thread_info()->restart_block;
149
150 restart->fn = compat_nanosleep_restart;
151 restart->nanosleep.compat_rmtp = rmtp;
152
153 if (rmtp && put_compat_timespec(&rmt, rmtp))
154 return -EFAULT;
155 }
156
157 return ret;
158}
159
160static inline long get_compat_itimerval(struct itimerval *o,
161 struct compat_itimerval __user *i)
162{
163 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
164 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
165 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
166 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
167 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
168}
169
170static inline long put_compat_itimerval(struct compat_itimerval __user *o,
171 struct itimerval *i)
172{
173 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
174 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
175 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
176 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
177 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
178}
179
180asmlinkage long compat_sys_getitimer(int which,
181 struct compat_itimerval __user *it)
182{
183 struct itimerval kit;
184 int error;
185
186 error = do_getitimer(which, &kit);
187 if (!error && put_compat_itimerval(it, &kit))
188 error = -EFAULT;
189 return error;
190}
191
192asmlinkage long compat_sys_setitimer(int which,
193 struct compat_itimerval __user *in,
194 struct compat_itimerval __user *out)
195{
196 struct itimerval kin, kout;
197 int error;
198
199 if (in) {
200 if (get_compat_itimerval(&kin, in))
201 return -EFAULT;
202 } else
203 memset(&kin, 0, sizeof(kin));
204
205 error = do_setitimer(which, &kin, out ? &kout : NULL);
206 if (error || !out)
207 return error;
208 if (put_compat_itimerval(out, &kout))
209 return -EFAULT;
210 return 0;
211}
212
213static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
214{
215 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
216}
217
218asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
219{
220 if (tbuf) {
221 struct tms tms;
222 struct compat_tms tmp;
223
224 do_sys_times(&tms);
225 /* Convert our struct tms to the compat version. */
226 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
227 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
228 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
229 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
230 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
231 return -EFAULT;
232 }
233 force_successful_syscall_return();
234 return compat_jiffies_to_clock_t(jiffies);
235}
236
237/*
238 * Assumption: old_sigset_t and compat_old_sigset_t are both
239 * types that can be passed to put_user()/get_user().
240 */
241
242asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
243{
244 old_sigset_t s;
245 long ret;
246 mm_segment_t old_fs = get_fs();
247
248 set_fs(KERNEL_DS);
249 ret = sys_sigpending((old_sigset_t __user *) &s);
250 set_fs(old_fs);
251 if (ret == 0)
252 ret = put_user(s, set);
253 return ret;
254}
255
256asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
257 compat_old_sigset_t __user *oset)
258{
259 old_sigset_t s;
260 long ret;
261 mm_segment_t old_fs;
262
263 if (set && get_user(s, set))
264 return -EFAULT;
265 old_fs = get_fs();
266 set_fs(KERNEL_DS);
267 ret = sys_sigprocmask(how,
268 set ? (old_sigset_t __user *) &s : NULL,
269 oset ? (old_sigset_t __user *) &s : NULL);
270 set_fs(old_fs);
271 if (ret == 0)
272 if (oset)
273 ret = put_user(s, oset);
274 return ret;
275}
276
277asmlinkage long compat_sys_setrlimit(unsigned int resource,
278 struct compat_rlimit __user *rlim)
279{
280 struct rlimit r;
281 int ret;
282 mm_segment_t old_fs = get_fs ();
283
284 if (resource >= RLIM_NLIMITS)
285 return -EINVAL;
286
