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TOMOYO Linux Cross Reference
Linux/kernel/compat.c

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ 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-3.16.81 ] ~ [ 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/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 <asm/uaccess.h>
 32 
 33 /*
 34  * Get/set struct timeval with struct timespec on the native side
 35  */
 36 static int compat_get_timeval_convert(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_convert(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 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
 56 {
 57         memset(txc, 0, sizeof(struct timex));
 58 
 59         if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
 60                         __get_user(txc->modes, &utp->modes) ||
 61                         __get_user(txc->offset, &utp->offset) ||
 62                         __get_user(txc->freq, &utp->freq) ||
 63                         __get_user(txc->maxerror, &utp->maxerror) ||
 64                         __get_user(txc->esterror, &utp->esterror) ||
 65                         __get_user(txc->status, &utp->status) ||
 66                         __get_user(txc->constant, &utp->constant) ||
 67                         __get_user(txc->precision, &utp->precision) ||
 68                         __get_user(txc->tolerance, &utp->tolerance) ||
 69                         __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
 70                         __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 71                         __get_user(txc->tick, &utp->tick) ||
 72                         __get_user(txc->ppsfreq, &utp->ppsfreq) ||
 73                         __get_user(txc->jitter, &utp->jitter) ||
 74                         __get_user(txc->shift, &utp->shift) ||
 75                         __get_user(txc->stabil, &utp->stabil) ||
 76                         __get_user(txc->jitcnt, &utp->jitcnt) ||
 77                         __get_user(txc->calcnt, &utp->calcnt) ||
 78                         __get_user(txc->errcnt, &utp->errcnt) ||
 79                         __get_user(txc->stbcnt, &utp->stbcnt))
 80                 return -EFAULT;
 81 
 82         return 0;
 83 }
 84 
 85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
 86 {
 87         if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
 88                         __put_user(txc->modes, &utp->modes) ||
 89                         __put_user(txc->offset, &utp->offset) ||
 90                         __put_user(txc->freq, &utp->freq) ||
 91                         __put_user(txc->maxerror, &utp->maxerror) ||
 92                         __put_user(txc->esterror, &utp->esterror) ||
 93                         __put_user(txc->status, &utp->status) ||
 94                         __put_user(txc->constant, &utp->constant) ||
 95                         __put_user(txc->precision, &utp->precision) ||
 96                         __put_user(txc->tolerance, &utp->tolerance) ||
 97                         __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
 98                         __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
 99                         __put_user(txc->tick, &utp->tick) ||
100                         __put_user(txc->ppsfreq, &utp->ppsfreq) ||
101                         __put_user(txc->jitter, &utp->jitter) ||
102                         __put_user(txc->shift, &utp->shift) ||
103                         __put_user(txc->stabil, &utp->stabil) ||
104                         __put_user(txc->jitcnt, &utp->jitcnt) ||
105                         __put_user(txc->calcnt, &utp->calcnt) ||
106                         __put_user(txc->errcnt, &utp->errcnt) ||
107                         __put_user(txc->stbcnt, &utp->stbcnt) ||
108                         __put_user(txc->tai, &utp->tai))
109                 return -EFAULT;
110         return 0;
111 }
112 
113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
114                 struct timezone __user *tz)
115 {
116         if (tv) {
117                 struct timeval ktv;
118                 do_gettimeofday(&ktv);
119                 if (compat_put_timeval_convert(tv, &ktv))
120                         return -EFAULT;
121         }
122         if (tz) {
123                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
124                         return -EFAULT;
125         }
126 
127         return 0;
128 }
129 
130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
131                 struct timezone __user *tz)
132 {
133         struct timespec kts;
134         struct timezone ktz;
135 
136         if (tv) {
137                 if (compat_get_timeval_convert(&kts, tv))
138                         return -EFAULT;
139         }
140         if (tz) {
141                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
142                         return -EFAULT;
143         }
144 
145         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
146 }
147 
148 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
149 {
150         return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
151                         __get_user(tv->tv_sec, &ctv->tv_sec) ||
152                         __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
153 }
154 EXPORT_SYMBOL_GPL(get_compat_timeval);
155 
156 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
157 {
158         return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
159                         __put_user(tv->tv_sec, &ctv->tv_sec) ||
160                         __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
161 }
162 EXPORT_SYMBOL_GPL(put_compat_timeval);
163 
164 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
165 {
166         return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
