78274dc8ce
Bug 22639 reports localtime failing to handle time offset transitions
correctly in 2039 and later on platforms with 64-bit time_t.
The problem is the use of SECSPERDAY (constant 86400) in calculations
such as
t = ((year - 1970) * 365
+ /* Compute the number of leapdays between 1970 and YEAR
(exclusive). There is a leapday every 4th year ... */
+ ((year - 1) / 4 - 1970 / 4)
/* ... except every 100th year ... */
- ((year - 1) / 100 - 1970 / 100)
/* ... but still every 400th year. */
+ ((year - 1) / 400 - 1970 / 400)) * SECSPERDAY;
where t is of type time_t and year is of type int. Before my commit
92bd70fb85 (an update from tzcode,
included in 2.26 and later releases), SECSPERDAY was obtained from a
file imported from tzcode, where the value included a cast to
int_fast32_t. On 64-bit platforms, glibc defines int_fast32_t to be
long int, so 64-bit, but my patch resulted in it changing to int.
(The bug would probably have existed even before my patch for x32,
which has 64-bit time_t but 32-bit int_fast32_t, but I haven't
verified that.)
This patch fixes the problem by including a cast to time_t in the
definition of SECSPERDAY. (64-bit time support for 32-bit systems
should move such code that isn't a public interface to using the
internal 64-bit version of time_t throughout.)
Tested for x86_64 and x86.
[BZ #22639]
* time/tzset.c (SECSPERDAY): Cast to time_t.
* time/tst-y2039.c: New file.
* time/Makefile (tests): Add tst-y2039.
632 lines
16 KiB
C
632 lines
16 KiB
C
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.h>
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#include <libc-lock.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <timezone/tzfile.h>
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#define SECSPERDAY ((time_t) 86400)
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char *__tzname[2] = { (char *) "GMT", (char *) "GMT" };
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int __daylight = 0;
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long int __timezone = 0L;
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weak_alias (__tzname, tzname)
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weak_alias (__daylight, daylight)
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weak_alias (__timezone, timezone)
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/* This locks all the state variables in tzfile.c and this file. */
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__libc_lock_define_initialized (static, tzset_lock)
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/* This structure contains all the information about a
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timezone given in the POSIX standard TZ envariable. */
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typedef struct
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{
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const char *name;
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/* When to change. */
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enum { J0, J1, M } type; /* Interpretation of: */
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unsigned short int m, n, d; /* Month, week, day. */
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int secs; /* Time of day. */
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long int offset; /* Seconds east of GMT (west if < 0). */
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/* We cache the computed time of change for a
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given year so we don't have to recompute it. */
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time_t change; /* When to change to this zone. */
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int computed_for; /* Year above is computed for. */
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} tz_rule;
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/* tz_rules[0] is standard, tz_rules[1] is daylight. */
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static tz_rule tz_rules[2];
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static void compute_change (tz_rule *rule, int year) __THROW;
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static void tzset_internal (int always);
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/* List of buffers containing time zone strings. */
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struct tzstring_l
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{
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struct tzstring_l *next;
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size_t len; /* strlen(data) - doesn't count terminating NUL! */
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char data[0];
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};
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static struct tzstring_l *tzstring_list;
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/* Allocate a permanent home for the first LEN characters of S. It
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will never be moved or deallocated, but may share space with other
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strings. Don't modify the returned string. */
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static char *
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__tzstring_len (const char *s, size_t len)
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{
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char *p;
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struct tzstring_l *t, *u, *new;
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/* Walk the list and look for a match. If this string is the same
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as the end of an already-allocated string, it can share space. */
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for (u = t = tzstring_list; t; u = t, t = t->next)
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if (len <= t->len)
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{
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p = &t->data[t->len - len];
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if (memcmp (s, p, len) == 0)
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return p;
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}
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/* Not found; allocate a new buffer. */
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new = malloc (sizeof (struct tzstring_l) + len + 1);
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if (!new)
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return NULL;
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new->next = NULL;
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new->len = len;
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memcpy (new->data, s, len);
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new->data[len] = '\0';
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if (u)
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u->next = new;
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else
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tzstring_list = new;
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return new->data;
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}
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/* Allocate a permanent home for S. It will never be moved or
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deallocated, but may share space with other strings. Don't modify
