# volume manager
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type vold, domain;
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type vold_exec, exec_type, file_type, system_file_type;
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# Read already opened /cache files.
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allow vold cache_file:dir r_dir_perms;
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allow vold cache_file:file { getattr read };
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allow vold cache_file:lnk_file r_file_perms;
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r_dir_file(vold, { sysfs_type -sysfs_batteryinfo })
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# XXX Label sysfs files with a specific type?
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allow vold {
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sysfs # writing to /sys/*/uevent during coldboot.
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sysfs_devices_block
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sysfs_dm
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sysfs_loop # writing to /sys/block/loop*/uevent during coldboot.
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sysfs_usb
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sysfs_zram_uevent
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sysfs_fs_f2fs
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}:file w_file_perms;
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r_dir_file(vold, rootfs)
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r_dir_file(vold, metadata_file)
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allow vold {
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proc # b/67049235 processes /proc/<pid>/* files are mislabeled.
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proc_cmdline
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proc_drop_caches
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proc_filesystems
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proc_meminfo
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proc_mounts
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}:file r_file_perms;
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#Get file contexts
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allow vold file_contexts_file:file r_file_perms;
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# Allow us to jump into execution domains of above tools
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allow vold self:process setexec;
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# For formatting adoptable storage devices
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allow vold e2fs_exec:file rx_file_perms;
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# Run fstrim on mounted partitions
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# allowxperm still requires the ioctl permission for the individual type
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allowxperm vold { fs_type file_type }:dir ioctl FITRIM;
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# Get encryption policy for dirs in /data
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allowxperm vold data_file_type:dir ioctl {
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FS_IOC_GET_ENCRYPTION_POLICY
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FS_IOC_SET_ENCRYPTION_POLICY
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};
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# Find the location on the raw block device where the
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# crypto key is stored so it can be destroyed
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allowxperm vold vold_data_file:file ioctl {
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FS_IOC_FIEMAP
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};
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typeattribute vold mlstrustedsubject;
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allow vold self:process setfscreate;
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allow vold system_file:file x_file_perms;
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not_full_treble(`allow vold vendor_file:file x_file_perms;')
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allow vold block_device:dir create_dir_perms;
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allow vold device:dir write;
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allow vold devpts:chr_file rw_file_perms;
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allow vold rootfs:dir mounton;
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allow vold sdcard_type:dir mounton; # TODO: deprecated in M
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allow vold sdcard_type:filesystem { mount remount unmount }; # TODO: deprecated in M
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allow vold sdcard_type:dir create_dir_perms; # TODO: deprecated in M
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allow vold sdcard_type:file create_file_perms; # TODO: deprecated in M
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# Manage locations where storage is mounted
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allow vold { mnt_media_rw_file storage_file sdcard_type }:dir create_dir_perms;
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allow vold { mnt_media_rw_file storage_file sdcard_type }:file create_file_perms;
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# Access to storage that backs emulated FUSE daemons for migration optimization
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allow vold media_rw_data_file:dir create_dir_perms;
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allow vold media_rw_data_file:file create_file_perms;
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# Allow mounting of storage devices
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allow vold { mnt_media_rw_stub_file storage_stub_file }:dir { mounton create rmdir getattr setattr };
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# Manage per-user primary symlinks
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allow vold mnt_user_file:dir { create_dir_perms mounton };
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allow vold mnt_user_file:lnk_file create_file_perms;
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allow vold mnt_user_file:file create_file_perms;
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# Allow to create and mount expanded storage
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allow vold mnt_expand_file:dir { create_dir_perms mounton };
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allow vold apk_data_file:dir { create getattr setattr };
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allow vold shell_data_file:dir { create getattr setattr };
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allow vold tmpfs:filesystem { mount unmount };
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allow vold tmpfs:dir create_dir_perms;
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allow vold tmpfs:dir mounton;
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allow vold self:global_capability_class_set { net_admin dac_override dac_read_search mknod sys_admin chown fowner fsetid };
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allow vold self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
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allow vold loop_control_device:chr_file rw_file_perms;
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allow vold loop_device:blk_file { create setattr unlink rw_file_perms };
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allowxperm vold loop_device:blk_file ioctl {
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LOOP_CLR_FD
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LOOP_CTL_GET_FREE
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LOOP_GET_STATUS64
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LOOP_SET_FD
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LOOP_SET_STATUS64
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};
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allow vold vold_device:blk_file { create setattr unlink rw_file_perms };
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allowxperm vold vold_device:blk_file ioctl { BLKDISCARD BLKGETSIZE };
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allow vold dm_device:chr_file rw_file_perms;
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allow vold dm_device:blk_file rw_file_perms;
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allowxperm vold dm_device:blk_file ioctl BLKSECDISCARD;
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# For vold Process::killProcessesWithOpenFiles function.
