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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>
20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
23#include <linux/timex.h>
24#include <linux/export.h>
25#include <linux/migrate.h>
26#include <linux/posix-timers.h>
27#include <linux/times.h>
28#include <linux/ptrace.h>
29#include <linux/gfp.h>
30
31#include <linux/uaccess.h>
32
33int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
34{
35 struct compat_timex tx32;
36
37 if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
38 return -EFAULT;
39
40 txc->modes = tx32.modes;
41 txc->offset = tx32.offset;
42 txc->freq = tx32.freq;
43 txc->maxerror = tx32.maxerror;
44 txc->esterror = tx32.esterror;
45 txc->status = tx32.status;
46 txc->constant = tx32.constant;
47 txc->precision = tx32.precision;
48 txc->tolerance = tx32.tolerance;
49 txc->time.tv_sec = tx32.time.tv_sec;
50 txc->time.tv_usec = tx32.time.tv_usec;
51 txc->tick = tx32.tick;
52 txc->ppsfreq = tx32.ppsfreq;
53 txc->jitter = tx32.jitter;
54 txc->shift = tx32.shift;
55 txc->stabil = tx32.stabil;
56 txc->jitcnt = tx32.jitcnt;
57 txc->calcnt = tx32.calcnt;
58 txc->errcnt = tx32.errcnt;
59 txc->stbcnt = tx32.stbcnt;
60
61 return 0;
62}
63
64int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc)
65{
66 struct compat_timex tx32;
67
68 memset(&tx32, 0, sizeof(struct compat_timex));
69 tx32.modes = txc->modes;
70 tx32.offset = txc->offset;
71 tx32.freq = txc->freq;
72 tx32.maxerror = txc->maxerror;
73 tx32.esterror = txc->esterror;
74 tx32.status = txc->status;
75 tx32.constant = txc->constant;
76 tx32.precision = txc->precision;
77 tx32.tolerance = txc->tolerance;
78 tx32.time.tv_sec = txc->time.tv_sec;
79 tx32.time.tv_usec = txc->time.tv_usec;
80 tx32.tick = txc->tick;
81 tx32.ppsfreq = txc->ppsfreq;
82 tx32.jitter = txc->jitter;
83 tx32.shift = txc->shift;
84 tx32.stabil = txc->stabil;
85 tx32.jitcnt = txc->jitcnt;
86 tx32.calcnt = txc->calcnt;
87 tx32.errcnt = txc->errcnt;
88 tx32.stbcnt = txc->stbcnt;
89 tx32.tai = txc->tai;
90 if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
91 return -EFAULT;
92 return 0;
93}
94
95static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
96{
97 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
98 __get_user(tv->tv_sec, &ctv->tv_sec) ||
99 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
100}
101
102static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
103{
104 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
105 __put_user(tv->tv_sec, &ctv->tv_sec) ||
106 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
107}
108
109static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
110{
111 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
112 __get_user(ts->tv_sec, &cts->tv_sec) ||
113 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
114}
115
116static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
117{
118 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
119 __put_user(ts->tv_sec, &cts->tv_sec) ||
120 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
121}
122
123static int __compat_get_timespec64(struct timespec64 *ts64,
124 const struct compat_timespec __user *cts)
125{
126 struct compat_timespec ts;
127 int ret;
128
129 ret = copy_from_user(&ts, cts, sizeof(ts));
130 if (ret)
131 return -EFAULT;
132
133 ts64->tv_sec = ts.tv_sec;
134 ts64->tv_nsec = ts.tv_nsec;
135
136 return 0;
137}
138
139static int __compat_put_timespec64(const struct timespec64 *ts64,
140 struct compat_timespec __user *cts)
141{
142 struct compat_timespec ts = {
143 .tv_sec = ts64->tv_sec,
144 .tv_nsec = ts64->tv_nsec
145 };
146 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
147}
148
149int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
150{
151 if (COMPAT_USE_64BIT_TIME)
152 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
153 else
154 return __compat_get_timespec64(ts, uts);
155}
156EXPORT_SYMBOL_GPL(compat_get_timespec64);
157
158int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
159{
160 if (COMPAT_USE_64BIT_TIME)
161 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
162 else
