Add checkfc mode to validate file_contexts against test data

A new mode for checkfc is introduced (-t) which takes a file_contexts
and a test data file. Each line in the test data file contains a path
and the expected type. checkfc loads the file_contexts and repeatedly
calls selabel_lookup(3) to verify that the computed type is as expected.

This mode can be used to confirm that any modification to file_contexts
or its build process is benign.

A test data file (plat_file_contexts_test) is added. This file was
manually created based on private/file_contexts. Each static path was
copied as-is. Each regular expression was expanded into a couple of
entries. For instance, /dev/adf[0-9]* generated /dev/adf, /dev/adf0 and
/dev/adf123.

libselinux keeps track of which specification is being hit when using
selabel_lookup. When calling selabel_stats(3), the file backend will
output a warning if a specification has not been used. This can be
leveraged to ensure that each rule is at least hit once. This property
will be leveraged in a follow-up change (by running the test as part of
the build process), to ensure that the plat_file_contexts_test file
remains up-to-date (that is, when an entry is added to
private/file_contexts, the build will fail unless a test is also added
to plat_file_contexts_test to exercice the specification/regular
expression).

Test: m checkfc && checkfc -t ./private/file_contexts ./tests/plat_file_contexts_test
Bug: 299839280
Change-Id: Ibf56859a16bd17e1f878ce7b0570b2aead79c7e0
diff --git a/tests/plat_file_contexts_test b/tests/plat_file_contexts_test
new file mode 100644
index 0000000..9d8d906
--- /dev/null
+++ b/tests/plat_file_contexts_test
@@ -0,0 +1,1261 @@
+# Test data for private/file_contexts.
+#
+# It can be passed to checkfc to confirm that the regular expressions in
+# file_contexts are matching the intended paths.
+/                                                                 rootfs
+/adb_keys                                                         adb_keys_file
+/build.prop                                                       rootfs
+/default.prop                                                     rootfs
+/fstab.persist                                                    rootfs
+/fstab.postinstall                                                rootfs
+/init.rc                                                          rootfs
+/init.environ.rc                                                  rootfs
+/res                                                              rootfs
+/res/test                                                         rootfs
+/selinux_version                                                  rootfs
+/ueventd.rc                                                       rootfs
+/ueventd.common.rc                                                rootfs
+/verity_key                                                       rootfs
+
+/init                                                             init_exec
+/sbin                                                             rootfs
+/sbin/su                                                          rootfs
+
+/lib                                                              rootfs
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+/system_dlkm                                                      system_dlkm_file
+/system_dlkm/lib/modules/modules.load                             system_dlkm_file
+
+/lost+found                                                       rootfs
+/acct                                                             cgroup
+/config                                                           rootfs
+/data_mirror                                                      mirror_data_file
+/debug_ramdisk                                                    tmpfs
+/mnt                                                              tmpfs
+/proc                                                             rootfs
+/second_stage_resources                                           tmpfs
+/sys                                                              sysfs
+/apex                                                             apex_mnt_dir
+/bootstrap-apex                                                   apex_mnt_dir
+
+/postinstall                                                      postinstall_mnt_dir
+/postinstall/apex                                                 postinstall_apex_mnt_dir
+
+/apex/.bootstrap-apex-info-list.xml                               apex_info_file
+/apex/.default-apex-info-list.xml                                 apex_info_file
+/apex/apex-info-list.xml                                          apex_info_file
+
+/bin                                                              rootfs
+/bugreports                                                       rootfs
+/charger                                                          rootfs
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+/etc                                                              rootfs
+/sdcard                                                           rootfs
+
+/vendor_file_contexts                                             file_contexts_file
+/plat_file_contexts                                               file_contexts_file
+/product_file_contexts                                            file_contexts_file
+/mapping_sepolicy.cil                                             sepolicy_file
+/plat_sepolicy.cil                                                sepolicy_file
