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[PATCH] proc: remove the useless SMP-safe comments from /proc
[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>
1da177e4
LT		 26
27#include <asm/uaccess.h>
1da177e4 28
07f3f05c
DH		 29extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
30
1da177e4
LT		 31int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
32{
33 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
34 __get_user(ts->tv_sec, &cts->tv_sec) ||
35 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
36}
37
38int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
39{
40 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
41 __put_user(ts->tv_sec, &cts->tv_sec) ||
42 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
43}
44
45static long compat_nanosleep_restart(struct restart_block *restart)
46{
47 unsigned long expire = restart->arg0, now = jiffies;
48 struct compat_timespec __user *rmtp;
49
50 /* Did it expire while we handled signals? */
51 if (!time_after(expire, now))
52 return 0;
53
75bcc8c5 54 expire = schedule_timeout_interruptible(expire - now);
1da177e4
LT		 55 if (expire == 0)
56 return 0;
57
58 rmtp = (struct compat_timespec __user *)restart->arg1;
59 if (rmtp) {
60 struct compat_timespec ct;
61 struct timespec t;
62
63 jiffies_to_timespec(expire, &t);
64 ct.tv_sec = t.tv_sec;
65 ct.tv_nsec = t.tv_nsec;
66 if (copy_to_user(rmtp, &ct, sizeof(ct)))
67 return -EFAULT;
68 }
69 /* The 'restart' block is already filled in */
70 return -ERESTART_RESTARTBLOCK;
71}
72
73asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
74 struct compat_timespec __user *rmtp)
75{
76 struct timespec t;
77 struct restart_block *restart;
78 unsigned long expire;
79
80 if (get_compat_timespec(&t, rqtp))
81 return -EFAULT;
82
83 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
84 return -EINVAL;
85
86 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
75bcc8c5 87 expire = schedule_timeout_interruptible(expire);
1da177e4
LT		 88 if (expire == 0)
89 return 0;
90
91 if (rmtp) {
92 jiffies_to_timespec(expire, &t);
93 if (put_compat_timespec(&t, rmtp))
94 return -EFAULT;
95 }
96 restart = &current_thread_info()->restart_block;
97 restart->fn = compat_nanosleep_restart;
98 restart->arg0 = jiffies + expire;
99 restart->arg1 = (unsigned long) rmtp;
100 return -ERESTART_RESTARTBLOCK;
101}
102
103static inline long get_compat_itimerval(struct itimerval *o,
104 struct compat_itimerval __user *i)
105{
106 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
107 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
108 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
109 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
110 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
111}
112
113static inline long put_compat_itimerval(struct compat_itimerval __user *o,
114 struct itimerval *i)
115{
116 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
117 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
118 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
119 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
120 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
121}
122
123asmlinkage long compat_sys_getitimer(int which,
124 struct compat_itimerval __user *it)
125{
126 struct itimerval kit;
127 int error;
128
129 error = do_getitimer(which, &kit);
130 if (!error && put_compat_itimerval(it, &kit))
131 error = -EFAULT;
132 return error;
133}
134
135asmlinkage long compat_sys_setitimer(int which,
136 struct compat_itimerval __user *in,
137 struct compat_itimerval __user *out)
138{
139 struct itimerval kin, kout;
140 int error;
141
142 if (in) {
143 if (get_compat_itimerval(&kin, in))
144 return -EFAULT;
145 } else
146 memset(&kin, 0, sizeof(kin));
147
148 error = do_setitimer(which, &kin, out ? &kout : NULL);
149 if (error || !out)
150 return error;
151 if (put_compat_itimerval(out, &kout))
152 return -EFAULT;
153 return 0;
154}
155
156asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
157{
158 /*
159 * In the SMP world we might just be unlucky and have one of
160 * the times increment as we use it. Since the value is an
161 * atomically safe type this is just fine. Conceptually its
162 * as if the syscall took an instant longer to occur.
