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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 <asm/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 timeval user_tv;
112 struct timespec new_ts;
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_settimeofday(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 long compat_nanosleep_restart(struct restart_block *restart)
217{
218 struct compat_timespec __user *rmtp;
219 struct timespec rmt;
220 mm_segment_t oldfs;
221 long ret;
222
223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
224 oldfs = get_fs();
225 set_fs(KERNEL_DS);
226 ret = hrtimer_nanosleep_restart(restart);
227 set_fs(oldfs);
228
229 if (ret) {
230 rmtp = restart->nanosleep.compat_rmtp;
231
232 if (rmtp && compat_put_timespec(&rmt, rmtp))
233 return -EFAULT;
234 }
235
236 return ret;
237}
238
239COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240 struct compat_timespec __user *, rmtp)
241{
242 struct timespec tu, rmt;
243 mm_segment_t oldfs;
244 long ret;
245
246 if (compat_get_timespec(&tu, rqtp))
247 return -EFAULT;
248
249 if (!timespec_valid(&tu))
250 return -EINVAL;
251
252 oldfs = get_fs();
253 set_fs(KERNEL_DS);
254 ret = hrtimer_nanosleep(&tu,
255 rmtp ? (struct timespec __user *)&rmt : NULL,
256 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
257 set_fs(oldfs);
258
259 if (ret) {
260 struct restart_block *restart
261 = ¤t_thread_info()->restart_block;
262
263 restart->fn = compat_nanosleep_restart;
264 restart->nanosleep.compat_rmtp = rmtp;
265
266 if (rmtp && compat_put_timespec(&rmt, rmtp))
267 return -EFAULT;
268 }
269
270 return ret;
271}
272
273static inline long get_compat_itimerval(struct itimerval *o,
274 struct compat_itimerval __user *i)
275{
276 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
277 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
278 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
279 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
280 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
281}
282
283static inline long put_compat_itimerval(struct compat_itimerval __user *o,
284 struct itimerval *i)
285{
286 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
287 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
288 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
289 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
290 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
291}
292
293COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
294 struct compat_itimerval __user *, it)
295{
296 struct itimerval kit;
297 int error;
298
299 error = do_getitimer(which, &kit);
300 if (!error && put_compat_itimerval(it, &kit))
301 error = -EFAULT;
302 return error;
303}
304
305COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
306 struct compat_itimerval __user *, in,
307 struct compat_itimerval __user *, out)
308{
309 struct itimerval kin, kout;
310 int error;
311
312 if (in) {
313 if (get_compat_itimerval(&kin, in))
314 return -EFAULT;
315 } else
316 memset(&kin, 0, sizeof(kin));
317
318 error = do_setitimer(which, &kin, out ? &kout : NULL);
319 if (error || !out)
320 return error;
321 if (put_compat_itimerval(out, &kout))
322 return -EFAULT;
323 return 0;
324}
325
326static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
327{
328 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
329}
330
331COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
332{
333 if (tbuf) {
334 struct tms tms;
335 struct compat_tms tmp;
336
337 do_sys_times(&tms);
338 /* Convert our struct tms to the compat version. */
339 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
340 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
341 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
342 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
343 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
344 return -EFAULT;
345 }
346 force_successful_syscall_return();
347 return compat_jiffies_to_clock_t(jiffies);
348}
349
350#ifdef __ARCH_WANT_SYS_SIGPENDING
351
352/*
353 * Assumption: old_sigset_t and compat_old_sigset_t are both
354 * types that can be passed to put_user()/get_user().
