36fb1f1bf3
Netlink uevent sockets are used by the kernel to inform userspace
when certain events occur, for example, when new hardware is added
or removed. This allows userspace to take some action based on those
messages.
Relax the neverallow rule for NETLINK_KOBJECT_UEVENT sockets.
Certain device specific app domains, such as system_app, may have a
need to receive messages from this socket type.
Continue to neverallow NETLINK_KOBJECT_UEVENT sockets for untrusted_app.
These sockets have been the source of rooting attacks in Android
in the past, and it doesn't make sense to expose this to untrusted_apps.
No new SELinux rules are introduced by this change. This is an
adjustment of compile time assertions only.
Bug: 17525863
(cherry picked from commit 642b80427e)
Change-Id: I35f3dc8b1ead9f427645a13fb202e760d1e68e64
346 lines
13 KiB
Text
346 lines
13 KiB
Text
###
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### Domain for all zygote spawned apps
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###
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### This file is the base policy for all zygote spawned apps.
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### Other policy files, such as isolated_app.te, untrusted_app.te, etc
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### extend from this policy. Only policies which should apply to ALL
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### zygote spawned apps should be added here.
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###
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# Dalvik Compiler JIT Mapping.
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allow appdomain self:process execmem;
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allow appdomain ashmem_device:chr_file execute;
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# Receive and use open file descriptors inherited from zygote.
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allow appdomain zygote:fd use;
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# gdbserver for ndk-gdb reads the zygote.
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# valgrind needs mmap exec for zygote
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allow appdomain zygote_exec:file rx_file_perms;
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# gdbserver for ndk-gdb ptrace attaches to app process.
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allow appdomain self:process ptrace;
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# Read system properties managed by zygote.
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allow appdomain zygote_tmpfs:file read;
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# Notify zygote of death;
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allow appdomain zygote:process sigchld;
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# Notify shell and adbd of death when spawned via runas for ndk-gdb.
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allow appdomain shell:process sigchld;
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allow appdomain adbd:process sigchld;
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# child shell or gdbserver pty access for runas.
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allow appdomain devpts:chr_file { getattr read write ioctl };
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# Use pipes and sockets provided by system_server via binder or local socket.
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allow appdomain system_server:fifo_file rw_file_perms;
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allow appdomain system_server:unix_stream_socket { read write setopt getattr getopt shutdown };
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allow appdomain system_server:tcp_socket { read write getattr getopt shutdown };
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# Communication with other apps via fifos
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allow appdomain appdomain:fifo_file rw_file_perms;
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# Communicate with surfaceflinger.
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allow appdomain surfaceflinger:unix_stream_socket { read write setopt getattr getopt shutdown };
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# App sandbox file accesses.
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allow appdomain app_data_file:dir create_dir_perms;
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allow appdomain app_data_file:notdevfile_class_set create_file_perms;
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# lib subdirectory of /data/data dir is system-owned.
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allow appdomain system_data_file:dir r_dir_perms;
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allow appdomain system_data_file:file { execute execute_no_trans open execmod };
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# Access to OEM provided data and apps
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allow appdomain oemfs:dir r_dir_perms;
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allow appdomain oemfs:file rx_file_perms;
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# Execute the shell or other system executables.
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allow appdomain shell_exec:file rx_file_perms;
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allow appdomain system_file:file rx_file_perms;
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# Execute dex2oat when apps call dexclassloader
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allow appdomain dex2oat_exec:file rx_file_perms;
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# Read/write wallpaper file (opened by system).
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allow appdomain wallpaper_file:file { getattr read write };
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# Write to /data/anr/traces.txt.
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allow appdomain anr_data_file:dir search;
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allow appdomain anr_data_file:file { open append };
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# Allow apps to send dump information to dumpstate
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allow appdomain dumpstate:fd use;
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allow appdomain dumpstate:unix_stream_socket { read write getopt getattr shutdown };
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allow appdomain shell_data_file:file { write getattr };
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# Write to /proc/net/xt_qtaguid/ctrl file.
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allow appdomain qtaguid_proc:file rw_file_perms;
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# Everybody can read the xt_qtaguid resource tracking misc dev.
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# So allow all apps to read from /dev/xt_qtaguid.
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allow appdomain qtaguid_device:chr_file r_file_perms;
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# Grant GPU access to all processes started by Zygote.
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# They need that to render the standard UI.
