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1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
23#include <linux/timex.h>
24#include <linux/export.h>
25#include <linux/migrate.h>
26#include <linux/posix-timers.h>
27#include <linux/times.h>
28#include <linux/ptrace.h>
29#include <linux/gfp.h>
30
31#include <linux/uaccess.h>
32
33int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
34{
35 struct compat_timex tx32;
36
37 memset(txc, 0, sizeof(struct timex));
38 if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
39 return -EFAULT;
40
41 txc->modes = tx32.modes;
42 txc->offset = tx32.offset;
43 txc->freq = tx32.freq;
44 txc->maxerror = tx32.maxerror;
45 txc->esterror = tx32.esterror;
46 txc->status = tx32.status;
47 txc->constant = tx32.constant;
48 txc->precision = tx32.precision;
49 txc->tolerance = tx32.tolerance;
50 txc->time.tv_sec = tx32.time.tv_sec;
51 txc->time.tv_usec = tx32.time.tv_usec;
52 txc->tick = tx32.tick;
53 txc->ppsfreq = tx32.ppsfreq;
54 txc->jitter = tx32.jitter;
55 txc->shift = tx32.shift;
56 txc->stabil = tx32.stabil;
57 txc->jitcnt = tx32.jitcnt;
58 txc->calcnt = tx32.calcnt;
59 txc->errcnt = tx32.errcnt;
60 txc->stbcnt = tx32.stbcnt;
61
62 return 0;
63}
64
65int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc)
66{
67 struct compat_timex tx32;
68
69 memset(&tx32, 0, sizeof(struct compat_timex));
70 tx32.modes = txc->modes;
71 tx32.offset = txc->offset;
72 tx32.freq = txc->freq;
73 tx32.maxerror = txc->maxerror;
74 tx32.esterror = txc->esterror;
75 tx32.status = txc->status;
76 tx32.constant = txc->constant;
77 tx32.precision = txc->precision;
78 tx32.tolerance = txc->tolerance;
79 tx32.time.tv_sec = txc->time.tv_sec;
80 tx32.time.tv_usec = txc->time.tv_usec;
81 tx32.tick = txc->tick;
82 tx32.ppsfreq = txc->ppsfreq;
83 tx32.jitter = txc->jitter;
84 tx32.shift = txc->shift;
85 tx32.stabil = txc->stabil;
86 tx32.jitcnt = txc->jitcnt;
87 tx32.calcnt = txc->calcnt;
88 tx32.errcnt = txc->errcnt;
89 tx32.stbcnt = txc->stbcnt;
90 tx32.tai = txc->tai;
91 if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
92 return -EFAULT;
93 return 0;
94}
95
96static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
97{
98 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
99 __get_user(tv->tv_sec, &ctv->tv_sec) ||
100 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
101}
102
103static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
104{
105 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
106 __put_user(tv->tv_sec, &ctv->tv_sec) ||
107 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
108}
109
110static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
111{
112 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
113 __get_user(ts->tv_sec, &cts->tv_sec) ||
114 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
115}
116
117static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
118{
119 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
120 __put_user(ts->tv_sec, &cts->tv_sec) ||
121 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
122}
123
124static int __compat_get_timespec64(struct timespec64 *ts64,
125 const struct compat_timespec __user *cts)
126{
127 struct compat_timespec ts;
128 int ret;
129
130 ret = copy_from_user(&ts, cts, sizeof(ts));
131 if (ret)
132 return -EFAULT;
133
134 ts64->tv_sec = ts.tv_sec;
135 ts64->tv_nsec = ts.tv_nsec;
136
137 return 0;
138}
139
140static int __compat_put_timespec64(const struct timespec64 *ts64,
141 struct compat_timespec __user *cts)
142{
143 struct compat_timespec ts = {
144 .tv_sec = ts64->tv_sec,
145 .tv_nsec = ts64->tv_nsec
146 };
147 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
148}
149
150int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
151{
152 if (COMPAT_USE_64BIT_TIME)
153 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
154 else
155 return __compat_get_timespec64(ts, uts);
156}
157EXPORT_SYMBOL_GPL(compat_get_timespec64);
158
159int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
160{
161 if (COMPAT_USE_64BIT_TIME)
162 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
163 else
164 return __compat_put_timespec64(ts, uts);
165}
166EXPORT_SYMBOL_GPL(compat_put_timespec64);
167
168int compat_get_timeval(struct timeval *tv, const void __user *utv)
169{
170 if (COMPAT_USE_64BIT_TIME)
171 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
172 else
173 return __compat_get_timeval(tv, utv);
174}
175EXPORT_SYMBOL_GPL(compat_get_timeval);
176
177int compat_put_timeval(const struct timeval *tv, void __user *utv)
178{
179 if (COMPAT_USE_64BIT_TIME)
180 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
181 else
182 return __compat_put_timeval(tv, utv);
183}
184EXPORT_SYMBOL_GPL(compat_put_timeval);
185
186int compat_get_timespec(struct timespec *ts, const void __user *uts)
187{
188 if (COMPAT_USE_64BIT_TIME)
189 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
190 else
191 return __compat_get_timespec(ts, uts);
192}
193EXPORT_SYMBOL_GPL(compat_get_timespec);
194
195int compat_put_timespec(const struct timespec *ts, void __user *uts)
196{
197 if (COMPAT_USE_64BIT_TIME)
198 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
199 else
200 return __compat_put_timespec(ts, uts);
201}
202EXPORT_SYMBOL_GPL(compat_put_timespec);
203
204int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
