blob: 3d204e1b07134b1d85351504e36bc6970de1cc74 [file] [log] [blame]
# volume manager
type vold, domain;
type vold_exec, exec_type, file_type, system_file_type;
# Read already opened /cache files.
allow vold cache_file:dir r_dir_perms;
allow vold cache_file:file { getattr read };
allow vold cache_file:lnk_file r_file_perms;
r_dir_file(vold, { sysfs_type -sysfs_batteryinfo })
# XXX Label sysfs files with a specific type?
allow vold {
sysfs # writing to /sys/*/uevent during coldboot.
sysfs_loop # writing to /sys/block/loop*/uevent during coldboot.
}:file w_file_perms;
r_dir_file(vold, rootfs)
r_dir_file(vold, metadata_file)
allow vold {
proc # b/67049235 processes /proc/<pid>/* files are mislabeled.
}:file r_file_perms;
#Get file contexts
allow vold file_contexts_file:file r_file_perms;
# Allow us to jump into execution domains of above tools
allow vold self:process setexec;
# For formatting adoptable storage devices
allow vold e2fs_exec:file rx_file_perms;
# Run fstrim on mounted partitions
# allowxperm still requires the ioctl permission for the individual type
allowxperm vold { fs_type file_type }:dir ioctl FITRIM;
# Get/set file-based encryption policies on dirs in /data and adoptable storage,
# and add/remove file-based encryption keys.
allowxperm vold data_file_type:dir ioctl {
# Only vold and init should ever set file-based encryption policies.
neverallowxperm {
} data_file_type:dir ioctl { FS_IOC_SET_ENCRYPTION_POLICY };
# Only vold should ever add/remove file-based encryption keys.
neverallowxperm {
# Allow securely erasing crypto key files. F2FS_IOC_SEC_TRIM_FILE is
# tried first. Otherwise, FS_IOC_FIEMAP is needed to get the
# location of the file's blocks on the raw block device to erase.
allowxperm vold {
}:file ioctl {
typeattribute vold mlstrustedsubject;
allow vold self:process setfscreate;
allow vold system_file:file x_file_perms;
not_full_treble(`allow vold vendor_file:file x_file_perms;')
allow vold block_device:dir create_dir_perms;
allow vold device:dir write;
allow vold devpts:chr_file rw_file_perms;
allow vold rootfs:dir mounton;
allow vold { sdcard_type fuse }:dir mounton; # TODO: deprecated in M
allow vold { sdcard_type fuse }:filesystem { mount remount unmount }; # TODO: deprecated in M
# Manage locations where storage is mounted
allow vold { mnt_media_rw_file storage_file sdcard_type fuse }:dir create_dir_perms;
allow vold { mnt_media_rw_file storage_file sdcard_type fuse }:file create_file_perms;
# Access to storage that backs emulated FUSE daemons for migration optimization
allow vold media_rw_data_file:dir create_dir_perms;
allow vold media_rw_data_file:file create_file_perms;
# Allow mounting (lower filesystem) on parts of media for performance
allow vold media_rw_data_file:dir mounton;
# Allow setting project quota IDs and enabling project ID inheritance on
# /data/media/$userId/* and /mnt/expand/$volume/media/$userId/*
allowxperm vold media_rw_data_file:{ dir file } ioctl {
# Allow mounting of storage devices
allow vold { mnt_media_rw_stub_file storage_stub_file }:dir { mounton create rmdir getattr setattr };
# Manage per-user primary symlinks
allow vold mnt_user_file:dir { create_dir_perms mounton };
allow vold mnt_user_file:lnk_file create_file_perms;
allow vold mnt_user_file:file create_file_perms;
# Manage per-user pass_through primary symlinks
allow vold mnt_pass_through_file:dir { create_dir_perms mounton };
allow vold mnt_pass_through_file:lnk_file create_file_perms;
# Allow to create and mount expanded storage
allow vold mnt_expand_file:dir { create_dir_perms mounton };
allow vold apk_data_file:dir { create getattr setattr };
allow vold shell_data_file:dir { create getattr setattr };
allow vold system_userdir_file:dir { create getattr setattr };
allow vold media_userdir_file:dir { create getattr setattr open read ioctl };
# Needed to set the casefold flag on /mnt/expand/$volume/media
allowxperm vold media_userdir_file:dir ioctl { FS_IOC_GETFLAGS FS_IOC_SETFLAGS };
# Allow to mount incremental file system on /data/incremental and create files
allow vold apk_data_file:dir { mounton rw_dir_perms };
# Allow to create and write files in /data/incremental
allow vold apk_data_file:file { rw_file_perms unlink };
# Allow to bind-mount incremental file system on /data/app/vmdl*.tmp and read files
allow vold apk_tmp_file:dir { mounton r_dir_perms };
# Allow to read incremental control file and call selinux restorecon on it
allow vold incremental_control_file:file { r_file_perms relabelto };
allow vold tmpfs:filesystem { mount unmount };
allow vold tmpfs:dir create_dir_perms;
allow vold tmpfs:dir mounton;
allow vold self:global_capability_class_set { net_admin dac_override dac_read_search mknod sys_admin chown fowner fsetid };
allow vold self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
allow vold loop_control_device:chr_file rw_file_perms;
allow vold loop_device:blk_file { create setattr unlink rw_file_perms };
allowxperm vold loop_device:blk_file ioctl {
allow vold vold_device:blk_file { create setattr unlink rw_file_perms };
allowxperm vold vold_device:blk_file ioctl { BLKDISCARD BLKGETSIZE };
allow vold dm_device:chr_file rw_file_perms;
allow vold dm_device:blk_file rw_file_perms;
allowxperm vold dm_device:blk_file ioctl { BLKDISCARD BLKSECDISCARD BLKREPORTZONE BLKRESETZONE };
