Bug#31177: Server variables can't be set to their current values

Default values of variables were not subject to upper/lower bounds
and step, while setting variables was. Bounds and step are also
applied to defaults now; defaults are corrected quietly, values
given by the user are corrected, and a correction-warning is thrown
as needed. Lastly, very large values could wrap around, starting
from 0 again. They are bounded at the maximum value for the
respective data-type now if no lower maximum is specified in the
variable's definition.


client/mysql.cc:
  correct maxima in options array
client/mysqltest.c:
  adjust minimum for "sleep" option so default value is no longer
  out of bounds.
include/m_string.h:
  ullstr() - the unsigned brother of llstr()
include/my_getopt.h:
  Flag if we bounded the value (that is, correct anything aside from
  making value a multiple of block-size)
mysql-test/r/delayed.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/index_merge.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/innodb.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/innodb_mysql.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/key_cache.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/packet.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/ps.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/subselect.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/type_bit.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/type_bit_innodb.result:
  We throw a warning now when we adjust out of range parameters.
mysql-test/r/variables.result:
  correct results: bounds and step apply to variables' default values, too
mysql-test/t/variables.test:
  correct results: bounds and step apply to variables' default values, too
mysys/my_getopt.c:
  - apply bounds/step to default values of variables (based on work by serg)
  - print complaints about incorrect values for variables (truncation etc.,
    by requestion of consulting)
  - if no lower maximum is specified in variable definition, bound unsigned
    values at their maximum to prevent wrap-around
  - some calls to error_reporter had a \n, some didn't. remove \n from calls,
    let reporter-function handle it, so the default reporter behaves like that
    in mysqld
sql/mysql_priv.h:
  correct RANGE_ALLOC_BLOCK_SIZE (cleared with monty)
sql/mysqld.cc:
  correct maxima to correct data-type.
  correct minima where higher than default.
  correct range-alloc-block-size.
  correct inno variables so GET_* corresponds to actual variable's type.
sql/set_var.cc:
  When the new value for a variable is out of bounds, we'll send the
  client a warning (but not if the value was simply not a multiple of
  'blocksize').  sys_var_thd_ulong had this, sys_var_long_ptr_global
  didn't; broken out and streamlined to avoid duplication of code.
strings/llstr.c:
  ullstr() - the unsigned brother of llstr()

client/mysql.cc

@@ -737,9 +737,9 @@ static struct my_option my_long_options[] =
    0, 1},
   {"max_allowed_packet", OPT_MAX_ALLOWED_PACKET,
    "Max packet length to send to, or receive from server",
-   (gptr*) &opt_max_allowed_packet, (gptr*) &opt_max_allowed_packet, 0, GET_ULONG,
-   REQUIRED_ARG, 16 *1024L*1024L, 4096, (longlong) 2*1024L*1024L*1024L,
-   MALLOC_OVERHEAD, 1024, 0},
+   (gptr*) &opt_max_allowed_packet, (gptr*) &opt_max_allowed_packet, 0,
+   GET_ULONG, REQUIRED_ARG, 16 *1024L*1024L, 4096,
+   (longlong) 2*1024L*1024L*1024L, MALLOC_OVERHEAD, 1024, 0},
   {"net_buffer_length", OPT_NET_BUFFER_LENGTH,
    "Buffer for TCP/IP and socket communication",
    (gptr*) &opt_net_buffer_length, (gptr*) &opt_net_buffer_length, 0, GET_ULONG,
@@ -747,12 +747,13 @@ static struct my_option my_long_options[] =
   {"select_limit", OPT_SELECT_LIMIT,
    "Automatic limit for SELECT when using --safe-updates",
    (gptr*) &select_limit,
-   (gptr*) &select_limit, 0, GET_ULONG, REQUIRED_ARG, 1000L, 1, ~0L, 0, 1, 0},
+   (gptr*) &select_limit, 0, GET_ULONG, REQUIRED_ARG, 1000L, 1, ULONG_MAX,
+   0, 1, 0},
   {"max_join_size", OPT_MAX_JOIN_SIZE,
    "Automatic limit for rows in a join when using --safe-updates",
    (gptr*) &max_join_size,
-   (gptr*) &max_join_size, 0, GET_ULONG, REQUIRED_ARG, 1000000L, 1, ~0L, 0, 1,
-   0},
+   (gptr*) &max_join_size, 0, GET_ULONG, REQUIRED_ARG, 1000000L, 1, ULONG_MAX,
+   0, 1, 0},
   {"secure-auth", OPT_SECURE_AUTH, "Refuse client connecting to server if it"
     " uses old (pre-4.1.1) protocol", (gptr*) &opt_secure_auth,
     (gptr*) &opt_secure_auth, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},

