Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/kernel/compat.c

  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 */
 20 #include <linux/syscalls.h>
 21 #include <linux/unistd.h>
 22 #include <linux/security.h>
 23 #include <linux/timex.h>
 24 #include <linux/export.h>
 25 #include <linux/migrate.h>
 26 #include <linux/posix-timers.h>
 27 #include <linux/times.h>
 28 #include <linux/ptrace.h>
 29 #include <linux/gfp.h>
 30 
 31 #include <linux/uaccess.h>
 32 
 33 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
 34 {
 35         memset(txc, 0, sizeof(struct timex));
 36 
 37         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 38                         __get_user(txc->modes, &utp->modes) ||
 39                         __get_user(txc->offset, &utp->offset) ||
 40                         __get_user(txc->freq, &utp->freq) ||
 41                         __get_user(txc->maxerror, &utp->maxerror) ||
 42                         __get_user(txc->esterror, &utp->esterror) ||
 43                         __get_user(txc->status, &utp->status) ||
 44                         __get_user(txc->constant, &utp->constant) ||
 45                         __get_user(txc->precision, &utp->precision) ||
 46                         __get_user(txc->tolerance, &utp->tolerance) ||
 47                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
 48                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 49                         __get_user(txc->tick, &utp->tick) ||
 50                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
 51                         __get_user(txc->jitter, &utp->jitter) ||
 52                         __get_user(txc->shift, &utp->shift) ||
 53                         __get_user(txc->stabil, &utp->stabil) ||
 54                         __get_user(txc->jitcnt, &utp->jitcnt) ||
 55                         __get_user(txc->calcnt, &utp->calcnt) ||
 56                         __get_user(txc->errcnt, &utp->errcnt) ||
 57                         __get_user(txc->stbcnt, &utp->stbcnt))
 58                 return -EFAULT;
 59 
 60         return 0;
 61 }
 62 
 63 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
 64 {
 65         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 66                         __put_user(txc->modes, &utp->modes) ||
 67                         __put_user(txc->offset, &utp->offset) ||
 68                         __put_user(txc->freq, &utp->freq) ||
 69                         __put_user(txc->maxerror, &utp->maxerror) ||
 70                         __put_user(txc->esterror, &utp->esterror) ||
 71                         __put_user(txc->status, &utp->status) ||
 72                         __put_user(txc->constant, &utp->constant) ||
 73                         __put_user(txc->precision, &utp->precision) ||
 74                         __put_user(txc->tolerance, &utp->tolerance) ||
 75                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
 76                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 77                         __put_user(txc->tick, &utp->tick) ||
 78                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
 79                         __put_user(txc->jitter, &utp->jitter) ||
 80                         __put_user(txc->shift, &utp->shift) ||
 81                         __put_user(txc->stabil, &utp->stabil) ||
 82                         __put_user(txc->jitcnt, &utp->jitcnt) ||
 83                         __put_user(txc->calcnt, &utp->calcnt) ||
 84                         __put_user(txc->errcnt, &utp->errcnt) ||
 85                         __put_user(txc->stbcnt, &utp->stbcnt) ||
 86                         __put_user(txc->tai, &utp->tai))
 87                 return -EFAULT;
 88         return 0;
 89 }
 90 
 91 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
 92                        struct timezone __user *, tz)
 93 {
 94         if (tv) {
 95                 struct timeval ktv;
 96                 do_gettimeofday(&ktv);
 97                 if (compat_put_timeval(&ktv, tv))
 98                         return -EFAULT;
 99         }
100         if (tz) {
101                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
102                         return -EFAULT;
103         }
104 
105         return 0;
106 }
107 
108 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109                        struct timezone __user *, tz)
110 {
111         struct timeval user_tv;
112         struct timespec new_ts;
113         struct timezone new_tz;
114 
115         if (tv) {
116                 if (compat_get_timeval(&user_tv, tv))
117                         return -EFAULT;
118                 new_ts.tv_sec = user_tv.tv_sec;
119                 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
120         }
121         if (tz) {
122                 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