167                         __get_user(ts->tv_sec, &cts->tv_sec) ||
168                         __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
169 }
170 EXPORT_SYMBOL_GPL(get_compat_timespec);
171 
172 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
173 {
174         return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
175                         __put_user(ts->tv_sec, &cts->tv_sec) ||
176                         __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
177 }
178 EXPORT_SYMBOL_GPL(put_compat_timespec);
179 
180 int compat_get_timeval(struct timeval *tv, const void __user *utv)
181 {
182         if (COMPAT_USE_64BIT_TIME)
183                 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
184         else
185                 return get_compat_timeval(tv, utv);
186 }
187 EXPORT_SYMBOL_GPL(compat_get_timeval);
188 
189 int compat_put_timeval(const struct timeval *tv, void __user *utv)
190 {
191         if (COMPAT_USE_64BIT_TIME)
192                 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
193         else
194                 return put_compat_timeval(tv, utv);
195 }
196 EXPORT_SYMBOL_GPL(compat_put_timeval);
197 
198 int compat_get_timespec(struct timespec *ts, const void __user *uts)
199 {
200         if (COMPAT_USE_64BIT_TIME)
201                 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
202         else
203                 return get_compat_timespec(ts, uts);
204 }
205 EXPORT_SYMBOL_GPL(compat_get_timespec);
206 
207 int compat_put_timespec(const struct timespec *ts, void __user *uts)
208 {
209         if (COMPAT_USE_64BIT_TIME)
210                 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
211         else
212                 return put_compat_timespec(ts, uts);
213 }
214 EXPORT_SYMBOL_GPL(compat_put_timespec);
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) {
230                 rmtp = restart->nanosleep.compat_rmtp;
231 
232                 if (rmtp && put_compat_timespec(&rmt, rmtp))
233                         return -EFAULT;
234         }
235 
236         return ret;
237 }
238 
239 asmlinkage long compat_sys_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 (get_compat_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         if (ret) {
260                 struct restart_block *restart
261                         = &current_thread_info()->restart_block;
262 
263                 restart->fn = compat_nanosleep_restart;
264                 restart->nanosleep.compat_rmtp = rmtp;
265 
266                 if (rmtp && put_compat_timespec(&rmt, rmtp))
267                         return -EFAULT;
268         }
269 
270         return ret;
271 }
272 
273 static inline long get_compat_itimerval(struct itimerval *o,
274                 struct compat_itimerval __user *i)
275 {
276         return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
277                 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
278                  __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
279                  __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
280                  __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
281 }
282 
283 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
284                 struct itimerval *i)
285 {
286         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
287                 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
288                  __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
289                  __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
290                  __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
291 }
292 
293 COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
294                 struct compat_itimerval __user *, it)
295 {
296         struct itimerval kit;
297         int error;
298 
299         error = do_getitimer(which, &kit);
300         if (!error && put_compat_itimerval(it, &kit))
301                 error = -EFAULT;
302         return error;
303 }
304 
305 COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
306                 struct compat_itimerval __user *, in,
307                 struct compat_itimerval __user *, out)
308 {
309         struct itimerval kin, kout;
310         int error;
311 
312         if (in) {
313                 if (get_compat_itimerval(&kin, in))
314                         return -EFAULT;
315         } else
316                 memset(&kin, 0, sizeof(kin));
317 
318         error = do_setitimer(which, &kin, out ? &kout : NULL);
319         if (error || !out)
320                 return error;
321         if (put_compat_itimerval(out, &kout))
322                 return -EFAULT;
323         return 0;
324 }
325 
326 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
327 {
328         return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
329 }
330 
331 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
332 {
333         if (tbuf) {
334                 struct tms tms;
335                 struct compat_tms tmp;
336 
337                 do_sys_times(&tms);
338                 /* Convert our struct tms to the compat version. */
339                 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
340                 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
341                 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
342                 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
343                 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
344                         return -EFAULT;
345         }
346         force_successful_syscall_return();
347         return compat_jiffies_to_clock_t(jiffies);
348 }
349 
350 #ifdef __ARCH_WANT_SYS_SIGPENDING
351 
352 /*
353  * Assumption: old_sigset_t and compat_old_sigset_t are both
354  * types that can be passed to put_user()/get_user().
