diff --git a/cmds/idmap2/idmap2d/aidl/android/os/IIdmap2.aidl b/cmds/idmap2/idmap2d/aidl/android/os/IIdmap2.aidl
index 4a66715..cd474c0 100644
--- a/cmds/idmap2/idmap2d/aidl/android/os/IIdmap2.aidl
+++ b/cmds/idmap2/idmap2d/aidl/android/os/IIdmap2.aidl
@@ -25,6 +25,8 @@
   const int POLICY_VENDOR_PARTITION = 0x00000004;
   const int POLICY_PRODUCT_PARTITION = 0x00000008;
   const int POLICY_SIGNATURE = 0x00000010;
+  const int POLICY_ODM_PARTITION = 0x00000020;
+  const int POLICY_OEM_PARTITION = 0x00000040;
 
   @utf8InCpp String getIdmapPath(@utf8InCpp String overlayApkPath, int userId);
   boolean removeIdmap(@utf8InCpp String overlayApkPath, int userId);
diff --git a/cmds/idmap2/include/idmap2/Policies.h b/cmds/idmap2/include/idmap2/Policies.h
index 90c698c..87edd35 100644
--- a/cmds/idmap2/include/idmap2/Policies.h
+++ b/cmds/idmap2/include/idmap2/Policies.h
@@ -26,11 +26,13 @@
 
 namespace android::idmap2 {
 
-constexpr const char* kPolicyPublic = "public";
+constexpr const char* kPolicyOdm = "odm";
+constexpr const char* kPolicyOem = "oem";
 constexpr const char* kPolicyProduct = "product";
+constexpr const char* kPolicyPublic = "public";
+constexpr const char* kPolicySignature = "signature";
 constexpr const char* kPolicySystem = "system";
 constexpr const char* kPolicyVendor = "vendor";
-constexpr const char* kPolicySignature = "signature";
 
 using PolicyFlags = ResTable_overlayable_policy_header::PolicyFlags;
 using PolicyBitmask = uint32_t;
diff --git a/cmds/idmap2/libidmap2/Idmap.cpp b/cmds/idmap2/libidmap2/Idmap.cpp
index aec1a6f..4649675 100644
--- a/cmds/idmap2/libidmap2/Idmap.cpp
+++ b/cmds/idmap2/libidmap2/Idmap.cpp
@@ -282,6 +282,7 @@
                               const utils::OverlayManifestInfo& overlay_info,
                               const PolicyBitmask& fulfilled_policies, const ResourceId& resid) {
   static constexpr const PolicyBitmask sDefaultPolicies =
+      PolicyFlags::POLICY_ODM_PARTITION | PolicyFlags::POLICY_OEM_PARTITION |
       PolicyFlags::POLICY_SYSTEM_PARTITION | PolicyFlags::POLICY_VENDOR_PARTITION |
       PolicyFlags::POLICY_PRODUCT_PARTITION | PolicyFlags::POLICY_SIGNATURE;
 
diff --git a/cmds/idmap2/libidmap2/Policies.cpp b/cmds/idmap2/libidmap2/Policies.cpp
index 0a0cecf..495fe61 100644
--- a/cmds/idmap2/libidmap2/Policies.cpp
+++ b/cmds/idmap2/libidmap2/Policies.cpp
@@ -17,8 +17,8 @@
 #include "idmap2/Policies.h"
 
 #include <iterator>
-#include <map>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 #include "androidfw/ResourceTypes.h"
@@ -27,19 +27,17 @@
 
 namespace android::idmap2 {
 
-namespace {
-
-const std::map<android::StringPiece, PolicyFlags> kStringToFlag = {
-    {kPolicyPublic, PolicyFlags::POLICY_PUBLIC},
-    {kPolicyProduct, PolicyFlags::POLICY_PRODUCT_PARTITION},
-    {kPolicySystem, PolicyFlags::POLICY_SYSTEM_PARTITION},
-    {kPolicyVendor, PolicyFlags::POLICY_VENDOR_PARTITION},
-    {kPolicySignature, PolicyFlags::POLICY_SIGNATURE},
-};
-
-}  // namespace
-
 Result<PolicyBitmask> PoliciesToBitmask(const std::vector<std::string>& policies) {
+  static const std::unordered_map<android::StringPiece, PolicyFlags> kStringToFlag = {
+      {kPolicyOdm, PolicyFlags::POLICY_ODM_PARTITION},
+      {kPolicyOem, PolicyFlags::POLICY_OEM_PARTITION},
+      {kPolicyPublic, PolicyFlags::POLICY_PUBLIC},
+      {kPolicyProduct, PolicyFlags::POLICY_PRODUCT_PARTITION},
+      {kPolicySignature, PolicyFlags::POLICY_SIGNATURE},
+      {kPolicySystem, PolicyFlags::POLICY_SYSTEM_PARTITION},
+      {kPolicyVendor, PolicyFlags::POLICY_VENDOR_PARTITION},
+  };
+
   PolicyBitmask bitmask = 0;
   for (const std::string& policy : policies) {
     const auto iter = kStringToFlag.find(policy);
@@ -55,6 +53,15 @@
 
 std::vector<std::string> BitmaskToPolicies(const PolicyBitmask& bitmask) {
   std::vector<std::string> policies;
+
+  if ((bitmask & PolicyFlags::POLICY_ODM_PARTITION) != 0) {
+    policies.emplace_back(kPolicyOdm);
+  }
+
+  if ((bitmask & PolicyFlags::POLICY_OEM_PARTITION) != 0) {
+    policies.emplace_back(kPolicyOem);
+  }
+
   if ((bitmask & PolicyFlags::POLICY_PUBLIC) != 0) {
     policies.emplace_back(kPolicyPublic);
   }
@@ -63,6 +70,10 @@
     policies.emplace_back(kPolicyProduct);
   }
 
