diff --git a/cmds/idmap2/tests/R.h b/cmds/idmap2/tests/R.h
index aed263a..89b4346 100644
--- a/cmds/idmap2/tests/R.h
+++ b/cmds/idmap2/tests/R.h
@@ -41,16 +41,17 @@
     constexpr ResourceId not_overlayable = 0x7f020003;
     constexpr ResourceId other = 0x7f020004;
     constexpr ResourceId policy_actor = 0x7f020005;
-    constexpr ResourceId policy_odm = 0x7f020006;
-    constexpr ResourceId policy_oem = 0x7f020007;
-    constexpr ResourceId policy_product = 0x7f020008;
-    constexpr ResourceId policy_public = 0x7f020009;
-    constexpr ResourceId policy_signature = 0x7f02000a;
-    constexpr ResourceId policy_system = 0x7f02000b;
-    constexpr ResourceId policy_system_vendor = 0x7f02000c;
-    constexpr ResourceId str1 = 0x7f02000d;
-    constexpr ResourceId str3 = 0x7f02000f;
-    constexpr ResourceId str4 = 0x7f020010;
+    constexpr ResourceId policy_config_signature = 0x7f020006;
+    constexpr ResourceId policy_odm = 0x7f020007;
+    constexpr ResourceId policy_oem = 0x7f020008;
+    constexpr ResourceId policy_product = 0x7f020009;
+    constexpr ResourceId policy_public = 0x7f02000a;
+    constexpr ResourceId policy_signature = 0x7f02000b;
+    constexpr ResourceId policy_system = 0x7f02000c;
+    constexpr ResourceId policy_system_vendor = 0x7f02000d;
+    constexpr ResourceId str1 = 0x7f02000e;
+    constexpr ResourceId str3 = 0x7f020010;
+    constexpr ResourceId str4 = 0x7f020011;
 
     namespace literal {
       inline const std::string str1 = hexify(R::target::string::str1);
@@ -92,14 +93,15 @@
   constexpr ResourceId not_overlayable = 0x7f010000;
   constexpr ResourceId other = 0x7f010001;
   constexpr ResourceId policy_actor = 0x7f010002;
-  constexpr ResourceId policy_odm = 0x7f010003;
-  constexpr ResourceId policy_oem = 0x7f010004;
-  constexpr ResourceId policy_product = 0x7f010005;
-  constexpr ResourceId policy_public = 0x7f010006;
-  constexpr ResourceId policy_signature = 0x7f010007;
-  constexpr ResourceId policy_system = 0x7f010008;
-  constexpr ResourceId policy_system_vendor = 0x7f010009;
-};
+  constexpr ResourceId policy_config_signature = 0x7f010003;
+  constexpr ResourceId policy_odm = 0x7f010004;
+  constexpr ResourceId policy_oem = 0x7f010005;
+  constexpr ResourceId policy_product = 0x7f010006;
+  constexpr ResourceId policy_public = 0x7f010007;
+  constexpr ResourceId policy_signature = 0x7f010008;
+  constexpr ResourceId policy_system = 0x7f010009;
+  constexpr ResourceId policy_system_vendor = 0x7f01000a;
+}
 // clang-format on
 
 }  // namespace android::idmap2
diff --git a/cmds/idmap2/tests/ResourceMappingTests.cpp b/cmds/idmap2/tests/ResourceMappingTests.cpp
index de039f4..3ec6ac2 100644
--- a/cmds/idmap2/tests/ResourceMappingTests.cpp
+++ b/cmds/idmap2/tests/ResourceMappingTests.cpp
@@ -237,7 +237,7 @@
 
   ASSERT_TRUE(resources) << resources.GetErrorMessage();
   auto& res = *resources;
-  ASSERT_EQ(res.GetTargetToOverlayMap().size(), 10U);
+  ASSERT_EQ(res.GetTargetToOverlayMap().size(), 11U);
   ASSERT_RESULT(MappingExists(res, R::target::string::not_overlayable, Res_value::TYPE_REFERENCE,
                               R::system_overlay_invalid::string::not_overlayable,
                               false /* rewrite */));
@@ -256,6 +256,10 @@
   ASSERT_RESULT(MappingExists(res, R::target::string::policy_public, Res_value::TYPE_REFERENCE,
                               R::system_overlay_invalid::string::policy_public,
                               false /* rewrite */));
+  ASSERT_RESULT(MappingExists(res, R::target::string::policy_config_signature,
+                              Res_value::TYPE_REFERENCE,
+                              R::system_overlay_invalid::string::policy_config_signature,
+                              false /* rewrite */));
   ASSERT_RESULT(MappingExists(res, R::target::string::policy_signature, Res_value::TYPE_REFERENCE,
                               R::system_overlay_invalid::string::policy_signature,
                               false /* rewrite */));
@@ -298,8 +302,9 @@
   ASSERT_EQ(resources->GetTargetToOverlayMap().size(), 0U);
 }
 