355  */
356 
357 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
358 {
359         old_sigset_t s;
360         long ret;
361         mm_segment_t old_fs = get_fs();
362 
363         set_fs(KERNEL_DS);
364         ret = sys_sigpending((old_sigset_t __user *) &s);
365         set_fs(old_fs);
366         if (ret == 0)
367                 ret = put_user(s, set);
368         return ret;
369 }
370 
371 #endif
372 
373 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
374 
375 /*
376  * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
377  * blocked set of signals to the supplied signal set
378  */
379 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
380 {
381         memcpy(blocked->sig, &set, sizeof(set));
382 }
383 
384 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
385                        compat_old_sigset_t __user *, nset,
386                        compat_old_sigset_t __user *, oset)
387 {
388         old_sigset_t old_set, new_set;
389         sigset_t new_blocked;
390 
391         old_set = current->blocked.sig[0];
392 
393         if (nset) {
394                 if (get_user(new_set, nset))
395                         return -EFAULT;
396                 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
397 
398                 new_blocked = current->blocked;
399 
400                 switch (how) {
401                 case SIG_BLOCK:
402                         sigaddsetmask(&new_blocked, new_set);
403                         break;
404                 case SIG_UNBLOCK:
405                         sigdelsetmask(&new_blocked, new_set);
406                         break;
407                 case SIG_SETMASK:
408                         compat_sig_setmask(&new_blocked, new_set);
409                         break;
410                 default:
411                         return -EINVAL;
412                 }
413 
414                 set_current_blocked(&new_blocked);
415         }
416 
417         if (oset) {
418                 if (put_user(old_set, oset))
419                         return -EFAULT;
420         }
421 
422         return 0;
423 }
424 
425 #endif
426 
427 asmlinkage long compat_sys_setrlimit(unsigned int resource,
428                 struct compat_rlimit __user *rlim)
429 {
430         struct rlimit r;
431 
432         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
433             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
434             __get_user(r.rlim_max, &rlim->rlim_max))
435                 return -EFAULT;
436 
437         if (r.rlim_cur == COMPAT_RLIM_INFINITY)
438                 r.rlim_cur = RLIM_INFINITY;
439         if (r.rlim_max == COMPAT_RLIM_INFINITY)
440                 r.rlim_max = RLIM_INFINITY;
441         return do_prlimit(current, resource, &r, NULL);
442 }
443 
444 #ifdef COMPAT_RLIM_OLD_INFINITY
445 
446 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
447                 struct compat_rlimit __user *rlim)
448 {
449         struct rlimit r;
450         int ret;
451         mm_segment_t old_fs = get_fs();
452 
453         set_fs(KERNEL_DS);
454         ret = sys_old_getrlimit(resource, &r);
455         set_fs(old_fs);
456 
457         if (!ret) {
458                 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
459                         r.rlim_cur = COMPAT_RLIM_INFINITY;
460                 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
461                         r.rlim_max = COMPAT_RLIM_INFINITY;
462 
463                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
464                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
465                     __put_user(r.rlim_max, &rlim->rlim_max))
466                         return -EFAULT;
467         }
468         return ret;
469 }
470 
471 #endif
472 
473 asmlinkage long compat_sys_getrlimit(unsigned int resource,
474                 struct compat_rlimit __user *rlim)
475 {
476         struct rlimit r;
477         int ret;
478 
479         ret = do_prlimit(current, resource, NULL, &r);
480         if (!ret) {
481                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
482                         r.rlim_cur = COMPAT_RLIM_INFINITY;
483                 if (r.rlim_max > COMPAT_RLIM_INFINITY)
484                         r.rlim_max = COMPAT_RLIM_INFINITY;
485 
486                 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
487                     __put_user(r.rlim_cur, &rlim->rlim_cur) ||
488                     __put_user(r.rlim_max, &rlim->rlim_max))
489                         return -EFAULT;
490         }
491         return ret;
492 }
493 
494 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
495 {
496         if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
497             __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
498             __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
499             __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
