am 1c8464e1: App data backup security policy.

* commit '1c8464e1':
  App data backup security policy.

app.te

@@ -201,3 +201,10 @@ r_dir_file(appdomain, isolated_app)
 # are examined.
 allow appdomain isolated_app:unix_stream_socket { read write };
 allow isolated_app appdomain:unix_stream_socket { read write };
+
+# Backup ability for every app. BMS opens and passes the fd
+# to any app that has backup ability. Hence, no open permissions here.
+allow { appdomain isolated_app } backup_data_file:file { read write };
+allow { appdomain isolated_app } cache_backup_file:file { read write };
+# Backup ability using 'adb backup'
+allow { appdomain isolated_app } system_data_file:lnk_file getattr;

file.te

@@ -55,6 +55,9 @@ type app_data_file, file_type, data_file_type;
 type platform_app_data_file, file_type, data_file_type, mlstrustedobject;
 # Default type for anything under /cache
 type cache_file, file_type, mlstrustedobject;
+# Type for /cache/.*\.{data|restore} and default
+# type for anything under /cache/backup
+type cache_backup_file, file_type, mlstrustedobject;
 # Default type for anything under /efs
 type efs_file, file_type;
 # Type for wallpaper file.
@@ -63,6 +66,8 @@ type wallpaper_file, file_type, mlstrustedobject;
 type asec_apk_file, file_type, data_file_type;
 # /data/app-asec
 type asec_image_file, file_type, data_file_type;
+# /data/backup and /data/secure/backup
+type backup_data_file, file_type, data_file_type, mlstrustedobject;
 
 # All devices have bluetooth efs files. But they
 # vary per device, so this type is used in per

file_contexts

@@ -140,6 +140,8 @@
 # Data files
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/backup(/.*)?		u:object_r:backup_data_file:s0
+/data/secure/backup(/.*)?	u:object_r:backup_data_file:s0
 /data/drm(/.*)?		u:object_r:drm_data_file:s0
 /data/gps(/.*)?		u:object_r:gps_data_file:s0
 /data/dalvik-cache(/.*)? u:object_r:dalvikcache_data_file:s0
@@ -170,6 +172,10 @@
 # Cache files
 #
 /cache(/.*)?		u:object_r:cache_file:s0
+/cache/.*\.data	u:object_r:cache_backup_file:s0
+/cache/.*\.restore	u:object_r:cache_backup_file:s0
+# LocalTransport (backup) uses this directory
+/cache/backup(/.*)?	u:object_r:cache_backup_file:s0
 #############################
 # sysfs files
 #

system.te

@@ -189,8 +189,8 @@ type_transition system wifi_data_file:sock_file system_wpa_socket;
 allow system system_wpa_socket:sock_file create_file_perms;
 
 # Manage cache files.
-allow system cache_file:dir create_dir_perms;
-allow system cache_file:file create_file_perms;
+allow system cache_file:dir { relabelfrom create_dir_perms };
+allow system cache_file:file { relabelfrom create_file_perms };
 
 # Run system programs, e.g. dexopt.
 allow system system_file:file x_file_perms;
@@ -212,3 +212,12 @@ allow system rild:unix_stream_socket connectto;
 
 # connect to vpn tunnel
 allow system mtp:unix_stream_socket { connectto };
+
+# BackupManagerService lets PMS create a data backup file
+allow system cache_backup_file:file create_file_perms;
+# Relabel /data/backup
+allow system backup_data_file:dir { relabelto relabelfrom };
+# Relabel /cache/.*\.{data|restore}
+allow system cache_backup_file:file { relabelto relabelfrom };
+# LocalTransport creates and relabels /cache/backup
+allow system cache_backup_file:dir { relabelto relabelfrom create_dir_perms };