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allow vold domain:dir r_dir_perms;
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allow vold domain:{ file lnk_file } r_file_perms;
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allow vold domain:process { signal sigkill };
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allow vold self:global_capability_class_set { sys_ptrace kill };
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allow vold kmsg_device:chr_file rw_file_perms;
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# Run fsck in the fsck domain.
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allow vold fsck_exec:file { r_file_perms execute };
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# Log fsck results
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allow vold fscklogs:dir rw_dir_perms;
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allow vold fscklogs:file create_file_perms;
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#
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# Rules to support encrypted fs support.
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#
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# Unmount and mount the fs.
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allow vold labeledfs:filesystem { mount unmount remount };
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# Access /efs/userdata_footer.
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# XXX Split into a separate type?
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allow vold efs_file:file rw_file_perms;
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# Create and mount on /data/tmp_mnt and management of expansion mounts
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allow vold system_data_file:dir { create rw_dir_perms mounton setattr rmdir };
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allow vold system_data_file:lnk_file getattr;
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# Vold create users in /data/vendor_{ce,de}/[0-9]+
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allow vold vendor_data_file:dir create_dir_perms;
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# for secdiscard
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allow vold system_data_file:file read;
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# Set scheduling policy of kernel processes
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allow vold kernel:process setsched;
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# Property Service
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set_prop(vold, vold_prop)
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set_prop(vold, exported_vold_prop)
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set_prop(vold, exported2_vold_prop)
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set_prop(vold, powerctl_prop)
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set_prop(vold, ctl_fuse_prop)
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set_prop(vold, restorecon_prop)
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# ASEC
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allow vold asec_image_file:file create_file_perms;
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allow vold asec_image_file:dir rw_dir_perms;
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allow vold asec_apk_file:dir { create_dir_perms mounton relabelfrom relabelto };
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allow vold asec_public_file:dir { relabelto setattr };
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allow vold asec_apk_file:file { r_file_perms setattr relabelfrom relabelto };
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allow vold asec_public_file:file { relabelto setattr };
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# restorecon files in asec containers created on 4.2 or earlier.
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allow vold unlabeled:dir { r_dir_perms setattr relabelfrom };
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allow vold unlabeled:file { r_file_perms setattr relabelfrom };
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# Handle wake locks (used for device encryption)
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wakelock_use(vold)
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# Allow vold to publish a binder service and make binder calls.
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binder_use(vold)
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add_service(vold, vold_service)
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# Allow vold to call into the system server so it can check permissions.
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binder_call(vold, system_server)
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allow vold permission_service:service_manager find;
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# talk to batteryservice
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binder_call(vold, healthd)
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# talk to keymaster
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hal_client_domain(vold, hal_keymaster)
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# talk to health storage HAL
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hal_client_domain(vold, hal_health_storage)
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# talk to bootloader HAL
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full_treble_only(`hal_client_domain(vold, hal_bootctl)')
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# Access userdata block device.
