Fixes for Bug #55755 and Bug #52315 part 2

Bug #55755 : Date STD variable signness breaks server on FreeBSD and OpenBSD

* Added a check to configure on the size of time_t
* Created a macro to check for a valid time_t that is safe to use with datetime 
  functions and store in TIMESTAMP columns.
* Used the macro consistently instead of the ad-hoc checks introduced by 52315
* Fixed compliation warnings on platforms where the size of time_t is smaller than
  the size of a long (e.g. OpenBSD 4.8 64 amd64).

Bug #52315: utc_date() crashes when system time > year 2037

* Added a correct check for the timestamp range instead of just variable size check to
SET TIMESTAMP.
* Added overflow checking before converting to time_t. 
* Using a correct localized error message in this case instead of the generic error.
* Added a test suite.
* fixed the checks so that they check for unsigned time_t as well. Used the checks 
  consistently across the source code.
* fixed the original test case to expect the new error code.

configure.in

@@ -1956,6 +1956,15 @@ dnl
 
 MYSQL_CHECK_TIME_T
 
+dnl
+dnl check size of time_t
+dnl
+
+AC_CHECK_SIZEOF(time_t, 8)
+if test "$ac_cv_sizeof_time_t" -eq 0
+then
+  AC_MSG_ERROR("MySQL needs a time_t type.")
+fi
 
 # do we need #pragma interface/#pragma implementation ?
 # yes if it's gcc 2.x, and not icc pretending to be gcc, and not cygwin

include/config-win.h

@@ -167,6 +167,11 @@ typedef uint rf_SetTimer;
 #define SIZEOF_LONG		4
 #define SIZEOF_LONG_LONG	8
 #define SIZEOF_OFF_T		8
+/*
+  The size of time_t depends on the compiler.
+  But it's 8 for all the supported VC versions.
+*/
+#define SIZEOF_TIME_T		8
 #ifdef _WIN64
 #define SIZEOF_CHARP		8
 #else

include/my_time.h

@@ -53,6 +53,19 @@ typedef long my_time_t;
 
 #define YY_PART_YEAR	   70
 
+/*
+  check for valid times only if the range of time_t is greater than
+  the range of my_time_t
+*/
+#if SIZEOF_TIME_T > 4 || defined(TIME_T_UNSIGNED)
+# define IS_TIME_T_VALID_FOR_TIMESTAMP(x) \
+    ((x) <= TIMESTAMP_MAX_VALUE && \
+     (x) >= TIMESTAMP_MIN_VALUE)
+#else
+# define IS_TIME_T_VALID_FOR_TIMESTAMP(x) \
+    ((x) >= TIMESTAMP_MIN_VALUE)
+#endif
+
 /* Flags to str_to_datetime */
 #define TIME_FUZZY_DATE		1
 #define TIME_DATETIME_ONLY	2

mysql-test/r/func_time.result

@@ -1323,4 +1323,21 @@ SELECT '2008-02-18' + INTERVAL 1 FRAC_SECOND;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FRAC_SECOND' at line 1
 SELECT '2008-02-18' - INTERVAL 1 FRAC_SECOND;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FRAC_SECOND' at line 1
+#
+# Bug #52315 part 2 : utc_date() crashes when system time > year 2037
+#
+SET TIMESTAMP=-147490000;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=2147483648;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=2147483646;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=2147483647;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=0;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=-1;
+SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=1;
+SELECT UTC_TIMESTAMP();
 End of 5.0 tests

mysql-test/t/func_time.test

@@ -838,4 +838,23 @@ SELECT '2008-02-18' + INTERVAL 1 FRAC_SECOND;
 --error ER_PARSE_ERROR
 SELECT '2008-02-18' - INTERVAL 1 FRAC_SECOND;
 
