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Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
[mirror_ubuntu-artful-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{
2ac00f17 111 struct timespec64 new_ts;
81993e81 112 struct timeval user_tv;
81993e81 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
2ac00f17 126 return do_sys_settimeofday64(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;
ad196384 243 struct timespec64 tu64;
41652937 244 mm_segment_t oldfs;
c70878b4 245 long ret;
1da177e4 246
81993e81 247 if (compat_get_timespec(&tu, rqtp))
1da177e4
LT		 248 return -EFAULT;
249
ad196384
DD		 250 tu64 = timespec_to_timespec64(tu);
251 if (!timespec64_valid(&tu64))
1da177e4
LT		 252 return -EINVAL;
253
41652937
ON		 254 oldfs = get_fs();
255 set_fs(KERNEL_DS);
ad196384 256 ret = hrtimer_nanosleep(&tu64,
41652937
ON		 257 rmtp ? (struct timespec __user *)&rmt : NULL,
258 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
259 set_fs(oldfs);
260
849151dd
TG		 261 /*
262 * hrtimer_nanosleep() can only return 0 or
263 * -ERESTART_RESTARTBLOCK here because:
264 *
265 * - we call it with HRTIMER_MODE_REL and therefor exclude the
266 * -ERESTARTNOHAND return path.
267 *
268 * - we supply the rmtp argument from the task stack (due to
269 * the necessary compat conversion. So the update cannot
270 * fail, which excludes the -EFAULT return path as well. If
271 * it fails nevertheless we have a bigger problem and wont
272 * reach this place anymore.
273 *
274 * - if the return value is 0, we do not have to update rmtp
275 * because there is no remaining time.
276 *
277 * We check for -ERESTART_RESTARTBLOCK nevertheless if the
278 * core implementation decides to return random nonsense.
279 */
280 if (ret == -ERESTART_RESTARTBLOCK) {
f56141e3 281 struct restart_block *restart = &current->restart_block;
41652937
ON		 282
283 restart->fn = compat_nanosleep_restart;
029a07e0 284 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 285
81993e81 286 if (rmtp && compat_put_timespec(&rmt, rmtp))
1da177e4
LT		 287 return -EFAULT;
288 }
c70878b4 289 return ret;
1da177e4
LT		 290}
291
292static inline long get_compat_itimerval(struct itimerval *o,
293 struct compat_itimerval __user *i)
294{
295 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
296 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
297 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
298 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
299 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
300}
301
302static inline long put_compat_itimerval(struct compat_itimerval __user *o,
303 struct itimerval *i)
304{
305 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
306 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
307 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
308 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
309 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
310}
311
baa73d9e
NP		 312asmlinkage long sys_ni_posix_timers(void);
313
37784074
AV		 314COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
315 struct compat_itimerval __user *, it)
1da177e4
LT		 316{
317 struct itimerval kit;
318 int error;
319
baa73d9e
NP		 320 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
321 return sys_ni_posix_timers();
322
1da177e4
LT		 323 error = do_getitimer(which, &kit);
324 if (!error && put_compat_itimerval(it, &kit))
325 error = -EFAULT;
326 return error;
327}
328
37784074
AV		 329COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
330 struct compat_itimerval __user *, in,
331 struct compat_itimerval __user *, out)
1da177e4
LT		 332{
333 struct itimerval kin, kout;
334 int error;
335
baa73d9e
NP		 336 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
337 return sys_ni_posix_timers();
338
1da177e4
LT		 339 if (in) {
340 if (get_compat_itimerval(&kin, in))
341 return -EFAULT;
342 } else
343 memset(&kin, 0, sizeof(kin));
344
345 error = do_setitimer(which, &kin, out ? &kout : NULL);
346 if (error || !out)
347 return error;
348 if (put_compat_itimerval(out, &kout))
349 return -EFAULT;
350 return 0;
351}
352
f06febc9
FM		 353static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
354{
355 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
356}
357
62a6fa97 358COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
1da177e4 359{
1da177e4 360 if (tbuf) {
f06febc9 361 struct tms tms;
1da177e4 362 struct compat_tms tmp;
f06febc9
FM		 363
364 do_sys_times(&tms);
365 /* Convert our struct tms to the compat version. */
366 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
367 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
368 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
369 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 370 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
371 return -EFAULT;
372 }
e3d5a27d 373 force_successful_syscall_return();
1da177e4
LT		 374 return compat_jiffies_to_clock_t(jiffies);
375}
376
be84cb43
CM		 377#ifdef __ARCH_WANT_SYS_SIGPENDING
378
1da177e4
LT		 379/*
380 * Assumption: old_sigset_t and compat_old_sigset_t are both
381 * types that can be passed to put_user()/get_user().
