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time/posix-timers: Move the compat copyouts to the nanosleep implementations
[mirror_ubuntu-hirsute-kernel.git] / kernel / compat.c
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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/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
33static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
34{
35 memset(txc, 0, sizeof(struct timex));
36
37 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
38 __get_user(txc->modes, &utp->modes) ||
39 __get_user(txc->offset, &utp->offset) ||
40 __get_user(txc->freq, &utp->freq) ||
41 __get_user(txc->maxerror, &utp->maxerror) ||
42 __get_user(txc->esterror, &utp->esterror) ||
43 __get_user(txc->status, &utp->status) ||
44 __get_user(txc->constant, &utp->constant) ||
45 __get_user(txc->precision, &utp->precision) ||
46 __get_user(txc->tolerance, &utp->tolerance) ||
47 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
48 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
49 __get_user(txc->tick, &utp->tick) ||
50 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
51 __get_user(txc->jitter, &utp->jitter) ||
52 __get_user(txc->shift, &utp->shift) ||
53 __get_user(txc->stabil, &utp->stabil) ||
54 __get_user(txc->jitcnt, &utp->jitcnt) ||
55 __get_user(txc->calcnt, &utp->calcnt) ||
56 __get_user(txc->errcnt, &utp->errcnt) ||
57 __get_user(txc->stbcnt, &utp->stbcnt))
58 return -EFAULT;
59
60 return 0;
61}
62
63static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
64{
65 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
66 __put_user(txc->modes, &utp->modes) ||
67 __put_user(txc->offset, &utp->offset) ||
68 __put_user(txc->freq, &utp->freq) ||
69 __put_user(txc->maxerror, &utp->maxerror) ||
70 __put_user(txc->esterror, &utp->esterror) ||
71 __put_user(txc->status, &utp->status) ||
72 __put_user(txc->constant, &utp->constant) ||
73 __put_user(txc->precision, &utp->precision) ||
74 __put_user(txc->tolerance, &utp->tolerance) ||
75 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
76 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
77 __put_user(txc->tick, &utp->tick) ||
78 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
79 __put_user(txc->jitter, &utp->jitter) ||
80 __put_user(txc->shift, &utp->shift) ||
81 __put_user(txc->stabil, &utp->stabil) ||
82 __put_user(txc->jitcnt, &utp->jitcnt) ||
83 __put_user(txc->calcnt, &utp->calcnt) ||
84 __put_user(txc->errcnt, &utp->errcnt) ||
85 __put_user(txc->stbcnt, &utp->stbcnt) ||
86 __put_user(txc->tai, &utp->tai))
87 return -EFAULT;
88 return 0;
89}
90
91COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
92 struct timezone __user *, tz)
93{
94 if (tv) {
95 struct timeval ktv;
96 do_gettimeofday(&ktv);
97 if (compat_put_timeval(&ktv, tv))
98 return -EFAULT;
99 }
100 if (tz) {
101 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
102 return -EFAULT;
103 }
104
105 return 0;
106}
107
108COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109 struct timezone __user *, tz)
110{
111 struct timespec64 new_ts;
112 struct timeval user_tv;
113 struct timezone new_tz;
114
115 if (tv) {
116 if (compat_get_timeval(&user_tv, tv))
117 return -EFAULT;
118 new_ts.tv_sec = user_tv.tv_sec;
119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
120 }
121 if (tz) {
122 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
123 return -EFAULT;
124 }
125
126 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
127}
128
129static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
130{
131 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
132 __get_user(tv->tv_sec, &ctv->tv_sec) ||
133 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
134}
135
136static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
137{
138 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
139 __put_user(tv->tv_sec, &ctv->tv_sec) ||
140 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
141}
142
143static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
144{
145 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
146 __get_user(ts->tv_sec, &cts->tv_sec) ||
147 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
148}
149
150static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
151{
152 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
153 __put_user(ts->tv_sec, &cts->tv_sec) ||