# For vold Process::killProcessesWithOpenFiles function.
allow vold domain:dir r_dir_perms;
allow vold domain:{ file lnk_file } r_file_perms;
allow vold domain:process { signal sigkill };
allow vold self:global_capability_class_set { sys_ptrace kill };
allow vold kmsg_device:chr_file rw_file_perms;
# Run fsck in the fsck domain.
allow vold fsck_exec:file { r_file_perms execute };
# Log fsck results
allow vold fscklogs:dir rw_dir_perms;
allow vold fscklogs:file create_file_perms;
# Mount and unmount filesystems.
allow vold labeledfs:filesystem { mount unmount remount };
# Create and mount on /data/tmp_mnt and management of expansion mounts
allow vold {
}:dir { create rw_dir_perms mounton setattr rmdir };
allow vold system_data_file:lnk_file getattr;
# Vold create users in /data/vendor_{ce,de}/[0-9]+
allow vold vendor_data_file:dir create_dir_perms;
# for secdiscard
allow vold system_data_file:file read;
# Set scheduling policy of kernel processes
allow vold kernel:process setsched;
allow vold asec_image_file:file create_file_perms;
allow vold asec_image_file:dir rw_dir_perms;
allow vold asec_apk_file:dir { create_dir_perms mounton relabelfrom relabelto };
allow vold asec_public_file:dir { relabelto setattr };
allow vold asec_apk_file:file { r_file_perms setattr relabelfrom relabelto };
allow vold asec_public_file:file { relabelto setattr };
# restorecon files in asec containers created on 4.2 or earlier.
allow vold unlabeled:dir { r_dir_perms setattr relabelfrom };
allow vold unlabeled:file { r_file_perms setattr relabelfrom };
# Access to FUSE control filesystem to hard-abort FUSE mounts
allow vold fusectlfs:file rw_file_perms;
allow vold fusectlfs:dir rw_dir_perms;
# Allow vold to use wake locks. Needed for idle maintenance and moving storage.
# Allow vold to publish a binder service and make binder calls.
add_service(vold, vold_service)
# Allow vold to call into the system server so it can check permissions.
binder_call(vold, system_server)
allow vold permission_service:service_manager find;
# talk to health storage HAL
hal_client_domain(vold, hal_health_storage)
# talk to bootloader HAL
full_treble_only(`hal_client_domain(vold, hal_bootctl)')
# Access userdata block device.
allow vold userdata_block_device:blk_file rw_file_perms;
allowxperm vold userdata_block_device:blk_file ioctl BLKSECDISCARD;
# Access zoned block device.
allow vold zoned_block_device:blk_file rw_file_perms;
# Access metadata block device used for encryption meta-data.
allow vold metadata_block_device:blk_file rw_file_perms;
allowxperm vold metadata_block_device:blk_file ioctl BLKSECDISCARD;
# Allow vold to manipulate /data/unencrypted
allow vold unencrypted_data_file:{ file } create_file_perms;
allow vold unencrypted_data_file:dir create_dir_perms;
# Write to /proc/sys/vm/drop_caches
allow vold proc_drop_caches:file w_file_perms;
# Give vold a place where only vold can store files; everyone else is off limits
allow vold vold_data_file:dir create_dir_perms;
allow vold vold_data_file:file create_file_perms;
# And a similar place in the metadata partition
allow vold vold_metadata_file:dir create_dir_perms;
allow vold vold_metadata_file:file create_file_perms;
# linux keyring configuration
allow vold init:key { write search setattr };
allow vold vold:key { write search setattr };
# vold temporarily changes its priority when running benchmarks
allow vold self:global_capability_class_set sys_nice;
# vold needs to chroot into app namespaces to remount when runtime permissions change
allow vold self:global_capability_class_set sys_chroot;
allow vold storage_file:dir mounton;
# For AppFuse.
allow vold fuse_device:chr_file rw_file_perms;
allow vold fuse:filesystem { relabelfrom };
allow vold app_fusefs:filesystem { relabelfrom relabelto };
allow vold app_fusefs:filesystem { mount unmount };
allow vold app_fuse_file:dir rw_dir_perms;
allow vold app_fuse_file:file { read write open getattr append };
# MoveStorage.cpp executes cp and rm
allow vold toolbox_exec:file rx_file_perms;
# Prepare profile dir for users.
allow vold { user_profile_data_file user_profile_root_file }:dir create_dir_perms;
# Raw writes to misc block device
allow vold misc_block_device:blk_file w_file_perms;
# vold might need to search or mount /mnt/vendor/*
allow vold mnt_vendor_file:dir search;
dontaudit vold self:global_capability_class_set sys_resource;
# Allow ReadDefaultFstab().
# vold might need to search loopback apex files
allow vold vendor_apex_file:file r_file_perms;
neverallow {
} vold_data_file:dir ~{ open create read getattr setattr search relabelfrom relabelto ioctl };
neverallow {
} vold_data_file:dir *;
neverallow {
} vold_metadata_file:dir *;
neverallow {
} vold_data_file:notdevfile_class_set ~{ relabelto getattr };
neverallow {
} vold_metadata_file:notdevfile_class_set ~{ relabelto getattr };
neverallow {
} { vold_data_file vold_metadata_file }:notdevfile_class_set *;
neverallow { domain -vold -init } restorecon_prop:property_service set;
neverallow vold {
}:binder call;
neverallow vold fsck_exec:file execute_no_trans;
neverallow { domain -init } vold:process { transition dyntransition };
neverallow vold *:process ptrace;
neverallow vold *:rawip_socket *;