382 */
383
62a6fa97 384COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
1da177e4
LT		 385{
386 old_sigset_t s;
387 long ret;
388 mm_segment_t old_fs = get_fs();
389
390 set_fs(KERNEL_DS);
391 ret = sys_sigpending((old_sigset_t __user *) &s);
392 set_fs(old_fs);
393 if (ret == 0)
394 ret = put_user(s, set);
395 return ret;
396}
397
be84cb43
CM		 398#endif
399
400#ifdef __ARCH_WANT_SYS_SIGPROCMASK
401
b7dafa0e
JK		 402/*
403 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
404 * blocked set of signals to the supplied signal set
405 */
406static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
1da177e4 407{
b7dafa0e
JK		 408 memcpy(blocked->sig, &set, sizeof(set));
409}
1da177e4 410
5cf22100
AV		 411COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
412 compat_old_sigset_t __user *, nset,
413 compat_old_sigset_t __user *, oset)
b7dafa0e
JK		 414{
415 old_sigset_t old_set, new_set;
416 sigset_t new_blocked;
417
418 old_set = current->blocked.sig[0];
419
420 if (nset) {
421 if (get_user(new_set, nset))
422 return -EFAULT;
423 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
424
425 new_blocked = current->blocked;
426
427 switch (how) {
428 case SIG_BLOCK:
429 sigaddsetmask(&new_blocked, new_set);
430 break;
431 case SIG_UNBLOCK:
432 sigdelsetmask(&new_blocked, new_set);
433 break;
434 case SIG_SETMASK:
435 compat_sig_setmask(&new_blocked, new_set);
436 break;
437 default:
438 return -EINVAL;
439 }
440
441 set_current_blocked(&new_blocked);
442 }
443
444 if (oset) {
445 if (put_user(old_set, oset))
446 return -EFAULT;
447 }
448
449 return 0;
1da177e4
LT		 450}
451
be84cb43
CM		 452#endif
453
62a6fa97
HC		 454COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
455 struct compat_rlimit __user *, rlim)
1da177e4
LT		 456{
457 struct rlimit r;
1da177e4
LT		 458
459 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
460 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
461 __get_user(r.rlim_max, &rlim->rlim_max))
462 return -EFAULT;
463
464 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
465 r.rlim_cur = RLIM_INFINITY;
466 if (r.rlim_max == COMPAT_RLIM_INFINITY)
467 r.rlim_max = RLIM_INFINITY;
b9518345 468 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 469}
470
471#ifdef COMPAT_RLIM_OLD_INFINITY
472
62a6fa97
HC		 473COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
474 struct compat_rlimit __user *, rlim)
1da177e4
LT		 475{
476 struct rlimit r;
477 int ret;
478 mm_segment_t old_fs = get_fs();
479
480 set_fs(KERNEL_DS);
dce44e03 481 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
1da177e4
LT		 482 set_fs(old_fs);
483
484 if (!ret) {
485 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
486 r.rlim_cur = COMPAT_RLIM_INFINITY;
487 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
488 r.rlim_max = COMPAT_RLIM_INFINITY;
489
490 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
491 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
492 __put_user(r.rlim_max, &rlim->rlim_max))
493 return -EFAULT;
494 }
495 return ret;
496}
497
498#endif
499
62a6fa97
HC		 500COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
501 struct compat_rlimit __user *, rlim)
1da177e4
LT		 502{
503 struct rlimit r;
504 int ret;
1da177e4 505
b9518345 506 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 507 if (!ret) {
508 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
509 r.rlim_cur = COMPAT_RLIM_INFINITY;
510 if (r.rlim_max > COMPAT_RLIM_INFINITY)
511 r.rlim_max = COMPAT_RLIM_INFINITY;
512
513 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
514 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
515 __put_user(r.rlim_max, &rlim->rlim_max))
516 return -EFAULT;
517 }
518 return ret;
519}
