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TOMOYO Linux Cross Reference
Linux/kernel/compat.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/migrate.h>
 25 #include <linux/posix-timers.h>
 26 #include <linux/times.h>
 27 #include <linux/ptrace.h>
 28 #include <linux/module.h>
 29 
 30 #include <asm/uaccess.h>
 31 
 32 /*
 33  * Note that the native side is already converted to a timespec, because
 34  * that's what we want anyway.
 35  */
 36 static 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 
 48 static 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 
 55 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
 56                 struct timezone __user *tz)
 57 {
 58         if (tv) {
 59                 struct timeval ktv;
 60                 do_gettimeofday(&ktv);
 61                 if (compat_put_timeval(tv, &ktv))
 62                         return -EFAULT;
 63         }
 64         if (tz) {
 65                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 66                         return -EFAULT;
 67         }
 68 
 69         return 0;
 70 }
 71 
 72 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 73                 struct timezone __user *tz)
 74 {
 75         struct timespec kts;
 76         struct timezone ktz;
 77 
 78         if (tv) {
 79                 if (compat_get_timeval(&kts, tv))
 80                         return -EFAULT;
 81         }
 82         if (tz) {
 83                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 84                         return -EFAULT;
 85         }
 86 
 87         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 88 }
 89 
 90 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 91 {
 92         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
 93                         __get_user(ts->tv_sec, &cts->tv_sec) ||
 94                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 95 }
 96 
 97 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
 98 {
 99         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
100                         __put_user(ts->tv_sec, &cts->tv_sec) ||
101                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
102 }
103 
104 static long compat_nanosleep_restart(struct restart_block *restart)
105 {
106         struct compat_timespec __user *rmtp;
107         struct timespec rmt;
108         mm_segment_t oldfs;
109         long ret;
110 
111         restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
112         oldfs = get_fs();
113         set_fs(KERNEL_DS);
114         ret = hrtimer_nanosleep_restart(restart);
115         set_fs(oldfs);
116 
117         if (ret) {
118                 rmtp = restart->nanosleep.compat_rmtp;
119 
120                 if (rmtp && put_compat_timespec(&rmt, rmtp))
121                         return -EFAULT;
122         }
123 
124         return ret;
125 }
126 
127 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
128                                      struct compat_timespec __user *rmtp)
129 {
130         struct timespec tu, rmt;
131         mm_segment_t oldfs;
132         long ret;
133 
134         if (get_compat_timespec(&tu, rqtp))
135                 return -EFAULT;
136 
137         if (!timespec_valid(&tu))
138                 return -EINVAL;
139 
140         oldfs = get_fs();
141         set_fs(KERNEL_DS);
142         ret = hrtimer_nanosleep(&tu,
143                                 rmtp ? (struct timespec __user *)&rmt : NULL,
144                                 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
145         set_fs(oldfs);
146 
147         if (ret) {
148                 struct restart_block *restart
149                         = &current_thread_info()->restart_block;
150 
151                 restart->fn = compat_nanosleep_restart;
152                 restart->nanosleep.compat_rmtp = rmtp;
153 
154                 if (rmtp && put_compat_timespec(&rmt, rmtp))
155                         return -EFAULT;
156         }
157 
158         return ret;
159 }
160 
161 static inline long get_compat_itimerval(struct itimerval *o,
162                 struct compat_itimerval __user *i)
163 {
164         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
165                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
166                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
167                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
168                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
169 }
170 
171 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
172                 struct itimerval *i)
173 {
174         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
175                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
176                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
177                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
178                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
179 }
180 
181 asmlinkage long compat_sys_getitimer(int which,
182                 struct compat_itimerval __user *it)
183 {
184         struct itimerval kit;
185         int error;
186 
187         error = do_getitimer(which, &kit);
188         if (!error && put_compat_itimerval(it, &kit))
189                 error = -EFAULT;
190         return error;
191 }
192 
193 asmlinkage long compat_sys_setitimer(int which,
194                 struct compat_itimerval __user *in,
195                 struct compat_itimerval __user *out)
196 {
197         struct itimerval kin, kout;
198         int error;
199 
200         if (in) {
201                 if (get_compat_itimerval(&kin, in))
202                         return -EFAULT;
203         } else
204                 memset(&kin, 0, sizeof(kin));
205 
206         error = do_setitimer(which, &kin, out ? &kout : NULL);
207         if (error || !out)
208                 return error;
209         if (put_compat_itimerval(out, &kout))
210                 return -EFAULT;
211         return 0;
212 }
213 
214 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
215 {
216         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
217 }
218 
219 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
220 {
221         if (tbuf) {
222                 struct tms tms;
223                 struct compat_tms tmp;
224 
225                 do_sys_times(&tms);
226                 /* Convert our struct tms to the compat version. */
227                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
228                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
229                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
230                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
231                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
232                         return -EFAULT;
233         }
234         force_successful_syscall_return();
235         return compat_jiffies_to_clock_t(jiffies);
236 }
237 
238 /*
239  * Assumption: old_sigset_t and compat_old_sigset_t are both
240  * types that can be passed to put_user()/get_user().
