Kconfig

  1# SPDX-License-Identifier: GPL-2.0-only
  2config SECURITY_SELINUX
  3	bool "SELinux Support"
  4	depends on SECURITY_NETWORK && AUDIT && NET && INET
  5	select NETWORK_SECMARK
  6	default n
  7	help
  8	  This selects Security-Enhanced Linux (SELinux).
  9	  You will also need a policy configuration and a labeled filesystem.
 10	  If you are unsure how to answer this question, answer N.
 11
 12config SECURITY_SELINUX_BOOTPARAM
 13	bool "SELinux boot parameter"
 14	depends on SECURITY_SELINUX
 15	default n
 16	help
 17	  This option adds a kernel parameter 'selinux', which allows SELinux
 18	  to be disabled at boot.  If this option is selected, SELinux
 19	  functionality can be disabled with selinux=0 on the kernel
 20	  command line.  The purpose of this option is to allow a single
 21	  kernel image to be distributed with SELinux built in, but not
 22	  necessarily enabled.
 23
 24	  If you are unsure how to answer this question, answer N.
 25
 26config SECURITY_SELINUX_DEVELOP
 27	bool "SELinux Development Support"
 28	depends on SECURITY_SELINUX
 29	default y
 30	help
 31	  This enables the development support option of SELinux,
 32	  which is useful for experimenting with SELinux and developing
 33	  policies.  If unsure, say Y.  With this option enabled, the
 34	  kernel will start in permissive mode (log everything, deny nothing)
 35	  unless you specify enforcing=1 on the kernel command line.  You
 36	  can interactively toggle the kernel between enforcing mode and
 37	  permissive mode (if permitted by the policy) via
 38	  /sys/fs/selinux/enforce.
 39
 40config SECURITY_SELINUX_AVC_STATS
 41	bool "SELinux AVC Statistics"
 42	depends on SECURITY_SELINUX
 43	default y
 44	help
 45	  This option collects access vector cache statistics to
 46	  /sys/fs/selinux/avc/cache_stats, which may be monitored via
 47	  tools such as avcstat.
 48
 49config SECURITY_SELINUX_SIDTAB_HASH_BITS
 50	int "SELinux sidtab hashtable size"
 51	depends on SECURITY_SELINUX
 52	range 8 13
 53	default 9
 54	help
 55	  This option sets the number of buckets used in the sidtab hashtable
 56	  to 2^SECURITY_SELINUX_SIDTAB_HASH_BITS buckets. The number of hash
 57	  collisions may be viewed at /sys/fs/selinux/ss/sidtab_hash_stats. If
 58	  chain lengths are high (e.g. > 20) then selecting a higher value here
 59	  will ensure that lookups times are short and stable.
 60
 61config SECURITY_SELINUX_SID2STR_CACHE_SIZE
 62	int "SELinux SID to context string translation cache size"
 63	depends on SECURITY_SELINUX
 64	default 256
 65	help
 66	  This option defines the size of the internal SID -> context string
 67	  cache, which improves the performance of context to string
 68	  conversion.  Setting this option to 0 disables the cache completely.
 69
 70	  If unsure, keep the default value.
 71
 72config SECURITY_SELINUX_AVC_HASH_BITS
 73	int "SELinux avc hashtable size"
 74	depends on SECURITY_SELINUX
 75	range 9 14
 76	default 9
 77	help
 78	  This option sets the number of buckets used in the AVC hash table
 79	  to 2^SECURITY_SELINUX_AVC_HASH_BITS. A higher value helps maintain
 80	  shorter chain lengths especially when expanding AVC nodes via
 81	  /sys/fs/selinux/avc/cache_threshold.
 82
 83config SECURITY_SELINUX_DEBUG
 84	bool "SELinux kernel debugging support"
 85	depends on SECURITY_SELINUX
 86	default n
 87	help
 88	  This enables debugging code designed to help SELinux kernel
 89	  developers, unless you know what this does in the kernel code you
 90	  should leave this disabled.
 91
 92	  To fine control the messages to be printed enable
 93	  CONFIG_DYNAMIC_DEBUG and see
 94	  Documentation/admin-guide/dynamic-debug-howto.rst for additional
 95	  information.
 96
 97	  Example usage:
 98
 99		echo -n 'file "security/selinux/*" +p' > \
100			/proc/dynamic_debug/control