205{
206 struct compat_itimerval v32;
207
208 if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
209 return -EFAULT;
210 o->it_interval.tv_sec = v32.it_interval.tv_sec;
211 o->it_interval.tv_usec = v32.it_interval.tv_usec;
212 o->it_value.tv_sec = v32.it_value.tv_sec;
213 o->it_value.tv_usec = v32.it_value.tv_usec;
214 return 0;
215}
216
217int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i)
218{
219 struct compat_itimerval v32;
220
221 v32.it_interval.tv_sec = i->it_interval.tv_sec;
222 v32.it_interval.tv_usec = i->it_interval.tv_usec;
223 v32.it_value.tv_sec = i->it_value.tv_sec;
224 v32.it_value.tv_usec = i->it_value.tv_usec;
225 return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
226}
227
228#ifdef __ARCH_WANT_SYS_SIGPROCMASK
229
230/*
231 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
232 * blocked set of signals to the supplied signal set
233 */
234static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
235{
236 memcpy(blocked->sig, &set, sizeof(set));
237}
238
239COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
240 compat_old_sigset_t __user *, nset,
241 compat_old_sigset_t __user *, oset)
242{
243 old_sigset_t old_set, new_set;
244 sigset_t new_blocked;
245
246 old_set = current->blocked.sig[0];
247
248 if (nset) {
249 if (get_user(new_set, nset))
250 return -EFAULT;
251 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
252
253 new_blocked = current->blocked;
254
255 switch (how) {
256 case SIG_BLOCK:
257 sigaddsetmask(&new_blocked, new_set);
258 break;
259 case SIG_UNBLOCK:
260 sigdelsetmask(&new_blocked, new_set);
261 break;
262 case SIG_SETMASK:
263 compat_sig_setmask(&new_blocked, new_set);
264 break;
265 default:
266 return -EINVAL;
267 }
268
269 set_current_blocked(&new_blocked);
270 }
271
272 if (oset) {
273 if (put_user(old_set, oset))
274 return -EFAULT;
275 }
276
277 return 0;
278}
279
280#endif
281
282int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
283{
284 struct compat_rusage r32;
285 memset(&r32, 0, sizeof(r32));
286 r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
287 r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
288 r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
289 r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
290 r32.ru_maxrss = r->ru_maxrss;
291 r32.ru_ixrss = r->ru_ixrss;
292 r32.ru_idrss = r->ru_idrss;
293 r32.ru_isrss = r->ru_isrss;
294 r32.ru_minflt = r->ru_minflt;
295 r32.ru_majflt = r->ru_majflt;
296 r32.ru_nswap = r->ru_nswap;
297 r32.ru_inblock = r->ru_inblock;
298 r32.ru_oublock = r->ru_oublock;
299 r32.ru_msgsnd = r->ru_msgsnd;
300 r32.ru_msgrcv = r->ru_msgrcv;
301 r32.ru_nsignals = r->ru_nsignals;
302 r32.ru_nvcsw = r->ru_nvcsw;
303 r32.ru_nivcsw = r->ru_nivcsw;
304 if (copy_to_user(ru, &r32, sizeof(r32)))
305 return -EFAULT;
306 return 0;
307}
308
309static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
310 unsigned len, struct cpumask *new_mask)
311{
312 unsigned long *k;
313
314 if (len < cpumask_size())
315 memset(new_mask, 0, cpumask_size());
316 else if (len > cpumask_size())
317 len = cpumask_size();
318
319 k = cpumask_bits(new_mask);
320 return compat_get_bitmap(k, user_mask_ptr, len * 8);
321}
322
323COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
324 unsigned int, len,
325 compat_ulong_t __user *, user_mask_ptr)
326{
327 cpumask_var_t new_mask;
328 int retval;
329
330 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
331 return -ENOMEM;
332
333 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
334 if (retval)
335 goto out;
336
337 retval = sched_setaffinity(pid, new_mask);
338out:
339 free_cpumask_var(new_mask);
340 return retval;
341}
342
343COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
344 compat_ulong_t __user *, user_mask_ptr)
345{
346 int ret;
347 cpumask_var_t mask;
348
349 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
350 return -EINVAL;
351 if (len & (sizeof(compat_ulong_t)-1))
352 return -EINVAL;
353
354 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
355 return -ENOMEM;
356
357 ret = sched_getaffinity(pid, mask);
358 if (ret == 0) {
359 unsigned int retlen = min(len, cpumask_size());
360
361 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
362 ret = -EFAULT;
363 else
364 ret = retlen;
365 }
366 free_cpumask_var(mask);
367
368 return ret;
369}
370
371int get_compat_itimerspec64(struct itimerspec64 *its,
372 const struct compat_itimerspec __user *uits)
373{
374
375 if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) ||
376 __compat_get_timespec64(&its->it_value, &uits->it_value))
377 return -EFAULT;
378 return 0;
379}
380EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
381
382int put_compat_itimerspec64(const struct itimerspec64 *its,
383 struct compat_itimerspec __user *uits)
384{
385 if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) ||
386 __compat_put_timespec64(&its->it_value, &uits->it_value))
387 return -EFAULT;
388 return 0;
389}
390EXPORT_SYMBOL_GPL(put_compat_itimerspec64);
391
392/*
393 * We currently only need the following fields from the sigevent
394 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
395 * sigev_notify_thread_id). The others are handled in user mode.
396 * We also assume that copying sigev_value.sival_int is sufficient
397 * to keep all the bits of sigev_value.sival_ptr intact.