241  */
242 
243 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
244 {
245         old_sigset_t s;
246         long ret;
247         mm_segment_t old_fs = get_fs();
248 
249         set_fs(KERNEL_DS);
250         ret = sys_sigpending((old_sigset_t __user *) &s);
251         set_fs(old_fs);
252         if (ret == 0)
253                 ret = put_user(s, set);
254         return ret;
255 }
256 
257 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
258                 compat_old_sigset_t __user *oset)
259 {
260         old_sigset_t s;
261         long ret;
262         mm_segment_t old_fs;
263 
264         if (set && get_user(s, set))
265                 return -EFAULT;
266         old_fs = get_fs();
267         set_fs(KERNEL_DS);
268         ret = sys_sigprocmask(how,
269                               set ? (old_sigset_t __user *) &s : NULL,
270                               oset ? (old_sigset_t __user *) &s : NULL);
271         set_fs(old_fs);
272         if (ret == 0)
273                 if (oset)
274                         ret = put_user(s, oset);
275         return ret;
276 }
277 
278 asmlinkage long compat_sys_setrlimit(unsigned int resource,
279                 struct compat_rlimit __user *rlim)
280 {
281         struct rlimit r;
282         int ret;
283         mm_segment_t old_fs = get_fs ();
284 
285         if (resource >= RLIM_NLIMITS)
286                 return -EINVAL;
287 
288         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
289             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
290             __get_user(r.rlim_max, &rlim->rlim_max))
291                 return -EFAULT;
292 
293         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
294                 r.rlim_cur = RLIM_INFINITY;
295         if (r.rlim_max == COMPAT_RLIM_INFINITY)
296                 r.rlim_max = RLIM_INFINITY;
297         set_fs(KERNEL_DS);
298         ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
299         set_fs(old_fs);
300         return ret;
301 }
302 
303 #ifdef COMPAT_RLIM_OLD_INFINITY
304 
305 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
306                 struct compat_rlimit __user *rlim)
307 {
308         struct rlimit r;
309         int ret;
310         mm_segment_t old_fs = get_fs();
311 
312         set_fs(KERNEL_DS);
313         ret = sys_old_getrlimit(resource, &r);
314         set_fs(old_fs);
315 
316         if (!ret) {
317                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
318                         r.rlim_cur = COMPAT_RLIM_INFINITY;
319                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
320                         r.rlim_max = COMPAT_RLIM_INFINITY;
321 
322                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
323                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
324                     __put_user(r.rlim_max, &rlim->rlim_max))
325                         return -EFAULT;
326         }
327         return ret;
328 }
329 
330 #endif
331 
332 asmlinkage long compat_sys_getrlimit (unsigned int resource,
333                 struct compat_rlimit __user *rlim)
334 {
335         struct rlimit r;
336         int ret;
337         mm_segment_t old_fs = get_fs();
338 
339         set_fs(KERNEL_DS);
340         ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
341         set_fs(old_fs);
342         if (!ret) {
343                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
344                         r.rlim_cur = COMPAT_RLIM_INFINITY;
345                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
346                         r.rlim_max = COMPAT_RLIM_INFINITY;
347 
348                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
349                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
350                     __put_user(r.rlim_max, &rlim->rlim_max))
351                         return -EFAULT;
352         }
353         return ret;
354 }
355 
356 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
357 {
358         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
359             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
360             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
361             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
362             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
363             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
364             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
365             __put_user(r->ru_idrss, &ru->ru_idrss) ||
366             __put_user(r->ru_isrss, &ru->ru_isrss) ||
367             __put_user(r->ru_minflt, &ru->ru_minflt) ||
368             __put_user(r->ru_majflt, &ru->ru_majflt) ||
369             __put_user(r->ru_nswap, &ru->ru_nswap) ||
