# Any fsck program run by vold
type vold_fsck, domain;

# Inherit and use pty created by android_fork_execvp_ext().
allow vold_fsck devpts:chr_file { read write ioctl getattr };

# Run fsck on certain block devices
allow vold_fsck block_device:dir search;
allow vold_fsck vold_device:blk_file rw_file_perms;

# Allow stdin/out back to vold
allow vold_fsck vold:fd use;
allow vold_fsck vold:fifo_file { read write getattr };

###
### neverallow rules
###

# fsck should never be run on these block devices
neverallow vold_fsck {
  boot_block_device
  frp_block_device
  metadata_block_device
  recovery_block_device
  root_block_device
  swap_block_device
  system_block_device
  userdata_block_device
  cache_block_device
}:blk_file no_rw_file_perms;

# Only allow entry from vold via fsck binaries
neverallow { domain -vold } vold_fsck:process transition;
neverallow domain vold_fsck:process dyntransition;
neverallow vold_fsck { file_type fs_type -fsck_exec }:file entrypoint;