]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - kernel/compat.c
projects / mirror_ubuntu-zesty-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
switch compat_sys_sigaltstack() to COMPAT_SYSCALL_DEFINE
[mirror_ubuntu-zesty-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
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
293asmlinkage long compat_sys_getitimer(int which,
294 struct compat_itimerval __user *it)
295{
296 struct itimerval kit;
297 int error;
298
299 error = do_getitimer(which, &kit);
300 if (!error && put_compat_itimerval(it, &kit))
301 error = -EFAULT;
302 return error;
303}
304
305asmlinkage long compat_sys_setitimer(int which,
306 struct compat_itimerval __user *in,
307 struct compat_itimerval __user *out)
308{
309 struct itimerval kin, kout;
310 int error;
311
312 if (in) {
313 if (get_compat_itimerval(&kin, in))
314 return -EFAULT;
315 } else
316 memset(&kin, 0, sizeof(kin));
317
318 error = do_setitimer(which, &kin, out ? &kout : NULL);
319 if (error || !out)
320 return error;
321 if (put_compat_itimerval(out, &kout))
322 return -EFAULT;
323 return 0;
324}
325
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
538asmlinkage long
539compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
540 struct compat_rusage __user *ru)
541{
542 if (!ru) {
543 return sys_wait4(pid, stat_addr, options, NULL);
544 } else {
545 struct rusage r;
546 int ret;
547 unsigned int status;
548 mm_segment_t old_fs = get_fs();
549
550 set_fs (KERNEL_DS);
551 ret = sys_wait4(pid,
552 (stat_addr ?
553 (unsigned int __user *) &status : NULL),
554 options, (struct rusage __user *) &r);
555 set_fs (old_fs);
556
557 if (ret > 0) {
558 if (put_compat_rusage(&r, ru))
559 return -EFAULT;
560 if (stat_addr && put_user(status, stat_addr))
561 return -EFAULT;
562 }
563 return ret;
564 }
565}
566
567asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
568 struct compat_siginfo __user *uinfo, int options,
569 struct compat_rusage __user *uru)
570{
571 siginfo_t info;
572 struct rusage ru;
573 long ret;
574 mm_segment_t old_fs = get_fs();
575
576 memset(&info, 0, sizeof(info));
577
578 set_fs(KERNEL_DS);
579 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
580 uru ? (struct rusage __user *)&ru : NULL);
581 set_fs(old_fs);
582
583 if ((ret < 0) || (info.si_signo == 0))
584 return ret;
585
586 if (uru) {
587 ret = put_compat_rusage(&ru, uru);
588 if (ret)
589 return ret;
590 }
591
592 BUG_ON(info.si_code & __SI_MASK);
593 info.si_code |= __SI_CHLD;
594 return copy_siginfo_to_user32(uinfo, &info);
595}
596
597static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 598 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 599{
600 unsigned long *k;
601
a45185d2
RR		 602 if (len < cpumask_size())
603 memset(new_mask, 0, cpumask_size());
604 else if (len > cpumask_size())
605 len = cpumask_size();
1da177e4 606
a45185d2 607 k = cpumask_bits(new_mask);
1da177e4
LT		 608 return compat_get_bitmap(k, user_mask_ptr, len * 8);
609}
610
611asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
612 unsigned int len,
613 compat_ulong_t __user *user_mask_ptr)
614{
a45185d2 615 cpumask_var_t new_mask;
1da177e4
LT		 616 int retval;
617
a45185d2
RR		 618 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
619 return -ENOMEM;
620
621 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 622 if (retval)
a45185d2 623 goto out;
1da177e4 624
a45185d2
RR		 625 retval = sched_setaffinity(pid, new_mask);
626out:
627 free_cpumask_var(new_mask);
628 return retval;
1da177e4
LT		 629}
630
631asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
632 compat_ulong_t __user *user_mask_ptr)
633{
634 int ret;
a45185d2 635 cpumask_var_t mask;
1da177e4 636
fa9dc265
KM		 637 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
638 return -EINVAL;
639 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 640 return -EINVAL;
641
a45185d2
RR		 642 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
643 return -ENOMEM;
644
645 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 646 if (ret == 0) {
647 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 648
fa9dc265
KM		 649 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
650 ret = -EFAULT;
651 else
652 ret = retlen;
653 }
a45185d2 654 free_cpumask_var(mask);
fa9dc265 655
a45185d2 656 return ret;
