Haohui Mai created HDFS-5923:
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Summary: Do not persist the ACL bit in the FsPermission
Key: HDFS-5923
URL: https://issues.apache.org/jira/browse/HDFS-5923
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Haohui Mai
Assignee: Haohui Mai
The current implementation persists and ACL bit in FSImage and editlogs.
Moreover, the security decisions also depend on whether the bit is set.
The problem here is that we have to maintain the implicit invariant, which is
the ACL bit is set if and only if the the inode has AclFeature. The invariant
has to be maintained everywhere otherwise it can lead to a security
vulnerability. In the worst case, an attacker can toggle the bit and bypass the
ACL checks.
The jira proposes to treat the ACL bit as a transient bit. The bit should not
be persisted onto the disk, neither it should affect any security decisions.
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