client/mysqltest.c

@@ -4986,7 +4986,7 @@ static struct my_option my_long_options[] =
    "Don't use the memory allocation checking.", 0, 0, 0, GET_NO_ARG, NO_ARG,
    0, 0, 0, 0, 0, 0},
   {"sleep", 'T', "Sleep always this many seconds on sleep commands.",
-   (gptr*) &opt_sleep, (gptr*) &opt_sleep, 0, GET_INT, REQUIRED_ARG, -1, 0, 0,
+   (gptr*) &opt_sleep, (gptr*) &opt_sleep, 0, GET_INT, REQUIRED_ARG, -1, -1, 0,
    0, 0, 0},
   {"socket", 'S', "Socket file to use for connection.",
    (gptr*) &unix_sock, (gptr*) &unix_sock, 0, GET_STR, REQUIRED_ARG, 0, 0, 0,

include/m_string.h

@@ -219,6 +219,7 @@ double my_strtod(const char *str, char **end, int *error);
 double my_atof(const char *nptr);
 
 extern char *llstr(longlong value,char *buff);
+extern char *ullstr(longlong value,char *buff);
 #ifndef HAVE_STRTOUL
 extern long strtol(const char *str, char **ptr, int base);
 extern ulong strtoul(const char *str, char **ptr, int base);

include/my_getopt.h

@@ -67,7 +67,8 @@ extern void my_print_variables(const struct my_option *options);
 extern void my_getopt_register_get_addr(gptr* (*func_addr)(const char *, uint,
 							   const struct my_option *));
 
-ulonglong getopt_ull_limit_value(ulonglong num, const struct my_option *optp);
+ulonglong getopt_ull_limit_value(ulonglong num, const struct my_option *optp,
+                                 bool *fixed);
 my_bool getopt_compare_strings(const char *s, const char *t, uint length);
 
 C_MODE_END

mysql-test/r/delayed.result

@@ -109,12 +109,20 @@ c1
 DROP TABLE t1;
 SET             @@auto_increment_offset=
 @bug20627_old_auto_increment_offset;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@auto_increment_increment=
 @bug20627_old_auto_increment_increment;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET             @@session.auto_increment_offset=
 @bug20627_old_session_auto_increment_offset;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@session.auto_increment_increment=
 @bug20627_old_session_auto_increment_increment;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET @bug20830_old_auto_increment_offset=
 @@auto_increment_offset= 2;
 SET @bug20830_old_auto_increment_increment=
@@ -237,12 +245,20 @@ SUM(c1)
 DROP TABLE t1;
 SET             @@auto_increment_offset=
 @bug20830_old_auto_increment_offset;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@auto_increment_increment=
 @bug20830_old_auto_increment_increment;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET             @@session.auto_increment_offset=
 @bug20830_old_session_auto_increment_offset;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@session.auto_increment_increment=
 @bug20830_old_session_auto_increment_increment;
+Warnings:
+Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 CREATE TABLE t1(a BIT);
 INSERT DELAYED INTO t1 VALUES(1);
 FLUSH TABLE t1;

mysql-test/r/index_merge.result

@@ -340,6 +340,8 @@ create table t4 (a int);
 insert into t4 values (1),(4),(3);
 set @save_join_buffer_size=@@join_buffer_size;
 set join_buffer_size= 4000;
+Warnings:
+Warning	1292	Truncated incorrect join_buffer_size value: '4000'
 explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) 
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2) 
 where (A.key1 < 500000 or A.key2 < 3)