287 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
288 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
289 __get_user(r.rlim_max, &rlim->rlim_max))
290 return -EFAULT;
291
292 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
293 r.rlim_cur = RLIM_INFINITY;
294 if (r.rlim_max == COMPAT_RLIM_INFINITY)
295 r.rlim_max = RLIM_INFINITY;
296 set_fs(KERNEL_DS);
297 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
298 set_fs(old_fs);
299 return ret;
300}
301
302#ifdef COMPAT_RLIM_OLD_INFINITY
303
304asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
305 struct compat_rlimit __user *rlim)
306{
307 struct rlimit r;
308 int ret;
309 mm_segment_t old_fs = get_fs();
310
311 set_fs(KERNEL_DS);
312 ret = sys_old_getrlimit(resource, &r);
313 set_fs(old_fs);
314
315 if (!ret) {
316 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
317 r.rlim_cur = COMPAT_RLIM_INFINITY;
318 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
319 r.rlim_max = COMPAT_RLIM_INFINITY;
320
321 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
322 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
323 __put_user(r.rlim_max, &rlim->rlim_max))
324 return -EFAULT;
325 }
326 return ret;
327}
328
329#endif
330
331asmlinkage long compat_sys_getrlimit (unsigned int resource,
332 struct compat_rlimit __user *rlim)
333{
334 struct rlimit r;
335 int ret;
336 mm_segment_t old_fs = get_fs();
337
338 set_fs(KERNEL_DS);
339 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
340 set_fs(old_fs);
341 if (!ret) {
342 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
343 r.rlim_cur = COMPAT_RLIM_INFINITY;
344 if (r.rlim_max > COMPAT_RLIM_INFINITY)
345 r.rlim_max = COMPAT_RLIM_INFINITY;
346
347 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
348 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
349 __put_user(r.rlim_max, &rlim->rlim_max))
350 return -EFAULT;
351 }
352 return ret;
353}
354
355int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
356{
357 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
358 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
359 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
360 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
361 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
362 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
363 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
364 __put_user(r->ru_idrss, &ru->ru_idrss) ||
365 __put_user(r->ru_isrss, &ru->ru_isrss) ||
366 __put_user(r->ru_minflt, &ru->ru_minflt) ||
367 __put_user(r->ru_majflt, &ru->ru_majflt) ||
368 __put_user(r->ru_nswap, &ru->ru_nswap) ||
369 __put_user(r->ru_inblock, &ru->ru_inblock) ||
370 __put_user(r->ru_oublock, &ru->ru_oublock) ||
371 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
372 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
373 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
374 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
375 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
376 return -EFAULT;
377 return 0;
378}
379
380asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
381{
382 struct rusage r;
383 int ret;
384 mm_segment_t old_fs = get_fs();
385
386 set_fs(KERNEL_DS);
387 ret = sys_getrusage(who, (struct rusage __user *) &r);
388 set_fs(old_fs);
389
390 if (ret)
391 return ret;
392
393 if (put_compat_rusage(&r, ru))
394 return -EFAULT;
395
396 return 0;
397}
398
399asmlinkage long
400compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
401 struct compat_rusage __user *ru)
402{
403 if (!ru) {
404 return sys_wait4(pid, stat_addr, options, NULL);
405 } else {
406 struct rusage r;
407 int ret;
408 unsigned int status;
409 mm_segment_t old_fs = get_fs();
410
411 set_fs (KERNEL_DS);
412 ret = sys_wait4(pid,
413 (stat_addr ?
