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arch/tile: update defconfig file to something more useful
[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>
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}
161
41652937
ON		 162static long compat_nanosleep_restart(struct restart_block *restart)
163{
164 struct compat_timespec __user *rmtp;
165 struct timespec rmt;
166 mm_segment_t oldfs;
167 long ret;
168
029a07e0 169 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 170 oldfs = get_fs();
171 set_fs(KERNEL_DS);
172 ret = hrtimer_nanosleep_restart(restart);
173 set_fs(oldfs);
174
175 if (ret) {
029a07e0 176 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 177
178 if (rmtp && put_compat_timespec(&rmt, rmtp))
179 return -EFAULT;
180 }
181
182 return ret;
183}
184
1da177e4 185asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 186 struct compat_timespec __user *rmtp)
1da177e4 187{
c70878b4 188 struct timespec tu, rmt;
41652937 189 mm_segment_t oldfs;
c70878b4 190 long ret;
1da177e4 191
c70878b4 192 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 193 return -EFAULT;
194
c70878b4 195 if (!timespec_valid(&tu))
1da177e4
LT		 196 return -EINVAL;
197
41652937
ON		 198 oldfs = get_fs();
199 set_fs(KERNEL_DS);
200 ret = hrtimer_nanosleep(&tu,
201 rmtp ? (struct timespec __user *)&rmt : NULL,
202 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
203 set_fs(oldfs);
204
205 if (ret) {
206 struct restart_block *restart
207 = &current_thread_info()->restart_block;
208
209 restart->fn = compat_nanosleep_restart;
029a07e0 210 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 211
41652937 212 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 213 return -EFAULT;
214 }
c70878b4
AB		 215
216 return ret;
1da177e4
LT		 217}
218
219static inline long get_compat_itimerval(struct itimerval *o,
220 struct compat_itimerval __user *i)
221{
222 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
223 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
224 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
225 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
226 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
227}
228
229static inline long put_compat_itimerval(struct compat_itimerval __user *o,
230 struct itimerval *i)
231{
232 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
233 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
234 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
235 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
236 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
237}
238
239asmlinkage long compat_sys_getitimer(int which,
240 struct compat_itimerval __user *it)
241{
242 struct itimerval kit;
243 int error;
244
245 error = do_getitimer(which, &kit);
246 if (!error && put_compat_itimerval(it, &kit))
247 error = -EFAULT;
248 return error;
249}
250
251asmlinkage long compat_sys_setitimer(int which,
252 struct compat_itimerval __user *in,
253 struct compat_itimerval __user *out)
254{
255 struct itimerval kin, kout;
256 int error;
257
258 if (in) {
259 if (get_compat_itimerval(&kin, in))
260 return -EFAULT;
261 } else
262 memset(&kin, 0, sizeof(kin));
263
264 error = do_setitimer(which, &kin, out ? &kout : NULL);
265 if (error || !out)
266 return error;
267 if (put_compat_itimerval(out, &kout))
268 return -EFAULT;
269 return 0;
270}
271
f06febc9
FM		 272static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
273{
274 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
275}
276
1da177e4
LT		 277asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
278{
1da177e4 279 if (tbuf) {
f06febc9 280 struct tms tms;
1da177e4 281 struct compat_tms tmp;
f06febc9
FM		 282
283 do_sys_times(&tms);
284 /* Convert our struct tms to the compat version. */
285 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
286 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
287 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
288 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1da177e4
LT		 289 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
290 return -EFAULT;
291 }
e3d5a27d 292 force_successful_syscall_return();
1da177e4
LT		 293 return compat_jiffies_to_clock_t(jiffies);
294}
295
296/*
297 * Assumption: old_sigset_t and compat_old_sigset_t are both
298 * types that can be passed to put_user()/get_user().