355 */
356
357COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
358{
359 old_sigset_t s;
360 long ret;
361 mm_segment_t old_fs = get_fs();
362
363 set_fs(KERNEL_DS);
364 ret = sys_sigpending((old_sigset_t __user *) &s);
365 set_fs(old_fs);
366 if (ret == 0)
367 ret = put_user(s, set);
368 return ret;
369}
370
371#endif
372
373#ifdef __ARCH_WANT_SYS_SIGPROCMASK
374
375/*
376 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
377 * blocked set of signals to the supplied signal set
378 */
379static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
380{
381 memcpy(blocked->sig, &set, sizeof(set));
382}
383
384COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
385 compat_old_sigset_t __user *, nset,
386 compat_old_sigset_t __user *, oset)
387{
388 old_sigset_t old_set, new_set;
389 sigset_t new_blocked;
390
391 old_set = current->blocked.sig[0];
392
393 if (nset) {
394 if (get_user(new_set, nset))
395 return -EFAULT;
396 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
397
398 new_blocked = current->blocked;
399
400 switch (how) {
401 case SIG_BLOCK:
402 sigaddsetmask(&new_blocked, new_set);
403 break;
404 case SIG_UNBLOCK:
405 sigdelsetmask(&new_blocked, new_set);
406 break;
407 case SIG_SETMASK:
408 compat_sig_setmask(&new_blocked, new_set);
409 break;
410 default:
411 return -EINVAL;
412 }
413
414 set_current_blocked(&new_blocked);
415 }
416
417 if (oset) {
418 if (put_user(old_set, oset))
419 return -EFAULT;
420 }
421
422 return 0;
423}
424
425#endif
426
427COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
428 struct compat_rlimit __user *, rlim)
429{
430 struct rlimit r;
431
432 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
433 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
434 __get_user(r.rlim_max, &rlim->rlim_max))
435 return -EFAULT;
436
437 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
438 r.rlim_cur = RLIM_INFINITY;
439 if (r.rlim_max == COMPAT_RLIM_INFINITY)
440 r.rlim_max = RLIM_INFINITY;
441 return do_prlimit(current, resource, &r, NULL);
442}
443
444#ifdef COMPAT_RLIM_OLD_INFINITY
445
446COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
447 struct compat_rlimit __user *, rlim)
448{
449 struct rlimit r;
450 int ret;
451 mm_segment_t old_fs = get_fs();
452
453 set_fs(KERNEL_DS);
454 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
455 set_fs(old_fs);
456
457 if (!ret) {
458 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
459 r.rlim_cur = COMPAT_RLIM_INFINITY;
460 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
461 r.rlim_max = COMPAT_RLIM_INFINITY;
462
463 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
464 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
465 __put_user(r.rlim_max, &rlim->rlim_max))
466 return -EFAULT;
467 }
468 return ret;
469}
470
471#endif
472
473COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
474 struct compat_rlimit __user *, rlim)
475{
476 struct rlimit r;
477 int ret;
478
479 ret = do_prlimit(current, resource, NULL, &r);
480 if (!ret) {
481 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
482 r.rlim_cur = COMPAT_RLIM_INFINITY;
483 if (r.rlim_max > COMPAT_RLIM_INFINITY)
484 r.rlim_max = COMPAT_RLIM_INFINITY;
485
486 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
487 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
488 __put_user(r.rlim_max, &rlim->rlim_max))
489 return -EFAULT;
490 }
491 return ret;
492}
493
494int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
495{
496 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
497 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
498 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
499 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
500 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
501 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
502 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
503 __put_user(r->ru_idrss, &ru->ru_idrss) ||
504 __put_user(r->ru_isrss, &ru->ru_isrss) ||
505 __put_user(r->ru_minflt, &ru->ru_minflt) ||
506 __put_user(r->ru_majflt, &ru->ru_majflt) ||
507 __put_user(r->ru_nswap, &ru->ru_nswap) ||
508 __put_user(r->ru_inblock, &ru->ru_inblock) ||
509 __put_user(r->ru_oublock, &ru->ru_oublock) ||
510 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
511 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
512 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
513 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
514 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
515 return -EFAULT;
516 return 0;
517}
518
519COMPAT_SYSCALL_DEFINE4(wait4,
520 compat_pid_t, pid,
521 compat_uint_t __user *, stat_addr,
522 int, options,
523 struct compat_rusage __user *, ru)
524{
525 if (!ru) {
526 return sys_wait4(pid, stat_addr, options, NULL);
527 } else {
528 struct rusage r;
529 int ret;
530 unsigned int status;
531 mm_segment_t old_fs = get_fs();
532
533 set_fs (KERNEL_DS);
534 ret = sys_wait4(pid,
535 (stat_addr ?
