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 * Note that the native side is already converted to a timespec, because
35 * that's what we want anyway.
36 */
compat_get_timeval(struct timespec * o,struct compat_timeval __user * i)37 static int compat_get_timeval(struct timespec *o,
38 struct compat_timeval __user *i)
39 {
40 long usec;
41
42 if (get_user(o->tv_sec, &i->tv_sec) ||
43 get_user(usec, &i->tv_usec))
44 return -EFAULT;
45 o->tv_nsec = usec * 1000;
46 return 0;
47 }
48
compat_put_timeval(struct compat_timeval __user * o,struct timeval * i)49 static int compat_put_timeval(struct compat_timeval __user *o,
50 struct timeval *i)
51 {
52 return (put_user(i->tv_sec, &o->tv_sec) ||
53 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
54 }
55
compat_get_timex(struct timex * txc,struct compat_timex __user * utp)56 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
57 {
58 memset(txc, 0, sizeof(struct timex));
59
60 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
61 __get_user(txc->modes, &utp->modes) ||
62 __get_user(txc->offset, &utp->offset) ||
63 __get_user(txc->freq, &utp->freq) ||
64 __get_user(txc->maxerror, &utp->maxerror) ||
65 __get_user(txc->esterror, &utp->esterror) ||
66 __get_user(txc->status, &utp->status) ||
67 __get_user(txc->constant, &utp->constant) ||
68 __get_user(txc->precision, &utp->precision) ||
69 __get_user(txc->tolerance, &utp->tolerance) ||
70 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
71 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
72 __get_user(txc->tick, &utp->tick) ||
73 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
74 __get_user(txc->jitter, &utp->jitter) ||
75 __get_user(txc->shift, &utp->shift) ||
76 __get_user(txc->stabil, &utp->stabil) ||
77 __get_user(txc->jitcnt, &utp->jitcnt) ||
78 __get_user(txc->calcnt, &utp->calcnt) ||
79 __get_user(txc->errcnt, &utp->errcnt) ||
80 __get_user(txc->stbcnt, &utp->stbcnt))
81 return -EFAULT;
82
83 return 0;
84 }
85
compat_put_timex(struct compat_timex __user * utp,struct timex * txc)86 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
87 {
88 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
89 __put_user(txc->modes, &utp->modes) ||
90 __put_user(txc->offset, &utp->offset) ||
91 __put_user(txc->freq, &utp->freq) ||
92 __put_user(txc->maxerror, &utp->maxerror) ||
93 __put_user(txc->esterror, &utp->esterror) ||
94 __put_user(txc->status, &utp->status) ||
95 __put_user(txc->constant, &utp->constant) ||
96 __put_user(txc->precision, &utp->precision) ||
97 __put_user(txc->tolerance, &utp->tolerance) ||
98 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
99 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
100 __put_user(txc->tick, &utp->tick) ||
101 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
102 __put_user(txc->jitter, &utp->jitter) ||
103 __put_user(txc->shift, &utp->shift) ||
104 __put_user(txc->stabil, &utp->stabil) ||
105 __put_user(txc->jitcnt, &utp->jitcnt) ||
106 __put_user(txc->calcnt, &utp->calcnt) ||
107 __put_user(txc->errcnt, &utp->errcnt) ||
108 __put_user(txc->stbcnt, &utp->stbcnt) ||
109 __put_user(txc->tai, &utp->tai))
110 return -EFAULT;
111 return 0;
112 }
113
compat_sys_gettimeofday(struct compat_timeval __user * tv,struct timezone __user * tz)114 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
115 struct timezone __user *tz)
116 {
117 if (tv) {
118 struct timeval ktv;
119 do_gettimeofday(&ktv);
120 if (compat_put_timeval(tv, &ktv))
121 return -EFAULT;
122 }
123 if (tz) {
124 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
125 return -EFAULT;
126 }
127
128 return 0;
129 }
130
compat_sys_settimeofday(struct compat_timeval __user * tv,struct timezone __user * tz)131 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
132 struct timezone __user *tz)
133 {
134 struct timespec kts;
135 struct timezone ktz;
136
137 if (tv) {
138 if (compat_get_timeval(&kts, tv))
139 return -EFAULT;
140 }
141 if (tz) {
142 if (copy_from_user(&ktz, tz, sizeof(ktz)))
143 return -EFAULT;
144 }
145
146 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
147 }
148
get_compat_timespec(struct timespec * ts,const struct compat_timespec __user * cts)149 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
150 {
151 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
152 __get_user(ts->tv_sec, &cts->tv_sec) ||
153 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
154 }
155
put_compat_timespec(const struct timespec * ts,struct compat_timespec __user * cts)156 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
157 {
