430 lines
14 KiB
Text
430 lines
14 KiB
Text
# init is its own domain.
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type init, domain, mlstrustedsubject;
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# The init domain is entered by execing init.
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type init_exec, exec_type, file_type;
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# /dev/__null__ node created by init.
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allow init tmpfs:chr_file { create setattr unlink rw_file_perms };
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#
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# init direct restorecon calls.
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#
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# /dev/kmsg
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allow init tmpfs:chr_file relabelfrom;
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allow init kmsg_device:chr_file { write relabelto };
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# /dev/__properties__
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allow init properties_device:dir relabelto;
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allow init properties_serial:file { write relabelto };
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allow init property_type:file { create_file_perms relabelto };
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# /dev/event-log-tags
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allow init device:file relabelfrom;
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allow init runtime_event_log_tags_file:file { open write setattr relabelto };
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# /dev/socket
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allow init { device socket_device }:dir relabelto;
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# /dev/random, /dev/urandom
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allow init random_device:chr_file relabelto;
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# /dev/device-mapper, /dev/block(/.*)?
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allow init tmpfs:{ chr_file blk_file } relabelfrom;
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allow init tmpfs:blk_file getattr;
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allow init block_device:{ dir blk_file lnk_file } relabelto;
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allow init dm_device:{ chr_file blk_file } relabelto;
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allow init kernel:fd use;
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# restorecon for early mount device symlinks
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allow init tmpfs:lnk_file { getattr read relabelfrom };
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allow init system_block_device:{ blk_file lnk_file } relabelto;
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# setrlimit
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allow init self:capability sys_resource;
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# Remove /dev/.booting, created before initial policy load or restorecon /dev.
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allow init tmpfs:file unlink;
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# Access pty created for fsck.
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allow init devpts:chr_file { read write open };
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# Create /dev/fscklogs files.
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allow init fscklogs:file create_file_perms;
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# Access /dev/__null__ node created prior to initial policy load.
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allow init tmpfs:chr_file write;
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# Access /dev/console.
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allow init console_device:chr_file rw_file_perms;
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# Access /dev/tty0.
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allow init tty_device:chr_file rw_file_perms;
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# Call mount(2).
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allow init self:capability sys_admin;
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# Create and mount on directories in /.
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allow init rootfs:dir create_dir_perms;
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allow init { rootfs cache_file cgroup storage_file system_data_file system_file vendor_file postinstall_mnt_dir }:dir mounton;
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# Mount on /dev/usb-ffs/adb.
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allow init device:dir mounton;
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# Create and remove symlinks in /.
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allow init rootfs:lnk_file { create unlink };
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# Mount debugfs on /sys/kernel/debug.
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allow init sysfs:dir mounton;
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# Create cgroups mount points in tmpfs and mount cgroups on them.
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allow init tmpfs:dir create_dir_perms;
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allow init tmpfs:dir mounton;
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allow init cgroup:dir create_dir_perms;
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r_dir_file(init, cgroup)
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allow init cpuctl_device:dir { create mounton };
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# /config
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allow init configfs:dir mounton;
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allow init configfs:dir create_dir_perms;
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allow init configfs:{ file lnk_file } create_file_perms;
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# Use tmpfs as /data, used for booting when /data is encrypted
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allow init tmpfs:dir relabelfrom;
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# Create directories under /dev/cpuctl after chowning it to system.
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allow init self:capability dac_override;
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# Set system clock.
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allow init self:capability sys_time;
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allow init self:capability { sys_rawio mknod };
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# Mounting filesystems from block devices.
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allow init dev_type:blk_file r_file_perms;
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# Mounting filesystems.
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# Only allow relabelto for types used in context= mount options,
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# which should all be assigned the contextmount_type attribute.
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# This can be done in device-specific policy via type or typeattribute
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# declarations.
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allow init fs_type:filesystem ~relabelto;
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allow init unlabeled:filesystem ~relabelto;
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allow init contextmount_type:filesystem relabelto;
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# Allow read-only access to context= mounted filesystems.
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allow init contextmount_type:dir r_dir_perms;
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allow init contextmount_type:notdevfile_class_set r_file_perms;
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# restorecon /adb_keys or any other rootfs files and directories to a more
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# specific type.
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allow init rootfs:{ dir file } relabelfrom;
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# mkdir, symlink, write, rm/rmdir, chown/chmod, restorecon/restorecon_recursive from init.rc files.
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# chown/chmod require open+read+setattr required for open()+fchown/fchmod().
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# system/core/init.rc requires at least cache_file and data_file_type.
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# init.<board>.rc files often include device-specific types, so
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# we just allow all file types except /system files here.
