Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.2.0
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None
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Sony Xperia 1 III variant of Android 11
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Android
Description
With https://codereview.qt-project.org/c/qt/qtremoteobjects/+/366916 support for abstract local sockets was added to QtRO for Linux platforms to help with cases where the file system is read-only.
Though it seems this still doesn't work on "mainstream" distributions of Android (tested on a Sony variant of Android 11, Xperia 1 III).
Looking at the log output from remote objects I can see that listening on the server succeeds but attempting to connect to it from the client is faced with a SocketAccessError.
# Server side
09-20 14:54:28.477 32668 32698 D qt.remoteobjects: : QRemoteObjectSourceIo is Listening QUrl("localabstract:replica")
09-20 14:54:28.477 32668 32698 D qt.remoteobjects: : Connection made 0 5 "messageFromService"
09-20 14:54:28.477 32668 32698 D qt.remoteobjects: : Registering "QtAndroidService"
###
# Client side
09-20 14:54:30.462 410 470 D libserviceremoteobjectsclient_arm64-v8a.so: Start remote object client
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Opening connection to "localabstract:replica"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Replica Connection isValid false
09-20 14:54:30.462 410 470 D qt.remoteobjects: : onError QLocalSocket::SocketAccessError "replica"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Starting setReplicaImplementation for "QtAndroidService"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : void qt::QRemoteObjectNodePrivate::openConnectionIfNeeded(const qt::QString &) "QtAndroidService" 0xb4000072570b2510
09-20 14:54:30.462 410 470 D qt.remoteobjects: : "QtAndroidService" not available - available addresses: QHash()
09-20 14:54:30.462 410 470 D qt.remoteobjects: : configurePrivate starting for "QtAndroidService"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Rep connect 5 true "initialized"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Rep connect 6 true "notified"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Rep connect 7 true "stateChanged"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : Connect 8 true "messageFromService"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : "configurePrivate finished, signalOffset = 8, methodOffset = 9, #Signals = 1"
09-20 14:54:30.462 410 470 D qt.remoteobjects: : setReplicaImplementation - Created new instance "QtAndroidService" QHash()
[...]
09-20 14:54:30.458 410 410 W qtMainLoopThrea: type=1400 audit(0.0:76210): avc: denied { connectto } for path=007265706C696361 scontext=u:r:untrusted_app:s0:c237,c257,c512,c768 tcontext=u:r:untrusted_app:s0:c238,c257,c512,c768 tclass=unix_stream_socket permissive=0 ppid=868 pcomm="main" pgid=410 pgcomm="tandroidservice" app=org.qtproject.example.qtandroidservice
Note the last line from the client! It's from SELinux saying we've been denied access to the connectto call!
An updated version of the serviceremoteobjects example from qtandroidextras is attached which works with Qt6.2.
# Configure with mkdir build && cd build && qmake ../serviceremoteobjects.pro # Build with make && make apk -j1
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