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Moved the implementation in SystemServer/Service.cpp to LibCore.
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A malicious caller can create a SocketAddress for a local unix socket with an
over-long name that does not fit into struct sock_addr_un.
- Socket::connet: This caused the 'sun_path' field to
overflow, probably overwriting the return pointer of the call frame, and thus
crashing the process (in the best case).
- SocketAddress::to_sockaddr_un: This triggered a RELEASE_ASSERT, and thus
crashing the process.
Both have been fixed to return a nice error code instead of crashing.
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dup2(fd, fd) will no longer clear CLOEXEC on the descriptor.
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You can now ask SystemServer to not only listen for connections on the socket,
but to actually accept them, and to spawn an instance of the service for each
client connection. In this case, it's the accepted, not listening, socket that
the service processes will receive using socket takeover.
This mode obviously requires the service to be a multi-instance service.
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For this kind of services, there's no single PID of a running instance;
there may be multiple, or no instances of the service running at any time.
No keepalive functionality is available in this mode, since "alive" doesn't
make sense for multi-instance services.
At the moment, there's no way to actually create multiple instances of
a service; this is going to be added in the next commit.
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SystemServer will now look at the boot mode, as specified on the kernel command
line, and only launch the services configured for that boot mode.
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It didn't feel right to have a "DHCPClient" in a "Servers" directory.
Rename this to Services to better reflect the type of programs we'll
be putting in there.
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