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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6-block.git] / kernel / compat.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
1da177e4
LT		 20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
3158e941 23#include <linux/timex.h>
6e5fdeed 24#include <linux/export.h>
1b2db9fb 25#include <linux/migrate.h>
1711ef38 26#include <linux/posix-timers.h>
f06febc9 27#include <linux/times.h>
e3d5a27d 28#include <linux/ptrace.h>
5a0e3ad6 29#include <linux/gfp.h>
1da177e4
LT		 30
31#include <asm/uaccess.h>
1da177e4 32
b418da16 33/*
6684ba20 34 * Get/set struct timeval with struct timespec on the native side
b418da16 35 */
6684ba20
PA		 36static int compat_get_timeval_convert(struct timespec *o,
37 struct compat_timeval __user *i)
b418da16
CH		 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
6684ba20
PA		 48static int compat_put_timeval_convert(struct compat_timeval __user *o,
49 struct timeval *i)
b418da16
CH		 50{
51 return (put_user(i->tv_sec, &o->tv_sec) ||
52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
53}
54
65f5d80b
RC		 55static 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
85static 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
b418da16
CH		 113asmlinkage 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);
6684ba20 119 if (compat_put_timeval_convert(tv, &ktv))
b418da16
CH		 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
130asmlinkage 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) {
6684ba20 137 if (compat_get_timeval_convert(&kts, tv))
b418da16
CH		 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
6684ba20
PA		 148int 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}
154EXPORT_SYMBOL_GPL(get_compat_timeval);
155
156int 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}
162EXPORT_SYMBOL_GPL(put_compat_timeval);
163
1da177e4
LT		 164int 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}
6684ba20 170EXPORT_SYMBOL_GPL(get_compat_timespec);
1da177e4
LT		 171
172int 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}
2330fb82 178EXPORT_SYMBOL_GPL(put_compat_timespec);
1da177e4 179
6684ba20
PA		 180int 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}
187EXPORT_SYMBOL_GPL(compat_get_timeval);
188
189int 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}
196EXPORT_SYMBOL_GPL(compat_put_timeval);
197
198int 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}
205EXPORT_SYMBOL_GPL(compat_get_timespec);
206
207int 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}
214EXPORT_SYMBOL_GPL(compat_put_timespec);
215
41652937
ON		 216static 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
029a07e0 223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
41652937
ON		 224 oldfs = get_fs();
225 set_fs(KERNEL_DS);
226 ret = hrtimer_nanosleep_restart(restart);
227 set_fs(oldfs);
228
229 if (ret) {
029a07e0 230 rmtp = restart->nanosleep.compat_rmtp;
41652937
ON		 231
232 if (rmtp && put_compat_timespec(&rmt, rmtp))
233 return -EFAULT;
234 }
235
236 return ret;
237}
238
1da177e4 239asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
c70878b4 240 struct compat_timespec __user *rmtp)
1da177e4 241{
c70878b4 242 struct timespec tu, rmt;
41652937 243 mm_segment_t oldfs;
c70878b4 244 long ret;
1da177e4 245
c70878b4 246 if (get_compat_timespec(&tu, rqtp))
1da177e4
LT		 247 return -EFAULT;
248
c70878b4 249 if (!timespec_valid(&tu))
1da177e4
LT		 250 return -EINVAL;
251
41652937
ON		 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;
029a07e0 264 restart->nanosleep.compat_rmtp = rmtp;
1da177e4 265
41652937 266 if (rmtp && put_compat_timespec(&rmt, rmtp))
1da177e4
LT		 267 return -EFAULT;
268 }
c70878b4
AB		 269
270 return ret;
1da177e4
LT		 271}
272
273static 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
283static 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
293asmlinkage long compat_sys_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
305asmlinkage long compat_sys_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
f06febc9
FM		 326static 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
1da177e4
LT		 331asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
332{
1da177e4 333 if (tbuf) {
f06febc9 334 struct tms tms;
1da177e4 335 struct compat_tms tmp;
f06febc9
FM		 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);
1da177e4
LT		 343 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
344 return -EFAULT;
345 }
e3d5a27d 346 force_successful_syscall_return();
1da177e4
LT		 347 return compat_jiffies_to_clock_t(jiffies);
348}
349
be84cb43
CM		 350#ifdef __ARCH_WANT_SYS_SIGPENDING