123                         return -EFAULT;
124         }
125 
126         return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
127 }
128 
129 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
130 {
131         return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
132                         __get_user(tv->tv_sec, &ctv->tv_sec) ||
133                         __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
134 }
135 
136 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
137 {
138         return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
139                         __put_user(tv->tv_sec, &ctv->tv_sec) ||
140                         __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
141 }
142 
143 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
144 {
145         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
146                         __get_user(ts->tv_sec, &cts->tv_sec) ||
147                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
148 }
149 
150 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
151 {
152         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
153                         __put_user(ts->tv_sec, &cts->tv_sec) ||
154                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
155 }
156 
157 int compat_get_timeval(struct timeval *tv, const void __user *utv)
158 {
159         if (COMPAT_USE_64BIT_TIME)
160                 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
161         else
162                 return __compat_get_timeval(tv, utv);
163 }
164 EXPORT_SYMBOL_GPL(compat_get_timeval);
165 
166 int compat_put_timeval(const struct timeval *tv, void __user *utv)
167 {
168         if (COMPAT_USE_64BIT_TIME)
169                 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
170         else
171                 return __compat_put_timeval(tv, utv);
172 }
173 EXPORT_SYMBOL_GPL(compat_put_timeval);
174 
175 int compat_get_timespec(struct timespec *ts, const void __user *uts)
176 {
177         if (COMPAT_USE_64BIT_TIME)
178                 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
179         else
180                 return __compat_get_timespec(ts, uts);
181 }
182 EXPORT_SYMBOL_GPL(compat_get_timespec);
183 
184 int compat_put_timespec(const struct timespec *ts, void __user *uts)
185 {
186         if (COMPAT_USE_64BIT_TIME)
187                 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
188         else
189                 return __compat_put_timespec(ts, uts);
190 }
191 EXPORT_SYMBOL_GPL(compat_put_timespec);
192 
193 int compat_convert_timespec(struct timespec __user **kts,
194                             const void __user *cts)
195 {
196         struct timespec ts;
197         struct timespec __user *uts;
198 
199         if (!cts || COMPAT_USE_64BIT_TIME) {
200                 *kts = (struct timespec __user *)cts;
201                 return 0;
202         }
203 
204         uts = compat_alloc_user_space(sizeof(ts));
205         if (!uts)
206                 return -EFAULT;
207         if (compat_get_timespec(&ts, cts))
208                 return -EFAULT;
209         if (copy_to_user(uts, &ts, sizeof(ts)))
210                 return -EFAULT;
211 
212         *kts = uts;
213         return 0;
214 }
215 
216 static long compat_nanosleep_restart(struct restart_block *restart)
217 {
218         struct compat_timespec __user *rmtp;
219         struct timespec rmt;
220         mm_segment_t oldfs;
221         long ret;
222 
223         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
224         oldfs = get_fs();
225         set_fs(KERNEL_DS);
226         ret = hrtimer_nanosleep_restart(restart);
227         set_fs(oldfs);
228 
229         if (ret == -ERESTART_RESTARTBLOCK) {
230                 rmtp = restart->nanosleep.compat_rmtp;
231 
232                 if (rmtp && compat_put_timespec(&rmt, rmtp))
233                         return -EFAULT;
234         }
235 
236         return ret;
237 }
238 
239 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240                        struct compat_timespec __user *, rmtp)
241 {
242         struct timespec tu, rmt;
243         mm_segment_t oldfs;
244         long ret;
245 
246         if (compat_get_timespec(&tu, rqtp))
247                 return -EFAULT;
248 
249         if (!timespec_valid(&tu))
250                 return -EINVAL;
251 
252         oldfs = get_fs();
253         set_fs(KERNEL_DS);
254         ret = hrtimer_nanosleep(&tu,
255                                 rmtp ? (struct timespec __user *)&rmt : NULL,
256                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
257         set_fs(oldfs);
258 
259         /*
260          * hrtimer_nanosleep() can only return 0 or
261          * -ERESTART_RESTARTBLOCK here because:
262          *
263          * - we call it with HRTIMER_MODE_REL and therefor exclude the
264          *   -ERESTARTNOHAND return path.