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+/vendor_seapp_contexts                                            seapp_contexts_file
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+/plat_service_contexts                                            service_contexts_file
+/plat_hwservice_contexts                                          hwservice_contexts_file
+/plat_keystore2_key_contexts                                      keystore2_key_contexts_file
+/vendor_service_contexts                                          vendor_service_contexts_file
+/vendor_hwservice_contexts                                        hwservice_contexts_file
+/vndservice_contexts                                              vndservice_contexts_file
+
+/dev                                                              device
+/dev/does_not_exist                                               device
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+/dev/adf0                                                         graphics_device
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+/dev/block/dm-123                                                 dm_device
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+/dev/block/ublkb123                                               ublk_block_device
+/dev/block/ublkb                                                  block_device
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+/dev/block/loop10                                                 loop_device
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+/dev/null                                                         null_device
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+/dev/rtc9                                                         rtc_device
+/dev/snd                                                          audio_device
+/dev/snd/controlC0                                                audio_device
+/dev/snd/timer                                                    audio_device
+/dev/socket                                                       socket_device
+/dev/socket/does_not_exist                                        socket_device
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+/dev/socket/fwmarkd                                               fwmarkd_socket
+/dev/socket/lmkd                                                  lmkd_socket
+/dev/socket/logd                                                  logd_socket
+/dev/socket/logdr                                                 logdr_socket
+/dev/socket/logdw                                                 logdw_socket
+/dev/socket/statsdw                                               statsdw_socket
+/dev/socket/mdns                                                  mdns_socket
+/dev/socket/mdnsd                                                 mdnsd_socket
+/dev/socket/mtpd                                                  mtpd_socket
+/dev/socket/pdx/system/buffer_hub                                 pdx_bufferhub_dir
+/dev/socket/pdx/system/buffer_hub/client                          pdx_bufferhub_client_endpoint_socket
+/dev/socket/pdx/system/performance                                pdx_performance_dir
+/dev/socket/pdx/system/performance/client                         pdx_performance_client_endpoint_socket
+/dev/socket/pdx/system/vr/display                                 pdx_display_dir
+/dev/socket/pdx/system/vr/display/client                          pdx_display_client_endpoint_socket
+/dev/socket/pdx/system/vr/display/manager                         pdx_display_manager_endpoint_socket
+/dev/socket/pdx/system/vr/display/screenshot                      pdx_display_screenshot_endpoint_socket
+/dev/socket/pdx/system/vr/display/vsync                           pdx_display_vsync_endpoint_socket
+/dev/socket/prng_seeder                                           prng_seeder_socket
+/dev/socket/property_service                                      property_socket
+/dev/socket/racoon                                                racoon_socket
+/dev/socket/recovery                                              recovery_socket
+/dev/socket/rild                                                  rild_socket
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+/dev/socket/snapuserd                                             snapuserd_socket
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+/dev/socket/heapprofd                                             heapprofd_socket
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+/dev/socket/wpa_eth0                                              wpa_socket
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+/dev/sys/block/by-name/rootdisk-test                              device
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+/dev/ttyACM99                                                     usb_serial_device
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+
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+
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+/system/bin/snapuserd                                             snapuserd_exec
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+/system/bin/uprobestats                                           uprobestats_exec
+
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+/vendor/lib/vndk-sp                                               vndk_sp_file
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+/vendor/apex                                                      vendor_apex_file