520
521int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
522{
523 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
524 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
525 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
526 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
527 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
528 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
529 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
530 __put_user(r->ru_idrss, &ru->ru_idrss) ||
531 __put_user(r->ru_isrss, &ru->ru_isrss) ||
532 __put_user(r->ru_minflt, &ru->ru_minflt) ||
533 __put_user(r->ru_majflt, &ru->ru_majflt) ||
534 __put_user(r->ru_nswap, &ru->ru_nswap) ||
535 __put_user(r->ru_inblock, &ru->ru_inblock) ||
536 __put_user(r->ru_oublock, &ru->ru_oublock) ||
537 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
538 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
539 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
540 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
541 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
542 return -EFAULT;
543 return 0;
544}
545
8d9807b1
AV		 546COMPAT_SYSCALL_DEFINE4(wait4,
547 compat_pid_t, pid,
548 compat_uint_t __user *, stat_addr,
549 int, options,
550 struct compat_rusage __user *, ru)
1da177e4
LT		 551{
552 if (!ru) {
553 return sys_wait4(pid, stat_addr, options, NULL);
554 } else {
555 struct rusage r;
556 int ret;
557 unsigned int status;
558 mm_segment_t old_fs = get_fs();
559
560 set_fs (KERNEL_DS);
561 ret = sys_wait4(pid,
562 (stat_addr ?
563 (unsigned int __user *) &status : NULL),
564 options, (struct rusage __user *) &r);
565 set_fs (old_fs);
566
567 if (ret > 0) {
568 if (put_compat_rusage(&r, ru))
569 return -EFAULT;
570 if (stat_addr && put_user(status, stat_addr))
571 return -EFAULT;
572 }
573 return ret;
574 }
575}
576
8d9807b1
AV		 577COMPAT_SYSCALL_DEFINE5(waitid,
578 int, which, compat_pid_t, pid,
579 struct compat_siginfo __user *, uinfo, int, options,
580 struct compat_rusage __user *, uru)
1da177e4
LT		 581{
582 siginfo_t info;
583 struct rusage ru;
584 long ret;
585 mm_segment_t old_fs = get_fs();
586
587 memset(&info, 0, sizeof(info));
588
589 set_fs(KERNEL_DS);
590 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
591 uru ? (struct rusage __user *)&ru : NULL);
592 set_fs(old_fs);
593
594 if ((ret < 0) || (info.si_signo == 0))
595 return ret;
596
597 if (uru) {
a566c288
AV		 598 /* sys_waitid() overwrites everything in ru */
599 if (COMPAT_USE_64BIT_TIME)
600 ret = copy_to_user(uru, &ru, sizeof(ru));
601 else
602 ret = put_compat_rusage(&ru, uru);
1da177e4 603 if (ret)
bffea77c 604 return -EFAULT;
1da177e4
LT		 605 }
606
607 BUG_ON(info.si_code & __SI_MASK);
608 info.si_code |= __SI_CHLD;
609 return copy_siginfo_to_user32(uinfo, &info);
610}
611
612static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 613 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 614{
615 unsigned long *k;
616
a45185d2
RR		 617 if (len < cpumask_size())
618 memset(new_mask, 0, cpumask_size());
619 else if (len > cpumask_size())
620 len = cpumask_size();
1da177e4 621
a45185d2 622 k = cpumask_bits(new_mask);
1da177e4
LT		 623 return compat_get_bitmap(k, user_mask_ptr, len * 8);
624}
625
62a6fa97
HC		 626COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
627 unsigned int, len,
628 compat_ulong_t __user *, user_mask_ptr)
1da177e4 629{
a45185d2 630 cpumask_var_t new_mask;
1da177e4
LT		 631 int retval;
632
a45185d2
RR		 633 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
634 return -ENOMEM;
635
636 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 637 if (retval)
a45185d2 638 goto out;
1da177e4 639
a45185d2