299 */
300
301asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
302{
303 old_sigset_t s;
304 long ret;
305 mm_segment_t old_fs = get_fs();
306
307 set_fs(KERNEL_DS);
308 ret = sys_sigpending((old_sigset_t __user *) &s);
309 set_fs(old_fs);
310 if (ret == 0)
311 ret = put_user(s, set);
312 return ret;
313}
314
315asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
316 compat_old_sigset_t __user *oset)
317{
318 old_sigset_t s;
319 long ret;
320 mm_segment_t old_fs;
321
322 if (set && get_user(s, set))
323 return -EFAULT;
324 old_fs = get_fs();
325 set_fs(KERNEL_DS);
326 ret = sys_sigprocmask(how,
327 set ? (old_sigset_t __user *) &s : NULL,
328 oset ? (old_sigset_t __user *) &s : NULL);
329 set_fs(old_fs);
330 if (ret == 0)
331 if (oset)
332 ret = put_user(s, oset);
333 return ret;
334}
335
1da177e4
LT		 336asmlinkage long compat_sys_setrlimit(unsigned int resource,
337 struct compat_rlimit __user *rlim)
338{
339 struct rlimit r;
1da177e4
LT		 340
341 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
342 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
343 __get_user(r.rlim_max, &rlim->rlim_max))
344 return -EFAULT;
345
346 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
347 r.rlim_cur = RLIM_INFINITY;
348 if (r.rlim_max == COMPAT_RLIM_INFINITY)
349 r.rlim_max = RLIM_INFINITY;
b9518345 350 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 351}
352
353#ifdef COMPAT_RLIM_OLD_INFINITY
354
355asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
356 struct compat_rlimit __user *rlim)
357{
358 struct rlimit r;
359 int ret;
360 mm_segment_t old_fs = get_fs();
361
362 set_fs(KERNEL_DS);
363 ret = sys_old_getrlimit(resource, &r);
364 set_fs(old_fs);
365
366 if (!ret) {
367 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
368 r.rlim_cur = COMPAT_RLIM_INFINITY;
369 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
370 r.rlim_max = COMPAT_RLIM_INFINITY;
371
372 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
373 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
374 __put_user(r.rlim_max, &rlim->rlim_max))
375 return -EFAULT;
376 }
377 return ret;
378}
379
380#endif
381
b9518345 382asmlinkage long compat_sys_getrlimit(unsigned int resource,
1da177e4
LT		 383 struct compat_rlimit __user *rlim)
384{
385 struct rlimit r;
386 int ret;
1da177e4 387
b9518345 388 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 389 if (!ret) {
390 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
391 r.rlim_cur = COMPAT_RLIM_INFINITY;
392 if (r.rlim_max > COMPAT_RLIM_INFINITY)
393 r.rlim_max = COMPAT_RLIM_INFINITY;
394
395 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
396 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
397 __put_user(r.rlim_max, &rlim->rlim_max))
398 return -EFAULT;
399 }
400 return ret;
401}
402
403int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
404{
405 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
406 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
407 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
408 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
409 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
410 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
411 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
412 __put_user(r->ru_idrss, &ru->ru_idrss) ||
413 __put_user(r->ru_isrss, &ru->ru_isrss) ||
414 __put_user(r->ru_minflt, &ru->ru_minflt) ||
415 __put_user(r->ru_majflt, &ru->ru_majflt) ||
416 __put_user(r->ru_nswap, &ru->ru_nswap) ||
417 __put_user(r->ru_inblock, &ru->ru_inblock) ||
418 __put_user(r->ru_oublock, &ru->ru_oublock) ||
419 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
420 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
421 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
422 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
423 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
424 return -EFAULT;
425 return 0;
426}
427
428asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
429{
430 struct rusage r;
431 int ret;
432 mm_segment_t old_fs = get_fs();
433
434 set_fs(KERNEL_DS);
435 ret = sys_getrusage(who, (struct rusage __user *) &r);
436 set_fs(old_fs);
437
438 if (ret)
439 return ret;
440
441 if (put_compat_rusage(&r, ru))
442 return -EFAULT;
443
444 return 0;
445}
446
447asmlinkage long
448compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
449 struct compat_rusage __user *ru)
450{
451 if (!ru) {
452 return sys_wait4(pid, stat_addr, options, NULL);
453 } else {
454 struct rusage r;
455 int ret;
456 unsigned int status;
457 mm_segment_t old_fs = get_fs();
458
459 set_fs (KERNEL_DS);
460 ret = sys_wait4(pid,
461 (stat_addr ?
