diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index a83f535..019b64a 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -3273,8 +3273,21 @@
                 snapuserd_client_ = nullptr;
             }
         } else {
-            status.set_userspace_snapshots(!IsDmSnapshotTestingEnabled());
-            if (IsDmSnapshotTestingEnabled()) {
+            bool userSnapshotsEnabled = true;
+            const std::string UNKNOWN = "unknown";
+            const std::string vendor_release = android::base::GetProperty(
+                    "ro.vendor.build.version.release_or_codename", UNKNOWN);
+
+            // No user-space snapshots if vendor partition is on Android 12
+            if (vendor_release.find("12") != std::string::npos) {
+                LOG(INFO) << "Userspace snapshots disabled as vendor partition is on Android: "
+                          << vendor_release;
+                userSnapshotsEnabled = false;
+            }
+
+            userSnapshotsEnabled = (userSnapshotsEnabled && !IsDmSnapshotTestingEnabled());
+            status.set_userspace_snapshots(userSnapshotsEnabled);
+            if (!userSnapshotsEnabled) {
                 is_snapshot_userspace_ = false;
                 LOG(INFO) << "User-space snapshots disabled for testing";
             } else {
diff --git a/fs_mgr/libsnapshot/snapshot_test.cpp b/fs_mgr/libsnapshot/snapshot_test.cpp
index 36abf71..6a348b4 100644
--- a/fs_mgr/libsnapshot/snapshot_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_test.cpp
@@ -91,7 +91,7 @@
 
 void MountMetadata();
 bool ShouldUseCompression();
-bool ShouldUseUserspaceSnapshots();
+bool IsDaemonRequired();
 
 class SnapshotTest : public ::testing::Test {
   public:
@@ -1208,7 +1208,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), ShouldUseUserspaceSnapshots());
+    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
     {
         // We should have started in SECOND_PHASE since nothing shrinks.
         ASSERT_TRUE(AcquireLock());
@@ -1342,7 +1342,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), ShouldUseUserspaceSnapshots());
+    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
     {
         // Check that the merge phase is FIRST_PHASE until at least one call
         // to ProcessUpdateState() occurs.
@@ -1450,7 +1450,7 @@
 
     // Initiate the merge and wait for it to be completed.
     ASSERT_TRUE(init->InitiateMerge());
-    ASSERT_EQ(init->IsSnapuserdRequired(), ShouldUseUserspaceSnapshots());
+    ASSERT_EQ(init->IsSnapuserdRequired(), IsDaemonRequired());
     {
         // Check that the merge phase is FIRST_PHASE until at least one call
         // to ProcessUpdateState() occurs.
@@ -2750,13 +2750,26 @@
     }
 }
 
-bool ShouldUseUserspaceSnapshots() {
+bool IsDaemonRequired() {
     if (FLAGS_force_config == "dmsnap") {
         return false;
     }
+
+    const std::string UNKNOWN = "unknown";
+    const std::string vendor_release =
+            android::base::GetProperty("ro.vendor.build.version.release_or_codename", UNKNOWN);
+
+    // No userspace snapshots if vendor partition is on Android 12
+    // However, for GRF devices, snapuserd daemon will be on
+    // vendor ramdisk in Android 12.
+    if (vendor_release.find("12") != std::string::npos) {
+        return true;
+    }
+
     if (!FLAGS_force_config.empty()) {
         return true;
     }
+
     return IsUserspaceSnapshotsEnabled();
 }
 
diff --git a/trusty/keymaster/TrustyKeymaster.cpp b/trusty/keymaster/TrustyKeymaster.cpp
index cdfbd90..e77940a 100644
--- a/trusty/keymaster/TrustyKeymaster.cpp
+++ b/trusty/keymaster/TrustyKeymaster.cpp
@@ -279,4 +279,10 @@
     return response;
 }
 
+GetRootOfTrustResponse TrustyKeymaster::GetRootOfTrust(const GetRootOfTrustRequest& request) {
+    GetRootOfTrustResponse response(message_version());
+    ForwardCommand(KM_GET_ROOT_OF_TRUST, request, &response);
+    return response;
+}
+
 }  // namespace keymaster
diff --git a/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
index f80e02f..9f4f39b 100644
--- a/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
+++ b/trusty/keymaster/include/trusty_keymaster/TrustyKeymaster.h
@@ -66,6 +66,7 @@
     DeviceLockedResponse DeviceLocked(const DeviceLockedRequest& request);
     ConfigureVendorPatchlevelResponse ConfigureVendorPatchlevel(
             const ConfigureVendorPatchlevelRequest& request);
+    GetRootOfTrustResponse GetRootOfTrust(const GetRootOfTrustRequest& request);
 
     uint32_t message_version() const { return message_version_; }
 
diff --git a/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h b/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
index fa475ae..bf0cb70 100644
--- a/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
+++ b/trusty/keymaster/include/trusty_keymaster/ipc/keymaster_ipc.h
@@ -59,6 +59,7 @@
     KM_GENERATE_RKP_KEY             = (31 << KEYMASTER_REQ_SHIFT),
     KM_GENERATE_CSR                 = (32 << KEYMASTER_REQ_SHIFT),
     KM_CONFIGURE_VENDOR_PATCHLEVEL  = (33 << KEYMASTER_REQ_SHIFT),
+    KM_GET_ROOT_OF_TRUST            = (34 << KEYMASTER_REQ_SHIFT),
 
     // Bootloader/provisioning calls.
     KM_SET_BOOT_PARAMS = (0x1000 << KEYMASTER_REQ_SHIFT),
diff --git a/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp b/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
index 44780e8..7d58162 100644
--- a/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
+++ b/trusty/keymaster/keymint/TrustyKeyMintDevice.cpp
@@ -325,9 +325,20 @@
     return kmError2ScopedAStatus(KM_ERROR_UNIMPLEMENTED);
 }
 
-ScopedAStatus TrustyKeyMintDevice::getRootOfTrust(const array<uint8_t, 16>& /* challenge */,
-                                                  vector<uint8_t>* /* rootOfTrust */) {
-    return kmError2ScopedAStatus(KM_ERROR_UNIMPLEMENTED);
+ScopedAStatus TrustyKeyMintDevice::getRootOfTrust(const array<uint8_t, 16>& challenge,
+                                                  vector<uint8_t>* rootOfTrust) {
+    if (!rootOfTrust) {
+        return kmError2ScopedAStatus(KM_ERROR_UNEXPECTED_NULL_POINTER);
+    }
+    keymaster::GetRootOfTrustRequest request(impl_->message_version(),
+                                             {challenge.begin(), challenge.end()});
+    keymaster::GetRootOfTrustResponse response = impl_->GetRootOfTrust(request);
+    if (response.error != KM_ERROR_OK) {
+        return kmError2ScopedAStatus(response.error);
+    }
+
+    *rootOfTrust = std::move(response.rootOfTrust);
+    return ScopedAStatus::ok();
 }
 
 ScopedAStatus TrustyKeyMintDevice::sendRootOfTrust(const vector<uint8_t>& /* rootOfTrust */) {