mysql-test/r/innodb.result

@@ -1833,6 +1833,8 @@ show variables like "innodb_thread_concurrency";
 Variable_name	Value
 innodb_thread_concurrency	8
 set global innodb_thread_concurrency=1001;
+Warnings:
+Warning	1292	Truncated incorrect innodb_thread_concurrency value: '1001'
 show variables like "innodb_thread_concurrency";
 Variable_name	Value
 innodb_thread_concurrency	1000
@@ -1852,6 +1854,8 @@ show variables like "innodb_concurrency_tickets";
 Variable_name	Value
 innodb_concurrency_tickets	1000
 set global innodb_concurrency_tickets=0;
+Warnings:
+Warning	1292	Truncated incorrect innodb_concurrency_tickets value: '0'
 show variables like "innodb_concurrency_tickets";
 Variable_name	Value
 innodb_concurrency_tickets	1

mysql-test/r/innodb_mysql.result

@@ -712,6 +712,8 @@ INSERT INTO t1(b,c) SELECT b,c FROM t2;
 UPDATE t2 SET c='2007-01-03';
 INSERT INTO t1(b,c) SELECT b,c FROM t2;
 set @@sort_buffer_size=8192;
+Warnings:
+Warning	1292	Truncated incorrect sort_buffer_size value: '8192'
 SELECT COUNT(*) FROM t1;
 COUNT(*)
 3072

mysql-test/r/key_cache.result

@@ -276,6 +276,8 @@ Variable_name	Value
 Key_blocks_unused	KEY_BLOCKS_UNUSED
 set global keycache2.key_buffer_size=0;
 set global keycache3.key_buffer_size=100;
+Warnings:
+Warning	1292	Truncated incorrect key_buffer_size value: '100'
 set global keycache3.key_buffer_size=0;
 create table t1 (mytext text, FULLTEXT (mytext));
 insert t1 values ('aaabbb');

mysql-test/r/packet.result

 set global max_allowed_packet=100;
+Warnings:
+Warning	1292	Truncated incorrect max_allowed_packet value: '100'
 set max_allowed_packet=100;
+Warnings:
+Warning	1292	Truncated incorrect max_allowed_packet value: '100'
 set global net_buffer_length=100;
+Warnings:
+Warning	1292	Truncated incorrect net_buffer_length value: '100'
 set net_buffer_length=100;
+Warnings:
+Warning	1292	Truncated incorrect net_buffer_length value: '100'
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
 len
 1024

mysql-test/r/ps.result

@@ -806,6 +806,8 @@ select @@max_prepared_stmt_count;
 @@max_prepared_stmt_count
 0
 set global max_prepared_stmt_count=10000000000000000;
+Warnings:
+Warning	1292	Truncated incorrect max_prepared_stmt_count value: '10000000000000000'
 select @@max_prepared_stmt_count;
 @@max_prepared_stmt_count
 1048576

mysql-test/r/subselect.result

@@ -3666,6 +3666,8 @@ CREATE TABLE t1 (a int, b int auto_increment, PRIMARY KEY (b));
 CREATE TABLE t2 (x int auto_increment, y int, z int,
 PRIMARY KEY (x), FOREIGN KEY (y) REFERENCES t1 (b));
 SET SESSION sort_buffer_size = 32 * 1024;
+Warnings:
+Warning	1292	Truncated incorrect sort_buffer_size value: '32768'
 SELECT SQL_NO_CACHE COUNT(*) 
 FROM (SELECT  a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c
 FROM t1) t;
@@ -4101,6 +4103,8 @@ INSERT INTO `t1` VALUES ('asdf','2007-02-08 01:11:26');
 INSERT INTO `t2` VALUES ('abcdefghijk');
 INSERT INTO `t2` VALUES ('asdf');
 SET session sort_buffer_size=8192;
+Warnings:
+Warning	1292	Truncated incorrect sort_buffer_size value: '8192'
 SELECT (SELECT 1 FROM  t1 WHERE t1.a=t2.a ORDER BY t1.b LIMIT 1) AS d1 FROM t2;
 d1
 1

mysql-test/r/type_bit.result

@@ -269,6 +269,8 @@ a+0	b+0
 56	379
 68	454
 set @@max_length_for_sort_data=0;
+Warnings:
+Warning	1292	Truncated incorrect max_length_for_sort_data value: '0'
 select a+0, b+0 from t1 where a > 40 and a < 70 order by 2;
 a+0	b+0
 57	135

mysql-test/r/type_bit_innodb.result

@@ -269,6 +269,8 @@ a+0	b+0
 56	379
 68	454
 set @@max_length_for_sort_data=0;
+Warnings:
+Warning	1292	Truncated incorrect max_length_for_sort_data value: '0'
 select a+0, b+0 from t1 where a > 40 and a < 70 order by 2;
 a+0	b+0
 57	135