1da177e4
LT		 657}
658
83f5d126
DL		 659int get_compat_itimerspec(struct itimerspec *dst,
660 const struct compat_itimerspec __user *src)
bd3a8492 661{
1da177e4
LT		 662 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
663 get_compat_timespec(&dst->it_value, &src->it_value))
664 return -EFAULT;
665 return 0;
bd3a8492 666}
1da177e4 667
83f5d126
DL		 668int put_compat_itimerspec(struct compat_itimerspec __user *dst,
669 const struct itimerspec *src)
bd3a8492 670{
1da177e4
LT		 671 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
672 put_compat_timespec(&src->it_value, &dst->it_value))
673 return -EFAULT;
674 return 0;
bd3a8492 675}
1da177e4 676
3a0f69d5
CH		 677long compat_sys_timer_create(clockid_t which_clock,
678 struct compat_sigevent __user *timer_event_spec,
679 timer_t __user *created_timer_id)
680{
681 struct sigevent __user *event = NULL;
682
683 if (timer_event_spec) {
684 struct sigevent kevent;
685
686 event = compat_alloc_user_space(sizeof(*event));
687 if (get_compat_sigevent(&kevent, timer_event_spec) ||
688 copy_to_user(event, &kevent, sizeof(*event)))
689 return -EFAULT;
690 }
691
692 return sys_timer_create(which_clock, event, created_timer_id);
693}
694
1da177e4 695long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 696 struct compat_itimerspec __user *new,
1da177e4 697 struct compat_itimerspec __user *old)
bd3a8492 698{
1da177e4
LT		 699 long err;
700 mm_segment_t oldfs;
701 struct itimerspec newts, oldts;
702
703 if (!new)
704 return -EINVAL;
705 if (get_compat_itimerspec(&newts, new))
bd3a8492 706 return -EFAULT;
1da177e4
LT		 707 oldfs = get_fs();
708 set_fs(KERNEL_DS);
709 err = sys_timer_settime(timer_id, flags,
710 (struct itimerspec __user *) &newts,
711 (struct itimerspec __user *) &oldts);
bd3a8492 712 set_fs(oldfs);
1da177e4
LT		 713 if (!err && old && put_compat_itimerspec(old, &oldts))
714 return -EFAULT;
715 return err;
bd3a8492 716}
1da177e4
LT		 717
718long compat_sys_timer_gettime(timer_t timer_id,
719 struct compat_itimerspec __user *setting)
bd3a8492 720{
1da177e4
LT		 721 long err;
722 mm_segment_t oldfs;
bd3a8492 723 struct itimerspec ts;
1da177e4
LT		 724
725 oldfs = get_fs();
726 set_fs(KERNEL_DS);
727 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 728 (struct itimerspec __user *) &ts);
729 set_fs(oldfs);
1da177e4
LT		 730 if (!err && put_compat_itimerspec(setting, &ts))
731 return -EFAULT;
732 return err;
bd3a8492 733}
1da177e4
LT		 734
735long compat_sys_clock_settime(clockid_t which_clock,
736 struct compat_timespec __user *tp)
737{
738 long err;
739 mm_segment_t oldfs;
bd3a8492 740 struct timespec ts;
1da177e4
LT		 741
742 if (get_compat_timespec(&ts, tp))
bd3a8492 743 return -EFAULT;
1da177e4 744 oldfs = get_fs();
bd3a8492 745 set_fs(KERNEL_DS);
1da177e4
LT		 746 err = sys_clock_settime(which_clock,
747 (struct timespec __user *) &ts);
748 set_fs(oldfs);
749 return err;
bd3a8492 750}
1da177e4
LT		 751
752long compat_sys_clock_gettime(clockid_t which_clock,
753 struct compat_timespec __user *tp)
754{
755 long err;
756 mm_segment_t oldfs;
bd3a8492 757 struct timespec ts;
1da177e4
LT		 758
759 oldfs = get_fs();
760 set_fs(KERNEL_DS);
761 err = sys_clock_gettime(which_clock,
762 (struct timespec __user *) &ts);
763 set_fs(oldfs);
764 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 765 return -EFAULT;
1da177e4 766 return err;
bd3a8492 767}
1da177e4 768
f1f1d5eb
RC		 769long compat_sys_clock_adjtime(clockid_t which_clock,
770 struct compat_timex __user *utp)
771{
772 struct timex txc;
773 mm_segment_t oldfs;
774 int err, ret;
775
776 err = compat_get_timex(&txc, utp);
777 if (err)
778 return err;
779
780 oldfs = get_fs();
781 set_fs(KERNEL_DS);
782 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
783 set_fs(oldfs);
784
785 err = compat_put_timex(utp, &txc);
786 if (err)
787 return err;
788
789 return ret;
790}
791
1da177e4
LT		 792long compat_sys_clock_getres(clockid_t which_clock,
793 struct compat_timespec __user *tp)
794{
795 long err;
796 mm_segment_t oldfs;
bd3a8492 797 struct timespec ts;
1da177e4
LT		 798
799 oldfs = get_fs();
800 set_fs(KERNEL_DS);
801 err = sys_clock_getres(which_clock,
802 (struct timespec __user *) &ts);
803 set_fs(oldfs);
804 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 805 return -EFAULT;
1da177e4 806 return err;