414 (unsigned int __user *) &status : NULL),
415 options, (struct rusage __user *) &r);
416 set_fs (old_fs);
417
418 if (ret > 0) {
419 if (put_compat_rusage(&r, ru))
420 return -EFAULT;
421 if (stat_addr && put_user(status, stat_addr))
422 return -EFAULT;
423 }
424 return ret;
425 }
426}
427
428asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
429 struct compat_siginfo __user *uinfo, int options,
430 struct compat_rusage __user *uru)
431{
432 siginfo_t info;
433 struct rusage ru;
434 long ret;
435 mm_segment_t old_fs = get_fs();
436
437 memset(&info, 0, sizeof(info));
438
439 set_fs(KERNEL_DS);
440 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
441 uru ? (struct rusage __user *)&ru : NULL);
442 set_fs(old_fs);
443
444 if ((ret < 0) || (info.si_signo == 0))
445 return ret;
446
447 if (uru) {
448 ret = put_compat_rusage(&ru, uru);
449 if (ret)
450 return ret;
451 }
452
453 BUG_ON(info.si_code & __SI_MASK);
454 info.si_code |= __SI_CHLD;
455 return copy_siginfo_to_user32(uinfo, &info);
456}
457
458static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
459 unsigned len, struct cpumask *new_mask)
460{
461 unsigned long *k;
462
463 if (len < cpumask_size())
464 memset(new_mask, 0, cpumask_size());
465 else if (len > cpumask_size())
466 len = cpumask_size();
467
468 k = cpumask_bits(new_mask);
469 return compat_get_bitmap(k, user_mask_ptr, len * 8);
470}
471
472asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
473 unsigned int len,
474 compat_ulong_t __user *user_mask_ptr)
475{
476 cpumask_var_t new_mask;
477 int retval;
478
479 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
480 return -ENOMEM;
481
482 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
483 if (retval)
484 goto out;
485
486 retval = sched_setaffinity(pid, new_mask);
487out:
488 free_cpumask_var(new_mask);
489 return retval;
490}
491
492asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
493 compat_ulong_t __user *user_mask_ptr)
494{
495 int ret;
496 cpumask_var_t mask;
497 unsigned long *k;
498 unsigned int min_length = cpumask_size();
499
500 if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
501 min_length = sizeof(compat_ulong_t);
502
503 if (len < min_length)
504 return -EINVAL;
505
506 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
507 return -ENOMEM;
508
509 ret = sched_getaffinity(pid, mask);
510 if (ret < 0)
511 goto out;
512
513 k = cpumask_bits(mask);
514 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
515 if (ret == 0)
516 ret = min_length;
517
518out:
519 free_cpumask_var(mask);
520 return ret;
521}
522
523int get_compat_itimerspec(struct itimerspec *dst,
524 const struct compat_itimerspec __user *src)
525{
526 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
527 get_compat_timespec(&dst->it_value, &src->it_value))
528 return -EFAULT;
529 return 0;
530}
531
532int put_compat_itimerspec(struct compat_itimerspec __user *dst,
533 const struct itimerspec *src)
534{
535 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
536 put_compat_timespec(&src->it_value, &dst->it_value))
537 return -EFAULT;
538 return 0;
539}
540
541long compat_sys_timer_create(clockid_t which_clock,
542 struct compat_sigevent __user *timer_event_spec,
543 timer_t __user *created_timer_id)
544{
545 struct sigevent __user *event = NULL;
546
547 if (timer_event_spec) {
548 struct sigevent kevent;
549
550 event = compat_alloc_user_space(sizeof(*event));
551 if (get_compat_sigevent(&kevent, timer_event_spec) ||
552 copy_to_user(event, &kevent, sizeof(*event)))
553 return -EFAULT;
554 }
555
556 return sys_timer_create(which_clock, event, created_timer_id);
557}
558
559long compat_sys_timer_settime(timer_t timer_id, int flags,
560 struct compat_itimerspec __user *new,
561 struct compat_itimerspec __user *old)
562{
563 long err;
564 mm_segment_t oldfs;
565 struct itimerspec newts, oldts;
