selinux-refpolicy/refpolicy/policy/modules/kernel/kernel.te

########################################
# kernel_t is the domain of kernel threads.
# It is also the target type when checking permissions in the system class.
# 
type kernel_t;
role system_r types kernel_t;

domain_make_base_domain(kernel_t)

terminal_use_console(kernel_t)
domain_signal_all_domains(kernel_t)

# Use capabilities. need to investigate which capabilities are actually used
#allow kernel_t self:capability *;

# Mount root file system.  Used when loading a policy
# from initrd, then mounting the root filesystem
filesystem_mount_all_filesystems(kernel_t)

# Other possible mount points for the root fs are in sysfiles
allow kernel_t unlabeled_t:dir mounton;

# /proc/sys/kernel/modprobe is set to /bin/true if not using modules.
#can_exec(kernel_t, bin_t.sys)

# Kernel-generated traffic, e.g. ICMP replies.
corenetwork_send_raw_on_all_interfaces(kernel_t)
corenetwork_receive_raw_on_all_interfaces(kernel_t)

# Kernel-generated traffic, e.g. TCP resets.
corenetwork_send_tcp_on_all_interfaces(kernel_t)
corenetwork_receive_tcp_on_all_interfaces(kernel_t)

########################################
#
# unlabeled_t is the type of unlabeled objects.
# Objects that have no known labeling information or that
# have labels that are no longer valid are treated as having this type.
#
type unlabeled_t;

############################################
# 
# security_t is the target type when checking
# the permissions in the security class.  It is also
# applied to selinuxfs inodes.
#
type security_t;
genfscon selinuxfs / system_u:object_r:security_t

attribute can_load_policy;
attribute can_setenforce;
attribute can_setsecparam;
neverallow ~can_load_policy security_t:security load_policy;
neverallow ~can_setenforce security_t:security setenforce;
neverallow ~can_setsecparam security_t:security setsecparam;

# enabling dyntransition breaks process tranquility.  If you dont
# know what this means or dont understand the implications of a
# dynamic transition, you shouldnt be using it!!!
neverallow * *:process { setcurrent dyntransition };

attribute can_load_kernmodule;
neverallow ~can_load_kernmodule *:capability sys_module;

########################################
#
# sysfs_t is the type for /sys
#
type sysfs_t;
filesystem_make_filesystem(sysfs_t)
genfscon sysfs / system_u:object_r:sysfs_t

########################################
#
# usbfs_t is the type for /proc/bus/usb
#
type usbfs_t alias usbdevfs_t;
filesystem_make_filesystem(usbfs_t)
genfscon usbfs / system_u:object_r:usbfs_t
genfscon usbdevfs / system_u:object_r:usbfs_t

############################################
#
# Procfs types
#

type proc_t;
genfscon proc / system_u:object_r:proc_t
genfscon proc /sysvipc system_u:object_r:proc_t

# kernel message interface
type proc_kmsg_t;
genfscon proc /kmsg system_u:object_r:proc_kmsg_t
attribute can_receive_kernel_messages;
neverallow ~can_receive_kernel_messages proc_kmsg_t:file ~getattr;

# /proc kcore: inaccessible
type proc_kcore_t;
neverallow * proc_kcore_t:file ~getattr;
genfscon proc /kcore system_u:object_r:proc_kcore_t

type proc_mdstat_t;
genfscon proc /mdstat system_u:object_r:proc_mdstat_t

type proc_net_t;
genfscon proc /net system_u:object_r:proc_net_t

############################################
#
# Sysctl types
#

# /proc/irq directory and files
type sysctl_irq_t;
genfscon proc /irq system_u:object_r:sysctl_irq_t

# /proc/net/rpc directory and files
type sysctl_rpc_t;
genfscon proc /net/rpc system_u:object_r:sysctl_rpc_t

# /proc/sys directory, base directory of sysctls
type sysctl_t;
genfscon proc /sys system_u:object_r:sysctl_t

# /proc/sys/fs directory and files
type sysctl_fs_t;
genfscon proc /sys/fs system_u:object_r:sysctl_fs_t

# /proc/sys/kernel directory and files
type sysctl_kernel_t;
genfscon proc /sys/kernel system_u:object_r:sysctl_kernel_t

# /proc/sys/kernel/modprobe file
type sysctl_modprobe_t;
genfscon proc /sys/kernel/modprobe system_u:object_r:sysctl_modprobe_t

# /proc/sys/kernel/hotplug file
type sysctl_hotplug_t;
genfscon proc /sys/kernel/hotplug system_u:object_r:sysctl_hotplug_t

# /proc/sys/net directory and files
type sysctl_net_t;
genfscon proc /sys/net system_u:object_r:sysctl_net_t

# /proc/sys/net/unix directory and files
type sysctl_net_unix_t;
genfscon proc /sys/net/unix system_u:object_r:sysctl_net_unix_t

# /proc/sys/vm directory and files
type sysctl_vm_t;
genfscon proc /sys/vm system_u:object_r:sysctl_vm_t

# /proc/sys/dev directory and files
type sysctl_dev_t;
genfscon proc /sys/dev system_u:object_r:sysctl_dev_t