RR		 640 retval = sched_setaffinity(pid, new_mask);
641out:
642 free_cpumask_var(new_mask);
643 return retval;
1da177e4
LT		 644}
645
62a6fa97
HC		 646COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
647 compat_ulong_t __user *, user_mask_ptr)
1da177e4
LT		 648{
649 int ret;
a45185d2 650 cpumask_var_t mask;
1da177e4 651
fa9dc265
KM		 652 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
653 return -EINVAL;
654 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 655 return -EINVAL;
656
a45185d2
RR		 657 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
658 return -ENOMEM;
659
660 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 661 if (ret == 0) {
662 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 663
fa9dc265
KM		 664 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
665 ret = -EFAULT;
666 else
667 ret = retlen;
668 }
a45185d2 669 free_cpumask_var(mask);
fa9dc265 670
a45185d2 671 return ret;
1da177e4
LT		 672}
673
83f5d126
DL		 674int get_compat_itimerspec(struct itimerspec *dst,
675 const struct compat_itimerspec __user *src)
bd3a8492 676{
81993e81
PA		 677 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
678 __compat_get_timespec(&dst->it_value, &src->it_value))
1da177e4
LT		 679 return -EFAULT;
680 return 0;
bd3a8492 681}
1da177e4 682
83f5d126
DL		 683int put_compat_itimerspec(struct compat_itimerspec __user *dst,
684 const struct itimerspec *src)
bd3a8492 685{
81993e81
PA		 686 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
687 __compat_put_timespec(&src->it_value, &dst->it_value))
1da177e4
LT		 688 return -EFAULT;
689 return 0;
bd3a8492 690}
1da177e4 691
62a6fa97
HC		 692COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
693 struct compat_sigevent __user *, timer_event_spec,
694 timer_t __user *, created_timer_id)
3a0f69d5
CH		 695{
696 struct sigevent __user *event = NULL;
697
698 if (timer_event_spec) {
699 struct sigevent kevent;
700
701 event = compat_alloc_user_space(sizeof(*event));
702 if (get_compat_sigevent(&kevent, timer_event_spec) ||
703 copy_to_user(event, &kevent, sizeof(*event)))
704 return -EFAULT;
705 }
706
707 return sys_timer_create(which_clock, event, created_timer_id);
708}
709
62a6fa97
HC		 710COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
711 struct compat_itimerspec __user *, new,
712 struct compat_itimerspec __user *, old)
bd3a8492 713{
1da177e4
LT		 714 long err;
715 mm_segment_t oldfs;
716 struct itimerspec newts, oldts;
717
718 if (!new)
719 return -EINVAL;
720 if (get_compat_itimerspec(&newts, new))
bd3a8492 721 return -EFAULT;
1da177e4
LT		 722 oldfs = get_fs();
723 set_fs(KERNEL_DS);
724 err = sys_timer_settime(timer_id, flags,
725 (struct itimerspec __user *) &newts,
726 (struct itimerspec __user *) &oldts);
bd3a8492 727 set_fs(oldfs);
1da177e4
LT		 728 if (!err && old && put_compat_itimerspec(old, &oldts))
729 return -EFAULT;
730 return err;
bd3a8492 731}
1da177e4 732
62a6fa97
HC		 733COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
734 struct compat_itimerspec __user *, setting)
bd3a8492 735{
1da177e4
LT		 736 long err;
737 mm_segment_t oldfs;
bd3a8492 738 struct itimerspec ts;
1da177e4
LT		 739
740 oldfs = get_fs();
741 set_fs(KERNEL_DS);
742 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 743 (struct itimerspec __user *) &ts);
744 set_fs(oldfs);
1da177e4
LT		 745 if (!err && put_compat_itimerspec(setting, &ts))
746 return -EFAULT;
747 return err;
bd3a8492 748}
1da177e4 749
62a6fa97
HC		 750COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
751 struct compat_timespec __user *, tp)
1da177e4
LT		 752{
753 long err;
754 mm_segment_t oldfs;
bd3a8492 755 struct timespec ts;
1da177e4 756
81993e81 757 if (compat_get_timespec(&ts, tp))