536 (unsigned int __user *) &status : NULL),
537 options, (struct rusage __user *) &r);
538 set_fs (old_fs);
539
540 if (ret > 0) {
541 if (put_compat_rusage(&r, ru))
542 return -EFAULT;
543 if (stat_addr && put_user(status, stat_addr))
544 return -EFAULT;
545 }
546 return ret;
547 }
548}
549
550COMPAT_SYSCALL_DEFINE5(waitid,
551 int, which, compat_pid_t, pid,
552 struct compat_siginfo __user *, uinfo, int, options,
553 struct compat_rusage __user *, uru)
554{
555 siginfo_t info;
556 struct rusage ru;
557 long ret;
558 mm_segment_t old_fs = get_fs();
559
560 memset(&info, 0, sizeof(info));
561
562 set_fs(KERNEL_DS);
563 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
564 uru ? (struct rusage __user *)&ru : NULL);
565 set_fs(old_fs);
566
567 if ((ret < 0) || (info.si_signo == 0))
568 return ret;
569
570 if (uru) {
571 /* sys_waitid() overwrites everything in ru */
572 if (COMPAT_USE_64BIT_TIME)
573 ret = copy_to_user(uru, &ru, sizeof(ru));
574 else
575 ret = put_compat_rusage(&ru, uru);
576 if (ret)
577 return -EFAULT;
578 }
579
580 BUG_ON(info.si_code & __SI_MASK);
581 info.si_code |= __SI_CHLD;
582 return copy_siginfo_to_user32(uinfo, &info);
583}
584
585static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
586 unsigned len, struct cpumask *new_mask)
587{
588 unsigned long *k;
589
590 if (len < cpumask_size())
591 memset(new_mask, 0, cpumask_size());
592 else if (len > cpumask_size())
593 len = cpumask_size();
594
595 k = cpumask_bits(new_mask);
596 return compat_get_bitmap(k, user_mask_ptr, len * 8);
597}
598
599COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
600 unsigned int, len,
601 compat_ulong_t __user *, user_mask_ptr)
602{
603 cpumask_var_t new_mask;
604 int retval;
605
606 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
607 return -ENOMEM;
608
609 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
610 if (retval)
611 goto out;
612
613 retval = sched_setaffinity(pid, new_mask);
614out:
615 free_cpumask_var(new_mask);
616 return retval;
617}
618
619COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
620 compat_ulong_t __user *, user_mask_ptr)
621{
622 int ret;
623 cpumask_var_t mask;
624
625 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
626 return -EINVAL;
627 if (len & (sizeof(compat_ulong_t)-1))
628 return -EINVAL;
629
630 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
631 return -ENOMEM;
632
633 ret = sched_getaffinity(pid, mask);
634 if (ret == 0) {
635 size_t retlen = min_t(size_t, len, cpumask_size());
636
637 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
638 ret = -EFAULT;
639 else
640 ret = retlen;
641 }
642 free_cpumask_var(mask);
643
644 return ret;
645}
646
647int get_compat_itimerspec(struct itimerspec *dst,
648 const struct compat_itimerspec __user *src)
649{
650 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
651 __compat_get_timespec(&dst->it_value, &src->it_value))
652 return -EFAULT;
653 return 0;
654}
655
656int put_compat_itimerspec(struct compat_itimerspec __user *dst,
657 const struct itimerspec *src)
658{
659 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
660 __compat_put_timespec(&src->it_value, &dst->it_value))
661 return -EFAULT;
662 return 0;
663}
664
665COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
666 struct compat_sigevent __user *, timer_event_spec,
667 timer_t __user *, created_timer_id)
668{
669 struct sigevent __user *event = NULL;
670
671 if (timer_event_spec) {
672 struct sigevent kevent;
673
