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https://issues.apache.org/jira/browse/HBASE-11194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-11194:
-----------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Committed to master and 0.98 branches. Thanks for the review Andy.
> [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.
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