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kernel: fix up module header handling in rcutiny files
[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>
1b2db9fb 24#include <linux/migrate.h>
1711ef38 25#include <linux/posix-timers.h>
f06febc9 26#include <linux/times.h>
e3d5a27d 27#include <linux/ptrace.h>
5a0e3ad6 28#include <linux/gfp.h>
1da177e4
LT		 29
30#include <asm/uaccess.h>
1da177e4 31
b418da16
CH		 32/*
33 * Note that the native side is already converted to a timespec, because
34 * that's what we want anyway.
35 */
36static int compat_get_timeval(struct timespec *o,
37 struct compat_timeval __user *i)
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
48static int compat_put_timeval(struct compat_timeval __user *o,
49 struct timeval *i)
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);
119 if (compat_put_timeval(tv, &ktv))
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) {
137 if (compat_get_timeval(&kts, tv))
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
1da177e4
LT		 148int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
149{
150 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
151 __get_user(ts->tv_sec, &cts->tv_sec) ||
152 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
153}
154
155int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
156{
157 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
158 __put_user(ts->tv_sec, &cts->tv_sec) ||
159 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
160}
2330fb82 161EXPORT_SYMBOL_GPL(put_compat_timespec);
1da177e4 162
41652937
ON		 163static long compat_nanosleep_restart(struct restart_block *restart)
164{
165 struct compat_timespec __user *rmtp;
166 struct timespec rmt;
167 mm_segment_t oldfs;
168 long ret;
169
029a07e0 170 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 171 oldfs = get_fs();
172 set_fs(KERNEL_DS);
173 ret = hrtimer_nanosleep_restart(restart);
174 set_fs(oldfs);
175
176 if (ret) {
029a07e0 177 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 178
179 if (rmtp && put_compat_timespec(&rmt, rmtp))
180 return -EFAULT;
181 }
182
183 return ret;
184}
185
1da177e4 186asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 187 struct compat_timespec __user *rmtp)
1da177e4 188{
c70878b4 189 struct timespec tu, rmt;
41652937 190 mm_segment_t oldfs;
c70878b4 191 long ret;
1da177e4 192
c70878b4 193 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 194 return -EFAULT;
195
c70878b4 196 if (!timespec_valid(&tu))
1da177e4
LT		 197 return -EINVAL;
198
41652937
ON		 199 oldfs = get_fs();
200 set_fs(KERNEL_DS);
201 ret = hrtimer_nanosleep(&tu,
202 rmtp ? (struct timespec __user *)&rmt : NULL,
203 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
204 set_fs(oldfs);
205
206 if (ret) {
207 struct restart_block *restart
208 = &current_thread_info()->restart_block;
209
210 restart->fn = compat_nanosleep_restart;
029a07e0 211 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 212
41652937 213 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 214 return -EFAULT;
215 }
c70878b4
AB		 216
217 return ret;
1da177e4
LT		 218}
219
220static inline long get_compat_itimerval(struct itimerval *o,
221 struct compat_itimerval __user *i)
222{
223 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
224 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
225 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
226 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
227 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
228}
229
230static inline long put_compat_itimerval(struct compat_itimerval __user *o,
231 struct itimerval *i)
232{
233 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
234 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
235 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
236 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
237 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
238}
239
240asmlinkage long compat_sys_getitimer(int which,
241 struct compat_itimerval __user *it)
242{
243 struct itimerval kit;
244 int error;
245
246 error = do_getitimer(which, &kit);
247 if (!error && put_compat_itimerval(it, &kit))
248 error = -EFAULT;
249 return error;
250}
251
252asmlinkage long compat_sys_setitimer(int which,
253 struct compat_itimerval __user *in,
254 struct compat_itimerval __user *out)
255{
256 struct itimerval kin, kout;
257 int error;
258
259 if (in) {
260 if (get_compat_itimerval(&kin, in))
261 return -EFAULT;
262 } else
263 memset(&kin, 0, sizeof(kin));
264
265 error = do_setitimer(which, &kin, out ? &kout : NULL);
266 if (error || !out)
267 return error;
268 if (put_compat_itimerval(out, &kout))
269 return -EFAULT;
270 return 0;
271}
272
f06febc9
FM		 273static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
274{
275 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
276}
277
1da177e4
LT		 278asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
279{
1da177e4 280 if (tbuf) {
f06febc9 281 struct tms tms;
1da177e4 282 struct compat_tms tmp;
f06febc9
FM		 283
284 do_sys_times(&tms);
285 /* Convert our struct tms to the compat version. */
286 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
287 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
288 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
289 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 290 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
291 return -EFAULT;
292 }
e3d5a27d 293 force_successful_syscall_return();
1da177e4
LT		 294 return compat_jiffies_to_clock_t(jiffies);
295}
296
be84cb43
CM		 297#ifdef __ARCH_WANT_SYS_SIGPENDING
298
1da177e4
LT		 299/*
300 * Assumption: old_sigset_t and compat_old_sigset_t are both
301 * types that can be passed to put_user()/get_user().