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+/odm/usr/keylayout.kl                                             vendor_keylayout_file
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+/oem                                                              oemfs
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+/product                                                          system_file
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+/product/lib                                                      system_lib_file
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+
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+
+
+/system_ext/bin/canhalconfigurator                                canhalconfigurator_exec
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+
+/vendor_dlkm                                                      vendor_file
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+
+/odm_dlkm                                                         vendor_file
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+
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+
+/data                                                             system_data_root_file
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+/data/unencrypted                                                 unencrypted_data_file
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+/data/system/ndebugsocket                                         system_ndebug_socket
+/data/system/unsolzygotesocket                                    system_unsolzygote_socket
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+/data/misc/profman                                                profman_dump_data_file
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+/data/vendor_de                                                   vendor_userdir_file
+/data/vendor_de/test                                              vendor_data_file
+
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+/data/misc_ce/0/storaged                                          storaged_data_file
+/data/misc_ce/99/storaged/test                                    storaged_data_file
+
+/data/misc_ce/0/checkin                                           checkin_data_file
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+
+/data/system/users/0/fpdata                                       fingerprintd_data_file
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+/data/vendor_ce/0/facedata                                        face_vendor_data_file
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+/data/vendor_de/0/irisdata                                        iris_vendor_data_file
+/data/vendor_de/99/irisdata/test                                  iris_vendor_data_file
+
+/data/bootchart                                                   bootchart_data_file
+/data/bootchart/test                                              bootchart_data_file
+
+/data/misc_de/0/sdksandbox                                        sdk_sandbox_system_data_file
+/data/misc_de/99/sdksandbox                                       sdk_sandbox_system_data_file
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+/data/misc_ce/99/sdksandbox                                       sdk_sandbox_system_data_file
+
+/data/misc_de/0/rollback                                          rollback_data_file
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+/data/misc_ce/0/rollback                                          rollback_data_file
+/data/misc_ce/99/rollback/test                                    rollback_data_file
+
+/data/misc_de/0/apexdata                                          apex_module_data_file
+/data/misc_de/99/apexdata/test                                    apex_module_data_file
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+/data/misc_ce/0/apexdata/com.android.appsearch                    apex_system_server_data_file
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+/data/misc_de/99/apexdata/com.android.permission/test             apex_system_server_data_file
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+/data/misc_ce/99/apexdata/com.android.permission/test             apex_system_server_data_file
+/data/misc_de/0/apexdata/com.android.wifi                         apex_system_server_data_file
+/data/misc_de/99/apexdata/com.android.wifi/test                   apex_system_server_data_file
+/data/misc_ce/0/apexdata/com.android.wifi                         apex_system_server_data_file
+/data/misc_ce/99/apexdata/com.android.wifi/test                   apex_system_server_data_file
+/data/misc_de/0/apexdata/com.android.uwb                          apex_system_server_data_file
+/data/misc_de/99/apexdata/com.android.uwb/test                    apex_system_server_data_file
+/data/misc_ce/0/apexdata/com.android.uwb                          apex_system_server_data_file
+/data/misc_ce/99/apexdata/com.android.uwb/test                    apex_system_server_data_file
+
+/data/misc_de/0/apexrollback                                      apex_rollback_data_file
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+/data/misc_ce/0/apexrollback                                      apex_rollback_data_file
+/data/misc_ce/99/apexrollback/test                                apex_rollback_data_file
+
+/data/incremental                                                 apk_data_file
+/data/incremental/test                                            apk_data_file