500             __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
501             __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
502             __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
503             __put_user(r->ru_idrss, &ru->ru_idrss) ||
504             __put_user(r->ru_isrss, &ru->ru_isrss) ||
505             __put_user(r->ru_minflt, &ru->ru_minflt) ||
506             __put_user(r->ru_majflt, &ru->ru_majflt) ||
507             __put_user(r->ru_nswap, &ru->ru_nswap) ||
508             __put_user(r->ru_inblock, &ru->ru_inblock) ||
509             __put_user(r->ru_oublock, &ru->ru_oublock) ||
510             __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
511             __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
512             __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
513             __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
514             __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
515                 return -EFAULT;
516         return 0;
517 }
518 
519 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
520 {
521         struct rusage r;
522         int ret;
523         mm_segment_t old_fs = get_fs();
524 
525         set_fs(KERNEL_DS);
526         ret = sys_getrusage(who, (struct rusage __user *) &r);
527         set_fs(old_fs);
528 
529         if (ret)
530                 return ret;
531 
532         if (put_compat_rusage(&r, ru))
533                 return -EFAULT;
534 
535         return 0;
536 }
537 
538 COMPAT_SYSCALL_DEFINE4(wait4,
539         compat_pid_t, pid,
540         compat_uint_t __user *, stat_addr,
541         int, options,
542         struct compat_rusage __user *, ru)
543 {
544         if (!ru) {
545                 return sys_wait4(pid, stat_addr, options, NULL);
546         } else {
547                 struct rusage r;
548                 int ret;
549                 unsigned int status;
550                 mm_segment_t old_fs = get_fs();
551 
552                 set_fs (KERNEL_DS);
553                 ret = sys_wait4(pid,
554                                 (stat_addr ?
555                                  (unsigned int __user *) &status : NULL),
556                                 options, (struct rusage __user *) &r);
557                 set_fs (old_fs);
558 
559                 if (ret > 0) {
560                         if (put_compat_rusage(&r, ru))
561                                 return -EFAULT;
562                         if (stat_addr && put_user(status, stat_addr))
563                                 return -EFAULT;
564                 }
565                 return ret;
566         }
567 }
568 
569 COMPAT_SYSCALL_DEFINE5(waitid,
570                 int, which, compat_pid_t, pid,
571                 struct compat_siginfo __user *, uinfo, int, options,
572                 struct compat_rusage __user *, uru)
573 {
574         siginfo_t info;
575         struct rusage ru;
576         long ret;
577         mm_segment_t old_fs = get_fs();
578 
579         memset(&info, 0, sizeof(info));
580 
581         set_fs(KERNEL_DS);
582         ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
583                          uru ? (struct rusage __user *)&ru : NULL);
584         set_fs(old_fs);
585 
586         if ((ret < 0) || (info.si_signo == 0))
587                 return ret;
588 
589         if (uru) {
590                 /* sys_waitid() overwrites everything in ru */
591                 if (COMPAT_USE_64BIT_TIME)
592                         ret = copy_to_user(uru, &ru, sizeof(ru));
593                 else
594                         ret = put_compat_rusage(&ru, uru);
595                 if (ret)
596                         return -EFAULT;
597         }
598 
599         BUG_ON(info.si_code & __SI_MASK);
600         info.si_code |= __SI_CHLD;
601         return copy_siginfo_to_user32(uinfo, &info);
602 }
603 
604 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
605                                     unsigned len, struct cpumask *new_mask)
606 {
607         unsigned long *k;
608 
609         if (len < cpumask_size())
610                 memset(new_mask, 0, cpumask_size());
611         else if (len > cpumask_size())
612                 len = cpumask_size();
613 
614         k = cpumask_bits(new_mask);
615         return compat_get_bitmap(k, user_mask_ptr, len * 8);
616 }
617 
618 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
619                                              unsigned int len,
620                                              compat_ulong_t __user *user_mask_ptr)
621 {
622         cpumask_var_t new_mask;
623         int retval;
624 
625         if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
626                 return -ENOMEM;
627 
628         retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
629         if (retval)
630                 goto out;
631 
632         retval = sched_setaffinity(pid, new_mask);
633 out:
634         free_cpumask_var(new_mask);
635         return retval;