398 */
399int get_compat_sigevent(struct sigevent *event,
400 const struct compat_sigevent __user *u_event)
401{
402 memset(event, 0, sizeof(*event));
403 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
404 __get_user(event->sigev_value.sival_int,
405 &u_event->sigev_value.sival_int) ||
406 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
407 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
408 __get_user(event->sigev_notify_thread_id,
409 &u_event->sigev_notify_thread_id))
410 ? -EFAULT : 0;
411}
412
413long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
414 unsigned long bitmap_size)
415{
416 unsigned long nr_compat_longs;
417
418 /* align bitmap up to nearest compat_long_t boundary */
419 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
420 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
421
422 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
423 return -EFAULT;
424
425 user_access_begin();
426 while (nr_compat_longs > 1) {
427 compat_ulong_t l1, l2;
428 unsafe_get_user(l1, umask++, Efault);
429 unsafe_get_user(l2, umask++, Efault);
430 *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
431 nr_compat_longs -= 2;
432 }
433 if (nr_compat_longs)
434 unsafe_get_user(*mask, umask++, Efault);
435 user_access_end();
436 return 0;
437
438Efault:
439 user_access_end();
440 return -EFAULT;
441}
442
443long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
444 unsigned long bitmap_size)
445{
446 unsigned long nr_compat_longs;
447
448 /* align bitmap up to nearest compat_long_t boundary */
449 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
450 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
451
452 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
453 return -EFAULT;
454
455 user_access_begin();
456 while (nr_compat_longs > 1) {
457 unsigned long m = *mask++;
458 unsafe_put_user((compat_ulong_t)m, umask++, Efault);
459 unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
460 nr_compat_longs -= 2;
461 }
462 if (nr_compat_longs)
463 unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
464 user_access_end();
465 return 0;
466Efault:
467 user_access_end();
468 return -EFAULT;
469}
470
471int
472get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
473{
474#ifdef __BIG_ENDIAN
475 compat_sigset_t v;
476 if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
477 return -EFAULT;
478 switch (_NSIG_WORDS) {
479 case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
480 case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
481 case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
482 case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
483 }
484#else
485 if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
486 return -EFAULT;
487#endif
488 return 0;
489}
490EXPORT_SYMBOL_GPL(get_compat_sigset);
491
492/*
493 * Allocate user-space memory for the duration of a single system call,
494 * in order to marshall parameters inside a compat thunk.
495 */
496void __user *compat_alloc_user_space(unsigned long len)
497{
498 void __user *ptr;
499
500 /* If len would occupy more than half of the entire compat space... */
501 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
502 return NULL;
503
504 ptr = arch_compat_alloc_user_space(len);
505
506 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
507 return NULL;
508
509 return ptr;
510}
511EXPORT_SYMBOL_GPL(compat_alloc_user_space);
1/*
2 * linux/kernel/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/linkage.h>
15#include <linux/compat.h>
16#include <linux/errno.h>
17#include <linux/time.h>
18#include <linux/signal.h>
19#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20#include <linux/syscalls.h>
21#include <linux/unistd.h>
22#include <linux/security.h>
23#include <linux/timex.h>
24#include <linux/export.h>
25#include <linux/migrate.h>
26#include <linux/posix-timers.h>
27#include <linux/times.h>
28#include <linux/ptrace.h>
29#include <linux/gfp.h>
30
31#include <linux/uaccess.h>
32
33static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
34{
35 memset(txc, 0, sizeof(struct timex));
36
37 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
38 __get_user(txc->modes, &utp->modes) ||
39 __get_user(txc->offset, &utp->offset) ||
40 __get_user(txc->freq, &utp->freq) ||
41 __get_user(txc->maxerror, &utp->maxerror) ||
42 __get_user(txc->esterror, &utp->esterror) ||
43 __get_user(txc->status, &utp->status) ||
44 __get_user(txc->constant, &utp->constant) ||
45 __get_user(txc->precision, &utp->precision) ||
46 __get_user(txc->tolerance, &utp->tolerance) ||
47 __get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
48 __get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
49 __get_user(txc->tick, &utp->tick) ||
50 __get_user(txc->ppsfreq, &utp->ppsfreq) ||
51 __get_user(txc->jitter, &utp->jitter) ||
52 __get_user(txc->shift, &utp->shift) ||
53 __get_user(txc->stabil, &utp->stabil) ||
54 __get_user(txc->jitcnt, &utp->jitcnt) ||
55 __get_user(txc->calcnt, &utp->calcnt) ||
56 __get_user(txc->errcnt, &utp->errcnt) ||
57 __get_user(txc->stbcnt, &utp->stbcnt))
58 return -EFAULT;
59
60 return 0;
61}
62
63static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
64{
65 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
66 __put_user(txc->modes, &utp->modes) ||
67 __put_user(txc->offset, &utp->offset) ||
68 __put_user(txc->freq, &utp->freq) ||
69 __put_user(txc->maxerror, &utp->maxerror) ||
70 __put_user(txc->esterror, &utp->esterror) ||
71 __put_user(txc->status, &utp->status) ||
72 __put_user(txc->constant, &utp->constant) ||
73 __put_user(txc->precision, &utp->precision) ||
74 __put_user(txc->tolerance, &utp->tolerance) ||