566
567 if (!new)
568 return -EINVAL;
569 if (get_compat_itimerspec(&newts, new))
570 return -EFAULT;
571 oldfs = get_fs();
572 set_fs(KERNEL_DS);
573 err = sys_timer_settime(timer_id, flags,
574 (struct itimerspec __user *) &newts,
575 (struct itimerspec __user *) &oldts);
576 set_fs(oldfs);
577 if (!err && old && put_compat_itimerspec(old, &oldts))
578 return -EFAULT;
579 return err;
580}
581
582long compat_sys_timer_gettime(timer_t timer_id,
583 struct compat_itimerspec __user *setting)
584{
585 long err;
586 mm_segment_t oldfs;
587 struct itimerspec ts;
588
589 oldfs = get_fs();
590 set_fs(KERNEL_DS);
591 err = sys_timer_gettime(timer_id,
592 (struct itimerspec __user *) &ts);
593 set_fs(oldfs);
594 if (!err && put_compat_itimerspec(setting, &ts))
595 return -EFAULT;
596 return err;
597}
598
599long compat_sys_clock_settime(clockid_t which_clock,
600 struct compat_timespec __user *tp)
601{
602 long err;
603 mm_segment_t oldfs;
604 struct timespec ts;
605
606 if (get_compat_timespec(&ts, tp))
607 return -EFAULT;
608 oldfs = get_fs();
609 set_fs(KERNEL_DS);
610 err = sys_clock_settime(which_clock,
611 (struct timespec __user *) &ts);
612 set_fs(oldfs);
613 return err;
614}
615
616long compat_sys_clock_gettime(clockid_t which_clock,
617 struct compat_timespec __user *tp)
618{
619 long err;
620 mm_segment_t oldfs;
621 struct timespec ts;
622
623 oldfs = get_fs();
624 set_fs(KERNEL_DS);
625 err = sys_clock_gettime(which_clock,
626 (struct timespec __user *) &ts);
627 set_fs(oldfs);
628 if (!err && put_compat_timespec(&ts, tp))
629 return -EFAULT;
630 return err;
631}
632
633long compat_sys_clock_getres(clockid_t which_clock,
634 struct compat_timespec __user *tp)
635{
636 long err;
637 mm_segment_t oldfs;
638 struct timespec ts;
639
640 oldfs = get_fs();
641 set_fs(KERNEL_DS);
642 err = sys_clock_getres(which_clock,
643 (struct timespec __user *) &ts);
644 set_fs(oldfs);
645 if (!err && tp && put_compat_timespec(&ts, tp))
646 return -EFAULT;
647 return err;
648}
649
650static long compat_clock_nanosleep_restart(struct restart_block *restart)
651{
652 long err;
653 mm_segment_t oldfs;
654 struct timespec tu;
655 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
656
657 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
658 oldfs = get_fs();
659 set_fs(KERNEL_DS);
660 err = clock_nanosleep_restart(restart);
661 set_fs(oldfs);
662
663 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
664 put_compat_timespec(&tu, rmtp))
665 return -EFAULT;
666
667 if (err == -ERESTART_RESTARTBLOCK) {
668 restart->fn = compat_clock_nanosleep_restart;
669 restart->nanosleep.compat_rmtp = rmtp;
670 }
671 return err;
672}
673
674long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
675 struct compat_timespec __user *rqtp,
676 struct compat_timespec __user *rmtp)
677{
678 long err;
679 mm_segment_t oldfs;
680 struct timespec in, out;
681 struct restart_block *restart;
682
683 if (get_compat_timespec(&in, rqtp))
684 return -EFAULT;
685
686 oldfs = get_fs();
687 set_fs(KERNEL_DS);
688 err = sys_clock_nanosleep(which_clock, flags,
689 (struct timespec __user *) &in,
690 (struct timespec __user *) &out);
691 set_fs(oldfs);
692
693 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
694 put_compat_timespec(&out, rmtp))
695 return -EFAULT;
696
697 if (err == -ERESTART_RESTARTBLOCK) {
698 restart = &current_thread_info()->restart_block;
699 restart->fn = compat_clock_nanosleep_restart;
700 restart->nanosleep.compat_rmtp = rmtp;
701 }
702 return err;
703}
704
705/*
706 * We currently only need the following fields from the sigevent
707 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
708 * sigev_notify_thread_id). The others are handled in user mode.
709 * We also assume that copying sigev_value.sival_int is sufficient
710 * to keep all the bits of sigev_value.sival_ptr intact.
