1# installer daemon 2type installd, domain; 3type installd_exec, exec_type, file_type; 4typeattribute installd mlstrustedsubject; 5allow installd self:capability { chown dac_override fowner fsetid setgid setuid sys_admin }; 6 7# Allow labeling of files under /data/app/com.example/oat/ 8allow installd dalvikcache_data_file:dir relabelto; 9allow installd dalvikcache_data_file:file { relabelto link }; 10 11# Allow movement of APK files between volumes 12allow installd apk_data_file:dir { create_dir_perms relabelfrom }; 13allow installd apk_data_file:file { create_file_perms relabelfrom link }; 14allow installd apk_data_file:lnk_file { create r_file_perms unlink }; 15 16allow installd asec_apk_file:file r_file_perms; 17allow installd apk_tmp_file:file { r_file_perms unlink }; 18allow installd apk_tmp_file:dir { relabelfrom create_dir_perms }; 19allow installd oemfs:dir r_dir_perms; 20allow installd oemfs:file r_file_perms; 21allow installd cgroup:dir create_dir_perms; 22allow installd cgroup:{ file lnk_file } create_file_perms; 23allow installd mnt_expand_file:dir { search getattr }; 24# Check validity of SELinux context before use. 25selinux_check_context(installd) 26 27r_dir_file(installd, rootfs) 28# Scan through APKs in /system/app and /system/priv-app 29r_dir_file(installd, system_file) 30# Scan through APKs in /vendor/app 31r_dir_file(installd, vendor_app_file) 32# Scan through Runtime Resource Overlay APKs in /vendor/overlay 33r_dir_file(installd, vendor_overlay_file) 34# Get file context 35allow installd file_contexts_file:file r_file_perms; 36# Get seapp_context 37allow installd seapp_contexts_file:file r_file_perms; 38 39# Search /data/app-asec and stat files in it. 40allow installd asec_image_file:dir search; 41allow installd asec_image_file:file getattr; 42 43# Create /data/user and /data/user/0 if necessary. 44# Also required to initially create /data/data subdirectories 45# and lib symlinks before the setfilecon call. May want to 46# move symlink creation after setfilecon in installd. 47allow installd system_data_file:dir create_dir_perms; 48allow installd system_data_file:lnk_file { create setattr unlink }; 49 50# Upgrade /data/media for multi-user if necessary. 51allow installd media_rw_data_file:dir create_dir_perms; 52allow installd media_rw_data_file:file { getattr unlink }; 53# restorecon new /data/media directory. 54allow installd system_data_file:dir relabelfrom; 55allow installd media_rw_data_file:dir relabelto; 56 57# Delete /data/media files through sdcardfs, instead of going behind its back 58allow installd tmpfs:dir r_dir_perms; 59allow installd storage_file:dir search; 60allow installd sdcardfs:dir { search open read write remove_name getattr rmdir }; 61allow installd sdcardfs:file { getattr unlink }; 62 63# Upgrade /data/misc/keychain for multi-user if necessary. 64allow installd misc_user_data_file:dir create_dir_perms; 65allow installd misc_user_data_file:file create_file_perms; 66allow installd keychain_data_file:dir create_dir_perms; 67allow installd keychain_data_file:file {r_file_perms unlink}; 68 69# Create /data/.layout_version.* file 70allow installd install_data_file:file create_file_perms; 71 72# Create files under /data/dalvik-cache. 73allow installd dalvikcache_data_file:dir create_dir_perms; 74allow installd dalvikcache_data_file:file create_file_perms; 75allow installd dalvikcache_data_file:lnk_file getattr; 76 77# Create files under /data/resource-cache. 78allow installd resourcecache_data_file:dir rw_dir_perms; 79allow installd resourcecache_data_file:file create_file_perms; 80 81# Upgrade from unlabeled userdata. 82# Just need enough to remove and/or relabel it. 83allow installd unlabeled:dir { getattr search relabelfrom rw_dir_perms rmdir }; 84allow installd unlabeled:notdevfile_class_set { getattr relabelfrom rename unlink setattr }; 85# Read pkg.apk file for input during dexopt. 86allow installd unlabeled:file r_file_perms; 87 88# Upgrade from before system_app_data_file was used for system UID apps. 89# Just need enough to relabel it and to unlink removed package files. 90# Directory access covered by earlier rule above. 91allow installd system_data_file:notdevfile_class_set { getattr relabelfrom unlink }; 92 93# Manage /data/data subdirectories, including initially labeling them 94# upon creation via setfilecon or running restorecon_recursive, 95# setting owner/mode, creating symlinks within them, and deleting them 96# upon package uninstall. 97# Types extracted from seapp_contexts type= fields. 98allow installd { 99 system_app_data_file 100 bluetooth_data_file 101 nfc_data_file 102 radio_data_file 103 shell_data_file 104 app_data_file 105}:dir { create_dir_perms relabelfrom relabelto }; 106 107allow installd { 108 system_app_data_file 109 bluetooth_data_file 110 nfc_data_file 111 radio_data_file 112 shell_data_file 113 app_data_file 114}:notdevfile_class_set { create_file_perms relabelfrom relabelto }; 115 116# Similar for the files under /data/misc/profiles/ 117allow installd user_profile_data_file:dir create_dir_perms; 118allow installd user_profile_data_file:file create_file_perms; 119allow installd user_profile_data_file:dir rmdir; 120allow installd user_profile_data_file:file unlink; 121 122# Files created/updated by profman dumps. 123allow installd profman_dump_data_file:dir { search add_name write }; 124allow installd profman_dump_data_file:file { create setattr open write }; 125 126# Create and use pty created by android_fork_execvp(). 127allow installd devpts:chr_file rw_file_perms; 128 129# execute toybox for app relocation 130allow installd toolbox_exec:file rx_file_perms; 131 132# Allow installd to publish a binder service and make binder calls. 133binder_use(installd) 134add_service(installd, installd_service) 135allow installd dumpstate:fifo_file { getattr write }; 136 137# Allow installd to call into the system server so it can check permissions. 138binder_call(installd, system_server) 139allow installd permission_service:service_manager find; 140 141# Allow installd to read and write quotas 142allow installd block_device:dir { search }; 143allow installd labeledfs:filesystem { quotaget quotamod }; 144 145# Allow installd to delete from /data/preloads when trimming data caches 146# TODO b/34690396 Remove when time-based purge policy for preloads is implemented in system_server 147allow installd preloads_data_file:file { r_file_perms unlink }; 148allow installd preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 149allow installd preloads_media_file:file { r_file_perms unlink }; 150allow installd preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 151 152### 153### Neverallow rules 154### 155 156# only system_server, installd and dumpstate may interact with installd over binder 157neverallow { domain -system_server -dumpstate -installd } installd_service:service_manager find; 158neverallow { domain -system_server -dumpstate } installd:binder call; 159neverallow installd { domain -system_server -servicemanager userdebug_or_eng(`-su') }:binder call; 160