302 */
303
304asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
305{
306 old_sigset_t s;
307 long ret;
308 mm_segment_t old_fs = get_fs();
309
310 set_fs(KERNEL_DS);
311 ret = sys_sigpending((old_sigset_t __user *) &s);
312 set_fs(old_fs);
313 if (ret == 0)
314 ret = put_user(s, set);
315 return ret;
316}
317
be84cb43
CM		 318#endif
319
320#ifdef __ARCH_WANT_SYS_SIGPROCMASK
321
1da177e4
LT		 322asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
323 compat_old_sigset_t __user *oset)
324{
325 old_sigset_t s;
326 long ret;
327 mm_segment_t old_fs;
328
329 if (set && get_user(s, set))
330 return -EFAULT;
331 old_fs = get_fs();
332 set_fs(KERNEL_DS);
333 ret = sys_sigprocmask(how,
334 set ? (old_sigset_t __user *) &s : NULL,
335 oset ? (old_sigset_t __user *) &s : NULL);
336 set_fs(old_fs);
337 if (ret == 0)
338 if (oset)
339 ret = put_user(s, oset);
340 return ret;
341}
342
be84cb43
CM		 343#endif
344
1da177e4
LT		 345asmlinkage long compat_sys_setrlimit(unsigned int resource,
346 struct compat_rlimit __user *rlim)
347{
348 struct rlimit r;
1da177e4
LT		 349
350 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
351 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
352 __get_user(r.rlim_max, &rlim->rlim_max))
353 return -EFAULT;
354
355 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
356 r.rlim_cur = RLIM_INFINITY;
357 if (r.rlim_max == COMPAT_RLIM_INFINITY)
358 r.rlim_max = RLIM_INFINITY;
b9518345 359 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 360}
361
362#ifdef COMPAT_RLIM_OLD_INFINITY
363
364asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
365 struct compat_rlimit __user *rlim)
366{
367 struct rlimit r;
368 int ret;
369 mm_segment_t old_fs = get_fs();
370
371 set_fs(KERNEL_DS);
372 ret = sys_old_getrlimit(resource, &r);
373 set_fs(old_fs);
374
375 if (!ret) {
376 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
377 r.rlim_cur = COMPAT_RLIM_INFINITY;
378 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
379 r.rlim_max = COMPAT_RLIM_INFINITY;
380
381 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
382 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
383 __put_user(r.rlim_max, &rlim->rlim_max))
384 return -EFAULT;
385 }
386 return ret;
387}
388
389#endif
390
b9518345 391asmlinkage long compat_sys_getrlimit(unsigned int resource,
1da177e4
LT		 392 struct compat_rlimit __user *rlim)
393{
394 struct rlimit r;
395 int ret;
1da177e4 396
b9518345 397 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 398 if (!ret) {
399 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
400 r.rlim_cur = COMPAT_RLIM_INFINITY;
401 if (r.rlim_max > COMPAT_RLIM_INFINITY)
402 r.rlim_max = COMPAT_RLIM_INFINITY;
403
404 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
405 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
406 __put_user(r.rlim_max, &rlim->rlim_max))
407 return -EFAULT;
408 }
409 return ret;
410}
411
412int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
413{
414 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
415 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
416 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
417 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
418 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
419 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
420 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
421 __put_user(r->ru_idrss, &ru->ru_idrss) ||
422 __put_user(r->ru_isrss, &ru->ru_isrss) ||
423 __put_user(r->ru_minflt, &ru->ru_minflt) ||
424 __put_user(r->ru_majflt, &ru->ru_majflt) ||
425 __put_user(r->ru_nswap, &ru->ru_nswap) ||
426 __put_user(r->ru_inblock, &ru->ru_inblock) ||
427 __put_user(r->ru_oublock, &ru->ru_oublock) ||
428 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
429 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
430 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
431 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
432 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
433 return -EFAULT;
434 return 0;
435}
436
437asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
438{
439 struct rusage r;
440 int ret;
441 mm_segment_t old_fs = get_fs();
442
443 set_fs(KERNEL_DS);
444 ret = sys_getrusage(who, (struct rusage __user *) &r);
445 set_fs(old_fs);
446
447 if (ret)
448 return ret;
449
450 if (put_compat_rusage(&r, ru))
451 return -EFAULT;
452
453 return 0;
454}
455
456asmlinkage long
457compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
458 struct compat_rusage __user *ru)
459{
460 if (!ru) {
461 return sys_wait4(pid, stat_addr, options, NULL);
462 } else {
463 struct rusage r;
464 int ret;
465 unsigned int status;
466 mm_segment_t old_fs = get_fs();
467
468 set_fs (KERNEL_DS);
469 ret = sys_wait4(pid,
470 (stat_addr ?