+  if ((bitmask & PolicyFlags::POLICY_SIGNATURE) != 0) {
+    policies.emplace_back(kPolicySignature);
+  }
+
   if ((bitmask & PolicyFlags::POLICY_SYSTEM_PARTITION) != 0) {
     policies.emplace_back(kPolicySystem);
   }
@@ -71,10 +82,6 @@
     policies.emplace_back(kPolicyVendor);
   }
 
-  if ((bitmask & PolicyFlags::POLICY_SIGNATURE) != 0) {
-    policies.emplace_back(kPolicySignature);
-  }
-
   return policies;
 }
 
diff --git a/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp b/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
index 9cdc86c..9348ab7 100644
--- a/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
+++ b/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
@@ -109,49 +109,55 @@
   success = LoadedIdmap::Lookup(header, 0x0002, &entry);  // string/c
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0003, &entry);  // string/other
+  success = LoadedIdmap::Lookup(header, 0x0003, &entry);  // string/policy_odm
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0004, &entry);  // string/not_overlayable
+  success = LoadedIdmap::Lookup(header, 0x0004, &entry);  // string/policy_oem
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0005, &entry);  // string/policy_product
+  success = LoadedIdmap::Lookup(header, 0x0005, &entry);  // string/other
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0006, &entry);  // string/policy_public
+  success = LoadedIdmap::Lookup(header, 0x0006, &entry);  // string/not_overlayable
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0007, &entry);  // string/policy_system
+  success = LoadedIdmap::Lookup(header, 0x0007, &entry);  // string/policy_product
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0008, &entry);  // string/policy_system_vendor
+  success = LoadedIdmap::Lookup(header, 0x0008, &entry);  // string/policy_public
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0009, &entry);  // string/policy_signature
+  success = LoadedIdmap::Lookup(header, 0x0009, &entry);  // string/policy_system
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x000a, &entry);  // string/str1
+  success = LoadedIdmap::Lookup(header, 0x000a, &entry);  // string/policy_system_vendor
+  ASSERT_FALSE(success);
+
+  success = LoadedIdmap::Lookup(header, 0x000b, &entry);  // string/policy_signature
+  ASSERT_FALSE(success);
+
+  success = LoadedIdmap::Lookup(header, 0x000c, &entry);  // string/str1
   ASSERT_TRUE(success);
   ASSERT_EQ(entry, 0x0000);
 
-  success = LoadedIdmap::Lookup(header, 0x000b, &entry);  // string/str2
+  success = LoadedIdmap::Lookup(header, 0x000d, &entry);  // string/str2
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x000c, &entry);  // string/str3
+  success = LoadedIdmap::Lookup(header, 0x000e, &entry);  // string/str3
   ASSERT_TRUE(success);
   ASSERT_EQ(entry, 0x0001);
 
-  success = LoadedIdmap::Lookup(header, 0x000d, &entry);  // string/str4
+  success = LoadedIdmap::Lookup(header, 0x000f, &entry);  // string/str4
   ASSERT_TRUE(success);
   ASSERT_EQ(entry, 0x0002);
 
-  success = LoadedIdmap::Lookup(header, 0x000e, &entry);  // string/x
+  success = LoadedIdmap::Lookup(header, 0x0010, &entry);  // string/x
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x000f, &entry);  // string/y
+  success = LoadedIdmap::Lookup(header, 0x0011, &entry);  // string/y
   ASSERT_FALSE(success);
 
-  success = LoadedIdmap::Lookup(header, 0x0010, &entry);  // string/z
+  success = LoadedIdmap::Lookup(header, 0x0012, &entry);  // string/z
   ASSERT_FALSE(success);
 }
 
diff --git a/cmds/idmap2/tests/Idmap2BinaryTests.cpp b/cmds/idmap2/tests/Idmap2BinaryTests.cpp
index c18744c..8a48f4b 100644
--- a/cmds/idmap2/tests/Idmap2BinaryTests.cpp
+++ b/cmds/idmap2/tests/Idmap2BinaryTests.cpp
@@ -128,9 +128,9 @@
   ASSERT_THAT(result, NotNull());
   ASSERT_EQ(result->status, EXIT_SUCCESS) << result->stderr;
   ASSERT_NE(result->stdout.find("0x7f010000 -> 0x7f010000 integer/int1"), std::string::npos);
-  ASSERT_NE(result->stdout.find("0x7f02000a -> 0x7f020000 string/str1"), std::string::npos);
-  ASSERT_NE(result->stdout.find("0x7f02000c -> 0x7f020001 string/str3"), std::string::npos);
-  ASSERT_NE(result->stdout.find("0x7f02000d -> 0x7f020002 string/str4"), std::string::npos);
+  ASSERT_NE(result->stdout.find("0x7f02000c -> 0x7f020000 string/str1"), std::string::npos);
+  ASSERT_NE(result->stdout.find("0x7f02000e -> 0x7f020001 string/str3"), std::string::npos);
+  ASSERT_NE(result->stdout.find("0x7f02000f -> 0x7f020002 string/str4"), std::string::npos);
   ASSERT_EQ(result->stdout.find("00000210:     007f  target package id"), std::string::npos);
 