bd3a8492 758 return -EFAULT;
1da177e4 759 oldfs = get_fs();
bd3a8492 760 set_fs(KERNEL_DS);
1da177e4
LT		 761 err = sys_clock_settime(which_clock,
762 (struct timespec __user *) &ts);
763 set_fs(oldfs);
764 return err;
bd3a8492 765}
1da177e4 766
62a6fa97
HC		 767COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
768 struct compat_timespec __user *, tp)
1da177e4
LT		 769{
770 long err;
771 mm_segment_t oldfs;
bd3a8492 772 struct timespec ts;
1da177e4
LT		 773
774 oldfs = get_fs();
775 set_fs(KERNEL_DS);
776 err = sys_clock_gettime(which_clock,
777 (struct timespec __user *) &ts);
778 set_fs(oldfs);
81993e81 779 if (!err && compat_put_timespec(&ts, tp))
bd3a8492 780 return -EFAULT;
1da177e4 781 return err;
bd3a8492 782}
1da177e4 783
62a6fa97
HC		 784COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
785 struct compat_timex __user *, utp)
f1f1d5eb
RC		 786{
787 struct timex txc;
788 mm_segment_t oldfs;
789 int err, ret;
790
791 err = compat_get_timex(&txc, utp);
792 if (err)
793 return err;
794
795 oldfs = get_fs();
796 set_fs(KERNEL_DS);
797 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
798 set_fs(oldfs);
799
800 err = compat_put_timex(utp, &txc);
801 if (err)
802 return err;
803
804 return ret;
805}
806
62a6fa97
HC		 807COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
808 struct compat_timespec __user *, tp)
1da177e4
LT		 809{
810 long err;
811 mm_segment_t oldfs;
bd3a8492 812 struct timespec ts;
1da177e4
LT		 813
814 oldfs = get_fs();
815 set_fs(KERNEL_DS);
816 err = sys_clock_getres(which_clock,
817 (struct timespec __user *) &ts);
818 set_fs(oldfs);
81993e81 819 if (!err && tp && compat_put_timespec(&ts, tp))
bd3a8492 820 return -EFAULT;
1da177e4 821 return err;
bd3a8492 822}
1da177e4 823
1711ef38
TA		 824static long compat_clock_nanosleep_restart(struct restart_block *restart)
825{
826 long err;
827 mm_segment_t oldfs;
828 struct timespec tu;
dce44e03 829 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 830
029a07e0 831 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 832 oldfs = get_fs();
833 set_fs(KERNEL_DS);
834 err = clock_nanosleep_restart(restart);
835 set_fs(oldfs);
836
837 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
81993e81 838 compat_put_timespec(&tu, rmtp))
1711ef38
TA		 839 return -EFAULT;
840
841 if (err == -ERESTART_RESTARTBLOCK) {
842 restart->fn = compat_clock_nanosleep_restart;
029a07e0 843 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 844 }
845 return err;
846}
847
62a6fa97
HC		 848COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
849 struct compat_timespec __user *, rqtp,
850 struct compat_timespec __user *, rmtp)
1da177e4
LT		 851{
852 long err;
853 mm_segment_t oldfs;
bd3a8492 854 struct timespec in, out;
1711ef38 855 struct restart_block *restart;
1da177e4 856
81993e81 857 if (compat_get_timespec(&in, rqtp))
1da177e4
LT		 858 return -EFAULT;
859
860 oldfs = get_fs();
861 set_fs(KERNEL_DS);
862 err = sys_clock_nanosleep(which_clock, flags,
863 (struct timespec __user *) &in,
864 (struct timespec __user *) &out);
865 set_fs(oldfs);
1711ef38 866
1da177e4 867 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
81993e81 868 compat_put_timespec(&out, rmtp))
1da177e4 869 return -EFAULT;
1711ef38
TA		 870
871 if (err == -ERESTART_RESTARTBLOCK) {
f56141e3 872 restart = &current->restart_block;
1711ef38 873 restart->fn = compat_clock_nanosleep_restart;
029a07e0 874 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 875 }
bd3a8492
DW		 876 return err;
877}
1da177e4
LT		 878
879/*
880 * We currently only need the following fields from the sigevent
881 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
882 * sigev_notify_thread_id). The others are handled in user mode.