265          *
266          * - we supply the rmtp argument from the task stack (due to
267          *   the necessary compat conversion. So the update cannot
268          *   fail, which excludes the -EFAULT return path as well. If
269          *   it fails nevertheless we have a bigger problem and wont
270          *   reach this place anymore.
271          *
272          * - if the return value is 0, we do not have to update rmtp
273          *    because there is no remaining time.
274          *
275          * We check for -ERESTART_RESTARTBLOCK nevertheless if the
276          * core implementation decides to return random nonsense.
277          */
278         if (ret == -ERESTART_RESTARTBLOCK) {
279                 struct restart_block *restart = &current->restart_block;
280 
281                 restart->fn = compat_nanosleep_restart;
282                 restart->nanosleep.compat_rmtp = rmtp;
283 
284                 if (rmtp && compat_put_timespec(&rmt, rmtp))
285                         return -EFAULT;
286         }
287         return ret;
288 }
289 
290 static inline long get_compat_itimerval(struct itimerval *o,
291                 struct compat_itimerval __user *i)
292 {
293         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
294                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
295                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
296                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
297                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
298 }
299 
300 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
301                 struct itimerval *i)
302 {
303         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
304                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
305                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
306                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
307                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
308 }
309 
310 asmlinkage long sys_ni_posix_timers(void);
311 
312 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
313                 struct compat_itimerval __user *, it)
314 {
315         struct itimerval kit;
316         int error;
317 
318         if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
319                 return sys_ni_posix_timers();
320 
321         error = do_getitimer(which, &kit);
322         if (!error && put_compat_itimerval(it, &kit))
323                 error = -EFAULT;
324         return error;
325 }
326 
327 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
328                 struct compat_itimerval __user *, in,
329                 struct compat_itimerval __user *, out)
330 {
331         struct itimerval kin, kout;
332         int error;
333 
334         if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
335                 return sys_ni_posix_timers();
336 
337         if (in) {
338                 if (get_compat_itimerval(&kin, in))
339                         return -EFAULT;
340         } else
341                 memset(&kin, 0, sizeof(kin));
342 
343         error = do_setitimer(which, &kin, out ? &kout : NULL);
344         if (error || !out)
345                 return error;
346         if (put_compat_itimerval(out, &kout))
347                 return -EFAULT;
348         return 0;
349 }
350 
351 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
352 {
353         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
354 }
355 
356 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
357 {
358         if (tbuf) {
359                 struct tms tms;
360                 struct compat_tms tmp;
361 
362                 do_sys_times(&tms);
363                 /* Convert our struct tms to the compat version. */
364                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
365                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
366                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
367                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
368                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
369                         return -EFAULT;
370         }
371         force_successful_syscall_return();
372         return compat_jiffies_to_clock_t(jiffies);
373 }
374 
375 #ifdef __ARCH_WANT_SYS_SIGPENDING
376 
377 /*
378  * Assumption: old_sigset_t and compat_old_sigset_t are both
379  * types that can be passed to put_user()/get_user().