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the returned string. */
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char *
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__tzstring (const char *s)
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{
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return __tzstring_len (s, strlen (s));
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}
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static char *old_tz;
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static void
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update_vars (void)
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{
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__daylight = tz_rules[0].offset != tz_rules[1].offset;
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__timezone = -tz_rules[0].offset;
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__tzname[0] = (char *) tz_rules[0].name;
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__tzname[1] = (char *) tz_rules[1].name;
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}
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static unsigned int
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compute_offset (unsigned int ss, unsigned int mm, unsigned int hh)
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{
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if (ss > 59)
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ss = 59;
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if (mm > 59)
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mm = 59;
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if (hh > 24)
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hh = 24;
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return ss + mm * 60 + hh * 60 * 60;
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}
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/* Parses the time zone name at *TZP, and writes a pointer to an
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interned string to tz_rules[WHICHRULE].name. On success, advances
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*TZP, and returns true. Returns false otherwise. */
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static bool
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parse_tzname (const char **tzp, int whichrule)
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{
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const char *start = *tzp;
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const char *p = start;
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while (('a' <= *p && *p <= 'z')
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|| ('A' <= *p && *p <= 'Z'))
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++p;
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size_t len = p - start;
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if (len < 3)
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{
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p = *tzp;
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if (__glibc_unlikely (*p++ != '<'))
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return false;
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start = p;
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while (('a' <= *p && *p <= 'z')
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|| ('A' <= *p && *p <= 'Z')
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|| ('0' <= *p && *p <= '9')
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|| *p == '+' || *p == '-')
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++p;
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len = p - start;
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if (*p++ != '>' || len < 3)
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return false;
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}
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const char *name = __tzstring_len (start, len);
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if (name == NULL)
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return false;
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tz_rules[whichrule].name = name;
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*tzp = p;
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return true;
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}
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/* Parses the time zone offset at *TZP, and writes it to
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tz_rules[WHICHRULE].offset. Returns true if the parse was
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successful. */
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static bool
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parse_offset (const char **tzp, int whichrule)
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{
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const char *tz = *tzp;
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if (whichrule == 0
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&& (*tz == '\0' || (*tz != '+' && *tz != '-' && !isdigit (*tz))))
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return false;
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long sign;
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if (*tz == '-' || *tz == '+')
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sign = *tz++ == '-' ? 1L : -1L;
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else
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sign = -1L;
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*tzp = tz;
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unsigned short int hh;
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unsigned short mm = 0;
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unsigned short ss = 0;
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int consumed = 0;
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if (sscanf (tz, "%hu%n:%hu%n:%hu%n",
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&hh, &consumed, &mm, &consumed, &ss, &consumed) > 0)
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tz_rules[whichrule].offset = sign * compute_offset (ss, mm, hh);
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else
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/* Nothing could be parsed. */
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if (whichrule == 0)
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{
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/* Standard time defaults to offset zero. */
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tz_rules[0].offset = 0;
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return false;
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}
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else
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/* DST defaults to one hour later than standard time. */
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tz_rules[1].offset = tz_rules[0].offset + (60 * 60);
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*tzp = tz + consumed;
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return true;
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}
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/* Parses the standard <-> DST rules at *TZP. Updates
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tz_rule[WHICHRULE]. On success, advances *TZP and returns true.