370             __put_user(r->ru_inblock, &ru->ru_inblock) ||
371             __put_user(r->ru_oublock, &ru->ru_oublock) ||
372             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
373             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
374             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
375             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
376             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
377                 return -EFAULT;
378         return 0;
379 }
380 
381 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
382 {
383         struct rusage r;
384         int ret;
385         mm_segment_t old_fs = get_fs();
386 
387         set_fs(KERNEL_DS);
388         ret = sys_getrusage(who, (struct rusage __user *) &r);
389         set_fs(old_fs);
390 
391         if (ret)
392                 return ret;
393 
394         if (put_compat_rusage(&r, ru))
395                 return -EFAULT;
396 
397         return 0;
398 }
399 
400 asmlinkage long
401 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
402         struct compat_rusage __user *ru)
403 {
404         if (!ru) {
405                 return sys_wait4(pid, stat_addr, options, NULL);
406         } else {
407                 struct rusage r;
408                 int ret;
409                 unsigned int status;
410                 mm_segment_t old_fs = get_fs();
411 
412                 set_fs (KERNEL_DS);
413                 ret = sys_wait4(pid,
414                                 (stat_addr ?
415                                  (unsigned int __user *) &status : NULL),
416                                 options, (struct rusage __user *) &r);
417                 set_fs (old_fs);
418 
419                 if (ret > 0) {
420                         if (put_compat_rusage(&r, ru))
421                                 return -EFAULT;
422                         if (stat_addr && put_user(status, stat_addr))
423                                 return -EFAULT;
424                 }
425                 return ret;
426         }
427 }
428 
429 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
430                 struct compat_siginfo __user *uinfo, int options,
431                 struct compat_rusage __user *uru)
432 {
433         siginfo_t info;
434         struct rusage ru;
435         long ret;
436         mm_segment_t old_fs = get_fs();
437 
438         memset(&info, 0, sizeof(info));
439 
440         set_fs(KERNEL_DS);
441         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
442                          uru ? (struct rusage __user *)&ru : NULL);
443         set_fs(old_fs);
444 
445         if ((ret < 0) || (info.si_signo == 0))
446                 return ret;
447 
448         if (uru) {
449                 ret = put_compat_rusage(&ru, uru);
450                 if (ret)
451                         return ret;
452         }
453 
454         BUG_ON(info.si_code & __SI_MASK);
455         info.si_code |= __SI_CHLD;
456         return copy_siginfo_to_user32(uinfo, &info);
457 }
458 
459 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
460                                     unsigned len, struct cpumask *new_mask)
461 {
462         unsigned long *k;
463 
464         if (len < cpumask_size())
465                 memset(new_mask, 0, cpumask_size());
466         else if (len > cpumask_size())
467                 len = cpumask_size();
468 
469         k = cpumask_bits(new_mask);
470         return compat_get_bitmap(k, user_mask_ptr, len * 8);
471 }
472 
473 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
474                                              unsigned int len,
475                                              compat_ulong_t __user *user_mask_ptr)
476 {
477         cpumask_var_t new_mask;
478         int retval;
479 
480         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
481                 return -ENOMEM;
482 
483         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
484         if (retval)
485                 goto out;
486 
487         retval = sched_setaffinity(pid, new_mask);
488 out:
489         free_cpumask_var(new_mask);
490         return retval;
491 }
492 
493 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
494                                              compat_ulong_t __user *user_mask_ptr)
495 {
496         int ret;
497         cpumask_var_t mask;
498 
499         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
500                 return -EINVAL;
501         if (len & (sizeof(compat_ulong_t)-1))
502                 return -EINVAL;
503 
504         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
505                 return -ENOMEM;
506 
507         ret = sched_getaffinity(pid, mask);
508         if (ret == 0) {
509                 size_t retlen = min_t(size_t, len, cpumask_size());
510 
