1# installer daemon 2type installd, domain; 3type installd_exec, system_file_type, exec_type, file_type; 4typeattribute installd mlstrustedsubject; 5allow installd self:global_capability_class_set { chown dac_override dac_read_search 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 16# FS_IOC_ENABLE_VERITY and FS_IOC_MEASURE_VERITY (or in old implementation used in installd, 17# FS_IOC_SET_VERITY_MEASUREMENT) ioctls on APKs in /data/app, to support fsverity. 18# TODO(b/120629632): this path is deprecated, remove when possible. 19allowxperm installd apk_data_file:file ioctl { 20 FS_IOC_ENABLE_VERITY FS_IOC_MEASURE_VERITY 21}; 22 23allow installd asec_apk_file:file r_file_perms; 24allow installd apk_tmp_file:file { r_file_perms unlink }; 25allow installd apk_tmp_file:dir { relabelfrom create_dir_perms }; 26allow installd oemfs:dir r_dir_perms; 27allow installd oemfs:file r_file_perms; 28allow installd cgroup:dir create_dir_perms; 29allow installd mnt_expand_file:dir { search getattr }; 30# Check validity of SELinux context before use. 31selinux_check_context(installd) 32 33r_dir_file(installd, rootfs) 34# Scan through APKs in /system/app and /system/priv-app 35r_dir_file(installd, system_file) 36# Scan through APKs in /vendor/app 37r_dir_file(installd, vendor_app_file) 38# Scan through JARs in /vendor/framework 39r_dir_file(installd, vendor_framework_file) 40# Scan through Runtime Resource Overlay APKs in /vendor/overlay 41r_dir_file(installd, vendor_overlay_file) 42# Get file context 43allow installd file_contexts_file:file r_file_perms; 44# Get seapp_context 45allow installd seapp_contexts_file:file r_file_perms; 46 47# Search /data/app-asec and stat files in it. 48allow installd asec_image_file:dir search; 49allow installd asec_image_file:file getattr; 50 51# Create /data/user and /data/user/0 if necessary. 52# Also required to initially create /data/data subdirectories 53# and lib symlinks before the setfilecon call. May want to 54# move symlink creation after setfilecon in installd. 55allow installd system_data_file:dir create_dir_perms; 56# Also, allow read for lnk_file so that we can process /data/user/0 links when 57# optimizing application code. 58allow installd system_data_file:lnk_file { create getattr read setattr unlink }; 59 60# Manage lower filesystem via pass_through mounts 61allow installd mnt_pass_through_file:dir r_dir_perms; 62 63# Upgrade /data/media for multi-user if necessary. 64allow installd media_rw_data_file:dir create_dir_perms; 65allow installd media_rw_data_file:file { getattr unlink }; 66# restorecon new /data/media directory. 67allow installd system_data_file:dir relabelfrom; 68allow installd media_rw_data_file:dir relabelto; 69 70# Delete /data/media files through sdcardfs, instead of going behind its back 71allow installd tmpfs:dir r_dir_perms; 72allow installd storage_file:dir search; 73allow installd sdcard_type:dir { search open read write remove_name getattr rmdir }; 74allow installd sdcard_type:file { getattr unlink }; 75 76# Create app's mirror data directory in /data_mirror, and bind mount the real directory to it 77allow installd mirror_data_file:dir { create_dir_perms mounton }; 78 79# Upgrade /data/misc/keychain for multi-user if necessary. 80allow installd misc_user_data_file:dir create_dir_perms; 81allow installd misc_user_data_file:file create_file_perms; 82allow installd keychain_data_file:dir create_dir_perms; 83allow installd keychain_data_file:file {r_file_perms unlink}; 84 85# Create /data/misc/installd/layout_version.* file 86allow installd install_data_file:file create_file_perms; 87allow installd install_data_file:dir rw_dir_perms; 88 89# Create files under /data/dalvik-cache. 90allow installd dalvikcache_data_file:dir create_dir_perms; 91allow installd dalvikcache_data_file:file create_file_perms; 92allow installd dalvikcache_data_file:lnk_file getattr; 93 94# Create files under /data/resource-cache. 