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Otherwise, returns false. */
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static bool
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parse_rule (const char **tzp, int whichrule)
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{
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const char *tz = *tzp;
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tz_rule *tzr = &tz_rules[whichrule];
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/* Ignore comma to support string following the incorrect
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specification in early POSIX.1 printings. */
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tz += *tz == ',';
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/* Get the date of the change. */
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if (*tz == 'J' || isdigit (*tz))
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{
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char *end;
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tzr->type = *tz == 'J' ? J1 : J0;
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if (tzr->type == J1 && !isdigit (*++tz))
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return false;
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unsigned long int d = strtoul (tz, &end, 10);
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if (end == tz || d > 365)
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return false;
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if (tzr->type == J1 && d == 0)
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return false;
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tzr->d = d;
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tz = end;
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}
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else if (*tz == 'M')
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{
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tzr->type = M;
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int consumed;
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if (sscanf (tz, "M%hu.%hu.%hu%n",
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&tzr->m, &tzr->n, &tzr->d, &consumed) != 3
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|| tzr->m < 1 || tzr->m > 12
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|| tzr->n < 1 || tzr->n > 5 || tzr->d > 6)
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return false;
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tz += consumed;
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}
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else if (*tz == '\0')
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{
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/* Daylight time rules in the U.S. are defined in the U.S. Code,
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Title 15, Chapter 6, Subchapter IX - Standard Time. These
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dates were established by Congress in the Energy Policy Act
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of 2005 [Pub. L. no. 109-58, 119 Stat 594 (2005)].
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Below is the equivalent of "M3.2.0,M11.1.0" [/2 not needed
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since 2:00AM is the default]. */
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tzr->type = M;
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if (tzr == &tz_rules[0])
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{
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tzr->m = 3;
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tzr->n = 2;
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tzr->d = 0;
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}
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else
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{
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tzr->m = 11;
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tzr->n = 1;
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tzr->d = 0;
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}
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}
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else
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return false;
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if (*tz != '\0' && *tz != '/' && *tz != ',')
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return false;
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else if (*tz == '/')
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{
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/* Get the time of day of the change. */
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int negative;
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++tz;
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if (*tz == '\0')
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return false;
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negative = *tz == '-';
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tz += negative;
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/* Default to 2:00 AM. */
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unsigned short hh = 2;
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unsigned short mm = 0;
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unsigned short ss = 0;
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int consumed = 0;
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sscanf (tz, "%hu%n:%hu%n:%hu%n",
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&hh, &consumed, &mm, &consumed, &ss, &consumed);;
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tz += consumed;
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tzr->secs = (negative ? -1 : 1) * ((hh * 60 * 60) + (mm * 60) + ss);
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}
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else
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/* Default to 2:00 AM. */
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tzr->secs = 2 * 60 * 60;
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tzr->computed_for = -1;
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*tzp = tz;
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return true;
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}
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/* Parse the POSIX TZ-style string. */
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void
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__tzset_parse_tz (const char *tz)
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{
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/* Clear out old state and reset to unnamed UTC. */
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memset (tz_rules, '\0', sizeof tz_rules);
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tz_rules[0].name = tz_rules[1].name = "";
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/* Get the standard timezone name. */
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if (parse_tzname (&tz, 0) && parse_offset (&tz, 0))
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{
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/* Get the DST timezone name (if any). */
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if (*tz != '\0')
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{
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if (parse_tzname (&tz, 1))
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{
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parse_offset (&tz, 1);
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if (*tz == '\0' || (tz[0] == ',' && tz[1] == '\0'))
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{
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/* There is no rule. See if there is a default rule
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file. */
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__tzfile_default (tz_rules[0].name, tz_rules[1].name,
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tz_rules[0].offset, tz_rules[1].offset);
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if (__use_tzfile)
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{
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free (old_tz);
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old_tz = NULL;
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return;
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}
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}
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}
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/* Figure out the standard <-> DST rules. */
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if (parse_rule (&tz, 0))
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parse_rule (&tz, 1);
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}
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else
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{
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/* There is no DST. */
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tz_rules[1].name = tz_rules[0].name;
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tz_rules[1].offset = tz_rules[0].offset;
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}
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}
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update_vars ();
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}
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/* Interpret the TZ envariable. */
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static void
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tzset_internal (int always)
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{
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static int is_initialized;
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const char *tz;
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if (is_initialized && !always)
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return;
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is_initialized = 1;
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/* Examine the TZ environment variable. */
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tz = getenv ("TZ");
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if (tz && *tz == '\0')
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/* User specified the empty string; use UTC explicitly. */
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tz = "Universal";
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/* A leading colon means "implementation defined syntax".