511                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
512                         ret = -EFAULT;
513                 else
514                         ret = retlen;
515         }
516         free_cpumask_var(mask);
517 
518         return ret;
519 }
520 
521 int get_compat_itimerspec(struct itimerspec *dst,
522                           const struct compat_itimerspec __user *src)
523 {
524         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
525             get_compat_timespec(&dst->it_value, &src->it_value))
526                 return -EFAULT;
527         return 0;
528 }
529 
530 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
531                           const struct itimerspec *src)
532 {
533         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
534             put_compat_timespec(&src->it_value, &dst->it_value))
535                 return -EFAULT;
536         return 0;
537 }
538 
539 long compat_sys_timer_create(clockid_t which_clock,
540                         struct compat_sigevent __user *timer_event_spec,
541                         timer_t __user *created_timer_id)
542 {
543         struct sigevent __user *event = NULL;
544 
545         if (timer_event_spec) {
546                 struct sigevent kevent;
547 
548                 event = compat_alloc_user_space(sizeof(*event));
549                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
550                     copy_to_user(event, &kevent, sizeof(*event)))
551                         return -EFAULT;
552         }
553 
554         return sys_timer_create(which_clock, event, created_timer_id);
555 }
556 
557 long compat_sys_timer_settime(timer_t timer_id, int flags,
558                           struct compat_itimerspec __user *new,
559                           struct compat_itimerspec __user *old)
560 {
561         long err;
562         mm_segment_t oldfs;
563         struct itimerspec newts, oldts;
564 
565         if (!new)
566                 return -EINVAL;
567         if (get_compat_itimerspec(&newts, new))
568                 return -EFAULT;
569         oldfs = get_fs();
570         set_fs(KERNEL_DS);
571         err = sys_timer_settime(timer_id, flags,
572                                 (struct itimerspec __user *) &newts,
573                                 (struct itimerspec __user *) &oldts);
574         set_fs(oldfs);
575         if (!err && old && put_compat_itimerspec(old, &oldts))
576                 return -EFAULT;
577         return err;
578 }
579 
580 long compat_sys_timer_gettime(timer_t timer_id,
581                 struct compat_itimerspec __user *setting)
582 {
583         long err;
584         mm_segment_t oldfs;
585         struct itimerspec ts;
586 
587         oldfs = get_fs();
588         set_fs(KERNEL_DS);
589         err = sys_timer_gettime(timer_id,
590                                 (struct itimerspec __user *) &ts);
591         set_fs(oldfs);
592         if (!err && put_compat_itimerspec(setting, &ts))
593                 return -EFAULT;
594         return err;
595 }
596 
597 long compat_sys_clock_settime(clockid_t which_clock,
598                 struct compat_timespec __user *tp)
599 {
600         long err;
601         mm_segment_t oldfs;
602         struct timespec ts;
603 
604         if (get_compat_timespec(&ts, tp))
605                 return -EFAULT;
606         oldfs = get_fs();
607         set_fs(KERNEL_DS);
608         err = sys_clock_settime(which_clock,
609                                 (struct timespec __user *) &ts);
610         set_fs(oldfs);
611         return err;
612 }
613 
614 long compat_sys_clock_gettime(clockid_t which_clock,
615                 struct compat_timespec __user *tp)
616 {
617         long err;
618         mm_segment_t oldfs;
619         struct timespec ts;
620 
621         oldfs = get_fs();
622         set_fs(KERNEL_DS);
623         err = sys_clock_gettime(which_clock,
624                                 (struct timespec __user *) &ts);
625         set_fs(oldfs);
626         if (!err && put_compat_timespec(&ts, tp))
627                 return -EFAULT;
628         return err;
629 }
630 
631 long compat_sys_clock_getres(clockid_t which_clock,
632                 struct compat_timespec __user *tp)
633 {
634         long err;
635         mm_segment_t oldfs;
636         struct timespec ts;
637 
638         oldfs = get_fs();
639         set_fs(KERNEL_DS);
640         err = sys_clock_getres(which_clock,
641                                (struct timespec __user *) &ts);
642         set_fs(oldfs);
643         if (!err && tp && put_compat_timespec(&ts, tp))
644                 return -EFAULT;
645         return err;
646 }
647 
648 static long compat_clock_nanosleep_restart(struct restart_block *restart)
649 {
650         long err;
651         mm_segment_t oldfs;
652         struct timespec tu;
