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30#include <linux/export.h>
31#include <linux/kernel.h>
32#include <linux/timex.h>
33#include <linux/capability.h>
34#include <linux/timekeeper_internal.h>
35#include <linux/errno.h>
36#include <linux/syscalls.h>
37#include <linux/security.h>
38#include <linux/fs.h>
39#include <linux/math64.h>
40#include <linux/ptrace.h>
41
42#include <linux/uaccess.h>
43#include <linux/compat.h>
44#include <asm/unistd.h>
45
46#include <generated/timeconst.h>
47#include "timekeeping.h"
48
49
50
51
52
53struct timezone sys_tz;
54
55EXPORT_SYMBOL(sys_tz);
56
57#ifdef __ARCH_WANT_SYS_TIME
58
59
60
61
62
63
64
65SYSCALL_DEFINE1(time, time_t __user *, tloc)
66{
67 time_t i = get_seconds();
68
69 if (tloc) {
70 if (put_user(i,tloc))
71 return -EFAULT;
72 }
73 force_successful_syscall_return();
74 return i;
75}
76
77
78
79
80
81
82
83
84SYSCALL_DEFINE1(stime, time_t __user *, tptr)
85{
86 struct timespec64 tv;
87 int err;
88
89 if (get_user(tv.tv_sec, tptr))
90 return -EFAULT;
91
92 tv.tv_nsec = 0;
93
94 err = security_settime64(&tv, NULL);
95 if (err)
96 return err;
97
98 do_settimeofday64(&tv);
99 return 0;
100}
101
102#endif
103
104#ifdef CONFIG_COMPAT
105#ifdef __ARCH_WANT_COMPAT_SYS_TIME
106
107
108COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
109{
110 struct timeval tv;
111 compat_time_t i;
112
113 do_gettimeofday(&tv);
114 i = tv.tv_sec;
115
116 if (tloc) {
117 if (put_user(i,tloc))
118 return -EFAULT;
119 }
120 force_successful_syscall_return();
121 return i;
122}
123
124COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
125{
126 struct timespec64 tv;
127 int err;
128
129 if (get_user(tv.tv_sec, tptr))
130 return -EFAULT;
131
132 tv.tv_nsec = 0;
133
134 err = security_settime64(&tv, NULL);
135 if (err)
136 return err;
137
138 do_settimeofday64(&tv);
139 return 0;
140}
141
142#endif
143#endif
144
145SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv,
146 struct timezone __user *, tz)
147{
148 if (likely(tv != NULL)) {
149 struct timeval ktv;
150 do_gettimeofday(&ktv);
151 if (copy_to_user(tv, &ktv, sizeof(ktv)))
152 return -EFAULT;
153 }
154 if (unlikely(tz != NULL)) {
155 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
156 return -EFAULT;
157 }
158 return 0;
159}
160
161
162
163
164
165
166
167
168
169
170
171
172int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz)
173{
174 static int firsttime = 1;
175 int error = 0;
176
177 if (tv && !timespec64_valid(tv))
178 return -EINVAL;
179
180 error = security_settime64(tv, tz);
181 if (error)
182 return error;
183
184 if (tz) {
185
186 if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
187 return -EINVAL;
188
189 sys_tz = *tz;
190 update_vsyscall_tz();
191 if (firsttime) {
192 firsttime = 0;
193 if (!tv)
194 timekeeping_warp_clock();
195 }
196 }
197 if (tv)
198 return do_settimeofday64(tv);
199 return 0;
200}
201
202SYSCALL_DEFINE2(settimeofday, struct timeval __user *, tv,
203 struct timezone __user *, tz)
204{
205 struct timespec64 new_ts;
206 struct timeval user_tv;
207 struct timezone new_tz;
208
209 if (tv) {
210 if (copy_from_user(&user_tv, tv, sizeof(*tv)))
211 return -EFAULT;
212
213 if (!timeval_valid(&user_tv))
214 return -EINVAL;
215
216 new_ts.tv_sec = user_tv.tv_sec;
217 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
218 }
219 if (tz) {
220 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
221 return -EFAULT;
222 }
223
224 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
225}
226
227#ifdef CONFIG_COMPAT
228COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
229 struct timezone __user *, tz)
230{
231 if (tv) {
232 struct timeval ktv;
233
234 do_gettimeofday(&ktv);
235 if (compat_put_timeval(&ktv, tv))
236 return -EFAULT;
237 }
238 if (tz) {
239 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
240 return -EFAULT;
241 }
242
243 return 0;
244}
245
246COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
247 struct timezone __user *, tz)
248{
249 struct timespec64 new_ts;
250 struct timeval user_tv;
251 struct timezone new_tz;
252
253 if (tv) {
254 if (compat_get_timeval(&user_tv, tv))
255 return -EFAULT;
256 new_ts.tv_sec = user_tv.tv_sec;
