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Merge tag 'iio-fixes-for-4.11c' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / kernel / compat.c
CommitLineData
1da177e4
LT		 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 */
1da177e4
LT		 20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
3158e941 23#include <linux/timex.h>
6e5fdeed 24#include <linux/export.h>
1b2db9fb 25#include <linux/migrate.h>
1711ef38 26#include <linux/posix-timers.h>
f06febc9 27#include <linux/times.h>
e3d5a27d 28#include <linux/ptrace.h>
5a0e3ad6 29#include <linux/gfp.h>
1da177e4 30
7c0f6ba6 31#include <linux/uaccess.h>
1da177e4 32
65f5d80b
RC		 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
62a6fa97
HC		 91COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
92 struct timezone __user *, tz)
b418da16
CH		 93{
94 if (tv) {
95 struct timeval ktv;
96 do_gettimeofday(&ktv);
81993e81 97 if (compat_put_timeval(&ktv, tv))
b418da16
CH		 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
62a6fa97
HC		 108COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109 struct timezone __user *, tz)
b418da16 110{
81993e81
PA		 111 struct timeval user_tv;
112 struct timespec new_ts;
113 struct timezone new_tz;
b418da16
CH		 114
115 if (tv) {
81993e81 116 if (compat_get_timeval(&user_tv, tv))
b418da16 117 return -EFAULT;
81993e81
PA		 118 new_ts.tv_sec = user_tv.tv_sec;
119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
b418da16
CH		 120 }
121 if (tz) {
81993e81 122 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
b418da16
CH		 123 return -EFAULT;
124 }
125
81993e81 126 return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
b418da16
CH		 127}
128
81993e81 129static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
6684ba20
PA		 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}
6684ba20 135
81993e81 136static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
6684ba20
PA		 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}
6684ba20 142
81993e81 143static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
1da177e4
LT		 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
81993e81 150static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
1da177e4
LT		 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
6684ba20
PA		 157int compat_get_timeval(struct timeval *tv, const void __user *utv)
158{
159 if (COMPAT_USE_64BIT_TIME)
6516a466 160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20 161 else
81993e81 162 return __compat_get_timeval(tv, utv);
6684ba20
PA		 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)
6516a466 169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20 170 else
81993e81 171 return __compat_put_timeval(tv, utv);
6684ba20
PA		 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)
6516a466 178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20 179 else
81993e81 180 return __compat_get_timespec(ts, uts);
6684ba20
PA		 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)
6516a466 187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20 188 else
81993e81 189 return __compat_put_timespec(ts, uts);
6684ba20
PA		 190}
191EXPORT_SYMBOL_GPL(compat_put_timespec);
192
81993e81
PA		 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
41652937
ON		 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
029a07e0 223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 224 oldfs = get_fs();
225 set_fs(KERNEL_DS);
226 ret = hrtimer_nanosleep_restart(restart);
227 set_fs(oldfs);
228
849151dd 229 if (ret == -ERESTART_RESTARTBLOCK) {
029a07e0 230 rmtp = restart->nanosleep.compat_rmtp;
41652937 231
81993e81 232 if (rmtp && compat_put_timespec(&rmt, rmtp))
41652937
ON		 233 return -EFAULT;
234 }
235
236 return ret;
237}
238
62a6fa97
HC		 239COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240 struct compat_timespec __user *, rmtp)
1da177e4 241{
c70878b4 242 struct timespec tu, rmt;
41652937 243 mm_segment_t oldfs;
c70878b4 244 long ret;
1da177e4 245
81993e81 246 if (compat_get_timespec(&tu, rqtp))
1da177e4
LT		 247 return -EFAULT;
248
c70878b4 249 if (!timespec_valid(&tu))
1da177e4
LT		 250 return -EINVAL;
251
41652937
ON		 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
849151dd
TG		 259 /*
260 * hrtimer_nanosleep() can only return 0 or
261 * -ERESTART_RESTARTBLOCK here because:
262 *
263 * - we call it with HRTIMER_MODE_REL and therefor exclude the
264 * -ERESTARTNOHAND return path.