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We ignore the colon and always use the same algorithm:
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try a data file, and if none exists parse the 1003.1 syntax. */
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if (tz && *tz == ':')
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++tz;
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/* Check whether the value changed since the last run. */
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if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0)
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/* No change, simply return. */
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return;
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if (tz == NULL)
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/* No user specification; use the site-wide default. */
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tz = TZDEFAULT;
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tz_rules[0].name = NULL;
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tz_rules[1].name = NULL;
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/* Save the value of `tz'. */
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free (old_tz);
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old_tz = tz ? __strdup (tz) : NULL;
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/* Try to read a data file. */
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__tzfile_read (tz, 0, NULL);
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if (__use_tzfile)
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return;
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/* No data file found. Default to UTC if nothing specified. */
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if (tz == NULL || *tz == '\0'
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|| (TZDEFAULT != NULL && strcmp (tz, TZDEFAULT) == 0))
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{
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memset (tz_rules, '\0', sizeof tz_rules);
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tz_rules[0].name = tz_rules[1].name = "UTC";
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if (J0 != 0)
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tz_rules[0].type = tz_rules[1].type = J0;
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tz_rules[0].change = tz_rules[1].change = (time_t) -1;
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update_vars ();
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return;
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}
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__tzset_parse_tz (tz);
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}
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/* Figure out the exact time (as a time_t) in YEAR
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when the change described by RULE will occur and
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put it in RULE->change, saving YEAR in RULE->computed_for. */
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static void
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compute_change (tz_rule *rule, int year)
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{
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time_t t;
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if (year != -1 && rule->computed_for == year)
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/* Operations on times in 2 BC will be slower. Oh well. */
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return;
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/* First set T to January 1st, 0:00:00 GMT in YEAR. */
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if (year > 1970)
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t = ((year - 1970) * 365
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+ /* Compute the number of leapdays between 1970 and YEAR
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(exclusive). There is a leapday every 4th year ... */
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+ ((year - 1) / 4 - 1970 / 4)
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/* ... except every 100th year ... */
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- ((year - 1) / 100 - 1970 / 100)
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/* ... but still every 400th year. */
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+ ((year - 1) / 400 - 1970 / 400)) * SECSPERDAY;
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else
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t = 0;
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switch (rule->type)
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{
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case J1:
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/* Jn - Julian day, 1 == January 1, 60 == March 1 even in leap years.
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In non-leap years, or if the day number is 59 or less, just
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add SECSPERDAY times the day number-1 to the time of
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January 1, midnight, to get the day. */
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t += (rule->d - 1) * SECSPERDAY;
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if (rule->d >= 60 && __isleap (year))
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t += SECSPERDAY;
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break;
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case J0:
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/* n - Day of year.
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Just add SECSPERDAY times the day number to the time of Jan 1st. */
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t += rule->d * SECSPERDAY;
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break;
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case M:
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/* Mm.n.d - Nth "Dth day" of month M. */
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{
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unsigned int i;
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int d, m1, yy0, yy1, yy2, dow;
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const unsigned short int *myday =
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&__mon_yday[__isleap (year)][rule->m];
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/* First add SECSPERDAY for each day in months before M. */
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t += myday[-1] * SECSPERDAY;
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/* Use Zeller's Congruence to get day-of-week of first day of month. */
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m1 = (rule->m + 9) % 12 + 1;
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yy0 = (rule->m <= 2) ? (year - 1) : year;
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yy1 = yy0 / 100;
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yy2 = yy0 % 100;
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dow = ((26 * m1 - 2) / 10 + 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
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if (dow < 0)
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dow += 7;
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/* DOW is the day-of-week of the first day of the month. Get the
|
||
day-of-month (zero-origin) of the first DOW day of the month. */
|
||
d = rule->d - dow;
|
||
if (d < 0)
|
||
d += 7;
|
||
for (i = 1; i < rule->n; ++i)
|
||
{
|
||
if (d + 7 >= (int) myday[0] - myday[-1])
|
||
break;
|
||
d += 7;
|
||
}
|
||
|
||
/* D is the day-of-month (zero-origin) of the day we want. */
|
||
t += d * SECSPERDAY;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* T is now the Epoch-relative time of 0:00:00 GMT on the day we want.