653         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
654 
655         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
656         oldfs = get_fs();
657         set_fs(KERNEL_DS);
658         err = clock_nanosleep_restart(restart);
659         set_fs(oldfs);
660 
661         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
662             put_compat_timespec(&tu, rmtp))
663                 return -EFAULT;
664 
665         if (err == -ERESTART_RESTARTBLOCK) {
666                 restart->fn = compat_clock_nanosleep_restart;
667                 restart->nanosleep.compat_rmtp = rmtp;
668         }
669         return err;
670 }
671 
672 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
673                             struct compat_timespec __user *rqtp,
674                             struct compat_timespec __user *rmtp)
675 {
676         long err;
677         mm_segment_t oldfs;
678         struct timespec in, out;
679         struct restart_block *restart;
680 
681         if (get_compat_timespec(&in, rqtp))
682                 return -EFAULT;
683 
684         oldfs = get_fs();
685         set_fs(KERNEL_DS);
686         err = sys_clock_nanosleep(which_clock, flags,
687                                   (struct timespec __user *) &in,
688                                   (struct timespec __user *) &out);
689         set_fs(oldfs);
690 
691         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
692             put_compat_timespec(&out, rmtp))
693                 return -EFAULT;
694 
695         if (err == -ERESTART_RESTARTBLOCK) {
696                 restart = &current_thread_info()->restart_block;
697                 restart->fn = compat_clock_nanosleep_restart;
698                 restart->nanosleep.compat_rmtp = rmtp;
699         }
700         return err;
701 }
702 
703 /*
704  * We currently only need the following fields from the sigevent
705  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
706  * sigev_notify_thread_id).  The others are handled in user mode.
707  * We also assume that copying sigev_value.sival_int is sufficient
708  * to keep all the bits of sigev_value.sival_ptr intact.
709  */
710 int get_compat_sigevent(struct sigevent *event,
711                 const struct compat_sigevent __user *u_event)
712 {
713         memset(event, 0, sizeof(*event));
714         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
715                 __get_user(event->sigev_value.sival_int,
716                         &u_event->sigev_value.sival_int) ||
717                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
718                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
719                 __get_user(event->sigev_notify_thread_id,
720                         &u_event->sigev_notify_thread_id))
721                 ? -EFAULT : 0;
722 }
723 
724 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
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_READ, 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 = 0;
742 
743                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
744                         /*
745                          * We dont want to read past the end of the userspace
746                          * bitmap. We must however ensure the end of the
747                          * kernel bitmap is zeroed.
748                          */
749                         if (nr_compat_longs-- > 0) {
750                                 if (__get_user(um, umask))
751                                         return -EFAULT;
752                         } else {
753                                 um = 0;
754                         }
755 
756                         umask++;
757                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
758                 }
759                 *mask++ = m;
760         }
761 
762         return 0;
763 }
764 
765 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
766                        unsigned long bitmap_size)
767 {
768         int i, j;
769         unsigned long m;
770         compat_ulong_t um;
771         unsigned long nr_compat_longs;
772 
773         /* align bitmap up to nearest compat_long_t boundary */
774         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
775 
776         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
777                 return -EFAULT;
778 
779         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
780 
781         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
782                 m = *mask++;
783 
784                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
785                         um = m;
786 
787                         /*
788                          * We dont want to write past the end of the userspace
789                          * bitmap.