163 return __compat_put_timespec64(ts, uts);
164}
165EXPORT_SYMBOL_GPL(compat_put_timespec64);
166
167int compat_get_timeval(struct timeval *tv, const void __user *utv)
168{
169 if (COMPAT_USE_64BIT_TIME)
170 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
171 else
172 return __compat_get_timeval(tv, utv);
173}
174EXPORT_SYMBOL_GPL(compat_get_timeval);
175
176int compat_put_timeval(const struct timeval *tv, void __user *utv)
177{
178 if (COMPAT_USE_64BIT_TIME)
179 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
180 else
181 return __compat_put_timeval(tv, utv);
182}
183EXPORT_SYMBOL_GPL(compat_put_timeval);
184
185int compat_get_timespec(struct timespec *ts, const void __user *uts)
186{
187 if (COMPAT_USE_64BIT_TIME)
188 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
189 else
190 return __compat_get_timespec(ts, uts);
191}
192EXPORT_SYMBOL_GPL(compat_get_timespec);
193
194int compat_put_timespec(const struct timespec *ts, void __user *uts)
195{
196 if (COMPAT_USE_64BIT_TIME)
197 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
198 else
199 return __compat_put_timespec(ts, uts);
200}
201EXPORT_SYMBOL_GPL(compat_put_timespec);
202
203int compat_convert_timespec(struct timespec __user **kts,
204 const void __user *cts)
205{
206 struct timespec ts;
207 struct timespec __user *uts;
208
209 if (!cts || COMPAT_USE_64BIT_TIME) {
210 *kts = (struct timespec __user *)cts;
211 return 0;
212 }
213
214 uts = compat_alloc_user_space(sizeof(ts));
215 if (!uts)
216 return -EFAULT;
217 if (compat_get_timespec(&ts, cts))
218 return -EFAULT;
219 if (copy_to_user(uts, &ts, sizeof(ts)))
220 return -EFAULT;
221
222 *kts = uts;
223 return 0;
224}
225
226int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
227{
228 struct compat_itimerval v32;
229
230 if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
231 return -EFAULT;
232 o->it_interval.tv_sec = v32.it_interval.tv_sec;
233 o->it_interval.tv_usec = v32.it_interval.tv_usec;
234 o->it_value.tv_sec = v32.it_value.tv_sec;
235 o->it_value.tv_usec = v32.it_value.tv_usec;
236 return 0;
237}
238
239int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i)
240{
241 struct compat_itimerval v32;
242
243 v32.it_interval.tv_sec = i->it_interval.tv_sec;
244 v32.it_interval.tv_usec = i->it_interval.tv_usec;
245 v32.it_value.tv_sec = i->it_value.tv_sec;
246 v32.it_value.tv_usec = i->it_value.tv_usec;
247 return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
248}
249
250#ifdef __ARCH_WANT_SYS_SIGPROCMASK
251
252
253
254
255
256static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
257{
258 memcpy(blocked->sig, &set, sizeof(set));
259}
260
261COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
262 compat_old_sigset_t __user *, nset,
263 compat_old_sigset_t __user *, oset)
264{
265 old_sigset_t old_set, new_set;
266 sigset_t new_blocked;
267
268 old_set = current->blocked.sig[0];
269
270 if (nset) {
271 if (get_user(new_set, nset))
272 return -EFAULT;
273 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
274
275 new_blocked = current->blocked;
276
277 switch (how) {
278 case SIG_BLOCK:
279 sigaddsetmask(&new_blocked, new_set);
280 break;
281 case SIG_UNBLOCK:
282 sigdelsetmask(&new_blocked, new_set);
283 break;
284 case SIG_SETMASK:
285 compat_sig_setmask(&new_blocked, new_set);
286 break;
287 default:
288 return -EINVAL;
289 }
290
291 set_current_blocked(&new_blocked);
292 }
293
294 if (oset) {
295 if (put_user(old_set, oset))
296 return -EFAULT;
297 }
298
299 return 0;
300}
301
302#endif
303
304int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
305{
306 struct compat_rusage r32;
307 memset(&r32, 0, sizeof(r32));
308 r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
309 r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
310 r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
311 r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
312 r32.ru_maxrss = r->ru_maxrss;
313 r32.ru_ixrss = r->ru_ixrss;
314 r32.ru_idrss = r->ru_idrss;
315 r32.ru_isrss = r->ru_isrss;
316 r32.ru_minflt = r->ru_minflt;
317 r32.ru_majflt = r->ru_majflt;
318 r32.ru_nswap = r->ru_nswap;
