diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 0add9c3..e9eb2ef 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -23,7 +23,6 @@
     "apex",
     "linkerconfig",
     "second_stage_resources",
-    "postinstall",
 ]
 
 microdroid_symlinks = [
diff --git a/microdroid/README.md b/microdroid/README.md
index 6d3491c..802e847 100644
--- a/microdroid/README.md
+++ b/microdroid/README.md
@@ -7,7 +7,7 @@
 
 ## Prerequisites
 
-Any 64-bit target (either x86_64 or arm64) is supported. 32-bit target is not
+Any 64-bit target (either x86\_64 or arm64) is supported. 32-bit target is not
 supported. Note that we currently don't support user builds; only userdebug
 builds are supported.
 
@@ -39,7 +39,7 @@
 adb reboot
 ```
 
-If your target is x86_64 (e.g. `aosp_cf_x86_64_phone`), replace `aosp_arm64`
+If your target is x86\_64 (e.g. `aosp_cf_x86_64_phone`), replace `aosp_arm64`
 with `aosp_x86_64`.
 
 ## Building an app
@@ -72,7 +72,7 @@
   "os": {"name": "microdroid"},
   "task": {
     "type": "microdroid_launcher",
-    "command": "MyMicrodroidApp.so",
+    "command": "MyMicrodroidApp.so"
   },
   "apexes": [
     {"name": "com.android.adbd"},
@@ -107,9 +107,9 @@
 Finally, you build and sign the APK.
 
 ```sh
-TARGET_BUILD_APPS=MyMicrodroidApp m dist
+TARGET_BUILD_APPS=MyApp m dist
 m apksigner
-apksigner sign --ks path_to_keystore out/dist/MyMicrodroidApp.apk
+apksigner sign --ks path_to_keystore out/dist/MyApp.apk
 ```
 
 `path_to_keystore` should be replaced with the actual path to the keystore,
@@ -127,7 +127,7 @@
 First of all, install the signed APK to the target device.
 
 ```sh
-adb install out/dist/MyMicrodroidApp.apk
+adb install out/dist/MyApp.apk
 ```
 
 ### Creating `payload.img` manually (temporary step)
@@ -148,8 +148,9 @@
     "com.android.sdkext"
   ],
   "apk": {
-    "name": "PACKAGE_NAME_OF_YOUR_APP"
+    "name": "PACKAGE_NAME_OF_YOUR_APP",
     "path": "PATH_TO_YOUR_APP",
+    "idsig_path": "PATH_TO_APK_IDSIG"
   }
 }
 ```
@@ -169,12 +170,16 @@
 It shall report a cryptic path similar to
 `/data/app/~~OgZq==/com.acme.app-HudMahQ==/base.apk`.
 
+* `PATH_TO_APK_IDSIG`: path to the pushed APK idsig on the device. See below
+  `adb push` command: it will be `/data/local/tmp/virt/MyApp.apk.idsig` in this
+  example.
+
 Once the file is done, execute the following command to push it to the device
 and run `mk_payload` to create `payload.img`:
 
 ```sh
 TEST_ROOT=/data/local/tmp/virt
-adb push out/dist/MyMicrodroidApp.apk.idsig $TEST_ROOT/MyMicrodroidApp.apk.idsig
+adb push out/dist/MyApp.apk.idsig $TEST_ROOT/MyApp.apk.idsig
 adb push path_to_payload.json $TEST_ROOT/payload.json
 adb shell /apex/com.android.virt/bin/my_payload $TEST_ROOT/payload.json $TEST_ROOT/payload.img
 adb shell chmod go+r $TEST_ROOT/payload*
diff --git a/microdroid/sepolicy/system/private/file_contexts b/microdroid/sepolicy/system/private/file_contexts
index c4b4b2c..7e6048e 100644
--- a/microdroid/sepolicy/system/private/file_contexts
+++ b/microdroid/sepolicy/system/private/file_contexts
@@ -1,33 +1,19 @@
-# This is a copy of system/sepolicy/private/file_contexts to build microdroid.img.
-# TODO(inseob): Remove unnecessary entries after experiment
-
 ###########################################
 # Root
 /                   u:object_r:rootfs:s0
 
 # Data files
-/adb_keys           u:object_r:adb_keys_file:s0
 /build\.prop        u:object_r:rootfs:s0
-/default\.prop      u:object_r:rootfs:s0
-/fstab\..*          u:object_r:rootfs:s0
 /init\..*           u:object_r:rootfs:s0
-/res(/.*)?          u:object_r:rootfs:s0
-/selinux_version    u:object_r:rootfs:s0
-/ueventd\..*        u:object_r:rootfs:s0
-/verity_key         u:object_r:rootfs:s0
 
 # Executables
 /init               u:object_r:init_exec:s0
-/sbin(/.*)?         u:object_r:rootfs:s0
 
 # For kernel modules
 /lib(/.*)?          u:object_r:rootfs:s0
 
 # Empty directories
 /lost\+found        u:object_r:rootfs:s0
-/acct               u:object_r:cgroup:s0
-/config             u:object_r:rootfs:s0
-/data_mirror        u:object_r:mirror_data_file:s0
 /debug_ramdisk      u:object_r:tmpfs:s0
 /mnt                u:object_r:tmpfs:s0
 /proc               u:object_r:rootfs:s0
@@ -35,170 +21,69 @@
 /sys                u:object_r:sysfs:s0
 /apex               u:object_r:apex_mnt_dir:s0
 
-# Postinstall directories
-/postinstall         u:object_r:postinstall_mnt_dir:s0
-/postinstall/apex    u:object_r:postinstall_apex_mnt_dir:s0
-
 /apex/(\.(bootstrap|default)-)?apex-info-list.xml u:object_r:apex_info_file:s0
 
 # Symlinks
 /bin                u:object_r:rootfs:s0
-/bugreports         u:object_r:rootfs:s0
-/charger            u:object_r:rootfs:s0
 /d                  u:object_r:rootfs:s0
 /etc                u:object_r:rootfs:s0
-/sdcard             u:object_r:rootfs:s0
-
-# SELinux policy files
-/vendor_file_contexts   u:object_r:file_contexts_file:s0
-/nonplat_file_contexts  u:object_r:file_contexts_file:s0
-/plat_file_contexts     u:object_r:file_contexts_file:s0
-/product_file_contexts  u:object_r:file_contexts_file:s0
-/mapping_sepolicy\.cil   u:object_r:sepolicy_file:s0
-/nonplat_sepolicy\.cil   u:object_r:sepolicy_file:s0
-/plat_sepolicy\.cil      u:object_r:sepolicy_file:s0
-/plat_property_contexts  u:object_r:property_contexts_file:s0
-/product_property_contexts  u:object_r:property_contexts_file:s0
-/nonplat_property_contexts  u:object_r:property_contexts_file:s0
-/vendor_property_contexts   u:object_r:property_contexts_file:s0
-/seapp_contexts     u:object_r:seapp_contexts_file:s0
-/nonplat_seapp_contexts     u:object_r:seapp_contexts_file:s0
-/vendor_seapp_contexts      u:object_r:seapp_contexts_file:s0
-/plat_seapp_contexts     u:object_r:seapp_contexts_file:s0
-/sepolicy           u:object_r:sepolicy_file:s0
-/plat_service_contexts   u:object_r:service_contexts_file:s0
-/plat_hwservice_contexts   u:object_r:hwservice_contexts_file:s0
-/plat_keystore2_key_contexts u:object_r:keystore2_key_contexts_file:s0
-/nonplat_service_contexts   u:object_r:nonplat_service_contexts_file:s0
-# Use nonplat_service_contexts_file to allow servicemanager to read it
-# on non full-treble devices.
-/vendor_service_contexts    u:object_r:nonplat_service_contexts_file:s0
-/nonplat_hwservice_contexts   u:object_r:hwservice_contexts_file:s0
-/vendor_hwservice_contexts    u:object_r:hwservice_contexts_file:s0
-/vndservice_contexts   u:object_r:vndservice_contexts_file:s0
 
 ##########################
 # Devices
 #
 /dev(/.*)?		u:object_r:device:s0
-/dev/adf[0-9]*		u:object_r:graphics_device:s0
-/dev/adf-interface[0-9]*\.[0-9]*	u:object_r:graphics_device:s0
-/dev/adf-overlay-engine[0-9]*\.[0-9]*	u:object_r:graphics_device:s0
 /dev/ashmem		u:object_r:ashmem_device:s0
 /dev/ashmem(.*)?	u:object_r:ashmem_libcutils_device:s0
-/dev/audio.*		u:object_r:audio_device:s0
 /dev/binder		u:object_r:binder_device:s0
 /dev/block(/.*)?	u:object_r:block_device:s0
 /dev/block/dm-[0-9]+	u:object_r:dm_device:s0
 /dev/block/loop[0-9]*	u:object_r:loop_device:s0
 /dev/block/vd[a-z][0-9]*  u:object_r:vd_device:s0
-/dev/block/vold/.+	u:object_r:vold_device:s0
 /dev/block/ram[0-9]*	u:object_r:ram_device:s0
 /dev/block/zram[0-9]*	u:object_r:ram_device:s0
-/dev/boringssl/selftest(/.*)?	u:object_r:boringssl_self_test_marker:s0
-/dev/bus/usb(.*)?       u:object_r:usb_device:s0
 /dev/console		u:object_r:console_device:s0
-/dev/cpu_variant:.*     u:object_r:dev_cpu_variant:s0
 /dev/dma_heap(/.*)?     u:object_r:dmabuf_heap_device:s0
 /dev/dma_heap/system    u:object_r:dmabuf_system_heap_device:s0
 /dev/dma_heap/system-uncached    u:object_r:dmabuf_system_heap_device:s0
 /dev/dma_heap/system-secure(.*)	 u:object_r:dmabuf_system_secure_heap_device:s0
 /dev/dm-user(/.*)?	u:object_r:dm_user_device:s0
 /dev/device-mapper	u:object_r:dm_device:s0
-/dev/eac		u:object_r:audio_device:s0
 /dev/event-log-tags     u:object_r:runtime_event_log_tags_file:s0
 /dev/cgroup_info(/.*)?  u:object_r:cgroup_rc_file:s0
-/dev/fscklogs(/.*)?	u:object_r:fscklogs:s0
 /dev/fuse		u:object_r:fuse_device:s0
-/dev/gnss[0-9]+		u:object_r:gnss_device:s0
-/dev/graphics(/.*)?	u:object_r:graphics_device:s0
 /dev/hw_random		u:object_r:hw_random_device:s0
 /dev/hwbinder		u:object_r:hwbinder_device:s0
-/dev/input(/.*)?	u:object_r:input_device:s0
-/dev/iio:device[0-9]+   u:object_r:iio_device:s0
-/dev/ion		u:object_r:ion_device:s0
-/dev/keychord   u:object_r:keychord_device:s0
 /dev/loop-control	u:object_r:loop_control_device:s0
-/dev/modem.*		u:object_r:radio_device:s0
-/dev/mtp_usb		u:object_r:mtp_device:s0
-/dev/pmsg0		u:object_r:pmsg_device:s0
-/dev/pn544		u:object_r:nfc_device:s0
-/dev/port		u:object_r:port_device:s0
 /dev/ppp		u:object_r:ppp_device:s0
 /dev/ptmx		u:object_r:ptmx_device:s0
-/dev/pvrsrvkm		u:object_r:gpu_device:s0
 /dev/kmsg		u:object_r:kmsg_device:s0