+/data/incremental/MT_test/mount/.pending_reads                    incremental_control_file
+/data/incremental/MT_test/mount/.log                              incremental_control_file
+/data/incremental/MT_test/mount/.blocks_written                   incremental_control_file
+
+/data/misc/bootanim                                               bootanim_data_file
+/data/misc/bootanim/test                                          bootanim_data_file
+/mnt/expand                                                       mnt_expand_file
+/mnt/expand/does_not_exist                                        system_data_file
+/mnt/expand/test/test                                             system_data_file
+/mnt/expand/test/app                                              apk_data_file
+/mnt/expand/test/app/test                                         apk_data_file
+/mnt/expand/test/app/test/oat                                     dalvikcache_data_file
+/mnt/expand/test/app/test/oat/test                                dalvikcache_data_file
+/mnt/expand/test/app/test/test/oat                                dalvikcache_data_file
+/mnt/expand/test/app/test/test/oat/test                           dalvikcache_data_file
+/mnt/expand/test/app/vmdltest.tmp                                 apk_tmp_file
+/mnt/expand/test/app/vmdltest.tmp/test                            apk_tmp_file
+/mnt/expand/test/app/vmdltest.tmp/oat                             dalvikcache_data_file
+/mnt/expand/test/app/vmdltest.tmp/oat/test                        dalvikcache_data_file
+/mnt/expand/test/local/tmp                                        shell_data_file
+/mnt/expand/test/local/tmp/test                                   shell_data_file
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+/mnt/expand/test/media/test                                       media_rw_data_file
+/mnt/expand/test/misc/vold                                        vold_data_file
+/mnt/expand/test/misc/vold/test                                   vold_data_file
+/mnt/expand/test/misc_ce                                          system_userdir_file
+/mnt/expand/test/misc_de                                          system_userdir_file
+/mnt/expand/test/user                                             system_userdir_file
+/mnt/expand/test/user_de                                          system_userdir_file
+
+/cores                                                            coredump_file
+/cores/test                                                       coredump_file
+
+/data/system/users/0/wallpaper_lock_orig                          wallpaper_file
+/data/system/users/99/wallpaper_lock                              wallpaper_file
+/data/system/users/0/wallpaper_orig                               wallpaper_file
+/data/system/users/10/wallpaper                                   wallpaper_file
+
+/data/system_de/0/ringtones                                       ringtone_file
+/data/system_de/0/ringtones/test                                  ringtone_file
+
+/data/system_ce/0/shortcut_service/bitmaps                        shortcut_manager_icons
+/data/system_ce/9/shortcut_service/bitmaps/test                   shortcut_manager_icons
+
+/data/system/users/10/photo.png                                   icon_file
+
+/data/system/shutdown-checkpoints                                 shutdown_checkpoints_system_data_file
+/data/system/shutdown-checkpoints/test                            shutdown_checkpoints_system_data_file
+
+/data/misc_de/0/vold                                              vold_data_file
+/data/misc_de/99/vold/test                                        vold_data_file
+/data/misc_ce/0/vold                                              vold_data_file
+/data/misc_ce/99/vold/test                                        vold_data_file
+
+/data/system_ce/0/backup                                          backup_data_file
+/data/system_ce/99/backup/test                                    backup_data_file
+/data/system_ce/0/backup_stage                                    backup_data_file
+/data/system_ce/99/backup_stage/test                              backup_data_file
+
+/efs                                                              efs_file
+/efs/test                                                         efs_file
+
+/cache                                                            cache_file
+/cache/test                                                       cache_file
+/cache/recovery                                                   cache_recovery_file
+/cache/recovery/test                                              cache_recovery_file
+/cache/backup_stage                                               cache_backup_file
+/cache/backup_stage/test                                          cache_backup_file
+/cache/backup                                                     cache_private_backup_file
+/cache/backup/test                                                cache_private_backup_file
+
+/cache/overlay                                                    overlayfs_file
+/cache/overlay/test                                               overlayfs_file
+/mnt/scratch                                                      overlayfs_file
+/mnt/scratch/test                                                 overlayfs_file
+
+/data/cache                                                       cache_file
+/data/cache/test                                                  cache_file
+/data/cache/recovery                                              cache_recovery_file