380  */
381 
382 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
383 {
384         old_sigset_t s;
385         long ret;
386         mm_segment_t old_fs = get_fs();
387 
388         set_fs(KERNEL_DS);
389         ret = sys_sigpending((old_sigset_t __user *) &s);
390         set_fs(old_fs);
391         if (ret == 0)
392                 ret = put_user(s, set);
393         return ret;
394 }
395 
396 #endif
397 
398 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
399 
400 /*
401  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
402  * blocked set of signals to the supplied signal set
403  */
404 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
405 {
406         memcpy(blocked->sig, &set, sizeof(set));
407 }
408 
409 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
410                        compat_old_sigset_t __user *, nset,
411                        compat_old_sigset_t __user *, oset)
412 {
413         old_sigset_t old_set, new_set;
414         sigset_t new_blocked;
415 
416         old_set = current->blocked.sig[0];
417 
418         if (nset) {
419                 if (get_user(new_set, nset))
420                         return -EFAULT;
421                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
422 
423                 new_blocked = current->blocked;
424 
425                 switch (how) {
426                 case SIG_BLOCK:
427                         sigaddsetmask(&new_blocked, new_set);
428                         break;
429                 case SIG_UNBLOCK:
430                         sigdelsetmask(&new_blocked, new_set);
431                         break;
432                 case SIG_SETMASK:
433                         compat_sig_setmask(&new_blocked, new_set);
434                         break;
435                 default:
436                         return -EINVAL;
437                 }
438 
439                 set_current_blocked(&new_blocked);
440         }
441 
442         if (oset) {
443                 if (put_user(old_set, oset))
444                         return -EFAULT;
445         }
446 
447         return 0;
448 }
449 
450 #endif
451 
452 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
453                        struct compat_rlimit __user *, rlim)
454 {
455         struct rlimit r;
456 
457         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
458             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
459             __get_user(r.rlim_max, &rlim->rlim_max))
460                 return -EFAULT;
461 
462         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
463                 r.rlim_cur = RLIM_INFINITY;
464         if (r.rlim_max == COMPAT_RLIM_INFINITY)
465                 r.rlim_max = RLIM_INFINITY;
466         return do_prlimit(current, resource, &r, NULL);
467 }
468 
469 #ifdef COMPAT_RLIM_OLD_INFINITY
470 
471 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
472                        struct compat_rlimit __user *, rlim)
473 {
474         struct rlimit r;
475         int ret;
476         mm_segment_t old_fs = get_fs();
477 
478         set_fs(KERNEL_DS);
479         ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
480         set_fs(old_fs);
481 
482         if (!ret) {
483                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
484                         r.rlim_cur = COMPAT_RLIM_INFINITY;
485                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
486                         r.rlim_max = COMPAT_RLIM_INFINITY;
487 
488                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
489                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
490                     __put_user(r.rlim_max, &rlim->rlim_max))
491                         return -EFAULT;
492         }
493         return ret;
494 }
495 
496 #endif
497 
498 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
499                        struct compat_rlimit __user *, rlim)
500 {
501         struct rlimit r;
502         int ret;
503 
504         ret = do_prlimit(current, resource, NULL, &r);
505         if (!ret) {
506                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
507                         r.rlim_cur = COMPAT_RLIM_INFINITY;
508                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
509                         r.rlim_max = COMPAT_RLIM_INFINITY;
510 
511                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
512                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
513                     __put_user(r.rlim_max, &rlim->rlim_max))
514                         return -EFAULT;
515         }
516         return ret;
517 }
518 
519 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
520 {
521         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
522             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
523             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
524             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
525             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
526             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
527             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
528             __put_user(r->ru_idrss, &ru->ru_idrss) ||
529             __put_user(r->ru_isrss, &ru->ru_isrss) ||
530             __put_user(r->ru_minflt, &ru->ru_minflt) ||
531             __put_user(r->ru_majflt, &ru->ru_majflt) ||
532             __put_user(r->ru_nswap, &ru->ru_nswap) ||
533             __put_user(r->ru_inblock, &ru->ru_inblock) ||
534             __put_user(r->ru_oublock, &ru->ru_oublock) ||
535             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
536             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
537             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
538             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
539             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
540                 return -EFAULT;
541         return 0;
542 }
543 
544 COMPAT_SYSCALL_DEFINE4(wait4,
545         compat_pid_t, pid,
546         compat_uint_t __user *, stat_addr,
547         int, options,
548         struct compat_rusage __user *, ru)
549 {
550         if (!ru) {
551                 return sys_wait4(pid, stat_addr, options, NULL);
552         } else {
553                 struct rusage r;
554                 int ret;
555                 unsigned int status;
556                 mm_segment_t old_fs = get_fs();
557 
558                 set_fs (KERNEL_DS);
559                 ret = sys_wait4(pid,
560                                 (stat_addr ?