471 (unsigned int __user *) &status : NULL),
472 options, (struct rusage __user *) &r);
473 set_fs (old_fs);
474
475 if (ret > 0) {
476 if (put_compat_rusage(&r, ru))
477 return -EFAULT;
478 if (stat_addr && put_user(status, stat_addr))
479 return -EFAULT;
480 }
481 return ret;
482 }
483}
484
485asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
486 struct compat_siginfo __user *uinfo, int options,
487 struct compat_rusage __user *uru)
488{
489 siginfo_t info;
490 struct rusage ru;
491 long ret;
492 mm_segment_t old_fs = get_fs();
493
494 memset(&info, 0, sizeof(info));
495
496 set_fs(KERNEL_DS);
497 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
498 uru ? (struct rusage __user *)&ru : NULL);
499 set_fs(old_fs);
500
501 if ((ret < 0) || (info.si_signo == 0))
502 return ret;
503
504 if (uru) {
505 ret = put_compat_rusage(&ru, uru);
506 if (ret)
507 return ret;
508 }
509
510 BUG_ON(info.si_code & __SI_MASK);
511 info.si_code |= __SI_CHLD;
512 return copy_siginfo_to_user32(uinfo, &info);
513}
514
515static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 516 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 517{
518 unsigned long *k;
519
a45185d2
RR		 520 if (len < cpumask_size())
521 memset(new_mask, 0, cpumask_size());
522 else if (len > cpumask_size())
523 len = cpumask_size();
1da177e4 524
a45185d2 525 k = cpumask_bits(new_mask);
1da177e4
LT		 526 return compat_get_bitmap(k, user_mask_ptr, len * 8);
527}
528
529asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
530 unsigned int len,
531 compat_ulong_t __user *user_mask_ptr)
532{
a45185d2 533 cpumask_var_t new_mask;
1da177e4
LT		 534 int retval;
535
a45185d2
RR		 536 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
537 return -ENOMEM;
538
539 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 540 if (retval)
a45185d2 541 goto out;
1da177e4 542
a45185d2
RR		 543 retval = sched_setaffinity(pid, new_mask);
544out:
545 free_cpumask_var(new_mask);
546 return retval;
1da177e4
LT		 547}
548
549asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
550 compat_ulong_t __user *user_mask_ptr)
551{
552 int ret;
a45185d2 553 cpumask_var_t mask;
1da177e4 554
fa9dc265
KM		 555 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
556 return -EINVAL;
557 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 558 return -EINVAL;
559
a45185d2
RR		 560 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
561 return -ENOMEM;
562
563 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 564 if (ret == 0) {
565 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 566
fa9dc265
KM		 567 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
568 ret = -EFAULT;
569 else
570 ret = retlen;
571 }
a45185d2 572 free_cpumask_var(mask);
fa9dc265 573
a45185d2 574 return ret;
1da177e4
LT		 575}
576
83f5d126
DL		 577int get_compat_itimerspec(struct itimerspec *dst,
578 const struct compat_itimerspec __user *src)
bd3a8492 579{
1da177e4
LT		 580 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
581 get_compat_timespec(&dst->it_value, &src->it_value))
582 return -EFAULT;
583 return 0;
bd3a8492 584}
1da177e4 585
83f5d126
DL		 586int put_compat_itimerspec(struct compat_itimerspec __user *dst,
587 const struct itimerspec *src)
bd3a8492 588{
1da177e4
LT		 589 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
590 put_compat_timespec(&src->it_value, &dst->it_value))
591 return -EFAULT;
592 return 0;
bd3a8492 593}
1da177e4 594
3a0f69d5
CH		 595long compat_sys_timer_create(clockid_t which_clock,
596 struct compat_sigevent __user *timer_event_spec,
597 timer_t __user *created_timer_id)
598{
599 struct sigevent __user *event = NULL;
600
601 if (timer_event_spec) {
602 struct sigevent kevent;
603
604 event = compat_alloc_user_space(sizeof(*event));
605 if (get_compat_sigevent(&kevent, timer_event_spec) ||