257 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
258 }
259 if (tz) {
260 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
261 return -EFAULT;
262 }
263
264 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
265}
266#endif
267
268SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p)
269{
270 struct timex txc;
271 int ret;
272
273
274
275
276
277 if (copy_from_user(&txc, txc_p, sizeof(struct timex)))
278 return -EFAULT;
279 ret = do_adjtimex(&txc);
280 return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
281}
282
283#ifdef CONFIG_COMPAT
284
285COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
286{
287 struct timex txc;
288 int err, ret;
289
290 err = compat_get_timex(&txc, utp);
291 if (err)
292 return err;
293
294 ret = do_adjtimex(&txc);
295
296 err = compat_put_timex(utp, &txc);
297 if (err)
298 return err;
299
300 return ret;
301}
302#endif
303
304
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306
307
308
309
310unsigned int jiffies_to_msecs(const unsigned long j)
311{
312#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
313 return (MSEC_PER_SEC / HZ) * j;
314#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
315 return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
316#else
317# if BITS_PER_LONG == 32
318 return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
319 HZ_TO_MSEC_SHR32;
320# else
321 return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
322# endif
323#endif
324}
325EXPORT_SYMBOL(jiffies_to_msecs);
326
327unsigned int jiffies_to_usecs(const unsigned long j)
328{
329
330
331
332
333 BUILD_BUG_ON(HZ > USEC_PER_SEC);
334
335#if !(USEC_PER_SEC % HZ)
336 return (USEC_PER_SEC / HZ) * j;
337#else
338# if BITS_PER_LONG == 32
339 return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
340# else
341 return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
342# endif
343#endif
344}
345EXPORT_SYMBOL(jiffies_to_usecs);
346
347
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352
353
354
355struct timespec timespec_trunc(struct timespec t, unsigned gran)
356{
357
358 if (gran == 1) {
359
360 } else if (gran == NSEC_PER_SEC) {
361 t.tv_nsec = 0;
362 } else if (gran > 1 && gran < NSEC_PER_SEC) {
363 t.tv_nsec -= t.tv_nsec % gran;
364 } else {
365 WARN(1, "illegal file time granularity: %u", gran);
366 }
367 return t;
368}
369EXPORT_SYMBOL(timespec_trunc);
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391time64_t mktime64(const unsigned int year0, const unsigned int mon0,
392 const unsigned int day, const unsigned int hour,
393 const unsigned int min, const unsigned int sec)
394{
395 unsigned int mon = mon0, year = year0;
396
397
398 if (0 >= (int) (mon -= 2)) {
399 mon += 12;
400 year -= 1;
401 }
402
403 return ((((time64_t)
404 (year/4 - year/100 + year/400 + 367*mon/12 + day) +
405 year*365 - 719499
406 )*24 + hour
407 )*60 + min
408 )*60 + sec;
409}
410EXPORT_SYMBOL(mktime64);
411
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425
426void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec)
427{
428 while (nsec >= NSEC_PER_SEC) {
429
430
431
432
433
434 asm("" : "+rm"(nsec));
435 nsec -= NSEC_PER_SEC;
436 ++sec;
437 }
438 while (nsec < 0) {
439 asm("" : "+rm"(nsec));
440 nsec += NSEC_PER_SEC;
441 --sec;
442 }
443 ts->tv_sec = sec;
444 ts->tv_nsec = nsec;
445}
446EXPORT_SYMBOL(set_normalized_timespec);
447
448
449
450
451
452
453
454struct timespec ns_to_timespec(const s64 nsec)
455{
456 struct timespec ts;
457 s32 rem;
458
459 if (!nsec)
460 return (struct timespec) {0, 0};
461
462 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
463 if (unlikely(rem < 0)) {
464 ts.tv_sec--;
465 rem += NSEC_PER_SEC;
466 }
467 ts.tv_nsec = rem;
468
469 return ts;
470}
471EXPORT_SYMBOL(ns_to_timespec);
472
473
474
475
476
477
478
479struct timeval ns_to_timeval(const s64 nsec)
480{
481 struct timespec ts = ns_to_timespec(nsec);
482 struct timeval tv;
483
484 tv.tv_sec = ts.tv_sec;
485 tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
486
487 return tv;
488}
489EXPORT_SYMBOL(ns_to_timeval);
490
491struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
492{
493 struct timespec64 ts = ns_to_timespec64(nsec);