265 *
266 * - we supply the rmtp argument from the task stack (due to
267 * the necessary compat conversion. So the update cannot
268 * fail, which excludes the -EFAULT return path as well. If
269 * it fails nevertheless we have a bigger problem and wont
270 * reach this place anymore.
271 *
272 * - if the return value is 0, we do not have to update rmtp
273 * because there is no remaining time.
274 *
275 * We check for -ERESTART_RESTARTBLOCK nevertheless if the
276 * core implementation decides to return random nonsense.
277 */
278 if (ret == -ERESTART_RESTARTBLOCK) {
f56141e3 279 struct restart_block *restart = &current->restart_block;
41652937
ON		 280
281 restart->fn = compat_nanosleep_restart;
029a07e0 282 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 283
81993e81 284 if (rmtp && compat_put_timespec(&rmt, rmtp))
1da177e4
LT		 285 return -EFAULT;
286 }
c70878b4 287 return ret;
1da177e4
LT		 288}
289
290static inline long get_compat_itimerval(struct itimerval *o,
291 struct compat_itimerval __user *i)
292{
293 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
294 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
295 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
296 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
297 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
298}
299
300static inline long put_compat_itimerval(struct compat_itimerval __user *o,
301 struct itimerval *i)
302{
303 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
304 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
305 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
306 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
307 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
308}
309
baa73d9e
NP		 310asmlinkage long sys_ni_posix_timers(void);
311
37784074
AV		 312COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
313 struct compat_itimerval __user *, it)
1da177e4
LT		 314{
315 struct itimerval kit;
316 int error;
317
baa73d9e
NP		 318 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
319 return sys_ni_posix_timers();
320
1da177e4
LT		 321 error = do_getitimer(which, &kit);
322 if (!error && put_compat_itimerval(it, &kit))
323 error = -EFAULT;
324 return error;
325}
326
37784074
AV		 327COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
328 struct compat_itimerval __user *, in,
329 struct compat_itimerval __user *, out)
1da177e4
LT		 330{
331 struct itimerval kin, kout;
332 int error;
333
baa73d9e
NP		 334 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
335 return sys_ni_posix_timers();
336
1da177e4
LT		 337 if (in) {
338 if (get_compat_itimerval(&kin, in))
339 return -EFAULT;
340 } else
341 memset(&kin, 0, sizeof(kin));
342
343 error = do_setitimer(which, &kin, out ? &kout : NULL);
344 if (error || !out)
345 return error;
346 if (put_compat_itimerval(out, &kout))
347 return -EFAULT;
348 return 0;
349}
350
f06febc9
FM		 351static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
352{
353 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
354}
355
62a6fa97 356COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
1da177e4 357{
1da177e4 358 if (tbuf) {
f06febc9 359 struct tms tms;
1da177e4 360 struct compat_tms tmp;
f06febc9
FM		 361
362 do_sys_times(&tms);
363 /* Convert our struct tms to the compat version. */
364 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
365 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
366 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
367 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 368 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
369 return -EFAULT;
370 }
e3d5a27d 371 force_successful_syscall_return();
1da177e4
LT		 372 return compat_jiffies_to_clock_t(jiffies);
373}
374
be84cb43
CM		 375#ifdef __ARCH_WANT_SYS_SIGPENDING
376
1da177e4
LT		 377/*
378 * Assumption: old_sigset_t and compat_old_sigset_t are both
379 * types that can be passed to put_user()/get_user().
