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When running mysqlbinlog on a 64-bit machine with a corrupt relay log, it causes mysqlbinlog to crash. In this case, the crash is caused because a request for 18446744073709534806U bytes is issued, which apparantly can be served on a 64-bit machine (speculatively, I assume) but this causes the memcpy() issued later to copy the data to segfault. The request for the number of bytes is caused by a computation of data_len - server_vars_len where server_vars_len is corrupt in such a sense that it is > data_len. This causes a wrap-around, with the the data_len given above. This patch adds a check that if server_vars_len is greater than data_len before the substraction, and aborts reading the event in that case marking the event as invalid. It also adds checks to see that reading the server variables does not go outside the bounds of the available space, giving a limited amount of integrity check. mysql-test/r/mysqlbinlog.result: Result change. mysql-test/t/mysqlbinlog.test: Adding test that it fails gracefully for a corrupt relay log. sql/log_event.cc: Adding check that status var length does not cause wrap-around when performing subtraction. Extending get_str_len_and_pointer() to check that the string can actually be read without reading outside bounds. Adding checks when reading server variables from the Query- log_event so that the variable can really be read. Abort reading and mark the event as invalid otherwise. mysql-test/std_data/corrupt-relay-bin.000624: BitKeeper file /home/mats/devel/b31793-mysql-5.0-rpl/mysql-test/std_data/corrupt-relay-bin.000624 |
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.. | ||
include | ||
lib | ||
misc | ||
ndb | ||
r | ||
std_data | ||
suite | ||
t | ||
create-test-result | ||
fix-result | ||
install_test_db.sh | ||
Makefile.am | ||
mysql-stress-test.pl | ||
mysql-test-run-shell.sh | ||
mysql-test-run.pl | ||
purify.supp | ||
README | ||
README.gcov | ||
README.stress | ||
resolve-stack | ||
valgrind.supp |
This directory contains a test suite for the MySQL daemon. To run the currently existing test cases, simply execute ./mysql-test-run in this directory. It will fire up the newly built mysqld and test it. Note that you do not have to have to do "make install", and you could actually have a co-existing MySQL installation. The tests will not conflict with it. All tests must pass. If one or more of them fail on your system, please read the following manual section for instructions on how to report the problem: http://dev.mysql.com/doc/mysql/en/mysql-test-suite.html If you want to use an already running MySQL server for specific tests, use the --extern option to mysql-test-run. Please note that in this mode, the test suite expects you to provide the names of the tests to run. For example, here is the command to run the "alias" and "analyze" tests with an external server: mysql-test-run --extern alias analyze To match your setup, you might also need to provide --socket, --user, and other relevant options. With no test cases named on the command line, mysql-test-run falls back to the normal "non-extern" behavior. The reason for this is that some tests cannot run with an external server. You can create your own test cases. To create a test case, create a new file in the t subdirectory using a text editor. The file should have a .test extension. For example: xemacs t/test_case_name.test In the file, put a set of SQL statements that create some tables, load test data, and run some queries to manipulate it. We would appreciate it if you name your test tables t1, t2, t3 ... (to not conflict too much with existing tables). Your test should begin by dropping the tables you are going to create and end by dropping them again. This ensures that you can run the test over and over again. If you are using mysqltest commands (like result file names) in your test case, you should create the result file as follows: mysql-test-run --record test_case_name or mysqltest --record < t/test_case_name.test If you only have a simple test cases consisting of SQL statements and comments, you can create the test case in one of the following ways: mysql-test-run --record test_case_name mysql test < t/test_case_name.test > r/test_case_name.result mysqltest --record --record-file=r/test_case_name.result < t/test_case_name.test When this is done, take a look at r/test_case_name.result - If the result is incorrect, you have found a bug. In this case, you should edit the test result to the correct results so that we can verify that the bug is corrected in future releases. To submit your test case, put your .test file and .result file(s) into a tar.gz archive, add a README that explains the problem, ftp the archive to ftp://support.mysql.com/pub/mysql/secret/ and send a mail to bugs@lists.mysql.com