606 copy_to_user(event, &kevent, sizeof(*event)))
607 return -EFAULT;
608 }
609
610 return sys_timer_create(which_clock, event, created_timer_id);
611}
612
1da177e4 613long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 614 struct compat_itimerspec __user *new,
1da177e4 615 struct compat_itimerspec __user *old)
bd3a8492 616{
1da177e4
LT		 617 long err;
618 mm_segment_t oldfs;
619 struct itimerspec newts, oldts;
620
621 if (!new)
622 return -EINVAL;
623 if (get_compat_itimerspec(&newts, new))
bd3a8492 624 return -EFAULT;
1da177e4
LT		 625 oldfs = get_fs();
626 set_fs(KERNEL_DS);
627 err = sys_timer_settime(timer_id, flags,
628 (struct itimerspec __user *) &newts,
629 (struct itimerspec __user *) &oldts);
bd3a8492 630 set_fs(oldfs);
1da177e4
LT		 631 if (!err && old && put_compat_itimerspec(old, &oldts))
632 return -EFAULT;
633 return err;
bd3a8492 634}
1da177e4
LT		 635
636long compat_sys_timer_gettime(timer_t timer_id,
637 struct compat_itimerspec __user *setting)
bd3a8492 638{
1da177e4
LT		 639 long err;
640 mm_segment_t oldfs;
bd3a8492 641 struct itimerspec ts;
1da177e4
LT		 642
643 oldfs = get_fs();
644 set_fs(KERNEL_DS);
645 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 646 (struct itimerspec __user *) &ts);
647 set_fs(oldfs);
1da177e4
LT		 648 if (!err && put_compat_itimerspec(setting, &ts))
649 return -EFAULT;
650 return err;
bd3a8492 651}
1da177e4
LT		 652
653long compat_sys_clock_settime(clockid_t which_clock,
654 struct compat_timespec __user *tp)
655{
656 long err;
657 mm_segment_t oldfs;
bd3a8492 658 struct timespec ts;
1da177e4
LT		 659
660 if (get_compat_timespec(&ts, tp))
bd3a8492 661 return -EFAULT;
1da177e4 662 oldfs = get_fs();
bd3a8492 663 set_fs(KERNEL_DS);
1da177e4
LT		 664 err = sys_clock_settime(which_clock,
665 (struct timespec __user *) &ts);
666 set_fs(oldfs);
667 return err;
bd3a8492 668}
1da177e4
LT		 669
670long compat_sys_clock_gettime(clockid_t which_clock,
671 struct compat_timespec __user *tp)
672{
673 long err;
674 mm_segment_t oldfs;
bd3a8492 675 struct timespec ts;
1da177e4
LT		 676
677 oldfs = get_fs();
678 set_fs(KERNEL_DS);
679 err = sys_clock_gettime(which_clock,
680 (struct timespec __user *) &ts);
681 set_fs(oldfs);
682 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 683 return -EFAULT;
1da177e4 684 return err;
bd3a8492 685}
1da177e4 686
f1f1d5eb
RC		 687long compat_sys_clock_adjtime(clockid_t which_clock,
688 struct compat_timex __user *utp)
689{
690 struct timex txc;
691 mm_segment_t oldfs;
692 int err, ret;
693
694 err = compat_get_timex(&txc, utp);
695 if (err)
696 return err;
697
698 oldfs = get_fs();
699 set_fs(KERNEL_DS);
700 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
701 set_fs(oldfs);
702
703 err = compat_put_timex(utp, &txc);
704 if (err)
705 return err;
706
707 return ret;
708}
709
1da177e4
LT		 710long compat_sys_clock_getres(clockid_t which_clock,
711 struct compat_timespec __user *tp)
712{
713 long err;
714 mm_segment_t oldfs;
bd3a8492 715 struct timespec ts;
1da177e4
LT		 716
717 oldfs = get_fs();
718 set_fs(KERNEL_DS);
719 err = sys_clock_getres(which_clock,
720 (struct timespec __user *) &ts);
721 set_fs(oldfs);
722 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 723 return -EFAULT;
1da177e4 724 return err;
bd3a8492 725}
1da177e4 726
1711ef38
TA		 727static long compat_clock_nanosleep_restart(struct restart_block *restart)
728{
729 long err;
730 mm_segment_t oldfs;
731 struct timespec tu;
029a07e0 732 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 733
029a07e0 734 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 735 oldfs = get_fs();
736 set_fs(KERNEL_DS);
737 err = clock_nanosleep_restart(restart);
738 set_fs(oldfs);
739
740 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
741 put_compat_timespec(&tu, rmtp))