154 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
155}
156
157int compat_get_timeval(struct timeval *tv, const void __user *utv)
158{
159 if (COMPAT_USE_64BIT_TIME)
160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
161 else
162 return __compat_get_timeval(tv, utv);
163}
164EXPORT_SYMBOL_GPL(compat_get_timeval);
165
166int compat_put_timeval(const struct timeval *tv, void __user *utv)
167{
168 if (COMPAT_USE_64BIT_TIME)
169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
170 else
171 return __compat_put_timeval(tv, utv);
172}
173EXPORT_SYMBOL_GPL(compat_put_timeval);
174
175int compat_get_timespec(struct timespec *ts, const void __user *uts)
176{
177 if (COMPAT_USE_64BIT_TIME)
178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
179 else
180 return __compat_get_timespec(ts, uts);
181}
182EXPORT_SYMBOL_GPL(compat_get_timespec);
183
184int compat_put_timespec(const struct timespec *ts, void __user *uts)
185{
186 if (COMPAT_USE_64BIT_TIME)
187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
188 else
189 return __compat_put_timespec(ts, uts);
190}
191EXPORT_SYMBOL_GPL(compat_put_timespec);
192
193int compat_convert_timespec(struct timespec __user **kts,
194 const void __user *cts)
195{
196 struct timespec ts;
197 struct timespec __user *uts;
198
199 if (!cts || COMPAT_USE_64BIT_TIME) {
200 *kts = (struct timespec __user *)cts;
201 return 0;
202 }
203
204 uts = compat_alloc_user_space(sizeof(ts));
205 if (!uts)
206 return -EFAULT;
207 if (compat_get_timespec(&ts, cts))
208 return -EFAULT;
209 if (copy_to_user(uts, &ts, sizeof(ts)))
210 return -EFAULT;
211
212 *kts = uts;
213 return 0;
214}
215
216static inline long get_compat_itimerval(struct itimerval *o,
217 struct compat_itimerval __user *i)
218{
219 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
220 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
221 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
222 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
223 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
224}
225
226static inline long put_compat_itimerval(struct compat_itimerval __user *o,
227 struct itimerval *i)
228{
229 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
230 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
231 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
232 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
233 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
234}
235
236asmlinkage long sys_ni_posix_timers(void);
237
238COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
239 struct compat_itimerval __user *, it)
240{
241 struct itimerval kit;
242 int error;
243
244 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
245 return sys_ni_posix_timers();
246
247 error = do_getitimer(which, &kit);
248 if (!error && put_compat_itimerval(it, &kit))
249 error = -EFAULT;
250 return error;
251}
252
253COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
254 struct compat_itimerval __user *, in,
255 struct compat_itimerval __user *, out)
256{
257 struct itimerval kin, kout;
258 int error;
259
260 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
261 return sys_ni_posix_timers();
262
263 if (in) {
264 if (get_compat_itimerval(&kin, in))
265 return -EFAULT;
266 } else
267 memset(&kin, 0, sizeof(kin));
268
269 error = do_setitimer(which, &kin, out ? &kout : NULL);
270 if (error || !out)
271 return error;
272 if (put_compat_itimerval(out, &kout))
273 return -EFAULT;
274 return 0;
275}
276
277static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
278{
279 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
280}
281
282COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
283{
284 if (tbuf) {
285 struct tms tms;
286 struct compat_tms tmp;
287
288 do_sys_times(&tms);
289 /* Convert our struct tms to the compat version. */
290 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
291 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
292 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
293 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
294 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
295 return -EFAULT;
296 }
297 force_successful_syscall_return();
298 return compat_jiffies_to_clock_t(jiffies);
299}
300
301#ifdef __ARCH_WANT_SYS_SIGPENDING
302
303/*
304 * Assumption: old_sigset_t and compat_old_sigset_t are both
305 * types that can be passed to put_user()/get_user().
