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switch compat_sys_rt_sigtimedwait to COMPAT_SYSCALL_DEFINE
[GitHub/mt8127/android_kernel_alcatel_ttab.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
LT		 30
31#include <asm/uaccess.h>
1da177e4 32
b418da16 33/*
6684ba20 34 * Get/set struct timeval with struct timespec on the native side
b418da16 35 */
6684ba20
PA		 36static int compat_get_timeval_convert(struct timespec *o,
37 struct compat_timeval __user *i)
b418da16
CH		 38{
39 long usec;
40
41 if (get_user(o->tv_sec, &i->tv_sec) ||
42 get_user(usec, &i->tv_usec))
43 return -EFAULT;
44 o->tv_nsec = usec * 1000;
45 return 0;
46}
47
6684ba20
PA		 48static int compat_put_timeval_convert(struct compat_timeval __user *o,
49 struct timeval *i)
b418da16
CH		 50{
51 return (put_user(i->tv_sec, &o->tv_sec) ||
52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
53}
54
65f5d80b
RC		 55static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
56{
57 memset(txc, 0, sizeof(struct timex));
58
59 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
60 __get_user(txc->modes, &utp->modes) ||
61 __get_user(txc->offset, &utp->offset) ||
62 __get_user(txc->freq, &utp->freq) ||
63 __get_user(txc->maxerror, &utp->maxerror) ||
64 __get_user(txc->esterror, &utp->esterror) ||
65 __get_user(txc->status, &utp->status) ||
66 __get_user(txc->constant, &utp->constant) ||
67 __get_user(txc->precision, &utp->precision) ||
68 __get_user(txc->tolerance, &utp->tolerance) ||
69 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
70 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
71 __get_user(txc->tick, &utp->tick) ||
72 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
73 __get_user(txc->jitter, &utp->jitter) ||
74 __get_user(txc->shift, &utp->shift) ||
75 __get_user(txc->stabil, &utp->stabil) ||
76 __get_user(txc->jitcnt, &utp->jitcnt) ||
77 __get_user(txc->calcnt, &utp->calcnt) ||
78 __get_user(txc->errcnt, &utp->errcnt) ||
79 __get_user(txc->stbcnt, &utp->stbcnt))
80 return -EFAULT;
81
82 return 0;
83}
84
85static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
86{
87 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
88 __put_user(txc->modes, &utp->modes) ||
89 __put_user(txc->offset, &utp->offset) ||
90 __put_user(txc->freq, &utp->freq) ||
91 __put_user(txc->maxerror, &utp->maxerror) ||
92 __put_user(txc->esterror, &utp->esterror) ||
93 __put_user(txc->status, &utp->status) ||
94 __put_user(txc->constant, &utp->constant) ||
95 __put_user(txc->precision, &utp->precision) ||
96 __put_user(txc->tolerance, &utp->tolerance) ||
97 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
98 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
99 __put_user(txc->tick, &utp->tick) ||
100 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
101 __put_user(txc->jitter, &utp->jitter) ||
102 __put_user(txc->shift, &utp->shift) ||
103 __put_user(txc->stabil, &utp->stabil) ||
104 __put_user(txc->jitcnt, &utp->jitcnt) ||
105 __put_user(txc->calcnt, &utp->calcnt) ||
106 __put_user(txc->errcnt, &utp->errcnt) ||
107 __put_user(txc->stbcnt, &utp->stbcnt) ||
108 __put_user(txc->tai, &utp->tai))
109 return -EFAULT;
110 return 0;
111}
112
b418da16
CH		 113asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
114 struct timezone __user *tz)
115{
116 if (tv) {
117 struct timeval ktv;
118 do_gettimeofday(&ktv);
6684ba20 119 if (compat_put_timeval_convert(tv, &ktv))
b418da16
CH		 120 return -EFAULT;
121 }
122 if (tz) {
123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
124 return -EFAULT;
125 }
126
127 return 0;
128}
129
130asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