351
1da177e4
LT		 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
357asmlinkage 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
be84cb43
CM		 371#endif
372
373#ifdef __ARCH_WANT_SYS_SIGPROCMASK
374
1da177e4
LT		 375asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
376 compat_old_sigset_t __user *oset)
377{
378 old_sigset_t s;
379 long ret;
380 mm_segment_t old_fs;
381
382 if (set && get_user(s, set))
383 return -EFAULT;
384 old_fs = get_fs();
385 set_fs(KERNEL_DS);
386 ret = sys_sigprocmask(how,
387 set ? (old_sigset_t __user *) &s : NULL,
388 oset ? (old_sigset_t __user *) &s : NULL);
389 set_fs(old_fs);
390 if (ret == 0)
391 if (oset)
392 ret = put_user(s, oset);
393 return ret;
394}
395
be84cb43
CM		 396#endif
397
1da177e4
LT		 398asmlinkage long compat_sys_setrlimit(unsigned int resource,
399 struct compat_rlimit __user *rlim)
400{
401 struct rlimit r;
1da177e4
LT		 402
403 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
404 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
405 __get_user(r.rlim_max, &rlim->rlim_max))
406 return -EFAULT;
407
408 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
409 r.rlim_cur = RLIM_INFINITY;
410 if (r.rlim_max == COMPAT_RLIM_INFINITY)
411 r.rlim_max = RLIM_INFINITY;
b9518345 412 return do_prlimit(current, resource, &r, NULL);
1da177e4
LT		 413}
414
415#ifdef COMPAT_RLIM_OLD_INFINITY
416
417asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
418 struct compat_rlimit __user *rlim)
419{
420 struct rlimit r;
421 int ret;
422 mm_segment_t old_fs = get_fs();
423
424 set_fs(KERNEL_DS);
425 ret = sys_old_getrlimit(resource, &r);
426 set_fs(old_fs);
427
428 if (!ret) {
429 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
430 r.rlim_cur = COMPAT_RLIM_INFINITY;
431 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
432 r.rlim_max = COMPAT_RLIM_INFINITY;
433
434 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
435 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
436 __put_user(r.rlim_max, &rlim->rlim_max))
437 return -EFAULT;
438 }
439 return ret;
440}
441
442#endif
443
b9518345 444asmlinkage long compat_sys_getrlimit(unsigned int resource,
1da177e4
LT		 445 struct compat_rlimit __user *rlim)
446{
447 struct rlimit r;
448 int ret;
1da177e4 449
b9518345 450 ret = do_prlimit(current, resource, NULL, &r);
1da177e4
LT		 451 if (!ret) {
452 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
453 r.rlim_cur = COMPAT_RLIM_INFINITY;
454 if (r.rlim_max > COMPAT_RLIM_INFINITY)
455 r.rlim_max = COMPAT_RLIM_INFINITY;
456
457 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
458 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
459 __put_user(r.rlim_max, &rlim->rlim_max))
460 return -EFAULT;
461 }
462 return ret;
463}
464
465int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
466{
467 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
468 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
469 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
470 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
471 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
472 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
473 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
474 __put_user(r->ru_idrss, &ru->ru_idrss) ||
475 __put_user(r->ru_isrss, &ru->ru_isrss) ||
476 __put_user(r->ru_minflt, &ru->ru_minflt) ||
477 __put_user(r->ru_majflt, &ru->ru_majflt) ||
478 __put_user(r->ru_nswap, &ru->ru_nswap) ||
479 __put_user(r->ru_inblock, &ru->ru_inblock) ||
480 __put_user(r->ru_oublock, &ru->ru_oublock) ||
481 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
482 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
483 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
484 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
485 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
486 return -EFAULT;
487 return 0;
488}
489
490asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
491{
492 struct rusage r;
493 int ret;
494 mm_segment_t old_fs = get_fs();
495
496 set_fs(KERNEL_DS);
497 ret = sys_getrusage(who, (struct rusage __user *) &r);
498 set_fs(old_fs);
499
500 if (ret)
501 return ret;
502
503 if (put_compat_rusage(&r, ru))
504 return -EFAULT;
505
506 return 0;
507}
508
509asmlinkage long
510compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
511 struct compat_rusage __user *ru)
512{
513 if (!ru) {
514 return sys_wait4(pid, stat_addr, options, NULL);
515 } else {
516 struct rusage r;
517 int ret;
518 unsigned int status;
519 mm_segment_t old_fs = get_fs();
520
521 set_fs (KERNEL_DS);
522 ret = sys_wait4(pid,
523 (stat_addr ?
