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linux: new slots for non-existent capabilities only

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Prevent allocation of new cap-space slots each time a capability is
received by checking if the received capability already exists.

Fixes #2885
This commit is contained in:
Christian Prochaska 2018-06-26 12:01:44 +02:00 committed by Norman Feske
parent 46241da795
commit 25b47758b7
1 changed files with 14 additions and 2 deletions
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16
repos/base-linux/src/lib/base/ipc.cc
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@ -301,8 +301,20 @@ static void extract_sds_from_message(unsigned start_index,
int const associated_sd = Genode::ep_sd_registry()->try_associate(sd, id);
buf.insert(Capability_space::import(Rpc_destination(associated_sd),
Rpc_obj_key(badge)));
Native_capability arg_cap = Capability_space::lookup(Rpc_obj_key(badge));
if (arg_cap.valid()) {
/*
* Discard the received selector and keep using the already
* present one.
*/
buf.insert(arg_cap);
} else {
buf.insert(Capability_space::import(Rpc_destination(associated_sd),
Rpc_obj_key(badge)));
}
if ((associated_sd >= 0) && (associated_sd != sd)) {