711 */
712int get_compat_sigevent(struct sigevent *event,
713 const struct compat_sigevent __user *u_event)
714{
715 memset(event, 0, sizeof(*event));
716 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
717 __get_user(event->sigev_value.sival_int,
718 &u_event->sigev_value.sival_int) ||
719 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
720 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
721 __get_user(event->sigev_notify_thread_id,
722 &u_event->sigev_notify_thread_id))
723 ? -EFAULT : 0;
724}
725
726long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
727 unsigned long bitmap_size)
728{
729 int i, j;
730 unsigned long m;
731 compat_ulong_t um;
732 unsigned long nr_compat_longs;
733
734 /* align bitmap up to nearest compat_long_t boundary */
735 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
736
737 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
738 return -EFAULT;
739
740 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
741
742 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
743 m = 0;
744
745 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
746 /*
747 * We dont want to read past the end of the userspace
748 * bitmap. We must however ensure the end of the
749 * kernel bitmap is zeroed.
750 */
751 if (nr_compat_longs-- > 0) {
752 if (__get_user(um, umask))
753 return -EFAULT;
754 } else {
755 um = 0;
756 }
757
758 umask++;
759 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
760 }
761 *mask++ = m;
762 }
763
764 return 0;
765}
766
767long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
768 unsigned long bitmap_size)
769{
770 int i, j;
771 unsigned long m;
772 compat_ulong_t um;
773 unsigned long nr_compat_longs;
774
775 /* align bitmap up to nearest compat_long_t boundary */
776 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
777
778 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
779 return -EFAULT;
780
781 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
782
783 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
784 m = *mask++;
785
786 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
787 um = m;
788
789 /*
790 * We dont want to write past the end of the userspace
791 * bitmap.
792 */
793 if (nr_compat_longs-- > 0) {
794 if (__put_user(um, umask))
795 return -EFAULT;
796 }
797
798 umask++;
799 m >>= 4*sizeof(um);
800 m >>= 4*sizeof(um);
801 }
802 }
803
804 return 0;
805}
806
807void
808sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
809{
810 switch (_NSIG_WORDS) {
811 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
812 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
813 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
814 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
815 }
816}
817
818asmlinkage long
819compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
820 struct compat_siginfo __user *uinfo,
821 struct compat_timespec __user *uts, compat_size_t sigsetsize)
822{
823 compat_sigset_t s32;
824 sigset_t s;
825 int sig;
826 struct timespec t;
827 siginfo_t info;
828 long ret, timeout = 0;
829
830 if (sigsetsize != sizeof(sigset_t))
831 return -EINVAL;
832
833 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
834 return -EFAULT;
835 sigset_from_compat(&s, &s32);
836 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
837 signotset(&s);
838
839 if (uts) {
840 if (get_compat_timespec (&t, uts))
841 return -EFAULT;
842 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
843 || t.tv_sec < 0)
844 return -EINVAL;
845 }
846
847 spin_lock_irq(&current->sighand->siglock);
848 sig = dequeue_signal(current, &s, &info);
849 if (!sig) {
850 timeout = MAX_SCHEDULE_TIMEOUT;
851 if (uts)
852 timeout = timespec_to_jiffies(&t)
853 +(t.tv_sec || t.tv_nsec);
854 if (timeout) {
855 current->real_blocked = current->blocked;
856 sigandsets(&current->blocked, &current->blocked, &s);
857
858 recalc_sigpending();
859 spin_unlock_irq(&current->sighand->siglock);
860
861 timeout = schedule_timeout_interruptible(timeout);
862
863 spin_lock_irq(&current->sighand->siglock);