75 __put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
76 __put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
77 __put_user(txc->tick, &utp->tick) ||
78 __put_user(txc->ppsfreq, &utp->ppsfreq) ||
79 __put_user(txc->jitter, &utp->jitter) ||
80 __put_user(txc->shift, &utp->shift) ||
81 __put_user(txc->stabil, &utp->stabil) ||
82 __put_user(txc->jitcnt, &utp->jitcnt) ||
83 __put_user(txc->calcnt, &utp->calcnt) ||
84 __put_user(txc->errcnt, &utp->errcnt) ||
85 __put_user(txc->stbcnt, &utp->stbcnt) ||
86 __put_user(txc->tai, &utp->tai))
87 return -EFAULT;
88 return 0;
89}
90
91COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
92 struct timezone __user *, tz)
93{
94 if (tv) {
95 struct timeval ktv;
96 do_gettimeofday(&ktv);
97 if (compat_put_timeval(&ktv, tv))
98 return -EFAULT;
99 }
100 if (tz) {
101 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
102 return -EFAULT;
103 }
104
105 return 0;
106}
107
108COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
109 struct timezone __user *, tz)
110{
111 struct timeval user_tv;
112 struct timespec new_ts;
113 struct timezone new_tz;
114
115 if (tv) {
116 if (compat_get_timeval(&user_tv, tv))
117 return -EFAULT;
118 new_ts.tv_sec = user_tv.tv_sec;
119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
120 }
121 if (tz) {
122 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
123 return -EFAULT;
124 }
125
126 return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
127}
128
129static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
130{
131 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
132 __get_user(tv->tv_sec, &ctv->tv_sec) ||
133 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
134}
135
136static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
137{
138 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
139 __put_user(tv->tv_sec, &ctv->tv_sec) ||
140 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
141}
142
143static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
144{
145 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
146 __get_user(ts->tv_sec, &cts->tv_sec) ||
147 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
148}
149
150static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
151{
152 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
153 __put_user(ts->tv_sec, &cts->tv_sec) ||
154 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
155}
156
157int compat_get_timeval(struct timeval *tv, const void __user *utv)
158{
159 if (COMPAT_USE_64BIT_TIME)
160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
161 else
162 return __compat_get_timeval(tv, utv);
163}
164EXPORT_SYMBOL_GPL(compat_get_timeval);
165
166int compat_put_timeval(const struct timeval *tv, void __user *utv)
167{
168 if (COMPAT_USE_64BIT_TIME)
169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
170 else
171 return __compat_put_timeval(tv, utv);
172}
173EXPORT_SYMBOL_GPL(compat_put_timeval);
174
175int compat_get_timespec(struct timespec *ts, const void __user *uts)
176{
177 if (COMPAT_USE_64BIT_TIME)
178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
179 else
180 return __compat_get_timespec(ts, uts);
181}
182EXPORT_SYMBOL_GPL(compat_get_timespec);
183
184int compat_put_timespec(const struct timespec *ts, void __user *uts)
185{
186 if (COMPAT_USE_64BIT_TIME)
187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
188 else
189 return __compat_put_timespec(ts, uts);
190}
191EXPORT_SYMBOL_GPL(compat_put_timespec);
192
193int compat_convert_timespec(struct timespec __user **kts,
194 const void __user *cts)
195{
196 struct timespec ts;
197 struct timespec __user *uts;
198
199 if (!cts || COMPAT_USE_64BIT_TIME) {
200 *kts = (struct timespec __user *)cts;
201 return 0;
202 }
203
204 uts = compat_alloc_user_space(sizeof(ts));
205 if (!uts)
206 return -EFAULT;
207 if (compat_get_timespec(&ts, cts))
208 return -EFAULT;
209 if (copy_to_user(uts, &ts, sizeof(ts)))
210 return -EFAULT;
211
212 *kts = uts;
213 return 0;
214}
215
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
223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
224 oldfs = get_fs();
225 set_fs(KERNEL_DS);
226 ret = hrtimer_nanosleep_restart(restart);
227 set_fs(oldfs);
228
229 if (ret == -ERESTART_RESTARTBLOCK) {
230 rmtp = restart->nanosleep.compat_rmtp;
231
232 if (rmtp && compat_put_timespec(&rmt, rmtp))
233 return -EFAULT;
234 }
235
236 return ret;
237}
238
239COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
240 struct compat_timespec __user *, rmtp)
241{
242 struct timespec tu, rmt;
243 mm_segment_t oldfs;
244 long ret;
245
246 if (compat_get_timespec(&tu, rqtp))
247 return -EFAULT;
248
249 if (!timespec_valid(&tu))
250 return -EINVAL;
251
252 oldfs = get_fs();
253 set_fs(KERNEL_DS);
254 ret = hrtimer_nanosleep(&tu,
255 rmtp ? (struct timespec __user *)&rmt : NULL,
256 HRTIMER_MODE_REL, CLOCK_MONOTONIC);
257 set_fs(oldfs);
258
259 /*
260 * hrtimer_nanosleep() can only return 0 or
261 * -ERESTART_RESTARTBLOCK here because:
262 *
263 * - we call it with HRTIMER_MODE_REL and therefor exclude the
264 * -ERESTARTNOHAND return path.
265 *
266 * - we supply the rmtp argument from the task stack (due to
267 * the necessary compat conversion. So the update cannot
268 * fail, which excludes the -EFAULT return path as well. If
269 * it fails nevertheless we have a bigger problem and wont
270 * reach this place anymore.
271 *
272 * - if the return value is 0, we do not have to update rmtp
273 * because there is no remaining time.
274 *
275 * We check for -ERESTART_RESTARTBLOCK nevertheless if the
276 * core implementation decides to return random nonsense.
