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MDEV-30453 Setting innodb_buffer_pool_filename to an empty string attempts to delete the data directory on shutdown

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Let us make innodb_buffer_pool_filename a read-only variable
so that a malicious user cannot cause an important file to be
deleted on InnoDB shutdown. An attempt to delete a directory
will fail because it is not a regular file, but what if the
variable pointed to (say) ibdata1, ib_logfile0 or some *.ibd file?

It does not seem to make much sense for this parameter to be
configurable in the first place, but we will not change that in order
to avoid breaking compatibility.
This commit is contained in:
Marko Mäkelä
2023-03-29 16:49:10 +03:00
parent 03b4a2d6e5
commit a6780df49b
6 changed files with 6 additions and 90 deletions
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18
mysql-test/suite/innodb/t/innodb_sys_var_valgrind.test
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@ -25,24 +25,6 @@ select @@innodb_ft_server_stopword_table;
drop table user_stopword_1, user_stopword_2;
#Test innodb_buffer_pool_filename (global variable)
select @@innodb_buffer_pool_filename;
set @blah='hello';
set global innodb_buffer_pool_filename = @blah;
select @@innodb_buffer_pool_filename;
set global innodb_buffer_pool_filename="bye";
select @@innodb_buffer_pool_filename;
--error ER_WRONG_VALUE_FOR_VAR
set global innodb_buffer_pool_filename=NULL;
select @@innodb_buffer_pool_filename;
set global innodb_buffer_pool_filename=default;
select @@innodb_buffer_pool_filename;
#Test innodb_ft_aux_table (global variable)
CREATE TABLE t1 ( id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,
opening_line TEXT(500), author VARCHAR(200), title VARCHAR(200), FULLTEXT idx