380 */
381
62a6fa97 382COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
1da177e4
LT		 383{
384 old_sigset_t s;
385 long ret;
386 mm_segment_t old_fs = get_fs();
387
388 set_fs(KERNEL_DS);
389 ret = sys_sigpending((old_sigset_t __user *) &s);
390 set_fs(old_fs);
391 if (ret == 0)
392 ret = put_user(s, set);
393 return ret;
394}
395
be84cb43
CM		 396#endif
397
398#ifdef __ARCH_WANT_SYS_SIGPROCMASK
399
b7dafa0e
JK		 400/*
401 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
402 * blocked set of signals to the supplied signal set
403 */
404static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
1da177e4 405{
b7dafa0e
JK		 406 memcpy(blocked->sig, &set, sizeof(set));
407}
1da177e4 408
5cf22100
AV		 409COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
410 compat_old_sigset_t __user *, nset,
411 compat_old_sigset_t __user *, oset)
b7dafa0e
JK		 412{
413 old_sigset_t old_set, new_set;
414 sigset_t new_blocked;
415
416 old_set = current->blocked.sig[0];
417
418 if (nset) {
419 if (get_user(new_set, nset))
420 return -EFAULT;
421 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
422
423 new_blocked = current->blocked;
424
425 switch (how) {
426 case SIG_BLOCK:
427 sigaddsetmask(&new_blocked, new_set);
428 break;
429 case SIG_UNBLOCK:
430 sigdelsetmask(&new_blocked, new_set);
431 break;
432 case SIG_SETMASK:
433 compat_sig_setmask(&new_blocked, new_set);
434 break;
435 default:
436 return -EINVAL;
437 }
438
439 set_current_blocked(&new_blocked);
440 }
441
442 if (oset) {
443 if (put_user(old_set, oset))
444 return -EFAULT;
445 }
446
447 return 0;
1da177e4
LT		 448}
449
be84cb43
CM		 450#endif
451
62a6fa97
HC		 452COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
453 struct compat_rlimit __user *, rlim)
1da177e4
LT		 454{
455 struct rlimit r;
1da177e4
LT		 456
457 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
458 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
459 __get_user(r.rlim_max, &rlim->rlim_max))
460 return -EFAULT;
461
462 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
463 r.rlim_cur = RLIM_INFINITY;
464 if (r.rlim_max == COMPAT_RLIM_INFINITY)
465 r.rlim_max = RLIM_INFINITY;
b9518345 466 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 467}
468
469#ifdef COMPAT_RLIM_OLD_INFINITY
470
62a6fa97
HC		 471COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
472 struct compat_rlimit __user *, rlim)
1da177e4
LT		 473{
474 struct rlimit r;
475 int ret;
476 mm_segment_t old_fs = get_fs();
477
478 set_fs(KERNEL_DS);
dce44e03 479 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
1da177e4
LT		 480 set_fs(old_fs);
481
482 if (!ret) {
483 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
484 r.rlim_cur = COMPAT_RLIM_INFINITY;
485 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
486 r.rlim_max = COMPAT_RLIM_INFINITY;
487
488 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
489 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
490 __put_user(r.rlim_max, &rlim->rlim_max))
491 return -EFAULT;
492 }
493 return ret;
494}
495
496#endif
497
62a6fa97
HC		 498COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
499 struct compat_rlimit __user *, rlim)
1da177e4
LT		 500{
501 struct rlimit r;
502 int ret;
1da177e4 503
b9518345 504 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 505 if (!ret) {
506 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
507 r.rlim_cur = COMPAT_RLIM_INFINITY;
508 if (r.rlim_max > COMPAT_RLIM_INFINITY)
509 r.rlim_max = COMPAT_RLIM_INFINITY;
510
511 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
512 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
513 __put_user(r.rlim_max, &rlim->rlim_max))
514 return -EFAULT;
515 }
516 return ret;
517}
518
519int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
520{
521 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
522 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
523 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
524 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
525 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
526 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
527 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
528 __put_user(r->ru_idrss, &ru->ru_idrss) ||
529 __put_user(r->ru_isrss, &ru->ru_isrss) ||
530 __put_user(r->ru_minflt, &ru->ru_minflt) ||
531 __put_user(r->ru_majflt, &ru->ru_majflt) ||
532 __put_user(r->ru_nswap, &ru->ru_nswap) ||
533 __put_user(r->ru_inblock, &ru->ru_inblock) ||
534 __put_user(r->ru_oublock, &ru->ru_oublock) ||
535 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
536 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
537 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
538 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
539 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
540 return -EFAULT;
541 return 0;
542}
543
8d9807b1
AV		 544COMPAT_SYSCALL_DEFINE4(wait4,
545 compat_pid_t, pid,
546 compat_uint_t __user *, stat_addr,
547 int, options,
548 struct compat_rusage __user *, ru)
1da177e4
LT		 549{
550 if (!ru) {
551 return sys_wait4(pid, stat_addr, options, NULL);
552 } else {
553 struct rusage r;
554 int ret;
555 unsigned int status;
556 mm_segment_t old_fs = get_fs();
557
558 set_fs (KERNEL_DS);
559 ret = sys_wait4(pid,
560 (stat_addr ?