462 (unsigned int __user *) &status : NULL),
463 options, (struct rusage __user *) &r);
464 set_fs (old_fs);
465
466 if (ret > 0) {
467 if (put_compat_rusage(&r, ru))
468 return -EFAULT;
469 if (stat_addr && put_user(status, stat_addr))
470 return -EFAULT;
471 }
472 return ret;
473 }
474}
475
476asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
477 struct compat_siginfo __user *uinfo, int options,
478 struct compat_rusage __user *uru)
479{
480 siginfo_t info;
481 struct rusage ru;
482 long ret;
483 mm_segment_t old_fs = get_fs();
484
485 memset(&info, 0, sizeof(info));
486
487 set_fs(KERNEL_DS);
488 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
489 uru ? (struct rusage __user *)&ru : NULL);
490 set_fs(old_fs);
491
492 if ((ret < 0) || (info.si_signo == 0))
493 return ret;
494
495 if (uru) {
496 ret = put_compat_rusage(&ru, uru);
497 if (ret)
498 return ret;
499 }
500
501 BUG_ON(info.si_code & __SI_MASK);
502 info.si_code |= __SI_CHLD;
503 return copy_siginfo_to_user32(uinfo, &info);
504}
505
506static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 507 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 508{
509 unsigned long *k;
510
a45185d2
RR		 511 if (len < cpumask_size())
512 memset(new_mask, 0, cpumask_size());
513 else if (len > cpumask_size())
514 len = cpumask_size();
1da177e4 515
a45185d2 516 k = cpumask_bits(new_mask);
1da177e4
LT		 517 return compat_get_bitmap(k, user_mask_ptr, len * 8);
518}
519
520asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
521 unsigned int len,
522 compat_ulong_t __user *user_mask_ptr)
523{
a45185d2 524 cpumask_var_t new_mask;
1da177e4
LT		 525 int retval;
526
a45185d2
RR		 527 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
528 return -ENOMEM;
529
530 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 531 if (retval)
a45185d2 532 goto out;
1da177e4 533
a45185d2
RR		 534 retval = sched_setaffinity(pid, new_mask);
535out:
536 free_cpumask_var(new_mask);
537 return retval;
1da177e4
LT		 538}
539
540asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
541 compat_ulong_t __user *user_mask_ptr)
542{
543 int ret;
a45185d2 544 cpumask_var_t mask;
1da177e4 545
fa9dc265
KM		 546 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
547 return -EINVAL;
548 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 549 return -EINVAL;
550
a45185d2
RR		 551 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
552 return -ENOMEM;
553
554 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 555 if (ret == 0) {
556 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 557
fa9dc265
KM		 558 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
559 ret = -EFAULT;
560 else
561 ret = retlen;
562 }
a45185d2 563 free_cpumask_var(mask);
fa9dc265 564
a45185d2 565 return ret;
1da177e4
LT		 566}
567
83f5d126
DL		 568int get_compat_itimerspec(struct itimerspec *dst,
569 const struct compat_itimerspec __user *src)
bd3a8492 570{
1da177e4
LT		 571 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
572 get_compat_timespec(&dst->it_value, &src->it_value))
573 return -EFAULT;
574 return 0;
bd3a8492 575}
1da177e4 576
83f5d126
DL		 577int put_compat_itimerspec(struct compat_itimerspec __user *dst,
578 const struct itimerspec *src)
bd3a8492 579{
1da177e4
LT		 580 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
581 put_compat_timespec(&src->it_value, &dst->it_value))
582 return -EFAULT;
583 return 0;
bd3a8492 584}
1da177e4 585
3a0f69d5
CH		 586long compat_sys_timer_create(clockid_t which_clock,
587 struct compat_sigevent __user *timer_event_spec,
588 timer_t __user *created_timer_id)
589{
590 struct sigevent __user *event = NULL;
591
592 if (timer_event_spec) {
593 struct sigevent kevent;
594
595 event = compat_alloc_user_space(sizeof(*event));
596 if (get_compat_sigevent(&kevent, timer_event_spec) ||
597 copy_to_user(event, &kevent, sizeof(*event)))
598 return -EFAULT;
599 }
600
601 return sys_timer_create(which_clock, event, created_timer_id);
602}
603
1da177e4 604long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 605 struct compat_itimerspec __user *new,
1da177e4 606 struct compat_itimerspec __user *old)
bd3a8492 607{
1da177e4
LT		 608 long err;
609 mm_segment_t oldfs;
610 struct itimerspec newts, oldts;
611
612 if (!new)
613 return -EINVAL;
614 if (get_compat_itimerspec(&newts, new))
bd3a8492 615 return -EFAULT;
1da177e4
LT		 616 oldfs = get_fs();
617 set_fs(KERNEL_DS);
618 err = sys_timer_settime(timer_id, flags,
619 (struct itimerspec __user *) &newts,