674 event = compat_alloc_user_space(sizeof(*event));
675 if (get_compat_sigevent(&kevent, timer_event_spec) ||
676 copy_to_user(event, &kevent, sizeof(*event)))
677 return -EFAULT;
678 }
679
680 return sys_timer_create(which_clock, event, created_timer_id);
681}
682
683COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
684 struct compat_itimerspec __user *, new,
685 struct compat_itimerspec __user *, old)
686{
687 long err;
688 mm_segment_t oldfs;
689 struct itimerspec newts, oldts;
690
691 if (!new)
692 return -EINVAL;
693 if (get_compat_itimerspec(&newts, new))
694 return -EFAULT;
695 oldfs = get_fs();
696 set_fs(KERNEL_DS);
697 err = sys_timer_settime(timer_id, flags,
698 (struct itimerspec __user *) &newts,
699 (struct itimerspec __user *) &oldts);
700 set_fs(oldfs);
701 if (!err && old && put_compat_itimerspec(old, &oldts))
702 return -EFAULT;
703 return err;
704}
705
706COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
707 struct compat_itimerspec __user *, setting)
708{
709 long err;
710 mm_segment_t oldfs;
711 struct itimerspec ts;
712
713 oldfs = get_fs();
714 set_fs(KERNEL_DS);
715 err = sys_timer_gettime(timer_id,
716 (struct itimerspec __user *) &ts);
717 set_fs(oldfs);
718 if (!err && put_compat_itimerspec(setting, &ts))
719 return -EFAULT;
720 return err;
721}
722
723COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
724 struct compat_timespec __user *, tp)
725{
726 long err;
727 mm_segment_t oldfs;
728 struct timespec ts;
729
730 if (compat_get_timespec(&ts, tp))
731 return -EFAULT;
732 oldfs = get_fs();
733 set_fs(KERNEL_DS);
734 err = sys_clock_settime(which_clock,
735 (struct timespec __user *) &ts);
736 set_fs(oldfs);
737 return err;
738}
739
740COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
741 struct compat_timespec __user *, tp)
742{
743 long err;
744 mm_segment_t oldfs;
745 struct timespec ts;
746
747 oldfs = get_fs();
748 set_fs(KERNEL_DS);
749 err = sys_clock_gettime(which_clock,
750 (struct timespec __user *) &ts);
751 set_fs(oldfs);
752 if (!err && compat_put_timespec(&ts, tp))
753 return -EFAULT;
754 return err;
755}
756
757COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
758 struct compat_timex __user *, utp)
759{
760 struct timex txc;
761 mm_segment_t oldfs;
762 int err, ret;
763
764 err = compat_get_timex(&txc, utp);
765 if (err)
766 return err;
767
768 oldfs = get_fs();
769 set_fs(KERNEL_DS);
770 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
771 set_fs(oldfs);
772
773 err = compat_put_timex(utp, &txc);
774 if (err)
775 return err;
776
777 return ret;
778}
779
780COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
781 struct compat_timespec __user *, tp)
782{
783 long err;
784 mm_segment_t oldfs;
785 struct timespec ts;
786
787 oldfs = get_fs();
788 set_fs(KERNEL_DS);
789 err = sys_clock_getres(which_clock,
790 (struct timespec __user *) &ts);
791 set_fs(oldfs);
792 if (!err && tp && compat_put_timespec(&ts, tp))
793 return -EFAULT;
794 return err;
795}
796
797static long compat_clock_nanosleep_restart(struct restart_block *restart)
798{
799 long err;
800 mm_segment_t oldfs;
801 struct timespec tu;
802 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
803
804 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
805 oldfs = get_fs();
806 set_fs(KERNEL_DS);
807 err = clock_nanosleep_restart(restart);
808 set_fs(oldfs);
809
810 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
811 compat_put_timespec(&tu, rmtp))
812 return -EFAULT;
813
814 if (err == -ERESTART_RESTARTBLOCK) {