561 (unsigned int __user *) &status : NULL),
562 options, (struct rusage __user *) &r);
563 set_fs (old_fs);
564
565 if (ret > 0) {
566 if (put_compat_rusage(&r, ru))
567 return -EFAULT;
568 if (stat_addr && put_user(status, stat_addr))
569 return -EFAULT;
570 }
571 return ret;
572 }
573}
574
8d9807b1
AV		 575COMPAT_SYSCALL_DEFINE5(waitid,
576 int, which, compat_pid_t, pid,
577 struct compat_siginfo __user *, uinfo, int, options,
578 struct compat_rusage __user *, uru)
1da177e4
LT		 579{
580 siginfo_t info;
581 struct rusage ru;
582 long ret;
583 mm_segment_t old_fs = get_fs();
584
585 memset(&info, 0, sizeof(info));
586
587 set_fs(KERNEL_DS);
588 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
589 uru ? (struct rusage __user *)&ru : NULL);
590 set_fs(old_fs);
591
592 if ((ret < 0) || (info.si_signo == 0))
593 return ret;
594
595 if (uru) {
a566c288
AV		 596 /* sys_waitid() overwrites everything in ru */
597 if (COMPAT_USE_64BIT_TIME)
598 ret = copy_to_user(uru, &ru, sizeof(ru));
599 else
600 ret = put_compat_rusage(&ru, uru);
1da177e4 601 if (ret)
bffea77c 602 return -EFAULT;
1da177e4
LT		 603 }
604
605 BUG_ON(info.si_code & __SI_MASK);
606 info.si_code |= __SI_CHLD;
607 return copy_siginfo_to_user32(uinfo, &info);
608}
609
610static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 611 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 612{
613 unsigned long *k;
614
a45185d2
RR		 615 if (len < cpumask_size())
616 memset(new_mask, 0, cpumask_size());
617 else if (len > cpumask_size())
618 len = cpumask_size();
1da177e4 619
a45185d2 620 k = cpumask_bits(new_mask);
1da177e4
LT		 621 return compat_get_bitmap(k, user_mask_ptr, len * 8);
622}
623
62a6fa97
HC		 624COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
625 unsigned int, len,
626 compat_ulong_t __user *, user_mask_ptr)
1da177e4 627{
a45185d2 628 cpumask_var_t new_mask;
1da177e4
LT		 629 int retval;
630
a45185d2
RR		 631 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
632 return -ENOMEM;
633
634 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 635 if (retval)
a45185d2 636 goto out;
1da177e4 637
a45185d2
RR		 638 retval = sched_setaffinity(pid, new_mask);
639out:
640 free_cpumask_var(new_mask);
641 return retval;
1da177e4
LT		 642}
643
62a6fa97
HC		 644COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
645 compat_ulong_t __user *, user_mask_ptr)
1da177e4
LT		 646{
647 int ret;
a45185d2 648 cpumask_var_t mask;
1da177e4 649
fa9dc265
KM		 650 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
651 return -EINVAL;
652 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 653 return -EINVAL;
654
a45185d2
RR		 655 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
656 return -ENOMEM;
657
658 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 659 if (ret == 0) {
660 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 661
fa9dc265
KM		 662 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
663 ret = -EFAULT;
664 else
665 ret = retlen;
666 }
a45185d2 667 free_cpumask_var(mask);
fa9dc265 668
a45185d2 669 return ret;
1da177e4
LT		 670}
671
83f5d126
DL		 672int get_compat_itimerspec(struct itimerspec *dst,
673 const struct compat_itimerspec __user *src)
bd3a8492 674{
81993e81