158 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
159 __put_user(ts->tv_sec, &cts->tv_sec) ||
160 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
161 }
162 EXPORT_SYMBOL_GPL(put_compat_timespec);
163
compat_nanosleep_restart(struct restart_block * restart)164 static long compat_nanosleep_restart(struct restart_block *restart)
165 {
166 struct compat_timespec __user *rmtp;
167 struct timespec rmt;
168 mm_segment_t oldfs;
169 long ret;
170
171 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
172 oldfs = get_fs();
173 set_fs(KERNEL_DS);
174 ret = hrtimer_nanosleep_restart(restart);
175 set_fs(oldfs);
176
177 if (ret) {
178 rmtp = restart->nanosleep.compat_rmtp;
179
180 if (rmtp && put_compat_timespec(&rmt, rmtp))
181 return -EFAULT;
182 }
183
184 return ret;
185 }
186
compat_sys_nanosleep(struct compat_timespec __user * rqtp,struct compat_timespec __user * rmtp)187 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
188 struct compat_timespec __user *rmtp)
189 {
190 struct timespec tu, rmt;
191 mm_segment_t oldfs;
192 long ret;
193
194 if (get_compat_timespec(&tu, rqtp))
195 return -EFAULT;
196
197 if (!timespec_valid(&tu))
198 return -EINVAL;
199
200 oldfs = get_fs();
201 set_fs(KERNEL_DS);
202 ret = hrtimer_nanosleep(&tu,
203 rmtp ? (struct timespec __user *)&rmt : NULL,
204 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
205 set_fs(oldfs);
206
207 if (ret) {
208 struct restart_block *restart
209 = ¤t_thread_info()->restart_block;
210
211 restart->fn = compat_nanosleep_restart;
212 restart->nanosleep.compat_rmtp = rmtp;
213
214 if (rmtp && put_compat_timespec(&rmt, rmtp))
215 return -EFAULT;
216 }
217
218 return ret;
219 }
220
get_compat_itimerval(struct itimerval * o,struct compat_itimerval __user * i)221 static inline long get_compat_itimerval(struct itimerval *o,
222 struct compat_itimerval __user *i)
223 {
224 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
225 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
226 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
227 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
228 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
229 }
230
put_compat_itimerval(struct compat_itimerval __user * o,struct itimerval * i)231 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
232 struct itimerval *i)
233 {
234 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
235 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
236 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
237 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
238 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
239 }
240
compat_sys_getitimer(int which,struct compat_itimerval __user * it)241 asmlinkage long compat_sys_getitimer(int which,
242 struct compat_itimerval __user *it)
243 {
244 struct itimerval kit;
245 int error;
246
247 error = do_getitimer(which, &kit);
248 if (!error && put_compat_itimerval(it, &kit))
249 error = -EFAULT;
250 return error;
251 }
252
compat_sys_setitimer(int which,struct compat_itimerval __user * in,struct compat_itimerval __user * out)253 asmlinkage long compat_sys_setitimer(int which,
254 struct compat_itimerval __user *in,
255 struct compat_itimerval __user *out)
256 {
257 struct itimerval kin, kout;
258 int error;
259
260 if (in) {
261 if (get_compat_itimerval(&kin, in))
262 return -EFAULT;
263 } else
264 memset(&kin, 0, sizeof(kin));
265
266 error = do_setitimer(which, &kin, out ? &kout : NULL);
267 if (error || !out)
268 return error;
269 if (put_compat_itimerval(out, &kout))
270 return -EFAULT;
271 return 0;
272 }
273
clock_t_to_compat_clock_t(clock_t x)274 static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
275 {
276 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
277 }
278
compat_sys_times(struct compat_tms __user * tbuf)279 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
280 {
281 if (tbuf) {
282 struct tms tms;
283 struct compat_tms tmp;
284
285 do_sys_times(&tms);
286 /* Convert our struct tms to the compat version. */
287 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
288 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
289 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
290 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
291 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
292 return -EFAULT;
293 }
294 force_successful_syscall_return();
295 return compat_jiffies_to_clock_t(jiffies);
296 }
297
298 #ifdef __ARCH_WANT_SYS_SIGPENDING
299
300 /*
301 * Assumption: old_sigset_t and compat_old_sigset_t are both
302 * types that can be passed to put_user()/get_user().