   // clang-format off
@@ -299,7 +299,7 @@
                           "lookup",
                           "--idmap-path", GetIdmapPath(),
                           "--config", "",
-                          "--resid", "0x7f02000a"});  // string/str1
+                          "--resid", "0x7f02000c"});  // string/str1
   // clang-format on
   ASSERT_THAT(result, NotNull());
   ASSERT_EQ(result->status, EXIT_SUCCESS) << result->stderr;
diff --git a/cmds/idmap2/tests/IdmapTests.cpp b/cmds/idmap2/tests/IdmapTests.cpp
index 90fe9a7..0f47f1e 100644
--- a/cmds/idmap2/tests/IdmapTests.cpp
+++ b/cmds/idmap2/tests/IdmapTests.cpp
@@ -194,7 +194,7 @@
   ASSERT_THAT(idmap->GetHeader(), NotNull());
   ASSERT_EQ(idmap->GetHeader()->GetMagic(), 0x504d4449U);
   ASSERT_EQ(idmap->GetHeader()->GetVersion(), 0x01U);
-  ASSERT_EQ(idmap->GetHeader()->GetTargetCrc(), 0xd513ca1b);
+  ASSERT_EQ(idmap->GetHeader()->GetTargetCrc(), 0x76a20829);
   ASSERT_EQ(idmap->GetHeader()->GetOverlayCrc(), 0x8635c2ed);
   ASSERT_EQ(idmap->GetHeader()->GetTargetPath().to_string(), target_apk_path);
   ASSERT_EQ(idmap->GetHeader()->GetOverlayPath(), overlay_apk_path);
@@ -220,7 +220,7 @@
   ASSERT_EQ(types[1]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[1]->GetOverlayTypeId(), 0x02U);
   ASSERT_EQ(types[1]->GetEntryCount(), 4U);
-  ASSERT_EQ(types[1]->GetEntryOffset(), 10U);
+  ASSERT_EQ(types[1]->GetEntryOffset(), 12U);
   ASSERT_EQ(types[1]->GetEntry(0), 0x0000U);
   ASSERT_EQ(types[1]->GetEntry(1), kNoEntry);
   ASSERT_EQ(types[1]->GetEntry(2), 0x0001U);
@@ -251,7 +251,7 @@
   ASSERT_EQ(types[0]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[0]->GetOverlayTypeId(), 0x01U);
   ASSERT_EQ(types[0]->GetEntryCount(), 4U);
-  ASSERT_EQ(types[0]->GetEntryOffset(), 6U);
+  ASSERT_EQ(types[0]->GetEntryOffset(), 8U);
   ASSERT_EQ(types[0]->GetEntry(0), 0x0000U);   // string/policy_public
   ASSERT_EQ(types[0]->GetEntry(1), kNoEntry);  // string/policy_signature
   ASSERT_EQ(types[0]->GetEntry(2), 0x0001U);   // string/policy_system
@@ -281,7 +281,7 @@
   ASSERT_EQ(types[0]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[0]->GetOverlayTypeId(), 0x01U);
   ASSERT_EQ(types[0]->GetEntryCount(), 1U);
-  ASSERT_EQ(types[0]->GetEntryOffset(), 7U);
+  ASSERT_EQ(types[0]->GetEntryOffset(), 9U);
   ASSERT_EQ(types[0]->GetEntry(0), 0x0000U);  // string/policy_signature
 }
 
@@ -310,11 +310,11 @@
   ASSERT_EQ(types[0]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[0]->GetOverlayTypeId(), 0x01U);
   ASSERT_EQ(types[0]->GetEntryCount(), 4U);
-  ASSERT_EQ(types[0]->GetEntryOffset(), 6U);
-  ASSERT_EQ(types[0]->GetEntry(0), 0x0003U);   // string/policy_public
+  ASSERT_EQ(types[0]->GetEntryOffset(), 8U);
+  ASSERT_EQ(types[0]->GetEntry(0), 0x0005U);   // string/policy_public
   ASSERT_EQ(types[0]->GetEntry(1), kNoEntry);  // string/policy_signature
-  ASSERT_EQ(types[0]->GetEntry(2), 0x0005U);   // string/policy_system
-  ASSERT_EQ(types[0]->GetEntry(3), 0x0006U);   // string/policy_system_vendor
+  ASSERT_EQ(types[0]->GetEntry(2), 0x0007U);   // string/policy_system
+  ASSERT_EQ(types[0]->GetEntry(3), 0x0008U);   // string/policy_system_vendor
 }
 
 // Overlays should ignore all overlayable restrictions if enforcement of overlayable is disabled.
@@ -341,15 +341,17 @@
 
   ASSERT_EQ(types[0]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[0]->GetOverlayTypeId(), 0x01U);
-  ASSERT_EQ(types[0]->GetEntryCount(), 7U);
+  ASSERT_EQ(types[0]->GetEntryCount(), 9U);
   ASSERT_EQ(types[0]->GetEntryOffset(), 3U);
   ASSERT_EQ(types[0]->GetEntry(0), 0x0000U);  // string/not_overlayable
-  ASSERT_EQ(types[0]->GetEntry(1), 0x0001U);  // string/other
-  ASSERT_EQ(types[0]->GetEntry(2), 0x0002U);  // string/policy_product
-  ASSERT_EQ(types[0]->GetEntry(3), 0x0003U);  // string/policy_signature
-  ASSERT_EQ(types[0]->GetEntry(4), 0x0004U);  // string/policy_public
-  ASSERT_EQ(types[0]->GetEntry(5), 0x0005U);  // string/policy_system
-  ASSERT_EQ(types[0]->GetEntry(6), 0x0006U);  // string/policy_system_vendor
+  ASSERT_EQ(types[0]->GetEntry(1), 0x0001U);  // string/policy_odm
+  ASSERT_EQ(types[0]->GetEntry(2), 0x0002U);  // string/policy_oem
+  ASSERT_EQ(types[0]->GetEntry(3), 0x0003U);  // string/other
+  ASSERT_EQ(types[0]->GetEntry(4), 0x0004U);  // string/policy_product
+  ASSERT_EQ(types[0]->GetEntry(5), 0x0005U);  // string/policy_public
+  ASSERT_EQ(types[0]->GetEntry(6), 0x0006U);  // string/policy_signature
+  ASSERT_EQ(types[0]->GetEntry(7), 0x0007U);  // string/policy_system
+  ASSERT_EQ(types[0]->GetEntry(8), 0x0008U);  // string/policy_system_vendor
 }
 