mysql-test/r/variables.result

@@ -214,6 +214,8 @@ net_read_timeout	600
 net_retry_count	10
 net_write_timeout	500
 set net_buffer_length=1;
+Warnings:
+Warning	1292	Truncated incorrect net_buffer_length value: '1'
 show variables like 'net_buffer_length';
 Variable_name	Value
 net_buffer_length	1024
@@ -238,7 +240,7 @@ show variables like '%alloc%';
 Variable_name	Value
 query_alloc_block_size	8192
 query_prealloc_size	8192
-range_alloc_block_size	2048
+range_alloc_block_size	4096
 transaction_alloc_block_size	8192
 transaction_prealloc_size	4096
 set @@range_alloc_block_size=1024*16;
@@ -263,7 +265,7 @@ show variables like '%alloc%';
 Variable_name	Value
 query_alloc_block_size	8192
 query_prealloc_size	8192
-range_alloc_block_size	2048
+range_alloc_block_size	4096
 transaction_alloc_block_size	8192
 transaction_prealloc_size	4096
 SELECT @@version LIKE 'non-existent';
@@ -321,6 +323,8 @@ select @@autocommit, @@big_tables;
 @@autocommit	@@big_tables
 1	1
 set global binlog_cache_size=100;
+Warnings:
+Warning	1292	Truncated incorrect binlog_cache_size value: '100'
 set bulk_insert_buffer_size=100;
 set character set cp1251_koi8;
 set character set default;
@@ -349,17 +353,27 @@ set global flush_time=100;
 set insert_id=1;
 set interactive_timeout=100;
 set join_buffer_size=100;
+Warnings:
+Warning	1292	Truncated incorrect join_buffer_size value: '100'
 set last_insert_id=1;
 set global local_infile=1;
 set long_query_time=100;
 set low_priority_updates=1;
 set max_allowed_packet=100;
+Warnings:
+Warning	1292	Truncated incorrect max_allowed_packet value: '100'
 set global max_binlog_cache_size=100;
+Warnings:
+Warning	1292	Truncated incorrect max_binlog_cache_size value: '100'
 set global max_binlog_size=100;
+Warnings:
+Warning	1292	Truncated incorrect max_binlog_size value: '100'
 set global max_connect_errors=100;
 set global max_connections=100;
 set global max_delayed_threads=100;
 set max_heap_table_size=100;
+Warnings:
+Warning	1292	Truncated incorrect max_heap_table_size value: '100'
 set max_join_size=100;
 set max_sort_length=100;
 set max_tmp_tables=100;
@@ -370,17 +384,25 @@ select @@max_user_connections;
 set global max_write_lock_count=100;
 set myisam_sort_buffer_size=100;
 set net_buffer_length=100;
+Warnings:
+Warning	1292	Truncated incorrect net_buffer_length value: '100'
 set net_read_timeout=100;
 set net_write_timeout=100;
 set global query_cache_limit=100;
 set global query_cache_size=100;
 set global query_cache_type=demand;
 set read_buffer_size=100;
+Warnings:
+Warning	1292	Truncated incorrect read_buffer_size value: '100'
 set read_rnd_buffer_size=100;
+Warnings:
+Warning	1292	Truncated incorrect read_rnd_buffer_size value: '100'
 set global rpl_recovery_rank=100;
 set global server_id=100;
 set global slow_launch_time=100;
 set sort_buffer_size=100;
+Warnings:
+Warning	1292	Truncated incorrect sort_buffer_size value: '100'
 set @@max_sp_recursion_depth=10;
 select @@max_sp_recursion_depth;
 @@max_sp_recursion_depth
@@ -420,6 +442,8 @@ set storage_engine=myisam;
 set global thread_cache_size=100;
 set timestamp=1, timestamp=default;
 set tmp_table_size=100;
+Warnings:
+Warning	1292	Truncated incorrect tmp_table_size value: '100'
 set tx_isolation="READ-COMMITTED";
 set wait_timeout=100;
 set log_warnings=1;
@@ -570,6 +594,8 @@ SHOW VARIABLES LIKE 'MYISAM_DATA_POINTER_SIZE';
 Variable_name	Value
 myisam_data_pointer_size	7
 SET GLOBAL table_cache=-1;
+Warnings:
+Warning	1292	Truncated incorrect table_cache value: '0'
 SHOW VARIABLES LIKE 'table_cache';
 Variable_name	Value
 table_cache	1