 /dev/kmsg_debug	u:object_r:kmsg_debug_device:s0
 /dev/kvm		u:object_r:kvm_device:s0
 /dev/null		u:object_r:null_device:s0
-/dev/nvhdcp1		u:object_r:video_device:s0
 /dev/random		u:object_r:random_device:s0
-/dev/rpmsg-omx[0-9]	u:object_r:rpmsg_device:s0
-/dev/rproc_user	u:object_r:rpmsg_device:s0
 /dev/rtc[0-9]      u:object_r:rtc_device:s0
-/dev/snd(/.*)?		u:object_r:audio_device:s0
 /dev/socket(/.*)?	u:object_r:socket_device:s0
 /dev/socket/adbd	u:object_r:adbd_socket:s0
-/dev/socket/dnsproxyd	u:object_r:dnsproxyd_socket:s0
 /dev/socket/dumpstate	u:object_r:dumpstate_socket:s0
-/dev/socket/fwmarkd	u:object_r:fwmarkd_socket:s0
-/dev/socket/lmkd        u:object_r:lmkd_socket:s0
 /dev/socket/logd	u:object_r:logd_socket:s0
 /dev/socket/logdr	u:object_r:logdr_socket:s0
 /dev/socket/logdw	u:object_r:logdw_socket:s0
-/dev/socket/statsdw	u:object_r:statsdw_socket:s0
-/dev/socket/mdns	u:object_r:mdns_socket:s0
-/dev/socket/mdnsd	u:object_r:mdnsd_socket:s0
-/dev/socket/mtpd	u:object_r:mtpd_socket:s0
-/dev/socket/pdx/system/buffer_hub	u:object_r:pdx_bufferhub_dir:s0
-/dev/socket/pdx/system/buffer_hub/client	u:object_r:pdx_bufferhub_client_endpoint_socket:s0
-/dev/socket/pdx/system/performance	u:object_r:pdx_performance_dir:s0
-/dev/socket/pdx/system/performance/client	u:object_r:pdx_performance_client_endpoint_socket:s0
-/dev/socket/pdx/system/vr/display	u:object_r:pdx_display_dir:s0
-/dev/socket/pdx/system/vr/display/client	u:object_r:pdx_display_client_endpoint_socket:s0
-/dev/socket/pdx/system/vr/display/manager	u:object_r:pdx_display_manager_endpoint_socket:s0
-/dev/socket/pdx/system/vr/display/screenshot	u:object_r:pdx_display_screenshot_endpoint_socket:s0
-/dev/socket/pdx/system/vr/display/vsync	u:object_r:pdx_display_vsync_endpoint_socket:s0
 /dev/socket/property_service	u:object_r:property_socket:s0
-/dev/socket/racoon	u:object_r:racoon_socket:s0
-/dev/socket/recovery    u:object_r:recovery_socket:s0
-/dev/socket/rild	u:object_r:rild_socket:s0
-/dev/socket/rild-debug	u:object_r:rild_debug_socket:s0
-/dev/socket/snapuserd u:object_r:snapuserd_socket:s0
 /dev/socket/tombstoned_crash u:object_r:tombstoned_crash_socket:s0
 /dev/socket/tombstoned_java_trace u:object_r:tombstoned_java_trace_socket:s0
 /dev/socket/tombstoned_intercept u:object_r:tombstoned_intercept_socket:s0
-/dev/socket/traced_consumer	u:object_r:traced_consumer_socket:s0
-/dev/socket/traced_perf	u:object_r:traced_perf_socket:s0
-/dev/socket/traced_producer	u:object_r:traced_producer_socket:s0
-/dev/socket/heapprofd	u:object_r:heapprofd_socket:s0
-/dev/socket/uncrypt	u:object_r:uncrypt_socket:s0
-/dev/socket/wpa_eth[0-9] u:object_r:wpa_socket:s0
-/dev/socket/wpa_wlan[0-9] u:object_r:wpa_socket:s0
-/dev/socket/zygote	u:object_r:zygote_socket:s0
-/dev/socket/zygote_secondary	u:object_r:zygote_socket:s0
-/dev/socket/usap_pool_primary	u:object_r:zygote_socket:s0
-/dev/socket/usap_pool_secondary	u:object_r:zygote_socket:s0
-/dev/spdif_out.*	u:object_r:audio_device:s0
 /dev/sys/block/by-name/userdata(/.*)?	u:object_r:userdata_sysdev:s0
 /dev/sys/fs/by-name/userdata(/.*)?	u:object_r:userdata_sysdev:s0
 /dev/tty		u:object_r:owntty_device:s0
 /dev/tty[0-9]*		u:object_r:tty_device:s0
 /dev/ttyS[0-9]*		u:object_r:serial_device:s0
-/dev/ttyUSB[0-9]*	u:object_r:usb_serial_device:s0
-/dev/ttyACM[0-9]*	u:object_r:usb_serial_device:s0
 /dev/tun		u:object_r:tun_device:s0
 /dev/uhid		u:object_r:uhid_device:s0
 /dev/uinput		u:object_r:uhid_device:s0
 /dev/uio[0-9]*		u:object_r:uio_device:s0
 /dev/urandom		u:object_r:random_device:s0
-/dev/usb_accessory	u:object_r:usbaccessory_device:s0
-/dev/v4l-touch[0-9]*	u:object_r:input_device:s0
 /dev/vhost-vsock	u:object_r:kvm_device:s0
-/dev/video[0-9]*	u:object_r:video_device:s0
 /dev/vndbinder		u:object_r:vndbinder_device:s0
-/dev/watchdog		u:object_r:watchdog_device:s0
-/dev/xt_qtaguid	u:object_r:qtaguid_device:s0
 /dev/zero		u:object_r:zero_device:s0
 /dev/__properties__ u:object_r:properties_device:s0
 /dev/__properties__/property_info   u:object_r:property_info:s0
@@ -209,134 +94,29 @@
 #############################
 # System files
 #
-/system(/.*)?		u:object_r:system_file:s0
-/system/apex/com.android.art	u:object_r:art_apex_dir:s0
-/system/lib(64)?(/.*)?		u:object_r:system_lib_file:s0
+/system(/.*)?          u:object_r:system_file:s0
+/system/lib(64)?(/.*)?         u:object_r:system_lib_file:s0
 /system/lib(64)?/bootstrap(/.*)? u:object_r:system_bootstrap_lib_file:s0
-/system/bin/mm_events		u:object_r:mm_events_exec:s0
-/system/bin/atrace	u:object_r:atrace_exec:s0
-/system/bin/auditctl	u:object_r:auditctl_exec:s0
-/system/bin/bcc                 u:object_r:rs_exec:s0
-/system/bin/blank_screen	u:object_r:blank_screen_exec:s0
-/system/bin/boringssl_self_test(32|64) u:object_r:boringssl_self_test_exec:s0
-/system/bin/charger		u:object_r:charger_exec:s0
-/system/bin/canhalconfigurator  u:object_r:canhalconfigurator_exec:s0
-/system/bin/e2fsdroid		u:object_r:e2fs_exec:s0
-/system/bin/mke2fs		u:object_r:e2fs_exec:s0
-/system/bin/e2fsck	--	u:object_r:fsck_exec:s0
-/system/bin/fsck\.exfat	--	u:object_r:fsck_exec:s0
-/system/bin/fsck\.f2fs	--	u:object_r:fsck_exec:s0
-/system/bin/init		u:object_r:init_exec:s0
-# TODO(/123600489): merge mini-keyctl into toybox
-/system/bin/mini-keyctl	--	u:object_r:toolbox_exec:s0
-/system/bin/fsverity_init	u:object_r:fsverity_init_exec:s0
-/system/bin/sload_f2fs	--	u:object_r:e2fs_exec:s0
-/system/bin/make_f2fs	--	u:object_r:e2fs_exec:s0
-/system/bin/fsck_msdos	--	u:object_r:fsck_exec:s0
-/system/bin/tcpdump	--	u:object_r:tcpdump_exec:s0
-/system/bin/tune2fs	--	u:object_r:fsck_exec:s0
-/system/bin/resize2fs	--	u:object_r:fsck_exec:s0
-/system/bin/toolbox	--	u:object_r:toolbox_exec:s0
-/system/bin/toybox	--	u:object_r:toolbox_exec:s0
-/system/bin/ld\.mc              u:object_r:rs_exec:s0
-/system/bin/logcat	--	u:object_r:logcat_exec:s0
-/system/bin/logcatd	--	u:object_r:logcat_exec:s0
-/system/bin/sh		--	u:object_r:shell_exec:s0
-/system/bin/run-as	--	u:object_r:runas_exec:s0
-/system/bin/bootanimation u:object_r:bootanim_exec:s0
-/system/bin/bootstat		u:object_r:bootstat_exec:s0
-/system/bin/app_process32	u:object_r:zygote_exec:s0
-/system/bin/app_process64	u:object_r:zygote_exec:s0
-/system/bin/servicemanager	u:object_r:servicemanager_exec:s0
-/system/bin/hwservicemanager	u:object_r:hwservicemanager_exec:s0
-/system/bin/surfaceflinger	u:object_r:surfaceflinger_exec:s0
-/system/bin/gpuservice	u:object_r:gpuservice_exec:s0
-/system/bin/bufferhubd	u:object_r:bufferhubd_exec:s0
-/system/bin/performanced	u:object_r:performanced_exec:s0
-/system/bin/drmserver	u:object_r:drmserver_exec:s0
-/system/bin/dumpstate   u:object_r:dumpstate_exec:s0
-/system/bin/incident   u:object_r:incident_exec:s0
-/system/bin/incidentd   u:object_r:incidentd_exec:s0
-/system/bin/incident_helper  u:object_r:incident_helper_exec:s0
-/system/bin/iw                   u:object_r:iw_exec:s0
-/system/bin/netutils-wrapper-1\.0    u:object_r:netutils_wrapper_exec:s0
-/system/bin/vold	u:object_r:vold_exec:s0
-/system/bin/netd	u:object_r:netd_exec:s0
-/system/bin/wificond	u:object_r:wificond_exec:s0
-/system/bin/audioserver	u:object_r:audioserver_exec:s0
-/system/bin/mediadrmserver	u:object_r:mediadrmserver_exec:s0
-/system/bin/mediaserver	u:object_r:mediaserver_exec:s0
-/system/bin/mediametrics	u:object_r:mediametrics_exec:s0
-/system/bin/cameraserver	u:object_r:cameraserver_exec:s0
-/system/bin/mediaextractor	u:object_r:mediaextractor_exec:s0
-/system/bin/mediaswcodec	u:object_r:mediaswcodec_exec:s0
-/system/bin/mediatranscoding	u:object_r:mediatranscoding_exec:s0
-/system/bin/mediatuner	        u:object_r:mediatuner_exec:s0
-/system/bin/mdnsd	u:object_r:mdnsd_exec:s0
-/system/bin/installd	u:object_r:installd_exec:s0
-/system/bin/otapreopt_chroot   u:object_r:otapreopt_chroot_exec:s0
-/system/bin/otapreopt_slot   u:object_r:otapreopt_slot_exec:s0
-/system/bin/credstore	u:object_r:credstore_exec:s0
-/system/bin/keystore	u:object_r:keystore_exec:s0
-/system/bin/keystore2	u:object_r:keystore_exec:s0
-/system/bin/fingerprintd u:object_r:fingerprintd_exec:s0
-/system/bin/gatekeeperd u:object_r:gatekeeperd_exec:s0
-/system/bin/tombstoned u:object_r:tombstoned_exec:s0
-/system/bin/recovery-persist     u:object_r:recovery_persist_exec:s0
-/system/bin/recovery-refresh     u:object_r:recovery_refresh_exec:s0
-/system/bin/sdcard      u:object_r:sdcardd_exec:s0
-/system/bin/snapshotctl      u:object_r:snapshotctl_exec:s0
-/system/bin/dhcpcd      u:object_r:dhcp_exec:s0
-/system/bin/dhcpcd-6\.8\.2	u:object_r:dhcp_exec:s0
-/system/bin/mtpd	u:object_r:mtp_exec:s0
-/system/bin/pppd	u:object_r:ppp_exec:s0
-/system/bin/racoon	u:object_r:racoon_exec:s0
-/system/xbin/su		u:object_r:su_exec:s0
-/system/bin/dnsmasq     u:object_r:dnsmasq_exec:s0
-/system/bin/healthd     u:object_r:healthd_exec:s0
