7e86e19d58
vold hasn't use the generic "block_device" label since
commit 273d7ea4ca (Sept 2014), and
the auditallow statement in vold hasn't triggered since that time.
Remove the rule which allows vold access to the generic block_device
label, and remove the vold exception.
Thanks to jorgelo for reminding me about this.
Change-Id: Idd6cdc20f5be9a40c5c8f6d43bbf902a475ba1c9
171 lines
6.4 KiB
Text
171 lines
6.4 KiB
Text
# volume manager
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type vold, domain;
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type vold_exec, exec_type, file_type;
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init_daemon_domain(vold)
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# Switch to more restrictive domains when executing common tools
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domain_auto_trans(vold, sgdisk_exec, sgdisk);
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domain_auto_trans(vold, sdcardd_exec, sdcardd);
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# For a handful of probing tools, we choose an even more restrictive
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# domain when working with untrusted block devices
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domain_trans(vold, shell_exec, blkid);
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domain_trans(vold, shell_exec, blkid_untrusted);
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domain_trans(vold, fsck_exec, fsck);
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domain_trans(vold, fsck_exec, fsck_untrusted);
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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 sgdisk launched through popen()
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allow vold shell_exec:file rx_file_perms;
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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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# XXX Run toolbox. Might not be needed.
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allow vold toolbox_exec:file rx_file_perms;
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auditallow vold toolbox_exec:file rx_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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# Newly created storage dirs are always treated as mount stubs to prevent us
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# from accidentally writing when the mount point isn't present.
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type_transition vold storage_file:dir storage_stub_file;
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type_transition vold mnt_media_rw_file:dir mnt_media_rw_stub_file;
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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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allow vold sdcard_type:filesystem { mount unmount remount };
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# Manage per-user primary symlinks
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allow vold mnt_user_file:dir create_dir_perms;
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allow vold mnt_user_file:lnk_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:capability { net_admin dac_override mknod sys_admin chown fowner fsetid };
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allow vold self:netlink_kobject_uevent_socket create_socket_perms;
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allow vold app_data_file:dir search;
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allow vold app_data_file:file rw_file_perms;
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allow vold loop_device:blk_file create_file_perms;
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allow vold vold_device:blk_file create_file_perms;
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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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# 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:capability { sys_ptrace kill };
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# XXX Label sysfs files with a specific type?
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allow vold sysfs:file rw_file_perms;
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allow vold kmsg_device:chr_file rw_file_perms;
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# Run fsck.
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allow vold fsck_exec:file rx_file_perms;
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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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# 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, 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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security_access_policy(vold)
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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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# talk to batteryservice
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binder_use(vold)
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binder_call(vold, healthd)
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# talk to keymaster
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allow vold tee_device:chr_file rw_file_perms;
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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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# 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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# 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:capability 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:capability sys_chroot;
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allow vold storage_file:dir mounton;
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neverallow { domain -vold } vold_data_file:dir ~{ open create read getattr setattr search relabelto ioctl };
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neverallow { domain -vold } vold_data_file:notdevfile_class_set ~{ relabelto getattr };
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neverallow { domain -vold -init } vold_data_file:dir *;
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neverallow { domain -vold -init } vold_data_file:notdevfile_class_set *;
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neverallow { domain -vold -init } restorecon_prop:property_service set;
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