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Hudson commented on HBASE-11194: -------------------------------- SUCCESS: Integrated in HBase-0.98 #341 (See [https://builds.apache.org/job/HBase-0.98/341/]) HBASE-11194 [AccessController] issue with covering permission check in case of concurrent op on same row (Anoop) (anoopsamjohn: rev 6104fe767c542da8fd567928eaaae8a8674695cd) * hbase-server/src/main/java/org/apache/hadoop/hbase/security/access/AccessController.java * hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/TestCellACLWithMultipleVersions.java > [AccessController] issue with covering permission check in case of concurrent > op on same row > -------------------------------------------------------------------------------------------- > > Key: HBASE-11194 > URL: https://issues.apache.org/jira/browse/HBASE-11194 > Project: HBase > Issue Type: Bug > Components: security > Affects Versions: 0.98.0 > Reporter: Anoop Sam John > Assignee: Anoop Sam John > Fix For: 0.99.0, 0.98.4 > > Attachments: HBASE-11194.patch > > > The issue is the hook where we do check in which we have not acquired > rowlock. Take case of delete, we do the check in the preDelete() hook. We do > get the covering cells and check against their acls. At the point of the > preDelete hook, we have not acquired the row lock on the deleting row. > Consider 2 parallel threads one doing put and other delete both dealing with > same row. > Thread 1 acquired the rowlock and decided the TS (HRS time) and doing the > memstore write and HLog sync but the mvcc read point is NOT advanced. > Thread 2 at same time, doing the delete of the row (Say with latest TS . The > intent is to delete entire row) and in place of preDelete hook. There is no > row locking happening at this point. As part of covering permission check, it > doing a Get. But as said above, the put is not complete and the mvcc advance > has not happened. So the Get won’t return the new cell. It will return the > old cells. And the check pass for the old cells. Now suppose the new cell > ACL is not matching for the deleting user. But the cell was not read, the > check has not happened. So the ACL check will allow the user to delete > row.. The flow later comes to HRegion#doMiniBatchMutate() and try acquire > row lock and by that time the Thread 1 op was over. So it will get lock and > will add the delete tombstone. As a result the cell, for which the deleting > user has no acl right, also will get deleted. -- This message was sent by Atlassian JIRA (v6.2#6252)