561                                  (unsigned int __user *) &status : NULL),
562                                 options, (struct rusage __user *) &r);
563                 set_fs (old_fs);
564 
565                 if (ret > 0) {
566                         if (put_compat_rusage(&r, ru))
567                                 return -EFAULT;
568                         if (stat_addr && put_user(status, stat_addr))
569                                 return -EFAULT;
570                 }
571                 return ret;
572         }
573 }
574 
575 COMPAT_SYSCALL_DEFINE5(waitid,
576                 int, which, compat_pid_t, pid,
577                 struct compat_siginfo __user *, uinfo, int, options,
578                 struct compat_rusage __user *, uru)
579 {
580         siginfo_t info;
581         struct rusage ru;
582         long ret;
583         mm_segment_t old_fs = get_fs();
584 
585         memset(&info, 0, sizeof(info));
586 
587         set_fs(KERNEL_DS);
588         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
589                          uru ? (struct rusage __user *)&ru : NULL);
590         set_fs(old_fs);
591 
592         if ((ret < 0) || (info.si_signo == 0))
593                 return ret;
594 
595         if (uru) {
596                 /* sys_waitid() overwrites everything in ru */
597                 if (COMPAT_USE_64BIT_TIME)
598                         ret = copy_to_user(uru, &ru, sizeof(ru));
599                 else
600                         ret = put_compat_rusage(&ru, uru);
601                 if (ret)
602                         return -EFAULT;
603         }
604 
605         BUG_ON(info.si_code & __SI_MASK);
606         info.si_code |= __SI_CHLD;
607         return copy_siginfo_to_user32(uinfo, &info);
608 }
609 
610 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
611                                     unsigned len, struct cpumask *new_mask)
612 {
613         unsigned long *k;
614 
615         if (len < cpumask_size())
616                 memset(new_mask, 0, cpumask_size());
617         else if (len > cpumask_size())
618                 len = cpumask_size();
619 
620         k = cpumask_bits(new_mask);
621         return compat_get_bitmap(k, user_mask_ptr, len * 8);
622 }
623 
624 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
625                        unsigned int, len,
626                        compat_ulong_t __user *, user_mask_ptr)
627 {
628         cpumask_var_t new_mask;
629         int retval;
630 
631         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
632                 return -ENOMEM;
633 
634         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
635         if (retval)
636                 goto out;
637 
638         retval = sched_setaffinity(pid, new_mask);
639 out:
640         free_cpumask_var(new_mask);
641         return retval;
642 }
643 
644 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t,  pid, unsigned int, len,
645                        compat_ulong_t __user *, user_mask_ptr)
646 {
647         int ret;
648         cpumask_var_t mask;
649 
650         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
651                 return -EINVAL;
652         if (len & (sizeof(compat_ulong_t)-1))
653                 return -EINVAL;
654 
655         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
656                 return -ENOMEM;
657 
658         ret = sched_getaffinity(pid, mask);
659         if (ret == 0) {
660                 size_t retlen = min_t(size_t, len, cpumask_size());
661 
662                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
663                         ret = -EFAULT;
664                 else
665                         ret = retlen;
666         }
667         free_cpumask_var(mask);
668 
669         return ret;
670 }
671 
672 int get_compat_itimerspec(struct itimerspec *dst,
673                           const struct compat_itimerspec __user *src)
674 {
675         if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
676             __compat_get_timespec(&dst->it_value, &src->it_value))
677                 return -EFAULT;
678         return 0;
679 }
680 
681 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
682                           const struct itimerspec *src)
683 {
684         if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
685             __compat_put_timespec(&src->it_value, &dst->it_value))
686                 return -EFAULT;
687         return 0;
688 }
689 
690 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
691                        struct compat_sigevent __user *, timer_event_spec,
692                        timer_t __user *, created_timer_id)
693 {
694         struct sigevent __user *event = NULL;
695 
696         if (timer_event_spec) {
697                 struct sigevent kevent;
698 
699                 event = compat_alloc_user_space(sizeof(*event));
700                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
701                     copy_to_user(event, &kevent, sizeof(*event)))
702                         return -EFAULT;
703         }
704 
705         return sys_timer_create(which_clock, event, created_timer_id);
706 }
707 
708 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
709                        struct compat_itimerspec __user *, new,
710                        struct compat_itimerspec __user *, old)
711 {
712         long err;
713         mm_segment_t oldfs;
714         struct itimerspec newts, oldts;
715 
716         if (!new)
717                 return -EINVAL;