-// Overlays that are pre-installed or are signed with the same signature as the target can overlay
-// packages that have not defined overlayable resources.
+// Overlays that are pre-installed or are signed with the same signature as the target  or are signed
+// with the same signature as the reference package can overlay packages that have not defined
+// overlayable resources.
 TEST(ResourceMappingTests, ResourcesFromApkAssetsDefaultPolicies) {
   auto CheckEntries = [&](const PolicyBitmask& fulfilled_policies) -> void {
     auto resources = TestGetResourceMapping("/target/target-no-overlayable.apk",
@@ -309,7 +314,7 @@
 
     ASSERT_TRUE(resources) << resources.GetErrorMessage();
     auto& res = *resources;
-    ASSERT_EQ(resources->GetTargetToOverlayMap().size(), 10U);
+    ASSERT_EQ(resources->GetTargetToOverlayMap().size(), 11U);
     ASSERT_RESULT(MappingExists(res, R::target::string::not_overlayable, Res_value::TYPE_REFERENCE,
                                 R::system_overlay_invalid::string::not_overlayable,
                                 false /* rewrite */));
@@ -330,6 +335,10 @@
     ASSERT_RESULT(MappingExists(res, R::target::string::policy_public, Res_value::TYPE_REFERENCE,
                                 R::system_overlay_invalid::string::policy_public,
                                 false /* rewrite */));
+    ASSERT_RESULT(MappingExists(res, R::target::string::policy_config_signature,
+                                Res_value::TYPE_REFERENCE,
+                                R::system_overlay_invalid::string::policy_config_signature,
+                                false /* rewrite */));
     ASSERT_RESULT(MappingExists(res, R::target::string::policy_signature, Res_value::TYPE_REFERENCE,
                                 R::system_overlay_invalid::string::policy_signature,
                                 false /* rewrite */));
@@ -342,6 +351,7 @@
   };
 
   CheckEntries(PolicyFlags::SIGNATURE);
+  CheckEntries(PolicyFlags::CONFIG_SIGNATURE);
   CheckEntries(PolicyFlags::PRODUCT_PARTITION);
   CheckEntries(PolicyFlags::SYSTEM_PARTITION);
   CheckEntries(PolicyFlags::VENDOR_PARTITION);
diff --git a/cmds/idmap2/tests/TestConstants.h b/cmds/idmap2/tests/TestConstants.h
index 6bc924e..641a7a8 100644
--- a/cmds/idmap2/tests/TestConstants.h
+++ b/cmds/idmap2/tests/TestConstants.h
@@ -19,11 +19,11 @@
 
 namespace android::idmap2::TestConstants {
 
-constexpr const auto TARGET_CRC = 0x41c60c8c;
-constexpr const auto TARGET_CRC_STRING = "41c60c8c";
+constexpr const auto TARGET_CRC =  0x7c2d4719;
+constexpr const auto TARGET_CRC_STRING = "7c2d4719";
 
-constexpr const auto OVERLAY_CRC = 0xc054fb26;
-constexpr const auto OVERLAY_CRC_STRING = "c054fb26";
+constexpr const auto OVERLAY_CRC = 0x5afff726;
+constexpr const auto OVERLAY_CRC_STRING = "5afff726";
 