277 */
278 if (ret == -ERESTART_RESTARTBLOCK) {
279 struct restart_block *restart = ¤t->restart_block;
280
281 restart->fn = compat_nanosleep_restart;
282 restart->nanosleep.compat_rmtp = rmtp;
283
284 if (rmtp && compat_put_timespec(&rmt, rmtp))
285 return -EFAULT;
286 }
287 return ret;
288}
289
290static inline long get_compat_itimerval(struct itimerval *o,
291 struct compat_itimerval __user *i)
292{
293 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
294 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
295 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
296 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
297 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
298}
299
300static inline long put_compat_itimerval(struct compat_itimerval __user *o,
301 struct itimerval *i)
302{
303 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
304 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
305 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
306 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
307 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
308}
309
310asmlinkage long sys_ni_posix_timers(void);
311
312COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
313 struct compat_itimerval __user *, it)
314{
315 struct itimerval kit;
316 int error;
317
318 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
319 return sys_ni_posix_timers();
320
321 error = do_getitimer(which, &kit);
322 if (!error && put_compat_itimerval(it, &kit))
323 error = -EFAULT;
324 return error;
325}
326
327COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
328 struct compat_itimerval __user *, in,
329 struct compat_itimerval __user *, out)
330{
331 struct itimerval kin, kout;
332 int error;
333
334 if (!IS_ENABLED(CONFIG_POSIX_TIMERS))
335 return sys_ni_posix_timers();
336
337 if (in) {
338 if (get_compat_itimerval(&kin, in))
339 return -EFAULT;
340 } else
341 memset(&kin, 0, sizeof(kin));
342
343 error = do_setitimer(which, &kin, out ? &kout : NULL);
344 if (error || !out)
345 return error;
346 if (put_compat_itimerval(out, &kout))
347 return -EFAULT;
348 return 0;
349}
350
351static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
352{
353 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
354}
355
356COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
357{
358 if (tbuf) {
359 struct tms tms;
360 struct compat_tms tmp;
361
362 do_sys_times(&tms);
363 /* Convert our struct tms to the compat version. */
364 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
365 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
366 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
367 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
368 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
369 return -EFAULT;
370 }
371 force_successful_syscall_return();
372 return compat_jiffies_to_clock_t(jiffies);
373}
374
375#ifdef __ARCH_WANT_SYS_SIGPENDING
376
377/*
378 * Assumption: old_sigset_t and compat_old_sigset_t are both
379 * types that can be passed to put_user()/get_user().
380 */
381
382COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
383{
384 old_sigset_t s;
385 long ret;
386 mm_segment_t old_fs = get_fs();
387
388 set_fs(KERNEL_DS);
389 ret = sys_sigpending((old_sigset_t __user *) &s);
390 set_fs(old_fs);
391 if (ret == 0)
392 ret = put_user(s, set);
393 return ret;
394}
395
396#endif
397
398#ifdef __ARCH_WANT_SYS_SIGPROCMASK
399
400/*
401 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
402 * blocked set of signals to the supplied signal set
403 */
404static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
405{
406 memcpy(blocked->sig, &set, sizeof(set));
407}
408
409COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
410 compat_old_sigset_t __user *, nset,
411 compat_old_sigset_t __user *, oset)
412{
413 old_sigset_t old_set, new_set;
414 sigset_t new_blocked;
415
416 old_set = current->blocked.sig[0];
417
418 if (nset) {
419 if (get_user(new_set, nset))
420 return -EFAULT;
421 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
422
423 new_blocked = current->blocked;
424
425 switch (how) {
426 case SIG_BLOCK:
427 sigaddsetmask(&new_blocked, new_set);
428 break;
429 case SIG_UNBLOCK:
430 sigdelsetmask(&new_blocked, new_set);
431 break;
432 case SIG_SETMASK:
433 compat_sig_setmask(&new_blocked, new_set);
434 break;
435 default:
436 return -EINVAL;
437 }
438
439 set_current_blocked(&new_blocked);
440 }
441
442 if (oset) {
443 if (put_user(old_set, oset))
444 return -EFAULT;
445 }
446
447 return 0;
448}
449
450#endif
451
452COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
453 struct compat_rlimit __user *, rlim)
454{
455 struct rlimit r;
456
457 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
458 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
459 __get_user(r.rlim_max, &rlim->rlim_max))
460 return -EFAULT;
461
462 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
463 r.rlim_cur = RLIM_INFINITY;
464 if (r.rlim_max == COMPAT_RLIM_INFINITY)
465 r.rlim_max = RLIM_INFINITY;
466 return do_prlimit(current, resource, &r, NULL);
467}
468
469#ifdef COMPAT_RLIM_OLD_INFINITY
470
471COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
472 struct compat_rlimit __user *, rlim)
473{
474 struct rlimit r;
475 int ret;
476 mm_segment_t old_fs = get_fs();
477
478 set_fs(KERNEL_DS);
479 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
480 set_fs(old_fs);
481
482 if (!ret) {
483 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
484 r.rlim_cur = COMPAT_RLIM_INFINITY;
485 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
486 r.rlim_max = COMPAT_RLIM_INFINITY;
487
488 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
489 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
490 __put_user(r.rlim_max, &rlim->rlim_max))
491 return -EFAULT;
492 }
493 return ret;
494}
495
496#endif
497
498COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
499 struct compat_rlimit __user *, rlim)
500{
501 struct rlimit r;
502 int ret;
503
504 ret = do_prlimit(current, resource, NULL, &r);
505 if (!ret) {
506 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
507 r.rlim_cur = COMPAT_RLIM_INFINITY;
508 if (r.rlim_max > COMPAT_RLIM_INFINITY)
509 r.rlim_max = COMPAT_RLIM_INFINITY;
510
511 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
512 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
513 __put_user(r.rlim_max, &rlim->rlim_max))
514 return -EFAULT;
515 }
516 return ret;
517}
518
519int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
520{
521 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
522 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
523 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
524 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
525 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
526 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
527 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
528 __put_user(r->ru_idrss, &ru->ru_idrss) ||
529 __put_user(r->ru_isrss, &ru->ru_isrss) ||
530 __put_user(r->ru_minflt, &ru->ru_minflt) ||
531 __put_user(r->ru_majflt, &ru->ru_majflt) ||
532 __put_user(r->ru_nswap, &ru->ru_nswap) ||
533 __put_user(r->ru_inblock, &ru->ru_inblock) ||
534 __put_user(r->ru_oublock, &ru->ru_oublock) ||
535 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
536 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
537 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
538 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
539 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
540 return -EFAULT;
541 return 0;
542}
543
544COMPAT_SYSCALL_DEFINE4(wait4,
545 compat_pid_t, pid,
546 compat_uint_t __user *, stat_addr,
547 int, options,
548 struct compat_rusage __user *, ru)
549{
550 if (!ru) {
551 return sys_wait4(pid, stat_addr, options, NULL);
552 } else {
553 struct rusage r;
554 int ret;
555 unsigned int status;
556 mm_segment_t old_fs = get_fs();
557
558 set_fs (KERNEL_DS);
559 ret = sys_wait4(pid,
560 (stat_addr ?
