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Bug#56761 Segfault on CHECKSUM TABLE performance_schema.EVENTS_WAITS_HISTORY EXTENDED

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Before this fix, the server could crash inside a memcpy when reading data
from the EVENTS_WAITS_CURRENT / HISTORY / HISTORY_LONG  tables.

The root cause is that the length used in a memcpy could be corrupted,
when another thread writes data in the wait record being read.
Reading unsafe data is ok, per design choice, and the code does sanitize
the data in general, but did not sanitize the length given to memcpy.

The fix is to also sanitize the schema name / object name / file name
length when extracting the data to produce a row.
This commit is contained in:
Marc Alff
2010-09-15 12:20:48 -06:00
parent 77844bd10b
commit 623863fdc7
4 changed files with 112 additions and 8 deletions
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34
mysql-test/suite/perfschema/r/checksum.result Normal file
View File

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checksum table performance_schema.COND_INSTANCES;
checksum table performance_schema.EVENTS_WAITS_CURRENT;
checksum table performance_schema.EVENTS_WAITS_HISTORY;
checksum table performance_schema.EVENTS_WAITS_HISTORY_LONG;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_BY_INSTANCE;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_BY_THREAD_BY_EVENT_NAME;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_GLOBAL_BY_EVENT_NAME;
checksum table performance_schema.FILE_INSTANCES;
checksum table performance_schema.FILE_SUMMARY_BY_EVENT_NAME;
checksum table performance_schema.FILE_SUMMARY_BY_INSTANCE;
checksum table performance_schema.MUTEX_INSTANCES;
checksum table performance_schema.PERFORMANCE_TIMERS;
checksum table performance_schema.RWLOCK_INSTANCES;
checksum table performance_schema.SETUP_CONSUMERS;
checksum table performance_schema.SETUP_INSTRUMENTS;
checksum table performance_schema.SETUP_TIMERS;
checksum table performance_schema.THREADS;
checksum table performance_schema.COND_INSTANCES extended;
checksum table performance_schema.EVENTS_WAITS_CURRENT extended;
checksum table performance_schema.EVENTS_WAITS_HISTORY extended;
checksum table performance_schema.EVENTS_WAITS_HISTORY_LONG extended;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_BY_INSTANCE extended;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_BY_THREAD_BY_EVENT_NAME extended;
checksum table performance_schema.EVENTS_WAITS_SUMMARY_GLOBAL_BY_EVENT_NAME extended;
checksum table performance_schema.FILE_INSTANCES extended;
checksum table performance_schema.FILE_SUMMARY_BY_EVENT_NAME extended;
checksum table performance_schema.FILE_SUMMARY_BY_INSTANCE extended;
checksum table performance_schema.MUTEX_INSTANCES extended;
checksum table performance_schema.PERFORMANCE_TIMERS extended;
checksum table performance_schema.RWLOCK_INSTANCES extended;
checksum table performance_schema.SETUP_CONSUMERS extended;
checksum table performance_schema.SETUP_INSTRUMENTS extended;
checksum table performance_schema.SETUP_TIMERS extended;
checksum table performance_schema.THREADS extended;