163 */
164 if (tbuf) {
165 struct compat_tms tmp;
166 struct task_struct *tsk = current;
167 struct task_struct *t;
168 cputime_t utime, stime, cutime, cstime;
169
170 read_lock(&tasklist_lock);
171 utime = tsk->signal->utime;
172 stime = tsk->signal->stime;
173 t = tsk;
174 do {
175 utime = cputime_add(utime, t->utime);
176 stime = cputime_add(stime, t->stime);
177 t = next_thread(t);
178 } while (t != tsk);
179
180 /*
181 * While we have tasklist_lock read-locked, no dying thread
182 * can be updating current->signal->[us]time. Instead,
183 * we got their counts included in the live thread loop.
184 * However, another thread can come in right now and
185 * do a wait call that updates current->signal->c[us]time.
186 * To make sure we always see that pair updated atomically,
187 * we take the siglock around fetching them.
188 */
189 spin_lock_irq(&tsk->sighand->siglock);
190 cutime = tsk->signal->cutime;
191 cstime = tsk->signal->cstime;
192 spin_unlock_irq(&tsk->sighand->siglock);
193 read_unlock(&tasklist_lock);
194
195 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
196 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
197 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
198 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
199 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
200 return -EFAULT;
201 }
202 return compat_jiffies_to_clock_t(jiffies);
203}
204
205/*
206 * Assumption: old_sigset_t and compat_old_sigset_t are both
207 * types that can be passed to put_user()/get_user().
208 */
209
210asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
211{
212 old_sigset_t s;
213 long ret;
214 mm_segment_t old_fs = get_fs();
215
216 set_fs(KERNEL_DS);
217 ret = sys_sigpending((old_sigset_t __user *) &s);
218 set_fs(old_fs);
219 if (ret == 0)
220 ret = put_user(s, set);
221 return ret;
222}
223
224asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
225 compat_old_sigset_t __user *oset)
226{
227 old_sigset_t s;
228 long ret;
229 mm_segment_t old_fs;
230
231 if (set && get_user(s, set))
232 return -EFAULT;
233 old_fs = get_fs();
234 set_fs(KERNEL_DS);
235 ret = sys_sigprocmask(how,
236 set ? (old_sigset_t __user *) &s : NULL,
237 oset ? (old_sigset_t __user *) &s : NULL);
238 set_fs(old_fs);
239 if (ret == 0)
240 if (oset)
241 ret = put_user(s, oset);
242 return ret;
243}
244
1da177e4
LT		 245asmlinkage long compat_sys_setrlimit(unsigned int resource,
246 struct compat_rlimit __user *rlim)
247{
248 struct rlimit r;
249 int ret;
250 mm_segment_t old_fs = get_fs ();
251
252 if (resource >= RLIM_NLIMITS)
253 return -EINVAL;
254
255 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
256 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
257 __get_user(r.rlim_max, &rlim->rlim_max))
258 return -EFAULT;
259
260 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
261 r.rlim_cur = RLIM_INFINITY;
262 if (r.rlim_max == COMPAT_RLIM_INFINITY)
263 r.rlim_max = RLIM_INFINITY;
264 set_fs(KERNEL_DS);
265 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
266 set_fs(old_fs);
267 return ret;
268}
269
270#ifdef COMPAT_RLIM_OLD_INFINITY
271
272asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
273 struct compat_rlimit __user *rlim)
274{
275 struct rlimit r;
276 int ret;
277 mm_segment_t old_fs = get_fs();
278
279 set_fs(KERNEL_DS);
280 ret = sys_old_getrlimit(resource, &r);
281 set_fs(old_fs);
282
283 if (!ret) {
284 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
285 r.rlim_cur = COMPAT_RLIM_INFINITY;
286 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
287 r.rlim_max = COMPAT_RLIM_INFINITY;
288
289 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
290 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
291 __put_user(r.rlim_max, &rlim->rlim_max))
292 return -EFAULT;
293 }
294 return ret;
295}