561 (unsigned int __user *) &status : NULL),
562 options, (struct rusage __user *) &r);
563 set_fs (old_fs);
564
565 if (ret > 0) {
566 if (put_compat_rusage(&r, ru))
567 return -EFAULT;
568 if (stat_addr && put_user(status, stat_addr))
569 return -EFAULT;
570 }
571 return ret;
572 }
573}
574
575COMPAT_SYSCALL_DEFINE5(waitid,
576 int, which, compat_pid_t, pid,
577 struct compat_siginfo __user *, uinfo, int, options,
578 struct compat_rusage __user *, uru)
579{
580 siginfo_t info;
581 struct rusage ru;
582 long ret;
583 mm_segment_t old_fs = get_fs();
584
585 memset(&info, 0, sizeof(info));
586
587 set_fs(KERNEL_DS);
588 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
589 uru ? (struct rusage __user *)&ru : NULL);
590 set_fs(old_fs);
591
592 if ((ret < 0) || (info.si_signo == 0))
593 return ret;
594
595 if (uru) {
596 /* sys_waitid() overwrites everything in ru */
597 if (COMPAT_USE_64BIT_TIME)
598 ret = copy_to_user(uru, &ru, sizeof(ru));
599 else
600 ret = put_compat_rusage(&ru, uru);
601 if (ret)
602 return -EFAULT;
603 }
604
605 BUG_ON(info.si_code & __SI_MASK);
606 info.si_code |= __SI_CHLD;
607 return copy_siginfo_to_user32(uinfo, &info);
608}
609
610static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
611 unsigned len, struct cpumask *new_mask)
612{
613 unsigned long *k;
614
615 if (len < cpumask_size())
616 memset(new_mask, 0, cpumask_size());
617 else if (len > cpumask_size())
618 len = cpumask_size();
619
620 k = cpumask_bits(new_mask);
621 return compat_get_bitmap(k, user_mask_ptr, len * 8);
622}
623
624COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
625 unsigned int, len,
626 compat_ulong_t __user *, user_mask_ptr)
627{
628 cpumask_var_t new_mask;
629 int retval;
630
631 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
632 return -ENOMEM;
633
634 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
635 if (retval)
636 goto out;
637
638 retval = sched_setaffinity(pid, new_mask);
639out:
640 free_cpumask_var(new_mask);
641 return retval;
642}
643
644COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
645 compat_ulong_t __user *, user_mask_ptr)
646{
647 int ret;
648 cpumask_var_t mask;
649
650 if ((len * BITS_PER_BYTE) < nr_cpu_ids)
651 return -EINVAL;
652 if (len & (sizeof(compat_ulong_t)-1))
653 return -EINVAL;
654
655 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
656 return -ENOMEM;
657
658 ret = sched_getaffinity(pid, mask);
659 if (ret == 0) {
660 size_t retlen = min_t(size_t, len, cpumask_size());
661
662 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
663 ret = -EFAULT;
664 else
665 ret = retlen;
666 }
667 free_cpumask_var(mask);
668
669 return ret;
670}
671
672int get_compat_itimerspec(struct itimerspec *dst,
673 const struct compat_itimerspec __user *src)
674{
675 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
676 __compat_get_timespec(&dst->it_value, &src->it_value))
677 return -EFAULT;
678 return 0;
679}
680
681int put_compat_itimerspec(struct compat_itimerspec __user *dst,
682 const struct itimerspec *src)
683{
684 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
685 __compat_put_timespec(&src->it_value, &dst->it_value))
686 return -EFAULT;
687 return 0;
688}
689
690COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
691 struct compat_sigevent __user *, timer_event_spec,
692 timer_t __user *, created_timer_id)
693{
694 struct sigevent __user *event = NULL;
695
696 if (timer_event_spec) {
697 struct sigevent kevent;
698
699 event = compat_alloc_user_space(sizeof(*event));
700 if (get_compat_sigevent(&kevent, timer_event_spec) ||
701 copy_to_user(event, &kevent, sizeof(*event)))
702 return -EFAULT;
703 }
704
705 return sys_timer_create(which_clock, event, created_timer_id);
706}
707
708COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
709 struct compat_itimerspec __user *, new,
710 struct compat_itimerspec __user *, old)
711{
712 long err;
713 mm_segment_t oldfs;
714 struct itimerspec newts, oldts;
715
716 if (!new)
717 return -EINVAL;
718 if (get_compat_itimerspec(&newts, new))
719 return -EFAULT;
720 oldfs = get_fs();
721 set_fs(KERNEL_DS);
722 err = sys_timer_settime(timer_id, flags,
723 (struct itimerspec __user *) &newts,
724 (struct itimerspec __user *) &oldts);
725 set_fs(oldfs);
726 if (!err && old && put_compat_itimerspec(old, &oldts))
727 return -EFAULT;
728 return err;
729}
730
731COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
732 struct compat_itimerspec __user *, setting)
733{
734 long err;
735 mm_segment_t oldfs;
736 struct itimerspec ts;
737
738 oldfs = get_fs();
739 set_fs(KERNEL_DS);
740 err = sys_timer_gettime(timer_id,
741 (struct itimerspec __user *) &ts);
742 set_fs(oldfs);
743 if (!err && put_compat_itimerspec(setting, &ts))
744 return -EFAULT;
745 return err;
746}
747
748COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
749 struct compat_timespec __user *, tp)
750{
751 long err;
752 mm_segment_t oldfs;
753 struct timespec ts;
754
755 if (compat_get_timespec(&ts, tp))
756 return -EFAULT;
757 oldfs = get_fs();
758 set_fs(KERNEL_DS);
759 err = sys_clock_settime(which_clock,
760 (struct timespec __user *) &ts);
761 set_fs(oldfs);
762 return err;
763}
764
765COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