742 return -EFAULT;
743
744 if (err == -ERESTART_RESTARTBLOCK) {
745 restart->fn = compat_clock_nanosleep_restart;
029a07e0 746 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 747 }
748 return err;
749}
750
1da177e4
LT		 751long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
752 struct compat_timespec __user *rqtp,
753 struct compat_timespec __user *rmtp)
754{
755 long err;
756 mm_segment_t oldfs;
bd3a8492 757 struct timespec in, out;
1711ef38 758 struct restart_block *restart;
1da177e4 759
bd3a8492 760 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 761 return -EFAULT;
762
763 oldfs = get_fs();
764 set_fs(KERNEL_DS);
765 err = sys_clock_nanosleep(which_clock, flags,
766 (struct timespec __user *) &in,
767 (struct timespec __user *) &out);
768 set_fs(oldfs);
1711ef38 769
1da177e4
LT		 770 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
771 put_compat_timespec(&out, rmtp))
772 return -EFAULT;
1711ef38
TA		 773
774 if (err == -ERESTART_RESTARTBLOCK) {
775 restart = &current_thread_info()->restart_block;
776 restart->fn = compat_clock_nanosleep_restart;
029a07e0 777 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 778 }
bd3a8492
DW		 779 return err;
780}
1da177e4
LT		 781
782/*
783 * We currently only need the following fields from the sigevent
784 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
785 * sigev_notify_thread_id). The others are handled in user mode.
786 * We also assume that copying sigev_value.sival_int is sufficient
787 * to keep all the bits of sigev_value.sival_ptr intact.
788 */
789int get_compat_sigevent(struct sigevent *event,
790 const struct compat_sigevent __user *u_event)
791{
51410d3c 792 memset(event, 0, sizeof(*event));
1da177e4
LT		 793 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
794 __get_user(event->sigev_value.sival_int,
795 &u_event->sigev_value.sival_int) ||
796 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
797 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
798 __get_user(event->sigev_notify_thread_id,
799 &u_event->sigev_notify_thread_id))
800 ? -EFAULT : 0;
801}
802
5fa3839a 803long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 804 unsigned long bitmap_size)
805{
806 int i, j;
807 unsigned long m;
808 compat_ulong_t um;
809 unsigned long nr_compat_longs;
810
811 /* align bitmap up to nearest compat_long_t boundary */
812 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
813
814 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
815 return -EFAULT;
816
817 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
818
819 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
820 m = 0;
821
822 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
823 /*
824 * We dont want to read past the end of the userspace
825 * bitmap. We must however ensure the end of the
826 * kernel bitmap is zeroed.
827 */
828 if (nr_compat_longs-- > 0) {
829 if (__get_user(um, umask))
830 return -EFAULT;
831 } else {
832 um = 0;
833 }
834
835 umask++;
836 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
837 }
838 *mask++ = m;
839 }
840
841 return 0;
842}
843
844long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
845 unsigned long bitmap_size)
846{
847 int i, j;
848 unsigned long m;
849 compat_ulong_t um;
850 unsigned long nr_compat_longs;
851
852 /* align bitmap up to nearest compat_long_t boundary */
853 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
854
855 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
856 return -EFAULT;
857
858 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
859
860 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
861 m = *mask++;
862
863 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
864 um = m;
865
866 /*
867 * We dont want to write past the end of the userspace
868 * bitmap.