296
297#endif
298
299asmlinkage long compat_sys_getrlimit (unsigned int resource,
300 struct compat_rlimit __user *rlim)
301{
302 struct rlimit r;
303 int ret;
304 mm_segment_t old_fs = get_fs();
305
306 set_fs(KERNEL_DS);
307 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
308 set_fs(old_fs);
309 if (!ret) {
310 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
311 r.rlim_cur = COMPAT_RLIM_INFINITY;
312 if (r.rlim_max > COMPAT_RLIM_INFINITY)
313 r.rlim_max = COMPAT_RLIM_INFINITY;
314
315 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
316 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
317 __put_user(r.rlim_max, &rlim->rlim_max))
318 return -EFAULT;
319 }
320 return ret;
321}
322
323int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
324{
325 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
326 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
327 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
328 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
329 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
330 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
331 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
332 __put_user(r->ru_idrss, &ru->ru_idrss) ||
333 __put_user(r->ru_isrss, &ru->ru_isrss) ||
334 __put_user(r->ru_minflt, &ru->ru_minflt) ||
335 __put_user(r->ru_majflt, &ru->ru_majflt) ||
336 __put_user(r->ru_nswap, &ru->ru_nswap) ||
337 __put_user(r->ru_inblock, &ru->ru_inblock) ||
338 __put_user(r->ru_oublock, &ru->ru_oublock) ||
339 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
340 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
341 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
342 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
343 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
344 return -EFAULT;
345 return 0;
346}
347
348asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
349{
350 struct rusage r;
351 int ret;
352 mm_segment_t old_fs = get_fs();
353
354 set_fs(KERNEL_DS);
355 ret = sys_getrusage(who, (struct rusage __user *) &r);
356 set_fs(old_fs);
357
358 if (ret)
359 return ret;
360
361 if (put_compat_rusage(&r, ru))
362 return -EFAULT;
363
364 return 0;
365}
366
367asmlinkage long
368compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
369 struct compat_rusage __user *ru)
370{
371 if (!ru) {
372 return sys_wait4(pid, stat_addr, options, NULL);
373 } else {
374 struct rusage r;
375 int ret;
376 unsigned int status;
377 mm_segment_t old_fs = get_fs();
378
379 set_fs (KERNEL_DS);
380 ret = sys_wait4(pid,
381 (stat_addr ?
382 (unsigned int __user *) &status : NULL),
383 options, (struct rusage __user *) &r);
384 set_fs (old_fs);
385
386 if (ret > 0) {
387 if (put_compat_rusage(&r, ru))
388 return -EFAULT;
389 if (stat_addr && put_user(status, stat_addr))
390 return -EFAULT;
391 }
392 return ret;
393 }
394}
395
396asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
397 struct compat_siginfo __user *uinfo, int options,
398 struct compat_rusage __user *uru)
399{
400 siginfo_t info;
401 struct rusage ru;
402 long ret;
403 mm_segment_t old_fs = get_fs();
404
405 memset(&info, 0, sizeof(info));
406
407 set_fs(KERNEL_DS);
408 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
409 uru ? (struct rusage __user *)&ru : NULL);
410 set_fs(old_fs);
411
412 if ((ret < 0) || (info.si_signo == 0))
413 return ret;
414
415 if (uru) {
416 ret = put_compat_rusage(&ru, uru);
417 if (ret)
418 return ret;
419 }
420
421 BUG_ON(info.si_code & __SI_MASK);
422 info.si_code |= __SI_CHLD;
423 return copy_siginfo_to_user32(uinfo, &info);
424}
425
426static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
427 unsigned len, cpumask_t *new_mask)
428{
429 unsigned long *k;
430
431 if (len < sizeof(cpumask_t))
432 memset(new_mask, 0, sizeof(cpumask_t));