+/data/cache/recovery/test                                         cache_recovery_file
+/data/cache/backup_stage                                          cache_backup_file
+/data/cache/backup_stage/test                                     cache_backup_file
+/data/cache/backup                                                cache_private_backup_file
+/data/cache/backup/test                                           cache_private_backup_file
+
+/metadata                                                         metadata_file
+/metadata/test                                                    metadata_file
+/metadata/apex                                                    apex_metadata_file
+/metadata/apex/test                                               apex_metadata_file
+/metadata/vold                                                    vold_metadata_file
+/metadata/vold/test                                               vold_metadata_file
+/metadata/gsi                                                     gsi_metadata_file
+/metadata/gsi/test                                                gsi_metadata_file
+/metadata/gsi/dsu/active                                          gsi_public_metadata_file
+/metadata/gsi/dsu/booted                                          gsi_public_metadata_file
+/metadata/gsi/dsu/lp_names                                        gsi_public_metadata_file
+/metadata/gsi/dsu/test/metadata_encryption_dir                    gsi_public_metadata_file
+/metadata/gsi/ota                                                 ota_metadata_file
+/metadata/gsi/ota/test                                            ota_metadata_file
+/metadata/password_slots                                          password_slot_metadata_file
+/metadata/password_slots/test                                     password_slot_metadata_file
+/metadata/ota                                                     ota_metadata_file
+/metadata/ota/test                                                ota_metadata_file
+/metadata/bootstat                                                metadata_bootstat_file
+/metadata/bootstat/test                                           metadata_bootstat_file
+/metadata/staged-install                                          staged_install_file
+/metadata/staged-install/test                                     staged_install_file
+/metadata/userspacereboot                                         userspace_reboot_metadata_file
+/metadata/userspacereboot/test                                    userspace_reboot_metadata_file
+/metadata/watchdog                                                watchdog_metadata_file
+/metadata/watchdog/test                                           watchdog_metadata_file
+
+/mnt/asec                                                         asec_apk_file
+/mnt/asec/test                                                    asec_apk_file
+/mnt/asec/test/test.zip                                           asec_public_file
+/mnt/asec/test/lib                                                asec_public_file
+/mnt/asec/test/lib/test                                           asec_public_file
+/data/app-asec                                                    asec_image_file
+/data/app-asec/test                                               asec_image_file
+
+/mnt/media_rw                                                     mnt_media_rw_file
+/mnt/media_rw/test                                                mnt_media_rw_file
+/mnt/user                                                         mnt_user_file
+/mnt/user/test                                                    mnt_user_file
+/mnt/pass_through                                                 mnt_pass_through_file
+/mnt/pass_through/test                                            mnt_pass_through_file
+/mnt/sdcard                                                       mnt_sdcard_file
+/mnt/runtime                                                      storage_file
+/mnt/runtime/test                                                 storage_file
+/storage                                                          storage_file
+/storage/test                                                     storage_file
+
+/mnt/vendor                                                       mnt_vendor_file
+/mnt/vendor/test                                                  mnt_vendor_file
+
+/mnt/product                                                      mnt_product_file
+/mnt/product/test                                                 mnt_product_file
+
+/system/bin/check_dynamic_partitions                              postinstall_exec
+/product/bin/check_dynamic_partitions                             postinstall_exec
+/system/bin/otapreopt_script                                      postinstall_exec
+/product/bin/otapreopt_script                                     postinstall_exec
+/system/bin/otapreopt                                             postinstall_dexopt_exec
+/product/bin/otapreopt                                            postinstall_dexopt_exec
diff --git a/tools/checkfc.c b/tools/checkfc.c
index 83c631e..05826f9 100644
--- a/tools/checkfc.c
+++ b/tools/checkfc.c
@@ -7,6 +7,7 @@
 #include <sepol/module.h>
 #include <sepol/policydb/policydb.h>
 #include <sepol/sepol.h>
+#include <selinux/context.h>
 #include <selinux/selinux.h>
 #include <selinux/label.h>
 #include <sys/stat.h>
@@ -209,8 +210,14 @@
         "If -e is specified, then the context_file is allowed to be empty.\n\n"
 