319 r32.ru_inblock = r->ru_inblock;
320 r32.ru_oublock = r->ru_oublock;
321 r32.ru_msgsnd = r->ru_msgsnd;
322 r32.ru_msgrcv = r->ru_msgrcv;
323 r32.ru_nsignals = r->ru_nsignals;
324 r32.ru_nvcsw = r->ru_nvcsw;
325 r32.ru_nivcsw = r->ru_nivcsw;
326 if (copy_to_user(ru, &r32, sizeof(r32)))
327 return -EFAULT;
328 return 0;
329}
330
331static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
332 unsigned len, struct cpumask *new_mask)
333{
334 unsigned long *k;
335
336 if (len < cpumask_size())
337 memset(new_mask, 0, cpumask_size());
338 else if (len > cpumask_size())
339 len = cpumask_size();
340
341 k = cpumask_bits(new_mask);
342 return compat_get_bitmap(k, user_mask_ptr, len * 8);
343}
344
345COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
346 unsigned int, len,
347 compat_ulong_t __user *, user_mask_ptr)
348{
349 cpumask_var_t new_mask;
350 int retval;
351
352 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
353 return -ENOMEM;
354
355 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
356 if (retval)
357 goto out;
358
359 retval = sched_setaffinity(pid, new_mask);
360out:
361 free_cpumask_var(new_mask);
362 return retval;
363}
364
365COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
366 compat_ulong_t __user *, user_mask_ptr)
367{
368 int ret;
369 cpumask_var_t mask;
370
371 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
372 return -EINVAL;
373 if (len & (sizeof(compat_ulong_t)-1))
374 return -EINVAL;
375
376 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
377 return -ENOMEM;
378
379 ret = sched_getaffinity(pid, mask);
380 if (ret == 0) {
381 size_t retlen = min_t(size_t, len, cpumask_size());
382
383 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
384 ret = -EFAULT;
385 else
386 ret = retlen;
387 }
388 free_cpumask_var(mask);
389
390 return ret;
391}
392
393int get_compat_itimerspec(struct itimerspec *dst,
394 const struct compat_itimerspec __user *src)
395{
396 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
397 __compat_get_timespec(&dst->it_value, &src->it_value))
398 return -EFAULT;
399 return 0;
400}
401
402int put_compat_itimerspec(struct compat_itimerspec __user *dst,
403 const struct itimerspec *src)
404{
405 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
406 __compat_put_timespec(&src->it_value, &dst->it_value))
407 return -EFAULT;
408 return 0;
409}
410
411int get_compat_itimerspec64(struct itimerspec64 *its,
412 const struct compat_itimerspec __user *uits)
413{
414
415 if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) ||
416 __compat_get_timespec64(&its->it_value, &uits->it_value))
417 return -EFAULT;
418 return 0;
419}
420EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
421
422int put_compat_itimerspec64(const struct itimerspec64 *its,
423 struct compat_itimerspec __user *uits)
424{
425 if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) ||
426 __compat_put_timespec64(&its->it_value, &uits->it_value))
427 return -EFAULT;
428 return 0;
429}
430EXPORT_SYMBOL_GPL(put_compat_itimerspec64);
431
432
433
434
435
436
437
438
439int get_compat_sigevent(struct sigevent *event,
440 const struct compat_sigevent __user *u_event)
441{
442 memset(event, 0, sizeof(*event));
443 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
444 __get_user(event->sigev_value.sival_int,
445 &u_event->sigev_value.sival_int) ||
446 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
447 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
448 __get_user(event->sigev_notify_thread_id,
449 &u_event->sigev_notify_thread_id))
450 ? -EFAULT : 0;
451}
452
453long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
454 unsigned long bitmap_size)
455{
456 unsigned long nr_compat_longs;
457
458
459 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
460 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
461
462 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
463 return -EFAULT;
464
465 user_access_begin();
466 while (nr_compat_longs > 1) {
467 compat_ulong_t l1, l2;
468 unsafe_get_user(l1, umask++, Efault);
469 unsafe_get_user(l2, umask++, Efault);
470 *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
