1 ### 2 ### Services with isolatedProcess=true in their manifest. 3 ### 4 ### This file defines the rules for isolated apps. An "isolated 5 ### app" is an APP with UID between AID_ISOLATED_START (99000) 6 ### and AID_ISOLATED_END (99999). 7 ### 8 9 typeattribute isolated_app coredomain; 10 11 app_domain(isolated_app) 12 13 # Access already open app data files received over Binder or local socket IPC. 14 allow isolated_app app_data_file:file { append read write getattr lock }; 15 16 allow isolated_app activity_service:service_manager find; 17 allow isolated_app display_service:service_manager find; 18 allow isolated_app webviewupdate_service:service_manager find; 19 20 # Google Breakpad (crash reporter for Chrome) relies on ptrace 21 # functionality. Without the ability to ptrace, the crash reporter 22 # tool is broken. 23 # b/20150694 24 # https://code.google.com/p/chromium/issues/detail?id=475270 25 allow isolated_app self:process ptrace; 26 27 # b/32896414: Allow accessing sdcard file descriptors passed to isolated_apps 28 # by other processes. Open should never be allowed, and is blocked by 29 # neverallow rules below. 30 # TODO: consider removing write/append. We want to limit isolated_apps 31 # ability to mutate files of any type. 32 # media_rw_data_file is included for sdcardfs, and can be removed if sdcardfs 33 # is modified to change the secontext when accessing the lower filesystem. 34 allow isolated_app { sdcard_type media_rw_data_file }:file { read write append getattr lock }; 35 auditallow isolated_app { sdcard_type media_rw_data_file }:file { write append }; 36 37 # For webviews, isolated_app processes can be forked from the webview_zygote 38 # in addition to the zygote. Allow access to resources inherited from the 39 # webview_zygote process. These rules are specialized copies of the ones in app.te. 40 # Inherit FDs from the webview_zygote. 41 allow isolated_app webview_zygote:fd use; 42 # Notify webview_zygote of child death. 43 allow isolated_app webview_zygote:process sigchld; 44 # Inherit logd write socket. 45 allow isolated_app webview_zygote:unix_dgram_socket write; 46 # Read system properties managed by webview_zygote. 47 allow isolated_app webview_zygote_tmpfs:file read; 48 49 ##### 50 ##### Neverallow 51 ##### 52 53 # Do not allow isolated_app to directly open tun_device 54 neverallow isolated_app tun_device:chr_file open; 55 56 # Isolated apps should not directly open app data files themselves. 57 neverallow isolated_app app_data_file:file open; 58 59 # Only allow appending to /data/anr/traces.txt (b/27853304, b/18340553) 60 # TODO: are there situations where isolated_apps write to this file? 61 # TODO: should we tighten these restrictions further? 62 neverallow isolated_app anr_data_file:file ~{ open append }; 63 neverallow isolated_app anr_data_file:dir ~search; 64 65 # b/17487348 66 # Isolated apps can only access three services, 67 # activity_service, display_service and webviewupdate_service. 68 neverallow isolated_app { 69 service_manager_type 70 -activity_service 71 -display_service 72 -webviewupdate_service 73 }:service_manager find; 74 75 # Isolated apps shouldn't be able to access the driver directly. 76 neverallow isolated_app gpu_device:chr_file { rw_file_perms execute }; 77 78 # Do not allow isolated_app access to /cache 79 neverallow isolated_app cache_file:dir ~{ r_dir_perms }; 80 neverallow isolated_app cache_file:file ~{ read getattr }; 81 82 # Do not allow isolated_app to access external storage, except for files passed 83 # via file descriptors (b/32896414). 84 neverallow isolated_app { storage_file mnt_user_file sdcard_type }:dir ~getattr; 85 neverallow isolated_app { storage_file mnt_user_file }:file_class_set *; 86 neverallow isolated_app sdcard_type:{ devfile_class_set lnk_file sock_file fifo_file } *; 87 neverallow isolated_app sdcard_type:file ~{ read write append getattr lock }; 88 89 # Do not allow USB access 90 neverallow isolated_app { usb_device usbaccessory_device }:chr_file *; 91 92 # Restrict the webview_zygote control socket. 93 neverallow isolated_app webview_zygote_socket:sock_file write; 94