-/system/bin/clatd	u:object_r:clatd_exec:s0
+/system/bin/apexd                u:object_r:apexd_exec:s0
 /system/bin/linker(64)? u:object_r:system_linker_exec:s0
 /system/bin/linkerconfig u:object_r:linkerconfig_exec:s0
 /system/bin/bootstrap/linker(64)? u:object_r:system_linker_exec:s0
 /system/bin/bootstrap/linkerconfig u:object_r:linkerconfig_exec:s0
-/system/bin/llkd        u:object_r:llkd_exec:s0
-/system/bin/lmkd        u:object_r:lmkd_exec:s0
-/system/bin/usbd   u:object_r:usbd_exec:s0
-/system/bin/inputflinger u:object_r:inputflinger_exec:s0
+/system/bin/servicemanager	u:object_r:servicemanager_exec:s0
+/system/bin/hwservicemanager	u:object_r:hwservicemanager_exec:s0
+/system/bin/init		u:object_r:init_exec:s0
+/system/bin/keystore2	u:object_r:keystore_exec:s0
+/system/bin/logcat	--	u:object_r:logcat_exec:s0
 /system/bin/logd        u:object_r:logd_exec:s0
-/system/bin/lpdumpd        u:object_r:lpdumpd_exec:s0
-/system/bin/rss_hwm_reset	u:object_r:rss_hwm_reset_exec:s0
-/system/bin/perfetto        u:object_r:perfetto_exec:s0
-/system/bin/traced        u:object_r:traced_exec:s0
-/system/bin/traced_perf        u:object_r:traced_perf_exec:s0
-/system/bin/traced_probes        u:object_r:traced_probes_exec:s0
-/system/bin/heapprofd        u:object_r:heapprofd_exec:s0
-/system/bin/uncrypt     u:object_r:uncrypt_exec:s0
-/system/bin/update_verifier u:object_r:update_verifier_exec:s0
-/system/bin/logwrapper  u:object_r:system_file:s0
-/system/bin/vdc         u:object_r:vdc_exec:s0
-/system/bin/cppreopts\.sh   u:object_r:cppreopts_exec:s0
-/system/bin/preloads_copy\.sh u:object_r:preloads_copy_exec:s0
-/system/bin/preopt2cachename u:object_r:preopt2cachename_exec:s0
-/system/bin/viewcompiler     u:object_r:viewcompiler_exec:s0
-/system/bin/iorapd          u:object_r:iorapd_exec:s0
-/system/bin/iorap\.inode2filename u:object_r:iorap_inode2filename_exec:s0
-/system/bin/iorap\.prefetcherd u:object_r:iorap_prefetcherd_exec:s0
-/system/bin/sgdisk      u:object_r:sgdisk_exec:s0
-/system/bin/blkid       u:object_r:blkid_exec:s0
-/system/bin/tzdatacheck u:object_r:tzdatacheck_exec:s0
-/system/bin/flags_health_check -- u:object_r:flags_health_check_exec:s0
-/system/bin/idmap u:object_r:idmap_exec:s0
-/system/bin/idmap2(d)?           u:object_r:idmap_exec:s0
-/system/bin/update_engine        u:object_r:update_engine_exec:s0
-/system/bin/profcollectd         u:object_r:profcollectd_exec:s0
-/system/bin/profcollectctl       u:object_r:profcollectd_exec:s0
-/system/bin/storaged             u:object_r:storaged_exec:s0
-/system/bin/wpantund             u:object_r:wpantund_exec:s0
-/system/bin/virtual_touchpad     u:object_r:virtual_touchpad_exec:s0
-/system/bin/hw/android\.frameworks\.bufferhub@1\.0-service    u:object_r:fwk_bufferhub_exec:s0
-/system/bin/hw/android\.hidl\.allocator@1\.0-service          u:object_r:hal_allocator_default_exec:s0
-/system/bin/hw/android\.system\.suspend@1\.0-service          u:object_r:system_suspend_exec:s0
+/system/bin/run-as	--	u:object_r:runas_exec:s0
+/system/bin/sh		--	u:object_r:shell_exec:s0
+/system/bin/tombstoned u:object_r:tombstoned_exec:s0
+/system/bin/toolbox	--	u:object_r:toolbox_exec:s0
+/system/bin/toybox	--	u:object_r:toolbox_exec:s0
+/system/bin/zipfuse              u:object_r:zipfuse_exec:s0
+/system/bin/microdroid_launcher  u:object_r:microdroid_launcher_exec:s0
+/system/bin/microdroid_manager   u:object_r:microdroid_manager_exec:s0
+/system/bin/apkdmverity          u:object_r:apkdmverity_exec:s0
 /system/etc/cgroups\.json               u:object_r:cgroup_desc_file:s0
 /system/etc/task_profiles/cgroups_[0-9]+\.json               u:object_r:cgroup_desc_api_file:s0
 /system/etc/event-log-tags              u:object_r:system_event_log_tags_file:s0
@@ -357,154 +137,13 @@
 /system/etc/selinux/plat_and_mapping_sepolicy\.cil\.sha256 u:object_r:sepolicy_file:s0
 /system/etc/task_profiles\.json  u:object_r:task_profiles_file:s0
 /system/etc/task_profiles/task_profiles_[0-9]+\.json  u:object_r:task_profiles_api_file:s0
-/system/usr/share/zoneinfo(/.*)? u:object_r:system_zoneinfo_file:s0
-/system/bin/vr_hwc               u:object_r:vr_hwc_exec:s0
-/system/bin/adbd                 u:object_r:adbd_exec:s0
-/system/bin/vold_prepare_subdirs u:object_r:vold_prepare_subdirs_exec:s0
-/system/bin/stats                u:object_r:stats_exec:s0
-/system/bin/statsd               u:object_r:statsd_exec:s0
-/system/bin/bpfloader            u:object_r:bpfloader_exec:s0
-/system/bin/watchdogd            u:object_r:watchdogd_exec:s0
-/system/bin/apexd                u:object_r:apexd_exec:s0
-/system/bin/gsid                 u:object_r:gsid_exec:s0
-/system/bin/simpleperf           u:object_r:simpleperf_exec:s0
-/system/bin/simpleperf_app_runner    u:object_r:simpleperf_app_runner_exec:s0
-/system/bin/migrate_legacy_obb_data\.sh u:object_r:migrate_legacy_obb_data_exec:s0
-/system/bin/android\.frameworks\.automotive\.display@1\.0-service u:object_r:automotive_display_service_exec:s0
-/system/bin/snapuserd            u:object_r:snapuserd_exec:s0
-/system/bin/odsign               u:object_r:odsign_exec:s0
-/system/bin/zipfuse              u:object_r:zipfuse_exec:s0
-/system/bin/microdroid_launcher  u:object_r:microdroid_launcher_exec:s0
-/system/bin/microdroid_manager   u:object_r:microdroid_manager_exec:s0
-/system/bin/apkdmverity          u:object_r:apkdmverity_exec:s0
 
 #############################
 # Vendor files
 #
-/(vendor|system/vendor)(/.*)?                  u:object_r:vendor_file:s0
-/(vendor|system/vendor)/bin/sh                 u:object_r:vendor_shell_exec:s0
-/(vendor|system/vendor)/bin/toybox_vendor      u:object_r:vendor_toolbox_exec:s0
-/(vendor|system/vendor)/bin/toolbox            u:object_r:vendor_toolbox_exec:s0
-/(vendor|system/vendor)/etc(/.*)?              u:object_r:vendor_configs_file:s0
-/(vendor|system/vendor)/etc/cgroups\.json      u:object_r:vendor_cgroup_desc_file:s0
-/(vendor|system/vendor)/etc/task_profiles\.json    u:object_r:vendor_task_profiles_file:s0
-
-/(vendor|system/vendor)/lib(64)?/egl(/.*)?     u:object_r:same_process_hal_file:s0
-
-/(vendor|system/vendor)/lib(64)?/vndk-sp(/.*)? u:object_r:vndk_sp_file:s0
-
-/(vendor|system/vendor)/manifest\.xml           u:object_r:vendor_configs_file:s0
-/(vendor|system/vendor)/compatibility_matrix\.xml u:object_r:vendor_configs_file:s0
-/(vendor|system/vendor)/etc/vintf(/.*)?        u:object_r:vendor_configs_file:s0
-/(vendor|system/vendor)/app(/.*)?              u:object_r:vendor_app_file:s0
-/(vendor|system/vendor)/priv-app(/.*)?         u:object_r:vendor_app_file:s0
-/(vendor|system/vendor)/overlay(/.*)?          u:object_r:vendor_overlay_file:s0
-/(vendor|system/vendor)/framework(/.*)?        u:object_r:vendor_framework_file:s0
-
-/(vendor|system/vendor)/apex(/[^/]+){0,2}                      u:object_r:vendor_apex_file:s0
-/(vendor|system/vendor)/bin/misc_writer                        u:object_r:vendor_misc_writer_exec:s0
-/(vendor|system/vendor)/bin/boringssl_self_test(32|64)         u:object_r:vendor_boringssl_self_test_exec:s0
-
-# HAL location
-/(vendor|system/vendor)/lib(64)?/hw            u:object_r:vendor_hal_file:s0
-
-/(vendor|system/vendor)/etc/selinux/nonplat_service_contexts u:object_r:nonplat_service_contexts_file:s0
-
-/(vendor|system/vendor)/etc/selinux/vendor_service_contexts u:object_r:vendor_service_contexts_file:s0
-
-#############################
-# OEM and ODM files
-#
-/(odm|vendor/odm)(/.*)?                       u:object_r:vendor_file:s0
-/(odm|vendor/odm)/lib(64)?/egl(/.*)?          u:object_r:same_process_hal_file:s0
-/(odm|vendor/odm)/lib(64)?/hw                 u:object_r:vendor_hal_file:s0
-/(odm|vendor/odm)/lib(64)?/vndk-sp(/.*)?      u:object_r:vndk_sp_file:s0
-/(odm|vendor/odm)/bin/sh                      u:object_r:vendor_shell_exec:s0
-/(odm|vendor/odm)/etc(/.*)?                   u:object_r:vendor_configs_file:s0
-/(odm|vendor/odm)/app(/.*)?                   u:object_r:vendor_app_file:s0
-/(odm|vendor/odm)/priv-app(/.*)?              u:object_r:vendor_app_file:s0
-/(odm|vendor/odm)/overlay(/.*)?               u:object_r:vendor_overlay_file:s0
-/(odm|vendor/odm)/framework(/.*)?             u:object_r:vendor_framework_file:s0
-
-# Input configuration
-/(odm|vendor/odm|vendor|system/vendor)/usr/keylayout(/.*)?\.kl        u:object_r:vendor_keylayout_file:s0
-/(odm|vendor/odm|vendor|system/vendor)/usr/keychars(/.*)?\.kcm        u:object_r:vendor_keychars_file:s0
-/(odm|vendor/odm|vendor|system/vendor)/usr/idc(/.*)?\.idc             u:object_r:vendor_idc_file:s0
-
-/oem(/.*)?              u:object_r:oemfs:s0
-/oem/overlay(/.*)?      u:object_r:vendor_overlay_file:s0
-
-# The precompiled monolithic sepolicy will be under /odm only when
-# BOARD_USES_ODMIMAGE is true: a separate odm.img is built.