95allow installd resourcecache_data_file:dir rw_dir_perms; 96allow installd resourcecache_data_file:file create_file_perms; 97 98# Upgrade from unlabeled userdata. 99# Just need enough to remove and/or relabel it. 100allow installd unlabeled:dir { getattr search relabelfrom rw_dir_perms rmdir }; 101allow installd unlabeled:notdevfile_class_set { getattr relabelfrom rename unlink setattr }; 102# Read pkg.apk file for input during dexopt. 103allow installd unlabeled:file r_file_perms; 104 105# Upgrade from before system_app_data_file was used for system UID apps. 106# Just need enough to relabel it and to unlink removed package files. 107# Directory access covered by earlier rule above. 108allow installd system_data_file:notdevfile_class_set { getattr relabelfrom unlink }; 109 110# Manage /data/data subdirectories, including initially labeling them 111# upon creation via setfilecon or running restorecon_recursive, 112# setting owner/mode, creating symlinks within them, and deleting them 113# upon package uninstall. 114 115# Types extracted from seapp_contexts type= fields. 116allow installd { 117 system_app_data_file 118 bluetooth_data_file 119 nfc_data_file 120 radio_data_file 121 shell_data_file 122 app_data_file 123 privapp_data_file 124}:dir { create_dir_perms relabelfrom relabelto }; 125 126allow installd { 127 system_app_data_file 128 bluetooth_data_file 129 nfc_data_file 130 radio_data_file 131 shell_data_file 132 app_data_file 133 privapp_data_file 134}:notdevfile_class_set { create_file_perms relabelfrom relabelto }; 135 136# Allow zygote to unmount mirror directories 137allow installd labeledfs:filesystem unmount; 138 139# Similar for the files under /data/misc/profiles/ 140allow installd user_profile_data_file:dir create_dir_perms; 141allow installd user_profile_data_file:file create_file_perms; 142allow installd user_profile_data_file:dir rmdir; 143allow installd user_profile_data_file:file unlink; 144 145# Files created/updated by profman dumps. 146allow installd profman_dump_data_file:dir { search add_name write }; 147allow installd profman_dump_data_file:file { create setattr open write }; 148 149# Create and use pty created by android_fork_execvp(). 150allow installd devpts:chr_file rw_file_perms; 151 152# execute toybox for app relocation 153allow installd toolbox_exec:file rx_file_perms; 154 155# Allow installd to publish a binder service and make binder calls. 156binder_use(installd) 157add_service(installd, installd_service) 158allow installd dumpstate:fifo_file { getattr write }; 159 160# Allow installd to call into the system server so it can check permissions. 161binder_call(installd, system_server) 162allow installd permission_service:service_manager find; 163 164# Allow installd to read and write quotas 165allow installd block_device:dir { search }; 166allow installd labeledfs:filesystem { quotaget quotamod }; 167 168# Allow installd to delete from /data/preloads when trimming data caches 169# TODO b/34690396 Remove when time-based purge policy for preloads is implemented in system_server 170allow installd preloads_data_file:file { r_file_perms unlink }; 171allow installd preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 172allow installd preloads_media_file:file { r_file_perms unlink }; 173allow installd preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 174 175# Allow installd to read /proc/filesystems 176allow installd proc_filesystems:file r_file_perms; 177 178### 179### Neverallow rules 180### 181 182# only system_server, installd, dumpstate, and servicemanager may interact with installd over binder 183neverallow { domain -system_server -dumpstate -installd } installd_service:service_manager find; 184neverallow { domain -system_server -dumpstate -servicemanager } installd:binder call; 185neverallow installd { 186 domain 187 -system_server 188 -servicemanager 189 userdebug_or_eng(`-su') 190}:binder call; 191