766 struct compat_timespec __user *, tp)
767{
768 long err;
769 mm_segment_t oldfs;
770 struct timespec ts;
771
772 oldfs = get_fs();
773 set_fs(KERNEL_DS);
774 err = sys_clock_gettime(which_clock,
775 (struct timespec __user *) &ts);
776 set_fs(oldfs);
777 if (!err && compat_put_timespec(&ts, tp))
778 return -EFAULT;
779 return err;
780}
781
782COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
783 struct compat_timex __user *, utp)
784{
785 struct timex txc;
786 mm_segment_t oldfs;
787 int err, ret;
788
789 err = compat_get_timex(&txc, utp);
790 if (err)
791 return err;
792
793 oldfs = get_fs();
794 set_fs(KERNEL_DS);
795 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
796 set_fs(oldfs);
797
798 err = compat_put_timex(utp, &txc);
799 if (err)
800 return err;
801
802 return ret;
803}
804
805COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
806 struct compat_timespec __user *, tp)
807{
808 long err;
809 mm_segment_t oldfs;
810 struct timespec ts;
811
812 oldfs = get_fs();
813 set_fs(KERNEL_DS);
814 err = sys_clock_getres(which_clock,
815 (struct timespec __user *) &ts);
816 set_fs(oldfs);
817 if (!err && tp && compat_put_timespec(&ts, tp))
818 return -EFAULT;
819 return err;
820}
821
822static long compat_clock_nanosleep_restart(struct restart_block *restart)
823{
824 long err;
825 mm_segment_t oldfs;
826 struct timespec tu;
827 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
828
829 restart->nanosleep.rmtp = (struct timespec __user *) &tu;
830 oldfs = get_fs();
831 set_fs(KERNEL_DS);
832 err = clock_nanosleep_restart(restart);
833 set_fs(oldfs);
834
835 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
836 compat_put_timespec(&tu, rmtp))
837 return -EFAULT;
838
839 if (err == -ERESTART_RESTARTBLOCK) {
840 restart->fn = compat_clock_nanosleep_restart;
841 restart->nanosleep.compat_rmtp = rmtp;
842 }
843 return err;
844}
845
846COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
847 struct compat_timespec __user *, rqtp,
848 struct compat_timespec __user *, rmtp)
849{
850 long err;
851 mm_segment_t oldfs;
852 struct timespec in, out;
853 struct restart_block *restart;
854
855 if (compat_get_timespec(&in, rqtp))
856 return -EFAULT;
857
858 oldfs = get_fs();
859 set_fs(KERNEL_DS);
860 err = sys_clock_nanosleep(which_clock, flags,
861 (struct timespec __user *) &in,
862 (struct timespec __user *) &out);
863 set_fs(oldfs);
864
865 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
866 compat_put_timespec(&out, rmtp))
867 return -EFAULT;
868
869 if (err == -ERESTART_RESTARTBLOCK) {
870 restart = ¤t->restart_block;
871 restart->fn = compat_clock_nanosleep_restart;
872 restart->nanosleep.compat_rmtp = rmtp;
873 }
874 return err;
875}
876
877/*
878 * We currently only need the following fields from the sigevent
879 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
880 * sigev_notify_thread_id). The others are handled in user mode.
881 * We also assume that copying sigev_value.sival_int is sufficient
882 * to keep all the bits of sigev_value.sival_ptr intact.
883 */
884int get_compat_sigevent(struct sigevent *event,
885 const struct compat_sigevent __user *u_event)
886{
887 memset(event, 0, sizeof(*event));
888 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
889 __get_user(event->sigev_value.sival_int,
890 &u_event->sigev_value.sival_int) ||
891 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
892 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
893 __get_user(event->sigev_notify_thread_id,
894 &u_event->sigev_notify_thread_id))
895 ? -EFAULT : 0;
896}
897
898long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
899 unsigned long bitmap_size)
900{
901 int i, j;
902 unsigned long m;
903 compat_ulong_t um;
904 unsigned long nr_compat_longs;
905
906 /* align bitmap up to nearest compat_long_t boundary */
907 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
908
909 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
910 return -EFAULT;
911
912 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
913
914 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
915 m = 0;
916
917 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
918 /*
919 * We dont want to read past the end of the userspace
920 * bitmap. We must however ensure the end of the
921 * kernel bitmap is zeroed.
922 */
923 if (nr_compat_longs) {
924 nr_compat_longs--;
925 if (__get_user(um, umask))
926 return -EFAULT;
927 } else {
928 um = 0;
929 }
930
931 umask++;
932 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
933 }
934 *mask++ = m;
935 }
936
937 return 0;
938}
939
940long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
941 unsigned long bitmap_size)
942{
943 int i, j;
944 unsigned long m;
945 compat_ulong_t um;
946 unsigned long nr_compat_longs;
947
948 /* align bitmap up to nearest compat_long_t boundary */
949 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
950
951 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
952 return -EFAULT;
953
954 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
955
956 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
957 m = *mask++;
958
959 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
960 um = m;
961
962 /*
963 * We dont want to write past the end of the userspace
964 * bitmap.