718         if (get_compat_itimerspec(&newts, new))
719                 return -EFAULT;
720         oldfs = get_fs();
721         set_fs(KERNEL_DS);
722         err = sys_timer_settime(timer_id, flags,
723                                 (struct itimerspec __user *) &newts,
724                                 (struct itimerspec __user *) &oldts);
725         set_fs(oldfs);
726         if (!err && old && put_compat_itimerspec(old, &oldts))
727                 return -EFAULT;
728         return err;
729 }
730 
731 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
732                        struct compat_itimerspec __user *, setting)
733 {
734         long err;
735         mm_segment_t oldfs;
736         struct itimerspec ts;
737 
738         oldfs = get_fs();
739         set_fs(KERNEL_DS);
740         err = sys_timer_gettime(timer_id,
741                                 (struct itimerspec __user *) &ts);
742         set_fs(oldfs);
743         if (!err && put_compat_itimerspec(setting, &ts))
744                 return -EFAULT;
745         return err;
746 }
747 
748 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
749                        struct compat_timespec __user *, tp)
750 {
751         long err;
752         mm_segment_t oldfs;
753         struct timespec ts;
754 
755         if (compat_get_timespec(&ts, tp))
756                 return -EFAULT;
757         oldfs = get_fs();
758         set_fs(KERNEL_DS);
759         err = sys_clock_settime(which_clock,
760                                 (struct timespec __user *) &ts);
761         set_fs(oldfs);
762         return err;
763 }
764 
765 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
766                        struct compat_timespec __user *, tp)
767 {
768         long err;
769         mm_segment_t oldfs;
770         struct timespec ts;
771 
772         oldfs = get_fs();
773         set_fs(KERNEL_DS);
774         err = sys_clock_gettime(which_clock,
775                                 (struct timespec __user *) &ts);
776         set_fs(oldfs);
777         if (!err && compat_put_timespec(&ts, tp))
778                 return -EFAULT;
779         return err;
780 }
781 
782 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
783                        struct compat_timex __user *, utp)
784 {
785         struct timex txc;
786         mm_segment_t oldfs;
787         int err, ret;
788 
789         err = compat_get_timex(&txc, utp);
790         if (err)
791                 return err;
792 
793         oldfs = get_fs();
794         set_fs(KERNEL_DS);
795         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
796         set_fs(oldfs);
797 
798         err = compat_put_timex(utp, &txc);
799         if (err)
800                 return err;
801 
802         return ret;
803 }
804 
805 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
806                        struct compat_timespec __user *, tp)
807 {
808         long err;
809         mm_segment_t oldfs;
810         struct timespec ts;
811 
812         oldfs = get_fs();
813         set_fs(KERNEL_DS);
814         err = sys_clock_getres(which_clock,
815                                (struct timespec __user *) &ts);
816         set_fs(oldfs);
817         if (!err && tp && compat_put_timespec(&ts, tp))
818                 return -EFAULT;
819         return err;
820 }
821 
822 static long compat_clock_nanosleep_restart(struct restart_block *restart)
823 {
824         long err;
825         mm_segment_t oldfs;
826         struct timespec tu;
827         struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
828 
829         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
830         oldfs = get_fs();
831         set_fs(KERNEL_DS);
832         err = clock_nanosleep_restart(restart);
833         set_fs(oldfs);
834 
835         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
836             compat_put_timespec(&tu, rmtp))
837                 return -EFAULT;
838 
839         if (err == -ERESTART_RESTARTBLOCK) {
840                 restart->fn = compat_clock_nanosleep_restart;
841                 restart->nanosleep.compat_rmtp = rmtp;
842         }
843         return err;
844 }
845 
846 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
847                        struct compat_timespec __user *, rqtp,
848                        struct compat_timespec __user *, rmtp)
849 {
850         long err;
851         mm_segment_t oldfs;
852         struct timespec in, out;
853         struct restart_block *restart;
854 
855         if (compat_get_timespec(&in, rqtp))
856                 return -EFAULT;
857 
858         oldfs = get_fs();
859         set_fs(KERNEL_DS);
860         err = sys_clock_nanosleep(which_clock, flags,
861                                   (struct timespec __user *) &in,
862                                   (struct timespec __user *) &out);
863         set_fs(oldfs);
864 
865         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
866             compat_put_timespec(&out, rmtp))
867                 return -EFAULT;
868 
869         if (err == -ERESTART_RESTARTBLOCK) {
870                 restart = &current->restart_block;
871                 restart->fn = compat_clock_nanosleep_restart;
872                 restart->nanosleep.compat_rmtp = rmtp;
873         }
874         return err;
875 }
876 
877 /*
878  * We currently only need the following fields from the sigevent
879  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
880  * sigev_notify_thread_id).  The others are handled in user mode.