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allow appdomain gpu_device:chr_file { rw_file_perms execute };
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# Use the Binder.
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binder_use(appdomain)
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# Perform binder IPC to binder services.
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binder_call(appdomain, binderservicedomain)
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# Perform binder IPC to other apps.
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binder_call(appdomain, appdomain)
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# Already connected, unnamed sockets being passed over some other IPC
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# hence no sock_file or connectto permission. This appears to be how
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# Chrome works, may need to be updated as more apps using isolated services
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# are examined.
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allow appdomain appdomain:unix_stream_socket { getopt getattr read write shutdown };
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# Backup ability for every app. BMS opens and passes the fd
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# to any app that has backup ability. Hence, no open permissions here.
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allow appdomain backup_data_file:file { read write getattr };
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allow appdomain cache_backup_file:file { read write getattr };
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allow appdomain cache_backup_file:dir getattr;
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# Backup ability using 'adb backup'
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allow appdomain system_data_file:lnk_file getattr;
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# Allow read/stat of /data/media files passed by Binder or local socket IPC.
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allow appdomain media_rw_data_file:file { read getattr };
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# Read and write /data/data/com.android.providers.telephony files passed over Binder.
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allow appdomain radio_data_file:file { read write getattr };
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# Read and write system app data files passed over Binder.
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# Motivating case was /data/data/com.android.settings/cache/*.jpg for
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# cropping or taking user photos.
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allow untrusted_app system_app_data_file:file { read write getattr };
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# Access SDcard via the fuse mount.
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allow appdomain fuse:dir create_dir_perms;
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allow appdomain fuse:file create_file_perms;
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# Allow apps to use the USB Accessory interface.
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# http://developer.android.com/guide/topics/connectivity/usb/accessory.html
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#
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# USB devices are first opened by the system server (USBDeviceManagerService)
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# and the file descriptor is passed to the right Activity via binder.
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allow appdomain usb_device:chr_file { read write getattr ioctl };
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allow appdomain usbaccessory_device:chr_file { read write getattr };
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# For art.
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allow appdomain dalvikcache_data_file:file execute;
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# /data/dalvik-cache/profiles
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allow appdomain dalvikcache_profiles_data_file:dir { search getattr };
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allow appdomain dalvikcache_profiles_data_file:file rw_file_perms;
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# Allow any app to read shared RELRO files.
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allow appdomain shared_relro_file:dir search;
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allow appdomain shared_relro_file:file r_file_perms;
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# Allow apps to read/execute installed binaries
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allow appdomain apk_data_file:dir r_dir_perms;
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allow appdomain apk_data_file:file { rx_file_perms execmod };
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# /data/resource-cache
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allow appdomain resourcecache_data_file:file r_file_perms;
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allow appdomain resourcecache_data_file:dir r_dir_perms;
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###
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### CTS-specific rules
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###
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# For cts/tools/device-setup/TestDeviceSetup/src/android/tests/getinfo/RootProcessScanner.java.
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# Reads /proc/pid/status and statm entries to check that
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# no unexpected root processes are running.
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# Also for cts/tests/tests/security/src/android/security/cts/VoldExploitTest.java
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# Reads /proc/pid/cmdline of vold.
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allow appdomain domain:dir { open read search getattr };
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allow appdomain domain:{ file lnk_file } { open read getattr };
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# For cts/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java.
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# testRunAsHasCorrectCapabilities
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allow appdomain runas_exec:file getattr;
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# Others are either allowed elsewhere or not desired.
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# For cts/tests/tests/security/src/android/security/cts/SELinuxTest.java
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# Check SELinux policy and contexts.
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selinux_check_access(appdomain)
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selinux_check_context(appdomain)
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# Validate that each process is running in the correct security context.
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allow appdomain domain:process getattr;
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# logd access
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read_logd(appdomain)
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control_logd(appdomain)
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# application inherit logd write socket (urge is to deprecate this long term)
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allow appdomain zygote:unix_dgram_socket write;
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allow appdomain keystore:keystore_key { test get insert delete exist saw sign verify };
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use_keystore(appdomain)
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###
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### Neverallow rules
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###
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### These are things that Android apps should NEVER be able to do
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###
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# Superuser capabilities.
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# bluetooth requires net_admin and wake_alarm.
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neverallow { appdomain -bluetooth } self:capability *;
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neverallow { appdomain -bluetooth } self:capability2 *;
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# Block device access.