433 else if (len > sizeof(cpumask_t))
434 len = sizeof(cpumask_t);
435
436 k = cpus_addr(*new_mask);
437 return compat_get_bitmap(k, user_mask_ptr, len * 8);
438}
439
440asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
441 unsigned int len,
442 compat_ulong_t __user *user_mask_ptr)
443{
444 cpumask_t new_mask;
445 int retval;
446
447 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
448 if (retval)
449 return retval;
450
451 return sched_setaffinity(pid, new_mask);
452}
453
454asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
455 compat_ulong_t __user *user_mask_ptr)
456{
457 int ret;
458 cpumask_t mask;
459 unsigned long *k;
460 unsigned int min_length = sizeof(cpumask_t);
461
462 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
463 min_length = sizeof(compat_ulong_t);
464
465 if (len < min_length)
466 return -EINVAL;
467
468 ret = sched_getaffinity(pid, &mask);
469 if (ret < 0)
470 return ret;
471
472 k = cpus_addr(mask);
473 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
474 if (ret)
475 return ret;
476
477 return min_length;
478}
479
480static int get_compat_itimerspec(struct itimerspec *dst,
481 struct compat_itimerspec __user *src)
482{
483 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
484 get_compat_timespec(&dst->it_value, &src->it_value))
485 return -EFAULT;
486 return 0;
487}
488
489static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
490 struct itimerspec *src)
491{
492 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
493 put_compat_timespec(&src->it_value, &dst->it_value))
494 return -EFAULT;
495 return 0;
496}
497
3a0f69d5
CH		 498long compat_sys_timer_create(clockid_t which_clock,
499 struct compat_sigevent __user *timer_event_spec,
500 timer_t __user *created_timer_id)
501{
502 struct sigevent __user *event = NULL;
503
504 if (timer_event_spec) {
505 struct sigevent kevent;
506
507 event = compat_alloc_user_space(sizeof(*event));
508 if (get_compat_sigevent(&kevent, timer_event_spec) ||
509 copy_to_user(event, &kevent, sizeof(*event)))
510 return -EFAULT;
511 }
512
513 return sys_timer_create(which_clock, event, created_timer_id);
514}
515
1da177e4
LT		 516long compat_sys_timer_settime(timer_t timer_id, int flags,
517 struct compat_itimerspec __user *new,
518 struct compat_itimerspec __user *old)
519{
520 long err;
521 mm_segment_t oldfs;
522 struct itimerspec newts, oldts;
523
524 if (!new)
525 return -EINVAL;
526 if (get_compat_itimerspec(&newts, new))
527 return -EFAULT;
528 oldfs = get_fs();
529 set_fs(KERNEL_DS);
530 err = sys_timer_settime(timer_id, flags,
531 (struct itimerspec __user *) &newts,
532 (struct itimerspec __user *) &oldts);
533 set_fs(oldfs);
534 if (!err && old && put_compat_itimerspec(old, &oldts))
535 return -EFAULT;
536 return err;
537}
538
539long compat_sys_timer_gettime(timer_t timer_id,
540 struct compat_itimerspec __user *setting)
541{
542 long err;
543 mm_segment_t oldfs;
544 struct itimerspec ts;
545
546 oldfs = get_fs();
547 set_fs(KERNEL_DS);
548 err = sys_timer_gettime(timer_id,
549 (struct itimerspec __user *) &ts);
550 set_fs(oldfs);
551 if (!err && put_compat_itimerspec(setting, &ts))
552 return -EFAULT;
553 return err;
554}
555
556long compat_sys_clock_settime(clockid_t which_clock,
557 struct compat_timespec __user *tp)
558{
559 long err;
560 mm_segment_t oldfs;
561 struct timespec ts;
562
563 if (get_compat_timespec(&ts, tp))
564 return -EFAULT;
565 oldfs = get_fs();
566 set_fs(KERNEL_DS);
567 err = sys_clock_settime(which_clock,
568 (struct timespec __user *) &ts);
569 set_fs(oldfs);
570 return err;
571}
572
573long compat_sys_clock_gettime(clockid_t which_clock,
574 struct compat_timespec __user *tp)
575{
576 long err;
577 mm_segment_t oldfs;
578 struct timespec ts;
579
580 oldfs = get_fs();
581 set_fs(KERNEL_DS);