 // Overlays that do not specify a target <overlayable> can overlay resources defined as overlayable.
@@ -381,7 +383,7 @@
   ASSERT_EQ(types[1]->GetTargetTypeId(), 0x02U);
   ASSERT_EQ(types[1]->GetOverlayTypeId(), 0x02U);
   ASSERT_EQ(types[1]->GetEntryCount(), 4U);
-  ASSERT_EQ(types[1]->GetEntryOffset(), 10U);
+  ASSERT_EQ(types[1]->GetEntryOffset(), 12U);
   ASSERT_EQ(types[1]->GetEntry(0), 0x0000U);   // string/str1
   ASSERT_EQ(types[1]->GetEntry(1), kNoEntry);  // string/str2
   ASSERT_EQ(types[1]->GetEntry(2), 0x0001U);   // string/str3
@@ -412,7 +414,6 @@
     ASSERT_EQ(dataBlocks.size(), 1U);
 
     const std::unique_ptr<const IdmapData>& data = dataBlocks[0];
-
     ASSERT_EQ(data->GetHeader()->GetTargetPackageId(), 0x7fU);
     ASSERT_EQ(data->GetHeader()->GetTypeCount(), 1U);
 
@@ -421,15 +422,17 @@
 
     ASSERT_EQ(types[0]->GetTargetTypeId(), 0x02U);
     ASSERT_EQ(types[0]->GetOverlayTypeId(), 0x01U);
-    ASSERT_EQ(types[0]->GetEntryCount(), 7U);
+    ASSERT_EQ(types[0]->GetEntryCount(), 9U);
     ASSERT_EQ(types[0]->GetEntryOffset(), 3U);
     ASSERT_EQ(types[0]->GetEntry(0), 0x0000U);  // string/not_overlayable
-    ASSERT_EQ(types[0]->GetEntry(1), 0x0001U);  // string/other
-    ASSERT_EQ(types[0]->GetEntry(2), 0x0002U);  // string/policy_product
-    ASSERT_EQ(types[0]->GetEntry(3), 0x0003U);  // string/policy_public
-    ASSERT_EQ(types[0]->GetEntry(4), 0x0004U);  // string/string/policy_signature
-    ASSERT_EQ(types[0]->GetEntry(5), 0x0005U);  // string/policy_system
-    ASSERT_EQ(types[0]->GetEntry(6), 0x0006U);  // string/policy_system_vendor
+    ASSERT_EQ(types[0]->GetEntry(1), 0x0001U);  // string/policy_odm
+    ASSERT_EQ(types[0]->GetEntry(2), 0x0002U);  // string/policy_oem
+    ASSERT_EQ(types[0]->GetEntry(3), 0x0003U);  // string/other
+    ASSERT_EQ(types[0]->GetEntry(4), 0x0004U);  // string/policy_product
+    ASSERT_EQ(types[0]->GetEntry(5), 0x0005U);  // string/policy_public
+    ASSERT_EQ(types[0]->GetEntry(6), 0x0006U);  // string/policy_signature
+    ASSERT_EQ(types[0]->GetEntry(7), 0x0007U);  // string/policy_system
+    ASSERT_EQ(types[0]->GetEntry(8), 0x0008U);  // string/policy_system_vendor
   };
 
   CreateIdmap(target_apk_path, overlay_apk_path, PolicyFlags::POLICY_SIGNATURE,
@@ -451,6 +454,16 @@
               /* enforce_overlayable */ true, &idmap);
   ASSERT_THAT(idmap, NotNull());
   CheckEntries();
+
+  CreateIdmap(target_apk_path, overlay_apk_path, PolicyFlags::POLICY_ODM_PARTITION,
+              /* enforce_overlayable */ true, &idmap);
+  ASSERT_THAT(idmap, NotNull());
+  CheckEntries();
+
+  CreateIdmap(target_apk_path, overlay_apk_path, PolicyFlags::POLICY_OEM_PARTITION,
+              /* enforce_overlayable */ true, &idmap);
+  ASSERT_THAT(idmap, NotNull());
+  CheckEntries();
 }
 
 TEST(IdmapTests, FailToCreateIdmapFromApkAssetsIfPathTooLong) {
diff --git a/cmds/idmap2/tests/PoliciesTests.cpp b/cmds/idmap2/tests/PoliciesTests.cpp
index e30da76..eca7404 100644
--- a/cmds/idmap2/tests/PoliciesTests.cpp
+++ b/cmds/idmap2/tests/PoliciesTests.cpp
@@ -38,9 +38,10 @@
   ASSERT_TRUE(bitmask3);
   ASSERT_EQ(*bitmask3, PolicyFlags::POLICY_SYSTEM_PARTITION | PolicyFlags::POLICY_VENDOR_PARTITION);
 
-  const auto bitmask4 = PoliciesToBitmask({"public", "product", "system", "vendor"});
+  const auto bitmask4 = PoliciesToBitmask({"odm", "oem", "public", "product", "system", "vendor"});
   ASSERT_TRUE(bitmask4);
-  ASSERT_EQ(*bitmask4, PolicyFlags::POLICY_PUBLIC | PolicyFlags::POLICY_PRODUCT_PARTITION |
+  ASSERT_EQ(*bitmask4, PolicyFlags::POLICY_ODM_PARTITION | PolicyFlags::POLICY_OEM_PARTITION |
+                           PolicyFlags::POLICY_PUBLIC | PolicyFlags::POLICY_PRODUCT_PARTITION |
                            PolicyFlags::POLICY_SYSTEM_PARTITION |
                            PolicyFlags::POLICY_VENDOR_PARTITION);
 