881  * We also assume that copying sigev_value.sival_int is sufficient
882  * to keep all the bits of sigev_value.sival_ptr intact.
883  */
884 int get_compat_sigevent(struct sigevent *event,
885                 const struct compat_sigevent __user *u_event)
886 {
887         memset(event, 0, sizeof(*event));
888         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
889                 __get_user(event->sigev_value.sival_int,
890                         &u_event->sigev_value.sival_int) ||
891                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
892                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
893                 __get_user(event->sigev_notify_thread_id,
894                         &u_event->sigev_notify_thread_id))
895                 ? -EFAULT : 0;
896 }
897 
898 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
899                        unsigned long bitmap_size)
900 {
901         int i, j;
902         unsigned long m;
903         compat_ulong_t um;
904         unsigned long nr_compat_longs;
905 
906         /* align bitmap up to nearest compat_long_t boundary */
907         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
908 
909         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
910                 return -EFAULT;
911 
912         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
913 
914         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
915                 m = 0;
916 
917                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
918                         /*
919                          * We dont want to read past the end of the userspace
920                          * bitmap. We must however ensure the end of the
921                          * kernel bitmap is zeroed.
922                          */
923                         if (nr_compat_longs) {
924                                 nr_compat_longs--;
925                                 if (__get_user(um, umask))
926                                         return -EFAULT;
927                         } else {
928                                 um = 0;
929                         }
930 
931                         umask++;
932                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
933                 }
934                 *mask++ = m;
935         }
936 
937         return 0;
938 }
939 
940 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
941                        unsigned long bitmap_size)
942 {
943         int i, j;
944         unsigned long m;
945         compat_ulong_t um;
946         unsigned long nr_compat_longs;
947 
948         /* align bitmap up to nearest compat_long_t boundary */
949         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
950 
951         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
952                 return -EFAULT;
953 
954         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
955 
956         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
957                 m = *mask++;
958 
959                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
960                         um = m;
961 
962                         /*
963                          * We dont want to write past the end of the userspace
964                          * bitmap.
965                          */
966                         if (nr_compat_longs) {
967                                 nr_compat_longs--;
968                                 if (__put_user(um, umask))
969                                         return -EFAULT;
970                         }
971 
972                         umask++;
973                         m >>= 4*sizeof(um);
974                         m >>= 4*sizeof(um);
975                 }
976         }
977 
978         return 0;
979 }
980 
981 void
982 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
983 {
984         switch (_NSIG_WORDS) {
985         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
986         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
987         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
988         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
989         }
990 }
991 EXPORT_SYMBOL_GPL(sigset_from_compat);
992 
993 void
994 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
995 {
996         switch (_NSIG_WORDS) {
997         case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
998         case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
999         case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
1000         case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
1001         }
1002 }
1003 
1004 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
1005                 struct compat_siginfo __user *, uinfo,
1006                 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1007 {
1008         compat_sigset_t s32;
1009         sigset_t s;
1010         struct timespec t;
1011         siginfo_t info;
1012         long ret;
1013 
1014         if (sigsetsize != sizeof(sigset_t))
1015                 return -EINVAL;
1016 
1017         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1018                 return -EFAULT;
1019         sigset_from_compat(&s, &s32);
1020 
1021         if (uts) {
1022                 if (compat_get_timespec(&t, uts))
1023                         return -EFAULT;