790                          */
791                         if (nr_compat_longs-- > 0) {
792                                 if (__put_user(um, umask))
793                                         return -EFAULT;
794                         }
795 
796                         umask++;
797                         m >>= 4*sizeof(um);
798                         m >>= 4*sizeof(um);
799                 }
800         }
801 
802         return 0;
803 }
804 
805 void
806 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
807 {
808         switch (_NSIG_WORDS) {
809         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
810         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
811         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
812         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
813         }
814 }
815 
816 asmlinkage long
817 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
818                 struct compat_siginfo __user *uinfo,
819                 struct compat_timespec __user *uts, compat_size_t sigsetsize)
820 {
821         compat_sigset_t s32;
822         sigset_t s;
823         int sig;
824         struct timespec t;
825         siginfo_t info;
826         long ret, timeout = 0;
827 
828         if (sigsetsize != sizeof(sigset_t))
829                 return -EINVAL;
830 
831         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
832                 return -EFAULT;
833         sigset_from_compat(&s, &s32);
834         sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
835         signotset(&s);
836 
837         if (uts) {
838                 if (get_compat_timespec (&t, uts))
839                         return -EFAULT;
840                 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
841                                 || t.tv_sec < 0)
842                         return -EINVAL;
843         }
844 
845         spin_lock_irq(&current->sighand->siglock);
846         sig = dequeue_signal(current, &s, &info);
847         if (!sig) {
848                 timeout = MAX_SCHEDULE_TIMEOUT;
849                 if (uts)
850                         timeout = timespec_to_jiffies(&t)
851                                 +(t.tv_sec || t.tv_nsec);
852                 if (timeout) {
853                         current->real_blocked = current->blocked;
854                         sigandsets(&current->blocked, &current->blocked, &s);
855 
856                         recalc_sigpending();
857                         spin_unlock_irq(&current->sighand->siglock);
858 
859                         timeout = schedule_timeout_interruptible(timeout);
860 
861                         spin_lock_irq(&current->sighand->siglock);
862                         sig = dequeue_signal(current, &s, &info);
863                         current->blocked = current->real_blocked;
864                         siginitset(&current->real_blocked, 0);
865                         recalc_sigpending();
866                 }
867         }
868         spin_unlock_irq(&current->sighand->siglock);
869 
870         if (sig) {
871                 ret = sig;
872                 if (uinfo) {
873                         if (copy_siginfo_to_user32(uinfo, &info))
874                                 ret = -EFAULT;
875                 }
876         }else {
877                 ret = timeout?-EINTR:-EAGAIN;
878         }
879         return ret;
880 
881 }
882 
883 asmlinkage long
884 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
885                              struct compat_siginfo __user *uinfo)
886 {
887         siginfo_t info;
888 
889         if (copy_siginfo_from_user32(&info, uinfo))
890                 return -EFAULT;
891         return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
892 }
893 
894 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
895 
896 /* compat_time_t is a 32 bit "long" and needs to get converted. */
897 
898 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
899 {
900         compat_time_t i;
901         struct timeval tv;
902 
903         do_gettimeofday(&tv);
904         i = tv.tv_sec;
905 
906         if (tloc) {
907                 if (put_user(i,tloc))
908                         return -EFAULT;
909         }
910         force_successful_syscall_return();
911         return i;
912 }
913 
914 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
915 {
916         struct timespec tv;
917         int err;
918 
919         if (get_user(tv.tv_sec, tptr))
920                 return -EFAULT;
921 
922         tv.tv_nsec = 0;
923 
924         err = security_settime(&tv, NULL);
925         if (err)
926                 return err;
927         if (!ccs_capable(CCS_SYS_SETTIME))
928                 return -EPERM;
929 
930         do_settimeofday(&tv);
931         return 0;
932 }
933 
934 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
935 
936 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
