Commit 3ec542df authored by petr/cps@mysql.com/owlet.local's avatar petr/cps@mysql.com/owlet.local
Browse files

Fix Bug #9191 "TIMESTAMP/from_unixtime() no longer accepts 2^31-1" 

(4.1 version, with post-review fixes)
  
  The fix for another Bug (6439) limited FROM_UNIXTIME() to
  TIMESTAMP_MAX_VALUE which is 2145916799 or 2037-12-01 23:59:59 GMT,
  however unix timestamp in general is not considered to be limited 
  by this value. All dates up to power(2,31)-1 are valid.
  
  This patch extends allowed TIMESTAMP range so, that max
  TIMESTAMP value is power(2,31)-1. It also corrects
  FROM_UNIXTIME() and UNIX_TIMESTAMP() functions, so that
  max allowed UNIX_TIMESTAMP() is power(2,31)-1. FROM_UNIXTIME()
  is fixed accordingly to allow conversion of dates up to
  2038-01-19 03:14:07 UTC. The patch also fixes CONVERT_TZ()
  function to allow extended range of dates.
  
  The main problem solved in the patch is possible overflows
  of variables, used in broken-time representation to time_t
  conversion (required for UNIX_TIMESTAMP).
parent acaa584c

acinclude.m4

+24 −0
Original line number Diff line number Diff line
@@ -1835,6 +1835,30 @@ dnl END OF MYSQL_CHECK_NDBCLUSTER SECTION 
dnl ---------------------------------------------------------------------------





dnl

dnl  Macro to check time_t range: according to C standard

dnl  array index myst be greater then 0 => if time_t is signed

dnl  the code in the macros below won't compile.

dnl



AC_DEFUN([MYSQL_CHECK_TIME_T],[

    AC_MSG_CHECKING(if time_t is unsigned)

    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(

        [[

#include <time.h>

        ]],

        [[

        int array[(((time_t)-1) > 0) ? 1 : -1];

        ]] )

    ], [

    AC_DEFINE([TIME_T_UNSIGNED], 1, [Define to 1 if time_t is unsigned])

    AC_MSG_RESULT(yes)

    ],

    [AC_MSG_RESULT(no)]

    )

])





dnl By default, many hosts won't let programs access large files;

dnl one must use special compiler options to get large-file access to work.

dnl For more details about this brain damage please see:

configure.in

+7 −0
Original line number Diff line number Diff line
@@ -1820,6 +1820,13 @@ then 
  AC_MSG_ERROR("MySQL needs a off_t type.")

fi



dnl

dnl check if time_t is unsigned

dnl



MYSQL_CHECK_TIME_T





# do we need #pragma interface/#pragma implementation ?

# yes if it's gcc 2.x, and not icc pretending to be gcc, and not cygwin

AC_MSG_CHECKING(the need for @%:@pragma interface/implementation)

include/my_time.h

+32 −0
Original line number Diff line number Diff line
@@ -38,6 +38,14 @@ typedef long my_time_t; 
#define MY_TIME_T_MAX LONG_MAX

#define MY_TIME_T_MIN LONG_MIN





/* Time handling defaults */

#define TIMESTAMP_MAX_YEAR 2038

#define YY_PART_YEAR	   70

#define TIMESTAMP_MIN_YEAR (1900 + YY_PART_YEAR - 1)

#define TIMESTAMP_MAX_VALUE INT_MAX32

#define TIMESTAMP_MIN_VALUE 1



#define YY_PART_YEAR	   70



/* Flags to str_to_datetime */
@@ -55,6 +63,30 @@ long calc_daynr(uint year,uint month,uint day); 


void init_time(void);





/*

  Function to check sanity of a TIMESTAMP value



  DESCRIPTION

    Check if a given MYSQL_TIME value fits in TIMESTAMP range.

    This function doesn't make precise check, but rather a rough

    estimate.



