[Zion] Remove all capabilities on process cleanup.

zion/capability/capability_table.cpp

@@ -33,3 +33,13 @@ glcr::RefPtr<Capability> CapabilityTable::ReleaseCapability(uint64_t id) {
   (void)capabilities_.Delete(id);
   return cap;
 }
+
+void CapabilityTable::ReleaseAll() {
+  for (uint64_t i = 0; i < next_cap_id_; i++) {
+    (void)capabilities_.Delete(i);
+  }
+  if (capabilities_.size() != 0) {
+    dbgln("Capabilities still remaining after clear: {x}",
+          capabilities_.size());
+  }
+}

zion/capability/capability_table.h

@@ -25,6 +25,8 @@ class CapabilityTable {
   glcr::RefPtr<Capability> GetCapability(uint64_t id);
   glcr::RefPtr<Capability> ReleaseCapability(uint64_t id);
 
+  void ReleaseAll();
+
  private:
   glcr::RefPtr<Mutex> lock_ = Mutex::Create();
   // TODO: Do some randomization.

zion/object/process.cpp

@@ -98,7 +98,8 @@ void Process::Cleanup() {
     }
   }
 
-  // 2. Release all capabailities. TODO
+  // 2. Release all capabailities.
+  caps_.ReleaseAll();
 
   // 3. Unmap all user memory. TODO