131 struct timezone __user *tz)
132{
133 struct timespec kts;
134 struct timezone ktz;
135
136 if (tv) {
6684ba20 137 if (compat_get_timeval_convert(&kts, tv))
b418da16
CH		 138 return -EFAULT;
139 }
140 if (tz) {
141 if (copy_from_user(&ktz, tz, sizeof(ktz)))
142 return -EFAULT;
143 }
144
145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
146}
147
6684ba20
PA		 148int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
149{
150 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
151 __get_user(tv->tv_sec, &ctv->tv_sec) ||
152 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
153}
154EXPORT_SYMBOL_GPL(get_compat_timeval);
155
156int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
157{
158 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
159 __put_user(tv->tv_sec, &ctv->tv_sec) ||
160 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
161}
162EXPORT_SYMBOL_GPL(put_compat_timeval);
163
1da177e4
LT		 164int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
165{
166 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
167 __get_user(ts->tv_sec, &cts->tv_sec) ||
168 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
169}
6684ba20 170EXPORT_SYMBOL_GPL(get_compat_timespec);
1da177e4
LT		 171
172int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
173{
174 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
175 __put_user(ts->tv_sec, &cts->tv_sec) ||
176 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
177}
2330fb82 178EXPORT_SYMBOL_GPL(put_compat_timespec);
1da177e4 179
6684ba20
PA		 180int compat_get_timeval(struct timeval *tv, const void __user *utv)
181{
182 if (COMPAT_USE_64BIT_TIME)
183 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
184 else
185 return get_compat_timeval(tv, utv);
186}
187EXPORT_SYMBOL_GPL(compat_get_timeval);
188
189int compat_put_timeval(const struct timeval *tv, void __user *utv)
190{
191 if (COMPAT_USE_64BIT_TIME)
192 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
193 else
194 return put_compat_timeval(tv, utv);
195}
196EXPORT_SYMBOL_GPL(compat_put_timeval);
197
198int compat_get_timespec(struct timespec *ts, const void __user *uts)
199{
200 if (COMPAT_USE_64BIT_TIME)
201 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
202 else
203 return get_compat_timespec(ts, uts);
204}
205EXPORT_SYMBOL_GPL(compat_get_timespec);
206
207int compat_put_timespec(const struct timespec *ts, void __user *uts)
208{
209 if (COMPAT_USE_64BIT_TIME)
210 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
211 else
212 return put_compat_timespec(ts, uts);
213}
214EXPORT_SYMBOL_GPL(compat_put_timespec);
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
229 if (ret) {
029a07e0 230 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 231
232 if (rmtp && put_compat_timespec(&rmt, rmtp))
233 return -EFAULT;
234 }
235
236 return ret;
237}
238
1da177e4 239asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 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
c70878b4 246 if (get_compat_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
259 if (ret) {
260 struct restart_block *restart
261 = &current_thread_info()->restart_block;
262
263 restart->fn = compat_nanosleep_restart;
029a07e0 264 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 265
41652937 266 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 267 return -EFAULT;
268 }
c70878b4
AB		 269
270 return ret;
1da177e4
LT		 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
37784074
AV		 293COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
294 struct compat_itimerval __user *, it)
1da177e4
LT		 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