-/odm/etc/selinux/precompiled_sepolicy                           u:object_r:sepolicy_file:s0
-/odm/etc/selinux/precompiled_sepolicy\.plat_and_mapping\.sha256 u:object_r:sepolicy_file:s0
-
-/(odm|vendor/odm)/etc/selinux/odm_sepolicy\.cil                  u:object_r:sepolicy_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_file_contexts                 u:object_r:file_contexts_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_seapp_contexts                u:object_r:seapp_contexts_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_property_contexts             u:object_r:property_contexts_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_hwservice_contexts            u:object_r:hwservice_contexts_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_keystore2_key_contexts         u:object_r:keystore2_key_contexts_file:s0
-/(odm|vendor/odm)/etc/selinux/odm_mac_permissions\.xml           u:object_r:mac_perms_file:s0
-
-#############################
-# Product files
-#
-/(product|system/product)(/.*)?                                 u:object_r:system_file:s0
-/(product|system/product)/etc/group                             u:object_r:system_group_file:s0
-/(product|system/product)/etc/passwd                            u:object_r:system_passwd_file:s0
-/(product|system/product)/overlay(/.*)?                         u:object_r:vendor_overlay_file:s0
-
-/(product|system/product)/etc/selinux/product_file_contexts      u:object_r:file_contexts_file:s0
-/(product|system/product)/etc/selinux/product_hwservice_contexts u:object_r:hwservice_contexts_file:s0
-/(product|system/product)/etc/selinux/product_keystore2_key_contexts u:object_r:keystore2_key_contexts_file:s0
-/(product|system/product)/etc/selinux/product_property_contexts  u:object_r:property_contexts_file:s0
-/(product|system/product)/etc/selinux/product_seapp_contexts     u:object_r:seapp_contexts_file:s0
-/(product|system/product)/etc/selinux/product_service_contexts   u:object_r:service_contexts_file:s0
-/(product|system/product)/etc/selinux/product_mac_permissions\.xml u:object_r:mac_perms_file:s0
-
-/(product|system/product)/lib(64)?(/.*)?                         u:object_r:system_lib_file:s0
-
-#############################
-# SystemExt files
-#
-/(system_ext|system/system_ext)(/.*)?               u:object_r:system_file:s0
-/(system_ext|system/system_ext)/etc/group           u:object_r:system_group_file:s0
-/(system_ext|system/system_ext)/etc/passwd          u:object_r:system_passwd_file:s0
-/(system_ext|system/system_ext)/overlay(/.*)?       u:object_r:vendor_overlay_file:s0
-
-/(system_ext|system/system_ext)/etc/selinux/system_ext_file_contexts        u:object_r:file_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_hwservice_contexts   u:object_r:hwservice_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_keystore2_key_contexts u:object_r:keystore2_key_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_property_contexts    u:object_r:property_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_seapp_contexts       u:object_r:seapp_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_service_contexts     u:object_r:service_contexts_file:s0
-/(system_ext|system/system_ext)/etc/selinux/system_ext_mac_permissions\.xml u:object_r:mac_perms_file:s0
-
-/(system_ext|system/system_ext)/bin/aidl_lazy_test_server   u:object_r:aidl_lazy_test_server_exec:s0
-/(system_ext|system/system_ext)/bin/hidl_lazy_test_server   u:object_r:hidl_lazy_test_server_exec:s0
-
-/(system_ext|system/system_ext)/lib(64)?(/.*)?      u:object_r:system_lib_file:s0
-
-#############################
-# VendorDlkm files
-# This includes VENDOR Dynamically Loadable Kernel Modules and other misc files.
-#
-/(vendor_dlkm|vendor/vendor_dlkm|system/vendor/vendor_dlkm)(/.*)?         u:object_r:vendor_file:s0
-
-#############################
-# OdmDlkm files
-# This includes ODM Dynamically Loadable Kernel Modules and other misc files.
-#
-/(odm_dlkm|vendor/odm_dlkm|system/vendor/odm_dlkm)(/.*)?                  u:object_r:vendor_file:s0
-
-#############################
-# Vendor files from /(product|system/product)/vendor_overlay
-#
-# NOTE: For additional vendor file contexts for vendor overlay files,
-# use device specific file_contexts.
-#
-/(product|system/product)/vendor_overlay/[0-9]+/.*          u:object_r:vendor_file:s0
+/vendor(/.*)?                  u:object_r:vendor_file:s0
+/vendor/etc(/.*)?              u:object_r:vendor_configs_file:s0
+/vendor/etc/vintf(/.*)?        u:object_r:vendor_configs_file:s0
 
 #############################
 # Data files
@@ -514,305 +153,11 @@
 #
 /data		u:object_r:system_data_root_file:s0
 /data/(.*)?		u:object_r:system_data_file:s0
-/data/system/environ(/.*)? u:object_r:environ_system_data_file:s0
-/data/system/packages\.list u:object_r:packages_list_file:s0
-/data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
-/data/backup(/.*)?		u:object_r:backup_data_file:s0
-/data/secure/backup(/.*)?	u:object_r:backup_data_file:s0
-/data/system/ndebugsocket	u:object_r:system_ndebug_socket:s0
-/data/system/unsolzygotesocket  u:object_r:system_unsolzygote_socket:s0
-/data/drm(/.*)?		u:object_r:drm_data_file:s0
-/data/resource-cache(/.*)? u:object_r:resourcecache_data_file:s0
-/data/dalvik-cache(/.*)? u:object_r:dalvikcache_data_file:s0
-/data/ota(/.*)? u:object_r:ota_data_file:s0
-/data/ota_package(/.*)? u:object_r:ota_package_file:s0
-/data/adb(/.*)?		u:object_r:adb_data_file:s0
 /data/anr(/.*)?		u:object_r:anr_data_file:s0
-/data/apex(/.*)?		u:object_r:apex_data_file:s0
-/data/apex/active/(.*)?		u:object_r:staging_data_file:s0
-/data/apex/backup/(.*)?		u:object_r:staging_data_file:s0
-/data/apex/decompressed/(.*)?    u:object_r:staging_data_file:s0
-/data/apex/ota_reserved(/.*)?       u:object_r:apex_ota_reserved_file:s0
-/data/app(/.*)?                       u:object_r:apk_data_file:s0
-# Traditional /data/app/[packageName]-[randomString]/base.apk location
-/data/app/[^/]+/oat(/.*)?                u:object_r:dalvikcache_data_file:s0
-# /data/app/[randomStringA]/[packageName]-[randomStringB]/base.apk layout
-/data/app/[^/]+/[^/]+/oat(/.*)?                u:object_r:dalvikcache_data_file:s0
-/data/app/vmdl[^/]+\.tmp(/.*)?           u:object_r:apk_tmp_file:s0
-/data/app/vmdl[^/]+\.tmp/oat(/.*)?           u:object_r:dalvikcache_data_file:s0
-/data/app-private(/.*)?               u:object_r:apk_private_data_file:s0
-/data/app-private/vmdl.*\.tmp(/.*)?   u:object_r:apk_private_tmp_file:s0
-/data/gsi(/.*)?        u:object_r:gsi_data_file:s0
-/data/gsi_persistent_data    u:object_r:gsi_persistent_data_file:s0
-/data/gsi/ota(/.*)?    u:object_r:ota_image_data_file:s0
-/data/tombstones(/.*)?	u:object_r:tombstone_data_file:s0
-/data/vendor/tombstones/wifi(/.*)? u:object_r:tombstone_wifi_data_file:s0
 /data/local/tests(/.*)?	u:object_r:shell_test_data_file:s0
 /data/local/tmp(/.*)?	u:object_r:shell_data_file:s0
 /data/local/tmp/ltp(/.*)?   u:object_r:nativetest_data_file:s0
 /data/local/traces(/.*)?	u:object_r:trace_data_file:s0
-/data/media(/.*)?	u:object_r:media_rw_data_file:s0
-/data/mediadrm(/.*)?	u:object_r:media_data_file:s0
-/data/nativetest(/.*)?	u:object_r:nativetest_data_file:s0
-/data/nativetest64(/.*)?	u:object_r:nativetest_data_file:s0
-# This directory was removed after Q Beta 2, but we need to preserve labels for upgrading devices.
-/data/pkg_staging(/.*)?		u:object_r:staging_data_file:s0
-/data/property(/.*)?	u:object_r:property_data_file:s0
-/data/preloads(/.*)?	u:object_r:preloads_data_file:s0
-/data/preloads/media(/.*)?	u:object_r:preloads_media_file:s0
-/data/preloads/demo(/.*)?	u:object_r:preloads_media_file:s0
-/data/server_configurable_flags(/.*)? u:object_r:server_configurable_flags_data_file:s0
-/data/app-staging(/.*)?		u:object_r:staging_data_file:s0
-# Ensure we have the same labels as /data/app or /data/apex/active
-# to avoid restorecon conflicts
-/data/rollback/\d+/[^/]+/.*\.apk  u:object_r:apk_data_file:s0
-/data/rollback/\d+/[^/]+/.*\.apex u:object_r:staging_data_file:s0
-/data/fonts/files(/.*)?     u:object_r:font_data_file:s0
-
-# Misc data
-/data/misc/adb(/.*)?            u:object_r:adb_keys_file:s0
-/data/misc/a11ytrace(/.*)?      u:object_r:accessibility_trace_data_file:s0
-/data/misc/apexdata(/.*)?       u:object_r:apex_module_data_file:s0
-/data/misc/apexdata/com\.android\.art(/.*)?           u:object_r:apex_art_data_file:s0
-/data/misc/apexdata/com\.android\.permission(/.*)?    u:object_r:apex_permission_data_file:s0
-/data/misc/apexdata/com\.android\.scheduling(/.*)?    u:object_r:apex_scheduling_data_file:s0
-/data/misc/apexdata/com\.android\.wifi(/.*)?          u:object_r:apex_wifi_data_file:s0
-/data/misc/apexrollback(/.*)?   u:object_r:apex_rollback_data_file:s0