bd3a8492 807}
1da177e4 808
1711ef38
TA		 809static long compat_clock_nanosleep_restart(struct restart_block *restart)
810{
811 long err;
812 mm_segment_t oldfs;
813 struct timespec tu;
029a07e0 814 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 815
029a07e0 816 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 817 oldfs = get_fs();
818 set_fs(KERNEL_DS);
819 err = clock_nanosleep_restart(restart);
820 set_fs(oldfs);
821
822 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
823 put_compat_timespec(&tu, rmtp))
824 return -EFAULT;
825
826 if (err == -ERESTART_RESTARTBLOCK) {
827 restart->fn = compat_clock_nanosleep_restart;
029a07e0 828 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 829 }
830 return err;
831}
832
1da177e4
LT		 833long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
834 struct compat_timespec __user *rqtp,
835 struct compat_timespec __user *rmtp)
836{
837 long err;
838 mm_segment_t oldfs;
bd3a8492 839 struct timespec in, out;
1711ef38 840 struct restart_block *restart;
1da177e4 841
bd3a8492 842 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 843 return -EFAULT;
844
845 oldfs = get_fs();
846 set_fs(KERNEL_DS);
847 err = sys_clock_nanosleep(which_clock, flags,
848 (struct timespec __user *) &in,
849 (struct timespec __user *) &out);
850 set_fs(oldfs);
1711ef38 851
1da177e4
LT		 852 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
853 put_compat_timespec(&out, rmtp))
854 return -EFAULT;
1711ef38
TA		 855
856 if (err == -ERESTART_RESTARTBLOCK) {
857 restart = &current_thread_info()->restart_block;
858 restart->fn = compat_clock_nanosleep_restart;
029a07e0 859 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 860 }
bd3a8492
DW		 861 return err;
862}
1da177e4
LT		 863
864/*
865 * We currently only need the following fields from the sigevent
866 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
867 * sigev_notify_thread_id). The others are handled in user mode.
868 * We also assume that copying sigev_value.sival_int is sufficient
869 * to keep all the bits of sigev_value.sival_ptr intact.
870 */
871int get_compat_sigevent(struct sigevent *event,
872 const struct compat_sigevent __user *u_event)
873{
51410d3c 874 memset(event, 0, sizeof(*event));
1da177e4
LT		 875 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
876 __get_user(event->sigev_value.sival_int,
877 &u_event->sigev_value.sival_int) ||
878 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
879 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
880 __get_user(event->sigev_notify_thread_id,
881 &u_event->sigev_notify_thread_id))
882 ? -EFAULT : 0;
883}
884
5fa3839a 885long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 886 unsigned long bitmap_size)
887{
888 int i, j;
889 unsigned long m;
890 compat_ulong_t um;
891 unsigned long nr_compat_longs;
892
893 /* align bitmap up to nearest compat_long_t boundary */
894 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
895
896 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
897 return -EFAULT;
898
899 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
900
901 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
902 m = 0;
903
904 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
905 /*
906 * We dont want to read past the end of the userspace
907 * bitmap. We must however ensure the end of the
908 * kernel bitmap is zeroed.
909 */
910 if (nr_compat_longs-- > 0) {
911 if (__get_user(um, umask))
912 return -EFAULT;
913 } else {
914 um = 0;
915 }
916
917 umask++;
918 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
919 }
920 *mask++ = m;
921 }
922
923 return 0;
924}
925
926long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
927 unsigned long bitmap_size)
928{
929 int i, j;
930 unsigned long m;
931 compat_ulong_t um;
932 unsigned long nr_compat_longs;
933
934 /* align bitmap up to nearest compat_long_t boundary */
935 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
936
937 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
938 return -EFAULT;
939
940 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
941
942 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
943 m = *mask++;
944
945 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
946 um = m;
947
948 /*
949 * We dont want to write past the end of the userspace
950 * bitmap.