303 */
304
compat_sys_sigpending(compat_old_sigset_t __user * set)305 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
306 {
307 old_sigset_t s;
308 long ret;
309 mm_segment_t old_fs = get_fs();
310
311 set_fs(KERNEL_DS);
312 ret = sys_sigpending((old_sigset_t __user *) &s);
313 set_fs(old_fs);
314 if (ret == 0)
315 ret = put_user(s, set);
316 return ret;
317 }
318
319 #endif
320
321 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
322
compat_sys_sigprocmask(int how,compat_old_sigset_t __user * set,compat_old_sigset_t __user * oset)323 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
324 compat_old_sigset_t __user *oset)
325 {
326 old_sigset_t s;
327 long ret;
328 mm_segment_t old_fs;
329
330 if (set && get_user(s, set))
331 return -EFAULT;
332 old_fs = get_fs();
333 set_fs(KERNEL_DS);
334 ret = sys_sigprocmask(how,
335 set ? (old_sigset_t __user *) &s : NULL,
336 oset ? (old_sigset_t __user *) &s : NULL);
337 set_fs(old_fs);
338 if (ret == 0)
339 if (oset)
340 ret = put_user(s, oset);
341 return ret;
342 }
343
344 #endif
345
compat_sys_setrlimit(unsigned int resource,struct compat_rlimit __user * rlim)346 asmlinkage long compat_sys_setrlimit(unsigned int resource,
347 struct compat_rlimit __user *rlim)
348 {
349 struct rlimit r;
350
351 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
352 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
353 __get_user(r.rlim_max, &rlim->rlim_max))
354 return -EFAULT;
355
356 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
357 r.rlim_cur = RLIM_INFINITY;
358 if (r.rlim_max == COMPAT_RLIM_INFINITY)
359 r.rlim_max = RLIM_INFINITY;
360 return do_prlimit(current, resource, &r, NULL);
361 }
362
363 #ifdef COMPAT_RLIM_OLD_INFINITY
364
compat_sys_old_getrlimit(unsigned int resource,struct compat_rlimit __user * rlim)365 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
366 struct compat_rlimit __user *rlim)
367 {
368 struct rlimit r;
369 int ret;
370 mm_segment_t old_fs = get_fs();
371
372 set_fs(KERNEL_DS);
373 ret = sys_old_getrlimit(resource, &r);
374 set_fs(old_fs);
375
376 if (!ret) {
377 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
378 r.rlim_cur = COMPAT_RLIM_INFINITY;
379 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
380 r.rlim_max = COMPAT_RLIM_INFINITY;
381
382 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
383 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
384 __put_user(r.rlim_max, &rlim->rlim_max))
385 return -EFAULT;
386 }
387 return ret;
388 }
389
390 #endif
391
compat_sys_getrlimit(unsigned int resource,struct compat_rlimit __user * rlim)392 asmlinkage long compat_sys_getrlimit(unsigned int resource,
393 struct compat_rlimit __user *rlim)
394 {
395 struct rlimit r;
396 int ret;
397
398 ret = do_prlimit(current, resource, NULL, &r);
399 if (!ret) {
400 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
401 r.rlim_cur = COMPAT_RLIM_INFINITY;
402 if (r.rlim_max > COMPAT_RLIM_INFINITY)
403 r.rlim_max = COMPAT_RLIM_INFINITY;
404
405 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
406 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
407 __put_user(r.rlim_max, &rlim->rlim_max))
408 return -EFAULT;
409 }
410 return ret;
411 }
412
put_compat_rusage(const struct rusage * r,struct compat_rusage __user * ru)413 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
414 {
415 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
416 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
417 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
418 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
419 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
420 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
421 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
422 __put_user(r->ru_idrss, &ru->ru_idrss) ||
423 __put_user(r->ru_isrss, &ru->ru_isrss) ||
424 __put_user(r->ru_minflt, &ru->ru_minflt) ||
425 __put_user(r->ru_majflt, &ru->ru_majflt) ||
426 __put_user(r->ru_nswap, &ru->ru_nswap) ||
427 __put_user(r->ru_inblock, &ru->ru_inblock) ||
428 __put_user(r->ru_oublock, &ru->ru_oublock) ||
429 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
430 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
431 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
432 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
433 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
434 return -EFAULT;
435 return 0;
436 }
437
compat_sys_getrusage(int who,struct compat_rusage __user * ru)438 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
439 {
440 struct rusage r;
441 int ret;
442 mm_segment_t old_fs = get_fs();
443
444 set_fs(KERNEL_DS);
445 ret = sys_getrusage(who, (struct rusage __user *) &r);
446 set_fs(old_fs);
447
448 if (ret)
449 return ret;
450
451 if (put_compat_rusage(&r, ru))
452 return -EFAULT;
453
454 return 0;
455 }
456
457 asmlinkage long
compat_sys_wait4(compat_pid_t pid,compat_uint_t __user * stat_addr,int options,struct compat_rusage __user * ru)458 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
459 struct compat_rusage __user *ru)
460 {
461 if (!ru) {
462 return sys_wait4(pid, stat_addr, options, NULL);
463 } else {
464 struct rusage r;
465 int ret;
466 unsigned int status;
467 mm_segment_t old_fs = get_fs();
468
469 set_fs (KERNEL_DS);
470 ret = sys_wait4(pid,
471 (stat_addr ?