620 (struct itimerspec __user *) &oldts);
bd3a8492 621 set_fs(oldfs);
1da177e4
LT		 622 if (!err && old && put_compat_itimerspec(old, &oldts))
623 return -EFAULT;
624 return err;
bd3a8492 625}
1da177e4
LT		 626
627long compat_sys_timer_gettime(timer_t timer_id,
628 struct compat_itimerspec __user *setting)
bd3a8492 629{
1da177e4
LT		 630 long err;
631 mm_segment_t oldfs;
bd3a8492 632 struct itimerspec ts;
1da177e4
LT		 633
634 oldfs = get_fs();
635 set_fs(KERNEL_DS);
636 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 637 (struct itimerspec __user *) &ts);
638 set_fs(oldfs);
1da177e4
LT		 639 if (!err && put_compat_itimerspec(setting, &ts))
640 return -EFAULT;
641 return err;
bd3a8492 642}
1da177e4
LT		 643
644long compat_sys_clock_settime(clockid_t which_clock,
645 struct compat_timespec __user *tp)
646{
647 long err;
648 mm_segment_t oldfs;
bd3a8492 649 struct timespec ts;
1da177e4
LT		 650
651 if (get_compat_timespec(&ts, tp))
bd3a8492 652 return -EFAULT;
1da177e4 653 oldfs = get_fs();
bd3a8492 654 set_fs(KERNEL_DS);
1da177e4
LT		 655 err = sys_clock_settime(which_clock,
656 (struct timespec __user *) &ts);
657 set_fs(oldfs);
658 return err;
bd3a8492 659}
1da177e4
LT		 660
661long compat_sys_clock_gettime(clockid_t which_clock,
662 struct compat_timespec __user *tp)
663{
664 long err;
665 mm_segment_t oldfs;
bd3a8492 666 struct timespec ts;
1da177e4
LT		 667
668 oldfs = get_fs();
669 set_fs(KERNEL_DS);
670 err = sys_clock_gettime(which_clock,
671 (struct timespec __user *) &ts);
672 set_fs(oldfs);
673 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 674 return -EFAULT;
1da177e4 675 return err;
bd3a8492 676}
1da177e4 677
f1f1d5eb
RC		 678long compat_sys_clock_adjtime(clockid_t which_clock,
679 struct compat_timex __user *utp)
680{
681 struct timex txc;
682 mm_segment_t oldfs;
683 int err, ret;
684
685 err = compat_get_timex(&txc, utp);
686 if (err)
687 return err;
688
689 oldfs = get_fs();
690 set_fs(KERNEL_DS);
691 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
692 set_fs(oldfs);
693
694 err = compat_put_timex(utp, &txc);
695 if (err)
696 return err;
697
698 return ret;
699}
700
1da177e4
LT		 701long compat_sys_clock_getres(clockid_t which_clock,
702 struct compat_timespec __user *tp)
703{
704 long err;
705 mm_segment_t oldfs;
bd3a8492 706 struct timespec ts;
1da177e4
LT		 707
708 oldfs = get_fs();
709 set_fs(KERNEL_DS);
710 err = sys_clock_getres(which_clock,
711 (struct timespec __user *) &ts);
712 set_fs(oldfs);
713 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 714 return -EFAULT;
1da177e4 715 return err;
bd3a8492 716}
1da177e4 717
1711ef38
TA		 718static long compat_clock_nanosleep_restart(struct restart_block *restart)
719{
720 long err;
721 mm_segment_t oldfs;
722 struct timespec tu;
029a07e0 723 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 724
029a07e0 725 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 726 oldfs = get_fs();
727 set_fs(KERNEL_DS);
728 err = clock_nanosleep_restart(restart);
729 set_fs(oldfs);
730
731 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
732 put_compat_timespec(&tu, rmtp))
733 return -EFAULT;
734
735 if (err == -ERESTART_RESTARTBLOCK) {
736 restart->fn = compat_clock_nanosleep_restart;
029a07e0 737 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 738 }
739 return err;
740}
741
1da177e4
LT		 742long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
743 struct compat_timespec __user *rqtp,
744 struct compat_timespec __user *rmtp)
745{
746 long err;
747 mm_segment_t oldfs;
bd3a8492 748 struct timespec in, out;
1711ef38 749 struct restart_block *restart;
1da177e4 750
bd3a8492 751 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 752 return -EFAULT;
753
754 oldfs = get_fs();
755 set_fs(KERNEL_DS);
756 err = sys_clock_nanosleep(which_clock, flags,
757 (struct timespec __user *) &in,
758 (struct timespec __user *) &out);
759 set_fs(oldfs);
1711ef38 760
1da177e4
LT		 761 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
762 put_compat_timespec(&out, rmtp))
763 return -EFAULT;
1711ef38
TA		 764
765 if (err == -ERESTART_RESTARTBLOCK) {
766 restart = &current_thread_info()->restart_block;
767 restart->fn = compat_clock_nanosleep_restart;
029a07e0 768 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 769 }
bd3a8492
DW		 770 return err;
771}
1da177e4
LT		 772
773/*
774 * We currently only need the following fields from the sigevent
775 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
776 * sigev_notify_thread_id). The others are handled in user mode.