-/data/misc/apns(/.*)?           u:object_r:radio_data_file:s0
-/data/misc/appcompat(/.*)?      u:object_r:appcompat_data_file:s0
-/data/misc/audio(/.*)?          u:object_r:audio_data_file:s0
-/data/misc/audioserver(/.*)?    u:object_r:audioserver_data_file:s0
-/data/misc/audiohal(/.*)?       u:object_r:audiohal_data_file:s0
-/data/misc/bootstat(/.*)?       u:object_r:bootstat_data_file:s0
-/data/misc/boottrace(/.*)?      u:object_r:boottrace_data_file:s0
-/data/misc/bluetooth(/.*)?      u:object_r:bluetooth_data_file:s0
-/data/misc/bluetooth/logs(/.*)? u:object_r:bluetooth_logs_data_file:s0
-/data/misc/bluedroid(/.*)?      u:object_r:bluetooth_data_file:s0
-/data/misc/bluedroid/\.a2dp_ctrl u:object_r:bluetooth_socket:s0
-/data/misc/bluedroid/\.a2dp_data u:object_r:bluetooth_socket:s0
-/data/misc/camera(/.*)?         u:object_r:camera_data_file:s0
-/data/misc/carrierid(/.*)?      u:object_r:radio_data_file:s0
-/data/misc/dhcp(/.*)?           u:object_r:dhcp_data_file:s0
-/data/misc/dhcp-6\.8\.2(/.*)?     u:object_r:dhcp_data_file:s0
-/data/misc/emergencynumberdb(/.*)?     u:object_r:emergency_data_file:s0
-/data/misc/gatekeeper(/.*)?     u:object_r:gatekeeper_data_file:s0
-/data/misc/incidents(/.*)?	    u:object_r:incident_data_file:s0
-/data/misc/installd(/.*)?		u:object_r:install_data_file:s0
-/data/misc/keychain(/.*)?       u:object_r:keychain_data_file:s0
-/data/misc/credstore(/.*)?       u:object_r:credstore_data_file:s0
 /data/misc/keystore(/.*)?       u:object_r:keystore_data_file:s0
-/data/misc/logd(/.*)?           u:object_r:misc_logd_file:s0
-/data/misc/media(/.*)?          u:object_r:media_data_file:s0
-/data/misc/net(/.*)?            u:object_r:net_data_file:s0
-/data/misc/network_watchlist(/.*)? u:object_r:network_watchlist_data_file:s0
-/data/misc/nfc/logs(/.*)?       u:object_r:nfc_logs_data_file:s0
-/data/misc/odrefresh(/.*)?      u:object_r:odrefresh_data_file:s0
-/data/misc/odsign(/.*)?         u:object_r:odsign_data_file:s0
-/data/misc/perfetto-traces/bugreport(.*)? u:object_r:perfetto_traces_bugreport_data_file:s0
-/data/misc/perfetto-traces(/.*)?          u:object_r:perfetto_traces_data_file:s0
-/data/misc/perfetto-configs(/.*)?         u:object_r:perfetto_configs_data_file:s0
-/data/misc/prereboot(/.*)?      u:object_r:prereboot_data_file:s0
-/data/misc/profcollectd(/.*)?   u:object_r:profcollectd_data_file:s0
-/data/misc/radio(/.*)?          u:object_r:radio_core_data_file:s0
-/data/misc/recovery(/.*)?       u:object_r:recovery_data_file:s0
-/data/misc/shared_relro(/.*)?   u:object_r:shared_relro_file:s0
-/data/misc/sms(/.*)?            u:object_r:radio_data_file:s0
-/data/misc/snapshotctl_log(/.*)?      u:object_r:snapshotctl_log_data_file:s0
-/data/misc/stats-active-metric(/.*)? u:object_r:stats_data_file:s0
-/data/misc/stats-data(/.*)?     u:object_r:stats_data_file:s0
-/data/misc/stats-service(/.*)?  u:object_r:stats_data_file:s0
-/data/misc/stats-metadata(/.*)? u:object_r:stats_data_file:s0
-/data/misc/systemkeys(/.*)?     u:object_r:systemkeys_data_file:s0
-/data/misc/textclassifier(/.*)?       u:object_r:textclassifier_data_file:s0
-/data/misc/train-info(/.*)?     u:object_r:stats_data_file:s0
-/data/misc/user(/.*)?           u:object_r:misc_user_data_file:s0
-/data/misc/virtualizationservice(/.*)? u:object_r:virtualizationservice_data_file:s0
-/data/misc/vpn(/.*)?            u:object_r:vpn_data_file:s0
-/data/misc/wifi(/.*)?           u:object_r:wifi_data_file:s0
-/data/misc_ce/[0-9]+/wifi(/.*)? u:object_r:wifi_data_file:s0
-/data/misc/wifi/sockets(/.*)?   u:object_r:wpa_socket:s0
-/data/misc/wifi/sockets/wpa_ctrl.*   u:object_r:system_wpa_socket:s0
-/data/misc/zoneinfo(/.*)?       u:object_r:zoneinfo_data_file:s0
-/data/misc/vold(/.*)?           u:object_r:vold_data_file:s0
-/data/misc/iorapd(/.*)?         u:object_r:iorapd_data_file:s0
-/data/misc/update_engine(/.*)?  u:object_r:update_engine_data_file:s0
-/data/misc/update_engine_log(/.*)?  u:object_r:update_engine_log_data_file:s0
-/data/system/dropbox(/.*)?      u:object_r:dropbox_data_file:s0
-/data/system/heapdump(/.*)?     u:object_r:heapdump_data_file:s0
-/data/misc/trace(/.*)?          u:object_r:method_trace_data_file:s0
-/data/misc/wmtrace(/.*)?        u:object_r:wm_trace_data_file:s0
-# TODO(calin) label profile reference differently so that only
-# profman run as a special user can write to them
-/data/misc/profiles/cur(/[0-9]+)?   u:object_r:user_profile_root_file:s0
-/data/misc/profiles/cur/[0-9]+/.*   u:object_r:user_profile_data_file:s0
-/data/misc/profiles/ref(/.*)?       u:object_r:user_profile_data_file:s0
-/data/misc/profman(/.*)?        u:object_r:profman_dump_data_file:s0
+/data/tombstones(/.*)?	u:object_r:tombstone_data_file:s0
 /data/vendor(/.*)?              u:object_r:vendor_data_file:s0
-/data/vendor_ce(/.*)?           u:object_r:vendor_data_file:s0
-/data/vendor_de(/.*)?           u:object_r:vendor_data_file:s0
-
-# storaged proto files
-/data/misc_de/[0-9]+/storaged(/.*)?       u:object_r:storaged_data_file:s0
-/data/misc_ce/[0-9]+/storaged(/.*)?       u:object_r:storaged_data_file:s0
-
-# Fingerprint data
-/data/system/users/[0-9]+/fpdata(/.*)? u:object_r:fingerprintd_data_file:s0
-
-# Fingerprint vendor data file
-/data/vendor_de/[0-9]+/fpdata(/.*)? u:object_r:fingerprint_vendor_data_file:s0
-
-# Face vendor data file
-/data/vendor_de/[0-9]+/facedata(/.*)? u:object_r:face_vendor_data_file:s0
-/data/vendor_ce/[0-9]+/facedata(/.*)? u:object_r:face_vendor_data_file:s0
-
-# Iris vendor data file
-/data/vendor_de/[0-9]+/irisdata(/.*)? u:object_r:iris_vendor_data_file:s0
-
-# Bootchart data
-/data/bootchart(/.*)?		u:object_r:bootchart_data_file:s0
-
-# App data snapshots (managed by installd).
-/data/misc_de/[0-9]+/rollback(/.*)?       u:object_r:rollback_data_file:s0
-/data/misc_ce/[0-9]+/rollback(/.*)?       u:object_r:rollback_data_file:s0
-
-# Apex data directories
-/data/misc_de/[0-9]+/apexdata(/.*)?       u:object_r:apex_module_data_file:s0
-/data/misc_ce/[0-9]+/apexdata(/.*)?       u:object_r:apex_module_data_file:s0
-/data/misc_ce/[0-9]+/apexdata/com\.android\.appsearch(/.*)?   u:object_r:apex_appsearch_data_file:s0
-/data/misc_de/[0-9]+/apexdata/com\.android\.permission(/.*)?  u:object_r:apex_permission_data_file:s0
-/data/misc_ce/[0-9]+/apexdata/com\.android\.permission(/.*)?  u:object_r:apex_permission_data_file:s0
-/data/misc_de/[0-9]+/apexdata/com\.android\.wifi(/.*)?  u:object_r:apex_wifi_data_file:s0
-/data/misc_ce/[0-9]+/apexdata/com\.android\.wifi(/.*)?  u:object_r:apex_wifi_data_file:s0
-
-# Apex rollback directories
-/data/misc_de/[0-9]+/apexrollback(/.*)?   u:object_r:apex_rollback_data_file:s0
-/data/misc_ce/[0-9]+/apexrollback(/.*)?   u:object_r:apex_rollback_data_file:s0
-
-# Incremental directories
-/data/incremental(/.*)?                                 u:object_r:apk_data_file:s0
-/data/incremental/MT_[^/]+/mount/.pending_reads         u:object_r:incremental_control_file:s0
-/data/incremental/MT_[^/]+/mount/.log                   u:object_r:incremental_control_file:s0
-/data/incremental/MT_[^/]+/mount/.blocks_written        u:object_r:incremental_control_file:s0
-
-#############################
-# Expanded data files
-#
-/mnt/expand(/.*)?                                   u:object_r:mnt_expand_file:s0
-/mnt/expand/[^/]+(/.*)?                             u:object_r:system_data_file:s0
-/mnt/expand/[^/]+/app(/.*)?                         u:object_r:apk_data_file:s0
-/mnt/expand/[^/]+/app/[^/]+/oat(/.*)?               u:object_r:dalvikcache_data_file:s0
-# /mnt/expand/..../app/[randomStringA]/[packageName]-[randomStringB]/base.apk layout
-/mnt/expand/[^/]+/app/[^/]+/[^/]+/oat(/.*)?        u:object_r:dalvikcache_data_file:s0
-/mnt/expand/[^/]+/app/vmdl[^/]+\.tmp(/.*)?          u:object_r:apk_tmp_file:s0
-/mnt/expand/[^/]+/app/vmdl[^/]+\.tmp/oat(/.*)?      u:object_r:dalvikcache_data_file:s0
-/mnt/expand/[^/]+/local/tmp(/.*)?                   u:object_r:shell_data_file:s0
-/mnt/expand/[^/]+/media(/.*)?                       u:object_r:media_rw_data_file:s0
-/mnt/expand/[^/]+/misc/vold(/.*)?                   u:object_r:vold_data_file:s0
-
-# coredump directory for userdebug/eng devices
-/cores(/.*)?                    u:object_r:coredump_file:s0
-
-# Wallpaper files
-/data/system/users/[0-9]+/wallpaper_lock_orig	u:object_r:wallpaper_file:s0
-/data/system/users/[0-9]+/wallpaper_lock	u:object_r:wallpaper_file:s0
-/data/system/users/[0-9]+/wallpaper_orig	u:object_r:wallpaper_file:s0
-/data/system/users/[0-9]+/wallpaper		u:object_r:wallpaper_file:s0
-
-# Ringtone files
-/data/system_de/[0-9]+/ringtones(/.*)?          u:object_r:ringtone_file:s0
-
-# ShortcutManager icons, e.g.