472 (unsigned int __user *) &status : NULL),
473 options, (struct rusage __user *) &r);
474 set_fs (old_fs);
475
476 if (ret > 0) {
477 if (put_compat_rusage(&r, ru))
478 return -EFAULT;
479 if (stat_addr && put_user(status, stat_addr))
480 return -EFAULT;
481 }
482 return ret;
483 }
484 }
485
compat_sys_waitid(int which,compat_pid_t pid,struct compat_siginfo __user * uinfo,int options,struct compat_rusage __user * uru)486 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
487 struct compat_siginfo __user *uinfo, int options,
488 struct compat_rusage __user *uru)
489 {
490 siginfo_t info;
491 struct rusage ru;
492 long ret;
493 mm_segment_t old_fs = get_fs();
494
495 memset(&info, 0, sizeof(info));
496
497 set_fs(KERNEL_DS);
498 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
499 uru ? (struct rusage __user *)&ru : NULL);
500 set_fs(old_fs);
501
502 if ((ret < 0) || (info.si_signo == 0))
503 return ret;
504
505 if (uru) {
506 ret = put_compat_rusage(&ru, uru);
507 if (ret)
508 return ret;
509 }
510
511 BUG_ON(info.si_code & __SI_MASK);
512 info.si_code |= __SI_CHLD;
513 return copy_siginfo_to_user32(uinfo, &info);
514 }
515
compat_get_user_cpu_mask(compat_ulong_t __user * user_mask_ptr,unsigned len,struct cpumask * new_mask)516 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
517 unsigned len, struct cpumask *new_mask)
518 {
519 unsigned long *k;
520
521 if (len < cpumask_size())
522 memset(new_mask, 0, cpumask_size());
523 else if (len > cpumask_size())
524 len = cpumask_size();
525
526 k = cpumask_bits(new_mask);
527 return compat_get_bitmap(k, user_mask_ptr, len * 8);
528 }
529
compat_sys_sched_setaffinity(compat_pid_t pid,unsigned int len,compat_ulong_t __user * user_mask_ptr)530 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
531 unsigned int len,
532 compat_ulong_t __user *user_mask_ptr)
533 {
534 cpumask_var_t new_mask;
535 int retval;
536
537 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
538 return -ENOMEM;
539
540 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
541 if (retval)
542 goto out;
543
544 retval = sched_setaffinity(pid, new_mask);
545 out:
546 free_cpumask_var(new_mask);
547 return retval;
548 }
549
compat_sys_sched_getaffinity(compat_pid_t pid,unsigned int len,compat_ulong_t __user * user_mask_ptr)550 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
551 compat_ulong_t __user *user_mask_ptr)
552 {
553 int ret;
554 cpumask_var_t mask;
555
556 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
557 return -EINVAL;
558 if (len & (sizeof(compat_ulong_t)-1))
559 return -EINVAL;
560
561 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
562 return -ENOMEM;
563
564 ret = sched_getaffinity(pid, mask);
565 if (ret == 0) {
566 size_t retlen = min_t(size_t, len, cpumask_size());
567
568 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
569 ret = -EFAULT;
570 else
571 ret = retlen;
572 }
573 free_cpumask_var(mask);
574
575 return ret;
576 }
577
get_compat_itimerspec(struct itimerspec * dst,const struct compat_itimerspec __user * src)578 int get_compat_itimerspec(struct itimerspec *dst,
579 const struct compat_itimerspec __user *src)
580 {
581 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
582 get_compat_timespec(&dst->it_value, &src->it_value))
583 return -EFAULT;
584 return 0;
585 }
586
put_compat_itimerspec(struct compat_itimerspec __user * dst,const struct itimerspec * src)587 int put_compat_itimerspec(struct compat_itimerspec __user *dst,
588 const struct itimerspec *src)
589 {
590 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
591 put_compat_timespec(&src->it_value, &dst->it_value))
592 return -EFAULT;
593 return 0;
594 }
595
compat_sys_timer_create(clockid_t which_clock,struct compat_sigevent __user * timer_event_spec,timer_t __user * created_timer_id)596 long compat_sys_timer_create(clockid_t which_clock,
597 struct compat_sigevent __user *timer_event_spec,
598 timer_t __user *created_timer_id)
599 {
600 struct sigevent __user *event = NULL;
601
602 if (timer_event_spec) {