815 restart->fn = compat_clock_nanosleep_restart;
816 restart->nanosleep.compat_rmtp = rmtp;
817 }
818 return err;
819}
820
821COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
822 struct compat_timespec __user *, rqtp,
823 struct compat_timespec __user *, rmtp)
824{
825 long err;
826 mm_segment_t oldfs;
827 struct timespec in, out;
828 struct restart_block *restart;
829
830 if (compat_get_timespec(&in, rqtp))
831 return -EFAULT;
832
833 oldfs = get_fs();
834 set_fs(KERNEL_DS);
835 err = sys_clock_nanosleep(which_clock, flags,
836 (struct timespec __user *) &in,
837 (struct timespec __user *) &out);
838 set_fs(oldfs);
839
840 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
841 compat_put_timespec(&out, rmtp))
842 return -EFAULT;
843
844 if (err == -ERESTART_RESTARTBLOCK) {
845 restart = ¤t_thread_info()->restart_block;
846 restart->fn = compat_clock_nanosleep_restart;
847 restart->nanosleep.compat_rmtp = rmtp;
848 }
849 return err;
850}
851
852/*
853 * We currently only need the following fields from the sigevent
854 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
855 * sigev_notify_thread_id). The others are handled in user mode.
856 * We also assume that copying sigev_value.sival_int is sufficient
857 * to keep all the bits of sigev_value.sival_ptr intact.
858 */
859int get_compat_sigevent(struct sigevent *event,
860 const struct compat_sigevent __user *u_event)
861{
862 memset(event, 0, sizeof(*event));
863 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
864 __get_user(event->sigev_value.sival_int,
865 &u_event->sigev_value.sival_int) ||
866 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
867 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
868 __get_user(event->sigev_notify_thread_id,
869 &u_event->sigev_notify_thread_id))
870 ? -EFAULT : 0;
871}
872
873long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
874 unsigned long bitmap_size)
875{
876 int i, j;
877 unsigned long m;
878 compat_ulong_t um;
879 unsigned long nr_compat_longs;
880
881 /* align bitmap up to nearest compat_long_t boundary */
882 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
883
884 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
885 return -EFAULT;
886
887 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
888
889 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
890 m = 0;
891
892 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
893 /*
894 * We dont want to read past the end of the userspace
895 * bitmap. We must however ensure the end of the
896 * kernel bitmap is zeroed.
897 */
898 if (nr_compat_longs-- > 0) {
899 if (__get_user(um, umask))
900 return -EFAULT;
901 } else {
902 um = 0;
903 }
904
905 umask++;
906 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
907 }
908 *mask++ = m;
909 }
910
911 return 0;
912}
913
914long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
915 unsigned long bitmap_size)
916{
917 int i, j;
918 unsigned long m;
919 compat_ulong_t um;
920 unsigned long nr_compat_longs;
921
922 /* align bitmap up to nearest compat_long_t boundary */
923 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
924
925 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
926 return -EFAULT;
927
928 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
929
930 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
931 m = *mask++;
932
933 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
934 um = m;
935
936 /*
937 * We dont want to write past the end of the userspace
938 * bitmap.