777 * We also assume that copying sigev_value.sival_int is sufficient
778 * to keep all the bits of sigev_value.sival_ptr intact.
779 */
780int get_compat_sigevent(struct sigevent *event,
781 const struct compat_sigevent __user *u_event)
782{
51410d3c 783 memset(event, 0, sizeof(*event));
1da177e4
LT		 784 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
785 __get_user(event->sigev_value.sival_int,
786 &u_event->sigev_value.sival_int) ||
787 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
788 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
789 __get_user(event->sigev_notify_thread_id,
790 &u_event->sigev_notify_thread_id))
791 ? -EFAULT : 0;
792}
793
5fa3839a 794long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 795 unsigned long bitmap_size)
796{
797 int i, j;
798 unsigned long m;
799 compat_ulong_t um;
800 unsigned long nr_compat_longs;
801
802 /* align bitmap up to nearest compat_long_t boundary */
803 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
804
805 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
806 return -EFAULT;
807
808 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
809
810 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
811 m = 0;
812
813 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
814 /*
815 * We dont want to read past the end of the userspace
816 * bitmap. We must however ensure the end of the
817 * kernel bitmap is zeroed.
818 */
819 if (nr_compat_longs-- > 0) {
820 if (__get_user(um, umask))
821 return -EFAULT;
822 } else {
823 um = 0;
824 }
825
826 umask++;
827 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
828 }
829 *mask++ = m;
830 }
831
832 return 0;
833}
834
835long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
836 unsigned long bitmap_size)
837{
838 int i, j;
839 unsigned long m;
840 compat_ulong_t um;
841 unsigned long nr_compat_longs;
842
843 /* align bitmap up to nearest compat_long_t boundary */
844 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
845
846 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
847 return -EFAULT;
848
849 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
850
851 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
852 m = *mask++;
853
854 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
855 um = m;
856
857 /*
858 * We dont want to write past the end of the userspace
859 * bitmap.