1024         }
1025 
1026         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1027 
1028         if (ret > 0 && uinfo) {
1029                 if (copy_siginfo_to_user32(uinfo, &info))
1030                         ret = -EFAULT;
1031         }
1032 
1033         return ret;
1034 }
1035 
1036 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1037 
1038 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1039 
1040 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1041 {
1042         compat_time_t i;
1043         struct timeval tv;
1044 
1045         do_gettimeofday(&tv);
1046         i = tv.tv_sec;
1047 
1048         if (tloc) {
1049                 if (put_user(i,tloc))
1050                         return -EFAULT;
1051         }
1052         force_successful_syscall_return();
1053         return i;
1054 }
1055 
1056 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1057 {
1058         struct timespec tv;
1059         int err;
1060 
1061         if (get_user(tv.tv_sec, tptr))
1062                 return -EFAULT;
1063 
1064         tv.tv_nsec = 0;
1065 
1066         err = security_settime(&tv, NULL);
1067         if (err)
1068                 return err;
1069 
1070         do_settimeofday(&tv);
1071         return 0;
1072 }
1073 
1074 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1075 
1076 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1077 {
1078         struct timex txc;
1079         int err, ret;
1080 
1081         err = compat_get_timex(&txc, utp);
1082         if (err)
1083                 return err;
1084 
1085         ret = do_adjtimex(&txc);
1086 
1087         err = compat_put_timex(utp, &txc);
1088         if (err)
1089                 return err;
1090 
1091         return ret;
1092 }
1093 
1094 #ifdef CONFIG_NUMA
1095 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1096                        compat_uptr_t __user *, pages32,
1097                        const int __user *, nodes,
1098                        int __user *, status,
1099                        int, flags)
1100 {
1101         const void __user * __user *pages;
1102         int i;
1103 
1104         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1105         for (i = 0; i < nr_pages; i++) {
1106                 compat_uptr_t p;
1107 
1108                 if (get_user(p, pages32 + i) ||
1109                         put_user(compat_ptr(p), pages + i))
1110                         return -EFAULT;
1111         }
1112         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1113 }
1114 
1115 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1116                        compat_ulong_t, maxnode,
1117                        const compat_ulong_t __user *, old_nodes,
1118                        const compat_ulong_t __user *, new_nodes)
1119 {
1120         unsigned long __user *old = NULL;
1121         unsigned long __user *new = NULL;
1122         nodemask_t tmp_mask;
1123         unsigned long nr_bits;
1124         unsigned long size;
1125 
1126         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1127         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1128         if (old_nodes) {
1129                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1130                         return -EFAULT;
1131                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1132                 if (new_nodes)
1133                         new = old + size / sizeof(unsigned long);
1134                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1135                         return -EFAULT;
1136         }
1137         if (new_nodes) {
1138                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1139                         return -EFAULT;
1140                 if (new == NULL)
1141                         new = compat_alloc_user_space(size);
1142                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1143                         return -EFAULT;
1144         }
1145         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1146 }
1147 #endif
1148 
1149 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1150                        compat_pid_t, pid,
1151                        struct compat_timespec __user *, interval)
1152 {
1153         struct timespec t;
1154         int ret;
1155         mm_segment_t old_fs = get_fs();
1156 
1157         set_fs(KERNEL_DS);
1158         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1159         set_fs(old_fs);
1160         if (compat_put_timespec(&t, interval))
1161                 return -EFAULT;
1162         return ret;
1163 }
1164 
1165 /*
1166  * Allocate user-space memory for the duration of a single system call,
1167  * in order to marshall parameters inside a compat thunk.
1168  */
1169 void __user *compat_alloc_user_space(unsigned long len)
1170 {
1171         void __user *ptr;
1172 
1173         /* If len would occupy more than half of the entire compat space... */
1174         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1175                 return NULL;
1176 
1177         ptr = arch_compat_alloc_user_space(len);
1178 
1179         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1180                 return NULL;
1181 
1182         return ptr;
1183 }
1184 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1185 

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