+
+--echo #
+--echo # Bug #52315 part 2 : utc_date() crashes when system time > year 2037
+--echo #
+
+--disable_result_log
+--error ER_WRONG_VALUE_FOR_VAR
+SET TIMESTAMP=-147490000; SELECT UTC_TIMESTAMP();
+--error ER_WRONG_VALUE_FOR_VAR
+SET TIMESTAMP=2147483648; SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=2147483646; SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=2147483647; SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=0; SELECT UTC_TIMESTAMP();
+--error ER_WRONG_VALUE_FOR_VAR
+SET TIMESTAMP=-1; SELECT UTC_TIMESTAMP();
+SET TIMESTAMP=1; SELECT UTC_TIMESTAMP();
+--enable_result_log
+
+
 --echo End of 5.0 tests

mysql-test/t/variables.test

@@ -776,7 +776,7 @@ SET @@myisam_mmap_size= 500M;
 --echo # Bug #52315: utc_date() crashes when system time > year 2037
 --echo #
 
---error 0, ER_UNKNOWN_ERROR
+--error 0, ER_WRONG_VALUE_FOR_VAR
 SET TIMESTAMP=2*1024*1024*1024;
 --echo #Should not crash
 --disable_result_log

sql-common/my_time.c

@@ -985,7 +985,7 @@ my_system_gmt_sec(const MYSQL_TIME *t_src, long *my_timezone,
     with unsigned time_t tmp+= shift*86400L might result in a number,
     larger then TIMESTAMP_MAX_VALUE, so another check will work.
   */
-  if ((tmp < TIMESTAMP_MIN_VALUE) || (tmp > TIMESTAMP_MAX_VALUE))
+  if (!IS_TIME_T_VALID_FOR_TIMESTAMP(tmp))
     tmp= 0;
 
   return (my_time_t) tmp;

sql/mysqld.cc

@@ -2836,13 +2836,6 @@ static int init_common_variables(const char *conf_file_name, int argc,
   max_system_variables.pseudo_thread_id= (ulong)~0;
   server_start_time= flush_status_time= time((time_t*) 0);
   
-  /* TODO: remove this when my_time_t is 64 bit compatible */
-  if (server_start_time >= (time_t) MY_TIME_T_MAX)
-  {
-    sql_print_error("This MySQL server doesn't support dates later then 2038");
-    return 1;
-  }
-
   if (init_thread_environment())
     return 1;
   mysql_init_variables();
@@ -2882,6 +2875,13 @@ static int init_common_variables(const char *conf_file_name, int argc,
   mysql_slow_log.init_pthread_objects();
   mysql_bin_log.init_pthread_objects();
 
+  /* TODO: remove this when my_time_t is 64 bit compatible */
+  if (!IS_TIME_T_VALID_FOR_TIMESTAMP(server_start_time))
+  {
+    sql_print_error("This MySQL server doesn't support dates later then 2038");
+    return 1;
+  }
+
   if (gethostname(glob_hostname,sizeof(glob_hostname)) < 0)
   {
     strmake(glob_hostname, STRING_WITH_LEN("localhost"));

sql/set_var.cc

@@ -2714,14 +2714,14 @@ int set_var_collation_client::update(THD *thd)
 
 bool sys_var_timestamp::check(THD *thd, set_var *var)
 {
-  time_t val;
+  longlong val;
   var->save_result.ulonglong_value= var->value->val_int();
-  val= (time_t) var->save_result.ulonglong_value;
-  if (val < (time_t) MY_TIME_T_MIN || val > (time_t) MY_TIME_T_MAX)
+  val= (longlong) var->save_result.ulonglong_value;
+  if (val != 0 &&          // this is how you set the default value
+      (val < TIMESTAMP_MIN_VALUE || val > TIMESTAMP_MAX_VALUE))
   {
-    my_message(ER_UNKNOWN_ERROR, 
-               "This version of MySQL doesn't support dates later than 2038",
-               MYF(0));
+    char buf[64];
+    my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), "timestamp", llstr(val, buf));
     return TRUE;
   }
   return FALSE;

sql/sql_class.h

@@ -1710,7 +1710,7 @@ public:
   /*TODO: this will be obsolete when we have support for 64 bit my_time_t */
   inline bool	is_valid_time() 
   { 
-    return (start_time < (time_t) MY_TIME_T_MAX); 
+    return (IS_TIME_T_VALID_FOR_TIMESTAMP(start_time));
   }
   inline void	insert_id(ulonglong id_arg)
   {