@@ -64,4 +65,28 @@
   ASSERT_FALSE(bitmask10);
 }
 
+TEST(PoliciesTests, BitmaskToPolicies) {
+  const auto policies1 = BitmaskToPolicies(PolicyFlags::POLICY_PUBLIC);
+  ASSERT_EQ(1, policies1.size());
+  ASSERT_EQ(policies1[0], "public");
+
+  const auto policies2 = BitmaskToPolicies(PolicyFlags::POLICY_SYSTEM_PARTITION |
+                                           PolicyFlags::POLICY_VENDOR_PARTITION);
+  ASSERT_EQ(2, policies2.size());
+  ASSERT_EQ(policies2[0], "system");
+  ASSERT_EQ(policies2[1], "vendor");
+
+  const auto policies3 = BitmaskToPolicies(
+      PolicyFlags::POLICY_ODM_PARTITION | PolicyFlags::POLICY_OEM_PARTITION |
+      PolicyFlags::POLICY_PUBLIC | PolicyFlags::POLICY_PRODUCT_PARTITION |
+      PolicyFlags::POLICY_SYSTEM_PARTITION | PolicyFlags::POLICY_VENDOR_PARTITION);
+  ASSERT_EQ(2, policies2.size());
+  ASSERT_EQ(policies3[0], "odm");
+  ASSERT_EQ(policies3[1], "oem");
+  ASSERT_EQ(policies3[2], "public");
+  ASSERT_EQ(policies3[3], "product");
+  ASSERT_EQ(policies3[4], "system");
+  ASSERT_EQ(policies3[5], "vendor");
+}
+
 }  // namespace android::idmap2
diff --git a/cmds/idmap2/tests/RawPrintVisitorTests.cpp b/cmds/idmap2/tests/RawPrintVisitorTests.cpp
index 64518fd..2695176 100644
--- a/cmds/idmap2/tests/RawPrintVisitorTests.cpp
+++ b/cmds/idmap2/tests/RawPrintVisitorTests.cpp
@@ -49,7 +49,7 @@
 
   ASSERT_NE(stream.str().find("00000000: 504d4449  magic\n"), std::string::npos);
   ASSERT_NE(stream.str().find("00000004: 00000001  version\n"), std::string::npos);
-  ASSERT_NE(stream.str().find("00000008: d513ca1b  target crc\n"), std::string::npos);
+  ASSERT_NE(stream.str().find("00000008: 76a20829  target crc\n"), std::string::npos);
   ASSERT_NE(stream.str().find("0000000c: 8635c2ed  overlay crc\n"), std::string::npos);
   ASSERT_NE(stream.str().find("0000021c: 00000000  0x7f010000 -> 0x7f010000 integer/int1\n"),
             std::string::npos);
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 0270400..9ebfae4 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
@@ -23,6 +23,8 @@
     <!-- Requests to overlay a resource that belongs to a policy the overlay does not fulfill. -->
     <string name="policy_product">policy_product</string>
     <string name="policy_signature">policy_signature</string>
+    <string name="policy_odm">policy_odm</string>
+    <string name="policy_oem">policy_oem</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 9448939..1456e74 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/target/res/values/overlayable.xml b/cmds/idmap2/tests/data/target/res/values/overlayable.xml
index 0bf83fa..8389f56 100644
--- a/cmds/idmap2/tests/data/target/res/values/overlayable.xml
+++ b/cmds/idmap2/tests/data/target/res/values/overlayable.xml
@@ -33,6 +33,14 @@
         <item type="string" name="policy_product" />
     </policy>
 
+    <policy type="odm">
+        <item type="string" name="policy_odm" />
+    </policy>
+
+    <policy type="oem">
+        <item type="string" name="policy_oem" />
+    </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 edd53f4..a892c98 100644
--- a/cmds/idmap2/tests/data/target/res/values/values.xml
+++ b/cmds/idmap2/tests/data/target/res/values/values.xml
@@ -29,11 +29,13 @@
     <!-- This resources is not marked as overlayable -->
     <string name="not_overlayable">not_overlayable</string>
 
+    <string name="policy_public">policy_public</string>
+    <string name="policy_odm">policy_odm</string>
+    <string name="policy_oem">policy_oem</string>
+    <string name="policy_product">policy_product</string>
+    <string name="policy_signature">policy_signature</string>
     <string name="policy_system">policy_system</string>
     <string name="policy_system_vendor">policy_system_vendor</string>
-    <string name="policy_product">policy_product</string>
-    <string name="policy_public">policy_public</string>
-    <string name="policy_signature">policy_signature</string>
 
-    <item type="string" name="other" />
+    <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 908b54a..033305a 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 da3c1ae..9bcd6dc 100644
--- a/cmds/idmap2/tests/data/target/target.apk
+++ b/cmds/idmap2/tests/data/target/target.apk
Binary files differ
diff --git a/libs/androidfw/include/androidfw/ResourceTypes.h b/libs/androidfw/include/androidfw/ResourceTypes.h
index 875b90b..fc635aa 100644
--- a/libs/androidfw/include/androidfw/ResourceTypes.h
+++ b/libs/androidfw/include/androidfw/ResourceTypes.h
@@ -1651,6 +1651,14 @@
     // The overlay must be signed with the same signature as the actor of the target resource,
     // which can be separate or the same as the target package with the resource.
     POLICY_SIGNATURE = 0x00000010,
+
+    // The overlay must reside of the odm partition or must have existed on the odm
+    // partition before an upgrade to overlay these resources.
+    POLICY_ODM_PARTITION = 0x00000020,
+
+    // The overlay must reside of the oem partition or must have existed on the oem
+    // partition before an upgrade to overlay these resources.
+    POLICY_OEM_PARTITION = 0x00000040,
   };
   uint32_t policy_flags;
 
diff --git a/services/core/java/com/android/server/om/IdmapManager.java b/services/core/java/com/android/server/om/IdmapManager.java
index fd68a8b..4b435de 100644
--- a/services/core/java/com/android/server/om/IdmapManager.java
+++ b/services/core/java/com/android/server/om/IdmapManager.java
@@ -220,9 +220,19 @@
             return fulfilledPolicies | IIdmap2.POLICY_PRODUCT_PARTITION;
         }
 