524 (unsigned int __user *) &status : NULL),
525 options, (struct rusage __user *) &r);
526 set_fs (old_fs);
527
528 if (ret > 0) {
529 if (put_compat_rusage(&r, ru))
530 return -EFAULT;
531 if (stat_addr && put_user(status, stat_addr))
532 return -EFAULT;
533 }
534 return ret;
535 }
536}
537
538asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
539 struct compat_siginfo __user *uinfo, int options,
540 struct compat_rusage __user *uru)
541{
542 siginfo_t info;
543 struct rusage ru;
544 long ret;
545 mm_segment_t old_fs = get_fs();
546
547 memset(&info, 0, sizeof(info));
548
549 set_fs(KERNEL_DS);
550 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
551 uru ? (struct rusage __user *)&ru : NULL);
552 set_fs(old_fs);
553
554 if ((ret < 0) || (info.si_signo == 0))
555 return ret;
556
557 if (uru) {
558 ret = put_compat_rusage(&ru, uru);
559 if (ret)
560 return ret;
561 }
562
563 BUG_ON(info.si_code & __SI_MASK);
564 info.si_code |= __SI_CHLD;
565 return copy_siginfo_to_user32(uinfo, &info);
566}
567
568static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2 569 unsigned len, struct cpumask *new_mask)
1da177e4
LT		 570{
571 unsigned long *k;
572
a45185d2
RR		 573 if (len < cpumask_size())
574 memset(new_mask, 0, cpumask_size());
575 else if (len > cpumask_size())
576 len = cpumask_size();
1da177e4 577
a45185d2 578 k = cpumask_bits(new_mask);
1da177e4
LT		 579 return compat_get_bitmap(k, user_mask_ptr, len * 8);
580}
581
582asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
583 unsigned int len,
584 compat_ulong_t __user *user_mask_ptr)
585{
a45185d2 586 cpumask_var_t new_mask;
1da177e4
LT		 587 int retval;
588
a45185d2
RR		 589 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
590 return -ENOMEM;
591
592 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4 593 if (retval)
a45185d2 594 goto out;
1da177e4 595
a45185d2
RR		 596 retval = sched_setaffinity(pid, new_mask);
597out:
598 free_cpumask_var(new_mask);
599 return retval;
1da177e4
LT		 600}
601
602asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
603 compat_ulong_t __user *user_mask_ptr)
604{
605 int ret;
a45185d2 606 cpumask_var_t mask;
1da177e4 607
fa9dc265
KM		 608 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
609 return -EINVAL;
610 if (len & (sizeof(compat_ulong_t)-1))
1da177e4
LT		 611 return -EINVAL;
612
a45185d2
RR		 613 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
614 return -ENOMEM;
615
616 ret = sched_getaffinity(pid, mask);
fa9dc265
KM		 617 if (ret == 0) {
618 size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4 619
fa9dc265
KM		 620 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
621 ret = -EFAULT;
622 else
623 ret = retlen;
624 }
a45185d2 625 free_cpumask_var(mask);
fa9dc265 626
a45185d2 627 return ret;
1da177e4
LT		 628}
629
83f5d126
DL		 630int get_compat_itimerspec(struct itimerspec *dst,
631 const struct compat_itimerspec __user *src)
bd3a8492 632{
1da177e4
LT		 633 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
634 get_compat_timespec(&dst->it_value, &src->it_value))
635 return -EFAULT;
636 return 0;
bd3a8492 637}
1da177e4 638
83f5d126
DL		 639int put_compat_itimerspec(struct compat_itimerspec __user *dst,
640 const struct itimerspec *src)
bd3a8492 641{
1da177e4
LT		 642 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
643 put_compat_timespec(&src->it_value, &dst->it_value))
644 return -EFAULT;
645 return 0;
bd3a8492 646}
1da177e4 647
3a0f69d5
CH		 648long compat_sys_timer_create(clockid_t which_clock,
649 struct compat_sigevent __user *timer_event_spec,
650 timer_t __user *created_timer_id)
651{
652 struct sigevent __user *event = NULL;
653
654 if (timer_event_spec) {
655 struct sigevent kevent;
656
657 event = compat_alloc_user_space(sizeof(*event));
658 if (get_compat_sigevent(&kevent, timer_event_spec) ||