37784074
AV		 305COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
306 struct compat_itimerval __user *, in,
307 struct compat_itimerval __user *, out)
1da177e4
LT		 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
f06febc9
FM		 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
1da177e4
LT		 331asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
332{
1da177e4 333 if (tbuf) {
f06febc9 334 struct tms tms;
1da177e4 335 struct compat_tms tmp;
f06febc9
FM		 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);
1da177e4
LT		 343 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
344 return -EFAULT;
345 }
e3d5a27d 346 force_successful_syscall_return();
1da177e4
LT		 347 return compat_jiffies_to_clock_t(jiffies);
348}
349
be84cb43
CM		 350#ifdef __ARCH_WANT_SYS_SIGPENDING
351
1da177e4
LT		 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
357asmlinkage long compat_sys_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
be84cb43
CM		 371#endif
372
373#ifdef __ARCH_WANT_SYS_SIGPROCMASK
374
b7dafa0e
JK		 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)
1da177e4 380{
b7dafa0e
JK		 381 memcpy(blocked->sig, &set, sizeof(set));
382}
1da177e4 383
b7dafa0e
JK		 384asmlinkage long compat_sys_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;
1da177e4
LT		 423}
424
be84cb43
CM		 425#endif
426
1da177e4
LT		 427asmlinkage long compat_sys_setrlimit(unsigned int resource,
428 struct compat_rlimit __user *rlim)
429{
430 struct rlimit r;
1da177e4
LT		 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;
b9518345 441 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 442}
443
444#ifdef COMPAT_RLIM_OLD_INFINITY
445
446asmlinkage long compat_sys_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, &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
b9518345 473asmlinkage long compat_sys_getrlimit(unsigned int resource,
1da177e4
LT		 474 struct compat_rlimit __user *rlim)
475{
476 struct rlimit r;
477 int ret;
1da177e4 478
b9518345 479 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 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
519asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
520{
521 struct rusage r;
522 int ret;
523 mm_segment_t old_fs = get_fs();
524
525 set_fs(KERNEL_DS);
526 ret = sys_getrusage(who, (struct rusage __user *) &r);
527 set_fs(old_fs);
528
529 if (ret)
530 return ret;
531
532 if (put_compat_rusage(&r, ru))
533 return -EFAULT;
534
535 return 0;
536}
537
8d9807b1
AV		 538COMPAT_SYSCALL_DEFINE4(wait4,
539 compat_pid_t, pid,
540 compat_uint_t __user *, stat_addr,
541 int, options,
542 struct compat_rusage __user *, ru)
1da177e4
LT		 543{
544 if (!ru) {
545 return sys_wait4(pid, stat_addr, options, NULL);
546 } else {
547 struct rusage r;
548 int ret;
549 unsigned int status;
550 mm_segment_t old_fs = get_fs();
551
552 set_fs (KERNEL_DS);
553 ret = sys_wait4(pid,
554 (stat_addr ?
555 (unsigned int __user *) &status : NULL),
556 options, (struct rusage __user *) &r);
557 set_fs (old_fs);
558
559 if (ret > 0) {
560 if (put_compat_rusage(&r, ru))
561 return -EFAULT;
562 if (stat_addr && put_user(status, stat_addr))
563 return -EFAULT;
564 }
565 return ret;
566 }
567}
568
8d9807b1
AV		 569COMPAT_SYSCALL_DEFINE5(waitid,
570 int, which, compat_pid_t, pid,
571 struct compat_siginfo __user *, uinfo, int, options,
572 struct compat_rusage __user *, uru)
1da177e4
LT		 573{
574 siginfo_t info;
575 struct rusage ru;
576 long ret;
577 mm_segment_t old_fs = get_fs();
578
579 memset(&info, 0, sizeof(info));
580
581 set_fs(KERNEL_DS);
582 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
