fix(el3-spm): improve direct messaging validation
Perform additional validation of the source and destination
IDs of direct messages.
Additionally track the sender of a direct request to allow
validating the target of the corresponding direct response.
Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: I8d39d53a02b8333246f1500c79ba04f149459c16
diff --git a/services/std_svc/spm/el3_spmc/spmc_pm.c b/services/std_svc/spm/el3_spmc/spmc_pm.c
index d25344c..c7e864f 100644
--- a/services/std_svc/spm/el3_spmc/spmc_pm.c
+++ b/services/std_svc/spm/el3_spmc/spmc_pm.c
@@ -83,6 +83,7 @@
/* Update the runtime model and state of the partition. */
ec->rt_model = RT_MODEL_INIT;
ec->rt_state = RT_STATE_RUNNING;
+ ec->dir_req_origin_id = INV_SP_ID;
INFO("SP (0x%x) init start on core%u.\n", sp->sp_id, linear_id);
@@ -132,6 +133,7 @@
/* Update the runtime model and state of the partition. */
ec->rt_model = RT_MODEL_DIR_REQ;
ec->rt_state = RT_STATE_RUNNING;
+ ec->dir_req_origin_id = FFA_SPMC_ID;
rc = spmc_sp_synchronous_entry(ec);
if (rc != 0ULL) {