659 copy_to_user(event, &kevent, sizeof(*event)))
660 return -EFAULT;
661 }
662
663 return sys_timer_create(which_clock, event, created_timer_id);
664}
665
1da177e4 666long compat_sys_timer_settime(timer_t timer_id, int flags,
bd3a8492 667 struct compat_itimerspec __user *new,
1da177e4 668 struct compat_itimerspec __user *old)
bd3a8492 669{
1da177e4
LT		 670 long err;
671 mm_segment_t oldfs;
672 struct itimerspec newts, oldts;
673
674 if (!new)
675 return -EINVAL;
676 if (get_compat_itimerspec(&newts, new))
bd3a8492 677 return -EFAULT;
1da177e4
LT		 678 oldfs = get_fs();
679 set_fs(KERNEL_DS);
680 err = sys_timer_settime(timer_id, flags,
681 (struct itimerspec __user *) &newts,
682 (struct itimerspec __user *) &oldts);
bd3a8492 683 set_fs(oldfs);
1da177e4
LT		 684 if (!err && old && put_compat_itimerspec(old, &oldts))
685 return -EFAULT;
686 return err;
bd3a8492 687}
1da177e4
LT		 688
689long compat_sys_timer_gettime(timer_t timer_id,
690 struct compat_itimerspec __user *setting)
bd3a8492 691{
1da177e4
LT		 692 long err;
693 mm_segment_t oldfs;
bd3a8492 694 struct itimerspec ts;
1da177e4
LT		 695
696 oldfs = get_fs();
697 set_fs(KERNEL_DS);
698 err = sys_timer_gettime(timer_id,
bd3a8492
DW		 699 (struct itimerspec __user *) &ts);
700 set_fs(oldfs);
1da177e4
LT		 701 if (!err && put_compat_itimerspec(setting, &ts))
702 return -EFAULT;
703 return err;
bd3a8492 704}
1da177e4
LT		 705
706long compat_sys_clock_settime(clockid_t which_clock,
707 struct compat_timespec __user *tp)
708{
709 long err;
710 mm_segment_t oldfs;
bd3a8492 711 struct timespec ts;
1da177e4
LT		 712
713 if (get_compat_timespec(&ts, tp))
bd3a8492 714 return -EFAULT;
1da177e4 715 oldfs = get_fs();
bd3a8492 716 set_fs(KERNEL_DS);
1da177e4
LT		 717 err = sys_clock_settime(which_clock,
718 (struct timespec __user *) &ts);
719 set_fs(oldfs);
720 return err;
bd3a8492 721}
1da177e4
LT		 722
723long compat_sys_clock_gettime(clockid_t which_clock,
724 struct compat_timespec __user *tp)
725{
726 long err;
727 mm_segment_t oldfs;
bd3a8492 728 struct timespec ts;
1da177e4
LT		 729
730 oldfs = get_fs();
731 set_fs(KERNEL_DS);
732 err = sys_clock_gettime(which_clock,
733 (struct timespec __user *) &ts);
734 set_fs(oldfs);
735 if (!err && put_compat_timespec(&ts, tp))
bd3a8492 736 return -EFAULT;
1da177e4 737 return err;
bd3a8492 738}
1da177e4 739
f1f1d5eb
RC		 740long compat_sys_clock_adjtime(clockid_t which_clock,
741 struct compat_timex __user *utp)
742{
743 struct timex txc;
744 mm_segment_t oldfs;
745 int err, ret;
746
747 err = compat_get_timex(&txc, utp);
748 if (err)
749 return err;
750
751 oldfs = get_fs();
752 set_fs(KERNEL_DS);
753 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
754 set_fs(oldfs);
755
756 err = compat_put_timex(utp, &txc);
757 if (err)
758 return err;
759
760 return ret;
761}
762
1da177e4
LT		 763long compat_sys_clock_getres(clockid_t which_clock,
764 struct compat_timespec __user *tp)
765{
766 long err;
767 mm_segment_t oldfs;
bd3a8492 768 struct timespec ts;
1da177e4
LT		 769
770 oldfs = get_fs();
771 set_fs(KERNEL_DS);
772 err = sys_clock_getres(which_clock,
773 (struct timespec __user *) &ts);
774 set_fs(oldfs);
775 if (!err && tp && put_compat_timespec(&ts, tp))
bd3a8492 776 return -EFAULT;
1da177e4 777 return err;
bd3a8492 778}
1da177e4 779
1711ef38
TA		 780static long compat_clock_nanosleep_restart(struct restart_block *restart)
781{
782 long err;
783 mm_segment_t oldfs;
784 struct timespec tu;
029a07e0 785 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
1711ef38 786
029a07e0 787 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
1711ef38
TA		 788 oldfs = get_fs();
789 set_fs(KERNEL_DS);
790 err = clock_nanosleep_restart(restart);
791 set_fs(oldfs);
792
793 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
