AddressSanitizer: stack-buffer-overflow in strxmov

CREATE TABLE `##################################################_long`.`#################################################_long`(a SERIAL);

==1279673==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x152ed05ed540 at pc 0x5646791af09a bp 0x152ed05ec090 sp 0x152ed05ec080

WRITE of size 1 at 0x152ed05ed540 thread T14

    #0 0x5646791af099 in strxmov /test/10.11_dbg_san/strings/strxmov.c:53

    #1 0x56467549396f in deletefrm(char const*) /test/10.11_dbg_san/sql/discover.h:31

    #2 0x56467549396f in create_table_impl /test/10.11_dbg_san/sql/sql_table.cc:4600

    #3 0x564675494d4f in mysql_create_table_no_lock(THD*, st_ddl_log_state*, st_ddl_log_state*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*, Table_specification_st*, Alter_info*, bool*, int, TABLE_LIST*) /test/10.11_dbg_san/sql/sql_table.cc:4697

    #4 0x5646754a07cc in mysql_create_table /test/10.11_dbg_san/sql/sql_table.cc:4813

    #5 0x5646754a07cc in Sql_cmd_create_table_like::execute(THD*) /test/10.11_dbg_san/sql/sql_table.cc:12334

    #6 0x564674df5903 in mysql_execute_command(THD*, bool) /test/10.11_dbg_san/sql/sql_parse.cc:5997

    #7 0x564674d3bc88 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/10.11_dbg_san/sql/sql_parse.cc:8035

    #8 0x564674da885f in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/10.11_dbg_san/sql/sql_parse.cc:1894

    #9 0x564674dbaa70 in do_command(THD*, bool) /test/10.11_dbg_san/sql/sql_parse.cc:1407

    #10 0x56467582bb41 in do_handle_one_connection(CONNECT*, bool) /test/10.11_dbg_san/sql/sql_connect.cc:1418

    #11 0x56467582e32c in handle_one_connection /test/10.11_dbg_san/sql/sql_connect.cc:1312

    #12 0x152ef3730608 in start_thread /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477

    #13 0x152ef29a5132 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x11f132)

Address 0x152ed05ed540 is located in stack of thread T14 at offset 4704 in frame

    #0 0x56467548f5ba in create_table_impl /test/10.11_dbg_san/sql/sql_table.cc:4327

  This frame has 7 object(s):

    [48, 52) 'options' (line 4323)

    [64, 72) 'db_type' (line 4429)

    [96, 104) 'no_fields' (line 4519)

    [128, 1576) 'share' (line 4516)

    [1712, 3480) 'table_list' (line 4445)

    [3616, 4128) 'frm_name'

    [4192, 4704) 'frm_name' <== Memory access at offset 4704 overflows this variable

HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork

      (longjmp and C++ exceptions *are* supported)

Thread T14 created by T0 here:

    #0 0x5646742f9295 in __interceptor_pthread_create (/test/UBASAN_MD010922-mariadb-10.11.0-linux-x86_64-dbg/bin/mariadbd+0x7e0f295)

    #1 0x5646744209d3 in create_thread_to_handle_connection(CONNECT*) /test/10.11_dbg_san/sql/mysqld.cc:6018

    #2 0x564674432d12 in create_new_thread(CONNECT*) /test/10.11_dbg_san/sql/mysqld.cc:6077

    #3 0x564674433660 in handle_accepted_socket(st_mysql_socket, st_mysql_socket) /test/10.11_dbg_san/sql/mysqld.cc:6139

    #4 0x564674434aef in handle_connections_sockets() /test/10.11_dbg_san/sql/mysqld.cc:6263

    #5 0x564674439463 in mysqld_main(int, char**) /test/10.11_dbg_san/sql/mysqld.cc:5913

    #6 0x56467440d81a in main /test/10.11_dbg_san/sql/main.cc:34

    #7 0x152ef28aa082 in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: stack-buffer-overflow /test/10.11_dbg_san/strings/strxmov.c:53 in strxmov

Shadow bytes around the buggy address:

  0x02a65a0b5a50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5a60: f2 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00

  0x02a65a0b5a70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5a90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x02a65a0b5aa0: 00 00 00 00 00 00 00 00[f3]f3 f3 f3 f3 f3 f3 f3

  0x02a65a0b5ab0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5ad0: f1 f1 f1 f1 00 00 00 f2 f2 f2 00 00 f2 f2 00 00

  0x02a65a0b5ae0: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x02a65a0b5af0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

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

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  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

  Shadow gap:              cc

Compiled with GCC >=7.5.0 (I use GCC 9.4.0) and:

    -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_UBSAN=ON -DWITH_RAPID=OFF -DWSREP_LIB_WITH_ASAN=ON

Set before execution:

    export ASAN_OPTIONS=quarantine_size_mb=512:atexit=1:detect_invalid_pointer_pairs=3:dump_instruction_bytes=1:abort_on_error=1