306 */
307
308COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
309{
310 old_sigset_t s;
311 long ret;
312 mm_segment_t old_fs = get_fs();
313
314 set_fs(KERNEL_DS);
315 ret = sys_sigpending((old_sigset_t __user *) &s);
316 set_fs(old_fs);
317 if (ret == 0)
318 ret = put_user(s, set);
319 return ret;
320}
321
322#endif
323
324#ifdef __ARCH_WANT_SYS_SIGPROCMASK
325
326/*
327 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
328 * blocked set of signals to the supplied signal set
329 */
330static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
331{
332 memcpy(blocked->sig, &set, sizeof(set));
333}
334
335COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
336 compat_old_sigset_t __user *, nset,
337 compat_old_sigset_t __user *, oset)
338{
339 old_sigset_t old_set, new_set;
340 sigset_t new_blocked;
341
342 old_set = current->blocked.sig[0];
343
344 if (nset) {
345 if (get_user(new_set, nset))
346 return -EFAULT;
347 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
348
349 new_blocked = current->blocked;
350
351 switch (how) {
352 case SIG_BLOCK:
353 sigaddsetmask(&new_blocked, new_set);
354 break;
355 case SIG_UNBLOCK:
356 sigdelsetmask(&new_blocked, new_set);
357 break;
358 case SIG_SETMASK:
359 compat_sig_setmask(&new_blocked, new_set);
360 break;
361 default:
362 return -EINVAL;
363 }
364
365 set_current_blocked(&new_blocked);
366 }
367
368 if (oset) {
369 if (put_user(old_set, oset))
370 return -EFAULT;
371 }
372
373 return 0;
374}
375
376#endif
377
378COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
379 struct compat_rlimit __user *, rlim)
380{
381 struct rlimit r;
382
383 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
384 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
385 __get_user(r.rlim_max, &rlim->rlim_max))
386 return -EFAULT;
387
388 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
389 r.rlim_cur = RLIM_INFINITY;
390 if (r.rlim_max == COMPAT_RLIM_INFINITY)
391 r.rlim_max = RLIM_INFINITY;
392 return do_prlimit(current, resource, &r, NULL);
393}
394
395#ifdef COMPAT_RLIM_OLD_INFINITY
396
397COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
398 struct compat_rlimit __user *, rlim)
399{
400 struct rlimit r;
401 int ret;
402 mm_segment_t old_fs = get_fs();
403
404 set_fs(KERNEL_DS);
405 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
406 set_fs(old_fs);
407
408 if (!ret) {
409 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
410 r.rlim_cur = COMPAT_RLIM_INFINITY;
411 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
412 r.rlim_max = COMPAT_RLIM_INFINITY;
413
414 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
415 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
416 __put_user(r.rlim_max, &rlim->rlim_max))
417 return -EFAULT;
418 }
419 return ret;
420}
421
422#endif
423
424COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
425 struct compat_rlimit __user *, rlim)
426{
427 struct rlimit r;
428 int ret;
429
430 ret = do_prlimit(current, resource, NULL, &r);
431 if (!ret) {
432 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
433 r.rlim_cur = COMPAT_RLIM_INFINITY;
434 if (r.rlim_max > COMPAT_RLIM_INFINITY)
435 r.rlim_max = COMPAT_RLIM_INFINITY;
436
437 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
438 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
439 __put_user(r.rlim_max, &rlim->rlim_max))
440 return -EFAULT;
441 }
442 return ret;
443}
444
445int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
446{
447 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
448 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
449 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
450 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
451 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
452 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
453 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
454 __put_user(r->ru_idrss, &ru->ru_idrss) ||
455 __put_user(r->ru_isrss, &ru->ru_isrss) ||
456 __put_user(r->ru_minflt, &ru->ru_minflt) ||
457 __put_user(r->ru_majflt, &ru->ru_majflt) ||
458 __put_user(r->ru_nswap, &ru->ru_nswap) ||
459 __put_user(r->ru_inblock, &ru->ru_inblock) ||
460 __put_user(r->ru_oublock, &ru->ru_oublock) ||
461 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
462 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
463 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
464 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
465 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
466 return -EFAULT;
467 return 0;
468}
469
470COMPAT_SYSCALL_DEFINE4(wait4,
471 compat_pid_t, pid,
472 compat_uint_t __user *, stat_addr,
473 int, options,
474 struct compat_rusage __user *, ru)
475{
476 if (!ru) {
477 return sys_wait4(pid, stat_addr, options, NULL);
478 } else {
479 struct rusage r;
480 int ret;
481 unsigned int status;
482 mm_segment_t old_fs = get_fs();
483
484 set_fs (KERNEL_DS);
485 ret = sys_wait4(pid,
486 (stat_addr ?