794 put_compat_timespec(&tu, rmtp))
795 return -EFAULT;
796
797 if (err == -ERESTART_RESTARTBLOCK) {
798 restart->fn = compat_clock_nanosleep_restart;
029a07e0 799 restart->nanosleep.compat_rmtp = rmtp;
1711ef38
TA		 800 }
801 return err;
802}
803
1da177e4
LT		 804long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
805 struct compat_timespec __user *rqtp,
806 struct compat_timespec __user *rmtp)
807{
808 long err;
809 mm_segment_t oldfs;
bd3a8492 810 struct timespec in, out;
1711ef38 811 struct restart_block *restart;
1da177e4 812
bd3a8492 813 if (get_compat_timespec(&in, rqtp))
1da177e4
LT		 814 return -EFAULT;
815
816 oldfs = get_fs();
817 set_fs(KERNEL_DS);
818 err = sys_clock_nanosleep(which_clock, flags,
819 (struct timespec __user *) &in,
820 (struct timespec __user *) &out);
821 set_fs(oldfs);
1711ef38 822
1da177e4
LT		 823 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
824 put_compat_timespec(&out, rmtp))
825 return -EFAULT;
1711ef38
TA		 826
827 if (err == -ERESTART_RESTARTBLOCK) {
828 restart = &current_thread_info()->restart_block;
829 restart->fn = compat_clock_nanosleep_restart;
029a07e0 830 restart->nanosleep.compat_rmtp = rmtp;
1711ef38 831 }
bd3a8492
DW		 832 return err;
833}
1da177e4
LT		 834
835/*
836 * We currently only need the following fields from the sigevent
837 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
838 * sigev_notify_thread_id). The others are handled in user mode.
839 * We also assume that copying sigev_value.sival_int is sufficient
840 * to keep all the bits of sigev_value.sival_ptr intact.
841 */
842int get_compat_sigevent(struct sigevent *event,
843 const struct compat_sigevent __user *u_event)
844{
51410d3c 845 memset(event, 0, sizeof(*event));
1da177e4
LT		 846 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
847 __get_user(event->sigev_value.sival_int,
848 &u_event->sigev_value.sival_int) ||
849 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
850 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
851 __get_user(event->sigev_notify_thread_id,
852 &u_event->sigev_notify_thread_id))
853 ? -EFAULT : 0;
854}
855
5fa3839a 856long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
1da177e4
LT		 857 unsigned long bitmap_size)
858{
859 int i, j;
860 unsigned long m;
861 compat_ulong_t um;
862 unsigned long nr_compat_longs;
863
864 /* align bitmap up to nearest compat_long_t boundary */
865 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
866
867 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
868 return -EFAULT;
869
870 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
871
872 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
873 m = 0;
874
875 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
876 /*
877 * We dont want to read past the end of the userspace
878 * bitmap. We must however ensure the end of the
879 * kernel bitmap is zeroed.
880 */
881 if (nr_compat_longs-- > 0) {
882 if (__get_user(um, umask))
883 return -EFAULT;
884 } else {
885 um = 0;
886 }
887
888 umask++;
889 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
890 }
891 *mask++ = m;
892 }
893
894 return 0;
895}
896
897long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
898 unsigned long bitmap_size)
899{
900 int i, j;
901 unsigned long m;
902 compat_ulong_t um;
903 unsigned long nr_compat_longs;
904
905 /* align bitmap up to nearest compat_long_t boundary */
906 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
907
908 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
909 return -EFAULT;
910
911 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
912
913 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
914 m = *mask++;
915
916 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
917 um = m;
918
919 /*
920 * We dont want to write past the end of the userspace
921 * bitmap.