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allow init self:capability { chown fowner fsetid };
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allow init {
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file_type
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-app_data_file
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-exec_type
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-misc_logd_file
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-system_app_data_file
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-system_file
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-vendor_file_type
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}:dir { create search getattr open read setattr ioctl };
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allow init {
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file_type
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-app_data_file
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-exec_type
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-keystore_data_file
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-misc_logd_file
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-shell_data_file
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-system_app_data_file
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-system_file
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-vendor_file_type
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-vold_data_file
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}:dir { write add_name remove_name rmdir relabelfrom };
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allow init {
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file_type
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-app_data_file
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-runtime_event_log_tags_file
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-exec_type
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-keystore_data_file
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-misc_logd_file
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-shell_data_file
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-system_app_data_file
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-system_file
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-vendor_file_type
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-vold_data_file
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}:file { create getattr open read write setattr relabelfrom unlink };
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allow init {
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file_type
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-app_data_file
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-exec_type
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-keystore_data_file
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-misc_logd_file
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-shell_data_file
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-system_app_data_file
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-system_file
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-vendor_file_type
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-vold_data_file
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}:{ sock_file fifo_file } { create getattr open read setattr relabelfrom unlink };
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allow init {
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file_type
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-app_data_file
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-exec_type
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-keystore_data_file
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-misc_logd_file
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-shell_data_file
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-system_app_data_file
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-system_file
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-vendor_file_type
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-vold_data_file
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}:lnk_file { create getattr setattr relabelfrom unlink };
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allow init cache_file:lnk_file r_file_perms;
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allow init { file_type -system_file -vendor_file_type -exec_type }:dir_file_class_set relabelto;
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allow init { sysfs debugfs debugfs_tracing }:{ dir file lnk_file } { getattr relabelfrom };
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allow init { sysfs_type debugfs_type }:{ dir file lnk_file } { relabelto getattr };
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allow init dev_type:dir create_dir_perms;
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allow init dev_type:lnk_file create;
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# Disable tracing by writing to /sys/kernel/debug/tracing/tracing_on
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allow init tracing_shell_writable:file w_file_perms;
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# Setup and control wifi event tracing (see wifi-events.rc)
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allow init debugfs_tracing_instances:dir create_dir_perms;
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allow init debugfs_tracing_instances:file w_file_perms;
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allow init debugfs_wifi_tracing:file w_file_perms;
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# chown/chmod on pseudo files.
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allow init { fs_type -contextmount_type -sdcard_type -rootfs }:file { open read setattr };
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allow init { fs_type -contextmount_type -sdcard_type -rootfs }:dir { open read setattr search };
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# init should not be able to read or open generic devices
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# TODO: auditing to see if this can be deleted entirely
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allow init {
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dev_type
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-kmem_device
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-port_device
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-device
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-vndbinder_device
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}:chr_file { read open };
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auditallow init {
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dev_type
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-alarm_device
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-ashmem_device
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-binder_device
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-console_device
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-device
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-devpts
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-dm_device
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-hwbinder_device
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-hw_random_device
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-keychord_device
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-kmem_device
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-kmsg_device
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-null_device
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-owntty_device
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-port_device
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-ptmx_device
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-random_device
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-zero_device
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}:chr_file { read open };
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# chown/chmod on devices.
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allow init { dev_type -kmem_device -port_device }:chr_file setattr;
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# Unlabeled file access for upgrades from 4.2.
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allow init unlabeled:dir { create_dir_perms relabelfrom };
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allow init unlabeled:notdevfile_class_set { create_file_perms relabelfrom };
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# Any operation that can modify the kernel ring buffer, e.g. clear
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# or a read that consumes the messages that were read.
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allow init kernel:system syslog_mod;
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allow init self:capability2 syslog;
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# Set usermodehelpers and /proc security settings.
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allow init usermodehelper:file rw_file_perms;
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allow init proc_security:file rw_file_perms;
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# Write to /proc/sys/kernel/panic_on_oops.
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r_dir_file(init, proc)
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allow init proc:file w_file_perms;
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# Write to /proc/sys/net/ping_group_range and other /proc/sys/net files.
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r_dir_file(init, proc_net)
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allow init proc_net:file w_file_perms;
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allow init self:capability net_admin;
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# Write to /proc/sysrq-trigger.
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allow init proc_sysrq:file w_file_perms;
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# Read /proc/stat for bootchart.
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allow init proc_stat:file r_file_perms;
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# Reboot.
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allow init self:capability sys_boot;
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# Write to sysfs nodes.
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allow init sysfs_type:dir r_dir_perms;
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allow init sysfs_type:lnk_file read;
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allow init sysfs_type:file rw_file_perms;
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# Init will create /data/misc/logd when the property persist.logd.logpersistd is "logcatd".
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# Init will also walk through the directory as part of a recursive restorecon.
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allow init misc_logd_file:dir { add_name open create read getattr setattr search write };
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allow init misc_logd_file:file { open create getattr setattr write };
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# Support "adb shell stop"
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allow init self:capability kill;
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allow init domain:process { sigkill signal };
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# Init creates keystore's directory on boot, and walks through
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# the directory as part of a recursive restorecon.
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allow init keystore_data_file:dir { open create read getattr setattr search };
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allow init keystore_data_file:file { getattr };
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# Init creates vold's directory on boot, and walks through
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# the directory as part of a recursive restorecon.