951 */
952 if (nr_compat_longs-- > 0) {
953 if (__put_user(um, umask))
954 return -EFAULT;
955 }
956
957 umask++;
958 m >>= 4*sizeof(um);
959 m >>= 4*sizeof(um);
960 }
961 }
962
963 return 0;
964}
965
966void
967sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
968{
969 switch (_NSIG_WORDS) {
1da177e4
LT		 970 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
971 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
972 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
973 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 974 }
975}
1dda606c 976EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4
LT		 977
978asmlinkage long
979compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
980 struct compat_siginfo __user *uinfo,
981 struct compat_timespec __user *uts, compat_size_t sigsetsize)
982{
983 compat_sigset_t s32;
984 sigset_t s;
1da177e4
LT		 985 struct timespec t;
986 siginfo_t info;
943df148 987 long ret;
1da177e4
LT		 988
989 if (sigsetsize != sizeof(sigset_t))
990 return -EINVAL;
991
992 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
993 return -EFAULT;
994 sigset_from_compat(&s, &s32);
1da177e4
LT		 995
996 if (uts) {
943df148 997 if (get_compat_timespec(&t, uts))
1da177e4 998 return -EFAULT;
1da177e4
LT		 999 }
1000
943df148 1001 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 1002
943df148
ON		 1003 if (ret > 0 && uinfo) {
1004 if (copy_siginfo_to_user32(uinfo, &info))
1005 ret = -EFAULT;
1da177e4 1006 }
943df148 1007
1da177e4
LT		 1008 return ret;
1009
1010}
1011
62ab4505
TG		 1012asmlinkage long
1013compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
1014 struct compat_siginfo __user *uinfo)
1015{
1016 siginfo_t info;
1017
1018 if (copy_siginfo_from_user32(&info, uinfo))
1019 return -EFAULT;
1020 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
1021}
1022
1da177e4
LT		 1023#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1024
1025/* compat_time_t is a 32 bit "long" and needs to get converted. */
1026
1027asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1028{
1029 compat_time_t i;
1030 struct timeval tv;
1031
1032 do_gettimeofday(&tv);
1033 i = tv.tv_sec;
1034
1035 if (tloc) {
1036 if (put_user(i,tloc))
e3d5a27d 1037 return -EFAULT;
1da177e4 1038 }
e3d5a27d 1039 force_successful_syscall_return();
1da177e4
LT		 1040 return i;
1041}
1042
1043asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1044{
1045 struct timespec tv;
1046 int err;
1047
1048 if (get_user(tv.tv_sec, tptr))
1049 return -EFAULT;
1050
1051 tv.tv_nsec = 0;
1052
1053 err = security_settime(&tv, NULL);
1054 if (err)
1055 return err;
1056
1057 do_settimeofday(&tv);
1058 return 0;
1059}
1060
1061#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 1062
1063#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1064asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1065{
1066 sigset_t newset;
1067 compat_sigset_t newset32;
1068
1069 /* XXX: Don't preclude handling different sized sigset_t's. */
1070 if (sigsetsize != sizeof(sigset_t))
1071 return -EINVAL;
1072
1073 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1074 return -EFAULT;
1075 sigset_from_compat(&newset, &newset32);
68f3f16d 1076 return sigsuspend(&newset);
150256d8
DW		 1077}
1078#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 1079
1080asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1081{
1082 struct timex txc;
65f5d80b 1083 int err, ret;
3158e941 1084
65f5d80b
RC		 1085 err = compat_get_timex(&txc, utp);
1086 if (err)
1087 return err;
3158e941
SR		 1088
1089 ret = do_adjtimex(&txc);
1090
65f5d80b
RC		 1091 err = compat_put_timex(utp, &txc);
1092 if (err)
1093 return err;
3158e941
SR		 1094
1095 return ret;
1096}
1b2db9fb
CL		 1097
1098#ifdef CONFIG_NUMA
1099asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1100 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1101 const int __user *nodes,
1102 int __user *status,
1103 int flags)
1104{
1105 const void __user * __user *pages;
1106 int i;
1107
1108 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1109 for (i = 0; i < nr_pages; i++) {
1110 compat_uptr_t p;
1111
9216dfad 1112 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1113 put_user(compat_ptr(p), pages + i))
