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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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21
mysql-test/suite/innodb/r/innodb_sys_var_valgrind.result
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@@ -25,27 +25,6 @@ select @@innodb_ft_server_stopword_table;
@@innodb_ft_server_stopword_table
NULL
drop table user_stopword_1, user_stopword_2;
select @@innodb_buffer_pool_filename;
@@innodb_buffer_pool_filename
ib_buffer_pool
set @blah='hello';
set global innodb_buffer_pool_filename = @blah;
select @@innodb_buffer_pool_filename;
@@innodb_buffer_pool_filename
hello
set global innodb_buffer_pool_filename="bye";
select @@innodb_buffer_pool_filename;
@@innodb_buffer_pool_filename
bye
set global innodb_buffer_pool_filename=NULL;
ERROR 42000: Variable 'innodb_buffer_pool_filename' can't be set to the value of 'NULL'
select @@innodb_buffer_pool_filename;
@@innodb_buffer_pool_filename
bye
set global innodb_buffer_pool_filename=default;
select @@innodb_buffer_pool_filename;
@@innodb_buffer_pool_filename
ib_buffer_pool
CREATE TABLE t1 ( id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,
opening_line TEXT(500), author VARCHAR(200), title VARCHAR(200), FULLTEXT idx
(opening_line)) ENGINE=InnoDB;