[MDEV-20944] Wrong result of LEAST() and ASAN heap-use-after-free in my_strnncollsp_simple / Item::temporal_precision on TIME() - Jira

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Type: Bug
Status: Open (View Workflow)
Priority: Major
Resolution: Unresolved
Affects Version/s: 10.1, 10.2, 10.3, 10.4, 10.5, 10.6
Fix Version/s: 10.4, 10.5, 10.6
Component/s: Character Sets, Temporal Types
Labels:
None

Description

SET NAMES latin1;

SELECT LEAST( CAST( 0 AS CHAR ), OLD_PASSWORD( 1 ) );

Actual result
MariaDB [(none)]> SELECT LEAST( CAST( 0 AS CHAR ), OLD_PASSWORD( 1 ) );
+-----------------------------------------------+
\| LEAST( CAST( 0 AS CHAR ), OLD_PASSWORD( 1 ) ) \|
+-----------------------------------------------+
\| 1 \|
+-----------------------------------------------+
1 row in set (0.000 sec)

Expected result is 0.

Reproducible on 10.1-10.5 with latin1. Not reproducible with utf8. I didn't try other character sets.

Further, on 10.1 / 10.2 (but not on 10.3+) the following returns an ASAN error, I suppose it's a side effect of the above:

SET NAMES latin1;

SELECT TIME( LEAST( CAST( 0 AS CHAR ), OLD_PASSWORD( 1 ) ) );

10.2 1552b254
==14630==ERROR: AddressSanitizer: heap-use-after-free on address 0x60d0000318e0 at pc 0x5648a32eac74 bp 0x7f9fd828bc70 sp 0x7f9fd828bc68
READ of size 1 at 0x60d0000318e0 thread T5
#0 0x5648a32eac73 in my_strnncollsp_simple /data/src/10.2/strings/ctype-simple.c:182
#1 0x5648a1dfe409 in sortcmp(String const, String const, charset_info_st const*) /data/src/10.2/sql/sql_string.cc:804
#2 0x5648a233b8e3 in Item_func_min_max::val_str(String*) /data/src/10.2/sql/item_func.cc:2970
#3 0x5648a2239c5f in Item::temporal_precision(enum_field_types) /data/src/10.2/sql/item.cc:576
#4 0x5648a2454b0b in Item_temporal_typecast::fix_length_and_dec() /data/src/10.2/sql/item_timefunc.h:1099
#5 0x5648a231b4c1 in Item_func::fix_fields(THD, Item*) /data/src/10.2/sql/item_func.cc:229
#6 0x5648a1b3293c in setup_fields(THD, Bounds_checked_array<Item>, List<Item>&, enum_mark_columns, List<Item>, List<Item>, bool) /data/src/10.2/sql/sql_base.cc:7186
#7 0x5648a1cb83f9 in JOIN::prepare(TABLE_LIST, unsigned int, Item, unsigned int, st_order, bool, st_order, Item, st_order, st_select_lex, st_select_lex_unit) /data/src/10.2/sql/sql_select.cc:811
#8 0x5648a1cd5549 in mysql_select(THD, TABLE_LIST, unsigned int, List<Item>&, Item, unsigned int, st_order, st_order, Item, st_order, unsigned long long, select_result, st_select_lex_unit, st_select_lex) /data/src/10.2/sql/sql_select.cc:3796
#9 0x5648a1cb4aad in handle_select(THD, LEX, select_result*, unsigned long) /data/src/10.2/sql/sql_select.cc:361
#10 0x5648a1c3a2c6 in execute_sqlcom_select /data/src/10.2/sql/sql_parse.cc:6225
#11 0x5648a1c2861b in mysql_execute_command(THD*) /data/src/10.2/sql/sql_parse.cc:3532
#12 0x5648a1c42d48 in mysql_parse(THD, char, unsigned int, Parser_state*, bool, bool) /data/src/10.2/sql/sql_parse.cc:7740
#13 0x5648a1c1ee06 in dispatch_command(enum_server_command, THD, char, unsigned int, bool, bool) /data/src/10.2/sql/sql_parse.cc:1831
#14 0x5648a1c1be1c in do_command(THD*) /data/src/10.2/sql/sql_parse.cc:1384
#15 0x5648a1f562dd in do_handle_one_connection(CONNECT*) /data/src/10.2/sql/sql_connect.cc:1336
#16 0x5648a1f55cad in handle_one_connection /data/src/10.2/sql/sql_connect.cc:1241
#17 0x5648a318c7c2 in pfs_spawn_thread /data/src/10.2/storage/perfschema/pfs.cc:1862
#18 0x7f9fe3b5d4a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)
#19 0x7f9fe20a4d0e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe8d0e)