636 }
637 
638 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
639                                              compat_ulong_t __user *user_mask_ptr)
640 {
641         int ret;
642         cpumask_var_t mask;
643 
644         if ((len * BITS_PER_BYTE) < nr_cpu_ids)
645                 return -EINVAL;
646         if (len & (sizeof(compat_ulong_t)-1))
647                 return -EINVAL;
648 
649         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
650                 return -ENOMEM;
651 
652         ret = sched_getaffinity(pid, mask);
653         if (ret == 0) {
654                 size_t retlen = min_t(size_t, len, cpumask_size());
655 
656                 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
657                         ret = -EFAULT;
658                 else
659                         ret = retlen;
660         }
661         free_cpumask_var(mask);
662 
663         return ret;
664 }
665 
666 int get_compat_itimerspec(struct itimerspec *dst,
667                           const struct compat_itimerspec __user *src)
668 {
669         if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
670             get_compat_timespec(&dst->it_value, &src->it_value))
671                 return -EFAULT;
672         return 0;
673 }
674 
675 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
676                           const struct itimerspec *src)
677 {
678         if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
679             put_compat_timespec(&src->it_value, &dst->it_value))
680                 return -EFAULT;
681         return 0;
682 }
683 
684 long compat_sys_timer_create(clockid_t which_clock,
685                         struct compat_sigevent __user *timer_event_spec,
686                         timer_t __user *created_timer_id)
687 {
688         struct sigevent __user *event = NULL;
689 
690         if (timer_event_spec) {
691                 struct sigevent kevent;
692 
693                 event = compat_alloc_user_space(sizeof(*event));
694                 if (get_compat_sigevent(&kevent, timer_event_spec) ||
695                     copy_to_user(event, &kevent, sizeof(*event)))
696                         return -EFAULT;
697         }
698 
699         return sys_timer_create(which_clock, event, created_timer_id);
700 }
701 
702 long compat_sys_timer_settime(timer_t timer_id, int flags,
703                           struct compat_itimerspec __user *new,
704                           struct compat_itimerspec __user *old)
705 {
706         long err;
707         mm_segment_t oldfs;
708         struct itimerspec newts, oldts;
709 
710         if (!new)
711                 return -EINVAL;
712         if (get_compat_itimerspec(&newts, new))
713                 return -EFAULT;
714         oldfs = get_fs();
715         set_fs(KERNEL_DS);
716         err = sys_timer_settime(timer_id, flags,
717                                 (struct itimerspec __user *) &newts,
718                                 (struct itimerspec __user *) &oldts);
719         set_fs(oldfs);
720         if (!err && old && put_compat_itimerspec(old, &oldts))
721                 return -EFAULT;
722         return err;
723 }
724 
725 long compat_sys_timer_gettime(timer_t timer_id,
726                 struct compat_itimerspec __user *setting)
727 {
728         long err;
729         mm_segment_t oldfs;
730         struct itimerspec ts;
731 
732         oldfs = get_fs();
733         set_fs(KERNEL_DS);
734         err = sys_timer_gettime(timer_id,
735                                 (struct itimerspec __user *) &ts);
736         set_fs(oldfs);
737         if (!err && put_compat_itimerspec(setting, &ts))
738                 return -EFAULT;
739         return err;
740 }
741 
742 long compat_sys_clock_settime(clockid_t which_clock,
743                 struct compat_timespec __user *tp)
744 {
745         long err;
746         mm_segment_t oldfs;
747         struct timespec ts;
748 
749         if (get_compat_timespec(&ts, tp))
750                 return -EFAULT;
751         oldfs = get_fs();
752         set_fs(KERNEL_DS);
753         err = sys_clock_settime(which_clock,
754                                 (struct timespec __user *) &ts);
755         set_fs(oldfs);
756         return err;
757 }
758 
759 long compat_sys_clock_gettime(clockid_t which_clock,
760                 struct compat_timespec __user *tp)
761 {
762         long err;
763         mm_segment_t oldfs;
764         struct timespec ts;
765 
766         oldfs = get_fs();
767         set_fs(KERNEL_DS);
768         err = sys_clock_gettime(which_clock,
769                                 (struct timespec __user *) &ts);
770         set_fs(oldfs);
771         if (!err && put_compat_timespec(&ts, tp))
772                 return -EFAULT;
773         return err;
774 }
775 
776 long compat_sys_clock_adjtime(clockid_t which_clock,
777                 struct compat_timex __user *utp)
778 {
779         struct timex txc;
780         mm_segment_t oldfs;
781         int err, ret;