494 struct __kernel_old_timeval tv;
495
496 tv.tv_sec = ts.tv_sec;
497 tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
498
499 return tv;
500}
501EXPORT_SYMBOL(ns_to_kernel_old_timeval);
502
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516
517void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
518{
519 while (nsec >= NSEC_PER_SEC) {
520
521
522
523
524
525 asm("" : "+rm"(nsec));
526 nsec -= NSEC_PER_SEC;
527 ++sec;
528 }
529 while (nsec < 0) {
530 asm("" : "+rm"(nsec));
531 nsec += NSEC_PER_SEC;
532 --sec;
533 }
534 ts->tv_sec = sec;
535 ts->tv_nsec = nsec;
536}
537EXPORT_SYMBOL(set_normalized_timespec64);
538
539
540
541
542
543
544
545struct timespec64 ns_to_timespec64(const s64 nsec)
546{
547 struct timespec64 ts;
548 s32 rem;
549
550 if (!nsec)
551 return (struct timespec64) {0, 0};
552
553 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
554 if (unlikely(rem < 0)) {
555 ts.tv_sec--;
556 rem += NSEC_PER_SEC;
557 }
558 ts.tv_nsec = rem;
559
560 return ts;
561}
562EXPORT_SYMBOL(ns_to_timespec64);
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588unsigned long __msecs_to_jiffies(const unsigned int m)
589{
590
591
592
593 if ((int)m < 0)
594 return MAX_JIFFY_OFFSET;
595 return _msecs_to_jiffies(m);
596}
597EXPORT_SYMBOL(__msecs_to_jiffies);
598
599unsigned long __usecs_to_jiffies(const unsigned int u)
600{
601 if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
602 return MAX_JIFFY_OFFSET;
603 return _usecs_to_jiffies(u);
604}
605EXPORT_SYMBOL(__usecs_to_jiffies);
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621
622static unsigned long
623__timespec64_to_jiffies(u64 sec, long nsec)
624{
625 nsec = nsec + TICK_NSEC - 1;
626
627 if (sec >= MAX_SEC_IN_JIFFIES){
628 sec = MAX_SEC_IN_JIFFIES;
629 nsec = 0;
630 }
631 return ((sec * SEC_CONVERSION) +
632 (((u64)nsec * NSEC_CONVERSION) >>
633 (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
634
635}
636
637static unsigned long
638__timespec_to_jiffies(unsigned long sec, long nsec)
639{
640 return __timespec64_to_jiffies((u64)sec, nsec);
641}
642
643unsigned long
644timespec64_to_jiffies(const struct timespec64 *value)
645{
646 return __timespec64_to_jiffies(value->tv_sec, value->tv_nsec);
647}
648EXPORT_SYMBOL(timespec64_to_jiffies);
649
650void
651jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
652{
653
654
655
656
657 u32 rem;
658 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
659 NSEC_PER_SEC, &rem);
660 value->tv_nsec = rem;
661}
662EXPORT_SYMBOL(jiffies_to_timespec64);
663
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679
680unsigned long
681timeval_to_jiffies(const struct timeval *value)
682{
683 return __timespec_to_jiffies(value->tv_sec,
684 value->tv_usec * NSEC_PER_USEC);
685}
686EXPORT_SYMBOL(timeval_to_jiffies);
687
688void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
689{
690
691
692
693
694 u32 rem;
695
696 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
697 NSEC_PER_SEC, &rem);
698 value->tv_usec = rem / NSEC_PER_USEC;
699}
700EXPORT_SYMBOL(jiffies_to_timeval);
701
702
703
704
705clock_t jiffies_to_clock_t(unsigned long x)
706{
707#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
708# if HZ < USER_HZ
709 return x * (USER_HZ / HZ);
710# else
711 return x / (HZ / USER_HZ);
712# endif
713#else
714 return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
715#endif
716}
717EXPORT_SYMBOL(jiffies_to_clock_t);
718
719unsigned long clock_t_to_jiffies(unsigned long x)
720{
721#if (HZ % USER_HZ)==0
722 if (x >= ~0UL / (HZ / USER_HZ))
723 return ~0UL;
724 return x * (HZ / USER_HZ);
725#else
726
727 if (x >= ~0UL / HZ * USER_HZ)
728 return ~0UL;
729
730
731 return div_u64((u64)x * HZ, USER_HZ);
732#endif
733}
734EXPORT_SYMBOL(clock_t_to_jiffies);
735
736u64 jiffies_64_to_clock_t(u64 x)
737{
738#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
739# if HZ < USER_HZ
740 x = div_u64(x * USER_HZ, HZ);
741# elif HZ > USER_HZ
742 x = div_u64(x, HZ / USER_HZ);
743# else
744
745# endif
746#else
747
748
749
750
751
752 x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ));
753#endif
754 return x;
755}
756EXPORT_SYMBOL(jiffies_64_to_clock_t);
757
758u64 nsec_to_clock_t(u64 x)