922 */
923 if (nr_compat_longs-- > 0) {
924 if (__put_user(um, umask))
925 return -EFAULT;
926 }
927
928 umask++;
929 m >>= 4*sizeof(um);
930 m >>= 4*sizeof(um);
931 }
932 }
933
934 return 0;
935}
936
937void
938sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
939{
940 switch (_NSIG_WORDS) {
1da177e4
LT		 941 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
942 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
943 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
944 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
1da177e4
LT		 945 }
946}
1dda606c 947EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4
LT		 948
949asmlinkage long
950compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
951 struct compat_siginfo __user *uinfo,
952 struct compat_timespec __user *uts, compat_size_t sigsetsize)
953{
954 compat_sigset_t s32;
955 sigset_t s;
1da177e4
LT		 956 struct timespec t;
957 siginfo_t info;
943df148 958 long ret;
1da177e4
LT		 959
960 if (sigsetsize != sizeof(sigset_t))
961 return -EINVAL;
962
963 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
964 return -EFAULT;
965 sigset_from_compat(&s, &s32);
1da177e4
LT		 966
967 if (uts) {
943df148 968 if (get_compat_timespec(&t, uts))
1da177e4 969 return -EFAULT;
1da177e4
LT		 970 }
971
943df148 972 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1da177e4 973
943df148
ON		 974 if (ret > 0 && uinfo) {
975 if (copy_siginfo_to_user32(uinfo, &info))
976 ret = -EFAULT;
1da177e4 977 }
943df148 978
1da177e4
LT		 979 return ret;
980
981}
982
62ab4505
TG		 983asmlinkage long
984compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
985 struct compat_siginfo __user *uinfo)
986{
987 siginfo_t info;
988
989 if (copy_siginfo_from_user32(&info, uinfo))
990 return -EFAULT;
991 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
992}
993
1da177e4
LT		 994#ifdef __ARCH_WANT_COMPAT_SYS_TIME
995
996/* compat_time_t is a 32 bit "long" and needs to get converted. */
997
998asmlinkage long compat_sys_time(compat_time_t __user * tloc)
999{
1000 compat_time_t i;
1001 struct timeval tv;
1002
1003 do_gettimeofday(&tv);
1004 i = tv.tv_sec;
1005
1006 if (tloc) {
1007 if (put_user(i,tloc))
e3d5a27d 1008 return -EFAULT;
1da177e4 1009 }
e3d5a27d 1010 force_successful_syscall_return();
1da177e4
LT		 1011 return i;
1012}
1013
1014asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
1015{
1016 struct timespec tv;
1017 int err;
1018
1019 if (get_user(tv.tv_sec, tptr))
1020 return -EFAULT;
1021
1022 tv.tv_nsec = 0;
1023
1024 err = security_settime(&tv, NULL);
1025 if (err)
1026 return err;
1027
1028 do_settimeofday(&tv);
1029 return 0;
1030}
1031
1032#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
150256d8
DW		 1033
1034#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
1035asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
1036{
1037 sigset_t newset;
1038 compat_sigset_t newset32;
1039
1040 /* XXX: Don't preclude handling different sized sigset_t's. */
1041 if (sigsetsize != sizeof(sigset_t))
1042 return -EINVAL;
1043
1044 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
1045 return -EFAULT;
1046 sigset_from_compat(&newset, &newset32);
1047 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1048
150256d8 1049 current->saved_sigmask = current->blocked;
c1095c6d 1050 set_current_blocked(&newset);
150256d8
DW		 1051
1052 current->state = TASK_INTERRUPTIBLE;
1053 schedule();
4e4c22c7 1054 set_restore_sigmask();
150256d8
DW		 1055 return -ERESTARTNOHAND;
1056}
1057#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
3158e941
SR		 1058
1059asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
1060{
1061 struct timex txc;
65f5d80b 1062 int err, ret;
3158e941 1063
65f5d80b
RC		 1064 err = compat_get_timex(&txc, utp);
1065 if (err)
1066 return err;
3158e941
SR		 1067
1068 ret = do_adjtimex(&txc);
1069
65f5d80b
RC		 1070 err = compat_put_timex(utp, &txc);
1071 if (err)
1072 return err;
3158e941
SR		 1073
1074 return ret;
1075}
1b2db9fb
CL		 1076
1077#ifdef CONFIG_NUMA
1078asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
