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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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3
mysql-test/suite/innodb/r/innodb_buffer_pool_dump_pct.result
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@ -2,13 +2,11 @@ CREATE TABLE tab5 (col1 int auto_increment primary key,
col2 VARCHAR(25), col3 varchar(25)) ENGINE=InnoDB;
CREATE INDEX idx1 ON tab5(col2(10));
CREATE INDEX idx2 ON tab5(col3(10));
SET GLOBAL innodb_buffer_pool_filename=ib_buffer_pool100;
SET GLOBAL innodb_buffer_pool_dump_pct=100;
SELECT variable_value INTO @IBPDS
FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_DUMP_STATUS';
SET GLOBAL innodb_buffer_pool_dump_now=ON;
SET GLOBAL innodb_buffer_pool_filename=ib_buffer_pool1;
SET GLOBAL innodb_buffer_pool_dump_pct=1;
SELECT @@global.innodb_buffer_pool_dump_pct;
@@global.innodb_buffer_pool_dump_pct
@ -18,5 +16,4 @@ FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_DUMP_STATUS';
SET GLOBAL innodb_buffer_pool_dump_now=ON;
SET GLOBAL innodb_buffer_pool_dump_pct=DEFAULT;
SET GLOBAL innodb_buffer_pool_filename=DEFAULT;
DROP TABLE tab5;