Permissions for odrefresh and /data/misc/apexdata/com.android.art
odrefresh is the process responsible for checking and creating ART
compilation artifacts that live in the ART APEX data
directory (/data/misc/apexdata/com.android.art).
There are two types of change here:
1) enabling odrefresh to run dex2oat and write updated boot class path
and system server AOT artifacts into the ART APEX data directory.
2) enabling the zygote and assorted diagnostic tools to use the
updated AOT artifacts.
odrefresh uses two file contexts: apex_art_data_file and
apex_art_staging_data_file. When odrefresh invokes dex2oat, the
generated files have the apex_art_staging_data_file label (which allows
writing). odrefresh then moves these files from the staging area to
their installation area and gives them the apex_art_data_file label.
Bug: 160683548
Test: adb root && adb shell /apex/com.android.art/bin/odrefresh
Change-Id: I9fa290e0c9c1b7b82be4dacb9f2f8cb8c11e4895
diff --git a/private/odrefresh.te b/private/odrefresh.te
new file mode 100644
index 0000000..c1ccc38
--- /dev/null
+++ b/private/odrefresh.te
@@ -0,0 +1,32 @@
+# odrefresh
+type odrefresh, domain, coredomain;
+type odrefresh_exec, system_file_type, exec_type, file_type;
+
+# Allow odrefresh to create files and directories for on device signing.
+allow odrefresh apex_module_data_file:dir { getattr search };
+allow odrefresh apex_art_data_file:dir { create_dir_perms relabelfrom };
+allow odrefresh apex_art_data_file:file { open create write read getattr unlink };
+
+# Staging area labels (/data/misc/apexdata/com.android.art/staging). odrefresh
+# sets up files here and passes file descriptors for dex2oat to write to.
+allow odrefresh apex_art_staging_data_file:dir { create_dir_perms relabelto };
+allow odrefresh apex_art_staging_data_file:file create_file_perms;
+
+# Run dex2oat in its own sandbox.
+domain_auto_trans(odrefresh, dex2oat_exec, dex2oat)
+
+# Run dexoptanalyzer in its own sandbox.
+domain_auto_trans(odrefresh, dexoptanalyzer_exec, dexoptanalyzer)
+
+# Do not audit unused resources from parent processes (adb, shell, su).
+# These appear to be unnecessary for odrefresh.
+dontaudit odrefresh { adbd shell }:fd use;
+dontaudit odrefresh devpts:chr_file rw_file_perms;
+dontaudit odrefresh adbd:unix_stream_socket { getattr read write };
+
+# Allow odrefresh to read /apex/apex-info-list.xml to determine
+# whether current apex is in /system or /data.
+allow odrefresh apex_info_file:file r_file_perms;
+
+# No other processes should be creating files in the staging area.
+neverallow { domain -init -odrefresh } apex_art_staging_data_file:file open;