782 
783         err = compat_get_timex(&txc, utp);
784         if (err)
785                 return err;
786 
787         oldfs = get_fs();
788         set_fs(KERNEL_DS);
789         ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
790         set_fs(oldfs);
791 
792         err = compat_put_timex(utp, &txc);
793         if (err)
794                 return err;
795 
796         return ret;
797 }
798 
799 long compat_sys_clock_getres(clockid_t which_clock,
800                 struct compat_timespec __user *tp)
801 {
802         long err;
803         mm_segment_t oldfs;
804         struct timespec ts;
805 
806         oldfs = get_fs();
807         set_fs(KERNEL_DS);
808         err = sys_clock_getres(which_clock,
809                                (struct timespec __user *) &ts);
810         set_fs(oldfs);
811         if (!err && tp && put_compat_timespec(&ts, tp))
812                 return -EFAULT;
813         return err;
814 }
815 
816 static long compat_clock_nanosleep_restart(struct restart_block *restart)
817 {
818         long err;
819         mm_segment_t oldfs;
820         struct timespec tu;
821         struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
822 
823         restart->nanosleep.rmtp = (struct timespec __user *) &tu;
824         oldfs = get_fs();
825         set_fs(KERNEL_DS);
826         err = clock_nanosleep_restart(restart);
827         set_fs(oldfs);
828 
829         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
830             put_compat_timespec(&tu, rmtp))
831                 return -EFAULT;
832 
833         if (err == -ERESTART_RESTARTBLOCK) {
834                 restart->fn = compat_clock_nanosleep_restart;
835                 restart->nanosleep.compat_rmtp = rmtp;
836         }
837         return err;
838 }
839 
840 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
841                             struct compat_timespec __user *rqtp,
842                             struct compat_timespec __user *rmtp)
843 {
844         long err;
845         mm_segment_t oldfs;
846         struct timespec in, out;
847         struct restart_block *restart;
848 
849         if (get_compat_timespec(&in, rqtp))
850                 return -EFAULT;
851 
852         oldfs = get_fs();
853         set_fs(KERNEL_DS);
854         err = sys_clock_nanosleep(which_clock, flags,
855                                   (struct timespec __user *) &in,
856                                   (struct timespec __user *) &out);
857         set_fs(oldfs);
858 
859         if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
860             put_compat_timespec(&out, rmtp))
861                 return -EFAULT;
862 
863         if (err == -ERESTART_RESTARTBLOCK) {
864                 restart = &current_thread_info()->restart_block;
865                 restart->fn = compat_clock_nanosleep_restart;
866                 restart->nanosleep.compat_rmtp = rmtp;
867         }
868         return err;
869 }
870 
871 /*
872  * We currently only need the following fields from the sigevent
873  * structure: sigev_value, sigev_signo, sig_notify and (sometimes
874  * sigev_notify_thread_id).  The others are handled in user mode.
875  * We also assume that copying sigev_value.sival_int is sufficient
876  * to keep all the bits of sigev_value.sival_ptr intact.
877  */
878 int get_compat_sigevent(struct sigevent *event,
879                 const struct compat_sigevent __user *u_event)
880 {
881         memset(event, 0, sizeof(*event));
882         return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
883                 __get_user(event->sigev_value.sival_int,
884                         &u_event->sigev_value.sival_int) ||
885                 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
886                 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
887                 __get_user(event->sigev_notify_thread_id,
888                         &u_event->sigev_notify_thread_id))
889                 ? -EFAULT : 0;
890 }
891 
892 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
893                        unsigned long bitmap_size)
894 {
895         int i, j;
896         unsigned long m;
897         compat_ulong_t um;
898         unsigned long nr_compat_longs;
899 
900         /* align bitmap up to nearest compat_long_t boundary */
901         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
902 
903         if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
904                 return -EFAULT;
905 
906         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
907 
908         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
909                 m = 0;
910 
911                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
912                         /*
913                          * We dont want to read past the end of the userspace
914                          * bitmap. We must however ensure the end of the
915                          * kernel bitmap is zeroed.