883 * We also assume that copying sigev_value.sival_int is sufficient
884 * to keep all the bits of sigev_value.sival_ptr intact.
885 */
886int get_compat_sigevent(struct sigevent *event,
887 const struct compat_sigevent __user *u_event)
888{
51410d3c 889 memset(event, 0, sizeof(*event));
1da177e4
LT		 890 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
891 __get_user(event->sigev_value.sival_int,
892 &u_event->sigev_value.sival_int) ||
893 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
894 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
895 __get_user(event->sigev_notify_thread_id,
896 &u_event->sigev_notify_thread_id))
897 ? -EFAULT : 0;
898}
899
5fa3839a 900long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 901 unsigned long bitmap_size)
902{
903 int i, j;
904 unsigned long m;
905 compat_ulong_t um;
906 unsigned long nr_compat_longs;
907
908 /* align bitmap up to nearest compat_long_t boundary */
909 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
910
911 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
912 return -EFAULT;
913
914 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
915
916 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
917 m = 0;
918
919 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
920 /*
921 * We dont want to read past the end of the userspace
922 * bitmap. We must however ensure the end of the
923 * kernel bitmap is zeroed.
924 */
9b7b819c
HD		 925 if (nr_compat_longs) {
926 nr_compat_longs--;
1da177e4
LT		 927 if (__get_user(um, umask))
928 return -EFAULT;
929 } else {
930 um = 0;
931 }
932
933 umask++;
934 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
935 }
936 *mask++ = m;
937 }
938
939 return 0;
940}
941
942long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
943 unsigned long bitmap_size)
944{
945 int i, j;
946 unsigned long m;
947 compat_ulong_t um;
948 unsigned long nr_compat_longs;
949
950 /* align bitmap up to nearest compat_long_t boundary */
951 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
952
953 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
954 return -EFAULT;
955
956 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
957
958 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
959 m = *mask++;
960
961 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
962 um = m;
963
964 /*
965 * We dont want to write past the end of the userspace
966 * bitmap.
967 */
9b7b819c
HD		 968 if (nr_compat_longs) {
969 nr_compat_longs--;
1da177e4
LT		 970 if (__put_user(um, umask))
971 return -EFAULT;
972 }
973
974 umask++;
975 m >>= 4*sizeof(um);
976 m >>= 4*sizeof(um);
977 }
978 }
979
980 return 0;
981}
982
983void
322a56cb 984sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
1da177e4
LT		 985{
986 switch (_NSIG_WORDS) {
1da177e4
LT		 987 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
988 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
989 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
990 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 991 }
992}
1dda606c 993EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4 994
322a56cb
AV		 995void
996sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
997{
998 switch (_NSIG_WORDS) {
999 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
1000 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
1001 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
1002 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
1003 }
1004}
1005
28d27f2d
AV		 1006COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
1007 struct compat_siginfo __user *, uinfo,
1008 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1da177e4
LT		 1009{
1010 compat_sigset_t s32;
1011 sigset_t s;
1da177e4
LT		 1012 struct timespec t;
1013 siginfo_t info;
943df148 1014 long ret;
1da177e4
LT		 1015
1016 if (sigsetsize != sizeof(sigset_t))
1017 return -EINVAL;
1018
1019 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1020 return -EFAULT;
1021 sigset_from_compat(&s, &s32);
1da177e4
LT		 1022
1023 if (uts) {
b2ddedcd 1024 if (compat_get_timespec(&t, uts))
1da177e4 1025 return -EFAULT;
1da177e4
LT		 1026 }
1027
943df148 1028 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 1029
943df148
ON		 1030 if (ret > 0 && uinfo) {
1031 if (copy_siginfo_to_user32(uinfo, &info))
1032 ret = -EFAULT;
1da177e4 1033 }
943df148 1034