583 uru ? (struct rusage __user *)&ru : NULL);
584 set_fs(old_fs);
585
586 if ((ret < 0) || (info.si_signo == 0))
587 return ret;
588
589 if (uru) {
a566c288
AV		 590 /* sys_waitid() overwrites everything in ru */
591 if (COMPAT_USE_64BIT_TIME)
592 ret = copy_to_user(uru, &ru, sizeof(ru));
593 else
594 ret = put_compat_rusage(&ru, uru);
1da177e4
LT		 595 if (ret)
596 return ret;
597 }
598
599 BUG_ON(info.si_code & __SI_MASK);
600 info.si_code |= __SI_CHLD;
601 return copy_siginfo_to_user32(uinfo, &info);
602}
603
604static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 605 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 606{
607 unsigned long *k;
608
a45185d2
RR		 609 if (len < cpumask_size())
610 memset(new_mask, 0, cpumask_size());
611 else if (len > cpumask_size())
612 len = cpumask_size();
1da177e4 613
a45185d2 614 k = cpumask_bits(new_mask);
1da177e4
LT		 615 return compat_get_bitmap(k, user_mask_ptr, len * 8);
616}
617
618asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
619 unsigned int len,
620 compat_ulong_t __user *user_mask_ptr)
621{
a45185d2 622 cpumask_var_t new_mask;
1da177e4
LT		 623 int retval;
624
a45185d2
RR		 625 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
626 return -ENOMEM;
627
628 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 629 if (retval)
a45185d2 630 goto out;
1da177e4 631
a45185d2
RR		 632 retval = sched_setaffinity(pid, new_mask);
633out:
634 free_cpumask_var(new_mask);
635 return retval;
1da177e4
LT		 636}
637
638asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
639 compat_ulong_t __user *user_mask_ptr)
640{
641 int ret;
a45185d2 642 cpumask_var_t mask;
1da177e4 643
fa9dc265
KM		 644 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
645 return -EINVAL;
646 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 647 return -EINVAL;
648
a45185d2
RR		 649 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
650 return -ENOMEM;
651
652 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 653 if (ret == 0) {
654 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 655
fa9dc265
KM		 656 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
657 ret = -EFAULT;
658 else
659 ret = retlen;
660 }
a45185d2 661 free_cpumask_var(mask);
fa9dc265 662
a45185d2 663 return ret;
1da177e4
LT		 664}
665
83f5d126
DL		 666int get_compat_itimerspec(struct itimerspec *dst,
667 const struct compat_itimerspec __user *src)
bd3a8492 668{
1da177e4
LT		 669 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
670 get_compat_timespec(&dst->it_value, &src->it_value))
671 return -EFAULT;
672 return 0;
bd3a8492 673}
1da177e4 674
83f5d126
DL		 675int put_compat_itimerspec(struct compat_itimerspec __user *dst,
676 const struct itimerspec *src)
bd3a8492 677{
1da177e4
LT		 678 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
679 put_compat_timespec(&src->it_value, &dst->it_value))
680 return -EFAULT;
681 return 0;
bd3a8492 682}
1da177e4 683
3a0f69d5
CH		 684long compat_sys_timer_create(clockid_t which_clock,
685 struct compat_sigevent __user *timer_event_spec,
686 timer_t __user *created_timer_id)
687{
688 struct sigevent __user *event = NULL;
689
690 if (timer_event_spec) {
691 struct sigevent kevent;
692
693 event = compat_alloc_user_space(sizeof(*event));
694 if (get_compat_sigevent(&kevent, timer_event_spec) ||
695 copy_to_user(event, &kevent, sizeof(*event)))
696 return -EFAULT;
697 }
698
699 return sys_timer_create(which_clock, event, created_timer_id);
700}
701
1da177e4 702long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 703 struct compat_itimerspec __user *new,
1da177e4 704 struct compat_itimerspec __user *old)