937 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
938 {
939         sigset_t newset;
940         compat_sigset_t newset32;
941 
942         /* XXX: Don't preclude handling different sized sigset_t's.  */
943         if (sigsetsize != sizeof(sigset_t))
944                 return -EINVAL;
945 
946         if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
947                 return -EFAULT;
948         sigset_from_compat(&newset, &newset32);
949         sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
950 
951         spin_lock_irq(&current->sighand->siglock);
952         current->saved_sigmask = current->blocked;
953         current->blocked = newset;
954         recalc_sigpending();
955         spin_unlock_irq(&current->sighand->siglock);
956 
957         current->state = TASK_INTERRUPTIBLE;
958         schedule();
959         set_restore_sigmask();
960         return -ERESTARTNOHAND;
961 }
962 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
963 
964 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
965 {
966         struct timex txc;
967         int ret;
968 
969         memset(&txc, 0, sizeof(struct timex));
970 
971         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
972                         __get_user(txc.modes, &utp->modes) ||
973                         __get_user(txc.offset, &utp->offset) ||
974                         __get_user(txc.freq, &utp->freq) ||
975                         __get_user(txc.maxerror, &utp->maxerror) ||
976                         __get_user(txc.esterror, &utp->esterror) ||
977                         __get_user(txc.status, &utp->status) ||
978                         __get_user(txc.constant, &utp->constant) ||
979                         __get_user(txc.precision, &utp->precision) ||
980                         __get_user(txc.tolerance, &utp->tolerance) ||
981                         __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
982                         __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
983                         __get_user(txc.tick, &utp->tick) ||
984                         __get_user(txc.ppsfreq, &utp->ppsfreq) ||
985                         __get_user(txc.jitter, &utp->jitter) ||
986                         __get_user(txc.shift, &utp->shift) ||
987                         __get_user(txc.stabil, &utp->stabil) ||
988                         __get_user(txc.jitcnt, &utp->jitcnt) ||
989                         __get_user(txc.calcnt, &utp->calcnt) ||
990                         __get_user(txc.errcnt, &utp->errcnt) ||
991                         __get_user(txc.stbcnt, &utp->stbcnt))
992                 return -EFAULT;
993 
994         ret = do_adjtimex(&txc);
995 
996         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
997                         __put_user(txc.modes, &utp->modes) ||
998                         __put_user(txc.offset, &utp->offset) ||
999                         __put_user(txc.freq, &utp->freq) ||
1000                         __put_user(txc.maxerror, &utp->maxerror) ||
1001                         __put_user(txc.esterror, &utp->esterror) ||
1002                         __put_user(txc.status, &utp->status) ||
1003                         __put_user(txc.constant, &utp->constant) ||
1004                         __put_user(txc.precision, &utp->precision) ||
1005                         __put_user(txc.tolerance, &utp->tolerance) ||
1006                         __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
1007                         __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
1008                         __put_user(txc.tick, &utp->tick) ||
1009                         __put_user(txc.ppsfreq, &utp->ppsfreq) ||
1010                         __put_user(txc.jitter, &utp->jitter) ||
1011                         __put_user(txc.shift, &utp->shift) ||
1012                         __put_user(txc.stabil, &utp->stabil) ||
1013                         __put_user(txc.jitcnt, &utp->jitcnt) ||
1014                         __put_user(txc.calcnt, &utp->calcnt) ||
1015                         __put_user(txc.errcnt, &utp->errcnt) ||
1016                         __put_user(txc.stbcnt, &utp->stbcnt) ||
1017                         __put_user(txc.tai, &utp->tai))
1018                 ret = -EFAULT;
1019 
1020         return ret;
1021 }
1022 
1023 #ifdef CONFIG_NUMA
1024 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1025                 compat_uptr_t __user *pages32,
1026                 const int __user *nodes,
1027                 int __user *status,
1028                 int flags)
1029 {
1030         const void __user * __user *pages;
1031         int i;
1032 
1033         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1034         for (i = 0; i < nr_pages; i++) {
1035                 compat_uptr_t p;
1036 
1037                 if (get_user(p, pages32 + i) ||