1da177e4 1035 return ret;
62ab4505
TG		 1036}
1037
1da177e4
LT		 1038#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1039
1040/* compat_time_t is a 32 bit "long" and needs to get converted. */
1041
62a6fa97 1042COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1da177e4
LT		 1043{
1044 compat_time_t i;
1045 struct timeval tv;
1046
1047 do_gettimeofday(&tv);
1048 i = tv.tv_sec;
1049
1050 if (tloc) {
1051 if (put_user(i,tloc))
e3d5a27d 1052 return -EFAULT;
1da177e4 1053 }
e3d5a27d 1054 force_successful_syscall_return();
1da177e4
LT		 1055 return i;
1056}
1057
62a6fa97 1058COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1da177e4
LT		 1059{
1060 struct timespec tv;
1061 int err;
1062
1063 if (get_user(tv.tv_sec, tptr))
1064 return -EFAULT;
1065
1066 tv.tv_nsec = 0;
1067
1068 err = security_settime(&tv, NULL);
1069 if (err)
1070 return err;
1071
1072 do_settimeofday(&tv);
1073 return 0;
1074}
1075
1076#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8 1077
62a6fa97 1078COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
3158e941
SR		 1079{
1080 struct timex txc;
65f5d80b 1081 int err, ret;
3158e941 1082
65f5d80b
RC		 1083 err = compat_get_timex(&txc, utp);
1084 if (err)
1085 return err;
3158e941
SR		 1086
1087 ret = do_adjtimex(&txc);
1088
65f5d80b
RC		 1089 err = compat_put_timex(utp, &txc);
1090 if (err)
1091 return err;
3158e941
SR		 1092
1093 return ret;
1094}
1b2db9fb
CL		 1095
1096#ifdef CONFIG_NUMA
2f2728f6
HC		 1097COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1098 compat_uptr_t __user *, pages32,
1099 const int __user *, nodes,
1100 int __user *, status,
1101 int, flags)
1b2db9fb
CL		 1102{
1103 const void __user * __user *pages;
1104 int i;
1105
1106 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1107 for (i = 0; i < nr_pages; i++) {
1108 compat_uptr_t p;
1109
9216dfad 1110 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1111 put_user(compat_ptr(p), pages + i))
1112 return -EFAULT;
1113 }
1114 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1115}
3fd59397 1116
62a6fa97
HC		 1117COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1118 compat_ulong_t, maxnode,
1119 const compat_ulong_t __user *, old_nodes,
1120 const compat_ulong_t __user *, new_nodes)
3fd59397
SR		 1121{
1122 unsigned long __user *old = NULL;
1123 unsigned long __user *new = NULL;
1124 nodemask_t tmp_mask;
1125 unsigned long nr_bits;
1126 unsigned long size;
1127
1128 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1129 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1130 if (old_nodes) {
1131 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1132 return -EFAULT;
1133 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1134 if (new_nodes)
1135 new = old + size / sizeof(unsigned long);
1136 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1137 return -EFAULT;
1138 }
1139 if (new_nodes) {
1140 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1141 return -EFAULT;
1142 if (new == NULL)
1143 new = compat_alloc_user_space(size);
1144 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1145 return -EFAULT;
1146 }
1147 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1148}
1b2db9fb 1149#endif
d4d23add 1150
6883da8c
AV		 1151COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1152 compat_pid_t, pid,
1153 struct compat_timespec __user *, interval)
0ad50c38
CM		 1154{
1155 struct timespec t;
1156 int ret;
1157 mm_segment_t old_fs = get_fs();
1158
1159 set_fs(KERNEL_DS);
1160 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1161 set_fs(old_fs);
81993e81 1162 if (compat_put_timespec(&t, interval))
0ad50c38
CM		 1163 return -EFAULT;
1164 return ret;
1165}
0ad50c38 1166
c41d68a5
PA		 1167/*
1168 * Allocate user-space memory for the duration of a single system call,
1169 * in order to marshall parameters inside a compat thunk.
1170 */
1171void __user *compat_alloc_user_space(unsigned long len)
1172{
1173 void __user *ptr;
1174
1175 /* If len would occupy more than half of the entire compat space... */
1176 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1177 return NULL;
1178
1179 ptr = arch_compat_alloc_user_space(len);
1180
1181 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1182 return NULL;
1183
1184 return ptr;
1185}
1186EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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