0x60d0000318e0 is located 112 bytes inside of 140-byte region [0x60d000031870,0x60d0000318fc)
freed by thread T5 here:
#0 0x7f9fe3e34a10 in free (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1a10)
#1 0x5648a3292625 in free_memory /data/src/10.2/mysys/safemalloc.c:279
#2 0x5648a3291c9f in sf_free /data/src/10.2/mysys/safemalloc.c:197
#3 0x5648a3262aab in my_free /data/src/10.2/mysys/my_malloc.c:218
#4 0x5648a1a45eaf in String::free() /data/src/10.2/sql/sql_string.h:347
#5 0x5648a1a66e7e in String::set(char, unsigned int, charset_info_st const) /data/src/10.2/sql/sql_string.h:264
#6 0x5648a23a5536 in Item_func_password::val_str_ascii(String*) /data/src/10.2/sql/item_strfunc.cc:2167
#7 0x5648a23920b7 in Item_func::val_str_from_val_str_ascii(String, String) /data/src/10.2/sql/item_strfunc.cc:82
#8 0x5648a2143899 in Item_str_ascii_func::val_str(String*) /data/src/10.2/sql/item_strfunc.h:94
#9 0x5648a233b894 in Item_func_min_max::val_str(String*) /data/src/10.2/sql/item_func.cc:2967
#10 0x5648a2239c5f in Item::temporal_precision(enum_field_types) /data/src/10.2/sql/item.cc:576
#11 0x5648a2454b0b in Item_temporal_typecast::fix_length_and_dec() /data/src/10.2/sql/item_timefunc.h:1099
#12 0x5648a231b4c1 in Item_func::fix_fields(THD, Item*) /data/src/10.2/sql/item_func.cc:229
#13 0x5648a1b3293c in setup_fields(THD, Bounds_checked_array<Item>, List<Item>&, enum_mark_columns, List<Item>, List<Item>, bool) /data/src/10.2/sql/sql_base.cc:7186
#14 0x5648a1cb83f9 in JOIN::prepare(TABLE_LIST, unsigned int, Item, unsigned int, st_order, bool, st_order, Item, st_order, st_select_lex, st_select_lex_unit) /data/src/10.2/sql/sql_select.cc:811
#15 0x5648a1cd5549 in mysql_select(THD, TABLE_LIST, unsigned int, List<Item>&, Item, unsigned int, st_order, st_order, Item, st_order, unsigned long long, select_result, st_select_lex_unit, st_select_lex) /data/src/10.2/sql/sql_select.cc:3796
#16 0x5648a1cb4aad in handle_select(THD, LEX, select_result*, unsigned long) /data/src/10.2/sql/sql_select.cc:361
#17 0x5648a1c3a2c6 in execute_sqlcom_select /data/src/10.2/sql/sql_parse.cc:6225
#18 0x5648a1c2861b in mysql_execute_command(THD*) /data/src/10.2/sql/sql_parse.cc:3532
#19 0x5648a1c42d48 in mysql_parse(THD, char, unsigned int, Parser_state*, bool, bool) /data/src/10.2/sql/sql_parse.cc:7740
#20 0x5648a1c1ee06 in dispatch_command(enum_server_command, THD, char, unsigned int, bool, bool) /data/src/10.2/sql/sql_parse.cc:1831
#21 0x5648a1c1be1c in do_command(THD*) /data/src/10.2/sql/sql_parse.cc:1384
#22 0x5648a1f562dd in do_handle_one_connection(CONNECT*) /data/src/10.2/sql/sql_connect.cc:1336
#23 0x5648a1f55cad in handle_one_connection /data/src/10.2/sql/sql_connect.cc:1241
#24 0x5648a318c7c2 in pfs_spawn_thread /data/src/10.2/storage/perfschema/pfs.cc:1862
#25 0x7f9fe3b5d4a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)

