ueventd.te

# ueventd seclabel is specified in init.rc since
# it lives in the rootfs and has no unique file type.
type ueventd, domain;
tmpfs_domain(ueventd)

# TODO: why is ueventd using __kmsg__ when it should just create
# and use /dev/kmsg instead?
type_transition ueventd device:chr_file klog_device "__kmsg__";
allow ueventd klog_device:chr_file { create open write unlink };

security_access_policy(ueventd)
allow ueventd init:process sigchld;
allow ueventd self:capability { chown mknod net_admin setgid fsetid sys_rawio dac_override fowner };
allow ueventd device:file create_file_perms;
allow ueventd device:chr_file rw_file_perms;
allow ueventd sysfs:file rw_file_perms;
allow ueventd sysfs_type:{ file lnk_file } { relabelfrom relabelto setattr getattr };
allow ueventd sysfs_type:dir { relabelfrom relabelto setattr r_dir_perms };
allow ueventd sysfs_devices_system_cpu:file rw_file_perms;
allow ueventd tmpfs:chr_file rw_file_perms;
allow ueventd dev_type:dir create_dir_perms;
allow ueventd dev_type:lnk_file { create unlink };
allow ueventd dev_type:chr_file { create setattr unlink };
allow ueventd dev_type:blk_file { create setattr unlink };
allow ueventd self:netlink_kobject_uevent_socket create_socket_perms;
allow ueventd efs_file:dir search;
allow ueventd efs_file:file r_file_perms;

# Use setfscreatecon() to label /dev directories and files.
allow ueventd self:process setfscreate;

#####
##### neverallow rules
#####

# ueventd must never set properties, otherwise deadlocks may occur.
# https://android-review.googlesource.com/#/c/133120/6/init/devices.cpp@941
# No writing to the property socket, connecting to init, or setting properties.
neverallow ueventd property_socket:sock_file write;
neverallow ueventd init:unix_stream_socket connectto;
neverallow ueventd property_type:property_service set;