-#   /data/system_ce/0/shortcut_service/bitmaps/com.example.app/1457472879282.png
-/data/system_ce/[0-9]+/shortcut_service/bitmaps(/.*)? u:object_r:shortcut_manager_icons:s0
-
-# User icon files
-/data/system/users/[0-9]+/photo\.png             u:object_r:icon_file:s0
-
-# vold per-user data
-/data/misc_de/[0-9]+/vold(/.*)?           u:object_r:vold_data_file:s0
-/data/misc_ce/[0-9]+/vold(/.*)?           u:object_r:vold_data_file:s0
-
-# iorapd per-user data
-/data/misc_ce/[0-9]+/iorapd(/.*)?           u:object_r:iorapd_data_file:s0
-
-# Backup service persistent per-user bookkeeping
-/data/system_ce/[0-9]+/backup(/.*)?		u:object_r:backup_data_file:s0
-# Backup service temporary per-user data for inter-change with apps
-/data/system_ce/[0-9]+/backup_stage(/.*)?	u:object_r:backup_data_file:s0
-
-#############################
-# efs files
-#
-/efs(/.*)?		u:object_r:efs_file:s0
-
-#############################
-# Cache files
-#
-/cache(/.*)?		u:object_r:cache_file:s0
-/cache/recovery(/.*)?	u:object_r:cache_recovery_file:s0
-# General backup/restore interchange with apps
-/cache/backup_stage(/.*)?	u:object_r:cache_backup_file:s0
-# LocalTransport (backup) uses this subtree
-/cache/backup(/.*)?		u:object_r:cache_private_backup_file:s0
-
-#############################
-# Overlayfs support directories
-#
-/cache/overlay(/.*)?            u:object_r:overlayfs_file:s0
-/mnt/scratch(/.*)?              u:object_r:overlayfs_file:s0
-
-/data/cache(/.*)?		u:object_r:cache_file:s0
-/data/cache/recovery(/.*)?	u:object_r:cache_recovery_file:s0
-# General backup/restore interchange with apps
-/data/cache/backup_stage(/.*)?	u:object_r:cache_backup_file:s0
-# LocalTransport (backup) uses this subtree
-/data/cache/backup(/.*)?	u:object_r:cache_private_backup_file:s0
-
-#############################
-# Metadata files
-#
-/metadata(/.*)?           u:object_r:metadata_file:s0
-/metadata/apex(/.*)?      u:object_r:apex_metadata_file:s0
-/metadata/vold(/.*)?      u:object_r:vold_metadata_file:s0
-/metadata/gsi(/.*)?       u:object_r:gsi_metadata_file:s0
-/metadata/gsi/dsu/active  u:object_r:gsi_public_metadata_file:s0
-/metadata/gsi/dsu/booted  u:object_r:gsi_public_metadata_file:s0
-/metadata/gsi/dsu/lp_names  u:object_r:gsi_public_metadata_file:s0
-/metadata/gsi/dsu/[^/]+/metadata_encryption_dir u:object_r:gsi_public_metadata_file:s0
-/metadata/gsi/ota(/.*)?   u:object_r:ota_metadata_file:s0
-/metadata/password_slots(/.*)?    u:object_r:password_slot_metadata_file:s0
-/metadata/ota(/.*)?       u:object_r:ota_metadata_file:s0
-/metadata/bootstat(/.*)?  u:object_r:metadata_bootstat_file:s0
-/metadata/staged-install(/.*)?    u:object_r:staged_install_file:s0
-/metadata/userspacereboot(/.*)?    u:object_r:userspace_reboot_metadata_file:s0
-/metadata/watchdog(/.*)?    u:object_r:watchdog_metadata_file:s0
-
-#############################
-# asec containers
-/mnt/asec(/.*)?             u:object_r:asec_apk_file:s0
-/mnt/asec/[^/]+/[^/]+\.zip  u:object_r:asec_public_file:s0
-/mnt/asec/[^/]+/lib(/.*)?   u:object_r:asec_public_file:s0
-/data/app-asec(/.*)?        u:object_r:asec_image_file:s0
-
-#############################
-# external storage
-/mnt/media_rw(/.*)?         u:object_r:mnt_media_rw_file:s0
-/mnt/user(/.*)?             u:object_r:mnt_user_file:s0
-/mnt/pass_through(/.*)?     u:object_r:mnt_pass_through_file:s0
-/mnt/sdcard                 u:object_r:mnt_sdcard_file:s0
-/mnt/runtime(/.*)?          u:object_r:storage_file:s0
-/storage(/.*)?              u:object_r:storage_file:s0
-
-#############################
-# mount point for read-write vendor partitions
-/mnt/vendor(/.*)?           u:object_r:mnt_vendor_file:s0
-
-#############################
-# mount point for read-write product partitions
-/mnt/product(/.*)?          u:object_r:mnt_product_file:s0
-
-#############################
-# /postinstall file contexts
-/(system|product)/bin/check_dynamic_partitions  u:object_r:postinstall_exec:s0
-/(system|product)/bin/otapreopt_script          u:object_r:postinstall_exec:s0
-/(system|product)/bin/otapreopt                 u:object_r:postinstall_dexopt_exec:s0
diff --git a/virtualizationservice/Android.bp b/virtualizationservice/Android.bp
index f5ad1f8..700d0fc 100644
--- a/virtualizationservice/Android.bp
+++ b/virtualizationservice/Android.bp
@@ -2,8 +2,8 @@
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
-rust_binary {
-    name: "virtualizationservice",
+rust_defaults {
+    name: "virtualizationservice_defaults",
     crate_name: "virtualizationservice",
     srcs: ["src/main.rs"],
     edition: "2018",
@@ -24,12 +24,26 @@
         "libandroid_logger",
         "libanyhow",
         "libcommand_fds",
-        "libcompositediskconfig",
+        "libcrc32fast",
         "libdisk",
         "liblog_rust",
+        "libprotobuf",
+        "libprotos",
         "libserde_json",
         "libserde",
         "libshared_child",
+        "libuuid",
     ],
+}
+
+rust_binary {
+    name: "virtualizationservice",
+    defaults: ["virtualizationservice_defaults"],
     apex_available: ["com.android.virt"],
 }
+
+rust_test {
+    name: "virtualizationservice_device_test",
+    defaults: ["virtualizationservice_defaults"],
+    test_suites: ["general-tests"],
+}
diff --git a/virtualizationservice/TEST_MAPPING b/virtualizationservice/TEST_MAPPING
new file mode 100644
index 0000000..6456a98
--- /dev/null
+++ b/virtualizationservice/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "virtualizationservice_device_test"
+    }
+  ]
+}
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 6d3f737..0089bfc 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -227,16 +227,21 @@
             ));
         }
 
-        let composite_image_filename =
-            make_composite_image_filename(temporary_directory, next_temporary_image_id);
-        let (image, partition_files) =
-            make_composite_image(&disk.partitions, &composite_image_filename).map_err(|e| {
-                error!("Failed to make composite image with config {:?}: {}", disk, e);
-                new_binder_exception(
-                    ExceptionCode::SERVICE_SPECIFIC,
-                    format!("Failed to make composite image: {}", e),
-                )
-            })?;
+        let composite_image_filenames =
+            make_composite_image_filenames(temporary_directory, next_temporary_image_id);
+        let (image, partition_files) = make_composite_image(
+            &disk.partitions,
+            &composite_image_filenames.composite,
+            &composite_image_filenames.header,
+            &composite_image_filenames.footer,
+        )
+        .map_err(|e| {
+            error!("Failed to make composite image with config {:?}: {}", disk, e);
+            new_binder_exception(
+                ExceptionCode::SERVICE_SPECIFIC,
+                format!("Failed to make composite image: {}", e),
+            )
+        })?;
 
         // Pass the file descriptors for the various partition files to crosvm when it
         // is run.
@@ -257,13 +262,28 @@
 }
 
 /// Generates a unique filename to use for a composite disk image.
-fn make_composite_image_filename(
+fn make_composite_image_filenames(
     temporary_directory: &Path,
     next_temporary_image_id: &mut u64,
-) -> PathBuf {
+) -> CompositeImageFilenames {
     let id = *next_temporary_image_id;
     *next_temporary_image_id += 1;
-    temporary_directory.join(format!("composite-{}.img", id))
+    CompositeImageFilenames {
+        composite: temporary_directory.join(format!("composite-{}.img", id)),
+        header: temporary_directory.join(format!("composite-{}-header.img", id)),
+        footer: temporary_directory.join(format!("composite-{}-footer.img", id)),
+    }
+}
+
+/// Filenames for a composite disk image, including header and footer partitions.
+#[derive(Clone, Debug, Eq, PartialEq)]
+struct CompositeImageFilenames {
+    /// The composite disk image itself.
+    composite: PathBuf,
+    /// The header partition image.
+    header: PathBuf,
+    /// The footer partition image.
+    footer: PathBuf,
 }
 
 /// Gets the calling SID of the current Binder thread.
diff --git a/virtualizationservice/src/composite.rs b/virtualizationservice/src/composite.rs
index 37428eb..5f792fd 100644
--- a/virtualizationservice/src/composite.rs
+++ b/virtualizationservice/src/composite.rs
@@ -12,76 +12,334 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Functions for running `mk_cdisk`.
+//! Functions for creating a composite disk image.
 
-use android_system_virtualizationservice::aidl::android::system::virtualizationservice::Partition::Partition as AidlPartition;
-use anyhow::{bail, Context, Error};
-use command_fds::{CommandFdExt, FdMapping};
-use compositediskconfig::{Config, Partition};
-use log::info;
-use std::fs::File;
+use crate::gpt::{
+    write_gpt_header, write_protective_mbr, GptPartitionEntry, GPT_BEGINNING_SIZE, GPT_END_SIZE,
+    GPT_HEADER_SIZE, GPT_NUM_PARTITIONS, GPT_PARTITION_ENTRY_SIZE, SECTOR_SIZE,
+};
+use android_system_virtualizationservice::aidl::android::system::virtualizationservice::Partition::Partition;
+use anyhow::{anyhow, bail, Context, Error};
+use crc32fast::Hasher;
+use disk::create_disk_file;
+use log::{trace, warn};
+use protobuf::Message;
+use protos::cdisk_spec::{ComponentDisk, CompositeDisk, ReadWriteCapability};
+use std::convert::TryInto;
+use std::fs::{File, OpenOptions};
+use std::io::Write;
 use std::os::unix::io::AsRawFd;
-use std::panic;
-use std::path::Path;
-use std::process::{Command, Stdio};
-use std::str;
-use std::thread;
+use std::path::{Path, PathBuf};
+use uuid::Uuid;
 
-const MK_CDISK_PATH: &str = "/apex/com.android.virt/bin/mk_cdisk";
+/// A magic string placed at the beginning of a composite disk file to identify it.
+const CDISK_MAGIC: &str = "composite_disk\x1d";
+/// The version of the composite disk format supported by this implementation.
+const COMPOSITE_DISK_VERSION: u64 = 1;
+/// The amount of padding needed between the last partition entry and the first partition, to align
+/// the partition appropriately. The two sectors are for the MBR and the GPT header.
+const PARTITION_ALIGNMENT_SIZE: usize = GPT_BEGINNING_SIZE as usize
+    - 2 * SECTOR_SIZE as usize
+    - GPT_NUM_PARTITIONS as usize * GPT_PARTITION_ENTRY_SIZE as usize;
+const HEADER_PADDING_LENGTH: usize = SECTOR_SIZE as usize - GPT_HEADER_SIZE as usize;
+// Keep all partitions 4k aligned for performance.
+const PARTITION_SIZE_SHIFT: u8 = 12;
+// Keep the disk size a multiple of 64k for crosvm's virtio_blk driver.
+const DISK_SIZE_SHIFT: u8 = 16;
 
-/// Calls `mk_cdisk` to construct a composite disk image for the given list of partitions, and opens
-/// it ready to use. Returns the composite disk image file, and a list of FD mappings which must be
-/// applied to any process which wants to use it. This is necessary because the composite image
-/// contains paths of the form `/proc/self/fd/N` for the partition images.
-pub fn make_composite_image(
-    partitions: &[AidlPartition],
-    output_filename: &Path,
-) -> Result<(File, Vec<File>), Error> {
-    let (config_json, files) = make_config_json(partitions)?;
-    let fd_mappings: Vec<_> = files
-        .iter()
-        .map(|file| FdMapping { parent_fd: file.as_raw_fd(), child_fd: file.as_raw_fd() })
-        .collect();
+const LINUX_FILESYSTEM_GUID: Uuid = Uuid::from_u128(0x0FC63DAF_8483_4772_8E79_3D69D8477DE4);
+const EFI_SYSTEM_PARTITION_GUID: Uuid = Uuid::from_u128(0xC12A7328_F81F_11D2_BA4B_00A0C93EC93B);
 
-    let mut command = Command::new(MK_CDISK_PATH);
-    command
-        .arg("-") // Read config JSON from stdin.
-        .arg(&output_filename)
-        .stdin(Stdio::piped())
-        .stdout(Stdio::piped())
-        .stderr(Stdio::piped());
-    command.fd_mappings(fd_mappings)?;
-    let mut child = command.spawn().context("Failed to spawn mk_cdisk")?;
-    let stdin = child.stdin.take().unwrap();
+/// Information about a single image file to be included in a partition.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct PartitionFileInfo {
+    path: PathBuf,
+    size: u64,
+}
 
-    // Write config to stdin of mk_cdisk on a separate thread to avoid deadlock, as it may not read
-    // all of stdin before it blocks on writing to stdout.
-    let writer_thread = thread::spawn(move || {
-        config_json.write_json(&stdin).context("Failed to write config JSON for mk_cdisk")
+/// Information about a partition to create, including the set of image files which make it up.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct PartitionInfo {
+    label: String,
+    files: Vec<PartitionFileInfo>,
+    partition_type: ImagePartitionType,
+    writable: bool,
+}
+
+/// Round `val` up to the next multiple of 2**`align_log`.
+fn align_to_power_of_2(val: u64, align_log: u8) -> u64 {
+    let align = 1 << align_log;
+    ((val + (align - 1)) / align) * align
+}
+
+impl PartitionInfo {
+    fn aligned_size(&self) -> u64 {
+        align_to_power_of_2(self.files.iter().map(|file| file.size).sum(), PARTITION_SIZE_SHIFT)
+    }
+}
+
+/// The type of partition.