864 sig = dequeue_signal(current, &s, &info);
865 current->blocked = current->real_blocked;
866 siginitset(&current->real_blocked, 0);
867 recalc_sigpending();
868 }
869 }
870 spin_unlock_irq(&current->sighand->siglock);
871
872 if (sig) {
873 ret = sig;
874 if (uinfo) {
875 if (copy_siginfo_to_user32(uinfo, &info))
876 ret = -EFAULT;
877 }
878 }else {
879 ret = timeout?-EINTR:-EAGAIN;
880 }
881 return ret;
882
883}
884
885asmlinkage long
886compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
887 struct compat_siginfo __user *uinfo)
888{
889 siginfo_t info;
890
891 if (copy_siginfo_from_user32(&info, uinfo))
892 return -EFAULT;
893 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
894}
895
896#ifdef __ARCH_WANT_COMPAT_SYS_TIME
897
898/* compat_time_t is a 32 bit "long" and needs to get converted. */
899
900asmlinkage long compat_sys_time(compat_time_t __user * tloc)
901{
902 compat_time_t i;
903 struct timeval tv;
904
905 do_gettimeofday(&tv);
906 i = tv.tv_sec;
907
908 if (tloc) {
909 if (put_user(i,tloc))
910 return -EFAULT;
911 }
912 force_successful_syscall_return();
913 return i;
914}
915
916asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
917{
918 struct timespec tv;
919 int err;
920
921 if (get_user(tv.tv_sec, tptr))
922 return -EFAULT;
923
924 tv.tv_nsec = 0;
925
926 err = security_settime(&tv, NULL);
927 if (err)
928 return err;
929
930 do_settimeofday(&tv);
931 return 0;
932}
933
934#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
935
936#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
937asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
938{
939 sigset_t newset;
940 compat_sigset_t newset32;
941
942 /* XXX: Don't preclude handling different sized sigset_t's. */
943 if (sigsetsize != sizeof(sigset_t))
944 return -EINVAL;
945
946 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
947 return -EFAULT;
948 sigset_from_compat(&newset, &newset32);
949 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
950
951 spin_lock_irq(&current->sighand->siglock);
952 current->saved_sigmask = current->blocked;
953 current->blocked = newset;
954 recalc_sigpending();
955 spin_unlock_irq(&current->sighand->siglock);
956
957 current->state = TASK_INTERRUPTIBLE;
958 schedule();
959 set_restore_sigmask();
960 return -ERESTARTNOHAND;
961}
962#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
963
964asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
965{
966 struct timex txc;
967 int ret;
968
969 memset(&txc, 0, sizeof(struct timex));
970
971 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
972 __get_user(txc.modes, &utp->modes) ||
973 __get_user(txc.offset, &utp->offset) ||
974 __get_user(txc.freq, &utp->freq) ||
975 __get_user(txc.maxerror, &utp->maxerror) ||
976 __get_user(txc.esterror, &utp->esterror) ||
977 __get_user(txc.status, &utp->status) ||
978 __get_user(txc.constant, &utp->constant) ||
979 __get_user(txc.precision, &utp->precision) ||
980 __get_user(txc.tolerance, &utp->tolerance) ||
981 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
982 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
983 __get_user(txc.tick, &utp->tick) ||
984 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
985 __get_user(txc.jitter, &utp->jitter) ||
986 __get_user(txc.shift, &utp->shift) ||
987 __get_user(txc.stabil, &utp->stabil) ||
988 __get_user(txc.jitcnt, &utp->jitcnt) ||
989 __get_user(txc.calcnt, &utp->calcnt) ||
990 __get_user(txc.errcnt, &utp->errcnt) ||
991 __get_user(txc.stbcnt, &utp->stbcnt))
992 return -EFAULT;
993
994 ret = do_adjtimex(&txc);
995
996 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
997 __put_user(txc.modes, &utp->modes) ||
998 __put_user(txc.offset, &utp->offset) ||
999 __put_user(txc.freq, &utp->freq) ||
1000 __put_user(txc.maxerror, &utp->maxerror) ||
1001 __put_user(txc.esterror, &utp->esterror) ||
1002 __put_user(txc.status, &utp->status) ||
1003 __put_user(txc.constant, &utp->constant) ||
1004 __put_user(txc.precision, &utp->precision) ||