487 (unsigned int __user *) &status : NULL),
488 options, (struct rusage __user *) &r);
489 set_fs (old_fs);
490
491 if (ret > 0) {
492 if (put_compat_rusage(&r, ru))
493 return -EFAULT;
494 if (stat_addr && put_user(status, stat_addr))
495 return -EFAULT;
496 }
497 return ret;
498 }
499}
500
501COMPAT_SYSCALL_DEFINE5(waitid,
502 int, which, compat_pid_t, pid,
503 struct compat_siginfo __user *, uinfo, int, options,
504 struct compat_rusage __user *, uru)
505{
506 siginfo_t info;
507 struct rusage ru;
508 long ret;
509 mm_segment_t old_fs = get_fs();
510
511 memset(&info, 0, sizeof(info));
512
513 set_fs(KERNEL_DS);
514 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
515 uru ? (struct rusage __user *)&ru : NULL);
516 set_fs(old_fs);
517
518 if ((ret < 0) || (info.si_signo == 0))
519 return ret;
520
521 if (uru) {
522 /* sys_waitid() overwrites everything in ru */
523 if (COMPAT_USE_64BIT_TIME)
524 ret = copy_to_user(uru, &ru, sizeof(ru));
525 else
526 ret = put_compat_rusage(&ru, uru);
527 if (ret)
528 return -EFAULT;
529 }
530
531 BUG_ON(info.si_code & __SI_MASK);
532 info.si_code |= __SI_CHLD;
533 return copy_siginfo_to_user32(uinfo, &info);
534}
535
536static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
537 unsigned len, struct cpumask *new_mask)
538{
539 unsigned long *k;
540
541 if (len < cpumask_size())
542 memset(new_mask, 0, cpumask_size());
543 else if (len > cpumask_size())
544 len = cpumask_size();
545
546 k = cpumask_bits(new_mask);
547 return compat_get_bitmap(k, user_mask_ptr, len * 8);
548}
549
550COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
551 unsigned int, len,
552 compat_ulong_t __user *, user_mask_ptr)
553{
554 cpumask_var_t new_mask;
555 int retval;
556
557 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
558 return -ENOMEM;
559
560 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
561 if (retval)
562 goto out;
563
564 retval = sched_setaffinity(pid, new_mask);
565out:
566 free_cpumask_var(new_mask);
567 return retval;
568}
569
570COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
571 compat_ulong_t __user *, user_mask_ptr)
572{
573 int ret;
574 cpumask_var_t mask;
575
576 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
577 return -EINVAL;
578 if (len & (sizeof(compat_ulong_t)-1))
579 return -EINVAL;
580
581 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
582 return -ENOMEM;
583
584 ret = sched_getaffinity(pid, mask);
585 if (ret == 0) {
586 size_t retlen = min_t(size_t, len, cpumask_size());
587
588 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
589 ret = -EFAULT;
590 else
591 ret = retlen;
592 }
593 free_cpumask_var(mask);
594
595 return ret;
596}
597
598int get_compat_itimerspec(struct itimerspec *dst,
599 const struct compat_itimerspec __user *src)
600{
601 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
602 __compat_get_timespec(&dst->it_value, &src->it_value))
603 return -EFAULT;
604 return 0;
605}
606
607int put_compat_itimerspec(struct compat_itimerspec __user *dst,
608 const struct itimerspec *src)
609{
610 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
611 __compat_put_timespec(&src->it_value, &dst->it_value))
612 return -EFAULT;
613 return 0;
614}
615
616COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
617 struct compat_sigevent __user *, timer_event_spec,
618 timer_t __user *, created_timer_id)
619{
620 struct sigevent __user *event = NULL;
621
622 if (timer_event_spec) {
623 struct sigevent kevent;
624
625 event = compat_alloc_user_space(sizeof(*event));
626 if (get_compat_sigevent(&kevent, timer_event_spec) ||
627 copy_to_user(event, &kevent, sizeof(*event)))
628 return -EFAULT;
629 }
630
631 return sys_timer_create(which_clock, event, created_timer_id);
632}
633
634COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
635 struct compat_itimerspec __user *, new,
636 struct compat_itimerspec __user *, old)
637{
638 long err;
639 mm_segment_t oldfs;
640 struct itimerspec newts, oldts;
641
642 if (!new)
643 return -EINVAL;