         "usage2:  %s -c file_contexts1 file_contexts2\n\n"
-        "Compares two file contexts files and reports one of subset, equal, superset, or incomparable.\n\n",
-        name, name);
+        "Compares two file contexts files and reports one of \n"
+        "subset, equal, superset, or incomparable.\n\n"
+
+        "usage3:  %s -t file_contexts test_data\n\n"
+        "Validates a file contexts file against test_data.\n"
+        "test_data is a text file where each line has the format:\n"
+        "  path expected_type\n\n\n",
+        name, name, name);
     exit(1);
 }
 
@@ -264,6 +271,67 @@
      printf("%s\n", result_str[result]);
 }
 
+static void do_test_data_and_die_on_error(struct selinux_opt opts[], unsigned int backend,
+        char *paths[])
+{
+    opts[0].value = NULL; /* not validating against a policy */
+    opts[1].value = paths[0];
+    global_state.sepolicy.sehnd[0] = selabel_open(backend, opts, 2);
+    if (!global_state.sepolicy.sehnd[0]) {
+        fprintf(stderr, "Error: could not load context file from %s: %s\n",
+                paths[0], strerror(errno));
+        exit(1);
+    }
+
+    FILE* test_data = fopen(paths[1], "r");
+    if (test_data == NULL) {
+        fprintf(stderr, "Error: could not load test file from %s : %s\n",
+                paths[1], strerror(errno));
+        exit(1);
+    }
+
+    char line[1024];
+    while (fgets(line, sizeof(line), test_data)) {
+        char *path;
+        char *expected_type;
+
+        if (!strcmp(line, "\n") || line[0] == '#') {
+            continue;
+        }
+
+        int ret = sscanf(line, "%ms %ms", &path, &expected_type);
+        if (ret != 2) {
+            fprintf(stderr, "Error: unable to parse the line %s\n", line);
+            exit(1);
+        }
+
+        char *found_context;
+        ret = selabel_lookup(global_state.sepolicy.sehnd[0], &found_context, path, 0);
+        if (ret != 0) {
+            fprintf(stderr, "Error: unable to lookup the path for %s\n", line);
+            exit(1);
+        }
+
+        context_t found = context_new(found_context);
+        const char *found_type = context_type_get(found);
+
+        if (strcmp(found_type, expected_type)) {
+            fprintf(stderr, "Incorrect type for %s: resolved to %s, expected %s\n",
+                    path, found_type, expected_type);
+        }
+
+        free(found_context);
+        context_free(found);
+        free(path);
+        free(expected_type);
+    }
+    fclose(test_data);
+
+    // Prints the coverage of file_contexts on the test data. It includes
+    // warnings for rules that have not been hit by any test example.
+    selabel_stats(global_state.sepolicy.sehnd[0]);
+}
+
 static void do_fc_check_and_die_on_error(struct selinux_opt opts[], unsigned int backend, filemode mode,
         const char *sepolicy_file, const char *context_file, bool allow_empty)
 {
@@ -345,11 +413,12 @@
 
   bool allow_empty = false;
   bool compare = false;
+  bool test_data = false;
   char c;
 
   filemode mode = filemode_file_contexts;
 
-  while ((c = getopt(argc, argv, "clpsve")) != -1) {
+  while ((c = getopt(argc, argv, "clpsvet")) != -1) {
     switch (c) {
       case 'c':
         compare = true;
@@ -373,6 +442,9 @@
         mode = filemode_vendor_service_contexts;
         backend = SELABEL_CTX_ANDROID_SERVICE;
         break;
+      case 't':
+        test_data = true;
+        break;
       case 'h':
       default:
         usage(argv[0]);
@@ -385,7 +457,7 @@
     usage(argv[0]);
   }
 
-  if (compare && backend != SELABEL_CTX_FILE) {
+  if ((compare || test_data) && backend != SELABEL_CTX_FILE) {
     usage(argv[0]);
   }
 
@@ -393,6 +465,8 @@
 
   if (compare) {
       do_compare_and_die_on_error(opts, backend, &(argv[index]));
+  } else if (test_data) {
+      do_test_data_and_die_on_error(opts, backend, &(argv[index]));
   } else {
       /* remaining args are sepolicy file and context file  */
       char *sepolicy_file = argv[index];