759{
760#if (NSEC_PER_SEC % USER_HZ) == 0
761 return div_u64(x, NSEC_PER_SEC / USER_HZ);
762#elif (USER_HZ % 512) == 0
763 return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512);
764#else
765
766
767
768
769
770 return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ);
771#endif
772}
773
774u64 jiffies64_to_nsecs(u64 j)
775{
776#if !(NSEC_PER_SEC % HZ)
777 return (NSEC_PER_SEC / HZ) * j;
778# else
779 return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN);
780#endif
781}
782EXPORT_SYMBOL(jiffies64_to_nsecs);
783
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796
797u64 nsecs_to_jiffies64(u64 n)
798{
799#if (NSEC_PER_SEC % HZ) == 0
800
801 return div_u64(n, NSEC_PER_SEC / HZ);
802#elif (HZ % 512) == 0
803
804 return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
805#else
806
807
808
809
810 return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
811#endif
812}
813EXPORT_SYMBOL(nsecs_to_jiffies64);
814
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827
828unsigned long nsecs_to_jiffies(u64 n)
829{
830 return (unsigned long)nsecs_to_jiffies64(n);
831}
832EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
833
834
835
836
837
838
839struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
840 const struct timespec64 rhs)
841{
842 struct timespec64 res;
843
844 set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
845 lhs.tv_nsec + rhs.tv_nsec);
846
847 if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
848 res.tv_sec = TIME64_MAX;
849 res.tv_nsec = 0;
850 }
851
852 return res;
853}
854
855int get_timespec64(struct timespec64 *ts,
856 const struct __kernel_timespec __user *uts)
857{
858 struct __kernel_timespec kts;
859 int ret;
860
861 ret = copy_from_user(&kts, uts, sizeof(kts));
862 if (ret)
863 return -EFAULT;
864
865 ts->tv_sec = kts.tv_sec;
866
867
868 if (IS_ENABLED(CONFIG_64BIT_TIME) && (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()))
869 kts.tv_nsec &= 0xFFFFFFFFUL;
870
871 ts->tv_nsec = kts.tv_nsec;
872
873 return 0;
874}
875EXPORT_SYMBOL_GPL(get_timespec64);
876
877int put_timespec64(const struct timespec64 *ts,
878 struct __kernel_timespec __user *uts)
879{
880 struct __kernel_timespec kts = {
881 .tv_sec = ts->tv_sec,
882 .tv_nsec = ts->tv_nsec
883 };
884
885 return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
886}
887EXPORT_SYMBOL_GPL(put_timespec64);
888
889int __compat_get_timespec64(struct timespec64 *ts64,
890 const struct compat_timespec __user *cts)
891{
892 struct compat_timespec ts;
893 int ret;
894
895 ret = copy_from_user(&ts, cts, sizeof(ts));
896 if (ret)
897 return -EFAULT;
898
899 ts64->tv_sec = ts.tv_sec;
900 ts64->tv_nsec = ts.tv_nsec;
901
902 return 0;
903}
904
905int __compat_put_timespec64(const struct timespec64 *ts64,
906 struct compat_timespec __user *cts)
907{
908 struct compat_timespec ts = {
909 .tv_sec = ts64->tv_sec,
910 .tv_nsec = ts64->tv_nsec
911 };
912 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
913}
914
915int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
916{
917 if (COMPAT_USE_64BIT_TIME)
918 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
919 else
920 return __compat_get_timespec64(ts, uts);
921}
922EXPORT_SYMBOL_GPL(compat_get_timespec64);
923
924int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
925{
926 if (COMPAT_USE_64BIT_TIME)
927 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
928 else
929 return __compat_put_timespec64(ts, uts);
930}
931EXPORT_SYMBOL_GPL(compat_put_timespec64);
932
933int get_itimerspec64(struct itimerspec64 *it,
934 const struct itimerspec __user *uit)
935{
936 int ret;
937
938 ret = get_timespec64(&it->it_interval, &uit->it_interval);
939 if (ret)
940 return ret;
941
942 ret = get_timespec64(&it->it_value, &uit->it_value);
943
944 return ret;
945}
946EXPORT_SYMBOL_GPL(get_itimerspec64);
947
948int put_itimerspec64(const struct itimerspec64 *it,
949 struct itimerspec __user *uit)
950{
951 int ret;
952
953 ret = put_timespec64(&it->it_interval, &uit->it_interval);
954 if (ret)
955 return ret;
956
957 ret = put_timespec64(&it->it_value, &uit->it_value);
958
959 return ret;
960}
961EXPORT_SYMBOL_GPL(put_itimerspec64);
962