1005 __put_user(txc.tolerance, &utp->tolerance) ||
1006 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1007 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1008 __put_user(txc.tick, &utp->tick) ||
1009 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1010 __put_user(txc.jitter, &utp->jitter) ||
1011 __put_user(txc.shift, &utp->shift) ||
1012 __put_user(txc.stabil, &utp->stabil) ||
1013 __put_user(txc.jitcnt, &utp->jitcnt) ||
1014 __put_user(txc.calcnt, &utp->calcnt) ||
1015 __put_user(txc.errcnt, &utp->errcnt) ||
1016 __put_user(txc.stbcnt, &utp->stbcnt) ||
1017 __put_user(txc.tai, &utp->tai))
1018 ret = -EFAULT;
1019
1020 return ret;
1021}
1022
1023#ifdef CONFIG_NUMA
1024asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1025 compat_uptr_t __user *pages32,
1026 const int __user *nodes,
1027 int __user *status,
1028 int flags)
1029{
1030 const void __user * __user *pages;
1031 int i;
1032
1033 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034 for (i = 0; i < nr_pages; i++) {
1035 compat_uptr_t p;
1036
1037 if (get_user(p, pages32 + i) ||
1038 put_user(compat_ptr(p), pages + i))
1039 return -EFAULT;
1040 }
1041 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042}
1043
1044asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045 compat_ulong_t maxnode,
1046 const compat_ulong_t __user *old_nodes,
1047 const compat_ulong_t __user *new_nodes)
1048{
1049 unsigned long __user *old = NULL;
1050 unsigned long __user *new = NULL;
1051 nodemask_t tmp_mask;
1052 unsigned long nr_bits;
1053 unsigned long size;
1054
1055 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057 if (old_nodes) {
1058 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059 return -EFAULT;
1060 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061 if (new_nodes)
1062 new = old + size / sizeof(unsigned long);
1063 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064 return -EFAULT;
1065 }
1066 if (new_nodes) {
1067 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068 return -EFAULT;
1069 if (new == NULL)
1070 new = compat_alloc_user_space(size);
1071 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072 return -EFAULT;
1073 }
1074 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075}
1076#endif
1077
1078struct compat_sysinfo {
1079 s32 uptime;
1080 u32 loads[3];
1081 u32 totalram;
1082 u32 freeram;
1083 u32 sharedram;
1084 u32 bufferram;
1085 u32 totalswap;
1086 u32 freeswap;
1087 u16 procs;
1088 u16 pad;
1089 u32 totalhigh;
1090 u32 freehigh;
1091 u32 mem_unit;
1092 char _f[20-2*sizeof(u32)-sizeof(int)];
1093};
1094
1095asmlinkage long
1096compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097{
1098 struct sysinfo s;
1099
1100 do_sysinfo(&s);
1101
1102 /* Check to see if any memory value is too large for 32-bit and scale
1103 * down if needed
1104 */
1105 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106 int bitcount = 0;
1107
1108 while (s.mem_unit < PAGE_SIZE) {
1109 s.mem_unit <<= 1;
1110 bitcount++;
1111 }
1112
1113 s.totalram >>= bitcount;
1114 s.freeram >>= bitcount;
1115 s.sharedram >>= bitcount;
1116 s.bufferram >>= bitcount;
1117 s.totalswap >>= bitcount;
1118 s.freeswap >>= bitcount;
1119 s.totalhigh >>= bitcount;
1120 s.freehigh >>= bitcount;
1121 }
1122
1123 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124 __put_user (s.uptime, &info->uptime) ||
1125 __put_user (s.loads[0], &info->loads[0]) ||
1126 __put_user (s.loads[1], &info->loads[1]) ||
1127 __put_user (s.loads[2], &info->loads[2]) ||
1128 __put_user (s.totalram, &info->totalram) ||
1129 __put_user (s.freeram, &info->freeram) ||
1130 __put_user (s.sharedram, &info->sharedram) ||
1131 __put_user (s.bufferram, &info->bufferram) ||
1132 __put_user (s.totalswap, &info->totalswap) ||
1133 __put_user (s.freeswap, &info->freeswap) ||
1134 __put_user (s.procs, &info->procs) ||
1135 __put_user (s.totalhigh, &info->totalhigh) ||
1136 __put_user (s.freehigh, &info->freehigh) ||
1137 __put_user (s.mem_unit, &info->mem_unit))
1138 return -EFAULT;
1139
1140 return 0;
1141}