939 */
940 if (nr_compat_longs-- > 0) {
941 if (__put_user(um, umask))
942 return -EFAULT;
943 }
944
945 umask++;
946 m >>= 4*sizeof(um);
947 m >>= 4*sizeof(um);
948 }
949 }
950
951 return 0;
952}
953
954void
955sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
956{
957 switch (_NSIG_WORDS) {
958 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
959 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
960 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
961 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
962 }
963}
964EXPORT_SYMBOL_GPL(sigset_from_compat);
965
966void
967sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
968{
969 switch (_NSIG_WORDS) {
970 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
971 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
972 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
973 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
974 }
975}
976
977COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
978 struct compat_siginfo __user *, uinfo,
979 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
980{
981 compat_sigset_t s32;
982 sigset_t s;
983 struct timespec t;
984 siginfo_t info;
985 long ret;
986
987 if (sigsetsize != sizeof(sigset_t))
988 return -EINVAL;
989
990 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
991 return -EFAULT;
992 sigset_from_compat(&s, &s32);
993
994 if (uts) {
995 if (compat_get_timespec(&t, uts))
996 return -EFAULT;
997 }
998
999 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1000
1001 if (ret > 0 && uinfo) {
1002 if (copy_siginfo_to_user32(uinfo, &info))
1003 ret = -EFAULT;
1004 }
1005
1006 return ret;
1007}
1008
1009#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1010
1011/* compat_time_t is a 32 bit "long" and needs to get converted. */
1012
1013COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1014{
1015 compat_time_t i;
1016 struct timeval tv;
1017
1018 do_gettimeofday(&tv);
1019 i = tv.tv_sec;
1020
1021 if (tloc) {
1022 if (put_user(i,tloc))
1023 return -EFAULT;
1024 }
1025 force_successful_syscall_return();
1026 return i;
1027}
1028
1029COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1030{
1031 struct timespec tv;
1032 int err;
1033
1034 if (get_user(tv.tv_sec, tptr))
1035 return -EFAULT;
1036
1037 tv.tv_nsec = 0;
1038
1039 err = security_settime(&tv, NULL);
1040 if (err)
1041 return err;
1042
1043 do_settimeofday(&tv);
1044 return 0;
1045}
1046
1047#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1048
1049COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1050{
1051 struct timex txc;
1052 int err, ret;
1053
1054 err = compat_get_timex(&txc, utp);
1055 if (err)
1056 return err;
1057
1058 ret = do_adjtimex(&txc);
1059
1060 err = compat_put_timex(utp, &txc);
1061 if (err)
1062 return err;
1063
1064 return ret;
1065}
1066
1067#ifdef CONFIG_NUMA
1068COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1069 compat_uptr_t __user *, pages32,
1070 const int __user *, nodes,
1071 int __user *, status,
1072 int, flags)
1073{
1074 const void __user * __user *pages;
1075 int i;
1076
1077 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1078 for (i = 0; i < nr_pages; i++) {
1079 compat_uptr_t p;
1080
1081 if (get_user(p, pages32 + i) ||
1082 put_user(compat_ptr(p), pages + i))
1083 return -EFAULT;
1084 }
1085 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1086}
1087
1088COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1089 compat_ulong_t, maxnode,
1090 const compat_ulong_t __user *, old_nodes,
1091 const compat_ulong_t __user *, new_nodes)
1092{
1093 unsigned long __user *old = NULL;
1094 unsigned long __user *new = NULL;
1095 nodemask_t tmp_mask;
1096 unsigned long nr_bits;
1097 unsigned long size;
1098
1099 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1100 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1101 if (old_nodes) {
1102 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1103 return -EFAULT;
1104 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1105 if (new_nodes)
1106 new = old + size / sizeof(unsigned long);
1107 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1108 return -EFAULT;
1109 }
1110 if (new_nodes) {
1111 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1112 return -EFAULT;
1113 if (new == NULL)
1114 new = compat_alloc_user_space(size);
1115 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1116 return -EFAULT;
1117 }
1118 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1119}
1120#endif
1121
1122COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1123 compat_pid_t, pid,
1124 struct compat_timespec __user *, interval)
1125{
1126 struct timespec t;
1127 int ret;
1128 mm_segment_t old_fs = get_fs();
1129
1130 set_fs(KERNEL_DS);
1131 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1132 set_fs(old_fs);
1133 if (compat_put_timespec(&t, interval))
1134 return -EFAULT;
1135 return ret;
1136}
1137
1138/*
1139 * Allocate user-space memory for the duration of a single system call,
1140 * in order to marshall parameters inside a compat thunk.