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allow vold userdata_block_device:blk_file rw_file_perms;
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allowxperm vold userdata_block_device:blk_file ioctl BLKSECDISCARD;
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# Access metadata block device used for encryption meta-data.
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allow vold metadata_block_device:blk_file rw_file_perms;
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# Allow vold to manipulate /data/unencrypted
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allow vold unencrypted_data_file:{ file } create_file_perms;
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allow vold unencrypted_data_file:dir create_dir_perms;
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# Write to /proc/sys/vm/drop_caches
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allow vold proc_drop_caches:file w_file_perms;
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# Give vold a place where only vold can store files; everyone else is off limits
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allow vold vold_data_file:dir create_dir_perms;
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allow vold vold_data_file:file create_file_perms;
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# And a similar place in the metadata partition
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allow vold vold_metadata_file:dir create_dir_perms;
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allow vold vold_metadata_file:file create_file_perms;
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# linux keyring configuration
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allow vold init:key { write search setattr };
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allow vold vold:key { write search setattr };
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# vold temporarily changes its priority when running benchmarks
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allow vold self:global_capability_class_set sys_nice;
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# vold needs to chroot into app namespaces to remount when runtime permissions change
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allow vold self:global_capability_class_set sys_chroot;
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allow vold storage_file:dir mounton;
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# For AppFuse.
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allow vold fuse_device:chr_file rw_file_perms;
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allow vold fuse:filesystem { relabelfrom };
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allow vold app_fusefs:filesystem { relabelfrom relabelto };
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allow vold app_fusefs:filesystem { mount unmount };
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allow vold app_fuse_file:dir rw_dir_perms;
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allow vold app_fuse_file:file { read write open getattr append };
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# MoveTask.cpp executes cp and rm
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allow vold toolbox_exec:file rx_file_perms;
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# Prepare profile dir for users.
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allow vold user_profile_data_file:dir create_dir_perms;
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# Raw writes to misc block device
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allow vold misc_block_device:blk_file w_file_perms;
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# vold might need to search or mount /mnt/vendor/*
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allow vold mnt_vendor_file:dir search;
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dontaudit vold self:global_capability_class_set sys_resource;
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# vold needs to know whether we're running a GSI.
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allow vold gsi_metadata_file:dir r_dir_perms;
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allow vold gsi_metadata_file:file r_file_perms;
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neverallow {
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domain
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-vold
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-vold_prepare_subdirs
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} vold_data_file:dir ~{ open create read getattr setattr search relabelfrom relabelto ioctl };
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neverallow {
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domain
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-init
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-vold
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-vold_prepare_subdirs
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} vold_data_file:dir *;
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neverallow {
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domain
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-init
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-vold
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} vold_metadata_file:dir *;
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neverallow {
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domain
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-kernel
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-vold
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-vold_prepare_subdirs
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} vold_data_file:notdevfile_class_set ~{ relabelto getattr };
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neverallow {
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domain
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-init
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-vold
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-vold_prepare_subdirs
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} vold_metadata_file:notdevfile_class_set ~{ relabelto getattr };
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neverallow {
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domain
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-init
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-kernel
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-vold
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-vold_prepare_subdirs
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} { vold_data_file vold_metadata_file }:notdevfile_class_set *;
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neverallow { domain -vold -init } restorecon_prop:property_service set;
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neverallow {
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domain
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-system_server
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-vdc
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-vold
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-update_verifier
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-apexd
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} vold_service:service_manager find;
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neverallow vold {
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domain
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-ashmemd
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-hal_health_storage_server
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-hal_keymaster_server
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-system_suspend_server
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-hal_bootctl_server
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-healthd
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-hwservicemanager
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-iorapd_service
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-servicemanager
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-system_server
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userdebug_or_eng(`-su')
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}:binder call;
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neverallow vold fsck_exec:file execute_no_trans;
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neverallow { domain -init } vold:process { transition dyntransition };
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neverallow vold *:process ptrace;
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neverallow vold *:rawip_socket *;
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