+        // Odm partition (/odm)
+        if (ai.isOdm()) {
+            return fulfilledPolicies | IIdmap2.POLICY_ODM_PARTITION;
+        }
+
+        // Oem partition (/oem)
+        if (ai.isOem()) {
+            return fulfilledPolicies | IIdmap2.POLICY_OEM_PARTITION;
+        }
+
         // Check partitions for which there exists no policy so overlays on these partitions will
         // not fulfill the system policy.
-        if (ai.isOem() || ai.isProductServices()) {
+        if (ai.isProductServices()) {
             return fulfilledPolicies;
         }
 
diff --git a/tools/aapt2/ResourceParser.cpp b/tools/aapt2/ResourceParser.cpp
index 5e8d870..fe401e2 100644
--- a/tools/aapt2/ResourceParser.cpp
+++ b/tools/aapt2/ResourceParser.cpp
@@ -1143,34 +1143,38 @@
       } else if (Maybe<StringPiece> maybe_type = xml::FindNonEmptyAttribute(parser, "type")) {
         // Parse the polices separated by vertical bar characters to allow for specifying multiple
         // policies. Items within the policy tag will have the specified policy.
-        for (StringPiece part : util::Tokenize(maybe_type.value(), '|')) {
+        static const auto kPolicyMap =
+            ImmutableMap<StringPiece, OverlayableItem::Policy>::CreatePreSorted({
+                {"odm", OverlayableItem::Policy::kOdm},
+                {"oem", OverlayableItem::Policy::kOem},
+                {"product", OverlayableItem::Policy::kProduct},
+                {"public", OverlayableItem::Policy::kPublic},
+                {"signature", OverlayableItem::Policy::kSignature},
+                {"system", OverlayableItem::Policy::kSystem},
+                {"vendor", OverlayableItem::Policy::kVendor},
+            });
+
+        for (const StringPiece& part : util::Tokenize(maybe_type.value(), '|')) {
           StringPiece trimmed_part = util::TrimWhitespace(part);
-          if (trimmed_part == "public") {
-            current_policies |= OverlayableItem::Policy::kPublic;
-          } else if (trimmed_part == "product") {
-            current_policies |= OverlayableItem::Policy::kProduct;
-          } else if (trimmed_part == "system") {
-            current_policies |= OverlayableItem::Policy::kSystem;
-          } else if (trimmed_part == "vendor") {
-            current_policies |= OverlayableItem::Policy::kVendor;
-          } else if (trimmed_part == "signature") {
-            current_policies |= OverlayableItem::Policy::kSignature;
-          } else {
+          const auto policy = kPolicyMap.find(trimmed_part);
+          if (policy == kPolicyMap.end()) {
             diag_->Error(DiagMessage(element_source)
                          << "<policy> has unsupported type '" << trimmed_part << "'");
             error = true;
             continue;
           }
+
+          current_policies |= policy->second;
         }
       } else {
         diag_->Error(DiagMessage(element_source)
-                         << "<policy> must have a 'type' attribute");
+                     << "<policy> must have a 'type' attribute");
         error = true;
         continue;
       }
     } else if (!ShouldIgnoreElement(element_namespace, element_name)) {
       diag_->Error(DiagMessage(element_source) << "invalid element <" << element_name << "> "
-                                            << " in <overlayable>");
+                                               << " in <overlayable>");
       error = true;
       break;
     }
diff --git a/tools/aapt2/ResourceParser_test.cpp b/tools/aapt2/ResourceParser_test.cpp
index 8577921..7c8b6d0 100644
--- a/tools/aapt2/ResourceParser_test.cpp
+++ b/tools/aapt2/ResourceParser_test.cpp
@@ -971,6 +971,12 @@
         <policy type="signature">
           <item type="string" name="foz" />
         </policy>
+        <policy type="odm">
+          <item type="string" name="biz" />
+        </policy>
+        <policy type="oem">
+          <item type="string" name="buz" />
+        </policy>
       </overlayable>)";
   ASSERT_TRUE(TestParse(input));
 
@@ -1013,6 +1019,22 @@
   result_overlayable_item = search_result.value().entry->overlayable_item.value();
   EXPECT_THAT(result_overlayable_item.overlayable->name, Eq("Name"));
   EXPECT_THAT(result_overlayable_item.policies, Eq(OverlayableItem::Policy::kSignature));
+
+  search_result = table_.FindResource(test::ParseNameOrDie("string/biz"));
+  ASSERT_TRUE(search_result);
+  ASSERT_THAT(search_result.value().entry, NotNull());
+  ASSERT_TRUE(search_result.value().entry->overlayable_item);
+  result_overlayable_item = search_result.value().entry->overlayable_item.value();
+  EXPECT_THAT(result_overlayable_item.overlayable->name, Eq("Name"));
+  EXPECT_THAT(result_overlayable_item.policies, Eq(OverlayableItem::Policy::kOdm));
+
+  search_result = table_.FindResource(test::ParseNameOrDie("string/buz"));
+  ASSERT_TRUE(search_result);
+  ASSERT_THAT(search_result.value().entry, NotNull());
+  ASSERT_TRUE(search_result.value().entry->overlayable_item);
+  result_overlayable_item = search_result.value().entry->overlayable_item.value();
+  EXPECT_THAT(result_overlayable_item.overlayable->name, Eq("Name"));
+  EXPECT_THAT(result_overlayable_item.policies, Eq(OverlayableItem::Policy::kOem));
 }
 