603 struct sigevent kevent;
604
605 event = compat_alloc_user_space(sizeof(*event));
606 if (get_compat_sigevent(&kevent, timer_event_spec) ||
607 copy_to_user(event, &kevent, sizeof(*event)))
608 return -EFAULT;
609 }
610
611 return sys_timer_create(which_clock, event, created_timer_id);
612 }
613
compat_sys_timer_settime(timer_t timer_id,int flags,struct compat_itimerspec __user * new,struct compat_itimerspec __user * old)614 long compat_sys_timer_settime(timer_t timer_id, int flags,
615 struct compat_itimerspec __user *new,
616 struct compat_itimerspec __user *old)
617 {
618 long err;
619 mm_segment_t oldfs;
620 struct itimerspec newts, oldts;
621
622 if (!new)
623 return -EINVAL;
624 if (get_compat_itimerspec(&newts, new))
625 return -EFAULT;
626 oldfs = get_fs();
627 set_fs(KERNEL_DS);
628 err = sys_timer_settime(timer_id, flags,
629 (struct itimerspec __user *) &newts,
630 (struct itimerspec __user *) &oldts);
631 set_fs(oldfs);
632 if (!err && old && put_compat_itimerspec(old, &oldts))
633 return -EFAULT;
634 return err;
635 }
636
compat_sys_timer_gettime(timer_t timer_id,struct compat_itimerspec __user * setting)637 long compat_sys_timer_gettime(timer_t timer_id,
638 struct compat_itimerspec __user *setting)
639 {
640 long err;
641 mm_segment_t oldfs;
642 struct itimerspec ts;
643
644 oldfs = get_fs();
645 set_fs(KERNEL_DS);
646 err = sys_timer_gettime(timer_id,
647 (struct itimerspec __user *) &ts);
648 set_fs(oldfs);
649 if (!err && put_compat_itimerspec(setting, &ts))
650 return -EFAULT;
651 return err;
652 }
653
compat_sys_clock_settime(clockid_t which_clock,struct compat_timespec __user * tp)654 long compat_sys_clock_settime(clockid_t which_clock,
655 struct compat_timespec __user *tp)
656 {
657 long err;
658 mm_segment_t oldfs;
659 struct timespec ts;
660
661 if (get_compat_timespec(&ts, tp))
662 return -EFAULT;
663 oldfs = get_fs();
664 set_fs(KERNEL_DS);
665 err = sys_clock_settime(which_clock,
666 (struct timespec __user *) &ts);
667 set_fs(oldfs);
668 return err;
669 }
670
compat_sys_clock_gettime(clockid_t which_clock,struct compat_timespec __user * tp)671 long compat_sys_clock_gettime(clockid_t which_clock,
672 struct compat_timespec __user *tp)
673 {
674 long err;
675 mm_segment_t oldfs;
676 struct timespec ts;
677
678 oldfs = get_fs();
679 set_fs(KERNEL_DS);
680 err = sys_clock_gettime(which_clock,
681 (struct timespec __user *) &ts);
682 set_fs(oldfs);
683 if (!err && put_compat_timespec(&ts, tp))
684 return -EFAULT;
685 return err;
686 }
687
compat_sys_clock_adjtime(clockid_t which_clock,struct compat_timex __user * utp)688 long compat_sys_clock_adjtime(clockid_t which_clock,
689 struct compat_timex __user *utp)
690 {
691 struct timex txc;
692 mm_segment_t oldfs;
693 int err, ret;
694
695 err = compat_get_timex(&txc, utp);
696 if (err)
697 return err;
698
699 oldfs = get_fs();
700 set_fs(KERNEL_DS);
701 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
702 set_fs(oldfs);
703
704 err = compat_put_timex(utp, &txc);
705 if (err)
706 return err;
707
708 return ret;
709 }
710
compat_sys_clock_getres(clockid_t which_clock,struct compat_timespec __user * tp)711 long compat_sys_clock_getres(clockid_t which_clock,
712 struct compat_timespec __user *tp)
713 {
714 long err;
715 mm_segment_t oldfs;
716 struct timespec ts;
717
718 oldfs = get_fs();
719 set_fs(KERNEL_DS);
720 err = sys_clock_getres(which_clock,
721 (struct timespec __user *) &ts);
722 set_fs(oldfs);
723 if (!err && tp && put_compat_timespec(&ts, tp))
724 return -EFAULT;
725 return err;
726 }
727
compat_clock_nanosleep_restart(struct restart_block * restart)728 static long compat_clock_nanosleep_restart(struct restart_block *restart)
729 {
730 long err;
731 mm_segment_t oldfs;
732 struct timespec tu;
733 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
734
735 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
736 oldfs = get_fs();
737 set_fs(KERNEL_DS);
738 err = clock_nanosleep_restart(restart);
739 set_fs(oldfs);
740
741 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