mysql-test/t/variables.test

@@ -126,7 +126,7 @@ set GLOBAL query_cache_size=100000;
 set GLOBAL myisam_max_sort_file_size=2000000;
 show global variables like 'myisam_max_sort_file_size';
 set GLOBAL myisam_max_sort_file_size=default;
---replace_result 2147483647 FILE_SIZE 9223372036854775807 FILE_SIZE
+--replace_result 2147482624 FILE_SIZE 2146435072 FILE_SIZE
 show variables like 'myisam_max_sort_file_size';
 
 set global net_retry_count=10, session net_retry_count=10;

sql/mysql_priv.h

@@ -186,7 +186,7 @@ MY_LOCALE *my_locale_by_number(uint number);
 #define QUERY_ALLOC_PREALLOC_SIZE   	8192
 #define TRANS_ALLOC_BLOCK_SIZE		4096
 #define TRANS_ALLOC_PREALLOC_SIZE	4096
-#define RANGE_ALLOC_BLOCK_SIZE		2048
+#define RANGE_ALLOC_BLOCK_SIZE		4096
 #define ACL_ALLOC_BLOCK_SIZE		1024
 #define UDF_ALLOC_BLOCK_SIZE		1024
 #define TABLE_ALLOC_BLOCK_SIZE		1024

sql/set_var.cc

@@ -113,6 +113,9 @@ static int check_max_delayed_threads(THD *thd, set_var *var);
 static void fix_thd_mem_root(THD *thd, enum_var_type type);
 static void fix_trans_mem_root(THD *thd, enum_var_type type);
 static void fix_server_id(THD *thd, enum_var_type type);
+static ulonglong fix_unsigned(THD *thd, ulonglong num,
+                              const struct my_option *option_limits);
+static void throw_bounds_warning(THD *thd, const char *name, ulonglong num);
 static KEY_CACHE *create_key_cache(const char *name, uint length);
 void fix_sql_mode_var(THD *thd, enum_var_type type);
 static byte *get_error_count(THD *thd);
@@ -1448,6 +1451,27 @@ static void fix_server_id(THD *thd, enum_var_type type)
 }
 
 
+static void throw_bounds_warning(THD *thd, const char *name, ulonglong num)
+{
+  char buf[22];
+  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                      ER_TRUNCATED_WRONG_VALUE,
+                      ER(ER_TRUNCATED_WRONG_VALUE), name,
+                      ullstr(num, buf));
+}
+
+static ulonglong fix_unsigned(THD *thd, ulonglong num,
+                              const struct my_option *option_limits)
+{
+  bool fixed= FALSE;
+  ulonglong out= getopt_ull_limit_value(num, option_limits, &fixed);
+
+  if (fixed)
+    throw_bounds_warning(thd, option_limits->name, num);
+  return out;
+}
+
+
 sys_var_long_ptr::
 sys_var_long_ptr(const char *name_arg, ulong *value_ptr_arg,
                  sys_after_update_func after_update_arg)
@@ -1468,9 +1492,20 @@ bool sys_var_long_ptr_global::update(THD *thd, set_var *var)
   ulonglong tmp= var->save_result.ulonglong_value;
   pthread_mutex_lock(guard);
   if (option_limits)
-    *value= (ulong) getopt_ull_limit_value(tmp, option_limits);
+    *value= (ulong) fix_unsigned(thd, tmp, option_limits);
   else
+  {
+#if SIZEOF_LONG < SIZEOF_LONG_LONG
+    /* Avoid overflows on 32 bit systems */
+    if (tmp > (ulonglong) ~(ulong) 0)
+    {
+      tmp= ((ulonglong) ~(ulong) 0);
+      throw_bounds_warning(thd, name, var->save_result.ulonglong_value);
+    }
+#endif
     *value= (ulong) tmp;
+  }
+
   pthread_mutex_unlock(guard);
   return 0;
 }
@@ -1489,7 +1524,7 @@ bool sys_var_ulonglong_ptr::update(THD *thd, set_var *var)
   ulonglong tmp= var->save_result.ulonglong_value;
   pthread_mutex_lock(&LOCK_global_system_variables);
   if (option_limits)
-    *value= (ulonglong) getopt_ull_limit_value(tmp, option_limits);
+    *value= (ulonglong) fix_unsigned(thd, tmp, option_limits);
   else
     *value= (ulonglong) tmp;
   pthread_mutex_unlock(&LOCK_global_system_variables);
@@ -1539,38 +1574,29 @@ bool sys_var_thd_ulong::check(THD *thd, set_var *var)
 bool sys_var_thd_ulong::update(THD *thd, set_var *var)
 {
   ulonglong tmp= var->save_result.ulonglong_value;
-  char buf[22];
-  bool truncated= false;
 
