mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 22:23:16 +00:00
66fbea127b
The following fixes partly solve the problems triggered by the noux stress test introduced by nfeske in issue #208. * The check whether a capability exists in the Cap_map, and its insertion, has to be done atomically * While removing a capability it is looked up in the Cap_map via its id, check whether the found capability pointer is the same like the looked up, otherwise the wrong capability gets freed * When a local capability is un- resp. marshalled, only the local pointer gets transfered, not the redundant capability id * Introduce several assertions and warnings to facilitate debugging
82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
/*
|
|
* \brief Fiasco.OC-specific supplements to the IPC framework
|
|
* \author Norman Feske
|
|
* \author Stefan Kalkowski
|
|
* \date 2010-01-27
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2010-2012 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__BASE__IPC_H_
|
|
#define _INCLUDE__BASE__IPC_H_
|
|
|
|
#include <base/ipc_generic.h>
|
|
#include <util/assert.h>
|
|
|
|
|
|
inline void Genode::Ipc_ostream::_marshal_capability(Genode::Native_capability const &cap)
|
|
{
|
|
using namespace Fiasco;
|
|
|
|
/* first transfer local capability value */
|
|
_write_to_buf(cap.local());
|
|
|
|
/* if it's a local capability we're done */
|
|
if (cap.local())
|
|
return;
|
|
|
|
if (cap.valid()) {
|
|
if (!l4_msgtag_label(l4_task_cap_valid(L4_BASE_TASK_CAP, cap.dst()))) {
|
|
_write_to_buf(0);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* transfer capability id */
|
|
_write_to_buf(cap.local_name());
|
|
|
|
/* only transfer kernel-capability if it's a valid one */
|
|
if (cap.valid())
|
|
_snd_msg->snd_append_cap_sel(cap.dst());
|
|
|
|
ASSERT(!cap.valid() ||
|
|
l4_msgtag_label(l4_task_cap_valid(L4_BASE_TASK_CAP, cap.dst())),
|
|
"Send invalid cap");
|
|
}
|
|
|
|
|
|
inline void Genode::Ipc_istream::_unmarshal_capability(Genode::Native_capability &cap)
|
|
{
|
|
using namespace Fiasco;
|
|
|
|
long value = 0;
|
|
|
|
/* get local capability pointer from message buffer */
|
|
_read_from_buf(value);
|
|
|
|
/* if it's a local capability, the pointer is marshalled in the id */
|
|
if (value) {
|
|
cap = Capability<Native_capability>::local_cap((Native_capability*)value);
|
|
return;
|
|
}
|
|
|
|
/* extract capability id from message buffer */
|
|
_read_from_buf(value);
|
|
|
|
/* if id is zero an invalid capability was transfered */
|
|
if (!value) {
|
|
cap = Native_capability();
|
|
return;
|
|
}
|
|
|
|
/* try to insert received capability in the map and return it */
|
|
cap = Native_capability(cap_map()->insert_map(value, _rcv_msg->rcv_cap_sel()));
|
|
}
|
|
|
|
#endif /* _INCLUDE__BASE__IPC_H_ */
|