 }  // namespace android::idmap2::TestConstants
 
diff --git a/cmds/idmap2/tests/data/overlay/overlay-no-name-static.apk b/cmds/idmap2/tests/data/overlay/overlay-no-name-static.apk
index 7c25985..dab25b1 100644
--- a/cmds/idmap2/tests/data/overlay/overlay-no-name-static.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay-no-name-static.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/overlay/overlay-no-name.apk b/cmds/idmap2/tests/data/overlay/overlay-no-name.apk
index c75f3e1..c8b95c2 100644
--- a/cmds/idmap2/tests/data/overlay/overlay-no-name.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay-no-name.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/overlay/overlay-shared.apk b/cmds/idmap2/tests/data/overlay/overlay-shared.apk
index 93dcc82..0a8b737 100644
--- a/cmds/idmap2/tests/data/overlay/overlay-shared.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay-shared.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/overlay/overlay-static-1.apk b/cmds/idmap2/tests/data/overlay/overlay-static-1.apk
index 5b8a6e4..fd41182 100644
--- a/cmds/idmap2/tests/data/overlay/overlay-static-1.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay-static-1.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/overlay/overlay-static-2.apk b/cmds/idmap2/tests/data/overlay/overlay-static-2.apk
index 698a1fd..b24765f 100644
--- a/cmds/idmap2/tests/data/overlay/overlay-static-2.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay-static-2.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/overlay/overlay.apk b/cmds/idmap2/tests/data/overlay/overlay.apk
index 1db303f..870575e 100644
--- a/cmds/idmap2/tests/data/overlay/overlay.apk
+++ b/cmds/idmap2/tests/data/overlay/overlay.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/signature-overlay/signature-overlay.apk b/cmds/idmap2/tests/data/signature-overlay/signature-overlay.apk
index 51e19de..e0fd204 100644
--- a/cmds/idmap2/tests/data/signature-overlay/signature-overlay.apk
+++ b/cmds/idmap2/tests/data/signature-overlay/signature-overlay.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/system-overlay-invalid/res/values/values.xml b/cmds/idmap2/tests/data/system-overlay-invalid/res/values/values.xml
index 7119d82..ebaf49c 100644
--- a/cmds/idmap2/tests/data/system-overlay-invalid/res/values/values.xml
+++ b/cmds/idmap2/tests/data/system-overlay-invalid/res/values/values.xml
@@ -26,6 +26,7 @@
     <string name="policy_odm">policy_odm</string>
     <string name="policy_oem">policy_oem</string>
     <string name="policy_actor">policy_actor</string>
+    <string name="policy_config_signature">policy_config_signature</string>
 
     <!-- Requests to overlay a resource that is not declared as overlayable. -->
     <string name="not_overlayable">not_overlayable</string>
diff --git a/cmds/idmap2/tests/data/system-overlay-invalid/system-overlay-invalid.apk b/cmds/idmap2/tests/data/system-overlay-invalid/system-overlay-invalid.apk
index bd99098..a63daf8 100644
--- a/cmds/idmap2/tests/data/system-overlay-invalid/system-overlay-invalid.apk
+++ b/cmds/idmap2/tests/data/system-overlay-invalid/system-overlay-invalid.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/system-overlay/system-overlay.apk b/cmds/idmap2/tests/data/system-overlay/system-overlay.apk
index a0fba43..90d2803 100644
--- a/cmds/idmap2/tests/data/system-overlay/system-overlay.apk
+++ b/cmds/idmap2/tests/data/system-overlay/system-overlay.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/target/res/values/overlayable.xml b/cmds/idmap2/tests/data/target/res/values/overlayable.xml
index ad4cd48..57e6c43 100644
--- a/cmds/idmap2/tests/data/target/res/values/overlayable.xml
+++ b/cmds/idmap2/tests/data/target/res/values/overlayable.xml
@@ -45,6 +45,10 @@
         <item type="string" name="policy_actor" />
     </policy>
 
+    <policy type="config_signature">
+        <item type="string" name="policy_config_signature"/>
+    </policy>
+
     <!-- Resources publicly overlayable -->
     <policy type="public">
         <item type="string" name="policy_public" />
diff --git a/cmds/idmap2/tests/data/target/res/values/values.xml b/cmds/idmap2/tests/data/target/res/values/values.xml
index 5230e25..00909a9 100644
--- a/cmds/idmap2/tests/data/target/res/values/values.xml
+++ b/cmds/idmap2/tests/data/target/res/values/values.xml
@@ -37,6 +37,7 @@
     <string name="policy_system">policy_system</string>
     <string name="policy_system_vendor">policy_system_vendor</string>
     <string name="policy_actor">policy_actor</string>
+    <string name="policy_config_signature">policy_config_signature</string>
 
     <string name="other">other</string>
 </resources>
diff --git a/cmds/idmap2/tests/data/target/target-no-overlayable.apk b/cmds/idmap2/tests/data/target/target-no-overlayable.apk
index 58504a7..cc3491d 100644
--- a/cmds/idmap2/tests/data/target/target-no-overlayable.apk
+++ b/cmds/idmap2/tests/data/target/target-no-overlayable.apk
Binary files differ
diff --git a/cmds/idmap2/tests/data/target/target.apk b/cmds/idmap2/tests/data/target/target.apk
index c80e5eb..4a58c5e 100644
--- a/cmds/idmap2/tests/data/target/target.apk
+++ b/cmds/idmap2/tests/data/target/target.apk
Binary files differ