 TEST_F(ResourceParserTest, ParseOverlayableNoPolicyError) {
diff --git a/tools/aapt2/ResourceTable.h b/tools/aapt2/ResourceTable.h
index 7ed7897..30ba1ae 100644
--- a/tools/aapt2/ResourceTable.h
+++ b/tools/aapt2/ResourceTable.h
@@ -79,22 +79,28 @@
   // Represents the types overlays that are allowed to overlay the resource.
   typedef uint32_t PolicyFlags;
   enum Policy : uint32_t {
-    kNone = 0x00,
+    kNone = 0x00000000,
 
     // The resource can be overlaid by any overlay.
-    kPublic = 0x01,
+    kPublic = 0x00000001,
 
     // The resource can be overlaid by any overlay on the system partition.
-    kSystem = 0x02,
+    kSystem = 0x00000002,
 
     // The resource can be overlaid by any overlay on the vendor partition.
-    kVendor = 0x04,
+    kVendor = 0x00000004,
 
     // The resource can be overlaid by any overlay on the product partition.
-    kProduct = 0x08,
+    kProduct = 0x00000008,
 
     // The resource can be overlaid by any overlay signed with the same signature as its actor.
-    kSignature = 0x010,
+    kSignature = 0x00000010,
+
+    // The resource can be overlaid by any overlay on the odm partition.
+    kOdm = 0x00000020,
+
+    // The resource can be overlaid by any overlay on the oem partition.
+    kOem = 0x00000040,
   };
 
   std::shared_ptr<Overlayable> overlayable;
diff --git a/tools/aapt2/Resources.proto b/tools/aapt2/Resources.proto
index a2fd7c6..12cf65b 100644
--- a/tools/aapt2/Resources.proto
+++ b/tools/aapt2/Resources.proto
@@ -157,6 +157,8 @@
     VENDOR = 3;
     PRODUCT = 4;
     SIGNATURE = 5;
+    ODM = 6;
+    OEM = 7;
   }
 
   // The location of the <item> declaration in source.
diff --git a/tools/aapt2/format/binary/BinaryResourceParser.cpp b/tools/aapt2/format/binary/BinaryResourceParser.cpp
index 59eb9ec2..fd8e36e 100644
--- a/tools/aapt2/format/binary/BinaryResourceParser.cpp
+++ b/tools/aapt2/format/binary/BinaryResourceParser.cpp
@@ -475,6 +475,14 @@
           & ResTable_overlayable_policy_header::POLICY_SIGNATURE) {
         policies |= OverlayableItem::Policy::kSignature;
       }
+      if (policy_header->policy_flags
+          & ResTable_overlayable_policy_header::POLICY_ODM_PARTITION) {
+        policies |= OverlayableItem::Policy::kOdm;
+      }
+      if (policy_header->policy_flags
+          & ResTable_overlayable_policy_header::POLICY_OEM_PARTITION) {
+        policies |= OverlayableItem::Policy::kOem;
+      }
 
       const ResTable_ref* const ref_begin = reinterpret_cast<const ResTable_ref*>(
           ((uint8_t *)policy_header) + util::DeviceToHost32(policy_header->header.headerSize));
diff --git a/tools/aapt2/format/binary/TableFlattener.cpp b/tools/aapt2/format/binary/TableFlattener.cpp
index aa578a2..f2e72da 100644
--- a/tools/aapt2/format/binary/TableFlattener.cpp
+++ b/tools/aapt2/format/binary/TableFlattener.cpp
@@ -496,6 +496,12 @@
         if (item.policies & OverlayableItem::Policy::kSignature) {
           policy_flags |= ResTable_overlayable_policy_header::POLICY_SIGNATURE;
         }
+        if (item.policies & OverlayableItem::Policy::kOdm) {
+          policy_flags |= ResTable_overlayable_policy_header::POLICY_ODM_PARTITION;
+        }
+        if (item.policies & OverlayableItem::Policy::kOem) {
+          policy_flags |= ResTable_overlayable_policy_header::POLICY_OEM_PARTITION;
+        }
 
         auto policy = overlayable_chunk->policy_ids.find(policy_flags);
         if (policy != overlayable_chunk->policy_ids.end()) {
diff --git a/tools/aapt2/format/binary/TableFlattener_test.cpp b/tools/aapt2/format/binary/TableFlattener_test.cpp
index 4c5dbec..a940923 100644
--- a/tools/aapt2/format/binary/TableFlattener_test.cpp
+++ b/tools/aapt2/format/binary/TableFlattener_test.cpp
@@ -724,8 +724,8 @@
 
   std::string name_two = "com.app.test:integer/overlayable_two";
   OverlayableItem overlayable_item_two(group);
-  overlayable_item_two.policies |= OverlayableItem::Policy::kProduct;
-  overlayable_item_two.policies |= OverlayableItem::Policy::kSystem;
+  overlayable_item_two.policies |= OverlayableItem::Policy::kOdm;
+  overlayable_item_two.policies |= OverlayableItem::Policy::kOem;
   overlayable_item_two.policies |= OverlayableItem::Policy::kVendor;
 