860 */
861 if (nr_compat_longs-- > 0) {
862 if (__put_user(um, umask))
863 return -EFAULT;
864 }
865
866 umask++;
867 m >>= 4*sizeof(um);
868 m >>= 4*sizeof(um);
869 }
870 }
871
872 return 0;
873}
874
875void
876sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
877{
878 switch (_NSIG_WORDS) {
1da177e4
LT		 879 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
880 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
881 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
882 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 883 }
884}
885
886asmlinkage long
887compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
888 struct compat_siginfo __user *uinfo,
889 struct compat_timespec __user *uts, compat_size_t sigsetsize)
890{
891 compat_sigset_t s32;
892 sigset_t s;
893 int sig;
894 struct timespec t;
895 siginfo_t info;
896 long ret, timeout = 0;
897
898 if (sigsetsize != sizeof(sigset_t))
899 return -EINVAL;
900
901 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
902 return -EFAULT;
903 sigset_from_compat(&s, &s32);
904 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
905 signotset(&s);
906
907 if (uts) {
908 if (get_compat_timespec (&t, uts))
909 return -EFAULT;
910 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
911 || t.tv_sec < 0)
912 return -EINVAL;
913 }
914
915 spin_lock_irq(&current->sighand->siglock);
916 sig = dequeue_signal(current, &s, &info);
917 if (!sig) {
918 timeout = MAX_SCHEDULE_TIMEOUT;
919 if (uts)
920 timeout = timespec_to_jiffies(&t)
921 +(t.tv_sec || t.tv_nsec);
922 if (timeout) {
923 current->real_blocked = current->blocked;
924 sigandsets(&current->blocked, &current->blocked, &s);
925
926 recalc_sigpending();
927 spin_unlock_irq(&current->sighand->siglock);
928
75bcc8c5 929 timeout = schedule_timeout_interruptible(timeout);
1da177e4
LT		 930
931 spin_lock_irq(&current->sighand->siglock);
932 sig = dequeue_signal(current, &s, &info);
933 current->blocked = current->real_blocked;
934 siginitset(&current->real_blocked, 0);
935 recalc_sigpending();
936 }
937 }
938 spin_unlock_irq(&current->sighand->siglock);
939
940 if (sig) {
941 ret = sig;
942 if (uinfo) {
943 if (copy_siginfo_to_user32(uinfo, &info))
944 ret = -EFAULT;
945 }
946 }else {
947 ret = timeout?-EINTR:-EAGAIN;
948 }
949 return ret;
950
951}
952
62ab4505
TG		 953asmlinkage long
954compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
955 struct compat_siginfo __user *uinfo)
956{
957 siginfo_t info;
958
959 if (copy_siginfo_from_user32(&info, uinfo))
960 return -EFAULT;
961 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
962}
963
1da177e4
LT		 964#ifdef __ARCH_WANT_COMPAT_SYS_TIME
965
966/* compat_time_t is a 32 bit "long" and needs to get converted. */
967
968asmlinkage long compat_sys_time(compat_time_t __user * tloc)
969{
970 compat_time_t i;
971 struct timeval tv;
972
973 do_gettimeofday(&tv);
974 i = tv.tv_sec;
975
976 if (tloc) {
977 if (put_user(i,tloc))
e3d5a27d 978 return -EFAULT;
1da177e4 979 }
e3d5a27d 980 force_successful_syscall_return();
1da177e4
LT		 981 return i;
982}
983
984asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
985{
986 struct timespec tv;
987 int err;
988
989 if (get_user(tv.tv_sec, tptr))
990 return -EFAULT;
991
992 tv.tv_nsec = 0;
993
994 err = security_settime(&tv, NULL);
995 if (err)
996 return err;
997
998 do_settimeofday(&tv);
999 return 0;
1000}
1001
1002#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 1003
1004#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1005asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1006{
1007 sigset_t newset;
1008 compat_sigset_t newset32;
1009
1010 /* XXX: Don't preclude handling different sized sigset_t's. */
1011 if (sigsetsize != sizeof(sigset_t))
1012 return -EINVAL;
1013
1014 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1015 return -EFAULT;
1016 sigset_from_compat(&newset, &newset32);
1017 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1018
1019 spin_lock_irq(&current->sighand->siglock);
1020 current->saved_sigmask = current->blocked;
1021 current->blocked = newset;
1022 recalc_sigpending();
1023 spin_unlock_irq(&current->sighand->siglock);
1024
1025 current->state = TASK_INTERRUPTIBLE;
1026 schedule();
4e4c22c7 1027 set_restore_sigmask();
150256d8
DW		 1028 return -ERESTARTNOHAND;
1029}
1030#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 1031
1032asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1033{
1034 struct timex txc;
65f5d80b 1035 int err, ret;
3158e941 1036