1141 */
1142void __user *compat_alloc_user_space(unsigned long len)
1143{
1144 void __user *ptr;
1145
1146 /* If len would occupy more than half of the entire compat space... */
1147 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1148 return NULL;
1149
1150 ptr = arch_compat_alloc_user_space(len);
1151
1152 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1153 return NULL;
1154
1155 return ptr;
1156}
1157EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/kernel/compat.c
4 *
5 * Kernel compatibililty routines for e.g. 32 bit syscall support
6 * on 64 bit kernels.
7 *
8 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
9 */
10
11#include <linux/linkage.h>
12#include <linux/compat.h>
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/signal.h>
16#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
17#include <linux/syscalls.h>
18#include <linux/unistd.h>
19#include <linux/security.h>
20#include <linux/export.h>
21#include <linux/migrate.h>
22#include <linux/posix-timers.h>
23#include <linux/times.h>
24#include <linux/ptrace.h>
25#include <linux/gfp.h>
26
27#include <linux/uaccess.h>
28
29#ifdef __ARCH_WANT_SYS_SIGPROCMASK
30
31/*
32 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
33 * blocked set of signals to the supplied signal set
34 */
35static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
36{
37 memcpy(blocked->sig, &set, sizeof(set));
38}
39
40COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
41 compat_old_sigset_t __user *, nset,
42 compat_old_sigset_t __user *, oset)
43{
44 old_sigset_t old_set, new_set;
45 sigset_t new_blocked;
46
47 old_set = current->blocked.sig[0];
48
49 if (nset) {
50 if (get_user(new_set, nset))
51 return -EFAULT;
52 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
53
54 new_blocked = current->blocked;
55
56 switch (how) {
57 case SIG_BLOCK:
58 sigaddsetmask(&new_blocked, new_set);
59 break;
60 case SIG_UNBLOCK:
61 sigdelsetmask(&new_blocked, new_set);
62 break;
63 case SIG_SETMASK:
64 compat_sig_setmask(&new_blocked, new_set);
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 set_current_blocked(&new_blocked);
71 }
72
73 if (oset) {
74 if (put_user(old_set, oset))
75 return -EFAULT;
76 }
77
78 return 0;
79}
80
81#endif
82
83int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
84{
85 struct compat_rusage r32;
86 memset(&r32, 0, sizeof(r32));
87 r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
88 r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
89 r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
90 r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
91 r32.ru_maxrss = r->ru_maxrss;
92 r32.ru_ixrss = r->ru_ixrss;
93 r32.ru_idrss = r->ru_idrss;
94 r32.ru_isrss = r->ru_isrss;
95 r32.ru_minflt = r->ru_minflt;
96 r32.ru_majflt = r->ru_majflt;
97 r32.ru_nswap = r->ru_nswap;
98 r32.ru_inblock = r->ru_inblock;
99 r32.ru_oublock = r->ru_oublock;
100 r32.ru_msgsnd = r->ru_msgsnd;
101 r32.ru_msgrcv = r->ru_msgrcv;
102 r32.ru_nsignals = r->ru_nsignals;
103 r32.ru_nvcsw = r->ru_nvcsw;
104 r32.ru_nivcsw = r->ru_nivcsw;
105 if (copy_to_user(ru, &r32, sizeof(r32)))
106 return -EFAULT;
107 return 0;
108}
109
110static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
111 unsigned len, struct cpumask *new_mask)
112{
113 unsigned long *k;
114
115 if (len < cpumask_size())
116 memset(new_mask, 0, cpumask_size());
117 else if (len > cpumask_size())
118 len = cpumask_size();
119
120 k = cpumask_bits(new_mask);
121 return compat_get_bitmap(k, user_mask_ptr, len * 8);
122}
123
124COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
125 unsigned int, len,
126 compat_ulong_t __user *, user_mask_ptr)
127{
128 cpumask_var_t new_mask;
129 int retval;
130
131 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
132 return -ENOMEM;
133
134 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
135 if (retval)
136 goto out;
137
138 retval = sched_setaffinity(pid, new_mask);