bd3a8492 705{
1da177e4
LT		 706 long err;
707 mm_segment_t oldfs;
708 struct itimerspec newts, oldts;
709
710 if (!new)
711 return -EINVAL;
712 if (get_compat_itimerspec(&newts, new))
bd3a8492 713 return -EFAULT;
1da177e4
LT		 714 oldfs = get_fs();
715 set_fs(KERNEL_DS);
716 err = sys_timer_settime(timer_id, flags,
717 (struct itimerspec __user *) &newts,
718 (struct itimerspec __user *) &oldts);
bd3a8492 719 set_fs(oldfs);
1da177e4
LT		 720 if (!err && old && put_compat_itimerspec(old, &oldts))
721 return -EFAULT;
722 return err;
bd3a8492 723}
1da177e4
LT		 724
725long compat_sys_timer_gettime(timer_t timer_id,
726 struct compat_itimerspec __user *setting)
bd3a8492 727{
1da177e4
LT		 728 long err;
729 mm_segment_t oldfs;
bd3a8492 730 struct itimerspec ts;
1da177e4
LT		 731
732 oldfs = get_fs();
733 set_fs(KERNEL_DS);
734 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 735 (struct itimerspec __user *) &ts);
736 set_fs(oldfs);
1da177e4
LT		 737 if (!err && put_compat_itimerspec(setting, &ts))
738 return -EFAULT;
739 return err;
bd3a8492 740}
1da177e4
LT		 741
742long compat_sys_clock_settime(clockid_t which_clock,
743 struct compat_timespec __user *tp)
744{
745 long err;
746 mm_segment_t oldfs;
bd3a8492 747 struct timespec ts;
1da177e4
LT		 748
749 if (get_compat_timespec(&ts, tp))
bd3a8492 750 return -EFAULT;
1da177e4 751 oldfs = get_fs();
bd3a8492 752 set_fs(KERNEL_DS);
1da177e4
LT		 753 err = sys_clock_settime(which_clock,
754 (struct timespec __user *) &ts);
755 set_fs(oldfs);
756 return err;
bd3a8492 757}
1da177e4
LT		 758
759long compat_sys_clock_gettime(clockid_t which_clock,
760 struct compat_timespec __user *tp)
761{
762 long err;
763 mm_segment_t oldfs;
bd3a8492 764 struct timespec ts;
1da177e4
LT		 765
766 oldfs = get_fs();
767 set_fs(KERNEL_DS);
768 err = sys_clock_gettime(which_clock,
769 (struct timespec __user *) &ts);
770 set_fs(oldfs);
771 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 772 return -EFAULT;
1da177e4 773 return err;
bd3a8492 774}
1da177e4 775
f1f1d5eb
RC		 776long compat_sys_clock_adjtime(clockid_t which_clock,
777 struct compat_timex __user *utp)
778{
779 struct timex txc;
780 mm_segment_t oldfs;
781 int err, ret;
782
783 err = compat_get_timex(&txc, utp);
784 if (err)
785 return err;
786
787 oldfs = get_fs();
788 set_fs(KERNEL_DS);
789 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
790 set_fs(oldfs);
791
792 err = compat_put_timex(utp, &txc);
793 if (err)
794 return err;
795
796 return ret;
797}
798
1da177e4
LT		 799long compat_sys_clock_getres(clockid_t which_clock,
800 struct compat_timespec __user *tp)
801{
802 long err;
803 mm_segment_t oldfs;
bd3a8492 804 struct timespec ts;
1da177e4
LT		 805
806 oldfs = get_fs();
807 set_fs(KERNEL_DS);
808 err = sys_clock_getres(which_clock,
809 (struct timespec __user *) &ts);
810 set_fs(oldfs);
811 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 812 return -EFAULT;
1da177e4 813 return err;
bd3a8492 814}
1da177e4 815
1711ef38
TA		 816static long compat_clock_nanosleep_restart(struct restart_block *restart)
817{
818 long err;
819 mm_segment_t oldfs;
820 struct timespec tu;
029a07e0 821 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 822
029a07e0 823 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 824 oldfs = get_fs();
825 set_fs(KERNEL_DS);
826 err = clock_nanosleep_restart(restart);
827 set_fs(oldfs);
828
829 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
830 put_compat_timespec(&tu, rmtp))
831 return -EFAULT;
832
833 if (err == -ERESTART_RESTARTBLOCK) {
834 restart->fn = compat_clock_nanosleep_restart;
029a07e0 835 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 836 }