742 put_compat_timespec(&tu, rmtp))
743 return -EFAULT;
744
745 if (err == -ERESTART_RESTARTBLOCK) {
746 restart->fn = compat_clock_nanosleep_restart;
747 restart->nanosleep.compat_rmtp = rmtp;
748 }
749 return err;
750 }
751
compat_sys_clock_nanosleep(clockid_t which_clock,int flags,struct compat_timespec __user * rqtp,struct compat_timespec __user * rmtp)752 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
753 struct compat_timespec __user *rqtp,
754 struct compat_timespec __user *rmtp)
755 {
756 long err;
757 mm_segment_t oldfs;
758 struct timespec in, out;
759 struct restart_block *restart;
760
761 if (get_compat_timespec(&in, rqtp))
762 return -EFAULT;
763
764 oldfs = get_fs();
765 set_fs(KERNEL_DS);
766 err = sys_clock_nanosleep(which_clock, flags,
767 (struct timespec __user *) &in,
768 (struct timespec __user *) &out);
769 set_fs(oldfs);
770
771 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
772 put_compat_timespec(&out, rmtp))
773 return -EFAULT;
774
775 if (err == -ERESTART_RESTARTBLOCK) {
776 restart = ¤t_thread_info()->restart_block;
777 restart->fn = compat_clock_nanosleep_restart;
778 restart->nanosleep.compat_rmtp = rmtp;
779 }
780 return err;
781 }
782
783 /*
784 * We currently only need the following fields from the sigevent
785 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
786 * sigev_notify_thread_id). The others are handled in user mode.
787 * We also assume that copying sigev_value.sival_int is sufficient
788 * to keep all the bits of sigev_value.sival_ptr intact.
789 */
get_compat_sigevent(struct sigevent * event,const struct compat_sigevent __user * u_event)790 int get_compat_sigevent(struct sigevent *event,
791 const struct compat_sigevent __user *u_event)
792 {
793 memset(event, 0, sizeof(*event));
794 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
795 __get_user(event->sigev_value.sival_int,
796 &u_event->sigev_value.sival_int) ||
797 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
798 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
799 __get_user(event->sigev_notify_thread_id,
800 &u_event->sigev_notify_thread_id))
801 ? -EFAULT : 0;
802 }
803
compat_get_bitmap(unsigned long * mask,const compat_ulong_t __user * umask,unsigned long bitmap_size)804 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
805 unsigned long bitmap_size)
806 {
807 int i, j;
808 unsigned long m;
809 compat_ulong_t um;
810 unsigned long nr_compat_longs;
811
812 /* align bitmap up to nearest compat_long_t boundary */
813 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
814
815 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
816 return -EFAULT;
817
818 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
819
820 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
821 m = 0;
822
823 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
824 /*
825 * We dont want to read past the end of the userspace
826 * bitmap. We must however ensure the end of the
827 * kernel bitmap is zeroed.
828 */
829 if (nr_compat_longs-- > 0) {
830 if (__get_user(um, umask))
831 return -EFAULT;
832 } else {
833 um = 0;
834 }
835
836 umask++;
837 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
838 }
839 *mask++ = m;
840 }
841
842 return 0;
843 }
844
compat_put_bitmap(compat_ulong_t __user * umask,unsigned long * mask,unsigned long bitmap_size)845 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
846 unsigned long bitmap_size)
847 {
848 int i, j;
849 unsigned long m;
850 compat_ulong_t um;
851 unsigned long nr_compat_longs;
852
853 /* align bitmap up to nearest compat_long_t boundary */
854 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
855
856 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
857 return -EFAULT;
858
859 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
860
861 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
862 m = *mask++;
863
864 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
865 um = m;
866
867 /*
868 * We dont want to write past the end of the userspace
869 * bitmap.