965 */
966 if (nr_compat_longs) {
967 nr_compat_longs--;
968 if (__put_user(um, umask))
969 return -EFAULT;
970 }
971
972 umask++;
973 m >>= 4*sizeof(um);
974 m >>= 4*sizeof(um);
975 }
976 }
977
978 return 0;
979}
980
981void
982sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
983{
984 switch (_NSIG_WORDS) {
985 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
986 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
987 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
988 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
989 }
990}
991EXPORT_SYMBOL_GPL(sigset_from_compat);
992
993void
994sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
995{
996 switch (_NSIG_WORDS) {
997 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
998 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
999 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
1000 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
1001 }
1002}
1003
1004COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
1005 struct compat_siginfo __user *, uinfo,
1006 struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
1007{
1008 compat_sigset_t s32;
1009 sigset_t s;
1010 struct timespec t;
1011 siginfo_t info;
1012 long ret;
1013
1014 if (sigsetsize != sizeof(sigset_t))
1015 return -EINVAL;
1016
1017 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
1018 return -EFAULT;
1019 sigset_from_compat(&s, &s32);
1020
1021 if (uts) {
1022 if (compat_get_timespec(&t, uts))
1023 return -EFAULT;
1024 }
1025
1026 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
1027
1028 if (ret > 0 && uinfo) {
1029 if (copy_siginfo_to_user32(uinfo, &info))
1030 ret = -EFAULT;
1031 }
1032
1033 return ret;
1034}
1035
1036#ifdef __ARCH_WANT_COMPAT_SYS_TIME
1037
1038/* compat_time_t is a 32 bit "long" and needs to get converted. */
1039
1040COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
1041{
1042 compat_time_t i;
1043 struct timeval tv;
1044
1045 do_gettimeofday(&tv);
1046 i = tv.tv_sec;
1047
1048 if (tloc) {
1049 if (put_user(i,tloc))
1050 return -EFAULT;
1051 }
1052 force_successful_syscall_return();
1053 return i;
1054}
1055
1056COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
1057{
1058 struct timespec tv;
1059 int err;
1060
1061 if (get_user(tv.tv_sec, tptr))
1062 return -EFAULT;
1063
1064 tv.tv_nsec = 0;
1065
1066 err = security_settime(&tv, NULL);
1067 if (err)
1068 return err;
1069
1070 do_settimeofday(&tv);
1071 return 0;
1072}
1073
1074#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1075
1076COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
1077{
1078 struct timex txc;
1079 int err, ret;
1080
1081 err = compat_get_timex(&txc, utp);
1082 if (err)
1083 return err;
1084
1085 ret = do_adjtimex(&txc);
1086
1087 err = compat_put_timex(utp, &txc);
1088 if (err)
1089 return err;
1090
1091 return ret;
1092}
1093
1094#ifdef CONFIG_NUMA
1095COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
1096 compat_uptr_t __user *, pages32,
1097 const int __user *, nodes,
1098 int __user *, status,
1099 int, flags)
1100{
1101 const void __user * __user *pages;
1102 int i;
1103
1104 pages = compat_alloc_user_space(nr_pages * sizeof(void *));
1105 for (i = 0; i < nr_pages; i++) {
1106 compat_uptr_t p;
1107
1108 if (get_user(p, pages32 + i) ||
1109 put_user(compat_ptr(p), pages + i))
1110 return -EFAULT;
1111 }
1112 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
1113}
1114
1115COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
1116 compat_ulong_t, maxnode,
1117 const compat_ulong_t __user *, old_nodes,
1118 const compat_ulong_t __user *, new_nodes)
1119{
1120 unsigned long __user *old = NULL;
1121 unsigned long __user *new = NULL;
1122 nodemask_t tmp_mask;
1123 unsigned long nr_bits;
1124 unsigned long size;
1125
1126 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
1127 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
1128 if (old_nodes) {
1129 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1130 return -EFAULT;
1131 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1132 if (new_nodes)
1133 new = old + size / sizeof(unsigned long);
1134 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1135 return -EFAULT;
1136 }
1137 if (new_nodes) {
1138 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1139 return -EFAULT;
1140 if (new == NULL)
1141 new = compat_alloc_user_space(size);
1142 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1143 return -EFAULT;
1144 }
1145 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1146}
1147#endif
1148
1149COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
1150 compat_pid_t, pid,
1151 struct compat_timespec __user *, interval)
1152{
1153 struct timespec t;
1154 int ret;
1155 mm_segment_t old_fs = get_fs();
1156
1157 set_fs(KERNEL_DS);
1158 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
1159 set_fs(old_fs);
1160 if (compat_put_timespec(&t, interval))
1161 return -EFAULT;
1162 return ret;
1163}
1164
1165/*
1166 * Allocate user-space memory for the duration of a single system call,
1167 * in order to marshall parameters inside a compat thunk.
1168 */
1169void __user *compat_alloc_user_space(unsigned long len)
1170{
1171 void __user *ptr;
1172
1173 /* If len would occupy more than half of the entire compat space... */
1174 if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
1175 return NULL;
1176
1177 ptr = arch_compat_alloc_user_space(len);
1178
1179 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
1180 return NULL;
1181
1182 return ptr;
1183}
1184EXPORT_SYMBOL_GPL(compat_alloc_user_space);