|
||
Just add the time of day and local offset from GMT, and we're done. */
|
||
|
||
rule->change = t - rule->offset + rule->secs;
|
||
rule->computed_for = year;
|
||
}
|
||
|
||
|
||
/* Figure out the correct timezone for TM and set `__tzname',
|
||
`__timezone', and `__daylight' accordingly. */
|
||
void
|
||
__tz_compute (time_t timer, struct tm *tm, int use_localtime)
|
||
{
|
||
compute_change (&tz_rules[0], 1900 + tm->tm_year);
|
||
compute_change (&tz_rules[1], 1900 + tm->tm_year);
|
||
|
||
if (use_localtime)
|
||
{
|
||
int isdst;
|
||
|
||
/* We have to distinguish between northern and southern
|
||
hemisphere. For the latter the daylight saving time
|
||
ends in the next year. */
|
||
if (__builtin_expect (tz_rules[0].change
|
||
> tz_rules[1].change, 0))
|
||
isdst = (timer < tz_rules[1].change
|
||
|| timer >= tz_rules[0].change);
|
||
else
|
||
isdst = (timer >= tz_rules[0].change
|
||
&& timer < tz_rules[1].change);
|
||
tm->tm_isdst = isdst;
|
||
tm->tm_zone = __tzname[isdst];
|
||
tm->tm_gmtoff = tz_rules[isdst].offset;
|
||
}
|
||
}
|
||
|
||
/* Reinterpret the TZ environment variable and set `tzname'. */
|
||
#undef tzset
|
||
|
||
void
|
||
__tzset (void)
|
||
{
|
||
__libc_lock_lock (tzset_lock);
|
||
|
||
tzset_internal (1);
|
||
|
||
if (!__use_tzfile)
|
||
{
|
||
/* Set `tzname'. */
|
||
__tzname[0] = (char *) tz_rules[0].name;
|
||
__tzname[1] = (char *) tz_rules[1].name;
|
||
}
|
||
|
||
__libc_lock_unlock (tzset_lock);
|
||
}
|
||
weak_alias (__tzset, tzset)
|
||
|
||
/* Return the `struct tm' representation of *TIMER in the local timezone.
|
||
Use local time if USE_LOCALTIME is nonzero, UTC otherwise. */
|
||
struct tm *
|
||
__tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
|
||
{
|
||
long int leap_correction;
|
||
int leap_extra_secs;
|
||
|
||
if (timer == NULL)
|
||
{
|
||
__set_errno (EINVAL);
|
||
return NULL;
|
||
}
|
||
|
||
__libc_lock_lock (tzset_lock);
|
||
|
||
/* Update internal database according to current TZ setting.
|
||
POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname.
|
||
This is a good idea since this allows at least a bit more parallelism. */
|
||
tzset_internal (tp == &_tmbuf && use_localtime);
|
||
|
||
if (__use_tzfile)
|
||
__tzfile_compute (*timer, use_localtime, &leap_correction,
|
||
&leap_extra_secs, tp);
|
||
else
|
||
{
|
||
if (! __offtime (timer, 0, tp))
|
||
tp = NULL;
|
||
else
|
||
__tz_compute (*timer, tp, use_localtime);
|
||
leap_correction = 0L;
|
||
leap_extra_secs = 0;
|
||
}
|
||
|
||
__libc_lock_unlock (tzset_lock);
|
||
|
||
if (tp)
|
||
{
|
||
if (! use_localtime)
|
||
{
|
||
tp->tm_isdst = 0;
|
||
tp->tm_zone = "GMT";
|
||
tp->tm_gmtoff = 0L;
|
||
}
|
||
|
||
if (__offtime (timer, tp->tm_gmtoff - leap_correction, tp))
|
||
tp->tm_sec += leap_extra_secs;
|
||
else
|
||
tp = NULL;
|
||
}
|
||
|
||
return tp;
|
||
}
|
||
|
||
|
||
libc_freeres_fn (free_mem)
|
||
{
|
||
while (tzstring_list != NULL)
|
||
{
|
||
struct tzstring_l *old = tzstring_list;
|
||
|
||
tzstring_list = tzstring_list->next;
|
||
free (old);
|
||
}
|
||
free (old_tz);
|
||
old_tz = NULL;
|
||
}
|