870 */
871 if (nr_compat_longs-- > 0) {
872 if (__put_user(um, umask))
873 return -EFAULT;
874 }
875
876 umask++;
877 m >>= 4*sizeof(um);
878 m >>= 4*sizeof(um);
879 }
880 }
881
882 return 0;
883 }
884
885 void
sigset_from_compat(sigset_t * set,compat_sigset_t * compat)886 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
887 {
888 switch (_NSIG_WORDS) {
889 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
890 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
891 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
892 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
893 }
894 }
895 EXPORT_SYMBOL_GPL(sigset_from_compat);
896
897 asmlinkage long
compat_sys_rt_sigtimedwait(compat_sigset_t __user * uthese,struct compat_siginfo __user * uinfo,struct compat_timespec __user * uts,compat_size_t sigsetsize)898 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
899 struct compat_siginfo __user *uinfo,
900 struct compat_timespec __user *uts, compat_size_t sigsetsize)
901 {
902 compat_sigset_t s32;
903 sigset_t s;
904 struct timespec t;
905 siginfo_t info;
906 long ret;
907
908 if (sigsetsize != sizeof(sigset_t))
909 return -EINVAL;
910
911 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
912 return -EFAULT;
913 sigset_from_compat(&s, &s32);
914
915 if (uts) {
916 if (get_compat_timespec(&t, uts))
917 return -EFAULT;
918 }
919
920 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
921
922 if (ret > 0 && uinfo) {
923 if (copy_siginfo_to_user32(uinfo, &info))
924 ret = -EFAULT;
925 }
926
927 return ret;
928
929 }
930
931 asmlinkage long
compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid,compat_pid_t pid,int sig,struct compat_siginfo __user * uinfo)932 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
933 struct compat_siginfo __user *uinfo)
934 {
935 siginfo_t info;
936
937 if (copy_siginfo_from_user32(&info, uinfo))
938 return -EFAULT;
939 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
940 }
941
942 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
943
944 /* compat_time_t is a 32 bit "long" and needs to get converted. */
945
compat_sys_time(compat_time_t __user * tloc)946 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
947 {
948 compat_time_t i;
949 struct timeval tv;
950
951 do_gettimeofday(&tv);
952 i = tv.tv_sec;
953
954 if (tloc) {
955 if (put_user(i,tloc))
956 return -EFAULT;
957 }
958 force_successful_syscall_return();
959 return i;
960 }
961
compat_sys_stime(compat_time_t __user * tptr)962 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
963 {
964 struct timespec tv;
965 int err;
966
967 if (get_user(tv.tv_sec, tptr))
968 return -EFAULT;
969
970 tv.tv_nsec = 0;
971
972 err = security_settime(&tv, NULL);
973 if (err)
974 return err;
975
976 do_settimeofday(&tv);
977 return 0;
978 }
979
980 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
981
982 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
compat_sys_rt_sigsuspend(compat_sigset_t __user * unewset,compat_size_t sigsetsize)983 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
984 {
985 sigset_t newset;
986 compat_sigset_t newset32;
987
988 /* XXX: Don't preclude handling different sized sigset_t's. */
989 if (sigsetsize != sizeof(sigset_t))
990 return -EINVAL;
991
992 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
993 return -EFAULT;
994 sigset_from_compat(&newset, &newset32);
995 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
996
997 current->saved_sigmask = current->blocked;
998 set_current_blocked(&newset);
999
1000 current->state = TASK_INTERRUPTIBLE;
1001 schedule();
1002 set_restore_sigmask();
1003 return -ERESTARTNOHAND;
1004 }
1005 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1006
compat_sys_adjtimex(struct compat_timex __user * utp)1007 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1008 {
1009 struct timex txc;
1010 int err, ret;
1011
1012 err = compat_get_timex(&txc, utp);
1013 if (err)
1014 return err;
1015
1016 ret = do_adjtimex(&txc);
1017
1018 err = compat_put_timex(utp, &txc);
1019 if (err)
1020 return err;
1021
1022 return ret;
1023 }
1024
1025 #ifdef CONFIG_NUMA
compat_sys_move_pages(pid_t pid,unsigned long nr_pages,compat_uptr_t __user * pages32,const int __user * nodes,int __user * status,int flags)1026 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1027 compat_uptr_t __user *pages32,