   std::string name_three = "com.app.test:integer/overlayable_three";
@@ -744,6 +744,7 @@
           .AddSimple(name_three, ResourceId(0x7f020003))
           .SetOverlayable(name_three, overlayable_item_three)
           .Build();
+
   ResourceTable output_table;
   ASSERT_TRUE(Flatten(context_.get(), {}, table.get(), &output_table));
   auto search_result = output_table.FindResource(test::ParseNameOrDie(name_zero));
@@ -755,6 +756,7 @@
   EXPECT_EQ(result_overlayable.overlayable->actor, "overlay://theme");
   EXPECT_EQ(result_overlayable.policies, OverlayableItem::Policy::kSystem
                                          | OverlayableItem::Policy::kProduct);
+
   search_result = output_table.FindResource(test::ParseNameOrDie(name_one));
   ASSERT_TRUE(search_result);
   ASSERT_THAT(search_result.value().entry, NotNull());
@@ -763,6 +765,7 @@
   EXPECT_EQ(result_overlayable.overlayable->name, "OtherName");
   EXPECT_EQ(result_overlayable.overlayable->actor, "overlay://customization");
   EXPECT_EQ(result_overlayable.policies, OverlayableItem::Policy::kPublic);
+
   search_result = output_table.FindResource(test::ParseNameOrDie(name_two));
   ASSERT_TRUE(search_result);
   ASSERT_THAT(search_result.value().entry, NotNull());
@@ -770,9 +773,10 @@
   result_overlayable = search_result.value().entry->overlayable_item.value();
   EXPECT_EQ(result_overlayable.overlayable->name, "TestName");
   EXPECT_EQ(result_overlayable.overlayable->actor, "overlay://theme");
-  EXPECT_EQ(result_overlayable.policies, OverlayableItem::Policy::kSystem
-                                         | OverlayableItem::Policy::kProduct
+  EXPECT_EQ(result_overlayable.policies, OverlayableItem::Policy::kOdm
+                                         | OverlayableItem::Policy::kOem
                                          | OverlayableItem::Policy::kVendor);
+
   search_result = output_table.FindResource(test::ParseNameOrDie(name_three));
   ASSERT_TRUE(search_result);
   ASSERT_THAT(search_result.value().entry, NotNull());
diff --git a/tools/aapt2/format/proto/ProtoDeserialize.cpp b/tools/aapt2/format/proto/ProtoDeserialize.cpp
index 06f1bf7..bb21c1c 100644
--- a/tools/aapt2/format/proto/ProtoDeserialize.cpp
+++ b/tools/aapt2/format/proto/ProtoDeserialize.cpp
@@ -393,6 +393,12 @@
       case pb::OverlayableItem::SIGNATURE:
         out_overlayable->policies |= OverlayableItem::Policy::kSignature;
         break;
+      case pb::OverlayableItem::ODM:
+        out_overlayable->policies |= OverlayableItem::Policy::kOdm;
+        break;
+      case pb::OverlayableItem::OEM:
+        out_overlayable->policies |= OverlayableItem::Policy::kOem;
+        break;
       default:
         *out_error = "unknown overlayable policy";
         return false;
diff --git a/tools/aapt2/format/proto/ProtoSerialize.cpp b/tools/aapt2/format/proto/ProtoSerialize.cpp
index eb2b1a2..58e1e6e 100644
--- a/tools/aapt2/format/proto/ProtoSerialize.cpp
+++ b/tools/aapt2/format/proto/ProtoSerialize.cpp
@@ -312,6 +312,12 @@
   if (overlayable_item.policies & OverlayableItem::Policy::kSignature) {
     pb_overlayable_item->add_policy(pb::OverlayableItem::SIGNATURE);
   }
+  if (overlayable_item.policies & OverlayableItem::Policy::kOdm) {
+    pb_overlayable_item->add_policy(pb::OverlayableItem::ODM);
+  }
+  if (overlayable_item.policies & OverlayableItem::Policy::kOem) {
+    pb_overlayable_item->add_policy(pb::OverlayableItem::OEM);
+  }
 
   SerializeSourceToPb(overlayable_item.source, source_pool,
                       pb_overlayable_item->mutable_source());
diff --git a/tools/aapt2/format/proto/ProtoSerialize_test.cpp b/tools/aapt2/format/proto/ProtoSerialize_test.cpp
index d369ac4..f252f33 100644
--- a/tools/aapt2/format/proto/ProtoSerialize_test.cpp
+++ b/tools/aapt2/format/proto/ProtoSerialize_test.cpp
@@ -529,6 +529,8 @@
   OverlayableItem overlayable_item_boz(std::make_shared<Overlayable>(
       "IconPack", "overlay://theme"));
   overlayable_item_boz.policies |= OverlayableItem::Policy::kSignature;
+  overlayable_item_boz.policies |= OverlayableItem::Policy::kOdm;
+  overlayable_item_boz.policies |= OverlayableItem::Policy::kOem;
 
   OverlayableItem overlayable_item_biz(std::make_shared<Overlayable>(
       "Other", "overlay://customization"));
@@ -587,7 +589,9 @@
   overlayable_item = search_result.value().entry->overlayable_item.value();
   EXPECT_THAT(overlayable_item.overlayable->name, Eq("IconPack"));
   EXPECT_THAT(overlayable_item.overlayable->actor, Eq("overlay://theme"));
-  EXPECT_THAT(overlayable_item.policies, Eq(OverlayableItem::Policy::kSignature));
+  EXPECT_THAT(overlayable_item.policies, Eq(OverlayableItem::Policy::kSignature
+                                            | OverlayableItem::Policy::kOdm
+                                            | OverlayableItem::Policy::kOem));
 
   search_result = new_table.FindResource(test::ParseNameOrDie("com.app.a:bool/biz"));
   ASSERT_TRUE(search_result);