837 return err;
838}
839
1da177e4
LT		 840long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
841 struct compat_timespec __user *rqtp,
842 struct compat_timespec __user *rmtp)
843{
844 long err;
845 mm_segment_t oldfs;
bd3a8492 846 struct timespec in, out;
1711ef38 847 struct restart_block *restart;
1da177e4 848
bd3a8492 849 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 850 return -EFAULT;
851
852 oldfs = get_fs();
853 set_fs(KERNEL_DS);
854 err = sys_clock_nanosleep(which_clock, flags,
855 (struct timespec __user *) &in,
856 (struct timespec __user *) &out);
857 set_fs(oldfs);
1711ef38 858
1da177e4
LT		 859 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
860 put_compat_timespec(&out, rmtp))
861 return -EFAULT;
1711ef38
TA		 862
863 if (err == -ERESTART_RESTARTBLOCK) {
864 restart = &current_thread_info()->restart_block;
865 restart->fn = compat_clock_nanosleep_restart;
029a07e0 866 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 867 }
bd3a8492
DW		 868 return err;
869}
1da177e4
LT		 870
871/*
872 * We currently only need the following fields from the sigevent
873 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
874 * sigev_notify_thread_id). The others are handled in user mode.
875 * We also assume that copying sigev_value.sival_int is sufficient
876 * to keep all the bits of sigev_value.sival_ptr intact.
877 */
878int get_compat_sigevent(struct sigevent *event,
879 const struct compat_sigevent __user *u_event)
880{
51410d3c 881 memset(event, 0, sizeof(*event));
1da177e4
LT		 882 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
883 __get_user(event->sigev_value.sival_int,
884 &u_event->sigev_value.sival_int) ||
885 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
886 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
887 __get_user(event->sigev_notify_thread_id,
888 &u_event->sigev_notify_thread_id))
889 ? -EFAULT : 0;
890}
891
5fa3839a 892long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 893 unsigned long bitmap_size)
894{
895 int i, j;
896 unsigned long m;
897 compat_ulong_t um;
898 unsigned long nr_compat_longs;
899
900 /* align bitmap up to nearest compat_long_t boundary */
901 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
902
903 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
904 return -EFAULT;
905
906 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
907
908 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
909 m = 0;
910
911 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
912 /*
913 * We dont want to read past the end of the userspace
914 * bitmap. We must however ensure the end of the
915 * kernel bitmap is zeroed.
916 */
917 if (nr_compat_longs-- > 0) {
918 if (__get_user(um, umask))
919 return -EFAULT;
920 } else {
921 um = 0;
922 }
923
924 umask++;
925 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
926 }
927 *mask++ = m;
928 }
929
930 return 0;
931}
932
933long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
934 unsigned long bitmap_size)
935{
936 int i, j;
937 unsigned long m;
938 compat_ulong_t um;
939 unsigned long nr_compat_longs;
940
941 /* align bitmap up to nearest compat_long_t boundary */
942 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
943
944 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
945 return -EFAULT;
946
947 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
948
949 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
950 m = *mask++;
951
952 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
953 um = m;
954
955 /*
956 * We dont want to write past the end of the userspace
957 * bitmap.