471 nr_compat_longs -= 2;
472 }
473 if (nr_compat_longs)
474 unsafe_get_user(*mask, umask++, Efault);
475 user_access_end();
476 return 0;
477
478Efault:
479 user_access_end();
480 return -EFAULT;
481}
482
483long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
484 unsigned long bitmap_size)
485{
486 unsigned long nr_compat_longs;
487
488
489 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
490 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
491
492 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
493 return -EFAULT;
494
495 user_access_begin();
496 while (nr_compat_longs > 1) {
497 unsigned long m = *mask++;
498 unsafe_put_user((compat_ulong_t)m, umask++, Efault);
499 unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
500 nr_compat_longs -= 2;
501 }
502 if (nr_compat_longs)
503 unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
504 user_access_end();
505 return 0;
506Efault:
507 user_access_end();
508 return -EFAULT;
509}
510
511void
512sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
513{
514 switch (_NSIG_WORDS) {
515 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
516 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
517 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
518 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
519 }
520}
521EXPORT_SYMBOL_GPL(sigset_from_compat);
522
523void
524sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
525{
526 switch (_NSIG_WORDS) {
527 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
528 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
529 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
530 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
531 }
532}
533
534#ifdef CONFIG_NUMA
535COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
536 compat_uptr_t __user *, pages32,
537 const int __user *, nodes,
538 int __user *, status,
539 int, flags)
540{
541 const void __user * __user *pages;
542 int i;
543
544 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
545 for (i = 0; i < nr_pages; i++) {
546 compat_uptr_t p;
547
548 if (get_user(p, pages32 + i) ||
549 put_user(compat_ptr(p), pages + i))
550 return -EFAULT;
551 }
552 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
553}
554
555COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
556 compat_ulong_t, maxnode,
557 const compat_ulong_t __user *, old_nodes,
558 const compat_ulong_t __user *, new_nodes)
559{
560 unsigned long __user *old = NULL;
561 unsigned long __user *new = NULL;
562 nodemask_t tmp_mask;
563 unsigned long nr_bits;
564 unsigned long size;
565
566 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
567 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
568 if (old_nodes) {
569 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
570 return -EFAULT;
571 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
572 if (new_nodes)
573 new = old + size / sizeof(unsigned long);
574 if (copy_to_user(old, nodes_addr(tmp_mask), size))
575 return -EFAULT;
576 }
577 if (new_nodes) {
578 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
579 return -EFAULT;
580 if (new == NULL)
581 new = compat_alloc_user_space(size);
582 if (copy_to_user(new, nodes_addr(tmp_mask), size))
583 return -EFAULT;
584 }
585 return sys_migrate_pages(pid, nr_bits + 1, old, new);
586}
587#endif
588
589COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
590 compat_pid_t, pid,
591 struct compat_timespec __user *, interval)
592{
593 struct timespec t;
594 int ret;
595 mm_segment_t old_fs = get_fs();
596
597 set_fs(KERNEL_DS);
598 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
599 set_fs(old_fs);
600 if (compat_put_timespec(&t, interval))
601 return -EFAULT;
602 return ret;
603}
604
605
606
607
608
609void __user *compat_alloc_user_space(unsigned long len)
610{
611 void __user *ptr;
612
613
614 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
615 return NULL;
616
617 ptr = arch_compat_alloc_user_space(len);
618
619 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
620 return NULL;
621
622 return ptr;
623}
624EXPORT_SYMBOL_GPL(compat_alloc_user_space);
625