644 if (get_compat_itimerspec(&newts, new))
645 return -EFAULT;
646 oldfs = get_fs();
647 set_fs(KERNEL_DS);
648 err = sys_timer_settime(timer_id, flags,
649 (struct itimerspec __user *) &newts,
650 (struct itimerspec __user *) &oldts);
651 set_fs(oldfs);
652 if (!err && old && put_compat_itimerspec(old, &oldts))
653 return -EFAULT;
654 return err;
655}
656
657COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
658 struct compat_itimerspec __user *, setting)
659{
660 long err;
661 mm_segment_t oldfs;
662 struct itimerspec ts;
663
664 oldfs = get_fs();
665 set_fs(KERNEL_DS);
666 err = sys_timer_gettime(timer_id,
667 (struct itimerspec __user *) &ts);
668 set_fs(oldfs);
669 if (!err && put_compat_itimerspec(setting, &ts))
670 return -EFAULT;
671 return err;
672}
673
674COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
675 struct compat_timespec __user *, tp)
676{
677 long err;
678 mm_segment_t oldfs;
679 struct timespec ts;
680
681 if (compat_get_timespec(&ts, tp))
682 return -EFAULT;
683 oldfs = get_fs();
684 set_fs(KERNEL_DS);
685 err = sys_clock_settime(which_clock,
686 (struct timespec __user *) &ts);
687 set_fs(oldfs);
688 return err;
689}
690
691COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
692 struct compat_timespec __user *, tp)
693{
694 long err;
695 mm_segment_t oldfs;
696 struct timespec ts;
697
698 oldfs = get_fs();
699 set_fs(KERNEL_DS);
700 err = sys_clock_gettime(which_clock,
701 (struct timespec __user *) &ts);
702 set_fs(oldfs);
703 if (!err && compat_put_timespec(&ts, tp))
704 return -EFAULT;
705 return err;
706}
707
708COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
709 struct compat_timex __user *, utp)
710{
711 struct timex txc;
712 mm_segment_t oldfs;
713 int err, ret;
714
715 err = compat_get_timex(&txc, utp);
716 if (err)
717 return err;
718
719 oldfs = get_fs();
720 set_fs(KERNEL_DS);
721 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
722 set_fs(oldfs);
723
724 err = compat_put_timex(utp, &txc);
725 if (err)
726 return err;
727
728 return ret;
729}
730
731COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
732 struct compat_timespec __user *, tp)
733{
734 long err;
735 mm_segment_t oldfs;
736 struct timespec ts;
737
738 oldfs = get_fs();
739 set_fs(KERNEL_DS);
740 err = sys_clock_getres(which_clock,
741 (struct timespec __user *) &ts);
742 set_fs(oldfs);
743 if (!err && tp && compat_put_timespec(&ts, tp))
744 return -EFAULT;
745 return err;
746}
747
748/*
749 * We currently only need the following fields from the sigevent
750 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
751 * sigev_notify_thread_id). The others are handled in user mode.
752 * We also assume that copying sigev_value.sival_int is sufficient
753 * to keep all the bits of sigev_value.sival_ptr intact.
754 */
755int get_compat_sigevent(struct sigevent *event,
756 const struct compat_sigevent __user *u_event)
757{
758 memset(event, 0, sizeof(*event));
759 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
760 __get_user(event->sigev_value.sival_int,
761 &u_event->sigev_value.sival_int) ||
762 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
763 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
764 __get_user(event->sigev_notify_thread_id,
765 &u_event->sigev_notify_thread_id))
766 ? -EFAULT : 0;
767}
768
769long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
770 unsigned long bitmap_size)
771{
772 int i, j;
773 unsigned long m;
774 compat_ulong_t um;
775 unsigned long nr_compat_longs;
776
777 /* align bitmap up to nearest compat_long_t boundary */
778 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
779
780 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
781 return -EFAULT;
782
783 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
784
785 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
786 m = 0;
787
788 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
789 /*
790 * We dont want to read past the end of the userspace
791 * bitmap. We must however ensure the end of the
792 * kernel bitmap is zeroed.