PA		 675 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
676 __compat_get_timespec(&dst->it_value, &src->it_value))
1da177e4
LT		 677 return -EFAULT;
678 return 0;
bd3a8492 679}
1da177e4 680
83f5d126
DL		 681int put_compat_itimerspec(struct compat_itimerspec __user *dst,
682 const struct itimerspec *src)
bd3a8492 683{
81993e81
PA		 684 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
685 __compat_put_timespec(&src->it_value, &dst->it_value))
1da177e4
LT		 686 return -EFAULT;
687 return 0;
bd3a8492 688}
1da177e4 689
62a6fa97
HC		 690COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
691 struct compat_sigevent __user *, timer_event_spec,
692 timer_t __user *, created_timer_id)
3a0f69d5
CH		 693{
694 struct sigevent __user *event = NULL;
695
696 if (timer_event_spec) {
697 struct sigevent kevent;
698
699 event = compat_alloc_user_space(sizeof(*event));
700 if (get_compat_sigevent(&kevent, timer_event_spec) ||
701 copy_to_user(event, &kevent, sizeof(*event)))
702 return -EFAULT;
703 }
704
705 return sys_timer_create(which_clock, event, created_timer_id);
706}
707
62a6fa97
HC		 708COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
709 struct compat_itimerspec __user *, new,
710 struct compat_itimerspec __user *, old)
bd3a8492 711{
1da177e4
LT		 712 long err;
713 mm_segment_t oldfs;
714 struct itimerspec newts, oldts;
715
716 if (!new)
717 return -EINVAL;
718 if (get_compat_itimerspec(&newts, new))
bd3a8492 719 return -EFAULT;
1da177e4
LT		 720 oldfs = get_fs();
721 set_fs(KERNEL_DS);
722 err = sys_timer_settime(timer_id, flags,
723 (struct itimerspec __user *) &newts,
724 (struct itimerspec __user *) &oldts);
bd3a8492 725 set_fs(oldfs);
1da177e4
LT		 726 if (!err && old && put_compat_itimerspec(old, &oldts))
727 return -EFAULT;
728 return err;
bd3a8492 729}
1da177e4 730
62a6fa97
HC		 731COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
732 struct compat_itimerspec __user *, setting)
bd3a8492 733{
1da177e4
LT		 734 long err;
735 mm_segment_t oldfs;
bd3a8492 736 struct itimerspec ts;
1da177e4
LT		 737
738 oldfs = get_fs();
739 set_fs(KERNEL_DS);
740 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 741 (struct itimerspec __user *) &ts);
742 set_fs(oldfs);
1da177e4
LT		 743 if (!err && put_compat_itimerspec(setting, &ts))
744 return -EFAULT;
745 return err;
bd3a8492 746}
1da177e4 747
62a6fa97
HC		 748COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
749 struct compat_timespec __user *, tp)
1da177e4
LT		 750{
751 long err;
752 mm_segment_t oldfs;
bd3a8492 753 struct timespec ts;
1da177e4 754
81993e81 755 if (compat_get_timespec(&ts, tp))
bd3a8492 756 return -EFAULT;
1da177e4 757 oldfs = get_fs();
bd3a8492 758 set_fs(KERNEL_DS);
1da177e4
LT		 759 err = sys_clock_settime(which_clock,
760 (struct timespec __user *) &ts);
761 set_fs(oldfs);
762 return err;
bd3a8492 763}
1da177e4 764
62a6fa97
HC		 765COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
766 struct compat_timespec __user *, tp)
1da177e4
LT		 767{
768 long err;
769 mm_segment_t oldfs;
bd3a8492 770 struct timespec ts;
1da177e4
LT		 771
772 oldfs = get_fs();
773 set_fs(KERNEL_DS);
774 err = sys_clock_gettime(which_clock,
775 (struct timespec __user *) &ts);
776 set_fs(oldfs);