869 */
870 if (nr_compat_longs-- > 0) {
871 if (__put_user(um, umask))
872 return -EFAULT;
873 }
874
875 umask++;
876 m >>= 4*sizeof(um);
877 m >>= 4*sizeof(um);
878 }
879 }
880
881 return 0;
882}
883
884void
885sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
886{
887 switch (_NSIG_WORDS) {
1da177e4
LT		 888 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
889 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
890 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
891 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 892 }
893}
1dda606c 894EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4
LT		 895
896asmlinkage long
897compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
898 struct compat_siginfo __user *uinfo,
899 struct compat_timespec __user *uts, compat_size_t sigsetsize)
900{
901 compat_sigset_t s32;
902 sigset_t s;
1da177e4
LT		 903 struct timespec t;
904 siginfo_t info;
943df148 905 long ret;
1da177e4
LT		 906
907 if (sigsetsize != sizeof(sigset_t))
908 return -EINVAL;
909
910 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
911 return -EFAULT;
912 sigset_from_compat(&s, &s32);
1da177e4
LT		 913
914 if (uts) {
943df148 915 if (get_compat_timespec(&t, uts))
1da177e4 916 return -EFAULT;
1da177e4
LT		 917 }
918
943df148 919 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 920
943df148
ON		 921 if (ret > 0 && uinfo) {
922 if (copy_siginfo_to_user32(uinfo, &info))
923 ret = -EFAULT;
1da177e4 924 }
943df148 925
1da177e4
LT		 926 return ret;
927
928}
929
62ab4505
TG		 930asmlinkage long
931compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
932 struct compat_siginfo __user *uinfo)
933{
934 siginfo_t info;
935
936 if (copy_siginfo_from_user32(&info, uinfo))
937 return -EFAULT;
938 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
939}
940
1da177e4
LT		 941#ifdef __ARCH_WANT_COMPAT_SYS_TIME
942
943/* compat_time_t is a 32 bit "long" and needs to get converted. */
944
945asmlinkage long compat_sys_time(compat_time_t __user * tloc)
946{
947 compat_time_t i;
948 struct timeval tv;
949
950 do_gettimeofday(&tv);
951 i = tv.tv_sec;
952
953 if (tloc) {
954 if (put_user(i,tloc))
e3d5a27d 955 return -EFAULT;
1da177e4 956 }
e3d5a27d 957 force_successful_syscall_return();
1da177e4
LT		 958 return i;
959}
960
961asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
962{
963 struct timespec tv;
964 int err;
965
966 if (get_user(tv.tv_sec, tptr))
967 return -EFAULT;
968
969 tv.tv_nsec = 0;
970
971 err = security_settime(&tv, NULL);
972 if (err)
973 return err;
974
975 do_settimeofday(&tv);
976 return 0;
977}
978
979#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 980
981#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
982asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
983{
984 sigset_t newset;
985 compat_sigset_t newset32;
986
987 /* XXX: Don't preclude handling different sized sigset_t's. */
988 if (sigsetsize != sizeof(sigset_t))
989 return -EINVAL;
990
991 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
992 return -EFAULT;
993 sigset_from_compat(&newset, &newset32);
994 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
995
150256d8 996 current->saved_sigmask = current->blocked;
c1095c6d 997 set_current_blocked(&newset);
150256d8
DW		 998
999 current->state = TASK_INTERRUPTIBLE;
1000 schedule();
4e4c22c7 1001 set_restore_sigmask();
150256d8
DW		 1002 return -ERESTARTNOHAND;
1003}
1004#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 1005
1006asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1007{
1008 struct timex txc;
65f5d80b 1009 int err, ret;
3158e941 1010
65f5d80b
RC		 1011 err = compat_get_timex(&txc, utp);
1012 if (err)
1013 return err;
3158e941
SR		 1014
1015 ret = do_adjtimex(&txc);
1016
65f5d80b
RC		 1017 err = compat_put_timex(utp, &txc);
1018 if (err)
1019 return err;
3158e941
SR		 1020
1021 return ret;
1022}
1b2db9fb
CL		 1023
1024#ifdef CONFIG_NUMA
1025asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1026 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1027 const int __user *nodes,