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neverallow appdomain dev_type:blk_file { read write };
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# Access to any of the following character devices.
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neverallow appdomain {
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audio_device
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camera_device
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dm_device
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radio_device
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gps_device
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rpmsg_device
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}:chr_file { read write };
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# Note: Try expanding list of app domains in the future.
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neverallow { untrusted_app isolated_app shell } graphics_device:chr_file { read write };
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neverallow { appdomain -nfc } nfc_device:chr_file
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{ read write };
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neverallow { appdomain -bluetooth } hci_attach_dev:chr_file
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{ read write };
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neverallow appdomain tee_device:chr_file { read write };
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# Privileged netlink socket interfaces.
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neverallow appdomain
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self:{
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netlink_socket
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netlink_firewall_socket
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netlink_tcpdiag_socket
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netlink_nflog_socket
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netlink_xfrm_socket
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netlink_audit_socket
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netlink_ip6fw_socket
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netlink_dnrt_socket
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} *;
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# These messages are broadcast messages from the kernel to userspace.
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# Do not allow the writing of netlink messages, which has been a source
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# of rooting vulns in the past.
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neverallow appdomain self:netlink_kobject_uevent_socket { write append };
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# Sockets under /dev/socket that are not specifically typed.
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neverallow appdomain socket_device:sock_file write;
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# Unix domain sockets.
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neverallow appdomain adbd_socket:sock_file write;
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neverallow appdomain installd_socket:sock_file write;
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neverallow { appdomain -bluetooth -radio -shell -system_app }
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property_socket:sock_file write;
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neverallow { appdomain -radio } rild_socket:sock_file write;
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neverallow appdomain vold_socket:sock_file write;
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neverallow appdomain zygote_socket:sock_file write;
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# ptrace access to non-app domains.
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neverallow appdomain { domain -appdomain }:process ptrace;
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# Write access to /proc/pid entries for any non-app domain.
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neverallow appdomain { domain -appdomain }:file write;
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# signal access to non-app domains.
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# sigchld allowed for parent death notification.
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# signull allowed for kill(pid, 0) existence test.
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# All others prohibited.
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neverallow appdomain { domain -appdomain }:process
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{ sigkill sigstop signal };
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# Transition to a non-app domain.
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# Exception for the shell domain, can transition to runas, etc.
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neverallow { appdomain -shell } { domain -appdomain }:process
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{ transition dyntransition };
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# Write to rootfs.
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neverallow appdomain rootfs:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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# Write to /system.
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neverallow appdomain system_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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# Write to entrypoint executables.
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neverallow appdomain exec_type:file
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{ create write setattr relabelfrom relabelto append unlink link rename };
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# Write to system-owned parts of /data.
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# This is the default type for anything under /data not otherwise
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# specified in file_contexts. Define a different type for portions
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# that should be writable by apps.
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# Exception for system_app for Settings.
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neverallow { appdomain -system_app }
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system_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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# Write to various other parts of /data.
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neverallow appdomain drm_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow appdomain gps_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -platform_app }
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apk_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -platform_app }
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apk_tmp_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -platform_app }
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apk_private_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -platform_app }
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apk_private_tmp_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -shell }
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shell_data_file:dir_file_class_set
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{ create setattr relabelfrom relabelto append unlink link rename };
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neverallow { appdomain -bluetooth }
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bluetooth_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow appdomain
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keystore_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow appdomain
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systemkeys_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow appdomain
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wifi_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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neverallow appdomain
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dhcp_data_file:dir_file_class_set
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{ create write setattr relabelfrom relabelto append unlink link rename };
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# Access to factory files.
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neverallow appdomain
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efs_file:dir_file_class_set { read write };
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# Write to various pseudo file systems.
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neverallow { appdomain -bluetooth -nfc }
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sysfs:dir_file_class_set write;
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neverallow appdomain
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proc:dir_file_class_set write;
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# Access to syslog(2) or /proc/kmsg.
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neverallow { appdomain -system_app }
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kernel:system { syslog_mod syslog_console };
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neverallow { appdomain -system_app -shell }
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kernel:system syslog_read;
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# Ability to perform any filesystem operation other than statfs(2).
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# i.e. no mount(2), unmount(2), etc.
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neverallow appdomain fs_type:filesystem ~getattr;
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# Ability to set system properties.
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neverallow { appdomain -system_app -radio -shell -bluetooth }
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property_type:property_service set;
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