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loader,nit_fb,wm: work-around for NOVA's cap revokes

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This commit is contained in:
Norman Feske 2016-01-29 10:36:33 +01:00
parent d198f07890
commit 2936cbebfd
3 changed files with 25 additions and 0 deletions
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7
repos/gems/src/server/wm/decorator_nitpicker.h
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@ -163,6 +163,8 @@ struct Wm::Decorator_nitpicker_session : Genode::Rpc_object<Nitpicker::Session>,
Nitpicker::Connection _nitpicker_session { "decorator" };
Genode::Signal_context_capability _mode_sigh;
typedef Nitpicker::Session::Command_buffer Command_buffer;
Attached_ram_dataspace _command_ds { &_ram, sizeof(Command_buffer) };
@ -442,6 +444,11 @@ struct Wm::Decorator_nitpicker_session : Genode::Rpc_object<Nitpicker::Session>,
void mode_sigh(Genode::Signal_context_capability sigh) override
{
/*
* Remember signal-context capability to keep NOVA from revoking
* transitive delegations of the capability.
*/
_mode_sigh = sigh;
_nitpicker_session.mode_sigh(sigh);
}

8
repos/os/src/server/loader/input.h
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@ -43,6 +43,8 @@ class Input::Session_component : public Rpc_object<Session>
Motion_delta &_motion_delta;
Event * const _ev_buf;
Genode::Signal_context_capability _sigh;
public:
/**
@ -99,6 +101,12 @@ class Input::Session_component : public Rpc_object<Session>
void sigh(Signal_context_capability sigh) override
{
/*
* Maintain local copy of signal-context capability to keep
* NOVA from flushing transitive delegations of the capability.
*/
_sigh = sigh;
_real_input.sigh(sigh);
}
};

10
repos/os/src/server/nit_fb/main.cc
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@ -113,6 +113,8 @@ struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
Genode::Signal_context_capability _mode_sigh;
Genode::Signal_context_capability _sync_sigh;
View_updater &_view_updater;
Framebuffer::Mode::Format _format = _nitpicker.mode().format();
@ -204,6 +206,14 @@ struct Framebuffer::Session_component : Genode::Rpc_object<Framebuffer::Session>
void sync_sigh(Genode::Signal_context_capability sigh) override
{
/*
* Keep a component-local copy of the signal capability. Otherwise,
* NOVA would revoke the capability from further recipients (in this
* case the nitpicker instance we are using) once we revoke the
* capability locally.
*/
_sync_sigh = sigh;
_nit_fb.sync_sigh(sigh);
}
};