1114 return -EFAULT;
1115 }
1116 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1117}
3fd59397
SR		 1118
1119asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1120 compat_ulong_t maxnode,
1121 const compat_ulong_t __user *old_nodes,
1122 const compat_ulong_t __user *new_nodes)
1123{
1124 unsigned long __user *old = NULL;
1125 unsigned long __user *new = NULL;
1126 nodemask_t tmp_mask;
1127 unsigned long nr_bits;
1128 unsigned long size;
1129
1130 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1131 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1132 if (old_nodes) {
1133 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1134 return -EFAULT;
1135 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1136 if (new_nodes)
1137 new = old + size / sizeof(unsigned long);
1138 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1139 return -EFAULT;
1140 }
1141 if (new_nodes) {
1142 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1143 return -EFAULT;
1144 if (new == NULL)
1145 new = compat_alloc_user_space(size);
1146 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1147 return -EFAULT;
1148 }
1149 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1150}
1b2db9fb 1151#endif
d4d23add
KM		 1152
1153struct compat_sysinfo {
1154 s32 uptime;
1155 u32 loads[3];
1156 u32 totalram;
1157 u32 freeram;
1158 u32 sharedram;
1159 u32 bufferram;
1160 u32 totalswap;
1161 u32 freeswap;
1162 u16 procs;
1163 u16 pad;
1164 u32 totalhigh;
1165 u32 freehigh;
1166 u32 mem_unit;
1167 char _f[20-2*sizeof(u32)-sizeof(int)];
1168};
1169
1170asmlinkage long
1171compat_sys_sysinfo(struct compat_sysinfo __user *info)
1172{
1173 struct sysinfo s;
1174
1175 do_sysinfo(&s);
1176
1177 /* Check to see if any memory value is too large for 32-bit and scale
1178 * down if needed
1179 */
1180 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1181 int bitcount = 0;
1182
1183 while (s.mem_unit < PAGE_SIZE) {
1184 s.mem_unit <<= 1;
1185 bitcount++;
1186 }
1187
1188 s.totalram >>= bitcount;
1189 s.freeram >>= bitcount;
1190 s.sharedram >>= bitcount;
1191 s.bufferram >>= bitcount;
1192 s.totalswap >>= bitcount;
1193 s.freeswap >>= bitcount;
1194 s.totalhigh >>= bitcount;
1195 s.freehigh >>= bitcount;
1196 }
1197
1198 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1199 __put_user (s.uptime, &info->uptime) ||
1200 __put_user (s.loads[0], &info->loads[0]) ||
1201 __put_user (s.loads[1], &info->loads[1]) ||
1202 __put_user (s.loads[2], &info->loads[2]) ||
1203 __put_user (s.totalram, &info->totalram) ||
1204 __put_user (s.freeram, &info->freeram) ||
1205 __put_user (s.sharedram, &info->sharedram) ||
1206 __put_user (s.bufferram, &info->bufferram) ||
1207 __put_user (s.totalswap, &info->totalswap) ||
1208 __put_user (s.freeswap, &info->freeswap) ||
1209 __put_user (s.procs, &info->procs) ||
1210 __put_user (s.totalhigh, &info->totalhigh) ||
1211 __put_user (s.freehigh, &info->freehigh) ||
1212 __put_user (s.mem_unit, &info->mem_unit))
1213 return -EFAULT;
1214
1215 return 0;
1216}
c41d68a5 1217
0ad50c38
CM		 1218#ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
1219asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
1220 struct compat_timespec __user *interval)
1221{
1222 struct timespec t;
1223 int ret;
1224 mm_segment_t old_fs = get_fs();
1225
1226 set_fs(KERNEL_DS);
1227 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1228 set_fs(old_fs);
1229 if (put_compat_timespec(&t, interval))
1230 return -EFAULT;
1231 return ret;
1232}
1233#endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */
1234
c41d68a5
PA		 1235/*
1236 * Allocate user-space memory for the duration of a single system call,
1237 * in order to marshall parameters inside a compat thunk.
1238 */
1239void __user *compat_alloc_user_space(unsigned long len)
1240{
1241 void __user *ptr;
1242
1243 /* If len would occupy more than half of the entire compat space... */
1244 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1245 return NULL;
1246
1247 ptr = arch_compat_alloc_user_space(len);
1248
1249 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1250 return NULL;
1251
1252 return ptr;
1253}
1254EXPORT_SYMBOL_GPL(compat_alloc_user_space);
ubuntu-zesty-kernel mirror