diff --git a/contexthub/1.2/IContexthub.hal b/contexthub/1.2/IContexthub.hal
index 3488b74..4bb9361 100644
--- a/contexthub/1.2/IContexthub.hal
+++ b/contexthub/1.2/IContexthub.hal
@@ -16,6 +16,7 @@
 
 package android.hardware.contexthub@1.2;
 
+import @1.0::ContextHub;
 import @1.0::Result;
 import @1.1::IContexthub;
 import @1.1::SettingValue;
@@ -23,6 +24,17 @@
 
 interface IContexthub extends @1.1::IContexthub {
     /**
+     * Enumerate all available context hubs on the system.
+     *
+     * @return hubs                 list of hubs on this system.
+     * @return supportedPermissions list of Android permissions all hubs
+     *                              support for nanoapps to enforce host
+     *                              endpoints are granted in order to
+     *                              communicate with them.
+     */
+    getHubs_1_2() generates (vec<ContextHub> hubs, vec<string> supportedPermissions);
+
+    /**
      * Register a callback for the HAL implementation to send asynchronous
      * messages to the service from a context hub. There can be a maximum of
      * one callback registered with the HAL. A call to this function when a
diff --git a/contexthub/1.2/IContexthubCallback.hal b/contexthub/1.2/IContexthubCallback.hal
index 0236160..1a40512 100644
--- a/contexthub/1.2/IContexthubCallback.hal
+++ b/contexthub/1.2/IContexthubCallback.hal
@@ -24,10 +24,18 @@
      * implementation to allow the HAL to send asynchronous messages back
      * to the service and registered clients of the ContextHub service.
      *
-     * @param msg message that should be delivered to host app clients
-     *
+     * @param msg             message that should be delivered to host app
+     *                        clients
+     * @param msgContentPerms list of Android permissions that cover the
+     *                        contents of the message being sent from the app.
+     *                        This is different from the permissions stored
+     *                        inside of ContextHubMsg in that these must be a
+     *                        subset of those permissions and are meant to
+     *                        assist in properly attributing the message
+     *                        contents when delivering to a ContextHub service
+     *                        client.
      */
-    handleClientMsg_1_2(ContextHubMsg msg);
+    handleClientMsg_1_2(ContextHubMsg msg, vec<string> msgContentPerms);
 
     /**
      * This callback is passed by the Contexthub service to the HAL
diff --git a/contexthub/1.2/default/Contexthub.cpp b/contexthub/1.2/default/Contexthub.cpp
index db0c5bc..601eccd 100644
--- a/contexthub/1.2/default/Contexthub.cpp
+++ b/contexthub/1.2/default/Contexthub.cpp
@@ -23,10 +23,36 @@
 namespace V1_2 {
 namespace implementation {
 
+using ::android::hardware::hidl_string;
 using ::android::hardware::contexthub::V1_0::Result;
 using ::android::hardware::contexthub::V1_X::implementation::IContextHubCallbackWrapperV1_0;
 using ::android::hardware::contexthub::V1_X::implementation::IContextHubCallbackWrapperV1_2;
 
+Return<void> Contexthub::getHubs_1_2(getHubs_1_2_cb _hidl_cb) {
+    ::android::hardware::contexthub::V1_0::ContextHub hub = {};
+    hub.name = "Mock Context Hub";
+    hub.vendor = "AOSP";
+    hub.toolchain = "n/a";
+    hub.platformVersion = 1;
+    hub.toolchainVersion = 1;
+    hub.hubId = kMockHubId;
+    hub.peakMips = 1;
+    hub.peakPowerDrawMw = 1;
+    hub.maxSupportedMsgLen = 4096;
+    hub.chrePlatformId = UINT64_C(0x476f6f6754000000);
+    hub.chreApiMajorVersion = 1;
+    hub.chreApiMinorVersion = 4;
+
+    // Report a single mock hub
+    std::vector<::android::hardware::contexthub::V1_0::ContextHub> hubs;
+    hubs.push_back(hub);
+
+    std::vector<hidl_string> hubPermissionList;
+
+    _hidl_cb(hubs, hubPermissionList);
+    return Void();
+}
+
 Return<Result> Contexthub::registerCallback(uint32_t hubId,
                                             const sp<V1_0::IContexthubCallback>& cb) {
     if (hubId == kMockHubId) {
diff --git a/contexthub/1.2/default/Contexthub.h b/contexthub/1.2/default/Contexthub.h
index 8b89824..32b862d 100644
--- a/contexthub/1.2/default/Contexthub.h
+++ b/contexthub/1.2/default/Contexthub.h
@@ -35,6 +35,7 @@
     using Result = ::android::hardware::contexthub::V1_0::Result;
     using SettingValue = ::android::hardware::contexthub::V1_1::SettingValue;
     using SettingV1_1 = ::android::hardware::contexthub::V1_1::Setting;
+    using getHubs_1_2_cb = ::android::hardware::contexthub::V1_2::IContexthub::getHubs_1_2_cb;
 
   public:
     // Methods from V1_0::IContexthub
@@ -47,6 +48,8 @@
     Return<void> onSettingChanged(SettingV1_1 setting, SettingValue newValue) override;
 
     // Methods from V1_2::IContexthub
+    Return<void> getHubs_1_2(getHubs_1_2_cb _hidl_cb) override;
+
     Return<void> onSettingChanged_1_2(Setting setting, SettingValue newValue) override;
 
     Return<Result> registerCallback_1_2(uint32_t hubId,
diff --git a/contexthub/common/default/1.X/utils/IContextHubCallbackWrapper.h b/contexthub/common/default/1.X/utils/IContextHubCallbackWrapper.h
index df78438..d8cc37b 100644
--- a/contexthub/common/default/1.X/utils/IContextHubCallbackWrapper.h
+++ b/contexthub/common/default/1.X/utils/IContextHubCallbackWrapper.h
@@ -54,7 +54,8 @@
  */
 class IContextHubCallbackWrapperBase : public VirtualLightRefBase {
   public:
-    virtual Return<void> handleClientMsg(V1_2::ContextHubMsg msg) = 0;
+    virtual Return<void> handleClientMsg(V1_2::ContextHubMsg msg,
+                                         hidl_vec<hidl_string> msgContentPerms) = 0;
 
     virtual Return<void> handleTxnResult(uint32_t txnId, V1_0::TransactionResult result) = 0;
 
@@ -70,7 +71,8 @@
   public:
     ContextHubCallbackWrapper(sp<T> callback) : mCallback(callback){};
 
-    virtual Return<void> handleClientMsg(V1_2::ContextHubMsg msg) override {
+    virtual Return<void> handleClientMsg(V1_2::ContextHubMsg msg,
+                                         hidl_vec<hidl_string> /* msgContentPerms */) override {
         return mCallback->handleClientMsg(convertToOldMsg(msg));
     }
 
@@ -105,8 +107,9 @@
     IContextHubCallbackWrapperV1_2(sp<V1_2::IContexthubCallback> callback)
         : ContextHubCallbackWrapper(callback){};
 
-    Return<void> handleClientMsg(V1_2::ContextHubMsg msg) override {
-        return mCallback->handleClientMsg_1_2(msg);
+    Return<void> handleClientMsg(V1_2::ContextHubMsg msg,
+                                 hidl_vec<hidl_string> msgContentPerms) override {
+        return mCallback->handleClientMsg_1_2(msg, msgContentPerms);
     }
 
     Return<void> handleAppsInfo(hidl_vec<V1_2::HubAppInfo> appInfo) override {