958 */
959 if (nr_compat_longs-- > 0) {
960 if (__put_user(um, umask))
961 return -EFAULT;
962 }
963
964 umask++;
965 m >>= 4*sizeof(um);
966 m >>= 4*sizeof(um);
967 }
968 }
969
970 return 0;
971}
972
973void
322a56cb 974sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
1da177e4
LT		 975{
976 switch (_NSIG_WORDS) {
1da177e4
LT		 977 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
978 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
979 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
980 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 981 }
982}
1dda606c 983EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4 984
322a56cb
AV		 985void
986sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
987{
988 switch (_NSIG_WORDS) {
989 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
990 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
991 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
992 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
993 }
994}
995
28d27f2d
AV		 996COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
997 struct compat_siginfo __user *, uinfo,
998 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1da177e4
LT		 999{
1000 compat_sigset_t s32;
1001 sigset_t s;
1da177e4
LT		 1002 struct timespec t;
1003 siginfo_t info;
943df148 1004 long ret;
1da177e4
LT		 1005
1006 if (sigsetsize != sizeof(sigset_t))
1007 return -EINVAL;
1008
1009 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1010 return -EFAULT;
1011 sigset_from_compat(&s, &s32);
1da177e4
LT		 1012
1013 if (uts) {
b2ddedcd 1014 if (compat_get_timespec(&t, uts))
1da177e4 1015 return -EFAULT;
1da177e4
LT		 1016 }
1017
943df148 1018 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 1019
943df148
ON		 1020 if (ret > 0 && uinfo) {
1021 if (copy_siginfo_to_user32(uinfo, &info))
1022 ret = -EFAULT;
1da177e4 1023 }
943df148 1024
1da177e4 1025 return ret;
1da177e4
LT		 1026}
1027
62ab4505
TG		 1028asmlinkage long
1029compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
1030 struct compat_siginfo __user *uinfo)
1031{
1032 siginfo_t info;
1033
1034 if (copy_siginfo_from_user32(&info, uinfo))
1035 return -EFAULT;
1036 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
1037}
1038
1da177e4
LT		 1039#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1040
1041/* compat_time_t is a 32 bit "long" and needs to get converted. */
1042
1043asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1044{
1045 compat_time_t i;
1046 struct timeval tv;
1047
1048 do_gettimeofday(&tv);
1049 i = tv.tv_sec;
1050
1051 if (tloc) {
1052 if (put_user(i,tloc))
e3d5a27d 1053 return -EFAULT;
1da177e4 1054 }
e3d5a27d 1055 force_successful_syscall_return();
1da177e4
LT		 1056 return i;
1057}
1058
1059asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1060{
1061 struct timespec tv;
1062 int err;
1063
1064 if (get_user(tv.tv_sec, tptr))
1065 return -EFAULT;
1066
1067 tv.tv_nsec = 0;
1068
1069 err = security_settime(&tv, NULL);
1070 if (err)
1071 return err;
1072
1073 do_settimeofday(&tv);
1074 return 0;
1075}
1076
1077#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8 1078
3158e941
SR		 1079asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1080{
1081 struct timex txc;
65f5d80b 1082 int err, ret;
3158e941 1083
65f5d80b
RC		 1084 err = compat_get_timex(&txc, utp);
1085 if (err)
1086 return err;
3158e941
SR		 1087
1088 ret = do_adjtimex(&txc);
1089
65f5d80b
RC		 1090 err = compat_put_timex(utp, &txc);
1091 if (err)
1092 return err;
3158e941
SR		 1093
1094 return ret;
1095}
1b2db9fb
CL		 1096
1097#ifdef CONFIG_NUMA
1098asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1099 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1100 const int __user *nodes,
1101 int __user *status,
1102 int flags)
1103{
1104 const void __user * __user *pages;
1105 int i;
1106
1107 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1108 for (i = 0; i < nr_pages; i++) {
1109 compat_uptr_t p;
1110
9216dfad 1111 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1112 put_user(compat_ptr(p), pages + i))
1113 return -EFAULT;
1114 }
1115 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1116}