793 */
794 if (nr_compat_longs) {
795 nr_compat_longs--;
796 if (__get_user(um, umask))
797 return -EFAULT;
798 } else {
799 um = 0;
800 }
801
802 umask++;
803 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
804 }
805 *mask++ = m;
806 }
807
808 return 0;
809}
810
811long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
812 unsigned long bitmap_size)
813{
814 int i, j;
815 unsigned long m;
816 compat_ulong_t um;
817 unsigned long nr_compat_longs;
818
819 /* align bitmap up to nearest compat_long_t boundary */
820 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
821
822 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
823 return -EFAULT;
824
825 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
826
827 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
828 m = *mask++;
829
830 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
831 um = m;
832
833 /*
834 * We dont want to write past the end of the userspace
835 * bitmap.
836 */
837 if (nr_compat_longs) {
838 nr_compat_longs--;
839 if (__put_user(um, umask))
840 return -EFAULT;
841 }
842
843 umask++;
844 m >>= 4*sizeof(um);
845 m >>= 4*sizeof(um);
846 }
847 }
848
849 return 0;
850}
851
852void
853sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
854{
855 switch (_NSIG_WORDS) {
856 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
857 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
858 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
859 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
860 }
861}
862EXPORT_SYMBOL_GPL(sigset_from_compat);
863
864void
865sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
866{
867 switch (_NSIG_WORDS) {
868 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
869 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
870 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
871 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
872 }
873}
874
875COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
876 struct compat_siginfo __user *, uinfo,
877 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
878{
879 compat_sigset_t s32;
880 sigset_t s;
881 struct timespec t;
882 siginfo_t info;
883 long ret;
884
885 if (sigsetsize != sizeof(sigset_t))
886 return -EINVAL;
887
888 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
889 return -EFAULT;
890 sigset_from_compat(&s, &s32);
891
892 if (uts) {
893 if (compat_get_timespec(&t, uts))
894 return -EFAULT;
895 }
896
897 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
898
899 if (ret > 0 && uinfo) {
900 if (copy_siginfo_to_user32(uinfo, &info))
901 ret = -EFAULT;
902 }
903
904 return ret;
905}
906
907#ifdef __ARCH_WANT_COMPAT_SYS_TIME
908
909/* compat_time_t is a 32 bit "long" and needs to get converted. */
910
911COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
912{
913 compat_time_t i;
914 struct timeval tv;
915
916 do_gettimeofday(&tv);
917 i = tv.tv_sec;
918
919 if (tloc) {
920 if (put_user(i,tloc))
921 return -EFAULT;
922 }
923 force_successful_syscall_return();
924 return i;
925}
926
927COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
928{
929 struct timespec tv;
930 int err;
931
932 if (get_user(tv.tv_sec, tptr))
933 return -EFAULT;
934
935 tv.tv_nsec = 0;
936
937 err = security_settime(&tv, NULL);
938 if (err)
939 return err;
940
941 do_settimeofday(&tv);
942 return 0;
943}
944
945#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
946
947COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
948{
949 struct timex txc;
950 int err, ret;
951
952 err = compat_get_timex(&txc, utp);
953 if (err)
954 return err;
955
956 ret = do_adjtimex(&txc);
957
958 err = compat_put_timex(utp, &txc);
959 if (err)
960 return err;
961
962 return ret;
963}
964
965#ifdef CONFIG_NUMA
966COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, 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
986COMPAT_SYSCALL_DEFINE4(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
1020COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1021 compat_pid_t, pid,
1022 struct compat_timespec __user *, interval)
1023{
1024 struct timespec t;
1025 int ret;
1026 mm_segment_t old_fs = get_fs();
1027
1028 set_fs(KERNEL_DS);
1029 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1030 set_fs(old_fs);
1031 if (compat_put_timespec(&t, interval))
1032 return -EFAULT;
1033 return ret;
1034}
1035
1036/*
1037 * Allocate user-space memory for the duration of a single system call,
1038 * in order to marshall parameters inside a compat thunk.
1039 */
1040void __user *compat_alloc_user_space(unsigned long len)
1041{
1042 void __user *ptr;
1043
1044 /* If len would occupy more than half of the entire compat space... */
1045 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1046 return NULL;
1047
1048 ptr = arch_compat_alloc_user_space(len);
1049
1050 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1051 return NULL;
1052
1053 return ptr;
1054}
1055EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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