916                          */
917                         if (nr_compat_longs-- > 0) {
918                                 if (__get_user(um, umask))
919                                         return -EFAULT;
920                         } else {
921                                 um = 0;
922                         }
923 
924                         umask++;
925                         m |= (long)um << (j * BITS_PER_COMPAT_LONG);
926                 }
927                 *mask++ = m;
928         }
929 
930         return 0;
931 }
932 
933 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
934                        unsigned long bitmap_size)
935 {
936         int i, j;
937         unsigned long m;
938         compat_ulong_t um;
939         unsigned long nr_compat_longs;
940 
941         /* align bitmap up to nearest compat_long_t boundary */
942         bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
943 
944         if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
945                 return -EFAULT;
946 
947         nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
948 
949         for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
950                 m = *mask++;
951 
952                 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
953                         um = m;
954 
955                         /*
956                          * We dont want to write past the end of the userspace
957                          * bitmap.
958                          */
959                         if (nr_compat_longs-- > 0) {
960                                 if (__put_user(um, umask))
961                                         return -EFAULT;
962                         }
963 
964                         umask++;
965                         m >>= 4*sizeof(um);
966                         m >>= 4*sizeof(um);
967                 }
968         }
969 
970         return 0;
971 }
972 
973 void
974 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
975 {
976         switch (_NSIG_WORDS) {
977         case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
978         case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
979         case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
980         case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
981         }
982 }
983 EXPORT_SYMBOL_GPL(sigset_from_compat);
984 
985 void
986 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
987 {
988         switch (_NSIG_WORDS) {
989         case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
990         case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
991         case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
992         case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
993         }
994 }
995 
996 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
997                 struct compat_siginfo __user *, uinfo,
998                 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
999 {
1000         compat_sigset_t s32;
1001         sigset_t s;
1002         struct timespec t;
1003         siginfo_t info;
1004         long ret;
1005 
1006         if (sigsetsize != sizeof(sigset_t))
1007                 return -EINVAL;
1008 
1009         if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1010                 return -EFAULT;
1011         sigset_from_compat(&s, &s32);
1012 
1013         if (uts) {
1014                 if (compat_get_timespec(&t, uts))
1015                         return -EFAULT;
1016         }
1017 
1018         ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1019 
1020         if (ret > 0 && uinfo) {
1021                 if (copy_siginfo_to_user32(uinfo, &info))
1022                         ret = -EFAULT;
1023         }
1024 
1025         return ret;
1026 }
1027 
1028 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
1029 
1030 /* compat_time_t is a 32 bit "long" and needs to get converted. */
1031 
1032 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
1033 {
1034         compat_time_t i;
1035         struct timeval tv;
1036 
1037         do_gettimeofday(&tv);
1038         i = tv.tv_sec;
1039 
1040         if (tloc) {
1041                 if (put_user(i,tloc))
1042                         return -EFAULT;
1043         }
1044         force_successful_syscall_return();
1045         return i;
1046 }
1047 
1048 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1049 {
1050         struct timespec tv;
1051         int err;
1052 
1053         if (get_user(tv.tv_sec, tptr))
1054                 return -EFAULT;
1055 
1056         tv.tv_nsec = 0;
1057 
1058         err = security_settime(&tv, NULL);
1059         if (err)
1060                 return err;
1061 
1062         do_settimeofday(&tv);
1063         return 0;
1064 }
1065 
1066 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1067 
1068 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1069 {
1070         struct timex txc;
1071         int err, ret;
1072 
1073         err = compat_get_timex(&txc, utp);
1074         if (err)
1075                 return err;
1076 
1077         ret = do_adjtimex(&txc);
1078 
1079         err = compat_put_timex(utp, &txc);
1080         if (err)
1081                 return err;
1082 
1083         return ret;
1084 }
1085 
1086 #ifdef CONFIG_NUMA
1087 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1088                 compat_uptr_t __user *pages32,
1089                 const int __user *nodes,
1090                 int __user *status,
1091                 int flags)
1092 {
1093         const void __user * __user *pages;
1094         int i;
1095 
