174 lines
6 KiB
Text
174 lines
6 KiB
Text
typeattribute app_zygote coredomain;
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######
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###### Policy below is different from regular zygote-spawned apps
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######
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# Allow access to temporary files, which is normally permitted through
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# a domain macro.
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tmpfs_domain(app_zygote);
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# Set the UID/GID of the process.
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# This will be further limited to a range of isolated UIDs with seccomp.
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allow app_zygote self:global_capability_class_set { setgid setuid };
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# Drop capabilities from bounding set.
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allow app_zygote self:global_capability_class_set setpcap;
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# Switch SELinux context to isolated app domain.
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allow app_zygote self:process setcurrent;
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allow app_zygote isolated_app:process dyntransition;
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# For JIT
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allow app_zygote self:process execmem;
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# Allow app_zygote to stat the files that it opens. It must
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# be able to inspect them so that it can reopen them on fork
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# if necessary: b/30963384.
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allow app_zygote debugfs_trace_marker:file getattr;
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# get system_server process group
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allow app_zygote system_server:process getpgid;
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# Interaction between the app_zygote and its children.
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allow app_zygote isolated_app:process setpgid;
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# TODO (b/63631799) fix this access
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dontaudit app_zygote mnt_expand_file:dir getattr;
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# Get seapp_contexts
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allow app_zygote seapp_contexts_file:file r_file_perms;
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# Check validity of SELinux context before use.
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selinux_check_context(app_zygote)
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# Check SELinux permissions.
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selinux_check_access(app_zygote)
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# Read and inspect temporary files managed by zygote.
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allow app_zygote zygote_tmpfs:file { read getattr };
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######
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###### Policy below is shared with regular zygote-spawned apps
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######
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# Child of zygote.
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allow app_zygote zygote:fd use;
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allow app_zygote zygote:process sigchld;
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# For ART (read /data/dalvik-cache).
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r_dir_file(app_zygote, dalvikcache_data_file);
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allow app_zygote dalvikcache_data_file:file execute;
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# Read /data/misc/apexdata/ to (get to com.android.art/dalvik-cache).
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allow app_zygote apex_module_data_file:dir search;
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# For ART APEX (read /data/misc/apexdata/com.android.art/dalvik-cache).
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r_dir_file(app_zygote, apex_art_data_file)
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# Allow reading/executing installed binaries to enable preloading
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# application data
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allow app_zygote apk_data_file:dir r_dir_perms;
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allow app_zygote apk_data_file:file { r_file_perms execute };
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# /oem accesses.
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allow app_zygote oemfs:dir search;
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# Allow app_zygote access to /vendor/overlay
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r_dir_file(app_zygote, vendor_overlay_file)
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allow app_zygote system_data_file:lnk_file r_file_perms;
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allow app_zygote system_data_file:file { getattr read map };
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# Send unsolicited message to system_server
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unix_socket_send(app_zygote, system_unsolzygote, system_server)
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# Allow the app_zygote to access the runtime feature flag properties.
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get_prop(app_zygote, device_config_runtime_native_prop)
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get_prop(app_zygote, device_config_runtime_native_boot_prop)
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# Allow app_zygote to access odsign verification status
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get_prop(app_zygote, odsign_prop)
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#####
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##### Neverallow
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#####
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# Only permit transition to isolated_app.
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neverallow app_zygote { domain -isolated_app }:process dyntransition;
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# Only setcon() transitions, no exec() based transitions, except for crash_dump.
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neverallow app_zygote { domain -crash_dump }:process transition;
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# Must not exec() a program without changing domains.
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# Having said that, exec() above is not allowed.
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neverallow app_zygote *:file execute_no_trans;
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# The only way to enter this domain is for the zygote to fork a new
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# app_zygote child.
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neverallow { domain -zygote } app_zygote:process dyntransition;
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# Disallow write access to properties.
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neverallow app_zygote property_socket:sock_file write;
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neverallow app_zygote property_type:property_service set;
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# Should not have any access to data files.
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neverallow app_zygote app_data_file_type:file { rwx_file_perms };
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neverallow app_zygote {
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service_manager_type
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-activity_service
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-webviewupdate_service
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}:service_manager find;
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# Isolated apps should not be able to access the driver directly.
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neverallow app_zygote gpu_device:chr_file { rwx_file_perms };
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# Do not allow app_zygote access to /cache.
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neverallow app_zygote cache_file:dir ~{ r_dir_perms };
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neverallow app_zygote cache_file:file ~{ read getattr };
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# Do not allow most socket access. This is socket_class_set, excluding unix_dgram_socket,
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# unix_stream_socket, and netlink_selinux_socket.
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neverallow app_zygote domain:{
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socket tcp_socket udp_socket rawip_socket netlink_socket packet_socket key_socket
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appletalk_socket netlink_route_socket netlink_tcpdiag_socket
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netlink_nflog_socket netlink_xfrm_socket netlink_audit_socket
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netlink_dnrt_socket netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket
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netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket
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netlink_generic_socket netlink_scsitransport_socket netlink_rdma_socket netlink_crypto_socket
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sctp_socket icmp_socket ax25_socket ipx_socket netrom_socket atmpvc_socket
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x25_socket rose_socket decnet_socket atmsvc_socket rds_socket irda_socket
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pppox_socket llc_socket can_socket tipc_socket bluetooth_socket iucv_socket
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rxrpc_socket isdn_socket phonet_socket ieee802154_socket caif_socket
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alg_socket nfc_socket vsock_socket kcm_socket qipcrtr_socket smc_socket
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} *;
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# Only allow app_zygote to talk to the logd socket, and
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# su/heapprofd/traced_perf on eng/userdebug. This is because
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# cap_setuid/cap_setgid allow to forge uid/gid in SCM_CREDENTIALS.
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# Think twice before changing.
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neverallow app_zygote {
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domain
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-app_zygote
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-logd
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-system_server
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userdebug_or_eng(`-su')
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userdebug_or_eng(`-heapprofd')
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userdebug_or_eng(`-traced_perf')
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}:unix_dgram_socket *;
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neverallow app_zygote {
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domain
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-app_zygote
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userdebug_or_eng(`-su')
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userdebug_or_eng(`-heapprofd')
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userdebug_or_eng(`-traced_perf')
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}:unix_stream_socket *;
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# Never allow ptrace
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neverallow app_zygote *:process ptrace;
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# Do not allow access to Bluetooth-related system properties.
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# neverallow rules for Bluetooth-related data files are listed above.
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neverallow app_zygote {
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bluetooth_a2dp_offload_prop
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bluetooth_audio_hal_prop
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bluetooth_prop
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exported_bluetooth_prop
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}:file create_file_perms;
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