1028 const int __user *nodes,
1029 int __user *status,
1030 int flags)
1031 {
1032 const void __user * __user *pages;
1033 int i;
1034
1035 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1036 for (i = 0; i < nr_pages; i++) {
1037 compat_uptr_t p;
1038
1039 if (get_user(p, pages32 + i) ||
1040 put_user(compat_ptr(p), pages + i))
1041 return -EFAULT;
1042 }
1043 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1044 }
1045
compat_sys_migrate_pages(compat_pid_t pid,compat_ulong_t maxnode,const compat_ulong_t __user * old_nodes,const compat_ulong_t __user * new_nodes)1046 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1047 compat_ulong_t maxnode,
1048 const compat_ulong_t __user *old_nodes,
1049 const compat_ulong_t __user *new_nodes)
1050 {
1051 unsigned long __user *old = NULL;
1052 unsigned long __user *new = NULL;
1053 nodemask_t tmp_mask;
1054 unsigned long nr_bits;
1055 unsigned long size;
1056
1057 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1058 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1059 if (old_nodes) {
1060 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1061 return -EFAULT;
1062 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1063 if (new_nodes)
1064 new = old + size / sizeof(unsigned long);
1065 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1066 return -EFAULT;
1067 }
1068 if (new_nodes) {
1069 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1070 return -EFAULT;
1071 if (new == NULL)
1072 new = compat_alloc_user_space(size);
1073 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1074 return -EFAULT;
1075 }
1076 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1077 }
1078 #endif
1079
1080 struct compat_sysinfo {
1081 s32 uptime;
1082 u32 loads[3];
1083 u32 totalram;
1084 u32 freeram;
1085 u32 sharedram;
1086 u32 bufferram;
1087 u32 totalswap;
1088 u32 freeswap;
1089 u16 procs;
1090 u16 pad;
1091 u32 totalhigh;
1092 u32 freehigh;
1093 u32 mem_unit;
1094 char _f[20-2*sizeof(u32)-sizeof(int)];
1095 };
1096
1097 asmlinkage long
compat_sys_sysinfo(struct compat_sysinfo __user * info)1098 compat_sys_sysinfo(struct compat_sysinfo __user *info)
1099 {
1100 struct sysinfo s;
1101
1102 do_sysinfo(&s);
1103
1104 /* Check to see if any memory value is too large for 32-bit and scale
1105 * down if needed
1106 */
1107 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1108 int bitcount = 0;
1109
1110 while (s.mem_unit < PAGE_SIZE) {
1111 s.mem_unit <<= 1;
1112 bitcount++;
1113 }
1114
1115 s.totalram >>= bitcount;
1116 s.freeram >>= bitcount;
1117 s.sharedram >>= bitcount;
1118 s.bufferram >>= bitcount;
1119 s.totalswap >>= bitcount;
1120 s.freeswap >>= bitcount;
1121 s.totalhigh >>= bitcount;
1122 s.freehigh >>= bitcount;
1123 }
1124
1125 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1126 __put_user (s.uptime, &info->uptime) ||
1127 __put_user (s.loads[0], &info->loads[0]) ||
1128 __put_user (s.loads[1], &info->loads[1]) ||
1129 __put_user (s.loads[2], &info->loads[2]) ||
1130 __put_user (s.totalram, &info->totalram) ||
1131 __put_user (s.freeram, &info->freeram) ||
1132 __put_user (s.sharedram, &info->sharedram) ||
1133 __put_user (s.bufferram, &info->bufferram) ||
1134 __put_user (s.totalswap, &info->totalswap) ||
1135 __put_user (s.freeswap, &info->freeswap) ||
1136 __put_user (s.procs, &info->procs) ||
1137 __put_user (s.totalhigh, &info->totalhigh) ||
1138 __put_user (s.freehigh, &info->freehigh) ||
1139 __put_user (s.mem_unit, &info->mem_unit))
1140 return -EFAULT;
1141
1142 return 0;
1143 }
1144
1145 /*
1146 * Allocate user-space memory for the duration of a single system call,
1147 * in order to marshall parameters inside a compat thunk.
1148 */
compat_alloc_user_space(unsigned long len)1149 void __user *compat_alloc_user_space(unsigned long len)
1150 {
1151 void __user *ptr;
1152
1153 /* If len would occupy more than half of the entire compat space... */
1154 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1155 return NULL;
1156
1157 ptr = arch_compat_alloc_user_space(len);
1158
1159 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1160 return NULL;
1161
1162 return ptr;
1163 }
1164 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1165