81993e81 777 if (!err && compat_put_timespec(&ts, tp))
bd3a8492 778 return -EFAULT;
1da177e4 779 return err;
bd3a8492 780}
1da177e4 781
62a6fa97
HC		 782COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
783 struct compat_timex __user *, utp)
f1f1d5eb
RC		 784{
785 struct timex txc;
786 mm_segment_t oldfs;
787 int err, ret;
788
789 err = compat_get_timex(&txc, utp);
790 if (err)
791 return err;
792
793 oldfs = get_fs();
794 set_fs(KERNEL_DS);
795 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
796 set_fs(oldfs);
797
798 err = compat_put_timex(utp, &txc);
799 if (err)
800 return err;
801
802 return ret;
803}
804
62a6fa97
HC		 805COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
806 struct compat_timespec __user *, tp)
1da177e4
LT		 807{
808 long err;
809 mm_segment_t oldfs;
bd3a8492 810 struct timespec ts;
1da177e4
LT		 811
812 oldfs = get_fs();
813 set_fs(KERNEL_DS);
814 err = sys_clock_getres(which_clock,
815 (struct timespec __user *) &ts);
816 set_fs(oldfs);
81993e81 817 if (!err && tp && compat_put_timespec(&ts, tp))
bd3a8492 818 return -EFAULT;
1da177e4 819 return err;
bd3a8492 820}
1da177e4 821
1711ef38
TA		 822static long compat_clock_nanosleep_restart(struct restart_block *restart)
823{
824 long err;
825 mm_segment_t oldfs;
826 struct timespec tu;
dce44e03 827 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 828
029a07e0 829 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 830 oldfs = get_fs();
831 set_fs(KERNEL_DS);
832 err = clock_nanosleep_restart(restart);
833 set_fs(oldfs);
834
835 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
81993e81 836 compat_put_timespec(&tu, rmtp))
1711ef38
TA		 837 return -EFAULT;
838
839 if (err == -ERESTART_RESTARTBLOCK) {
840 restart->fn = compat_clock_nanosleep_restart;
029a07e0 841 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 842 }
843 return err;
844}
845
62a6fa97
HC		 846COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
847 struct compat_timespec __user *, rqtp,
848 struct compat_timespec __user *, rmtp)
1da177e4
LT		 849{
850 long err;
851 mm_segment_t oldfs;
bd3a8492 852 struct timespec in, out;
1711ef38 853 struct restart_block *restart;
1da177e4 854
81993e81 855 if (compat_get_timespec(&in, rqtp))
1da177e4
LT		 856 return -EFAULT;
857
858 oldfs = get_fs();
859 set_fs(KERNEL_DS);
860 err = sys_clock_nanosleep(which_clock, flags,
861 (struct timespec __user *) &in,
862 (struct timespec __user *) &out);
863 set_fs(oldfs);
1711ef38 864
1da177e4 865 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
81993e81 866 compat_put_timespec(&out, rmtp))
1da177e4 867 return -EFAULT;
1711ef38
TA		 868
869 if (err == -ERESTART_RESTARTBLOCK) {
f56141e3 870 restart = &current->restart_block;
1711ef38 871 restart->fn = compat_clock_nanosleep_restart;
029a07e0 872 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 873 }
bd3a8492
DW		 874 return err;
875}
1da177e4
LT		 876
877/*
878 * We currently only need the following fields from the sigevent
879 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
880 * sigev_notify_thread_id). The others are handled in user mode.
881 * We also assume that copying sigev_value.sival_int is sufficient
882 * to keep all the bits of sigev_value.sival_ptr intact.