   /* Don't use bigger value than given with --maximum-variable-name=.. */
   if ((ulong) tmp > max_system_variables.*offset)
   {
-    truncated= true;
-    llstr(tmp, buf);
+    throw_bounds_warning(thd, name, tmp);
     tmp= max_system_variables.*offset;
   }
 
-#if SIZEOF_LONG == 4
-  /* Avoid overflows on 32 bit systems */
-  if (tmp > (ulonglong) ~(ulong) 0)
+  if (option_limits)
+    tmp= (ulong) fix_unsigned(thd, tmp, option_limits);
+#if SIZEOF_LONG < SIZEOF_LONG_LONG
+  else if (tmp > (ulonglong) ~(ulong) 0)
   {
-    truncated= true;
-    llstr(tmp, buf);
     tmp= ((ulonglong) ~(ulong) 0);
+    throw_bounds_warning(thd, name, var->save_result.ulonglong_value);
   }
 #endif
-  if (truncated)
-    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
-                        ER_TRUNCATED_WRONG_VALUE,
-                        ER(ER_TRUNCATED_WRONG_VALUE), name,
-                        buf);
 
-  if (option_limits)
-    tmp= (ulong) getopt_ull_limit_value(tmp, option_limits);
   if (var->type == OPT_GLOBAL)
     global_system_variables.*offset= (ulong) tmp;
   else
     thd->variables.*offset= (ulong) tmp;
+
   return 0;
 }
 
@@ -1605,7 +1631,7 @@ bool sys_var_thd_ha_rows::update(THD *thd, set_var *var)
     tmp= max_system_variables.*offset;
 
   if (option_limits)
-    tmp= (ha_rows) getopt_ull_limit_value(tmp, option_limits);
+    tmp= (ha_rows) fix_unsigned(thd, tmp, option_limits);
   if (var->type == OPT_GLOBAL)
   {
     /* Lock is needed to make things safe on 32 bit systems */
@@ -1649,7 +1675,7 @@ bool sys_var_thd_ulonglong::update(THD *thd,  set_var *var)
     tmp= max_system_variables.*offset;
 
   if (option_limits)
-    tmp= getopt_ull_limit_value(tmp, option_limits);
+    tmp= fix_unsigned(thd, tmp, option_limits);
   if (var->type == OPT_GLOBAL)
   {
     /* Lock is needed to make things safe on 32 bit systems */
@@ -2493,7 +2519,7 @@ bool sys_var_key_buffer_size::update(THD *thd, set_var *var)
   }
 
   key_cache->param_buff_size=
-    (ulonglong) getopt_ull_limit_value(tmp, option_limits);
+    (ulonglong) fix_unsigned(thd, tmp, option_limits);
 
   /* If key cache didn't existed initialize it, else resize it */
   key_cache->in_init= 1;
@@ -2541,7 +2567,7 @@ bool sys_var_key_cache_long::update(THD *thd, set_var *var)
     goto end;
 
   *((ulong*) (((char*) key_cache) + offset))=
-    (ulong) getopt_ull_limit_value(tmp, option_limits);
+    (ulong) fix_unsigned(thd, tmp, option_limits);
 
   /*
     Don't create a new key cache if it didn't exist

strings/llstr.c

@@ -32,3 +32,9 @@ char *llstr(longlong value,char *buff)
   longlong10_to_str(value,buff,-10);
   return buff;
 }
+
+char *ullstr(longlong value,char *buff)
+{
+  longlong10_to_str(value,buff,10);
+  return buff;
+}