1096         pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1097         for (i = 0; i < nr_pages; i++) {
1098                 compat_uptr_t p;
1099 
1100                 if (get_user(p, pages32 + i) ||
1101                         put_user(compat_ptr(p), pages + i))
1102                         return -EFAULT;
1103         }
1104         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1105 }
1106 
1107 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1108                         compat_ulong_t maxnode,
1109                         const compat_ulong_t __user *old_nodes,
1110                         const compat_ulong_t __user *new_nodes)
1111 {
1112         unsigned long __user *old = NULL;
1113         unsigned long __user *new = NULL;
1114         nodemask_t tmp_mask;
1115         unsigned long nr_bits;
1116         unsigned long size;
1117 
1118         nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1119         size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1120         if (old_nodes) {
1121                 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1122                         return -EFAULT;
1123                 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1124                 if (new_nodes)
1125                         new = old + size / sizeof(unsigned long);
1126                 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1127                         return -EFAULT;
1128         }
1129         if (new_nodes) {
1130                 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1131                         return -EFAULT;
1132                 if (new == NULL)
1133                         new = compat_alloc_user_space(size);
1134                 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1135                         return -EFAULT;
1136         }
1137         return sys_migrate_pages(pid, nr_bits + 1, old, new);
1138 }
1139 #endif
1140 
1141 struct compat_sysinfo {
1142         s32 uptime;
1143         u32 loads[3];
1144         u32 totalram;
1145         u32 freeram;
1146         u32 sharedram;
1147         u32 bufferram;
1148         u32 totalswap;
1149         u32 freeswap;
1150         u16 procs;
1151         u16 pad;
1152         u32 totalhigh;
1153         u32 freehigh;
1154         u32 mem_unit;
1155         char _f[20-2*sizeof(u32)-sizeof(int)];
1156 };
1157 
1158 asmlinkage long
1159 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1160 {
1161         struct sysinfo s;
1162 
1163         do_sysinfo(&s);
1164 
1165         /* Check to see if any memory value is too large for 32-bit and scale
1166          *  down if needed
1167          */
1168         if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1169                 int bitcount = 0;
1170 
1171                 while (s.mem_unit < PAGE_SIZE) {
1172                         s.mem_unit <<= 1;
1173                         bitcount++;
1174                 }
1175 
1176                 s.totalram >>= bitcount;
1177                 s.freeram >>= bitcount;
1178                 s.sharedram >>= bitcount;
1179                 s.bufferram >>= bitcount;
1180                 s.totalswap >>= bitcount;
1181                 s.freeswap >>= bitcount;
1182                 s.totalhigh >>= bitcount;
1183                 s.freehigh >>= bitcount;
1184         }
1185 
1186         if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1187             __put_user (s.uptime, &info->uptime) ||
1188             __put_user (s.loads[0], &info->loads[0]) ||
1189             __put_user (s.loads[1], &info->loads[1]) ||
1190             __put_user (s.loads[2], &info->loads[2]) ||
1191             __put_user (s.totalram, &info->totalram) ||
1192             __put_user (s.freeram, &info->freeram) ||
1193             __put_user (s.sharedram, &info->sharedram) ||
1194             __put_user (s.bufferram, &info->bufferram) ||
1195             __put_user (s.totalswap, &info->totalswap) ||
1196             __put_user (s.freeswap, &info->freeswap) ||
1197             __put_user (s.procs, &info->procs) ||
1198             __put_user (s.totalhigh, &info->totalhigh) ||
1199             __put_user (s.freehigh, &info->freehigh) ||
1200             __put_user (s.mem_unit, &info->mem_unit))
1201                 return -EFAULT;
1202 
1203         return 0;
1204 }
1205 
1206 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1207                        compat_pid_t, pid,
1208                        struct compat_timespec __user *, interval)
1209 {
1210         struct timespec t;
1211         int ret;
1212         mm_segment_t old_fs = get_fs();
1213 
1214         set_fs(KERNEL_DS);
1215         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1216         set_fs(old_fs);
1217         if (put_compat_timespec(&t, interval))
1218                 return -EFAULT;
1219         return ret;
1220 }
1221 
1222 /*
1223  * Allocate user-space memory for the duration of a single system call,
1224  * in order to marshall parameters inside a compat thunk.
1225  */
1226 void __user *compat_alloc_user_space(unsigned long len)
1227 {
1228         void __user *ptr;
1229 
1230         /* If len would occupy more than half of the entire compat space... */
1231         if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1232                 return NULL;
1233 
1234         ptr = arch_compat_alloc_user_space(len);
1235 
1236         if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1237                 return NULL;
1238 
1239         return ptr;
1240 }
1241 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1242 

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