65f5d80b
RC		 1037 err = compat_get_timex(&txc, utp);
1038 if (err)
1039 return err;
3158e941
SR		 1040
1041 ret = do_adjtimex(&txc);
1042
65f5d80b
RC		 1043 err = compat_put_timex(utp, &txc);
1044 if (err)
1045 return err;
3158e941
SR		 1046
1047 return ret;
1048}
1b2db9fb
CL		 1049
1050#ifdef CONFIG_NUMA
1051asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1052 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1053 const int __user *nodes,
1054 int __user *status,
1055 int flags)
1056{
1057 const void __user * __user *pages;
1058 int i;
1059
1060 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1061 for (i = 0; i < nr_pages; i++) {
1062 compat_uptr_t p;
1063
9216dfad 1064 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1065 put_user(compat_ptr(p), pages + i))
1066 return -EFAULT;
1067 }
1068 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1069}
3fd59397
SR		 1070
1071asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1072 compat_ulong_t maxnode,
1073 const compat_ulong_t __user *old_nodes,
1074 const compat_ulong_t __user *new_nodes)
1075{
1076 unsigned long __user *old = NULL;
1077 unsigned long __user *new = NULL;
1078 nodemask_t tmp_mask;
1079 unsigned long nr_bits;
1080 unsigned long size;
1081
1082 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1083 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1084 if (old_nodes) {
1085 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1086 return -EFAULT;
1087 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1088 if (new_nodes)
1089 new = old + size / sizeof(unsigned long);
1090 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1091 return -EFAULT;
1092 }
1093 if (new_nodes) {
1094 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1095 return -EFAULT;
1096 if (new == NULL)
1097 new = compat_alloc_user_space(size);
1098 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1099 return -EFAULT;
1100 }
1101 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1102}
1b2db9fb 1103#endif
d4d23add
KM		 1104
1105struct compat_sysinfo {
1106 s32 uptime;
1107 u32 loads[3];
1108 u32 totalram;
1109 u32 freeram;
1110 u32 sharedram;
1111 u32 bufferram;
1112 u32 totalswap;
1113 u32 freeswap;
1114 u16 procs;
1115 u16 pad;
1116 u32 totalhigh;
1117 u32 freehigh;
1118 u32 mem_unit;
1119 char _f[20-2*sizeof(u32)-sizeof(int)];
1120};
1121
1122asmlinkage long
1123compat_sys_sysinfo(struct compat_sysinfo __user *info)
1124{
1125 struct sysinfo s;
1126
1127 do_sysinfo(&s);
1128
1129 /* Check to see if any memory value is too large for 32-bit and scale
1130 * down if needed
1131 */
1132 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1133 int bitcount = 0;
1134
1135 while (s.mem_unit < PAGE_SIZE) {
1136 s.mem_unit <<= 1;
1137 bitcount++;
1138 }
1139
1140 s.totalram >>= bitcount;
1141 s.freeram >>= bitcount;
1142 s.sharedram >>= bitcount;
1143 s.bufferram >>= bitcount;
1144 s.totalswap >>= bitcount;
1145 s.freeswap >>= bitcount;
1146 s.totalhigh >>= bitcount;
1147 s.freehigh >>= bitcount;
1148 }
1149
1150 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1151 __put_user (s.uptime, &info->uptime) ||
1152 __put_user (s.loads[0], &info->loads[0]) ||
1153 __put_user (s.loads[1], &info->loads[1]) ||
1154 __put_user (s.loads[2], &info->loads[2]) ||
1155 __put_user (s.totalram, &info->totalram) ||
1156 __put_user (s.freeram, &info->freeram) ||
1157 __put_user (s.sharedram, &info->sharedram) ||
1158 __put_user (s.bufferram, &info->bufferram) ||
1159 __put_user (s.totalswap, &info->totalswap) ||
1160 __put_user (s.freeswap, &info->freeswap) ||
1161 __put_user (s.procs, &info->procs) ||
1162 __put_user (s.totalhigh, &info->totalhigh) ||
1163 __put_user (s.freehigh, &info->freehigh) ||
1164 __put_user (s.mem_unit, &info->mem_unit))
1165 return -EFAULT;
1166
1167 return 0;
1168}
c41d68a5
PA		 1169
1170/*
1171 * Allocate user-space memory for the duration of a single system call,
1172 * in order to marshall parameters inside a compat thunk.
1173 */
1174void __user *compat_alloc_user_space(unsigned long len)
1175{
1176 void __user *ptr;
1177
1178 /* If len would occupy more than half of the entire compat space... */
1179 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1180 return NULL;
1181
1182 ptr = arch_compat_alloc_user_space(len);
1183
1184 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1185 return NULL;
1186
1187 return ptr;
1188}
1189EXPORT_SYMBOL_GPL(compat_alloc_user_space);
kernel source for telekom puls (alcatel/mediatek)