582 err = sys_clock_gettime(which_clock,
583 (struct timespec __user *) &ts);
584 set_fs(oldfs);
585 if (!err && put_compat_timespec(&ts, tp))
586 return -EFAULT;
587 return err;
588}
589
590long compat_sys_clock_getres(clockid_t which_clock,
591 struct compat_timespec __user *tp)
592{
593 long err;
594 mm_segment_t oldfs;
595 struct timespec ts;
596
597 oldfs = get_fs();
598 set_fs(KERNEL_DS);
599 err = sys_clock_getres(which_clock,
600 (struct timespec __user *) &ts);
601 set_fs(oldfs);
602 if (!err && tp && put_compat_timespec(&ts, tp))
603 return -EFAULT;
604 return err;
605}
606
1711ef38
TA		 607static long compat_clock_nanosleep_restart(struct restart_block *restart)
608{
609 long err;
610 mm_segment_t oldfs;
611 struct timespec tu;
612 struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
613
614 restart->arg1 = (unsigned long) &tu;
615 oldfs = get_fs();
616 set_fs(KERNEL_DS);
617 err = clock_nanosleep_restart(restart);
618 set_fs(oldfs);
619
620 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
621 put_compat_timespec(&tu, rmtp))
622 return -EFAULT;
623
624 if (err == -ERESTART_RESTARTBLOCK) {
625 restart->fn = compat_clock_nanosleep_restart;
626 restart->arg1 = (unsigned long) rmtp;
627 }
628 return err;
629}
630
1da177e4
LT		 631long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
632 struct compat_timespec __user *rqtp,
633 struct compat_timespec __user *rmtp)
634{
635 long err;
636 mm_segment_t oldfs;
637 struct timespec in, out;
1711ef38 638 struct restart_block *restart;
1da177e4
LT		 639
640 if (get_compat_timespec(&in, rqtp))
641 return -EFAULT;
642
643 oldfs = get_fs();
644 set_fs(KERNEL_DS);
645 err = sys_clock_nanosleep(which_clock, flags,
646 (struct timespec __user *) &in,
647 (struct timespec __user *) &out);
648 set_fs(oldfs);
1711ef38 649
1da177e4
LT		 650 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
651 put_compat_timespec(&out, rmtp))
652 return -EFAULT;
1711ef38
TA		 653
654 if (err == -ERESTART_RESTARTBLOCK) {
655 restart = &current_thread_info()->restart_block;
656 restart->fn = compat_clock_nanosleep_restart;
657 restart->arg1 = (unsigned long) rmtp;
658 }
1da177e4
LT		 659 return err;
660}
661
662/*
663 * We currently only need the following fields from the sigevent
664 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
665 * sigev_notify_thread_id). The others are handled in user mode.
666 * We also assume that copying sigev_value.sival_int is sufficient
667 * to keep all the bits of sigev_value.sival_ptr intact.
668 */
669int get_compat_sigevent(struct sigevent *event,
670 const struct compat_sigevent __user *u_event)
671{
51410d3c 672 memset(event, 0, sizeof(*event));
1da177e4
LT		 673 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
674 __get_user(event->sigev_value.sival_int,
675 &u_event->sigev_value.sival_int) ||
676 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
677 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
678 __get_user(event->sigev_notify_thread_id,
679 &u_event->sigev_notify_thread_id))
680 ? -EFAULT : 0;
681}
682
1da177e4
LT		 683long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
684 unsigned long bitmap_size)
685{
686 int i, j;
687 unsigned long m;
688 compat_ulong_t um;
689 unsigned long nr_compat_longs;
690
691 /* align bitmap up to nearest compat_long_t boundary */
692 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
693
694 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
695 return -EFAULT;
696
697 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
698
699 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
700 m = 0;
701
702 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
703 /*
704 * We dont want to read past the end of the userspace
705 * bitmap. We must however ensure the end of the
706 * kernel bitmap is zeroed.
