Zsombor Gegesy created HDFS-11924:
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Summary: FSPermissionChecker.checkTraverse doesn't pass FsAction
access properly
Key: HDFS-11924
URL: https://issues.apache.org/jira/browse/HDFS-11924
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Affects Versions: 2.8.0
Reporter: Zsombor Gegesy
Fix For: 2.8.1
In 2.7.1, during file access check, the AccessControlEnforcer is called with
the access parameter filled with FsAction values.
A thread dump in this case:
{code}
FSPermissionChecker.checkPermission(INodesInPath, boolean, FsAction,
FsAction, FsAction, FsAction, boolean) line: 189
FSDirectory.checkPermission(FSPermissionChecker, INodesInPath, boolean,
FsAction, FsAction, FsAction, FsAction, boolean) line: 1698
FSDirectory.checkPermission(FSPermissionChecker, INodesInPath, boolean,
FsAction, FsAction, FsAction, FsAction) line: 1682
FSDirectory.checkPathAccess(FSPermissionChecker, INodesInPath,
FsAction) line: 1656
FSNamesystem.appendFileInternal(FSPermissionChecker, INodesInPath,
String, String, boolean, boolean) line: 2668
FSNamesystem.appendFileInt(String, String, String, boolean, boolean)
line: 2985
FSNamesystem.appendFile(String, String, String, EnumSet<CreateFlag>,
boolean) line: 2952
NameNodeRpcServer.append(String, String, EnumSetWritable<CreateFlag>)
line: 653
ClientNamenodeProtocolServerSideTranslatorPB.append(RpcController,
ClientNamenodeProtocolProtos$AppendRequestProto) line: 421
ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(Descriptors$MethodDescriptor,
RpcController, Message) line: not available
ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(RPC$Server, String,
Writable, long) line: 616
ProtobufRpcEngine$Server(RPC$Server).call(RPC$RpcKind, String,
Writable, long) line: 969
Server$Handler$1.run() line: 2049
Server$Handler$1.run() line: 2045
AccessController.doPrivileged(PrivilegedExceptionAction<T>,
AccessControlContext) line: not available [native method]
Subject.doAs(Subject, PrivilegedExceptionAction<T>) line: 422
UserGroupInformation.doAs(PrivilegedExceptionAction<T>) line: 1657
{code}
However, in 2.8.0 this value is changed to null, because in
FSPermissionChecker.checkTraverse(FSPermissionChecker pc, INodesInPath iip,
boolean resolveLink) couldn't pass the required information, so it's simply use
'null'.
This is a regression between 2.7.1 and 2.8.0, because external
AccessControlEnforcer couldn't work properly
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