1038                         put_user(compat_ptr(p), pages + i))
1039                         return -EFAULT;
1040         }
1041         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1042 }
1043 
1044 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1045                         compat_ulong_t maxnode,
1046                         const compat_ulong_t __user *old_nodes,
1047                         const compat_ulong_t __user *new_nodes)
1048 {
1049         unsigned long __user *old = NULL;
1050         unsigned long __user *new = NULL;
1051         nodemask_t tmp_mask;
1052         unsigned long nr_bits;
1053         unsigned long size;
1054 
1055         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1056         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1057         if (old_nodes) {
1058                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1059                         return -EFAULT;
1060                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1061                 if (new_nodes)
1062                         new = old + size / sizeof(unsigned long);
1063                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1064                         return -EFAULT;
1065         }
1066         if (new_nodes) {
1067                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1068                         return -EFAULT;
1069                 if (new == NULL)
1070                         new = compat_alloc_user_space(size);
1071                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1072                         return -EFAULT;
1073         }
1074         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1075 }
1076 #endif
1077 
1078 struct compat_sysinfo {
1079         s32 uptime;
1080         u32 loads[3];
1081         u32 totalram;
1082         u32 freeram;
1083         u32 sharedram;
1084         u32 bufferram;
1085         u32 totalswap;
1086         u32 freeswap;
1087         u16 procs;
1088         u16 pad;
1089         u32 totalhigh;
1090         u32 freehigh;
1091         u32 mem_unit;
1092         char _f[20-2*sizeof(u32)-sizeof(int)];
1093 };
1094 
1095 asmlinkage long
1096 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1097 {
1098         struct sysinfo s;
1099 
1100         do_sysinfo(&s);
1101 
1102         /* Check to see if any memory value is too large for 32-bit and scale
1103          *  down if needed
1104          */
1105         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1106                 int bitcount = 0;
1107 
1108                 while (s.mem_unit < PAGE_SIZE) {
1109                         s.mem_unit <<= 1;
1110                         bitcount++;
1111                 }
1112 
1113                 s.totalram >>= bitcount;
1114                 s.freeram >>= bitcount;
1115                 s.sharedram >>= bitcount;
1116                 s.bufferram >>= bitcount;
1117                 s.totalswap >>= bitcount;
1118                 s.freeswap >>= bitcount;
1119                 s.totalhigh >>= bitcount;
1120                 s.freehigh >>= bitcount;
1121         }
1122 
1123         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1124             __put_user (s.uptime, &info->uptime) ||
1125             __put_user (s.loads[0], &info->loads[0]) ||
1126             __put_user (s.loads[1], &info->loads[1]) ||
1127             __put_user (s.loads[2], &info->loads[2]) ||
1128             __put_user (s.totalram, &info->totalram) ||
1129             __put_user (s.freeram, &info->freeram) ||
1130             __put_user (s.sharedram, &info->sharedram) ||
1131             __put_user (s.bufferram, &info->bufferram) ||
1132             __put_user (s.totalswap, &info->totalswap) ||
1133             __put_user (s.freeswap, &info->freeswap) ||
1134             __put_user (s.procs, &info->procs) ||
1135             __put_user (s.totalhigh, &info->totalhigh) ||
1136             __put_user (s.freehigh, &info->freehigh) ||
1137             __put_user (s.mem_unit, &info->mem_unit))
1138                 return -EFAULT;
1139 
1140         return 0;
1141 }
1142 
1143 /*
1144  * Allocate user-space memory for the duration of a single system call,
1145  * in order to marshall parameters inside a compat thunk.
1146  */
1147 void __user *compat_alloc_user_space(unsigned long len)
1148 {
1149         void __user *ptr;
1150 
1151         /* If len would occupy more than half of the entire compat space... */
1152         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1153                 return NULL;
1154 
1155         ptr = arch_compat_alloc_user_space(len);
1156 
1157         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1158                 return NULL;
1159 
1160         return ptr;
1161 }
1162 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1163 

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