+#[allow(dead_code)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum ImagePartitionType {
+    LinuxFilesystem,
+    EfiSystemPartition,
+}
+
+impl ImagePartitionType {
+    fn guid(self) -> Uuid {
+        match self {
+            Self::LinuxFilesystem => LINUX_FILESYSTEM_GUID,
+            Self::EfiSystemPartition => EFI_SYSTEM_PARTITION_GUID,
+        }
+    }
+}
+
+/// Write protective MBR and primary GPT table.
+fn write_beginning(
+    file: &mut impl Write,
+    disk_guid: Uuid,
+    partitions: &[u8],
+    partition_entries_crc32: u32,
+    secondary_table_offset: u64,
+    disk_size: u64,
+) -> Result<(), Error> {
+    // Write the protective MBR to the first sector.
+    write_protective_mbr(file, disk_size)?;
+
+    // Write the GPT header, and pad out to the end of the sector.
+    write_gpt_header(file, disk_guid, partition_entries_crc32, secondary_table_offset, false)?;
+    file.write_all(&[0; HEADER_PADDING_LENGTH])?;
+
+    // Write partition entries, including unused ones.
+    file.write_all(partitions)?;
+
+    // Write zeroes to align the first partition appropriately.
+    file.write_all(&[0; PARTITION_ALIGNMENT_SIZE])?;
+
+    Ok(())
+}
+
+/// Write secondary GPT table.
+fn write_end(
+    file: &mut impl Write,
+    disk_guid: Uuid,
+    partitions: &[u8],
+    partition_entries_crc32: u32,
+    secondary_table_offset: u64,
+    disk_size: u64,
+) -> Result<(), Error> {
+    // Write partition entries, including unused ones.
+    file.write_all(partitions)?;
+
+    // Write the GPT header, and pad out to the end of the sector.
+    write_gpt_header(file, disk_guid, partition_entries_crc32, secondary_table_offset, true)?;
+    file.write_all(&[0; HEADER_PADDING_LENGTH])?;
+
+    // Pad out to the aligned disk size.
+    let used_disk_size = secondary_table_offset + GPT_END_SIZE;
+    let padding = disk_size - used_disk_size;
+    file.write_all(&vec![0; padding as usize])?;
+
+    Ok(())
+}
+
+/// Create the `GptPartitionEntry` for the given partition.
+fn create_gpt_entry(partition: &PartitionInfo, offset: u64) -> GptPartitionEntry {
+    let mut partition_name: Vec<u16> = partition.label.encode_utf16().collect();
+    partition_name.resize(36, 0);
+
+    GptPartitionEntry {
+        partition_type_guid: partition.partition_type.guid(),
+        unique_partition_guid: Uuid::new_v4(),
+        first_lba: offset / SECTOR_SIZE,
+        last_lba: (offset + partition.aligned_size()) / SECTOR_SIZE - 1,
+        attributes: 0,
+        partition_name: partition_name.try_into().unwrap(),
+    }
+}
+
+/// Create one or more `ComponentDisk` proto messages for the given partition.
+fn create_component_disks(
+    partition: &PartitionInfo,
+    offset: u64,
+    header_path: &str,
+) -> Result<Vec<ComponentDisk>, Error> {
+    let aligned_size = partition.aligned_size();
+
+    if partition.files.is_empty() {
+        bail!("No image files for partition {:?}", partition);
+    }
+    let mut file_size_sum = 0;
+    let mut component_disks = vec![];
+    for file in &partition.files {
+        component_disks.push(ComponentDisk {
+            offset: offset + file_size_sum,
+            file_path: file.path.to_str().context("Invalid partition path")?.to_string(),
+            read_write_capability: if partition.writable {
+                ReadWriteCapability::READ_WRITE
+            } else {
+                ReadWriteCapability::READ_ONLY
+            },
+            ..ComponentDisk::new()
+        });
+        file_size_sum += file.size;
+    }
+
+    if file_size_sum != aligned_size {
+        if partition.writable {
+            bail!(
+                "Read-write partition {:?} size is not a multiple of {}.",
+                partition,
+                1 << PARTITION_SIZE_SHIFT
+            );
+        } else {
+            // Fill in the gap by reusing the header file, because we know it is always bigger
+            // than the alignment size (i.e. GPT_BEGINNING_SIZE > 1 << PARTITION_SIZE_SHIFT).
+            warn!(
+                "Read-only partition {:?} size is not a multiple of {}, filling gap.",
+                partition,
+                1 << PARTITION_SIZE_SHIFT
+            );
+            component_disks.push(ComponentDisk {
+                offset: offset + file_size_sum,
+                file_path: header_path.to_owned(),
+                read_write_capability: ReadWriteCapability::READ_ONLY,
+                ..ComponentDisk::new()
+            });
+        }
+    }
+
+    Ok(component_disks)
+}
+
+/// Create a new composite disk containing the given partitions, and write it out to the given
+/// files.
+pub fn create_composite_disk(
+    partitions: &[PartitionInfo],
+    header_path: &Path,
+    header_file: &mut File,
+    footer_path: &Path,
+    footer_file: &mut File,
+    output_composite: &mut File,
+) -> Result<(), Error> {
+    let header_path = header_path.to_str().context("Invalid header path")?.to_string();
+    let footer_path = footer_path.to_str().context("Invalid footer path")?.to_string();
+
+    let mut composite_proto = CompositeDisk::new();
+    composite_proto.version = COMPOSITE_DISK_VERSION;
+    composite_proto.component_disks.push(ComponentDisk {
+        file_path: header_path.clone(),
+        offset: 0,
+        read_write_capability: ReadWriteCapability::READ_ONLY,
+        ..ComponentDisk::new()
     });
-    info!("Running {:?}", command);
-    let output = child.wait_with_output()?;
-    match writer_thread.join() {
-        Ok(result) => result?,
-        Err(panic_payload) => panic::resume_unwind(panic_payload),
-    }
 
-    if !output.status.success() {
-        info!("mk_cdisk stdout: {}", str::from_utf8(&output.stdout)?);
-        info!("mk_cdisk stderr: {}", str::from_utf8(&output.stderr)?);
-        bail!("mk_cdisk exited with error {}", output.status);
-    }
+    // Write partitions to a temporary buffer so that we can calculate the CRC, and construct the
+    // ComponentDisk proto messages at the same time.
+    let mut partitions_buffer =
+        [0u8; GPT_NUM_PARTITIONS as usize * GPT_PARTITION_ENTRY_SIZE as usize];
+    let mut writer: &mut [u8] = &mut partitions_buffer;
+    let mut next_disk_offset = GPT_BEGINNING_SIZE;
+    for partition in partitions {
+        create_gpt_entry(partition, next_disk_offset).write_bytes(&mut writer)?;
 
-    let composite_image = File::open(&output_filename)
-        .with_context(|| format!("Failed to open composite image {:?}", output_filename))?;
+        for component_disk in create_component_disks(partition, next_disk_offset, &header_path)? {
+            composite_proto.component_disks.push(component_disk);
+        }
+
+        next_disk_offset += partition.aligned_size();
+    }
+    let secondary_table_offset = next_disk_offset;
+    let disk_size = align_to_power_of_2(secondary_table_offset + GPT_END_SIZE, DISK_SIZE_SHIFT);
+    trace!("Partitions: {:#?}", partitions);
+    trace!("Secondary table offset: {} disk size: {}", secondary_table_offset, disk_size);
+
+    composite_proto.component_disks.push(ComponentDisk {
+        file_path: footer_path,
+        offset: secondary_table_offset,
+        read_write_capability: ReadWriteCapability::READ_ONLY,
+        ..ComponentDisk::new()
+    });
+
+    // Calculate CRC32 of partition entries.
+    let mut hasher = Hasher::new();
+    hasher.update(&partitions_buffer);
+    let partition_entries_crc32 = hasher.finalize();
+
+    let disk_guid = Uuid::new_v4();
+    write_beginning(
+        header_file,
+        disk_guid,
+        &partitions_buffer,
+        partition_entries_crc32,
+        secondary_table_offset,
+        disk_size,
+    )?;
+    write_end(
+        footer_file,
+        disk_guid,
+        &partitions_buffer,
+        partition_entries_crc32,
+        secondary_table_offset,
+        disk_size,
+    )?;
+
+    composite_proto.length = disk_size;
+    output_composite.write_all(CDISK_MAGIC.as_bytes())?;
+    composite_proto.write_to_writer(output_composite)?;
+
+    Ok(())
+}
+
+/// Constructs a composite disk image for the given list of partitions, and opens it ready to use.
+///
+/// Returns the composite disk image file, and a list of FD mappings which must be applied to any
+/// process which wants to use it. This is necessary because the composite image contains paths of
+/// the form `/proc/self/fd/N` for the partition images.
+pub fn make_composite_image(
+    partitions: &[Partition],
+    output_path: &Path,
+    header_path: &Path,
+    footer_path: &Path,
+) -> Result<(File, Vec<File>), Error> {
+    let (partitions, files) = convert_partitions(partitions)?;
+
+    let mut composite_image = OpenOptions::new()
+        .create_new(true)
+        .read(true)
+        .write(true)
+        .open(output_path)
+        .with_context(|| format!("Failed to create composite image {:?}", output_path))?;
+    let mut header_file =
+        OpenOptions::new().create_new(true).read(true).write(true).open(header_path).with_context(
+            || format!("Failed to create composite image header {:?}", header_path),
+        )?;
+    let mut footer_file =
+        OpenOptions::new().create_new(true).read(true).write(true).open(footer_path).with_context(
+            || format!("Failed to create composite image header {:?}", footer_path),
+        )?;
+
+    create_composite_disk(
+        &partitions,
+        header_path,
+        &mut header_file,
+        footer_path,
+        &mut footer_file,
+        &mut composite_image,
+    )?;
+
+    // Re-open the composite image as read-only.
+    let composite_image = File::open(&output_path)
+        .with_context(|| format!("Failed to open composite image {:?}", output_path))?;
 
     Ok((composite_image, files))
 }
 
 /// Given the AIDL config containing a list of partitions, with a [`ParcelFileDescriptor`] for each
 /// partition, return the list of file descriptors which must be passed to the mk_cdisk child
-/// process and the JSON configuration for it.
-fn make_config_json(partitions: &[AidlPartition]) -> Result<(Config, Vec<File>), Error> {
+/// process and the composite disk image partition configuration for it.
+fn convert_partitions(partitions: &[Partition]) -> Result<(Vec<PartitionInfo>, Vec<File>), Error> {
     // File descriptors to pass to child process.
     let mut files = vec![];
 
@@ -96,17 +354,91 @@
                 .as_ref()
                 .try_clone()
                 .context("Failed to clone partition image file descriptor")?;
+            let size = get_partition_size(&file)?;
             let fd = file.as_raw_fd();
             files.push(file);
 
-            Ok(Partition {
-                writable: partition.writable,
+            Ok(PartitionInfo {
                 label: partition.label.to_owned(),
-                path: format!("/proc/self/fd/{}", fd).into(),
+                files: vec![PartitionFileInfo {
+                    path: format!("/proc/self/fd/{}", fd).into(),
+                    size,
+                }],
+                partition_type: ImagePartitionType::LinuxFilesystem,
+                writable: partition.writable,
             })
         })
         .collect::<Result<_, Error>>()?;
-    let config_json = Config { partitions };
 
-    Ok((config_json, files))
+    Ok((partitions, files))
+}
+
+/// Find the size of the partition image in the given file by parsing the header.
+///
+/// This will work for raw, QCOW2, composite and Android sparse images.
+fn get_partition_size(partition: &File) -> Result<u64, Error> {
+    // TODO: Use `context` once disk::Error implements std::error::Error.