  RETURN VALUES

    FALSE   The value seems sane

    TRUE    The MYSQL_TIME value is definitely out of range

*/



static inline bool validate_timestamp_range(const MYSQL_TIME *t)

{

  if ((t->year > TIMESTAMP_MAX_YEAR || t->year < TIMESTAMP_MIN_YEAR) ||

      (t->year == TIMESTAMP_MAX_YEAR && (t->month > 1 || t->day > 19)) ||

      (t->year == TIMESTAMP_MIN_YEAR && (t->month < 12 || t->day < 31)))

    return FALSE;



  return TRUE;

}



my_time_t 

my_system_gmt_sec(const MYSQL_TIME *t, long *my_timezone, bool *in_dst_time_gap);

mysql-test/r/func_time.result

+38 −2
Original line number Diff line number Diff line
@@ -483,12 +483,48 @@ unix_timestamp('1969-12-01 19:00:01') 
select from_unixtime(-1);

from_unixtime(-1)

NULL

select from_unixtime(2145916800);

from_unixtime(2145916800)

select from_unixtime(2147483647);

from_unixtime(2147483647)

2038-01-19 06:14:07

select from_unixtime(2147483648);

from_unixtime(2147483648)

NULL

select from_unixtime(0);

from_unixtime(0)

1970-01-01 03:00:00

select unix_timestamp(from_unixtime(2147483647));

unix_timestamp(from_unixtime(2147483647))

2147483647

select unix_timestamp(from_unixtime(2147483648));

unix_timestamp(from_unixtime(2147483648))

NULL

select unix_timestamp('2039-01-20 01:00:00');

unix_timestamp('2039-01-20 01:00:00')

0

select unix_timestamp('1968-01-20 01:00:00');

unix_timestamp('1968-01-20 01:00:00')

0

select unix_timestamp('2038-02-10 01:00:00');

unix_timestamp('2038-02-10 01:00:00')

0

select unix_timestamp('1969-11-20 01:00:00');

unix_timestamp('1969-11-20 01:00:00')

0

select unix_timestamp('2038-01-20 01:00:00');

unix_timestamp('2038-01-20 01:00:00')

0

select unix_timestamp('1969-12-30 01:00:00');

unix_timestamp('1969-12-30 01:00:00')

0

select unix_timestamp('2038-01-17 12:00:00');

unix_timestamp('2038-01-17 12:00:00')

2147331600

select unix_timestamp('1970-01-01 03:00:01');

unix_timestamp('1970-01-01 03:00:01')

1

select unix_timestamp('2038-01-19 07:14:07');

unix_timestamp('2038-01-19 07:14:07')

0

CREATE TABLE t1 (datetime datetime, timestamp timestamp, date date, time time);

INSERT INTO t1 values ("2001-01-02 03:04:05", "2002-01-02 03:04:05", "2003-01-02", "06:07:08");

SELECT * from t1;

mysql-test/r/timezone.result

+4 −4
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ Warning 1299 Invalid TIMESTAMP value in column 'ts' at row 2 
DROP TABLE t1;

select unix_timestamp('1970-01-01 01:00:00'), 

unix_timestamp('1970-01-01 01:00:01'),

unix_timestamp('2038-01-01 00:59:59'),

unix_timestamp('2038-01-01 01:00:00');

unix_timestamp('1970-01-01 01:00:00')	unix_timestamp('1970-01-01 01:00:01')	unix_timestamp('2038-01-01 00:59:59')	unix_timestamp('2038-01-01 01:00:00')

0	1	2145916799	0
 
unix_timestamp('2038-01-19 04:14:07'),

unix_timestamp('2038-01-19 04:14:08');

unix_timestamp('1970-01-01 01:00:00')	unix_timestamp('1970-01-01 01:00:01')	unix_timestamp('2038-01-19 04:14:07')	unix_timestamp('2038-01-19 04:14:08')

0	1	2147483647	0