883 */
884int get_compat_sigevent(struct sigevent *event,
885 const struct compat_sigevent __user *u_event)
886{
51410d3c 887 memset(event, 0, sizeof(*event));
1da177e4
LT		 888 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
889 __get_user(event->sigev_value.sival_int,
890 &u_event->sigev_value.sival_int) ||
891 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
892 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
893 __get_user(event->sigev_notify_thread_id,
894 &u_event->sigev_notify_thread_id))
895 ? -EFAULT : 0;
896}
897
5fa3839a 898long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 899 unsigned long bitmap_size)
900{
901 int i, j;
902 unsigned long m;
903 compat_ulong_t um;
904 unsigned long nr_compat_longs;
905
906 /* align bitmap up to nearest compat_long_t boundary */
907 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
908
909 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
910 return -EFAULT;
911
912 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
913
914 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
915 m = 0;
916
917 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
918 /*
919 * We dont want to read past the end of the userspace
920 * bitmap. We must however ensure the end of the
921 * kernel bitmap is zeroed.
922 */
9b7b819c
HD		 923 if (nr_compat_longs) {
924 nr_compat_longs--;
1da177e4
LT		 925 if (__get_user(um, umask))
926 return -EFAULT;
927 } else {
928 um = 0;
929 }
930
931 umask++;
932 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
933 }
934 *mask++ = m;
935 }
936
937 return 0;
938}
939
940long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
941 unsigned long bitmap_size)
942{
943 int i, j;
944 unsigned long m;
945 compat_ulong_t um;
946 unsigned long nr_compat_longs;
947
948 /* align bitmap up to nearest compat_long_t boundary */
949 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
950
951 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
952 return -EFAULT;
953
954 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
955
956 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
957 m = *mask++;
958
959 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
960 um = m;
961
962 /*
963 * We dont want to write past the end of the userspace
964 * bitmap.
965 */
9b7b819c
HD		 966 if (nr_compat_longs) {
967 nr_compat_longs--;
1da177e4
LT		 968 if (__put_user(um, umask))
969 return -EFAULT;
970 }
971
972 umask++;
973 m >>= 4*sizeof(um);
974 m >>= 4*sizeof(um);
975 }
976 }
977
978 return 0;
979}
980
981void
322a56cb 982sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
1da177e4
LT		 983{
984 switch (_NSIG_WORDS) {
1da177e4
LT		 985 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
986 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
987 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
988 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 989 }
990}
1dda606c 991EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4 992
322a56cb
AV		 993void
994sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
995{
996 switch (_NSIG_WORDS) {
997 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
998 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
999 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
1000 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
1001 }
1002}
1003
28d27f2d
AV		 1004COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
1005 struct compat_siginfo __user *, uinfo,
1006 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1da177e4
LT		 1007{
1008 compat_sigset_t s32;
1009 sigset_t s;
1da177e4
LT		 1010 struct timespec t;
1011 siginfo_t info;
943df148 1012 long ret;
1da177e4
LT		 1013
1014 if (sigsetsize != sizeof(sigset_t))
1015 return -EINVAL;
1016
1017 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1018 return -EFAULT;
1019 sigset_from_compat(&s, &s32);
1da177e4
LT		 1020
1021 if (uts) {
b2ddedcd 1022 if (compat_get_timespec(&t, uts))
1da177e4 1023 return -EFAULT;
1da177e4
LT		 1024 }
1025
943df148 1026 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 1027
943df148
ON		 1028 if (ret > 0 && uinfo) {
1029 if (copy_siginfo_to_user32(uinfo, &info))
1030 ret = -EFAULT;
1da177e4 1031 }
943df148 1032
1da177e4 1033 return ret;
62ab4505
TG		 1034}
1035
1da177e4