previously allocated by thread T5 here:
#0 0x7f9fe3e34d28 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1d28)
#1 0x5648a3291676 in sf_malloc /data/src/10.2/mysys/safemalloc.c:118
#2 0x5648a326220e in my_malloc /data/src/10.2/mysys/my_malloc.c:101
#3 0x5648a1df9b06 in String::real_alloc(unsigned long) /data/src/10.2/sql/sql_string.cc:45
#4 0x5648a1a66fd9 in String::alloc(unsigned long) /data/src/10.2/sql/sql_string.h:357
#5 0x5648a1dfa14c in String::set_int(long long, bool, charset_info_st const*) /data/src/10.2/sql/sql_string.cc:128
#6 0x5648a224cd1a in Item_int::val_str(String*) /data/src/10.2/sql/item.cc:3086
#7 0x5648a2449d9e in Item_char_typecast::val_str(String*) /data/src/10.2/sql/item_timefunc.cc:2505
#8 0x5648a233b72a in Item_func_min_max::val_str(String*) /data/src/10.2/sql/item_func.cc:2963
#9 0x5648a2239c5f in Item::temporal_precision(enum_field_types) /data/src/10.2/sql/item.cc:576
#10 0x5648a2454b0b in Item_temporal_typecast::fix_length_and_dec() /data/src/10.2/sql/item_timefunc.h:1099
#11 0x5648a231b4c1 in Item_func::fix_fields(THD, Item*) /data/src/10.2/sql/item_func.cc:229
#12 0x5648a1b3293c in setup_fields(THD, Bounds_checked_array<Item>, List<Item>&, enum_mark_columns, List<Item>, List<Item>, bool) /data/src/10.2/sql/sql_base.cc:7186
#13 0x5648a1cb83f9 in JOIN::prepare(TABLE_LIST, unsigned int, Item, unsigned int, st_order, bool, st_order, Item, st_order, st_select_lex, st_select_lex_unit) /data/src/10.2/sql/sql_select.cc:811
#14 0x5648a1cd5549 in mysql_select(THD, TABLE_LIST, unsigned int, List<Item>&, Item, unsigned int, st_order, st_order, Item, st_order, unsigned long long, select_result, st_select_lex_unit, st_select_lex) /data/src/10.2/sql/sql_select.cc:3796
#15 0x5648a1cb4aad in handle_select(THD, LEX, select_result*, unsigned long) /data/src/10.2/sql/sql_select.cc:361
#16 0x5648a1c3a2c6 in execute_sqlcom_select /data/src/10.2/sql/sql_parse.cc:6225
#17 0x5648a1c2861b in mysql_execute_command(THD*) /data/src/10.2/sql/sql_parse.cc:3532
#18 0x5648a1c42d48 in mysql_parse(THD, char, unsigned int, Parser_state*, bool, bool) /data/src/10.2/sql/sql_parse.cc:7740
#19 0x5648a1c1ee06 in dispatch_command(enum_server_command, THD, char, unsigned int, bool, bool) /data/src/10.2/sql/sql_parse.cc:1831
#20 0x5648a1c1be1c in do_command(THD*) /data/src/10.2/sql/sql_parse.cc:1384
#21 0x5648a1f562dd in do_handle_one_connection(CONNECT*) /data/src/10.2/sql/sql_connect.cc:1336
#22 0x5648a1f55cad in handle_one_connection /data/src/10.2/sql/sql_connect.cc:1241
#23 0x5648a318c7c2 in pfs_spawn_thread /data/src/10.2/storage/perfschema/pfs.cc:1862
#24 0x7f9fe3b5d4a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)

Thread T5 created by T0 here:
#0 0x7f9fe3da3f59 in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x30f59)
#1 0x5648a318cbfe in spawn_thread_v1 /data/src/10.2/storage/perfschema/pfs.cc:1912
#2 0x5648a1a246b2 in inline_mysql_thread_create /data/src/10.2/include/mysql/psi/mysql_thread.h:1239
#3 0x5648a1a38cac in create_thread_to_handle_connection(CONNECT*) /data/src/10.2/sql/mysqld.cc:6506
#4 0x5648a1a3938f in create_new_thread /data/src/10.2/sql/mysqld.cc:6576
#5 0x5648a1a3a3a7 in handle_connections_sockets() /data/src/10.2/sql/mysqld.cc:6851
#6 0x5648a1a38217 in mysqld_main(int, char**) /data/src/10.2/sql/mysqld.cc:6125
#7 0x5648a1a2303f in main /data/src/10.2/sql/main.cc:25
#8 0x7f9fe1fdc2e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)

SUMMARY: AddressSanitizer: heap-use-after-free /data/src/10.2/strings/ctype-simple.c:182 in my_strnncollsp_simple
Shadow bytes around the buggy address:
0x0c1a7fffe2c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c1a7fffe2d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c1a7fffe2e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c1a7fffe2f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c1a7fffe300: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fd fd
=>0x0c1a7fffe310: fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd fd fd
0x0c1a7fffe320: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c1a7fffe330: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa
0x0c1a7fffe340: fa fa fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c1a7fffe350: fd fd fd fd fa fa fa fa fa fa fa fa fd fd fd fd
0x0c1a7fffe360: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==14630==ABORTING

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Assignee:: Alexander Barkov

Reporter:: Elena Stepanova

Votes:: 0 Vote for this issue

Watchers:: 1 Start watching this issue

Dates

Created:: 2019-11-01 15:37

Updated:: 2023-04-27 13:50

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