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

Some of the server implementations don't support dates later
than 2038 due to the internal time type being 32 bit.
Added checks so that the server will refuse dates that cannot
be handled by either throwing an error when setting date at 
runtime or by refusing to start or shutting down the server if 
the system date cannot be stored in my_time_t.

mysql-test/r/variables.result

@@ -910,3 +910,11 @@ set global thread_cache_size         =@my_thread_cache_size;
 # Test 'myisam_mmap_size' option is not dynamic
 SET @@myisam_mmap_size= 500M;
 ERROR HY000: Variable 'myisam_mmap_size' is a read only variable
+#
+# Bug #52315: utc_date() crashes when system time > year 2037
+#
+SET TIMESTAMP=2*1024*1024*1024;
+#Should not crash
+SELECT UTC_DATE();
+SET TIMESTAMP=DEFAULT;
+End of 5.0 tests

mysql-test/t/variables.test

@@ -771,3 +771,17 @@ set global thread_cache_size         =@my_thread_cache_size;
 --echo # Test 'myisam_mmap_size' option is not dynamic
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 SET @@myisam_mmap_size= 500M;
+
+--echo #
+--echo # Bug #52315: utc_date() crashes when system time > year 2037
+--echo #
+
+--error 0, ER_UNKNOWN_ERROR
+SET TIMESTAMP=2*1024*1024*1024;
+--echo #Should not crash
+--disable_result_log
+SELECT UTC_DATE();
+--enable_result_log
+SET TIMESTAMP=DEFAULT;
+
+--echo End of 5.0 tests

sql/mysqld.cc

@@ -2835,6 +2835,14 @@ 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();

sql/set_var.cc

@@ -2712,10 +2712,26 @@ int set_var_collation_client::update(THD *thd)
 
 /****************************************************************************/
 
+bool sys_var_timestamp::check(THD *thd, set_var *var)
+{
+  time_t 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)
+  {
+    my_message(ER_UNKNOWN_ERROR, 
+               "This version of MySQL doesn't support dates later than 2038",
+               MYF(0));
+    return TRUE;
+  }
+  return FALSE;
+}
+
+
 bool sys_var_timestamp::update(THD *thd,  set_var *var)
 {
   thd->set_time((time_t) var->save_result.ulonglong_value);
-  return 0;
+  return FALSE;
 }
 
 

sql/set_var.h

@@ -536,6 +536,7 @@ class sys_var_timestamp :public sys_var
 {
 public:
   sys_var_timestamp(const char *name_arg) :sys_var(name_arg) {}
+  bool check(THD *thd, set_var *var);
   bool update(THD *thd, set_var *var);
   void set_default(THD *thd, enum_var_type type);
   bool check_type(enum_var_type type)    { return type == OPT_GLOBAL; }

sql/sql_class.h

@@ -1707,6 +1707,11 @@ public:
   inline void	end_time()    { safe_time(&start_time); }
   inline void	set_time(time_t t) { time_after_lock=start_time=user_time=t; }
   inline void	lock_time()   { safe_time(&time_after_lock); }
+  /*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); 
+  }
   inline void	insert_id(ulonglong id_arg)
   {
     last_insert_id= id_arg;

sql/sql_parse.cc

@@ -1771,6 +1771,19 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   thd->enable_slow_log= TRUE;
   thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
   thd->set_time();
+  if (!thd->is_valid_time())
+  {
+    /*
+     If the time has got past 2038 we need to shut this server down
+     We do this by making sure every command is a shutdown and we 
+     have enough privileges to shut the server down
+
+     TODO: remove this when we have full 64 bit my_time_t support
+    */
+    thd->security_ctx->master_access|= SHUTDOWN_ACL;
+    command= COM_SHUTDOWN;
+  }
+
   VOID(pthread_mutex_lock(&LOCK_thread_count));
   thd->query_id= global_query_id;