selinux-policy/refpolicy/policy/modules/system/clock.if

## <module name="clock" layer="system">
## <summary>Policy for reading and setting the hardware clock.</summary>

########################################
## <interface name="clock_transition">
##	<description>
##		Execute hwclock in the clock domain.
##	</description>
##	<parameter name="domain">
##		The type of the process performing this action.
##	</parameter>
##	<infoflow type="write" weight="10"/>
## </interface>
#
define(`clock_transition',`
	requires_block_template(`$0'_depend)

	domain_auto_trans($1,hwclock_exec_t,hwclock_t)

	allow $1 hwclock_t:fd use;
	allow hwclock_t $1:fd use;
	allow hwclock_t $1:fifo_file rw_file_perms;
	allow hwclock_t $1:process sigchld;
')

define(`clock_transition_depend',`
	type hwclock_t, hwclock_exec_t;

	class file rx_file_perms;
	class process { transition noatsecure siginh rlimitinh sigchld };
	class fd use;
	class fifo_file rw_file_perms;
')

########################################
## <interface name="clock_transition_add_role_use_terminal">
##	<description>
##		Execute hwclock in the clock domain, and
##		allow the specified role the hwclock domain.
##	</description>
##	<parameter name="domain">
##		The type of the process performing this action.
##	</parameter>
##	<parameter name="role">
##		The role to be allowed the clock domain.
##	</parameter>
##	<parameter name="terminal">
##		The type of the terminal allow the clock domain to use.
##	</parameter>
##	<infoflow type="write" weight="10"/>
## </interface>
#
define(`clock_transition_add_role_use_terminal',`
	requires_block_template(`$0'_depend)

	clock_transition($1)
	role $2 types hwclock_t;
	allow hwclock_t $3:chr_file { getattr read write ioctl };
')

define(`clock_transition_add_role_use_terminal_depend',`
	type hwclock_t;

	class chr_file { getattr read write ioctl };
')

########################################
## <interface name="clock_execute">
##     <description>
##             Execute hwclock
##     </description>
##     <parameter name="domain">
##             The type of the process performing this action.
##     </parameter>
##     <infoflow type="execute" weight="10"/>
## </interface>
#
define(`clock_execute',`
	requires_block_template(`$0'_depend)

	can_exec($1,hwclock_exec_t)
')

define(`clock_execute_depend',`
	type hwclock_exec_t;

	class file { getattr read execute execute_no_trans };
')

########################################
## <interface name="clock_modify_drift_records">
##     <description>
##             Allow executing domain to modify clock drift
##     </description>
##     <parameter name="domain">
##             The type of the process performing this action.
##     </parameter>
##     <infoflow type="write" weight="10"/>
## </interface>
#
define(`clock_modify_drift_records',`
	requires_block_template(`$0'_depend)

	allow $1 adjtime_t:file rw_file_perms;
	files_read_general_system_config_directory($1)
')

define(`clock_modify_drift_records_depend',`
	type adjtime_t;

	class file rw_file_perms;
')

## </module>