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allow init vold_data_file:dir { open create read getattr setattr search };
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allow init vold_data_file:file { getattr };
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# Init creates /data/local/tmp at boot
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allow init shell_data_file:dir { open create read getattr setattr search };
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allow init shell_data_file:file { getattr };
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# Set UID, GID, and adjust capability bounding set for services.
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allow init self:capability { setuid setgid setpcap };
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# For bootchart to read the /proc/$pid/cmdline file of each process,
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# we need to have following line to allow init to have access
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# to different domains.
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r_dir_file(init, domain)
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# Use setexeccon(), setfscreatecon(), and setsockcreatecon().
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# setexec is for services with seclabel options.
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# setfscreate is for labeling directories and socket files.
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# setsockcreate is for labeling local/unix domain sockets.
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allow init self:process { setexec setfscreate setsockcreate };
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# Get file context
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allow init file_contexts_file:file r_file_perms;
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# sepolicy access
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allow init sepolicy_file:file r_file_perms;
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# Perform SELinux access checks on setting properties.
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selinux_check_access(init)
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# Ask the kernel for the new context on services to label their sockets.
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allow init kernel:security compute_create;
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# Create sockets for the services.
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allow init domain:unix_stream_socket { create bind setopt };
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allow init domain:unix_dgram_socket { create bind setopt };
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# Create /data/property and files within it.
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allow init property_data_file:dir create_dir_perms;
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allow init property_data_file:file create_file_perms;
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# Set any property.
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allow init property_type:property_service set;
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# Send an SELinux userspace denial to the kernel audit subsystem,
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# so it can be picked up and processed by logd. These denials are
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# generated when an attempt to set a property is denied by policy.
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allow init self:netlink_audit_socket { create_socket_perms_no_ioctl nlmsg_relay };
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allow init self:capability audit_write;
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# Run "ifup lo" to bring up the localhost interface
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allow init self:udp_socket { create ioctl };
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# in addition to unpriv ioctls granted to all domains, init also needs:
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allowxperm init self:udp_socket ioctl SIOCSIFFLAGS;
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allow init self:capability net_raw;
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# This line seems suspect, as it should not really need to
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# set scheduling parameters for a kernel domain task.
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allow init kernel:process setsched;
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# swapon() needs write access to swap device
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# system/core/fs_mgr/fs_mgr.c - fs_mgr_swapon_all
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allow init swap_block_device:blk_file rw_file_perms;
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# Read from /dev/hw_random if present.
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# system/core/init/init.c - mix_hwrng_into_linux_rng_action
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allow init hw_random_device:chr_file r_file_perms;
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# Create and access /dev files without a specific type,
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# e.g. /dev/.coldboot_done, /dev/.booting
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# TODO: Move these files into their own type unless they are
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# only ever accessed by init.
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allow init device:file create_file_perms;
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# keychord configuration
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allow init self:capability sys_tty_config;
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allow init keychord_device:chr_file rw_file_perms;
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# Access device mapper for setting up dm-verity
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allow init dm_device:chr_file rw_file_perms;
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allow init dm_device:blk_file rw_file_perms;
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# Access metadata block device for storing dm-verity state
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allow init metadata_block_device:blk_file rw_file_perms;
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# Read /sys/fs/pstore/console-ramoops to detect restarts caused
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# by dm-verity detecting corrupted blocks
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allow init pstorefs:dir search;
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allow init pstorefs:file r_file_perms;
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allow init kernel:system syslog_read;
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# linux keyring configuration
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allow init init:key { write search setattr };
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# Allow init to create /data/unencrypted
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allow init unencrypted_data_file:dir create_dir_perms;
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# Allow init to write to /proc/sys/vm/overcommit_memory
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allow init proc_overcommit_memory:file { write };
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unix_socket_connect(init, vold, vold)
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# Raw writes to misc block device
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allow init misc_block_device:blk_file w_file_perms;
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r_dir_file(init, system_file)
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r_dir_file(init, vendor_file_type)
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allow init proc_meminfo:file r_file_perms;
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allow init system_data_file:file { getattr read };
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allow init system_data_file:lnk_file r_file_perms;
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# For init to be able to run shell scripts from vendor
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allow init vendor_shell_exec:file execute;
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###
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### neverallow rules
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###
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# The init domain is only entered via an exec based transition from the
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# kernel domain, never via setcon().
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neverallow domain init:process dyntransition;
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neverallow { domain -kernel } init:process transition;
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neverallow init { file_type fs_type -init_exec }:file entrypoint;
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# Never read/follow symlinks created by shell or untrusted apps.
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neverallow init shell_data_file:lnk_file read;
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neverallow init app_data_file:lnk_file read;
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# init should never execute a program without changing to another domain.
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neverallow init { file_type fs_type }:file execute_no_trans;
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# Init never adds or uses services via service_manager.
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neverallow init service_manager_type:service_manager { add find };
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neverallow init servicemanager:service_manager list;
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# Init should not be creating subdirectories in /data/local/tmp
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neverallow init shell_data_file:dir { write add_name remove_name };
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