The attach patch adds policy for memlockd, this is a daemon that locks
important programs and config files into RAM so that if the system is paging
heavily the sysadmin still has a good chance of being able to login to
diagnose problems.
--
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Index: refpolicy-2.20200209/policy/modules/services/memlockd.fc
===================================================================
--- /dev/null
+++ refpolicy-2.20200209/policy/modules/services/memlockd.fc
@@ -0,0 +1 @@
+/usr/sbin/memlockd -- gen_context(system_u:object_r:memlockd_exec_t,s0)
Index: refpolicy-2.20200209/policy/modules/services/memlockd.if
===================================================================
--- /dev/null
+++ refpolicy-2.20200209/policy/modules/services/memlockd.if
@@ -0,0 +1,2 @@
+## <summary>memory lock daemon, keeps important files in RAM.</summary>
+
Index: refpolicy-2.20200209/policy/modules/services/memlockd.te
===================================================================
--- /dev/null
+++ refpolicy-2.20200209/policy/modules/services/memlockd.te
@@ -0,0 +1,42 @@
+policy_module(memlockd, 1.0.0)
+
+########################################
+#
+# Declarations
+#
+
+type memlockd_t;
+type memlockd_exec_t;
+init_daemon_domain(memlockd_t, memlockd_exec_t)
+
+########################################
+#
+# Local policy
+#
+
+allow memlockd_t self:capability { setgid setuid ipc_lock };
+allow memlockd_t self:fifo_file rw_file_perms;
+allow memlockd_t self:unix_dgram_socket { create connect };
+
+# cache /etc/shadow too
+auth_read_shadow(memlockd_t)
+auth_map_shadow(memlockd_t)
+
+sysnet_map_config(memlockd_t)
+files_read_etc_files(memlockd_t)
+
+# for ldd
+corecmd_exec_bin(memlockd_t)
+corecmd_exec_shell(memlockd_t)
+libs_exec_ld_so(memlockd_t)
+
+corecmd_search_bin(memlockd_t)
+files_map_etc_files(memlockd_t)
+# has to exec for ldd
+corecmd_exec_all_executables(memlockd_t)
+corecmd_read_all_executables(memlockd_t)
+
+logging_send_syslog_msg(memlockd_t)
+
+miscfiles_read_localization(memlockd_t)
+
Index: refpolicy-2.20200209/policy/modules/system/sysnetwork.if
===================================================================
--- refpolicy-2.20200209.orig/policy/modules/system/sysnetwork.if
+++ refpolicy-2.20200209/policy/modules/system/sysnetwork.if
@@ -366,6 +366,31 @@ interface(`sysnet_read_config',`
#######################################
## <summary>
+## map network config files.
+## </summary>
+## <desc>
+## <p>
+## Allow the specified domain to mmap the
+## general network configuration files.
+## </p>
+## </desc>
+## <param name="domain">
+## <summary>
+## Domain allowed access.
+## </summary>
+## </param>
+#
+interface(`sysnet_map_config',`
+ gen_require(`
+ type net_conf_t;
+ ')
+
+ files_search_etc($1)
+ allow $1 net_conf_t:file { read_file_perms map };
+')
+
+#######################################
+## <summary>
## Do not audit attempts to read network config files.
## </summary>
## <param name="domain">
Index: refpolicy-2.20200209/policy/modules/system/authlogin.if
===================================================================
--- refpolicy-2.20200209.orig/policy/modules/system/authlogin.if
+++ refpolicy-2.20200209/policy/modules/system/authlogin.if
@@ -577,6 +577,23 @@ interface(`auth_read_shadow',`
########################################
## <summary>
+## Map the shadow passwords file (/etc/shadow)
+## </summary>
+## <param name="domain">
+## <summary>
+## Domain allowed access.
+## </summary>
+## </param>
+#
+interface(`auth_map_shadow',`
+ gen_require(`
+ type shadow_t;
+ ')
+ allow $1 shadow_t:file map;
+')
+
+########################################
+## <summary>
## Pass shadow assertion for reading.
## </summary>
## <desc>