139out:
140 free_cpumask_var(new_mask);
141 return retval;
142}
143
144COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
145 compat_ulong_t __user *, user_mask_ptr)
146{
147 int ret;
148 cpumask_var_t mask;
149
150 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
151 return -EINVAL;
152 if (len & (sizeof(compat_ulong_t)-1))
153 return -EINVAL;
154
155 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
156 return -ENOMEM;
157
158 ret = sched_getaffinity(pid, mask);
159 if (ret == 0) {
160 unsigned int retlen = min(len, cpumask_size());
161
162 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
163 ret = -EFAULT;
164 else
165 ret = retlen;
166 }
167 free_cpumask_var(mask);
168
169 return ret;
170}
171
172/*
173 * We currently only need the following fields from the sigevent
174 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
175 * sigev_notify_thread_id). The others are handled in user mode.
176 * We also assume that copying sigev_value.sival_int is sufficient
177 * to keep all the bits of sigev_value.sival_ptr intact.
178 */
179int get_compat_sigevent(struct sigevent *event,
180 const struct compat_sigevent __user *u_event)
181{
182 memset(event, 0, sizeof(*event));
183 return (!access_ok(u_event, sizeof(*u_event)) ||
184 __get_user(event->sigev_value.sival_int,
185 &u_event->sigev_value.sival_int) ||
186 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
187 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
188 __get_user(event->sigev_notify_thread_id,
189 &u_event->sigev_notify_thread_id))
190 ? -EFAULT : 0;
191}
192
193long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
194 unsigned long bitmap_size)
195{
196 unsigned long nr_compat_longs;
197
198 /* align bitmap up to nearest compat_long_t boundary */
199 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
200 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
201
202 if (!user_read_access_begin(umask, bitmap_size / 8))
203 return -EFAULT;
204
205 while (nr_compat_longs > 1) {
206 compat_ulong_t l1, l2;
207 unsafe_get_user(l1, umask++, Efault);
208 unsafe_get_user(l2, umask++, Efault);
209 *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
210 nr_compat_longs -= 2;
211 }
212 if (nr_compat_longs)
213 unsafe_get_user(*mask, umask++, Efault);
214 user_read_access_end();
215 return 0;
216
217Efault:
218 user_read_access_end();
219 return -EFAULT;
220}
221
222long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
223 unsigned long bitmap_size)
224{
225 unsigned long nr_compat_longs;
226
227 /* align bitmap up to nearest compat_long_t boundary */
228 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
229 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
230
231 if (!user_write_access_begin(umask, bitmap_size / 8))
232 return -EFAULT;
233
234 while (nr_compat_longs > 1) {
235 unsigned long m = *mask++;
236 unsafe_put_user((compat_ulong_t)m, umask++, Efault);
237 unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
238 nr_compat_longs -= 2;
239 }
240 if (nr_compat_longs)
241 unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
242 user_write_access_end();
243 return 0;
244Efault:
245 user_write_access_end();
246 return -EFAULT;
247}
248
249int
250get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
251{
252#ifdef __BIG_ENDIAN
253 compat_sigset_t v;
254 if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
255 return -EFAULT;
256 switch (_NSIG_WORDS) {
257 case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
258 fallthrough;
259 case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
260 fallthrough;
261 case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
262 fallthrough;
263 case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
264 }
265#else
266 if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
267 return -EFAULT;
268#endif
269 return 0;
270}
271EXPORT_SYMBOL_GPL(get_compat_sigset);