3fd59397
SR		 1117
1118asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1119 compat_ulong_t maxnode,
1120 const compat_ulong_t __user *old_nodes,
1121 const compat_ulong_t __user *new_nodes)
1122{
1123 unsigned long __user *old = NULL;
1124 unsigned long __user *new = NULL;
1125 nodemask_t tmp_mask;
1126 unsigned long nr_bits;
1127 unsigned long size;
1128
1129 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1130 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1131 if (old_nodes) {
1132 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1133 return -EFAULT;
1134 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1135 if (new_nodes)
1136 new = old + size / sizeof(unsigned long);
1137 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1138 return -EFAULT;
1139 }
1140 if (new_nodes) {
1141 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1142 return -EFAULT;
1143 if (new == NULL)
1144 new = compat_alloc_user_space(size);
1145 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1146 return -EFAULT;
1147 }
1148 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1149}
1b2db9fb 1150#endif
d4d23add
KM		 1151
1152struct compat_sysinfo {
1153 s32 uptime;
1154 u32 loads[3];
1155 u32 totalram;
1156 u32 freeram;
1157 u32 sharedram;
1158 u32 bufferram;
1159 u32 totalswap;
1160 u32 freeswap;
1161 u16 procs;
1162 u16 pad;
1163 u32 totalhigh;
1164 u32 freehigh;
1165 u32 mem_unit;
1166 char _f[20-2*sizeof(u32)-sizeof(int)];
1167};
1168
1169asmlinkage long
1170compat_sys_sysinfo(struct compat_sysinfo __user *info)
1171{
1172 struct sysinfo s;
1173
1174 do_sysinfo(&s);
1175
1176 /* Check to see if any memory value is too large for 32-bit and scale
1177 * down if needed
1178 */
1179 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1180 int bitcount = 0;
1181
1182 while (s.mem_unit < PAGE_SIZE) {
1183 s.mem_unit <<= 1;
1184 bitcount++;
1185 }
1186
1187 s.totalram >>= bitcount;
1188 s.freeram >>= bitcount;
1189 s.sharedram >>= bitcount;
1190 s.bufferram >>= bitcount;
1191 s.totalswap >>= bitcount;
1192 s.freeswap >>= bitcount;
1193 s.totalhigh >>= bitcount;
1194 s.freehigh >>= bitcount;
1195 }
1196
1197 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1198 __put_user (s.uptime, &info->uptime) ||
1199 __put_user (s.loads[0], &info->loads[0]) ||
1200 __put_user (s.loads[1], &info->loads[1]) ||
1201 __put_user (s.loads[2], &info->loads[2]) ||
1202 __put_user (s.totalram, &info->totalram) ||
1203 __put_user (s.freeram, &info->freeram) ||
1204 __put_user (s.sharedram, &info->sharedram) ||
1205 __put_user (s.bufferram, &info->bufferram) ||
1206 __put_user (s.totalswap, &info->totalswap) ||
1207 __put_user (s.freeswap, &info->freeswap) ||
1208 __put_user (s.procs, &info->procs) ||
1209 __put_user (s.totalhigh, &info->totalhigh) ||
1210 __put_user (s.freehigh, &info->freehigh) ||
1211 __put_user (s.mem_unit, &info->mem_unit))
1212 return -EFAULT;
1213
1214 return 0;
1215}
c41d68a5 1216
0ad50c38
CM		 1217#ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
1218asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
1219 struct compat_timespec __user *interval)
1220{
1221 struct timespec t;
1222 int ret;
1223 mm_segment_t old_fs = get_fs();
1224
1225 set_fs(KERNEL_DS);
1226 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1227 set_fs(old_fs);
1228 if (put_compat_timespec(&t, interval))
1229 return -EFAULT;
1230 return ret;
1231}
1232#endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */
1233
c41d68a5
PA		 1234/*
1235 * Allocate user-space memory for the duration of a single system call,
1236 * in order to marshall parameters inside a compat thunk.
1237 */
1238void __user *compat_alloc_user_space(unsigned long len)
1239{
1240 void __user *ptr;
1241
1242 /* If len would occupy more than half of the entire compat space... */
1243 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1244 return NULL;
1245
1246 ptr = arch_compat_alloc_user_space(len);
1247
1248 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1249 return NULL;
1250
1251 return ptr;
1252}
1253EXPORT_SYMBOL_GPL(compat_alloc_user_space);
kernel source for telekom puls (alcatel/mediatek)