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