9216dfad 1079 compat_uptr_t __user *pages32,
1b2db9fb
CL		 1080 const int __user *nodes,
1081 int __user *status,
1082 int flags)
1083{
1084 const void __user * __user *pages;
1085 int i;
1086
1087 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1088 for (i = 0; i < nr_pages; i++) {
1089 compat_uptr_t p;
1090
9216dfad 1091 if (get_user(p, pages32 + i) ||
1b2db9fb
CL		 1092 put_user(compat_ptr(p), pages + i))
1093 return -EFAULT;
1094 }
1095 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1096}
3fd59397
SR		 1097
1098asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
1099 compat_ulong_t maxnode,
1100 const compat_ulong_t __user *old_nodes,
1101 const compat_ulong_t __user *new_nodes)
1102{
1103 unsigned long __user *old = NULL;
1104 unsigned long __user *new = NULL;
1105 nodemask_t tmp_mask;
1106 unsigned long nr_bits;
1107 unsigned long size;
1108
1109 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1110 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1111 if (old_nodes) {
1112 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1113 return -EFAULT;
1114 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1115 if (new_nodes)
1116 new = old + size / sizeof(unsigned long);
1117 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1118 return -EFAULT;
1119 }
1120 if (new_nodes) {
1121 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1122 return -EFAULT;
1123 if (new == NULL)
1124 new = compat_alloc_user_space(size);
1125 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1126 return -EFAULT;
1127 }
1128 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1129}
1b2db9fb 1130#endif
d4d23add
KM		 1131
1132struct compat_sysinfo {
1133 s32 uptime;
1134 u32 loads[3];
1135 u32 totalram;
1136 u32 freeram;
1137 u32 sharedram;
1138 u32 bufferram;
1139 u32 totalswap;
1140 u32 freeswap;
1141 u16 procs;
1142 u16 pad;
1143 u32 totalhigh;
1144 u32 freehigh;
1145 u32 mem_unit;
1146 char _f[20-2*sizeof(u32)-sizeof(int)];
1147};
1148
1149asmlinkage long
1150compat_sys_sysinfo(struct compat_sysinfo __user *info)
1151{
1152 struct sysinfo s;
1153
1154 do_sysinfo(&s);
1155
1156 /* Check to see if any memory value is too large for 32-bit and scale
1157 * down if needed
1158 */
1159 if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1160 int bitcount = 0;
1161
1162 while (s.mem_unit < PAGE_SIZE) {
1163 s.mem_unit <<= 1;
1164 bitcount++;
1165 }
1166
1167 s.totalram >>= bitcount;
1168 s.freeram >>= bitcount;
1169 s.sharedram >>= bitcount;
1170 s.bufferram >>= bitcount;
1171 s.totalswap >>= bitcount;
1172 s.freeswap >>= bitcount;
1173 s.totalhigh >>= bitcount;
1174 s.freehigh >>= bitcount;
1175 }
1176
1177 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1178 __put_user (s.uptime, &info->uptime) ||
1179 __put_user (s.loads[0], &info->loads[0]) ||
1180 __put_user (s.loads[1], &info->loads[1]) ||
1181 __put_user (s.loads[2], &info->loads[2]) ||
1182 __put_user (s.totalram, &info->totalram) ||
1183 __put_user (s.freeram, &info->freeram) ||
1184 __put_user (s.sharedram, &info->sharedram) ||
1185 __put_user (s.bufferram, &info->bufferram) ||
1186 __put_user (s.totalswap, &info->totalswap) ||
1187 __put_user (s.freeswap, &info->freeswap) ||
1188 __put_user (s.procs, &info->procs) ||
1189 __put_user (s.totalhigh, &info->totalhigh) ||
1190 __put_user (s.freehigh, &info->freehigh) ||
1191 __put_user (s.mem_unit, &info->mem_unit))
1192 return -EFAULT;
1193
1194 return 0;
1195}
c41d68a5
PA		 1196
1197/*
1198 * Allocate user-space memory for the duration of a single system call,
1199 * in order to marshall parameters inside a compat thunk.
1200 */
1201void __user *compat_alloc_user_space(unsigned long len)
1202{
1203 void __user *ptr;
1204
1205 /* If len would occupy more than half of the entire compat space... */
1206 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1207 return NULL;
1208
1209 ptr = arch_compat_alloc_user_space(len);
1210
1211 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1212 return NULL;
1213
1214 return ptr;
1215}
1216EXPORT_SYMBOL_GPL(compat_alloc_user_space);
Linux 6.x block layer and io_uring tree(s)