Add /data/fonts/files directory
The updated font files will be stored to /data/fonts/files and
all application will read it for drawing text.
Thus, /data/fonts/files needs to be readable by apps and only writable
by system_server (and init).
Bug: 173517579
Test: atest CtsGraphicsTestCases
Test: Manually done
Change-Id: Ia76b109704f6214eb3f1798e8d21260343eda231
diff --git a/private/system_server.te b/private/system_server.te
index 98c1a1b..b7dbed0 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -1039,6 +1039,13 @@
# Watchdog reads sysprops framework_watchdog.fatal_* to handle watchdog timeout loop.
get_prop(system_server, framework_watchdog_config_prop)
+
+# Font files are written by system server
+allow system_server font_data_file:file create_file_perms;
+allow system_server font_data_file:dir create_dir_perms;
+# Allow system process to setup fs-verity for font files
+allowxperm system_server font_data_file:file ioctl FS_IOC_ENABLE_VERITY;
+
###
### Neverallow rules
###
@@ -1270,3 +1277,7 @@
# BINDER_GET_FROZEN_INFO is used by system_server to determine the state of a frozen binder
# interface
neverallowxperm { domain -system_server } binder_device:chr_file ioctl { BINDER_FREEZE BINDER_GET_FROZEN_INFO };
+
+# Only system server can write the font files.
+neverallow { domain -init -system_server } font_data_file:file no_w_file_perms;
+neverallow { domain -init -system_server } font_data_file:dir no_w_dir_perms;