707 */
708 if (nr_compat_longs-- > 0) {
709 if (__get_user(um, umask))
710 return -EFAULT;
711 } else {
712 um = 0;
713 }
714
715 umask++;
716 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
717 }
718 *mask++ = m;
719 }
720
721 return 0;
722}
723
724long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
725 unsigned long bitmap_size)
726{
727 int i, j;
728 unsigned long m;
729 compat_ulong_t um;
730 unsigned long nr_compat_longs;
731
732 /* align bitmap up to nearest compat_long_t boundary */
733 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
734
735 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
736 return -EFAULT;
737
738 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
739
740 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
741 m = *mask++;
742
743 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
744 um = m;
745
746 /*
747 * We dont want to write past the end of the userspace
748 * bitmap.
749 */
750 if (nr_compat_longs-- > 0) {
751 if (__put_user(um, umask))
752 return -EFAULT;
753 }
754
755 umask++;
756 m >>= 4*sizeof(um);
757 m >>= 4*sizeof(um);
758 }
759 }
760
761 return 0;
762}
763
764void
765sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
766{
767 switch (_NSIG_WORDS) {
1da177e4
LT		 768 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
769 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
770 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
771 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 772 }
773}
774
775asmlinkage long
776compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
777 struct compat_siginfo __user *uinfo,
778 struct compat_timespec __user *uts, compat_size_t sigsetsize)
779{
780 compat_sigset_t s32;
781 sigset_t s;
782 int sig;
783 struct timespec t;
784 siginfo_t info;
785 long ret, timeout = 0;
786
787 if (sigsetsize != sizeof(sigset_t))
788 return -EINVAL;
789
790 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
791 return -EFAULT;
792 sigset_from_compat(&s, &s32);
793 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
794 signotset(&s);
795
796 if (uts) {
797 if (get_compat_timespec (&t, uts))
798 return -EFAULT;
799 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
800 || t.tv_sec < 0)
801 return -EINVAL;
802 }
803
804 spin_lock_irq(&current->sighand->siglock);
805 sig = dequeue_signal(current, &s, &info);
806 if (!sig) {
807 timeout = MAX_SCHEDULE_TIMEOUT;
808 if (uts)
809 timeout = timespec_to_jiffies(&t)
810 +(t.tv_sec || t.tv_nsec);
811 if (timeout) {
812 current->real_blocked = current->blocked;
813 sigandsets(&current->blocked, &current->blocked, &s);
814
815 recalc_sigpending();
816 spin_unlock_irq(&current->sighand->siglock);
817
75bcc8c5 818 timeout = schedule_timeout_interruptible(timeout);
1da177e4
LT		 819
820 spin_lock_irq(&current->sighand->siglock);
821 sig = dequeue_signal(current, &s, &info);
822 current->blocked = current->real_blocked;
823 siginitset(&current->real_blocked, 0);
824 recalc_sigpending();
825 }
826 }
827 spin_unlock_irq(&current->sighand->siglock);
828
829 if (sig) {
830 ret = sig;
831 if (uinfo) {
832 if (copy_siginfo_to_user32(uinfo, &info))
833 ret = -EFAULT;
834 }
835 }else {
836 ret = timeout?-EINTR:-EAGAIN;
837 }
838 return ret;
839
840}
841
842#ifdef __ARCH_WANT_COMPAT_SYS_TIME
843
844/* compat_time_t is a 32 bit "long" and needs to get converted. */
845
846asmlinkage long compat_sys_time(compat_time_t __user * tloc)
847{
848 compat_time_t i;
849 struct timeval tv;
850
851 do_gettimeofday(&tv);
852 i = tv.tv_sec;
853
854 if (tloc) {
855 if (put_user(i,tloc))
856 i = -EFAULT;
857 }
858 return i;
859}
860
861asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
862{
863 struct timespec tv;
864 int err;
865
866 if (get_user(tv.tv_sec, tptr))
867 return -EFAULT;
868
869 tv.tv_nsec = 0;
870
871 err = security_settime(&tv, NULL);
872 if (err)
873 return err;