LT		 1036#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1037
1038/* compat_time_t is a 32 bit "long" and needs to get converted. */
1039
62a6fa97 1040COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1da177e4
LT		 1041{
1042 compat_time_t i;
1043 struct timeval tv;
1044
1045 do_gettimeofday(&tv);
1046 i = tv.tv_sec;
1047
1048 if (tloc) {
1049 if (put_user(i,tloc))
e3d5a27d 1050 return -EFAULT;
1da177e4 1051 }
e3d5a27d 1052 force_successful_syscall_return();
1da177e4
LT		 1053 return i;
1054}
1055
62a6fa97 1056COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1da177e4
LT		 1057{
1058 struct timespec tv;
1059 int err;
1060
1061 if (get_user(tv.tv_sec, tptr))
1062 return -EFAULT;
1063
1064 tv.tv_nsec = 0;
1065
1066 err = security_settime(&tv, NULL);
1067 if (err)
1068 return err;
1069
1070 do_settimeofday(&tv);
1071 return 0;
1072}
1073
1074#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8 1075
62a6fa97 1076COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
3158e941
SR		 1077{
1078 struct timex txc;
65f5d80b 1079 int err, ret;
3158e941 1080
65f5d80b
RC		 1081 err = compat_get_timex(&txc, utp);
1082 if (err)
1083 return err;
3158e941
SR		 1084
1085 ret = do_adjtimex(&txc);
1086
65f5d80b
RC		 1087 err = compat_put_timex(utp, &txc);
1088 if (err)
1089 return err;
3158e941
SR		 1090
1091 return ret;
1092}
1b2db9fb
CL		 1093
1094#ifdef CONFIG_NUMA
2f2728f6
HC		 1095COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1096 compat_uptr_t __user *, pages32,
1097 const int __user *, nodes,
1098 int __user *, status,
1099 int, flags)
1b2db9fb
CL		 1100{
1101 const void __user * __user *pages;
1102 int i;
1103
1104 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1105 for (i = 0; i < nr_pages; i++) {
1106 compat_uptr_t p;
1107
9216dfad 1108 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1109 put_user(compat_ptr(p), pages + i))
1110 return -EFAULT;
1111 }
1112 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1113}
3fd59397 1114
62a6fa97
HC		 1115COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1116 compat_ulong_t, maxnode,
1117 const compat_ulong_t __user *, old_nodes,
1118 const compat_ulong_t __user *, new_nodes)
3fd59397
SR		 1119{
1120 unsigned long __user *old = NULL;
1121 unsigned long __user *new = NULL;
1122 nodemask_t tmp_mask;
1123 unsigned long nr_bits;
1124 unsigned long size;
1125
1126 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1127 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1128 if (old_nodes) {
1129 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1130 return -EFAULT;
1131 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1132 if (new_nodes)
1133 new = old + size / sizeof(unsigned long);
1134 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1135 return -EFAULT;
1136 }
1137 if (new_nodes) {
1138 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1139 return -EFAULT;
1140 if (new == NULL)
1141 new = compat_alloc_user_space(size);
1142 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1143 return -EFAULT;
1144 }
1145 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1146}
1b2db9fb 1147#endif
d4d23add 1148
6883da8c
AV		 1149COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1150 compat_pid_t, pid,
1151 struct compat_timespec __user *, interval)
0ad50c38
CM		 1152{
1153 struct timespec t;
1154 int ret;
1155 mm_segment_t old_fs = get_fs();
1156
1157 set_fs(KERNEL_DS);
1158 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1159 set_fs(old_fs);
81993e81 1160 if (compat_put_timespec(&t, interval))
0ad50c38
CM		 1161 return -EFAULT;
1162 return ret;
1163}
0ad50c38 1164
c41d68a5
PA		 1165/*
1166 * Allocate user-space memory for the duration of a single system call,
1167 * in order to marshall parameters inside a compat thunk.
1168 */
1169void __user *compat_alloc_user_space(unsigned long len)
1170{
1171 void __user *ptr;
1172
1173 /* If len would occupy more than half of the entire compat space... */
1174 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1175 return NULL;
1176
1177 ptr = arch_compat_alloc_user_space(len);
1178
1179 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1180 return NULL;
1181
1182 return ptr;
1183}
1184EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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