1 # installer daemon 2 type installd, domain; 3 type installd_exec, exec_type, file_type; 4 typeattribute installd mlstrustedsubject; 5 allow installd self:capability { chown dac_override fowner fsetid setgid setuid sys_admin }; 6 7 # Allow labeling of files under /data/app/com.example/oat/ 8 allow installd dalvikcache_data_file:dir relabelto; 9 allow installd dalvikcache_data_file:file { relabelto link }; 10 11 # Allow movement of APK files between volumes 12 allow installd apk_data_file:dir { create_dir_perms relabelfrom }; 13 allow installd apk_data_file:file { create_file_perms relabelfrom link }; 14 allow installd apk_data_file:lnk_file { create r_file_perms unlink }; 15 16 allow installd asec_apk_file:file r_file_perms; 17 allow installd apk_tmp_file:file { r_file_perms unlink }; 18 allow installd apk_tmp_file:dir { relabelfrom create_dir_perms }; 19 allow installd oemfs:dir r_dir_perms; 20 allow installd oemfs:file r_file_perms; 21 allow installd cgroup:dir create_dir_perms; 22 allow installd cgroup:{ file lnk_file } create_file_perms; 23 allow installd mnt_expand_file:dir { search getattr }; 24 # Check validity of SELinux context before use. 25 selinux_check_context(installd) 26 27 r_dir_file(installd, rootfs) 28 # Scan through APKs in /system/app and /system/priv-app 29 r_dir_file(installd, system_file) 30 # Scan through APKs in /vendor/app 31 r_dir_file(installd, vendor_app_file) 32 # Scan through Runtime Resource Overlay APKs in /vendor/overlay 33 r_dir_file(installd, vendor_overlay_file) 34 # Get file context 35 allow installd file_contexts_file:file r_file_perms; 36 # Get seapp_context 37 allow installd seapp_contexts_file:file r_file_perms; 38 39 # Search /data/app-asec and stat files in it. 40 allow installd asec_image_file:dir search; 41 allow 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. 47 allow installd system_data_file:dir create_dir_perms; 48 allow installd system_data_file:lnk_file { create setattr unlink }; 49 50 # Upgrade /data/media for multi-user if necessary. 51 allow installd media_rw_data_file:dir create_dir_perms; 52 allow installd media_rw_data_file:file { getattr unlink }; 53 # restorecon new /data/media directory. 54 allow installd system_data_file:dir relabelfrom; 55 allow installd media_rw_data_file:dir relabelto; 56 57 # Delete /data/media files through sdcardfs, instead of going behind its back 58 allow installd tmpfs:dir r_dir_perms; 59 allow installd storage_file:dir search; 60 allow installd sdcardfs:dir { search open read write remove_name getattr rmdir }; 61 allow installd sdcardfs:file { getattr unlink }; 62 63 # Upgrade /data/misc/keychain for multi-user if necessary. 64 allow installd misc_user_data_file:dir create_dir_perms; 65 allow installd misc_user_data_file:file create_file_perms; 66 allow installd keychain_data_file:dir create_dir_perms; 67 allow installd keychain_data_file:file {r_file_perms unlink}; 68 69 # Create /data/.layout_version.* file 70 allow installd install_data_file:file create_file_perms; 71 72 # Create files under /data/dalvik-cache. 73 allow installd dalvikcache_data_file:dir create_dir_perms; 74 allow installd dalvikcache_data_file:file create_file_perms; 75 allow installd dalvikcache_data_file:lnk_file getattr; 76 77 # Create files under /data/resource-cache. 78 allow installd resourcecache_data_file:dir rw_dir_perms; 79 allow installd resourcecache_data_file:file create_file_perms; 80 81 # Upgrade from unlabeled userdata. 82 # Just need enough to remove and/or relabel it. 83 allow installd unlabeled:dir { getattr search relabelfrom rw_dir_perms rmdir }; 84 allow installd unlabeled:notdevfile_class_set { getattr relabelfrom rename unlink setattr }; 85 # Read pkg.apk file for input during dexopt. 86 allow 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. 91 allow 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. 98 allow 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 }; 106 107 allow 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/ 117 allow installd user_profile_data_file:dir create_dir_perms; 118 allow installd user_profile_data_file:file create_file_perms; 119 allow installd user_profile_data_file:dir rmdir; 120 allow installd user_profile_data_file:file unlink; 121 122 # Files created/updated by profman dumps. 123 allow installd profman_dump_data_file:dir { search add_name write }; 124 allow installd profman_dump_data_file:file { create setattr open write }; 125 126 # Create and use pty created by android_fork_execvp(). 127 allow installd devpts:chr_file rw_file_perms; 128 129 # execute toybox for app relocation 130 allow installd toolbox_exec:file rx_file_perms; 131 132 # Allow installd to publish a binder service and make binder calls. 133 binder_use(installd) 134 add_service(installd, installd_service) 135 allow installd dumpstate:fifo_file { getattr write }; 136 137 # Allow installd to call into the system server so it can check permissions. 138 binder_call(installd, system_server) 139 allow installd permission_service:service_manager find; 140 141 # Allow installd to read and write quotas 142 allow installd block_device:dir { search }; 143 allow 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 147 allow installd preloads_data_file:file { r_file_perms unlink }; 148 allow installd preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 149 allow installd preloads_media_file:file { r_file_perms unlink }; 150 allow 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 157 neverallow { domain -system_server -dumpstate -installd } installd_service:service_manager find; 158 neverallow { domain -system_server -dumpstate } installd:binder call; 159 neverallow installd { domain -system_server -servicemanager userdebug_or_eng(`-su') }:binder call; 160