874
875 do_settimeofday(&tv);
876 return 0;
877}
878
879#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 880
881#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
882asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
883{
884 sigset_t newset;
885 compat_sigset_t newset32;
886
887 /* XXX: Don't preclude handling different sized sigset_t's. */
888 if (sigsetsize != sizeof(sigset_t))
889 return -EINVAL;
890
891 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
892 return -EFAULT;
893 sigset_from_compat(&newset, &newset32);
894 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
895
896 spin_lock_irq(&current->sighand->siglock);
897 current->saved_sigmask = current->blocked;
898 current->blocked = newset;
899 recalc_sigpending();
900 spin_unlock_irq(&current->sighand->siglock);
901
902 current->state = TASK_INTERRUPTIBLE;
903 schedule();
904 set_thread_flag(TIF_RESTORE_SIGMASK);
905 return -ERESTARTNOHAND;
906}
907#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 908
909asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
910{
911 struct timex txc;
912 int ret;
913
914 memset(&txc, 0, sizeof(struct timex));
915
916 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
917 __get_user(txc.modes, &utp->modes) ||
918 __get_user(txc.offset, &utp->offset) ||
919 __get_user(txc.freq, &utp->freq) ||
920 __get_user(txc.maxerror, &utp->maxerror) ||
921 __get_user(txc.esterror, &utp->esterror) ||
922 __get_user(txc.status, &utp->status) ||
923 __get_user(txc.constant, &utp->constant) ||
924 __get_user(txc.precision, &utp->precision) ||
925 __get_user(txc.tolerance, &utp->tolerance) ||
926 __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
927 __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
928 __get_user(txc.tick, &utp->tick) ||
929 __get_user(txc.ppsfreq, &utp->ppsfreq) ||
930 __get_user(txc.jitter, &utp->jitter) ||
931 __get_user(txc.shift, &utp->shift) ||
932 __get_user(txc.stabil, &utp->stabil) ||
933 __get_user(txc.jitcnt, &utp->jitcnt) ||
934 __get_user(txc.calcnt, &utp->calcnt) ||
935 __get_user(txc.errcnt, &utp->errcnt) ||
936 __get_user(txc.stbcnt, &utp->stbcnt))
937 return -EFAULT;
938
939 ret = do_adjtimex(&txc);
940
941 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
942 __put_user(txc.modes, &utp->modes) ||
943 __put_user(txc.offset, &utp->offset) ||
944 __put_user(txc.freq, &utp->freq) ||
945 __put_user(txc.maxerror, &utp->maxerror) ||
946 __put_user(txc.esterror, &utp->esterror) ||
947 __put_user(txc.status, &utp->status) ||
948 __put_user(txc.constant, &utp->constant) ||
949 __put_user(txc.precision, &utp->precision) ||
950 __put_user(txc.tolerance, &utp->tolerance) ||
951 __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
952 __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
953 __put_user(txc.tick, &utp->tick) ||
954 __put_user(txc.ppsfreq, &utp->ppsfreq) ||
955 __put_user(txc.jitter, &utp->jitter) ||
956 __put_user(txc.shift, &utp->shift) ||
957 __put_user(txc.stabil, &utp->stabil) ||
958 __put_user(txc.jitcnt, &utp->jitcnt) ||
959 __put_user(txc.calcnt, &utp->calcnt) ||
960 __put_user(txc.errcnt, &utp->errcnt) ||
961 __put_user(txc.stbcnt, &utp->stbcnt))
962 ret = -EFAULT;
963
964 return ret;
965}
1b2db9fb
CL		 966
967#ifdef CONFIG_NUMA
968asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 969 compat_uptr_t __user *pages32,
1b2db9fb
CL		 970 const int __user *nodes,
971 int __user *status,
972 int flags)
973{
974 const void __user * __user *pages;
975 int i;
976
977 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
978 for (i = 0; i < nr_pages; i++) {
979 compat_uptr_t p;
980
9216dfad 981 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 982 put_user(compat_ptr(p), pages + i))
983 return -EFAULT;
984 }
985 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
986}
987#endif
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