1028 int __user *status,
1029 int flags)
1030{
1031 const void __user * __user *pages;
1032 int i;
1033
1034 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1035 for (i = 0; i < nr_pages; i++) {
1036 compat_uptr_t p;
1037
9216dfad 1038 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1039 put_user(compat_ptr(p), pages + i))
1040 return -EFAULT;
1041 }
1042 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1043}
3fd59397
SR		 1044
1045asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1046 compat_ulong_t maxnode,
1047 const compat_ulong_t __user *old_nodes,
1048 const compat_ulong_t __user *new_nodes)
1049{
1050 unsigned long __user *old = NULL;
1051 unsigned long __user *new = NULL;
1052 nodemask_t tmp_mask;
1053 unsigned long nr_bits;
1054 unsigned long size;
1055
1056 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1057 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1058 if (old_nodes) {
1059 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1060 return -EFAULT;
1061 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1062 if (new_nodes)
1063 new = old + size / sizeof(unsigned long);
1064 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1065 return -EFAULT;
1066 }
1067 if (new_nodes) {
1068 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1069 return -EFAULT;
1070 if (new == NULL)
1071 new = compat_alloc_user_space(size);
1072 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1073 return -EFAULT;
1074 }
1075 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1076}
1b2db9fb 1077#endif
d4d23add
KM		 1078
1079struct compat_sysinfo {
1080 s32 uptime;
1081 u32 loads[3];
1082 u32 totalram;
1083 u32 freeram;
1084 u32 sharedram;
1085 u32 bufferram;
1086 u32 totalswap;
1087 u32 freeswap;
1088 u16 procs;
1089 u16 pad;
1090 u32 totalhigh;
1091 u32 freehigh;
1092 u32 mem_unit;
1093 char _f[20-2*sizeof(u32)-sizeof(int)];
1094};
1095
1096asmlinkage long
1097compat_sys_sysinfo(struct compat_sysinfo __user *info)
1098{
1099 struct sysinfo s;
1100
1101 do_sysinfo(&s);
1102
1103 /* Check to see if any memory value is too large for 32-bit and scale
1104 * down if needed
1105 */
1106 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1107 int bitcount = 0;
1108
1109 while (s.mem_unit < PAGE_SIZE) {
1110 s.mem_unit <<= 1;
1111 bitcount++;
1112 }
1113
1114 s.totalram >>= bitcount;
1115 s.freeram >>= bitcount;
1116 s.sharedram >>= bitcount;
1117 s.bufferram >>= bitcount;
1118 s.totalswap >>= bitcount;
1119 s.freeswap >>= bitcount;
1120 s.totalhigh >>= bitcount;
1121 s.freehigh >>= bitcount;
1122 }
1123
1124 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1125 __put_user (s.uptime, &info->uptime) ||
1126 __put_user (s.loads[0], &info->loads[0]) ||
1127 __put_user (s.loads[1], &info->loads[1]) ||
1128 __put_user (s.loads[2], &info->loads[2]) ||
1129 __put_user (s.totalram, &info->totalram) ||
1130 __put_user (s.freeram, &info->freeram) ||
1131 __put_user (s.sharedram, &info->sharedram) ||
1132 __put_user (s.bufferram, &info->bufferram) ||
1133 __put_user (s.totalswap, &info->totalswap) ||
1134 __put_user (s.freeswap, &info->freeswap) ||
1135 __put_user (s.procs, &info->procs) ||
1136 __put_user (s.totalhigh, &info->totalhigh) ||
1137 __put_user (s.freehigh, &info->freehigh) ||
1138 __put_user (s.mem_unit, &info->mem_unit))
1139 return -EFAULT;
1140
1141 return 0;
1142}
c41d68a5
PA		 1143
1144/*
1145 * Allocate user-space memory for the duration of a single system call,
1146 * in order to marshall parameters inside a compat thunk.
1147 */
1148void __user *compat_alloc_user_space(unsigned long len)
1149{
1150 void __user *ptr;
1151
1152 /* If len would occupy more than half of the entire compat space... */
1153 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1154 return NULL;
1155
1156 ptr = arch_compat_alloc_user_space(len);
1157
1158 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1159 return NULL;
1160
1161 return ptr;
1162}
1163EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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