+    Ok(create_disk_file(partition.try_clone()?)
+        .map_err(|e| anyhow!("Failed to open partition image: {}", e))?
+        .get_len()?)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn beginning_size() {
+        let mut buffer = vec![];
+        let partitions = [0u8; GPT_NUM_PARTITIONS as usize * GPT_PARTITION_ENTRY_SIZE as usize];
+        let disk_size = 1000 * SECTOR_SIZE;
+        write_beginning(
+            &mut buffer,
+            Uuid::from_u128(0x12345678_1234_5678_abcd_12345678abcd),
+            &partitions,
+            42,
+            disk_size - GPT_END_SIZE,
+            disk_size,
+        )
+        .unwrap();
+
+        assert_eq!(buffer.len(), GPT_BEGINNING_SIZE as usize);
+    }
+
+    #[test]
+    fn end_size() {
+        let mut buffer = vec![];
+        let partitions = [0u8; GPT_NUM_PARTITIONS as usize * GPT_PARTITION_ENTRY_SIZE as usize];
+        let disk_size = 1000 * SECTOR_SIZE;
+        write_end(
+            &mut buffer,
+            Uuid::from_u128(0x12345678_1234_5678_abcd_12345678abcd),
+            &partitions,
+            42,
+            disk_size - GPT_END_SIZE,
+            disk_size,
+        )
+        .unwrap();
+
+        assert_eq!(buffer.len(), GPT_END_SIZE as usize);
+    }
+
+    #[test]
+    fn end_size_with_padding() {
+        let mut buffer = vec![];
+        let partitions = [0u8; GPT_NUM_PARTITIONS as usize * GPT_PARTITION_ENTRY_SIZE as usize];
+        let disk_size = 1000 * SECTOR_SIZE;
+        let padding = 3 * SECTOR_SIZE;
+        write_end(
+            &mut buffer,
+            Uuid::from_u128(0x12345678_1234_5678_abcd_12345678abcd),
+            &partitions,
+            42,
+            disk_size - GPT_END_SIZE - padding,
+            disk_size,
+        )
+        .unwrap();
+
+        assert_eq!(buffer.len(), GPT_END_SIZE as usize + padding as usize);
+    }
 }
diff --git a/virtualizationservice/src/gpt.rs b/virtualizationservice/src/gpt.rs
new file mode 100644
index 0000000..346a40a
--- /dev/null
+++ b/virtualizationservice/src/gpt.rs
@@ -0,0 +1,240 @@
+// Copyright 2021, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Functions for writing GUID Partition Tables for use in a composite disk image.
+
+use anyhow::Error;
+use crc32fast::Hasher;
+use std::convert::TryInto;
+use std::io::Write;
+use uuid::Uuid;
+
+/// The size in bytes of a disk sector (also called a block).
+pub const SECTOR_SIZE: u64 = 1 << 9;
+/// The size in bytes on an MBR partition entry.
+const MBR_PARTITION_ENTRY_SIZE: usize = 16;
+/// The size in bytes of a GPT header.
+pub const GPT_HEADER_SIZE: u32 = 92;
+/// The number of partition entries in the GPT, which is the maximum number of partitions which are
+/// supported.
+pub const GPT_NUM_PARTITIONS: u32 = 128;
+/// The size in bytes of a single GPT partition entry.
+pub const GPT_PARTITION_ENTRY_SIZE: u32 = 128;
+/// The size in bytes of everything before the first partition: i.e. the MBR, GPT header and GPT
+/// partition entries.
+pub const GPT_BEGINNING_SIZE: u64 = SECTOR_SIZE * 40;
+/// The size in bytes of everything after the last partition: i.e. the GPT partition entries and GPT
+/// footer.
+pub const GPT_END_SIZE: u64 = SECTOR_SIZE * 33;
+
+/// Write a protective MBR for a disk of the given total size (in bytes).
+///
+/// This should be written at the start of the disk, before the GPT header. It
+/// is one `SECTOR_SIZE` long.
+pub fn write_protective_mbr(file: &mut impl Write, disk_size: u64) -> Result<(), Error> {
+    // Bootstrap code
+    file.write_all(&[0; 446])?;
+
+    // Partition status
+    file.write_all(&[0x00])?;
+    // Begin CHS
+    file.write_all(&[0; 3])?;
+    // Partition type
+    file.write_all(&[0xEE])?;
+    // End CHS
+    file.write_all(&[0; 3])?;
+    let first_lba: u32 = 1;
+    file.write_all(&first_lba.to_le_bytes())?;
+    let number_of_sectors: u32 = (disk_size / SECTOR_SIZE).try_into()?;
+    file.write_all(&number_of_sectors.to_le_bytes())?;
+
+    // Three more empty partitions
+    file.write_all(&[0; MBR_PARTITION_ENTRY_SIZE * 3])?;
+
+    // Boot signature
+    file.write_all(&[0x55, 0xAA])?;
+
+    Ok(())
+}
+
+#[derive(Clone, Debug, Default, Eq, PartialEq)]
+struct GptHeader {
+    signature: [u8; 8],
+    revision: [u8; 4],
+    header_size: u32,
+    header_crc32: u32,
+    current_lba: u64,
+    backup_lba: u64,
+    first_usable_lba: u64,
+    last_usable_lba: u64,
+    disk_guid: Uuid,
+    partition_entries_lba: u64,
+    num_partition_entries: u32,
+    partition_entry_size: u32,
+    partition_entries_crc32: u32,
+}
+
+impl GptHeader {
+    fn write_bytes(&self, out: &mut impl Write) -> Result<(), Error> {
+        out.write_all(&self.signature)?;
+        out.write_all(&self.revision)?;
+        out.write_all(&self.header_size.to_le_bytes())?;
+        out.write_all(&self.header_crc32.to_le_bytes())?;
+        // Reserved
+        out.write_all(&[0; 4])?;
+        out.write_all(&self.current_lba.to_le_bytes())?;
+        out.write_all(&self.backup_lba.to_le_bytes())?;
+        out.write_all(&self.first_usable_lba.to_le_bytes())?;
+        out.write_all(&self.last_usable_lba.to_le_bytes())?;
+
+        // GUID is mixed-endian for some reason, so we can't just use `Uuid::as_bytes()`.
+        write_guid(out, self.disk_guid)?;
+
+        out.write_all(&self.partition_entries_lba.to_le_bytes())?;
+        out.write_all(&self.num_partition_entries.to_le_bytes())?;
+        out.write_all(&self.partition_entry_size.to_le_bytes())?;
+        out.write_all(&self.partition_entries_crc32.to_le_bytes())?;
+        Ok(())
+    }
+}
+
+/// Write a GPT header for the disk.
+///
+/// It may either be a primary header (which should go at LBA 1) or a secondary header (which should
+/// go at the end of the disk).
+pub fn write_gpt_header(
+    out: &mut impl Write,
+    disk_guid: Uuid,
+    partition_entries_crc32: u32,
+    secondary_table_offset: u64,
+    secondary: bool,
+) -> Result<(), Error> {
+    let primary_header_lba = 1;
+    let secondary_header_lba = (secondary_table_offset + GPT_END_SIZE) / SECTOR_SIZE - 1;
+    let mut gpt_header = GptHeader {
+        signature: *b"EFI PART",
+        revision: [0, 0, 1, 0],
+        header_size: GPT_HEADER_SIZE,
+        current_lba: if secondary { secondary_header_lba } else { primary_header_lba },
+        backup_lba: if secondary { primary_header_lba } else { secondary_header_lba },
+        first_usable_lba: GPT_BEGINNING_SIZE / SECTOR_SIZE,
+        last_usable_lba: secondary_table_offset / SECTOR_SIZE - 1,
+        disk_guid,
+        partition_entries_lba: 2,
+        num_partition_entries: GPT_NUM_PARTITIONS,
+        partition_entry_size: GPT_PARTITION_ENTRY_SIZE,
+        partition_entries_crc32,
+        header_crc32: 0,
+    };
+
+    // Write once to a temporary buffer to calculate the CRC.
+    let mut header_without_crc = [0u8; GPT_HEADER_SIZE as usize];
+    gpt_header.write_bytes(&mut &mut header_without_crc[..])?;
+    let mut hasher = Hasher::new();
+    hasher.update(&header_without_crc);
+    gpt_header.header_crc32 = hasher.finalize();
+
+    gpt_header.write_bytes(out)?;
+
+    Ok(())
+}
+
+/// A GPT entry for a particular partition.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct GptPartitionEntry {
+    pub partition_type_guid: Uuid,
+    pub unique_partition_guid: Uuid,
+    pub first_lba: u64,
+    pub last_lba: u64,
+    pub attributes: u64,
+    /// UTF-16LE
+    pub partition_name: [u16; 36],
+}
+
+// TODO: Derive this once arrays of more than 32 elements have default values.
+impl Default for GptPartitionEntry {
+    fn default() -> Self {
+        Self {
+            partition_type_guid: Default::default(),
+            unique_partition_guid: Default::default(),
+            first_lba: 0,
+            last_lba: 0,
+            attributes: 0,
+            partition_name: [0; 36],
+        }
+    }
+}
+
+impl GptPartitionEntry {
+    /// Write out the partition table entry. It will take
+    /// `GPT_PARTITION_ENTRY_SIZE` bytes.
+    pub fn write_bytes(&self, out: &mut impl Write) -> Result<(), Error> {
+        write_guid(out, self.partition_type_guid)?;
+        write_guid(out, self.unique_partition_guid)?;
+        out.write_all(&self.first_lba.to_le_bytes())?;
+        out.write_all(&self.last_lba.to_le_bytes())?;
+        out.write_all(&self.attributes.to_le_bytes())?;
+        for code_unit in &self.partition_name {
+            out.write_all(&code_unit.to_le_bytes())?;
+        }
+        Ok(())
+    }
+}
+
+/// Write a UUID in the mixed-endian format which GPT uses for GUIDs.
+fn write_guid(out: &mut impl Write, guid: Uuid) -> Result<(), Error> {
+    let guid_fields = guid.as_fields();
+    out.write_all(&guid_fields.0.to_le_bytes())?;
+    out.write_all(&guid_fields.1.to_le_bytes())?;
+    out.write_all(&guid_fields.2.to_le_bytes())?;
+    out.write_all(guid_fields.3)?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn protective_mbr_size() {
+        let mut buffer = vec![];
+        write_protective_mbr(&mut buffer, 1000 * SECTOR_SIZE).unwrap();
+
+        assert_eq!(buffer.len(), SECTOR_SIZE as usize);
+    }
+
+    #[test]
+    fn header_size() {
+        let mut buffer = vec![];
+        write_gpt_header(
+            &mut buffer,
+            Uuid::from_u128(0x12345678_1234_5678_abcd_12345678abcd),
+            42,
+            1000 * SECTOR_SIZE,
+            false,
+        )
+        .unwrap();
+
+        assert_eq!(buffer.len(), GPT_HEADER_SIZE as usize);
+    }
+
+    #[test]
+    fn partition_entry_size() {
+        let mut buffer = vec![];
+        GptPartitionEntry::default().write_bytes(&mut buffer).unwrap();
+
+        assert_eq!(buffer.len(), GPT_PARTITION_ENTRY_SIZE as usize);
+    }
+}
diff --git a/virtualizationservice/src/main.rs b/virtualizationservice/src/main.rs
index a68e5eb..43b5fe4 100644
--- a/virtualizationservice/src/main.rs
+++ b/virtualizationservice/src/main.rs
@@ -17,6 +17,7 @@
 mod aidl;
 mod composite;
 mod crosvm;
+mod gpt;
 
 use crate::aidl::{VirtualizationService, BINDER_SERVICE_IDENTIFIER};
 use android_system_virtualizationservice::aidl::android::system::virtualizationservice::IVirtualizationService::BnVirtualizationService;